Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/WebGLRenderingContext.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/html/canvas/WebGLRenderingContext.h"
 
-#include "RuntimeEnabledFeatures.h"
-#include "bindings/v8/ExceptionMessages.h"
-#include "bindings/v8/ExceptionState.h"
-#include "core/dom/ExceptionCode.h"
-#include "core/fetch/ImageResource.h"
-#include "core/html/HTMLCanvasElement.h"
-#include "core/html/HTMLImageElement.h"
-#include "core/html/HTMLVideoElement.h"
-#include "core/html/ImageData.h"
+#include "core/frame/Frame.h"
 #include "core/html/canvas/ANGLEInstancedArrays.h"
 #include "core/html/canvas/EXTFragDepth.h"
 #include "core/html/canvas/EXTTextureFilterAnisotropic.h"
 #include "core/html/canvas/OESElementIndexUint.h"
 #include "core/html/canvas/OESStandardDerivatives.h"
 #include "core/html/canvas/OESTextureFloat.h"
 #include "core/html/canvas/OESTextureFloatLinear.h"
 #include "core/html/canvas/OESTextureHalfFloat.h"
 #include "core/html/canvas/OESTextureHalfFloatLinear.h"
 #include "core/html/canvas/OESVertexArrayObject.h"
-#include "core/html/canvas/WebGLActiveInfo.h"
-#include "core/html/canvas/WebGLBuffer.h"
 #include "core/html/canvas/WebGLCompressedTextureATC.h"
 #include "core/html/canvas/WebGLCompressedTexturePVRTC.h"
 #include "core/html/canvas/WebGLCompressedTextureS3TC.h"
 #include "core/html/canvas/WebGLContextAttributes.h"
 #include "core/html/canvas/WebGLContextEvent.h"
-#include "core/html/canvas/WebGLContextGroup.h"
 #include "core/html/canvas/WebGLDebugRendererInfo.h"
 #include "core/html/canvas/WebGLDebugShaders.h"
 #include "core/html/canvas/WebGLDepthTexture.h"
 #include "core/html/canvas/WebGLDrawBuffers.h"
-#include "core/html/canvas/WebGLFramebuffer.h"
 #include "core/html/canvas/WebGLLoseContext.h"
-#include "core/html/canvas/WebGLProgram.h"
-#include "core/html/canvas/WebGLRenderbuffer.h"
-#include "core/html/canvas/WebGLShader.h"
-#include "core/html/canvas/WebGLShaderPrecisionFormat.h"
-#include "core/html/canvas/WebGLTexture.h"
-#include "core/html/canvas/WebGLUniformLocation.h"
-#include "core/inspector/InspectorInstrumentation.h"
 #include "core/loader/FrameLoader.h"
 #include "core/loader/FrameLoaderClient.h"
-#include "core/frame/Frame.h"
 #include "core/frame/Settings.h"
 #include "core/rendering/RenderBox.h"
 #include "platform/CheckedInt.h"
 #include "platform/NotImplemented.h"
-#include "platform/geometry/IntSize.h"
-#include "platform/graphics/UnacceleratedImageBufferSurface.h"
 #include "platform/graphics/gpu/DrawingBuffer.h"
 #include "public/platform/Platform.h"
 
-#include "wtf/PassOwnPtr.h"
-#include "wtf/Uint32Array.h"
-#include "wtf/text/StringBuilder.h"
-
 namespace WebCore {
 
-const double secondsBetweenRestoreAttempts = 1.0;
-const int maxGLErrorsAllowedToConsole = 256;
-const unsigned maxGLActiveContexts = 16;
-
-Vector<WebGLRenderingContext*>& WebGLRenderingContext::activeContexts()
-{
-    DEFINE_STATIC_LOCAL(Vector<WebGLRenderingContext*>, activeContexts, ());
-    return activeContexts;
-}
-
-Vector<WebGLRenderingContext*>& WebGLRenderingContext::forciblyEvictedContexts()
-{
-    DEFINE_STATIC_LOCAL(Vector<WebGLRenderingContext*>, forciblyEvictedContexts, ());
-    return forciblyEvictedContexts;
-}
-
-void WebGLRenderingContext::forciblyLoseOldestContext(const String& reason)
-{
-    size_t candidateID = oldestContextIndex();
-    if (candidateID >= activeContexts().size())
-        return;
-
-    WebGLRenderingContext* candidate = activeContexts()[candidateID];
-
-    activeContexts().remove(candidateID);
-
-    candidate->printWarningToConsole(reason);
-    InspectorInstrumentation::didFireWebGLWarning(candidate->canvas());
-
-    // This will call deactivateContext once the context has actually been lost.
-    candidate->forceLostContext(WebGLRenderingContext::SyntheticLostContext);
-}
-
-size_t WebGLRenderingContext::oldestContextIndex()
-{
-    if (!activeContexts().size())
-        return maxGLActiveContexts;
-
-    WebGLRenderingContext* candidate = activeContexts().first();
-    size_t candidateID = 0;
-    for (size_t ii = 1; ii < activeContexts().size(); ++ii) {
-        WebGLRenderingContext* context = activeContexts()[ii];
-        if (context->webGraphicsContext3D() && candidate->webGraphicsContext3D() && context->webGraphicsContext3D()->lastFlushID() < candidate->webGraphicsContext3D()->lastFlushID()) {
-            candidate = context;
-            candidateID = ii;
-        }
-    }
-
-    return candidateID;
-}
-
-IntSize WebGLRenderingContext::oldestContextSize()
-{
-    IntSize size;
-
-    size_t candidateID = oldestContextIndex();
-    if (candidateID < activeContexts().size()) {
-        WebGLRenderingContext* candidate = activeContexts()[candidateID];
-        size.setWidth(candidate->drawingBufferWidth());
-        size.setHeight(candidate->drawingBufferHeight());
-    }
-
-    return size;
-}
-
-void WebGLRenderingContext::activateContext(WebGLRenderingContext* context)
-{
-    unsigned removedContexts = 0;
-    while (activeContexts().size() >= maxGLActiveContexts && removedContexts < maxGLActiveContexts) {
-        forciblyLoseOldestContext("WARNING: Too many active WebGL contexts. Oldest context will be lost.");
-        removedContexts++;
-    }
-
-    if (!activeContexts().contains(context))
-        activeContexts().append(context);
-}
-
-void WebGLRenderingContext::deactivateContext(WebGLRenderingContext* context, bool addToEvictedList)
-{
-    size_t position = activeContexts().find(context);
-    if (position != WTF::kNotFound)
-        activeContexts().remove(position);
-
-    if (addToEvictedList && !forciblyEvictedContexts().contains(context))
-        forciblyEvictedContexts().append(context);
-}
-
-void WebGLRenderingContext::willDestroyContext(WebGLRenderingContext* context)
-{
-    size_t position = forciblyEvictedContexts().find(context);
-    if (position != WTF::kNotFound)
-        forciblyEvictedContexts().remove(position);
-
-    deactivateContext(context, false);
-
-    // Try to re-enable the oldest inactive contexts.
-    while(activeContexts().size() < maxGLActiveContexts && forciblyEvictedContexts().size()) {
-        WebGLRenderingContext* evictedContext = forciblyEvictedContexts().first();
-        if (!evictedContext->m_restoreAllowed) {
-            forciblyEvictedContexts().remove(0);
-            continue;
-        }
-
-        IntSize desiredSize = evictedContext->m_drawingBuffer->adjustSize(evictedContext->clampedCanvasSize());
-
-        // If there's room in the pixel budget for this context, restore it.
-        if (!desiredSize.isEmpty()) {
-            forciblyEvictedContexts().remove(0);
-            evictedContext->forceRestoreContext();
-            activeContexts().append(evictedContext);
-        }
-        break;
-    }
-}
-
-class WebGLRenderingContextEvictionManager : public ContextEvictionManager {
-public:
-    void forciblyLoseOldestContext(const String& reason) {
-        WebGLRenderingContext::forciblyLoseOldestContext(reason);
-    };
-    IntSize oldestContextSize() {
-        return WebGLRenderingContext::oldestContextSize();
-    };
-};
-
-namespace {
-
-    class ScopedDrawingBufferBinder {
-    public:
-        ScopedDrawingBufferBinder(DrawingBuffer* drawingBuffer, WebGLFramebuffer* framebufferBinding)
-            : m_drawingBuffer(drawingBuffer)
-            , m_framebufferBinding(framebufferBinding)
-        {
-            // Commit DrawingBuffer if needed (e.g., for multisampling)
-            if (!m_framebufferBinding && m_drawingBuffer)
-                m_drawingBuffer->commit();
-        }
-
-        ~ScopedDrawingBufferBinder()
-        {
-            // Restore DrawingBuffer if needed
-            if (!m_framebufferBinding && m_drawingBuffer)
-                m_drawingBuffer->bind();
-        }
-
-    private:
-        DrawingBuffer* m_drawingBuffer;
-        WebGLFramebuffer* m_framebufferBinding;
-    };
-
-    Platform3DObject objectOrZero(WebGLObject* object)
-    {
-        return object ? object->object() : 0;
-    }
-
-    GLint clamp(GLint value, GLint min, GLint max)
-    {
-        if (value < min)
-            value = min;
-        if (value > max)
-            value = max;
-        return value;
-    }
-
-    // Return true if a character belongs to the ASCII subset as defined in
-    // GLSL ES 1.0 spec section 3.1.
-    bool validateCharacter(unsigned char c)
-    {
-        // Printing characters are valid except " $ ` @ \ ' DEL.
-        if (c >= 32 && c <= 126
-            && c != '"' && c != '$' && c != '`' && c != '@' && c != '\\' && c != '\'')
-            return true;
-        // Horizontal tab, line feed, vertical tab, form feed, carriage return
-        // are also valid.
-        if (c >= 9 && c <= 13)
-            return true;
-        return false;
-    }
-
-    bool isPrefixReserved(const String& name)
-    {
-        if (name.startsWith("gl_") || name.startsWith("webgl_") || name.startsWith("_webgl_"))
-            return true;
-        return false;
-    }
-
-    // Strips comments from shader text. This allows non-ASCII characters
-    // to be used in comments without potentially breaking OpenGL
-    // implementations not expecting characters outside the GLSL ES set.
-    class StripComments {
-    public:
-        StripComments(const String& str)
-            : m_parseState(BeginningOfLine)
-            , m_sourceString(str)
-            , m_length(str.length())
-            , m_position(0)
-        {
-            parse();
-        }
-
-        String result()
-        {
-            return m_builder.toString();
-        }
-
-    private:
-        bool hasMoreCharacters() const
-        {
-            return (m_position < m_length);
-        }
-
-        void parse()
-        {
-            while (hasMoreCharacters()) {
-                process(current());
-                // process() might advance the position.
-                if (hasMoreCharacters())
-                    advance();
-            }
-        }
-
-        void process(UChar);
-
-        bool peek(UChar& character) const
-        {
-            if (m_position + 1 >= m_length)
-                return false;
-            character = m_sourceString[m_position + 1];
-            return true;
-        }
-
-        UChar current()
-        {
-            ASSERT_WITH_SECURITY_IMPLICATION(m_position < m_length);
-            return m_sourceString[m_position];
-        }
-
-        void advance()
-        {
-            ++m_position;
-        }
-
-        static bool isNewline(UChar character)
-        {
-            // Don't attempt to canonicalize newline related characters.
-            return (character == '\n' || character == '\r');
-        }
-
-        void emit(UChar character)
-        {
-            m_builder.append(character);
-        }
-
-        enum ParseState {
-            // Have not seen an ASCII non-whitespace character yet on
-            // this line. Possible that we might see a preprocessor
-            // directive.
-            BeginningOfLine,
-
-            // Have seen at least one ASCII non-whitespace character
-            // on this line.
-            MiddleOfLine,
-
-            // Handling a preprocessor directive. Passes through all
-            // characters up to the end of the line. Disables comment
-            // processing.
-            InPreprocessorDirective,
-
-            // Handling a single-line comment. The comment text is
-            // replaced with a single space.
-            InSingleLineComment,
-
-            // Handling a multi-line comment. Newlines are passed
-            // through to preserve line numbers.
-            InMultiLineComment
-        };
-
-        ParseState m_parseState;
-        String m_sourceString;
-        unsigned m_length;
-        unsigned m_position;
-        StringBuilder m_builder;
-    };
-
-    void StripComments::process(UChar c)
-    {
-        if (isNewline(c)) {
-            // No matter what state we are in, pass through newlines
-            // so we preserve line numbers.
-            emit(c);
-
-            if (m_parseState != InMultiLineComment)
-                m_parseState = BeginningOfLine;
-
-            return;
-        }
-
-        UChar temp = 0;
-        switch (m_parseState) {
-        case BeginningOfLine:
-            if (WTF::isASCIISpace(c)) {
-                emit(c);
-                break;
-            }
-
-            if (c == '#') {
-                m_parseState = InPreprocessorDirective;
-                emit(c);
-                break;
-            }
-
-            // Transition to normal state and re-handle character.
-            m_parseState = MiddleOfLine;
-            process(c);
-            break;
-
-        case MiddleOfLine:
-            if (c == '/' && peek(temp)) {
-                if (temp == '/') {
-                    m_parseState = InSingleLineComment;
-                    emit(' ');
-                    advance();
-                    break;
-                }
-
-                if (temp == '*') {
-                    m_parseState = InMultiLineComment;
-                    // Emit the comment start in case the user has
-                    // an unclosed comment and we want to later
-                    // signal an error.
-                    emit('/');
-                    emit('*');
-                    advance();
-                    break;
-                }
-            }
-
-            emit(c);
-            break;
-
-        case InPreprocessorDirective:
-            // No matter what the character is, just pass it
-            // through. Do not parse comments in this state. This
-            // might not be the right thing to do long term, but it
-            // should handle the #error preprocessor directive.
-            emit(c);
-            break;
-
-        case InSingleLineComment:
-            // The newline code at the top of this function takes care
-            // of resetting our state when we get out of the
-            // single-line comment. Swallow all other characters.
-            break;
-
-        case InMultiLineComment:
-            if (c == '*' && peek(temp) && temp == '/') {
-                emit('*');
-                emit('/');
-                m_parseState = MiddleOfLine;
-                advance();
-                break;
-            }
-
-            // Swallow all other characters. Unclear whether we may
-            // want or need to just emit a space per character to try
-            // to preserve column numbers for debugging purposes.
-            break;
-        }
-    }
-} // namespace anonymous
-
-class WebGLRenderingContextLostCallback : public blink::WebGraphicsContext3D::WebGraphicsContextLostCallback {
-    WTF_MAKE_FAST_ALLOCATED;
-public:
-    explicit WebGLRenderingContextLostCallback(WebGLRenderingContext* cb) : m_context(cb) { }
-    virtual void onContextLost() { m_context->forceLostContext(WebGLRenderingContext::RealLostContext); }
-    virtual ~WebGLRenderingContextLostCallback() {}
-private:
-    WebGLRenderingContext* m_context;
-};
-
-class WebGLRenderingContextErrorMessageCallback : public blink::WebGraphicsContext3D::WebGraphicsErrorMessageCallback {
-    WTF_MAKE_FAST_ALLOCATED;
-public:
-    explicit WebGLRenderingContextErrorMessageCallback(WebGLRenderingContext* cb) : m_context(cb) { }
-    virtual void onErrorMessage(const blink::WebString& message, blink::WGC3Dint)
-    {
-        if (m_context->m_synthesizedErrorsToConsole)
-            m_context->printGLErrorToConsole(message);
-        InspectorInstrumentation::didFireWebGLErrorOrWarning(m_context->canvas(), message);
-    }
-    virtual ~WebGLRenderingContextErrorMessageCallback() { }
-private:
-    WebGLRenderingContext* m_context;
-};
-
 PassOwnPtr<WebGLRenderingContext> WebGLRenderingContext::create(HTMLCanvasElement* canvas, WebGLContextAttributes* attrs)
 {
     Document& document = canvas->document();
     Frame* frame = document.frame();
     if (!frame)
         return nullptr;
     Settings* settings = frame->settings();
 
     // The FrameLoaderClient might block creation of a new WebGL context despite the page settings; in
     // particular, if WebGL contexts were lost one or more times via the GL_ARB_robustness extension.
@@ skipping 13 matching lines @@
     if (!context || !context->makeContextCurrent()) {
         canvas->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextcreationerror, false, true, "Could not create a WebGL context."));
         return nullptr;
     }
 
     Extensions3DUtil extensionsUtil(context.get());
     if (extensionsUtil.supportsExtension("GL_EXT_debug_marker"))
         context->pushGroupMarkerEXT("WebGLRenderingContext");
 
     OwnPtr<WebGLRenderingContext> renderingContext = adoptPtr(new WebGLRenderingContext(canvas, context.release(), attrs));
+    renderingContext->registerContextExtensions();
     renderingContext->suspendIfNeeded();
 
     if (renderingContext->m_drawingBuffer->isZeroSized()) {
         canvas->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextcreationerror, false, true, "Could not create a WebGL context."));
         return nullptr;
     }
 
     return renderingContext.release();
 }
 
 WebGLRenderingContext::WebGLRenderingContext(HTMLCanvasElement* passedCanvas, PassOwnPtr<blink::WebGraphicsContext3D> context, WebGLContextAttributes* requestedAttributes)
-    : CanvasRenderingContext(passedCanvas)
-    , ActiveDOMObject(&passedCanvas->document())
-    , m_context(context)
-    , m_drawingBuffer(0)
-    , m_dispatchContextLostEventTimer(this, &WebGLRenderingContext::dispatchContextLostEvent)
-    , m_restoreAllowed(false)
-    , m_restoreTimer(this, &WebGLRenderingContext::maybeRestoreContext)
-    , m_generatedImageCache(4)
-    , m_contextLost(false)
-    , m_contextLostMode(SyntheticLostContext)
-    , m_requestedAttributes(requestedAttributes->clone())
-    , m_synthesizedErrorsToConsole(true)
-    , m_numGLErrorsToConsoleAllowed(maxGLErrorsAllowedToConsole)
-    , m_multisamplingAllowed(false)
-    , m_multisamplingObserverRegistered(false)
-    , m_onePlusMaxEnabledAttribIndex(0)
-    , m_onePlusMaxNonDefaultTextureUnit(0)
+    : WebGLRenderingContextBase(passedCanvas, context, requestedAttributes)
 {
-    ASSERT(m_context);
     ScriptWrappable::init(this);
+}
 
-    m_contextGroup = WebGLContextGroup::create();
-    m_contextGroup->addContext(this);
+WebGLRenderingContext::~WebGLRenderingContext()
+{
 
-    m_maxViewportDims[0] = m_maxViewportDims[1] = 0;
-    m_context->getIntegerv(GL_MAX_VIEWPORT_DIMS, m_maxViewportDims);
+}
 
-    RefPtr<WebGLRenderingContextEvictionManager> contextEvictionManager = adoptRef(new WebGLRenderingContextEvictionManager());
-
-    // Create the DrawingBuffer and initialize the platform layer.
-    DrawingBuffer::PreserveDrawingBuffer preserve = requestedAttributes->preserveDrawingBuffer() ? DrawingBuffer::Preserve : DrawingBuffer::Discard;
-    m_drawingBuffer = DrawingBuffer::create(m_context.get(), clampedCanvasSize(), preserve, contextEvictionManager.release());
-
-    if (!m_drawingBuffer->isZeroSized()) {
-        m_drawingBuffer->bind();
-        setupFlags();
-        initializeNewContext();
-    }
-
+void WebGLRenderingContext::registerContextExtensions()
+{
     // Register extensions.
     static const char* const webkitPrefix[] = { "WEBKIT_", 0, };
     static const char* const bothPrefixes[] = { "", "WEBKIT_", 0, };
 
     registerExtension<ANGLEInstancedArrays>(m_angleInstancedArrays);
     registerExtension<EXTTextureFilterAnisotropic>(m_extTextureFilterAnisotropic, PrefixedExtension, webkitPrefix);
     registerExtension<OESElementIndexUint>(m_oesElementIndexUint);
     registerExtension<OESStandardDerivatives>(m_oesStandardDerivatives);
     registerExtension<OESTextureFloat>(m_oesTextureFloat);
     registerExtension<OESTextureFloatLinear>(m_oesTextureFloatLinear);
     registerExtension<OESTextureHalfFloat>(m_oesTextureHalfFloat);
     registerExtension<OESTextureHalfFloatLinear>(m_oesTextureHalfFloatLinear);
     registerExtension<OESVertexArrayObject>(m_oesVertexArrayObject);
     registerExtension<WebGLCompressedTextureATC>(m_webglCompressedTextureATC, PrefixedExtension, webkitPrefix);
     registerExtension<WebGLCompressedTexturePVRTC>(m_webglCompressedTexturePVRTC, PrefixedExtension, webkitPrefix);
     registerExtension<WebGLCompressedTextureS3TC>(m_webglCompressedTextureS3TC, PrefixedExtension, bothPrefixes);
     registerExtension<WebGLDepthTexture>(m_webglDepthTexture, PrefixedExtension, bothPrefixes);
     registerExtension<WebGLDrawBuffers>(m_webglDrawBuffers);
     registerExtension<WebGLLoseContext>(m_webglLoseContext, ApprovedExtension, bothPrefixes);
 
     // Register draft extensions.
     registerExtension<EXTFragDepth>(m_extFragDepth, DraftExtension);
 
     // Register privileged extensions.
     registerExtension<WebGLDebugRendererInfo>(m_webglDebugRendererInfo, WebGLDebugRendererInfoExtension);
     registerExtension<WebGLDebugShaders>(m_webglDebugShaders, PrivilegedExtension);
 }
 
-void WebGLRenderingContext::initializeNewContext()
-{
-    ASSERT(!isContextLost());
-    m_needsUpdate = true;
-    m_markedCanvasDirty = false;
-    m_activeTextureUnit = 0;
-    m_packAlignment = 4;
-    m_unpackAlignment = 4;
-    m_unpackFlipY = false;
-    m_unpackPremultiplyAlpha = false;
-    m_unpackColorspaceConversion = GC3D_BROWSER_DEFAULT_WEBGL;
-    m_boundArrayBuffer = 0;
-    m_currentProgram = 0;
-    m_framebufferBinding = 0;
-    m_renderbufferBinding = 0;
-    m_depthMask = true;
-    m_stencilEnabled = false;
-    m_stencilMask = 0xFFFFFFFF;
-    m_stencilMaskBack = 0xFFFFFFFF;
-    m_stencilFuncRef = 0;
-    m_stencilFuncRefBack = 0;
-    m_stencilFuncMask = 0xFFFFFFFF;
-    m_stencilFuncMaskBack = 0xFFFFFFFF;
-    m_layerCleared = false;
-    m_numGLErrorsToConsoleAllowed = maxGLErrorsAllowedToConsole;
-
-    m_clearColor[0] = m_clearColor[1] = m_clearColor[2] = m_clearColor[3] = 0;
-    m_scissorEnabled = false;
-    m_clearDepth = 1;
-    m_clearStencil = 0;
-    m_colorMask[0] = m_colorMask[1] = m_colorMask[2] = m_colorMask[3] = true;
-
-    GLint numCombinedTextureImageUnits = 0;
-    m_context->getIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &numCombinedTextureImageUnits);
-    m_textureUnits.clear();
-    m_textureUnits.resize(numCombinedTextureImageUnits);
-
-    GLint numVertexAttribs = 0;
-    m_context->getIntegerv(GL_MAX_VERTEX_ATTRIBS, &numVertexAttribs);
-    m_maxVertexAttribs = numVertexAttribs;
-
-    m_maxTextureSize = 0;
-    m_context->getIntegerv(GL_MAX_TEXTURE_SIZE, &m_maxTextureSize);
-    m_maxTextureLevel = WebGLTexture::computeLevelCount(m_maxTextureSize, m_maxTextureSize);
-    m_maxCubeMapTextureSize = 0;
-    m_context->getIntegerv(GL_MAX_CUBE_MAP_TEXTURE_SIZE, &m_maxCubeMapTextureSize);
-    m_maxCubeMapTextureLevel = WebGLTexture::computeLevelCount(m_maxCubeMapTextureSize, m_maxCubeMapTextureSize);
-    m_maxRenderbufferSize = 0;
-    m_context->getIntegerv(GL_MAX_RENDERBUFFER_SIZE, &m_maxRenderbufferSize);
-
-    // These two values from EXT_draw_buffers are lazily queried.
-    m_maxDrawBuffers = 0;
-    m_maxColorAttachments = 0;
-
-    m_backDrawBuffer = GL_BACK;
-
-    m_defaultVertexArrayObject = WebGLVertexArrayObjectOES::create(this, WebGLVertexArrayObjectOES::VaoTypeDefault);
-    addContextObject(m_defaultVertexArrayObject.get());
-    m_boundVertexArrayObject = m_defaultVertexArrayObject;
-
-    m_vertexAttribValue.resize(m_maxVertexAttribs);
-
-    createFallbackBlackTextures1x1();
-
-    IntSize canvasSize = clampedCanvasSize();
-    m_drawingBuffer->reset(canvasSize);
-
-    m_context->viewport(0, 0, canvasSize.width(), canvasSize.height());
-    m_context->scissor(0, 0, canvasSize.width(), canvasSize.height());
-
-    m_contextLostCallbackAdapter = adoptPtr(new WebGLRenderingContextLostCallback(this));
-    m_errorMessageCallbackAdapter = adoptPtr(new WebGLRenderingContextErrorMessageCallback(this));
-
-    m_context->setContextLostCallback(m_contextLostCallbackAdapter.get());
-    m_context->setErrorMessageCallback(m_errorMessageCallbackAdapter.get());
-
-    // This ensures that the context has a valid "lastFlushID" and won't be mistakenly identified as the "least recently used" context.
-    m_context->flush();
-
-    activateContext(this);
-}
-
-void WebGLRenderingContext::setupFlags()
-{
-    ASSERT(m_context);
-    if (Page* p = canvas()->document().page()) {
-        m_synthesizedErrorsToConsole = p->settings().webGLErrorsToConsoleEnabled();
-
-        if (!m_multisamplingObserverRegistered && m_requestedAttributes->antialias()) {
-            m_multisamplingAllowed = m_drawingBuffer->multisample();
-            p->addMultisamplingChangedObserver(this);
-            m_multisamplingObserverRegistered = true;
-        }
-    }
-
-    m_isGLES2NPOTStrict = !extensionsUtil()->isExtensionEnabled("GL_OES_texture_npot");
-    m_isDepthStencilSupported = extensionsUtil()->isExtensionEnabled("GL_OES_packed_depth_stencil");
-}
-
-bool WebGLRenderingContext::allowPrivilegedExtensions() const
-{
-    if (Page* p = canvas()->document().page())
-        return p->settings().privilegedWebGLExtensionsEnabled();
-    return false;
-}
-
-bool WebGLRenderingContext::allowWebGLDebugRendererInfo() const
-{
-    return true;
-}
-
-void WebGLRenderingContext::addCompressedTextureFormat(GLenum format)
-{
-    if (!m_compressedTextureFormats.contains(format))
-        m_compressedTextureFormats.append(format);
-}
-
-void WebGLRenderingContext::removeAllCompressedTextureFormats()
-{
-    m_compressedTextureFormats.clear();
-}
-
-WebGLRenderingContext::~WebGLRenderingContext()
-{
-    // Remove all references to WebGLObjects so if they are the last reference
-    // they will be freed before the last context is removed from the context group.
-    m_boundArrayBuffer = 0;
-    m_defaultVertexArrayObject = 0;
-    m_boundVertexArrayObject = 0;
-    m_vertexAttrib0Buffer = 0;
-    m_currentProgram = 0;
-    m_framebufferBinding = 0;
-    m_renderbufferBinding = 0;
-
-    for (size_t i = 0; i < m_textureUnits.size(); ++i) {
-      m_textureUnits[i].m_texture2DBinding = 0;
-      m_textureUnits[i].m_textureCubeMapBinding = 0;
-    }
-
-    m_blackTexture2D = 0;
-    m_blackTextureCubeMap = 0;
-
-    detachAndRemoveAllObjects();
-
-    // release all extensions
-    for (size_t i = 0; i < m_extensions.size(); ++i)
-        delete m_extensions[i];
-
-    // Context must be removed from the group prior to the destruction of the
-    // WebGraphicsContext3D, otherwise shared objects may not be properly deleted.
-    m_contextGroup->removeContext(this);
-
-    destroyContext();
-
-    if (m_multisamplingObserverRegistered) {
-        Page* page = canvas()->document().page();
-        if (page)
-            page->removeMultisamplingChangedObserver(this);
-    }
-
-    willDestroyContext(this);
-}
-
-void WebGLRenderingContext::destroyContext()
-{
-    m_contextLost = true;
-
-    // The drawing buffer holds a context reference. It must also be destroyed
-    // in order for the context to be released.
-    m_drawingBuffer->releaseResources();
-
-    m_extensionsUtil.clear();
-
-    if (m_context) {
-        m_context->setContextLostCallback(0);
-        m_context->setErrorMessageCallback(0);
-        m_context.clear();
-    }
-}
-
-void WebGLRenderingContext::markContextChanged()
-{
-    if (m_framebufferBinding || isContextLost())
-        return;
-
-    m_drawingBuffer->markContentsChanged();
-
-    m_layerCleared = false;
-    RenderBox* renderBox = canvas()->renderBox();
-    if (renderBox && renderBox->hasAcceleratedCompositing()) {
-        m_markedCanvasDirty = true;
-        canvas()->clearCopiedImage();
-        renderBox->contentChanged(CanvasChanged);
-    } else {
-        if (!m_markedCanvasDirty) {
-            m_markedCanvasDirty = true;
-            canvas()->didDraw(FloatRect(FloatPoint(0, 0), clampedCanvasSize()));
-        }
-    }
-}
-
-bool WebGLRenderingContext::clearIfComposited(GLbitfield mask)
-{
-    if (isContextLost())
-        return false;
-
-    if (!m_drawingBuffer->layerComposited() || m_layerCleared
-        || m_requestedAttributes->preserveDrawingBuffer() || (mask && m_framebufferBinding))
-        return false;
-
-    RefPtr<WebGLContextAttributes> contextAttributes = getContextAttributes();
-
-    // Determine if it's possible to combine the clear the user asked for and this clear.
-    bool combinedClear = mask && !m_scissorEnabled;
-
-    m_context->disable(GL_SCISSOR_TEST);
-    if (combinedClear && (mask & GL_COLOR_BUFFER_BIT))
-        m_context->clearColor(m_colorMask[0] ? m_clearColor[0] : 0,
-                              m_colorMask[1] ? m_clearColor[1] : 0,
-                              m_colorMask[2] ? m_clearColor[2] : 0,
-                              m_colorMask[3] ? m_clearColor[3] : 0);
-    else
-        m_context->clearColor(0, 0, 0, 0);
-    m_context->colorMask(true, true, true, true);
-    GLbitfield clearMask = GL_COLOR_BUFFER_BIT;
-    if (contextAttributes->depth()) {
-        if (!combinedClear || !m_depthMask || !(mask & GL_DEPTH_BUFFER_BIT))
-            m_context->clearDepth(1.0f);
-        clearMask |= GL_DEPTH_BUFFER_BIT;
-        m_context->depthMask(true);
-    }
-    if (contextAttributes->stencil()) {
-        if (combinedClear && (mask & GL_STENCIL_BUFFER_BIT))
-            m_context->clearStencil(m_clearStencil & m_stencilMask);
-        else
-            m_context->clearStencil(0);
-        clearMask |= GL_STENCIL_BUFFER_BIT;
-        m_context->stencilMaskSeparate(GL_FRONT, 0xFFFFFFFF);
-    }
-
-    m_drawingBuffer->clearFramebuffers(clearMask);
-
-    restoreStateAfterClear();
-    if (m_framebufferBinding)
-        m_context->bindFramebuffer(GL_FRAMEBUFFER, objectOrZero(m_framebufferBinding.get()));
-    m_layerCleared = true;
-
-    return combinedClear;
-}
-
-void WebGLRenderingContext::restoreStateAfterClear()
-{
-    if (isContextLost())
-        return;
-
-    // Restore the state that the context set.
-    if (m_scissorEnabled)
-        m_context->enable(GL_SCISSOR_TEST);
-    m_context->clearColor(m_clearColor[0], m_clearColor[1],
-                          m_clearColor[2], m_clearColor[3]);
-    m_context->colorMask(m_colorMask[0], m_colorMask[1],
-                         m_colorMask[2], m_colorMask[3]);
-    m_context->clearDepth(m_clearDepth);
-    m_context->clearStencil(m_clearStencil);
-    m_context->stencilMaskSeparate(GL_FRONT, m_stencilMask);
-    m_context->depthMask(m_depthMask);
-}
-
-void WebGLRenderingContext::markLayerComposited()
-{
-    if (!isContextLost())
-        m_drawingBuffer->markLayerComposited();
-}
-
-void WebGLRenderingContext::paintRenderingResultsToCanvas()
-{
-    if (isContextLost()) {
-        canvas()->clearPresentationCopy();
-        return;
-    }
-
-    if (canvas()->document().printing())
-        canvas()->clearPresentationCopy();
-
-    // Until the canvas is written to by the application, the clear that
-    // happened after it was composited should be ignored by the compositor.
-    if (m_drawingBuffer->layerComposited() && !m_requestedAttributes->preserveDrawingBuffer()) {
-        m_drawingBuffer->paintCompositedResultsToCanvas(canvas()->buffer());
-
-        canvas()->makePresentationCopy();
-    } else
-        canvas()->clearPresentationCopy();
-    clearIfComposited();
-
-    if (!m_markedCanvasDirty && !m_layerCleared)
-        return;
-
-    canvas()->clearCopiedImage();
-    m_markedCanvasDirty = false;
-
-    m_drawingBuffer->commit();
-    if (!(canvas()->buffer())->copyRenderingResultsFromDrawingBuffer(m_drawingBuffer.get())) {
-        canvas()->ensureUnacceleratedImageBuffer();
-        if (canvas()->hasImageBuffer())
-            m_drawingBuffer->paintRenderingResultsToCanvas(canvas()->buffer());
-    }
-
-    if (m_framebufferBinding)
-        m_context->bindFramebuffer(GL_FRAMEBUFFER, objectOrZero(m_framebufferBinding.get()));
-    else
-        m_drawingBuffer->bind();
-}
-
-PassRefPtr<ImageData> WebGLRenderingContext::paintRenderingResultsToImageData()
-{
-    if (isContextLost())
-        return 0;
-
-    clearIfComposited();
-    m_drawingBuffer->commit();
-    int width, height;
-    RefPtr<Uint8ClampedArray> imageDataPixels = m_drawingBuffer->paintRenderingResultsToImageData(width, height);
-    if (!imageDataPixels)
-        return 0;
-
-    if (m_framebufferBinding)
-        m_context->bindFramebuffer(GL_FRAMEBUFFER, objectOrZero(m_framebufferBinding.get()));
-    else
-        m_drawingBuffer->bind();
-
-    return ImageData::create(IntSize(width, height), imageDataPixels);
-}
-
-void WebGLRenderingContext::reshape(int width, int height)
-{
-    if (isContextLost())
-        return;
-
-    // This is an approximation because at WebGLRenderingContext level we don't
-    // know if the underlying FBO uses textures or renderbuffers.
-    GLint maxSize = std::min(m_maxTextureSize, m_maxRenderbufferSize);
-    // Limit drawing buffer size to 4k to avoid memory exhaustion.
-    const int sizeUpperLimit = 4096;
-    maxSize = std::min(maxSize, sizeUpperLimit);
-    GLint maxWidth = std::min(maxSize, m_maxViewportDims[0]);
-    GLint maxHeight = std::min(maxSize, m_maxViewportDims[1]);
-    width = clamp(width, 1, maxWidth);
-    height = clamp(height, 1, maxHeight);
-
-    if (m_needsUpdate) {
-        RenderBox* renderBox = canvas()->renderBox();
-        if (renderBox && renderBox->hasAcceleratedCompositing())
-            renderBox->contentChanged(CanvasChanged);
-        m_needsUpdate = false;
-    }
-
-    // We don't have to mark the canvas as dirty, since the newly created image buffer will also start off
-    // clear (and this matches what reshape will do).
-    m_drawingBuffer->reset(IntSize(width, height));
-    restoreStateAfterClear();
-
-    m_context->bindTexture(GL_TEXTURE_2D, objectOrZero(m_textureUnits[m_activeTextureUnit].m_texture2DBinding.get()));
-    m_context->bindRenderbuffer(GL_RENDERBUFFER, objectOrZero(m_renderbufferBinding.get()));
-    if (m_framebufferBinding)
-        m_context->bindFramebuffer(GL_FRAMEBUFFER, objectOrZero(m_framebufferBinding.get()));
-}
-
-int WebGLRenderingContext::drawingBufferWidth() const
-{
-    return m_drawingBuffer->size().width();
-}
-
-int WebGLRenderingContext::drawingBufferHeight() const
-{
-    return m_drawingBuffer->size().height();
-}
-
-unsigned WebGLRenderingContext::sizeInBytes(GLenum type)
-{
-    switch (type) {
-    case GL_BYTE:
-        return sizeof(GLbyte);
-    case GL_UNSIGNED_BYTE:
-        return sizeof(GLubyte);
-    case GL_SHORT:
-        return sizeof(GLshort);
-    case GL_UNSIGNED_SHORT:
-        return sizeof(GLushort);
-    case GL_INT:
-        return sizeof(GLint);
-    case GL_UNSIGNED_INT:
-        return sizeof(GLuint);
-    case GL_FLOAT:
-        return sizeof(GLfloat);
-    }
-    ASSERT_NOT_REACHED();
-    return 0;
-}
-
-void WebGLRenderingContext::activeTexture(GLenum texture)
-{
-    if (isContextLost())
-        return;
-    if (texture - GL_TEXTURE0 >= m_textureUnits.size()) {
-        synthesizeGLError(GL_INVALID_ENUM, "activeTexture", "texture unit out of range");
-        return;
-    }
-    m_activeTextureUnit = texture - GL_TEXTURE0;
-    m_context->activeTexture(texture);
-
-    m_drawingBuffer->setActiveTextureUnit(texture);
-
-}
-
-void WebGLRenderingContext::attachShader(WebGLProgram* program, WebGLShader* shader)
-{
-    if (isContextLost() || !validateWebGLObject("attachShader", program) || !validateWebGLObject("attachShader", shader))
-        return;
-    if (!program->attachShader(shader)) {
-        synthesizeGLError(GL_INVALID_OPERATION, "attachShader", "shader attachment already has shader");
-        return;
-    }
-    m_context->attachShader(objectOrZero(program), objectOrZero(shader));
-    shader->onAttached();
-}
-
-void WebGLRenderingContext::bindAttribLocation(WebGLProgram* program, GLuint index, const String& name)
-{
-    if (isContextLost() || !validateWebGLObject("bindAttribLocation", program))
-        return;
-    if (!validateLocationLength("bindAttribLocation", name))
-        return;
-    if (!validateString("bindAttribLocation", name))
-        return;
-    if (isPrefixReserved(name)) {
-        synthesizeGLError(GL_INVALID_OPERATION, "bindAttribLocation", "reserved prefix");
-        return;
-    }
-    if (index >= m_maxVertexAttribs) {
-        synthesizeGLError(GL_INVALID_VALUE, "bindAttribLocation", "index out of range");
-        return;
-    }
-    m_context->bindAttribLocation(objectOrZero(program), index, name.utf8().data());
-}
-
-bool WebGLRenderingContext::checkObjectToBeBound(const char* functionName, WebGLObject* object, bool& deleted)
-{
-    deleted = false;
-    if (isContextLost())
-        return false;
-    if (object) {
-        if (!object->validate(contextGroup(), this)) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "object not from this context");
-            return false;
-        }
-        deleted = !object->object();
-    }
-    return true;
-}
-
-void WebGLRenderingContext::bindBuffer(GLenum target, WebGLBuffer* buffer)
-{
-    bool deleted;
-    if (!checkObjectToBeBound("bindBuffer", buffer, deleted))
-        return;
-    if (deleted)
-        buffer = 0;
-    if (buffer && buffer->getTarget() && buffer->getTarget() != target) {
-        synthesizeGLError(GL_INVALID_OPERATION, "bindBuffer", "buffers can not be used with multiple targets");
-        return;
-    }
-    if (target == GL_ARRAY_BUFFER)
-        m_boundArrayBuffer = buffer;
-    else if (target == GL_ELEMENT_ARRAY_BUFFER)
-        m_boundVertexArrayObject->setElementArrayBuffer(buffer);
-    else {
-        synthesizeGLError(GL_INVALID_ENUM, "bindBuffer", "invalid target");
-        return;
-    }
-
-    m_context->bindBuffer(target, objectOrZero(buffer));
-    if (buffer)
-        buffer->setTarget(target);
-}
-
-void WebGLRenderingContext::bindFramebuffer(GLenum target, WebGLFramebuffer* buffer)
-{
-    bool deleted;
-    if (!checkObjectToBeBound("bindFramebuffer", buffer, deleted))
-        return;
-    if (deleted)
-        buffer = 0;
-    if (target != GL_FRAMEBUFFER) {
-        synthesizeGLError(GL_INVALID_ENUM, "bindFramebuffer", "invalid target");
-        return;
-    }
-    m_framebufferBinding = buffer;
-    m_drawingBuffer->setFramebufferBinding(objectOrZero(m_framebufferBinding.get()));
-    if (!m_framebufferBinding) {
-        // Instead of binding fb 0, bind the drawing buffer.
-        m_drawingBuffer->bind();
-    } else
-        m_context->bindFramebuffer(target, objectOrZero(buffer));
-    if (buffer)
-        buffer->setHasEverBeenBound();
-    applyStencilTest();
-}
-
-void WebGLRenderingContext::bindRenderbuffer(GLenum target, WebGLRenderbuffer* renderBuffer)
-{
-    bool deleted;
-    if (!checkObjectToBeBound("bindRenderbuffer", renderBuffer, deleted))
-        return;
-    if (deleted)
-        renderBuffer = 0;
-    if (target != GL_RENDERBUFFER) {
-        synthesizeGLError(GL_INVALID_ENUM, "bindRenderbuffer", "invalid target");
-        return;
-    }
-    m_renderbufferBinding = renderBuffer;
-    m_context->bindRenderbuffer(target, objectOrZero(renderBuffer));
-    if (renderBuffer)
-        renderBuffer->setHasEverBeenBound();
-}
-
-void WebGLRenderingContext::bindTexture(GLenum target, WebGLTexture* texture)
-{
-    bool deleted;
-    if (!checkObjectToBeBound("bindTexture", texture, deleted))
-        return;
-    if (deleted)
-        texture = 0;
-    if (texture && texture->getTarget() && texture->getTarget() != target) {
-        synthesizeGLError(GL_INVALID_OPERATION, "bindTexture", "textures can not be used with multiple targets");
-        return;
-    }
-    GLint maxLevel = 0;
-    if (target == GL_TEXTURE_2D) {
-        m_textureUnits[m_activeTextureUnit].m_texture2DBinding = texture;
-        maxLevel = m_maxTextureLevel;
-
-        if (!m_activeTextureUnit)
-            m_drawingBuffer->setTexture2DBinding(objectOrZero(texture));
-
-    } else if (target == GL_TEXTURE_CUBE_MAP) {
-        m_textureUnits[m_activeTextureUnit].m_textureCubeMapBinding = texture;
-        maxLevel = m_maxCubeMapTextureLevel;
-    } else {
-        synthesizeGLError(GL_INVALID_ENUM, "bindTexture", "invalid target");
-        return;
-    }
-
-    m_context->bindTexture(target, objectOrZero(texture));
-    if (texture) {
-        texture->setTarget(target, maxLevel);
-        m_onePlusMaxNonDefaultTextureUnit = max(m_activeTextureUnit + 1, m_onePlusMaxNonDefaultTextureUnit);
-    } else {
-        // If the disabled index is the current maximum, trace backwards to find the new max enabled texture index
-        if (m_onePlusMaxNonDefaultTextureUnit == m_activeTextureUnit + 1) {
-            findNewMaxNonDefaultTextureUnit();
-        }
-    }
-
-    // Note: previously we used to automatically set the TEXTURE_WRAP_R
-    // repeat mode to CLAMP_TO_EDGE for cube map textures, because OpenGL
-    // ES 2.0 doesn't expose this flag (a bug in the specification) and
-    // otherwise the application has no control over the seams in this
-    // dimension. However, it appears that supporting this properly on all
-    // platforms is fairly involved (will require a HashMap from texture ID
-    // in all ports), and we have not had any complaints, so the logic has
-    // been removed.
-
-}
-
-void WebGLRenderingContext::blendColor(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha)
-{
-    if (isContextLost())
-        return;
-    m_context->blendColor(red, green, blue, alpha);
-}
-
-void WebGLRenderingContext::blendEquation(GLenum mode)
-{
-    if (isContextLost() || !validateBlendEquation("blendEquation", mode))
-        return;
-    m_context->blendEquation(mode);
-}
-
-void WebGLRenderingContext::blendEquationSeparate(GLenum modeRGB, GLenum modeAlpha)
-{
-    if (isContextLost() || !validateBlendEquation("blendEquationSeparate", modeRGB) || !validateBlendEquation("blendEquationSeparate", modeAlpha))
-        return;
-    m_context->blendEquationSeparate(modeRGB, modeAlpha);
-}
-
-
-void WebGLRenderingContext::blendFunc(GLenum sfactor, GLenum dfactor)
-{
-    if (isContextLost() || !validateBlendFuncFactors("blendFunc", sfactor, dfactor))
-        return;
-    m_context->blendFunc(sfactor, dfactor);
-}
-
-void WebGLRenderingContext::blendFuncSeparate(GLenum srcRGB, GLenum dstRGB, GLenum srcAlpha, GLenum dstAlpha)
-{
-    // Note: Alpha does not have the same restrictions as RGB.
-    if (isContextLost() || !validateBlendFuncFactors("blendFuncSeparate", srcRGB, dstRGB))
-        return;
-    m_context->blendFuncSeparate(srcRGB, dstRGB, srcAlpha, dstAlpha);
-}
-
-void WebGLRenderingContext::bufferData(GLenum target, long long size, GLenum usage)
-{
-    if (isContextLost())
-        return;
-    WebGLBuffer* buffer = validateBufferDataParameters("bufferData", target, usage);
-    if (!buffer)
-        return;
-    if (size < 0) {
-        synthesizeGLError(GL_INVALID_VALUE, "bufferData", "size < 0");
-        return;
-    }
-    if (!size) {
-        synthesizeGLError(GL_INVALID_VALUE, "bufferData", "size == 0");
-        return;
-    }
-
-    m_context->bufferData(target, static_cast<GLsizeiptr>(size), 0, usage);
-}
-
-void WebGLRenderingContext::bufferData(GLenum target, ArrayBuffer* data, GLenum usage)
-{
-    if (isContextLost())
-        return;
-    WebGLBuffer* buffer = validateBufferDataParameters("bufferData", target, usage);
-    if (!buffer)
-        return;
-    if (!data) {
-        synthesizeGLError(GL_INVALID_VALUE, "bufferData", "no data");
-        return;
-    }
-    m_context->bufferData(target, data->byteLength(), data->data(), usage);
-}
-
-void WebGLRenderingContext::bufferData(GLenum target, ArrayBufferView* data, GLenum usage)
-{
-    if (isContextLost())
-        return;
-    WebGLBuffer* buffer = validateBufferDataParameters("bufferData", target, usage);
-    if (!buffer)
-        return;
-    if (!data) {
-        synthesizeGLError(GL_INVALID_VALUE, "bufferData", "no data");
-        return;
-    }
-
-    m_context->bufferData(target, data->byteLength(), data->baseAddress(), usage);
-}
-
-void WebGLRenderingContext::bufferSubData(GLenum target, long long offset, ArrayBuffer* data)
-{
-    if (isContextLost())
-        return;
-    WebGLBuffer* buffer = validateBufferDataParameters("bufferSubData", target, GL_STATIC_DRAW);
-    if (!buffer)
-        return;
-    if (offset < 0) {
-        synthesizeGLError(GL_INVALID_VALUE, "bufferSubData", "offset < 0");
-        return;
-    }
-    if (!data)
-        return;
-
-    m_context->bufferSubData(target, static_cast<GLintptr>(offset), data->byteLength(), data->data());
-}
-
-void WebGLRenderingContext::bufferSubData(GLenum target, long long offset, ArrayBufferView* data)
-{
-    if (isContextLost())
-        return;
-    WebGLBuffer* buffer = validateBufferDataParameters("bufferSubData", target, GL_STATIC_DRAW);
-    if (!buffer)
-        return;
-    if (offset < 0) {
-        synthesizeGLError(GL_INVALID_VALUE, "bufferSubData", "offset < 0");
-        return;
-    }
-    if (!data)
-        return;
-
-    m_context->bufferSubData(target, static_cast<GLintptr>(offset), data->byteLength(), data->baseAddress());
-}
-
-GLenum WebGLRenderingContext::checkFramebufferStatus(GLenum target)
-{
-    if (isContextLost())
-        return GL_FRAMEBUFFER_UNSUPPORTED;
-    if (target != GL_FRAMEBUFFER) {
-        synthesizeGLError(GL_INVALID_ENUM, "checkFramebufferStatus", "invalid target");
-        return 0;
-    }
-    if (!m_framebufferBinding || !m_framebufferBinding->object())
-        return GL_FRAMEBUFFER_COMPLETE;
-    const char* reason = "framebuffer incomplete";
-    GLenum result = m_framebufferBinding->checkStatus(&reason);
-    if (result != GL_FRAMEBUFFER_COMPLETE) {
-        emitGLWarning("checkFramebufferStatus", reason);
-        return result;
-    }
-    result = m_context->checkFramebufferStatus(target);
-    return result;
-}
-
-void WebGLRenderingContext::clear(GLbitfield mask)
-{
-    if (isContextLost())
-        return;
-    if (mask & ~(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT)) {
-        synthesizeGLError(GL_INVALID_VALUE, "clear", "invalid mask");
-        return;
-    }
-    const char* reason = "framebuffer incomplete";
-    if (m_framebufferBinding && !m_framebufferBinding->onAccess(m_context.get(), &reason)) {
-        synthesizeGLError(GL_INVALID_FRAMEBUFFER_OPERATION, "clear", reason);
-        return;
-    }
-    if (!clearIfComposited(mask))
-        m_context->clear(mask);
-    markContextChanged();
-}
-
-void WebGLRenderingContext::clearColor(GLfloat r, GLfloat g, GLfloat b, GLfloat a)
-{
-    if (isContextLost())
-        return;
-    if (std::isnan(r))
-        r = 0;
-    if (std::isnan(g))
-        g = 0;
-    if (std::isnan(b))
-        b = 0;
-    if (std::isnan(a))
-        a = 1;
-    m_clearColor[0] = r;
-    m_clearColor[1] = g;
-    m_clearColor[2] = b;
-    m_clearColor[3] = a;
-    m_context->clearColor(r, g, b, a);
-}
-
-void WebGLRenderingContext::clearDepth(GLfloat depth)
-{
-    if (isContextLost())
-        return;
-    m_clearDepth = depth;
-    m_context->clearDepth(depth);
-}
-
-void WebGLRenderingContext::clearStencil(GLint s)
-{
-    if (isContextLost())
-        return;
-    m_clearStencil = s;
-    m_context->clearStencil(s);
-}
-
-void WebGLRenderingContext::colorMask(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha)
-{
-    if (isContextLost())
-        return;
-    m_colorMask[0] = red;
-    m_colorMask[1] = green;
-    m_colorMask[2] = blue;
-    m_colorMask[3] = alpha;
-    m_context->colorMask(red, green, blue, alpha);
-}
-
-void WebGLRenderingContext::compileShader(WebGLShader* shader)
-{
-    if (isContextLost() || !validateWebGLObject("compileShader", shader))
-        return;
-    m_context->compileShader(objectOrZero(shader));
-}
-
-void WebGLRenderingContext::compressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, ArrayBufferView* data)
-{
-    if (isContextLost())
-        return;
-    if (!validateTexFuncLevel("compressedTexImage2D", target, level))
-        return;
-
-    if (!validateCompressedTexFormat(internalformat)) {
-        synthesizeGLError(GL_INVALID_ENUM, "compressedTexImage2D", "invalid internalformat");
-        return;
-    }
-    if (border) {
-        synthesizeGLError(GL_INVALID_VALUE, "compressedTexImage2D", "border not 0");
-        return;
-    }
-    if (!validateCompressedTexDimensions("compressedTexImage2D", NotTexSubImage2D, target, level, width, height, internalformat))
-        return;
-    if (!validateCompressedTexFuncData("compressedTexImage2D", width, height, internalformat, data))
-        return;
-
-    WebGLTexture* tex = validateTextureBinding("compressedTexImage2D", target, true);
-    if (!tex)
-        return;
-    if (!isGLES2NPOTStrict()) {
-        if (level && WebGLTexture::isNPOT(width, height)) {
-            synthesizeGLError(GL_INVALID_VALUE, "compressedTexImage2D", "level > 0 not power of 2");
-            return;
-        }
-    }
-    m_context->compressedTexImage2D(target, level, internalformat, width, height,
-                                              border, data->byteLength(), data->baseAddress());
-    tex->setLevelInfo(target, level, internalformat, width, height, GL_UNSIGNED_BYTE);
-}
-
-void WebGLRenderingContext::compressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, ArrayBufferView* data)
-{
-    if (isContextLost())
-        return;
-    if (!validateTexFuncLevel("compressedTexSubImage2D", target, level))
-        return;
-    if (!validateCompressedTexFormat(format)) {
-        synthesizeGLError(GL_INVALID_ENUM, "compressedTexSubImage2D", "invalid format");
-        return;
-    }
-    if (!validateCompressedTexFuncData("compressedTexSubImage2D", width, height, format, data))
-        return;
-
-    WebGLTexture* tex = validateTextureBinding("compressedTexSubImage2D", target, true);
-    if (!tex)
-        return;
-
-    if (format != tex->getInternalFormat(target, level)) {
-        synthesizeGLError(GL_INVALID_OPERATION, "compressedTexSubImage2D", "format does not match texture format");
-        return;
-    }
-
-    if (!validateCompressedTexSubDimensions("compressedTexSubImage2D", target, level, xoffset, yoffset, width, height, format, tex))
-        return;
-
-    m_context->compressedTexSubImage2D(target, level, xoffset, yoffset,
-                                                 width, height, format, data->byteLength(), data->baseAddress());
-}
-
-bool WebGLRenderingContext::validateSettableTexFormat(const char* functionName, GLenum format)
-{
-    if (WebGLImageConversion::getClearBitsByFormat(format) & (GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT)) {
-        synthesizeGLError(GL_INVALID_OPERATION, functionName, "format can not be set, only rendered to");
-        return false;
-    }
-    return true;
-}
-
-void WebGLRenderingContext::copyTexImage2D(GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width, GLsizei height, GLint border)
-{
-    if (isContextLost())
-        return;
-    if (!validateTexFuncParameters("copyTexImage2D", NotTexSubImage2D, target, level, internalformat, width, height, border, internalformat, GL_UNSIGNED_BYTE))
-        return;
-    if (!validateSettableTexFormat("copyTexImage2D", internalformat))
-        return;
-    WebGLTexture* tex = validateTextureBinding("copyTexImage2D", target, true);
-    if (!tex)
-        return;
-    if (!isTexInternalFormatColorBufferCombinationValid(internalformat, boundFramebufferColorFormat())) {
-        synthesizeGLError(GL_INVALID_OPERATION, "copyTexImage2D", "framebuffer is incompatible format");
-        return;
-    }
-    if (!isGLES2NPOTStrict() && level && WebGLTexture::isNPOT(width, height)) {
-        synthesizeGLError(GL_INVALID_VALUE, "copyTexImage2D", "level > 0 not power of 2");
-        return;
-    }
-    const char* reason = "framebuffer incomplete";
-    if (m_framebufferBinding && !m_framebufferBinding->onAccess(m_context.get(), &reason)) {
-        synthesizeGLError(GL_INVALID_FRAMEBUFFER_OPERATION, "copyTexImage2D", reason);
-        return;
-    }
-    clearIfComposited();
-    ScopedDrawingBufferBinder binder(m_drawingBuffer.get(), m_framebufferBinding.get());
-    m_context->copyTexImage2D(target, level, internalformat, x, y, width, height, border);
-    // FIXME: if the framebuffer is not complete, none of the below should be executed.
-    tex->setLevelInfo(target, level, internalformat, width, height, GL_UNSIGNED_BYTE);
-}
-
-void WebGLRenderingContext::copyTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height)
-{
-    if (isContextLost())
-        return;
-    if (!validateTexFuncLevel("copyTexSubImage2D", target, level))
-        return;
-    WebGLTexture* tex = validateTextureBinding("copyTexSubImage2D", target, true);
-    if (!tex)
-        return;
-    if (!validateSize("copyTexSubImage2D", xoffset, yoffset) || !validateSize("copyTexSubImage2D", width, height))
-        return;
-    // Before checking if it is in the range, check if overflow happens first.
-    Checked<GLint, RecordOverflow> maxX = xoffset;
-    maxX += width;
-    Checked<GLint, RecordOverflow> maxY = yoffset;
-    maxY += height;
-    if (maxX.hasOverflowed() || maxY.hasOverflowed()) {
-        synthesizeGLError(GL_INVALID_VALUE, "copyTexSubImage2D", "bad dimensions");
-        return;
-    }
-    if (maxX.unsafeGet() > tex->getWidth(target, level) || maxY.unsafeGet() > tex->getHeight(target, level)) {
-        synthesizeGLError(GL_INVALID_VALUE, "copyTexSubImage2D", "rectangle out of range");
-        return;
-    }
-    GLenum internalformat = tex->getInternalFormat(target, level);
-    if (!validateSettableTexFormat("copyTexSubImage2D", internalformat))
-        return;
-    if (!isTexInternalFormatColorBufferCombinationValid(internalformat, boundFramebufferColorFormat())) {
-        synthesizeGLError(GL_INVALID_OPERATION, "copyTexSubImage2D", "framebuffer is incompatible format");
-        return;
-    }
-    const char* reason = "framebuffer incomplete";
-    if (m_framebufferBinding && !m_framebufferBinding->onAccess(m_context.get(), &reason)) {
-        synthesizeGLError(GL_INVALID_FRAMEBUFFER_OPERATION, "copyTexSubImage2D", reason);
-        return;
-    }
-    clearIfComposited();
-    ScopedDrawingBufferBinder binder(m_drawingBuffer.get(), m_framebufferBinding.get());
-    m_context->copyTexSubImage2D(target, level, xoffset, yoffset, x, y, width, height);
-}
-
-PassRefPtr<WebGLBuffer> WebGLRenderingContext::createBuffer()
-{
-    if (isContextLost())
-        return 0;
-    RefPtr<WebGLBuffer> o = WebGLBuffer::create(this);
-    addSharedObject(o.get());
-    return o;
-}
-
-PassRefPtr<WebGLFramebuffer> WebGLRenderingContext::createFramebuffer()
-{
-    if (isContextLost())
-        return 0;
-    RefPtr<WebGLFramebuffer> o = WebGLFramebuffer::create(this);
-    addContextObject(o.get());
-    return o;
-}
-
-PassRefPtr<WebGLTexture> WebGLRenderingContext::createTexture()
-{
-    if (isContextLost())
-        return 0;
-    RefPtr<WebGLTexture> o = WebGLTexture::create(this);
-    addSharedObject(o.get());
-    return o;
-}
-
-PassRefPtr<WebGLProgram> WebGLRenderingContext::createProgram()
-{
-    if (isContextLost())
-        return 0;
-    RefPtr<WebGLProgram> o = WebGLProgram::create(this);
-    addSharedObject(o.get());
-    return o;
-}
-
-PassRefPtr<WebGLRenderbuffer> WebGLRenderingContext::createRenderbuffer()
-{
-    if (isContextLost())
-        return 0;
-    RefPtr<WebGLRenderbuffer> o = WebGLRenderbuffer::create(this);
-    addSharedObject(o.get());
-    return o;
-}
-
-WebGLRenderbuffer* WebGLRenderingContext::ensureEmulatedStencilBuffer(GLenum target, WebGLRenderbuffer* renderbuffer)
-{
-    if (isContextLost())
-        return 0;
-    if (!renderbuffer->emulatedStencilBuffer()) {
-        renderbuffer->setEmulatedStencilBuffer(createRenderbuffer());
-        m_context->bindRenderbuffer(target, objectOrZero(renderbuffer->emulatedStencilBuffer()));
-        m_context->bindRenderbuffer(target, objectOrZero(m_renderbufferBinding.get()));
-    }
-    return renderbuffer->emulatedStencilBuffer();
-}
-
-PassRefPtr<WebGLShader> WebGLRenderingContext::createShader(GLenum type)
-{
-    if (isContextLost())
-        return 0;
-    if (type != GL_VERTEX_SHADER && type != GL_FRAGMENT_SHADER) {
-        synthesizeGLError(GL_INVALID_ENUM, "createShader", "invalid shader type");
-        return 0;
-    }
-
-    RefPtr<WebGLShader> o = WebGLShader::create(this, type);
-    addSharedObject(o.get());
-    return o;
-}
-
-void WebGLRenderingContext::cullFace(GLenum mode)
-{
-    if (isContextLost())
-        return;
-    switch (mode) {
-    case GL_FRONT_AND_BACK:
-    case GL_FRONT:
-    case GL_BACK:
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "cullFace", "invalid mode");
-        return;
-    }
-    m_context->cullFace(mode);
-}
-
-bool WebGLRenderingContext::deleteObject(WebGLObject* object)
-{
-    if (isContextLost() || !object)
-        return false;
-    if (!object->validate(contextGroup(), this)) {
-        synthesizeGLError(GL_INVALID_OPERATION, "delete", "object does not belong to this context");
-        return false;
-    }
-    if (object->object()) {
-        // We need to pass in context here because we want
-        // things in this context unbound.
-        object->deleteObject(m_context.get());
-    }
-    return true;
-}
-
-void WebGLRenderingContext::deleteBuffer(WebGLBuffer* buffer)
-{
-    if (!deleteObject(buffer))
-        return;
-    if (m_boundArrayBuffer == buffer)
-        m_boundArrayBuffer = 0;
-
-    m_boundVertexArrayObject->unbindBuffer(buffer);
-}
-
-void WebGLRenderingContext::deleteFramebuffer(WebGLFramebuffer* framebuffer)
-{
-    if (!deleteObject(framebuffer))
-        return;
-    if (framebuffer == m_framebufferBinding) {
-        m_framebufferBinding = 0;
-        m_drawingBuffer->setFramebufferBinding(0);
-        // Have to call bindFramebuffer here to bind back to internal fbo.
-        m_drawingBuffer->bind();
-    }
-}
-
-void WebGLRenderingContext::deleteProgram(WebGLProgram* program)
-{
-    deleteObject(program);
-    // We don't reset m_currentProgram to 0 here because the deletion of the
-    // current program is delayed.
-}
-
-void WebGLRenderingContext::deleteRenderbuffer(WebGLRenderbuffer* renderbuffer)
-{
-    if (!deleteObject(renderbuffer))
-        return;
-    if (renderbuffer == m_renderbufferBinding)
-        m_renderbufferBinding = 0;
-    if (m_framebufferBinding)
-        m_framebufferBinding->removeAttachmentFromBoundFramebuffer(renderbuffer);
-}
-
-void WebGLRenderingContext::deleteShader(WebGLShader* shader)
-{
-    deleteObject(shader);
-}
-
-void WebGLRenderingContext::deleteTexture(WebGLTexture* texture)
-{
-    if (!deleteObject(texture))
-        return;
-
-    int maxBoundTextureIndex = -1;
-    for (size_t i = 0; i < m_onePlusMaxNonDefaultTextureUnit; ++i) {
-        if (texture == m_textureUnits[i].m_texture2DBinding) {
-            m_textureUnits[i].m_texture2DBinding = 0;
-            maxBoundTextureIndex = i;
-            if (!i)
-                m_drawingBuffer->setTexture2DBinding(0);
-        }
-        if (texture == m_textureUnits[i].m_textureCubeMapBinding) {
-            m_textureUnits[i].m_textureCubeMapBinding = 0;
-            maxBoundTextureIndex = i;
-        }
-    }
-    if (m_framebufferBinding)
-        m_framebufferBinding->removeAttachmentFromBoundFramebuffer(texture);
-
-    // If the deleted was bound to the the current maximum index, trace backwards to find the new max texture index
-    if (m_onePlusMaxNonDefaultTextureUnit == static_cast<unsigned long>(maxBoundTextureIndex + 1)) {
-        findNewMaxNonDefaultTextureUnit();
-    }
-}
-
-void WebGLRenderingContext::depthFunc(GLenum func)
-{
-    if (isContextLost())
-        return;
-    if (!validateStencilOrDepthFunc("depthFunc", func))
-        return;
-    m_context->depthFunc(func);
-}
-
-void WebGLRenderingContext::depthMask(GLboolean flag)
-{
-    if (isContextLost())
-        return;
-    m_depthMask = flag;
-    m_context->depthMask(flag);
-}
-
-void WebGLRenderingContext::depthRange(GLfloat zNear, GLfloat zFar)
-{
-    if (isContextLost())
-        return;
-    if (zNear > zFar) {
-        synthesizeGLError(GL_INVALID_OPERATION, "depthRange", "zNear > zFar");
-        return;
-    }
-    m_context->depthRange(zNear, zFar);
-}
-
-void WebGLRenderingContext::detachShader(WebGLProgram* program, WebGLShader* shader)
-{
-    if (isContextLost() || !validateWebGLObject("detachShader", program) || !validateWebGLObject("detachShader", shader))
-        return;
-    if (!program->detachShader(shader)) {
-        synthesizeGLError(GL_INVALID_OPERATION, "detachShader", "shader not attached");
-        return;
-    }
-    m_context->detachShader(objectOrZero(program), objectOrZero(shader));
-    shader->onDetached(m_context.get());
-}
-
-void WebGLRenderingContext::disable(GLenum cap)
-{
-    if (isContextLost() || !validateCapability("disable", cap))
-        return;
-    if (cap == GL_STENCIL_TEST) {
-        m_stencilEnabled = false;
-        applyStencilTest();
-        return;
-    }
-    if (cap == GL_SCISSOR_TEST) {
-        m_scissorEnabled = false;
-        m_drawingBuffer->setScissorEnabled(m_scissorEnabled);
-    }
-    m_context->disable(cap);
-}
-
-void WebGLRenderingContext::disableVertexAttribArray(GLuint index)
-{
-    if (isContextLost())
-        return;
-    if (index >= m_maxVertexAttribs) {
-        synthesizeGLError(GL_INVALID_VALUE, "disableVertexAttribArray", "index out of range");
-        return;
-    }
-
-    WebGLVertexArrayObjectOES::VertexAttribState& state = m_boundVertexArrayObject->getVertexAttribState(index);
-    state.enabled = false;
-
-    // If the disabled index is the current maximum, trace backwards to find the new max enabled attrib index
-    if (m_onePlusMaxEnabledAttribIndex == index + 1) {
-        findNewMaxEnabledAttribIndex();
-    }
-
-    m_context->disableVertexAttribArray(index);
-}
-
-bool WebGLRenderingContext::validateRenderingState(const char* functionName)
-{
-    if (!m_currentProgram) {
-        synthesizeGLError(GL_INVALID_OPERATION, functionName, "no valid shader program in use");
-        return false;
-    }
-
-    // Look in each enabled vertex attrib and check if they've been bound to a buffer.
-    for (unsigned i = 0; i < m_onePlusMaxEnabledAttribIndex; ++i) {
-        const WebGLVertexArrayObjectOES::VertexAttribState& state = m_boundVertexArrayObject->getVertexAttribState(i);
-        if (state.enabled
-            && (!state.bufferBinding || !state.bufferBinding->object())) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, String::format("attribute %d is enabled but has no buffer bound", i).utf8().data());
-            return false;
-        }
-    }
-
-    return true;
-}
-
-bool WebGLRenderingContext::validateWebGLObject(const char* functionName, WebGLObject* object)
-{
-    if (!object || !object->object()) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "no object or object deleted");
-        return false;
-    }
-    if (!object->validate(contextGroup(), this)) {
-        synthesizeGLError(GL_INVALID_OPERATION, functionName, "object does not belong to this context");
-        return false;
-    }
-    return true;
-}
-
-void WebGLRenderingContext::drawArrays(GLenum mode, GLint first, GLsizei count)
-{
-    if (!validateDrawArrays("drawArrays", mode, first, count))
-        return;
-
-    clearIfComposited();
-
-    handleTextureCompleteness("drawArrays", true);
-    m_context->drawArrays(mode, first, count);
-    handleTextureCompleteness("drawArrays", false);
-    markContextChanged();
-}
-
-void WebGLRenderingContext::drawElements(GLenum mode, GLsizei count, GLenum type, long long offset)
-{
-    if (!validateDrawElements("drawElements", mode, count, type, offset))
-        return;
-
-    clearIfComposited();
-
-    handleTextureCompleteness("drawElements", true);
-    m_context->drawElements(mode, count, type, static_cast<GLintptr>(offset));
-    handleTextureCompleteness("drawElements", false);
-    markContextChanged();
-}
-
-void WebGLRenderingContext::drawArraysInstancedANGLE(GLenum mode, GLint first, GLsizei count, GLsizei primcount)
-{
-    if (!validateDrawArrays("drawArraysInstancedANGLE", mode, first, count))
-        return;
-
-    if (!validateDrawInstanced("drawArraysInstancedANGLE", primcount))
-        return;
-
-    clearIfComposited();
-
-    handleTextureCompleteness("drawArraysInstancedANGLE", true);
-    m_context->drawArraysInstancedANGLE(mode, first, count, primcount);
-    handleTextureCompleteness("drawArraysInstancedANGLE", false);
-    markContextChanged();
-}
-
-void WebGLRenderingContext::drawElementsInstancedANGLE(GLenum mode, GLsizei count, GLenum type, GLintptr offset, GLsizei primcount)
-{
-    if (!validateDrawElements("drawElementsInstancedANGLE", mode, count, type, offset))
-        return;
-
-    if (!validateDrawInstanced("drawElementsInstancedANGLE", primcount))
-        return;
-
-    clearIfComposited();
-
-    handleTextureCompleteness("drawElementsInstancedANGLE", true);
-    m_context->drawElementsInstancedANGLE(mode, count, type, static_cast<GLintptr>(offset), primcount);
-    handleTextureCompleteness("drawElementsInstancedANGLE", false);
-    markContextChanged();
-}
-
-void WebGLRenderingContext::enable(GLenum cap)
-{
-    if (isContextLost() || !validateCapability("enable", cap))
-        return;
-    if (cap == GL_STENCIL_TEST) {
-        m_stencilEnabled = true;
-        applyStencilTest();
-        return;
-    }
-    if (cap == GL_SCISSOR_TEST) {
-        m_scissorEnabled = true;
-        m_drawingBuffer->setScissorEnabled(m_scissorEnabled);
-    }
-    m_context->enable(cap);
-}
-
-void WebGLRenderingContext::enableVertexAttribArray(GLuint index)
-{
-    if (isContextLost())
-        return;
-    if (index >= m_maxVertexAttribs) {
-        synthesizeGLError(GL_INVALID_VALUE, "enableVertexAttribArray", "index out of range");
-        return;
-    }
-
-    WebGLVertexArrayObjectOES::VertexAttribState& state = m_boundVertexArrayObject->getVertexAttribState(index);
-    state.enabled = true;
-
-    m_onePlusMaxEnabledAttribIndex = max(index + 1, m_onePlusMaxEnabledAttribIndex);
-
-    m_context->enableVertexAttribArray(index);
-}
-
-void WebGLRenderingContext::finish()
-{
-    if (isContextLost())
-        return;
-    m_context->flush(); // Intentionally a flush, not a finish.
-}
-
-void WebGLRenderingContext::flush()
-{
-    if (isContextLost())
-        return;
-    m_context->flush();
-}
-
-void WebGLRenderingContext::framebufferRenderbuffer(GLenum target, GLenum attachment, GLenum renderbuffertarget, WebGLRenderbuffer* buffer)
-{
-    if (isContextLost() || !validateFramebufferFuncParameters("framebufferRenderbuffer", target, attachment))
-        return;
-    if (renderbuffertarget != GL_RENDERBUFFER) {
-        synthesizeGLError(GL_INVALID_ENUM, "framebufferRenderbuffer", "invalid target");
-        return;
-    }
-    if (buffer && !buffer->validate(contextGroup(), this)) {
-        synthesizeGLError(GL_INVALID_OPERATION, "framebufferRenderbuffer", "no buffer or buffer not from this context");
-        return;
-    }
-    // Don't allow the default framebuffer to be mutated; all current
-    // implementations use an FBO internally in place of the default
-    // FBO.
-    if (!m_framebufferBinding || !m_framebufferBinding->object()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "framebufferRenderbuffer", "no framebuffer bound");
-        return;
-    }
-    Platform3DObject bufferObject = objectOrZero(buffer);
-    switch (attachment) {
-    case GC3D_DEPTH_STENCIL_ATTACHMENT_WEBGL:
-        if (isDepthStencilSupported() || !buffer) {
-            m_context->framebufferRenderbuffer(target, GL_DEPTH_ATTACHMENT, renderbuffertarget, bufferObject);
-            m_context->framebufferRenderbuffer(target, GL_STENCIL_ATTACHMENT, renderbuffertarget, bufferObject);
-        } else {
-            WebGLRenderbuffer* emulatedStencilBuffer = ensureEmulatedStencilBuffer(renderbuffertarget, buffer);
-            if (!emulatedStencilBuffer) {
-                synthesizeGLError(GL_OUT_OF_MEMORY, "framebufferRenderbuffer", "out of memory");
-                return;
-            }
-            m_context->framebufferRenderbuffer(target, GL_DEPTH_ATTACHMENT, renderbuffertarget, bufferObject);
-            m_context->framebufferRenderbuffer(target, GL_STENCIL_ATTACHMENT, renderbuffertarget, objectOrZero(emulatedStencilBuffer));
-        }
-        break;
-    default:
-        m_context->framebufferRenderbuffer(target, attachment, renderbuffertarget, bufferObject);
-    }
-    m_framebufferBinding->setAttachmentForBoundFramebuffer(attachment, buffer);
-    applyStencilTest();
-}
-
-void WebGLRenderingContext::framebufferTexture2D(GLenum target, GLenum attachment, GLenum textarget, WebGLTexture* texture, GLint level)
-{
-    if (isContextLost() || !validateFramebufferFuncParameters("framebufferTexture2D", target, attachment))
-        return;
-    if (level) {
-        synthesizeGLError(GL_INVALID_VALUE, "framebufferTexture2D", "level not 0");
-        return;
-    }
-    if (texture && !texture->validate(contextGroup(), this)) {
-        synthesizeGLError(GL_INVALID_OPERATION, "framebufferTexture2D", "no texture or texture not from this context");
-        return;
-    }
-    // Don't allow the default framebuffer to be mutated; all current
-    // implementations use an FBO internally in place of the default
-    // FBO.
-    if (!m_framebufferBinding || !m_framebufferBinding->object()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "framebufferTexture2D", "no framebuffer bound");
-        return;
-    }
-    Platform3DObject textureObject = objectOrZero(texture);
-    switch (attachment) {
-    case GC3D_DEPTH_STENCIL_ATTACHMENT_WEBGL:
-        m_context->framebufferTexture2D(target, GL_DEPTH_ATTACHMENT, textarget, textureObject, level);
-        m_context->framebufferTexture2D(target, GL_STENCIL_ATTACHMENT, textarget, textureObject, level);
-        break;
-    case GL_DEPTH_ATTACHMENT:
-        m_context->framebufferTexture2D(target, attachment, textarget, textureObject, level);
-        break;
-    case GL_STENCIL_ATTACHMENT:
-        m_context->framebufferTexture2D(target, attachment, textarget, textureObject, level);
-        break;
-    default:
-        m_context->framebufferTexture2D(target, attachment, textarget, textureObject, level);
-    }
-    m_framebufferBinding->setAttachmentForBoundFramebuffer(attachment, textarget, texture, level);
-    applyStencilTest();
-}
-
-void WebGLRenderingContext::frontFace(GLenum mode)
-{
-    if (isContextLost())
-        return;
-    switch (mode) {
-    case GL_CW:
-    case GL_CCW:
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "frontFace", "invalid mode");
-        return;
-    }
-    m_context->frontFace(mode);
-}
-
-void WebGLRenderingContext::generateMipmap(GLenum target)
-{
-    if (isContextLost())
-        return;
-    WebGLTexture* tex = validateTextureBinding("generateMipmap", target, false);
-    if (!tex)
-        return;
-    if (!tex->canGenerateMipmaps()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "generateMipmap", "level 0 not power of 2 or not all the same size");
-        return;
-    }
-    if (!validateSettableTexFormat("generateMipmap", tex->getInternalFormat(target, 0)))
-        return;
-
-    // generateMipmap won't work properly if minFilter is not NEAREST_MIPMAP_LINEAR
-    // on Mac.  Remove the hack once this driver bug is fixed.
-#if OS(MACOSX)
-    bool needToResetMinFilter = false;
-    if (tex->getMinFilter() != GL_NEAREST_MIPMAP_LINEAR) {
-        m_context->texParameteri(target, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);
-        needToResetMinFilter = true;
-    }
-#endif
-    m_context->generateMipmap(target);
-#if OS(MACOSX)
-    if (needToResetMinFilter)
-        m_context->texParameteri(target, GL_TEXTURE_MIN_FILTER, tex->getMinFilter());
-#endif
-    tex->generateMipmapLevelInfo();
-}
-
-PassRefPtr<WebGLActiveInfo> WebGLRenderingContext::getActiveAttrib(WebGLProgram* program, GLuint index)
-{
-    if (isContextLost() || !validateWebGLObject("getActiveAttrib", program))
-        return 0;
-    blink::WebGraphicsContext3D::ActiveInfo info;
-    if (!m_context->getActiveAttrib(objectOrZero(program), index, info))
-        return 0;
-    return WebGLActiveInfo::create(info.name, info.type, info.size);
-}
-
-PassRefPtr<WebGLActiveInfo> WebGLRenderingContext::getActiveUniform(WebGLProgram* program, GLuint index)
-{
-    if (isContextLost() || !validateWebGLObject("getActiveUniform", program))
-        return 0;
-    blink::WebGraphicsContext3D::ActiveInfo info;
-    if (!m_context->getActiveUniform(objectOrZero(program), index, info))
-        return 0;
-    return WebGLActiveInfo::create(info.name, info.type, info.size);
-}
-
-bool WebGLRenderingContext::getAttachedShaders(WebGLProgram* program, Vector<RefPtr<WebGLShader> >& shaderObjects)
-{
-    shaderObjects.clear();
-    if (isContextLost() || !validateWebGLObject("getAttachedShaders", program))
-        return false;
-
-    const GLenum shaderType[] = {
-        GL_VERTEX_SHADER,
-        GL_FRAGMENT_SHADER
-    };
-    for (unsigned i = 0; i < sizeof(shaderType) / sizeof(GLenum); ++i) {
-        WebGLShader* shader = program->getAttachedShader(shaderType[i]);
-        if (shader)
-            shaderObjects.append(shader);
-    }
-    return true;
-}
-
-GLint WebGLRenderingContext::getAttribLocation(WebGLProgram* program, const String& name)
-{
-    if (isContextLost() || !validateWebGLObject("getAttribLocation", program))
-        return -1;
-    if (!validateLocationLength("getAttribLocation", name))
-        return -1;
-    if (!validateString("getAttribLocation", name))
-        return -1;
-    if (isPrefixReserved(name))
-        return -1;
-    if (!program->linkStatus()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "getAttribLocation", "program not linked");
-        return 0;
-    }
-    return m_context->getAttribLocation(objectOrZero(program), name.utf8().data());
-}
-
-WebGLGetInfo WebGLRenderingContext::getBufferParameter(GLenum target, GLenum pname)
-{
-    if (isContextLost())
-        return WebGLGetInfo();
-    if (target != GL_ARRAY_BUFFER && target != GL_ELEMENT_ARRAY_BUFFER) {
-        synthesizeGLError(GL_INVALID_ENUM, "getBufferParameter", "invalid target");
-        return WebGLGetInfo();
-    }
-
-    if (pname != GL_BUFFER_SIZE && pname != GL_BUFFER_USAGE) {
-        synthesizeGLError(GL_INVALID_ENUM, "getBufferParameter", "invalid parameter name");
-        return WebGLGetInfo();
-    }
-
-    GLint value = 0;
-    m_context->getBufferParameteriv(target, pname, &value);
-    if (pname == GL_BUFFER_SIZE)
-        return WebGLGetInfo(value);
-    return WebGLGetInfo(static_cast<unsigned>(value));
-}
-
-PassRefPtr<WebGLContextAttributes> WebGLRenderingContext::getContextAttributes()
-{
-    if (isContextLost())
-        return 0;
-    // We always need to return a new WebGLContextAttributes object to
-    // prevent the user from mutating any cached version.
-    blink::WebGraphicsContext3D::Attributes attrs = m_context->getContextAttributes();
-    RefPtr<WebGLContextAttributes> attributes = m_requestedAttributes->clone();
-    // Some requested attributes may not be honored, so we need to query the underlying
-    // context/drawing buffer and adjust accordingly.
-    if (m_requestedAttributes->depth() && !attrs.depth)
-        attributes->setDepth(false);
-    if (m_requestedAttributes->stencil() && !attrs.stencil)
-        attributes->setStencil(false);
-    attributes->setAntialias(m_drawingBuffer->multisample());
-    return attributes.release();
-}
-
-GLenum WebGLRenderingContext::getError()
-{
-    if (m_lostContextErrors.size()) {
-        GLenum err = m_lostContextErrors.first();
-        m_lostContextErrors.remove(0);
-        return err;
-    }
-
-    if (isContextLost())
-        return GL_NO_ERROR;
-
-    return m_context->getError();
-}
-
-bool WebGLRenderingContext::ExtensionTracker::matchesNameWithPrefixes(const String& name) const
-{
-    static const char* const unprefixed[] = { "", 0, };
-
-    const char* const* prefixes = m_prefixes ? m_prefixes : unprefixed;
-    for (; *prefixes; ++prefixes) {
-        String prefixedName = String(*prefixes) + extensionName();
-        if (equalIgnoringCase(prefixedName, name)) {
-            return true;
-        }
-    }
-    return false;
-}
-
-PassRefPtr<WebGLExtension> WebGLRenderingContext::getExtension(const String& name)
-{
-    if (isContextLost())
-        return 0;
-
-    for (size_t i = 0; i < m_extensions.size(); ++i) {
-        ExtensionTracker* tracker = m_extensions[i];
-        if (tracker->matchesNameWithPrefixes(name)) {
-            if (tracker->webglDebugRendererInfo() && !allowWebGLDebugRendererInfo())
-                return 0;
-            if (tracker->privileged() && !allowPrivilegedExtensions())
-                return 0;
-            if (tracker->draft() && !RuntimeEnabledFeatures::webGLDraftExtensionsEnabled())
-                return 0;
-            if (!tracker->supported(this))
-                return 0;
-            return tracker->getExtension(this);
-        }
-    }
-
-    return 0;
-}
-
-WebGLGetInfo WebGLRenderingContext::getFramebufferAttachmentParameter(GLenum target, GLenum attachment, GLenum pname)
-{
-    if (isContextLost() || !validateFramebufferFuncParameters("getFramebufferAttachmentParameter", target, attachment))
-        return WebGLGetInfo();
-
-    if (!m_framebufferBinding || !m_framebufferBinding->object()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "getFramebufferAttachmentParameter", "no framebuffer bound");
-        return WebGLGetInfo();
-    }
-
-    WebGLSharedObject* object = m_framebufferBinding->getAttachmentObject(attachment);
-    if (!object) {
-        if (pname == GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE)
-            return WebGLGetInfo(GL_NONE);
-        // OpenGL ES 2.0 specifies INVALID_ENUM in this case, while desktop GL
-        // specifies INVALID_OPERATION.
-        synthesizeGLError(GL_INVALID_ENUM, "getFramebufferAttachmentParameter", "invalid parameter name");
-        return WebGLGetInfo();
-    }
-
-    ASSERT(object->isTexture() || object->isRenderbuffer());
-    if (object->isTexture()) {
-        switch (pname) {
-        case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
-            return WebGLGetInfo(GL_TEXTURE);
-        case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
-            return WebGLGetInfo(PassRefPtr<WebGLTexture>(static_cast<WebGLTexture*>(object)));
-        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:
-        case GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:
-            {
-                GLint value = 0;
-                m_context->getFramebufferAttachmentParameteriv(target, attachment, pname, &value);
-                return WebGLGetInfo(value);
-            }
-        default:
-            synthesizeGLError(GL_INVALID_ENUM, "getFramebufferAttachmentParameter", "invalid parameter name for texture attachment");
-            return WebGLGetInfo();
-        }
-    } else {
-        switch (pname) {
-        case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
-            return WebGLGetInfo(GL_RENDERBUFFER);
-        case GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
-            return WebGLGetInfo(PassRefPtr<WebGLRenderbuffer>(static_cast<WebGLRenderbuffer*>(object)));
-        default:
-            synthesizeGLError(GL_INVALID_ENUM, "getFramebufferAttachmentParameter", "invalid parameter name for renderbuffer attachment");
-            return WebGLGetInfo();
-        }
-    }
-}
-
-WebGLGetInfo WebGLRenderingContext::getParameter(GLenum pname)
-{
-    if (isContextLost())
-        return WebGLGetInfo();
-    const int intZero = 0;
-    switch (pname) {
-    case GL_ACTIVE_TEXTURE:
-        return getUnsignedIntParameter(pname);
-    case GL_ALIASED_LINE_WIDTH_RANGE:
-        return getWebGLFloatArrayParameter(pname);
-    case GL_ALIASED_POINT_SIZE_RANGE:
-        return getWebGLFloatArrayParameter(pname);
-    case GL_ALPHA_BITS:
-        return getIntParameter(pname);
-    case GL_ARRAY_BUFFER_BINDING:
-        return WebGLGetInfo(PassRefPtr<WebGLBuffer>(m_boundArrayBuffer));
-    case GL_BLEND:
-        return getBooleanParameter(pname);
-    case GL_BLEND_COLOR:
-        return getWebGLFloatArrayParameter(pname);
-    case GL_BLEND_DST_ALPHA:
-        return getUnsignedIntParameter(pname);
-    case GL_BLEND_DST_RGB:
-        return getUnsignedIntParameter(pname);
-    case GL_BLEND_EQUATION_ALPHA:
-        return getUnsignedIntParameter(pname);
-    case GL_BLEND_EQUATION_RGB:
-        return getUnsignedIntParameter(pname);
-    case GL_BLEND_SRC_ALPHA:
-        return getUnsignedIntParameter(pname);
-    case GL_BLEND_SRC_RGB:
-        return getUnsignedIntParameter(pname);
-    case GL_BLUE_BITS:
-        return getIntParameter(pname);
-    case GL_COLOR_CLEAR_VALUE:
-        return getWebGLFloatArrayParameter(pname);
-    case GL_COLOR_WRITEMASK:
-        return getBooleanArrayParameter(pname);
-    case GL_COMPRESSED_TEXTURE_FORMATS:
-        return WebGLGetInfo(Uint32Array::create(m_compressedTextureFormats.data(), m_compressedTextureFormats.size()));
-    case GL_CULL_FACE:
-        return getBooleanParameter(pname);
-    case GL_CULL_FACE_MODE:
-        return getUnsignedIntParameter(pname);
-    case GL_CURRENT_PROGRAM:
-        return WebGLGetInfo(PassRefPtr<WebGLProgram>(m_currentProgram));
-    case GL_DEPTH_BITS:
-        if (!m_framebufferBinding && !m_requestedAttributes->depth())
-            return WebGLGetInfo(intZero);
-        return getIntParameter(pname);
-    case GL_DEPTH_CLEAR_VALUE:
-        return getFloatParameter(pname);
-    case GL_DEPTH_FUNC:
-        return getUnsignedIntParameter(pname);
-    case GL_DEPTH_RANGE:
-        return getWebGLFloatArrayParameter(pname);
-    case GL_DEPTH_TEST:
-        return getBooleanParameter(pname);
-    case GL_DEPTH_WRITEMASK:
-        return getBooleanParameter(pname);
-    case GL_DITHER:
-        return getBooleanParameter(pname);
-    case GL_ELEMENT_ARRAY_BUFFER_BINDING:
-        return WebGLGetInfo(PassRefPtr<WebGLBuffer>(m_boundVertexArrayObject->boundElementArrayBuffer()));
-    case GL_FRAMEBUFFER_BINDING:
-        return WebGLGetInfo(PassRefPtr<WebGLFramebuffer>(m_framebufferBinding));
-    case GL_FRONT_FACE:
-        return getUnsignedIntParameter(pname);
-    case GL_GENERATE_MIPMAP_HINT:
-        return getUnsignedIntParameter(pname);
-    case GL_GREEN_BITS:
-        return getIntParameter(pname);
-    case GL_LINE_WIDTH:
-        return getFloatParameter(pname);
-    case GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
-        return getIntParameter(pname);
-    case GL_MAX_CUBE_MAP_TEXTURE_SIZE:
-        return getIntParameter(pname);
-    case GL_MAX_FRAGMENT_UNIFORM_VECTORS:
-        return getIntParameter(pname);
-    case GL_MAX_RENDERBUFFER_SIZE:
-        return getIntParameter(pname);
-    case GL_MAX_TEXTURE_IMAGE_UNITS:
-        return getIntParameter(pname);
-    case GL_MAX_TEXTURE_SIZE:
-        return getIntParameter(pname);
-    case GL_MAX_VARYING_VECTORS:
-        return getIntParameter(pname);
-    case GL_MAX_VERTEX_ATTRIBS:
-        return getIntParameter(pname);
-    case GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
-        return getIntParameter(pname);
-    case GL_MAX_VERTEX_UNIFORM_VECTORS:
-        return getIntParameter(pname);
-    case GL_MAX_VIEWPORT_DIMS:
-        return getWebGLIntArrayParameter(pname);
-    case GL_NUM_SHADER_BINARY_FORMATS:
-        // FIXME: should we always return 0 for this?
-        return getIntParameter(pname);
-    case GL_PACK_ALIGNMENT:
-        return getIntParameter(pname);
-    case GL_POLYGON_OFFSET_FACTOR:
-        return getFloatParameter(pname);
-    case GL_POLYGON_OFFSET_FILL:
-        return getBooleanParameter(pname);
-    case GL_POLYGON_OFFSET_UNITS:
-        return getFloatParameter(pname);
-    case GL_RED_BITS:
-        return getIntParameter(pname);
-    case GL_RENDERBUFFER_BINDING:
-        return WebGLGetInfo(PassRefPtr<WebGLRenderbuffer>(m_renderbufferBinding));
-    case GL_RENDERER:
-        return WebGLGetInfo(String("WebKit WebGL"));
-    case GL_SAMPLE_BUFFERS:
-        return getIntParameter(pname);
-    case GL_SAMPLE_COVERAGE_INVERT:
-        return getBooleanParameter(pname);
-    case GL_SAMPLE_COVERAGE_VALUE:
-        return getFloatParameter(pname);
-    case GL_SAMPLES:
-        return getIntParameter(pname);
-    case GL_SCISSOR_BOX:
-        return getWebGLIntArrayParameter(pname);
-    case GL_SCISSOR_TEST:
-        return getBooleanParameter(pname);
-    case GL_SHADING_LANGUAGE_VERSION:
-        return WebGLGetInfo("WebGL GLSL ES 1.0 (" + String(m_context->getString(GL_SHADING_LANGUAGE_VERSION)) + ")");
-    case GL_STENCIL_BACK_FAIL:
-        return getUnsignedIntParameter(pname);
-    case GL_STENCIL_BACK_FUNC:
-        return getUnsignedIntParameter(pname);
-    case GL_STENCIL_BACK_PASS_DEPTH_FAIL:
-        return getUnsignedIntParameter(pname);
-    case GL_STENCIL_BACK_PASS_DEPTH_PASS:
-        return getUnsignedIntParameter(pname);
-    case GL_STENCIL_BACK_REF:
-        return getIntParameter(pname);
-    case GL_STENCIL_BACK_VALUE_MASK:
-        return getUnsignedIntParameter(pname);
-    case GL_STENCIL_BACK_WRITEMASK:
-        return getUnsignedIntParameter(pname);
-    case GL_STENCIL_BITS:
-        if (!m_framebufferBinding && !m_requestedAttributes->stencil())
-            return WebGLGetInfo(intZero);
-        return getIntParameter(pname);
-    case GL_STENCIL_CLEAR_VALUE:
-        return getIntParameter(pname);
-    case GL_STENCIL_FAIL:
-        return getUnsignedIntParameter(pname);
-    case GL_STENCIL_FUNC:
-        return getUnsignedIntParameter(pname);
-    case GL_STENCIL_PASS_DEPTH_FAIL:
-        return getUnsignedIntParameter(pname);
-    case GL_STENCIL_PASS_DEPTH_PASS:
-        return getUnsignedIntParameter(pname);
-    case GL_STENCIL_REF:
-        return getIntParameter(pname);
-    case GL_STENCIL_TEST:
-        return getBooleanParameter(pname);
-    case GL_STENCIL_VALUE_MASK:
-        return getUnsignedIntParameter(pname);
-    case GL_STENCIL_WRITEMASK:
-        return getUnsignedIntParameter(pname);
-    case GL_SUBPIXEL_BITS:
-        return getIntParameter(pname);
-    case GL_TEXTURE_BINDING_2D:
-        return WebGLGetInfo(PassRefPtr<WebGLTexture>(m_textureUnits[m_activeTextureUnit].m_texture2DBinding));
-    case GL_TEXTURE_BINDING_CUBE_MAP:
-        return WebGLGetInfo(PassRefPtr<WebGLTexture>(m_textureUnits[m_activeTextureUnit].m_textureCubeMapBinding));
-    case GL_UNPACK_ALIGNMENT:
-        return getIntParameter(pname);
-    case GC3D_UNPACK_FLIP_Y_WEBGL:
-        return WebGLGetInfo(m_unpackFlipY);
-    case GC3D_UNPACK_PREMULTIPLY_ALPHA_WEBGL:
-        return WebGLGetInfo(m_unpackPremultiplyAlpha);
-    case GC3D_UNPACK_COLORSPACE_CONVERSION_WEBGL:
-        return WebGLGetInfo(m_unpackColorspaceConversion);
-    case GL_VENDOR:
-        return WebGLGetInfo(String("WebKit"));
-    case GL_VERSION:
-        return WebGLGetInfo("WebGL 1.0 (" + String(m_context->getString(GL_VERSION)) + ")");
-    case GL_VIEWPORT:
-        return getWebGLIntArrayParameter(pname);
-    case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES: // OES_standard_derivatives
-        if (m_oesStandardDerivatives)
-            return getUnsignedIntParameter(GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES);
-        synthesizeGLError(GL_INVALID_ENUM, "getParameter", "invalid parameter name, OES_standard_derivatives not enabled");
-        return WebGLGetInfo();
-    case WebGLDebugRendererInfo::UNMASKED_RENDERER_WEBGL:
-        if (m_webglDebugRendererInfo)
-            return WebGLGetInfo(m_context->getString(GL_RENDERER));
-        synthesizeGLError(GL_INVALID_ENUM, "getParameter", "invalid parameter name, WEBGL_debug_renderer_info not enabled");
-        return WebGLGetInfo();
-    case WebGLDebugRendererInfo::UNMASKED_VENDOR_WEBGL:
-        if (m_webglDebugRendererInfo)
-            return WebGLGetInfo(m_context->getString(GL_VENDOR));
-        synthesizeGLError(GL_INVALID_ENUM, "getParameter", "invalid parameter name, WEBGL_debug_renderer_info not enabled");
-        return WebGLGetInfo();
-    case GL_VERTEX_ARRAY_BINDING_OES: // OES_vertex_array_object
-        if (m_oesVertexArrayObject) {
-            if (!m_boundVertexArrayObject->isDefaultObject())
-                return WebGLGetInfo(PassRefPtr<WebGLVertexArrayObjectOES>(m_boundVertexArrayObject));
-            return WebGLGetInfo();
-        }
-        synthesizeGLError(GL_INVALID_ENUM, "getParameter", "invalid parameter name, OES_vertex_array_object not enabled");
-        return WebGLGetInfo();
-    case GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT: // EXT_texture_filter_anisotropic
-        if (m_extTextureFilterAnisotropic)
-            return getUnsignedIntParameter(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT);
-        synthesizeGLError(GL_INVALID_ENUM, "getParameter", "invalid parameter name, EXT_texture_filter_anisotropic not enabled");
-        return WebGLGetInfo();
-    case GL_MAX_COLOR_ATTACHMENTS_EXT: // EXT_draw_buffers BEGIN
-        if (m_webglDrawBuffers)
-            return WebGLGetInfo(maxColorAttachments());
-        synthesizeGLError(GL_INVALID_ENUM, "getParameter", "invalid parameter name, WEBGL_draw_buffers not enabled");
-        return WebGLGetInfo();
-    case GL_MAX_DRAW_BUFFERS_EXT:
-        if (m_webglDrawBuffers)
-            return WebGLGetInfo(maxDrawBuffers());
-        synthesizeGLError(GL_INVALID_ENUM, "getParameter", "invalid parameter name, WEBGL_draw_buffers not enabled");
-        return WebGLGetInfo();
-    default:
-        if (m_webglDrawBuffers
-            && pname >= GL_DRAW_BUFFER0_EXT
-            && pname < static_cast<GLenum>(GL_DRAW_BUFFER0_EXT + maxDrawBuffers())) {
-            GLint value = GL_NONE;
-            if (m_framebufferBinding)
-                value = m_framebufferBinding->getDrawBuffer(pname);
-            else // emulated backbuffer
-                value = m_backDrawBuffer;
-            return WebGLGetInfo(value);
-        }
-        synthesizeGLError(GL_INVALID_ENUM, "getParameter", "invalid parameter name");
-        return WebGLGetInfo();
-    }
-}
-
-WebGLGetInfo WebGLRenderingContext::getProgramParameter(WebGLProgram* program, GLenum pname)
-{
-    if (isContextLost() || !validateWebGLObject("getProgramParameter", program))
-        return WebGLGetInfo();
-
-    GLint value = 0;
-    switch (pname) {
-    case GL_DELETE_STATUS:
-        return WebGLGetInfo(program->isDeleted());
-    case GL_VALIDATE_STATUS:
-        m_context->getProgramiv(objectOrZero(program), pname, &value);
-        return WebGLGetInfo(static_cast<bool>(value));
-    case GL_LINK_STATUS:
-        return WebGLGetInfo(program->linkStatus());
-    case GL_ATTACHED_SHADERS:
-    case GL_ACTIVE_ATTRIBUTES:
-    case GL_ACTIVE_UNIFORMS:
-        m_context->getProgramiv(objectOrZero(program), pname, &value);
-        return WebGLGetInfo(value);
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "getProgramParameter", "invalid parameter name");
-        return WebGLGetInfo();
-    }
-}
-
-String WebGLRenderingContext::getProgramInfoLog(WebGLProgram* program)
-{
-    if (isContextLost())
-        return String();
-    if (!validateWebGLObject("getProgramInfoLog", program))
-        return "";
-    return ensureNotNull(m_context->getProgramInfoLog(objectOrZero(program)));
-}
-
-WebGLGetInfo WebGLRenderingContext::getRenderbufferParameter(GLenum target, GLenum pname)
-{
-    if (isContextLost())
-        return WebGLGetInfo();
-    if (target != GL_RENDERBUFFER) {
-        synthesizeGLError(GL_INVALID_ENUM, "getRenderbufferParameter", "invalid target");
-        return WebGLGetInfo();
-    }
-    if (!m_renderbufferBinding || !m_renderbufferBinding->object()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "getRenderbufferParameter", "no renderbuffer bound");
-        return WebGLGetInfo();
-    }
-
-    GLint value = 0;
-    switch (pname) {
-    case GL_RENDERBUFFER_WIDTH:
-    case GL_RENDERBUFFER_HEIGHT:
-    case GL_RENDERBUFFER_RED_SIZE:
-    case GL_RENDERBUFFER_GREEN_SIZE:
-    case GL_RENDERBUFFER_BLUE_SIZE:
-    case GL_RENDERBUFFER_ALPHA_SIZE:
-    case GL_RENDERBUFFER_DEPTH_SIZE:
-        m_context->getRenderbufferParameteriv(target, pname, &value);
-        return WebGLGetInfo(value);
-    case GL_RENDERBUFFER_STENCIL_SIZE:
-        if (m_renderbufferBinding->emulatedStencilBuffer()) {
-            m_context->bindRenderbuffer(target, objectOrZero(m_renderbufferBinding->emulatedStencilBuffer()));
-            m_context->getRenderbufferParameteriv(target, pname, &value);
-            m_context->bindRenderbuffer(target, objectOrZero(m_renderbufferBinding.get()));
-        } else {
-            m_context->getRenderbufferParameteriv(target, pname, &value);
-        }
-        return WebGLGetInfo(value);
-    case GL_RENDERBUFFER_INTERNAL_FORMAT:
-        return WebGLGetInfo(m_renderbufferBinding->internalFormat());
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "getRenderbufferParameter", "invalid parameter name");
-        return WebGLGetInfo();
-    }
-}
-
-WebGLGetInfo WebGLRenderingContext::getShaderParameter(WebGLShader* shader, GLenum pname)
-{
-    if (isContextLost() || !validateWebGLObject("getShaderParameter", shader))
-        return WebGLGetInfo();
-    GLint value = 0;
-    switch (pname) {
-    case GL_DELETE_STATUS:
-        return WebGLGetInfo(shader->isDeleted());
-    case GL_COMPILE_STATUS:
-        m_context->getShaderiv(objectOrZero(shader), pname, &value);
-        return WebGLGetInfo(static_cast<bool>(value));
-    case GL_SHADER_TYPE:
-        m_context->getShaderiv(objectOrZero(shader), pname, &value);
-        return WebGLGetInfo(static_cast<unsigned>(value));
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "getShaderParameter", "invalid parameter name");
-        return WebGLGetInfo();
-    }
-}
-
-String WebGLRenderingContext::getShaderInfoLog(WebGLShader* shader)
-{
-    if (isContextLost())
-        return String();
-    if (!validateWebGLObject("getShaderInfoLog", shader))
-        return "";
-    return ensureNotNull(m_context->getShaderInfoLog(objectOrZero(shader)));
-}
-
-PassRefPtr<WebGLShaderPrecisionFormat> WebGLRenderingContext::getShaderPrecisionFormat(GLenum shaderType, GLenum precisionType)
-{
-    if (isContextLost())
-        return 0;
-    switch (shaderType) {
-    case GL_VERTEX_SHADER:
-    case GL_FRAGMENT_SHADER:
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "getShaderPrecisionFormat", "invalid shader type");
-        return 0;
-    }
-    switch (precisionType) {
-    case GL_LOW_FLOAT:
-    case GL_MEDIUM_FLOAT:
-    case GL_HIGH_FLOAT:
-    case GL_LOW_INT:
-    case GL_MEDIUM_INT:
-    case GL_HIGH_INT:
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "getShaderPrecisionFormat", "invalid precision type");
-        return 0;
-    }
-
-    GLint range[2] = {0, 0};
-    GLint precision = 0;
-    m_context->getShaderPrecisionFormat(shaderType, precisionType, range, &precision);
-    return WebGLShaderPrecisionFormat::create(range[0], range[1], precision);
-}
-
-String WebGLRenderingContext::getShaderSource(WebGLShader* shader)
-{
-    if (isContextLost())
-        return String();
-    if (!validateWebGLObject("getShaderSource", shader))
-        return "";
-    return ensureNotNull(shader->source());
-}
-
-Vector<String> WebGLRenderingContext::getSupportedExtensions()
-{
-    Vector<String> result;
-    if (isContextLost())
-        return result;
-
-    for (size_t i = 0; i < m_extensions.size(); ++i) {
-        ExtensionTracker* tracker = m_extensions[i];
-        if (tracker->webglDebugRendererInfo() && !allowWebGLDebugRendererInfo())
-            continue;
-        if (tracker->privileged() && !allowPrivilegedExtensions())
-            continue;
-        if (tracker->draft() && !RuntimeEnabledFeatures::webGLDraftExtensionsEnabled())
-            continue;
-        if (tracker->supported(this))
-            result.append(String(tracker->prefixed()  ? "WEBKIT_" : "") + tracker->extensionName());
-    }
-
-    return result;
-}
-
-WebGLGetInfo WebGLRenderingContext::getTexParameter(GLenum target, GLenum pname)
-{
-    if (isContextLost())
-        return WebGLGetInfo();
-    WebGLTexture* tex = validateTextureBinding("getTexParameter", target, false);
-    if (!tex)
-        return WebGLGetInfo();
-    GLint value = 0;
-    switch (pname) {
-    case GL_TEXTURE_MAG_FILTER:
-    case GL_TEXTURE_MIN_FILTER:
-    case GL_TEXTURE_WRAP_S:
-    case GL_TEXTURE_WRAP_T:
-        m_context->getTexParameteriv(target, pname, &value);
-        return WebGLGetInfo(static_cast<unsigned>(value));
-    case GL_TEXTURE_MAX_ANISOTROPY_EXT: // EXT_texture_filter_anisotropic
-        if (m_extTextureFilterAnisotropic) {
-            m_context->getTexParameteriv(target, pname, &value);
-            return WebGLGetInfo(static_cast<unsigned>(value));
-        }
-        synthesizeGLError(GL_INVALID_ENUM, "getTexParameter", "invalid parameter name, EXT_texture_filter_anisotropic not enabled");
-        return WebGLGetInfo();
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "getTexParameter", "invalid parameter name");
-        return WebGLGetInfo();
-    }
-}
-
-WebGLGetInfo WebGLRenderingContext::getUniform(WebGLProgram* program, const WebGLUniformLocation* uniformLocation)
-{
-    if (isContextLost() || !validateWebGLObject("getUniform", program))
-        return WebGLGetInfo();
-    if (!uniformLocation || uniformLocation->program() != program) {
-        synthesizeGLError(GL_INVALID_OPERATION, "getUniform", "no uniformlocation or not valid for this program");
-        return WebGLGetInfo();
-    }
-    GLint location = uniformLocation->location();
-
-    // FIXME: make this more efficient using WebGLUniformLocation and caching types in it
-    GLint activeUniforms = 0;
-    m_context->getProgramiv(objectOrZero(program), GL_ACTIVE_UNIFORMS, &activeUniforms);
-    for (GLint i = 0; i < activeUniforms; i++) {
-        blink::WebGraphicsContext3D::ActiveInfo info;
-        if (!m_context->getActiveUniform(objectOrZero(program), i, info))
-            return WebGLGetInfo();
-        String name = info.name;
-        StringBuilder nameBuilder;
-        // Strip "[0]" from the name if it's an array.
-        if (info.size > 1 && name.endsWith("[0]"))
-            info.name = name.left(name.length() - 3);
-        // If it's an array, we need to iterate through each element, appending "[index]" to the name.
-        for (GLint index = 0; index < info.size; ++index) {
-            nameBuilder.clear();
-            nameBuilder.append(info.name);
-            if (info.size > 1 && index >= 1) {
-                nameBuilder.append('[');
-                nameBuilder.append(String::number(index));
-                nameBuilder.append(']');
-            }
-            // Now need to look this up by name again to find its location
-            GLint loc = m_context->getUniformLocation(objectOrZero(program), nameBuilder.toString().utf8().data());
-            if (loc == location) {
-                // Found it. Use the type in the ActiveInfo to determine the return type.
-                GLenum baseType;
-                unsigned length;
-                switch (info.type) {
-                case GL_BOOL:
-                    baseType = GL_BOOL;
-                    length = 1;
-                    break;
-                case GL_BOOL_VEC2:
-                    baseType = GL_BOOL;
-                    length = 2;
-                    break;
-                case GL_BOOL_VEC3:
-                    baseType = GL_BOOL;
-                    length = 3;
-                    break;
-                case GL_BOOL_VEC4:
-                    baseType = GL_BOOL;
-                    length = 4;
-                    break;
-                case GL_INT:
-                    baseType = GL_INT;
-                    length = 1;
-                    break;
-                case GL_INT_VEC2:
-                    baseType = GL_INT;
-                    length = 2;
-                    break;
-                case GL_INT_VEC3:
-                    baseType = GL_INT;
-                    length = 3;
-                    break;
-                case GL_INT_VEC4:
-                    baseType = GL_INT;
-                    length = 4;
-                    break;
-                case GL_FLOAT:
-                    baseType = GL_FLOAT;
-                    length = 1;
-                    break;
-                case GL_FLOAT_VEC2:
-                    baseType = GL_FLOAT;
-                    length = 2;
-                    break;
-                case GL_FLOAT_VEC3:
-                    baseType = GL_FLOAT;
-                    length = 3;
-                    break;
-                case GL_FLOAT_VEC4:
-                    baseType = GL_FLOAT;
-                    length = 4;
-                    break;
-                case GL_FLOAT_MAT2:
-                    baseType = GL_FLOAT;
-                    length = 4;
-                    break;
-                case GL_FLOAT_MAT3:
-                    baseType = GL_FLOAT;
-                    length = 9;
-                    break;
-                case GL_FLOAT_MAT4:
-                    baseType = GL_FLOAT;
-                    length = 16;
-                    break;
-                case GL_SAMPLER_2D:
-                case GL_SAMPLER_CUBE:
-                    baseType = GL_INT;
-                    length = 1;
-                    break;
-                default:
-                    // Can't handle this type
-                    synthesizeGLError(GL_INVALID_VALUE, "getUniform", "unhandled type");
-                    return WebGLGetInfo();
-                }
-                switch (baseType) {
-                case GL_FLOAT: {
-                    GLfloat value[16] = {0};
-                    m_context->getUniformfv(objectOrZero(program), location, value);
-                    if (length == 1)
-                        return WebGLGetInfo(value[0]);
-                    return WebGLGetInfo(Float32Array::create(value, length));
-                }
-                case GL_INT: {
-                    GLint value[4] = {0};
-                    m_context->getUniformiv(objectOrZero(program), location, value);
-                    if (length == 1)
-                        return WebGLGetInfo(value[0]);
-                    return WebGLGetInfo(Int32Array::create(value, length));
-                }
-                case GL_BOOL: {
-                    GLint value[4] = {0};
-                    m_context->getUniformiv(objectOrZero(program), location, value);
-                    if (length > 1) {
-                        bool boolValue[16] = {0};
-                        for (unsigned j = 0; j < length; j++)
-                            boolValue[j] = static_cast<bool>(value[j]);
-                        return WebGLGetInfo(boolValue, length);
-                    }
-                    return WebGLGetInfo(static_cast<bool>(value[0]));
-                }
-                default:
-                    notImplemented();
-                }
-            }
-        }
-    }
-    // If we get here, something went wrong in our unfortunately complex logic above
-    synthesizeGLError(GL_INVALID_VALUE, "getUniform", "unknown error");
-    return WebGLGetInfo();
-}
-
-PassRefPtr<WebGLUniformLocation> WebGLRenderingContext::getUniformLocation(WebGLProgram* program, const String& name)
-{
-    if (isContextLost() || !validateWebGLObject("getUniformLocation", program))
-        return 0;
-    if (!validateLocationLength("getUniformLocation", name))
-        return 0;
-    if (!validateString("getUniformLocation", name))
-        return 0;
-    if (isPrefixReserved(name))
-        return 0;
-    if (!program->linkStatus()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "getUniformLocation", "program not linked");
-        return 0;
-    }
-    GLint uniformLocation = m_context->getUniformLocation(objectOrZero(program), name.utf8().data());
-    if (uniformLocation == -1)
-        return 0;
-    return WebGLUniformLocation::create(program, uniformLocation);
-}
-
-WebGLGetInfo WebGLRenderingContext::getVertexAttrib(GLuint index, GLenum pname)
-{
-    if (isContextLost())
-        return WebGLGetInfo();
-    if (index >= m_maxVertexAttribs) {
-        synthesizeGLError(GL_INVALID_VALUE, "getVertexAttrib", "index out of range");
-        return WebGLGetInfo();
-    }
-    const WebGLVertexArrayObjectOES::VertexAttribState& state = m_boundVertexArrayObject->getVertexAttribState(index);
-
-    if (m_angleInstancedArrays && pname == GL_VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE)
-        return WebGLGetInfo(state.divisor);
-
-    switch (pname) {
-    case GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING:
-        if (!state.bufferBinding || !state.bufferBinding->object())
-            return WebGLGetInfo();
-        return WebGLGetInfo(PassRefPtr<WebGLBuffer>(state.bufferBinding));
-    case GL_VERTEX_ATTRIB_ARRAY_ENABLED:
-        return WebGLGetInfo(state.enabled);
-    case GL_VERTEX_ATTRIB_ARRAY_NORMALIZED:
-        return WebGLGetInfo(state.normalized);
-    case GL_VERTEX_ATTRIB_ARRAY_SIZE:
-        return WebGLGetInfo(state.size);
-    case GL_VERTEX_ATTRIB_ARRAY_STRIDE:
-        return WebGLGetInfo(state.originalStride);
-    case GL_VERTEX_ATTRIB_ARRAY_TYPE:
-        return WebGLGetInfo(state.type);
-    case GL_CURRENT_VERTEX_ATTRIB:
-        return WebGLGetInfo(Float32Array::create(m_vertexAttribValue[index].value, 4));
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "getVertexAttrib", "invalid parameter name");
-        return WebGLGetInfo();
-    }
-}
-
-long long WebGLRenderingContext::getVertexAttribOffset(GLuint index, GLenum pname)
-{
-    if (isContextLost())
-        return 0;
-    if (pname != GL_VERTEX_ATTRIB_ARRAY_POINTER) {
-        synthesizeGLError(GL_INVALID_ENUM, "getVertexAttribOffset", "invalid parameter name");
-        return 0;
-    }
-    GLsizeiptr result = m_context->getVertexAttribOffset(index, pname);
-    return static_cast<long long>(result);
-}
-
-void WebGLRenderingContext::hint(GLenum target, GLenum mode)
-{
-    if (isContextLost())
-        return;
-    bool isValid = false;
-    switch (target) {
-    case GL_GENERATE_MIPMAP_HINT:
-        isValid = true;
-        break;
-    case GL_FRAGMENT_SHADER_DERIVATIVE_HINT_OES: // OES_standard_derivatives
-        if (m_oesStandardDerivatives)
-            isValid = true;
-        break;
-    }
-    if (!isValid) {
-        synthesizeGLError(GL_INVALID_ENUM, "hint", "invalid target");
-        return;
-    }
-    m_context->hint(target, mode);
-}
-
-GLboolean WebGLRenderingContext::isBuffer(WebGLBuffer* buffer)
-{
-    if (!buffer || isContextLost())
-        return 0;
-
-    if (!buffer->hasEverBeenBound())
-        return 0;
-
-    return m_context->isBuffer(buffer->object());
-}
-
-bool WebGLRenderingContext::isContextLost()
-{
-    return m_contextLost;
-}
-
-GLboolean WebGLRenderingContext::isEnabled(GLenum cap)
-{
-    if (isContextLost() || !validateCapability("isEnabled", cap))
-        return 0;
-    if (cap == GL_STENCIL_TEST)
-        return m_stencilEnabled;
-    return m_context->isEnabled(cap);
-}
-
-GLboolean WebGLRenderingContext::isFramebuffer(WebGLFramebuffer* framebuffer)
-{
-    if (!framebuffer || isContextLost())
-        return 0;
-
-    if (!framebuffer->hasEverBeenBound())
-        return 0;
-
-    return m_context->isFramebuffer(framebuffer->object());
-}
-
-GLboolean WebGLRenderingContext::isProgram(WebGLProgram* program)
-{
-    if (!program || isContextLost())
-        return 0;
-
-    return m_context->isProgram(program->object());
-}
-
-GLboolean WebGLRenderingContext::isRenderbuffer(WebGLRenderbuffer* renderbuffer)
-{
-    if (!renderbuffer || isContextLost())
-        return 0;
-
-    if (!renderbuffer->hasEverBeenBound())
-        return 0;
-
-    return m_context->isRenderbuffer(renderbuffer->object());
-}
-
-GLboolean WebGLRenderingContext::isShader(WebGLShader* shader)
-{
-    if (!shader || isContextLost())
-        return 0;
-
-    return m_context->isShader(shader->object());
-}
-
-GLboolean WebGLRenderingContext::isTexture(WebGLTexture* texture)
-{
-    if (!texture || isContextLost())
-        return 0;
-
-    if (!texture->hasEverBeenBound())
-        return 0;
-
-    return m_context->isTexture(texture->object());
-}
-
-void WebGLRenderingContext::lineWidth(GLfloat width)
-{
-    if (isContextLost())
-        return;
-    m_context->lineWidth(width);
-}
-
-void WebGLRenderingContext::linkProgram(WebGLProgram* program)
-{
-    if (isContextLost() || !validateWebGLObject("linkProgram", program))
-        return;
-
-    m_context->linkProgram(objectOrZero(program));
-    program->increaseLinkCount();
-}
-
-void WebGLRenderingContext::pixelStorei(GLenum pname, GLint param)
-{
-    if (isContextLost())
-        return;
-    switch (pname) {
-    case GC3D_UNPACK_FLIP_Y_WEBGL:
-        m_unpackFlipY = param;
-        break;
-    case GC3D_UNPACK_PREMULTIPLY_ALPHA_WEBGL:
-        m_unpackPremultiplyAlpha = param;
-        break;
-    case GC3D_UNPACK_COLORSPACE_CONVERSION_WEBGL:
-        if (static_cast<GLenum>(param) == GC3D_BROWSER_DEFAULT_WEBGL || param == GL_NONE) {
-            m_unpackColorspaceConversion = static_cast<GLenum>(param);
-        } else {
-            synthesizeGLError(GL_INVALID_VALUE, "pixelStorei", "invalid parameter for UNPACK_COLORSPACE_CONVERSION_WEBGL");
-            return;
-        }
-        break;
-    case GL_PACK_ALIGNMENT:
-    case GL_UNPACK_ALIGNMENT:
-        if (param == 1 || param == 2 || param == 4 || param == 8) {
-            if (pname == GL_PACK_ALIGNMENT) {
-                m_packAlignment = param;
-                m_drawingBuffer->setPackAlignment(param);
-            } else { // GL_UNPACK_ALIGNMENT:
-                m_unpackAlignment = param;
-            }
-            m_context->pixelStorei(pname, param);
-        } else {
-            synthesizeGLError(GL_INVALID_VALUE, "pixelStorei", "invalid parameter for alignment");
-            return;
-        }
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "pixelStorei", "invalid parameter name");
-        return;
-    }
-}
-
-void WebGLRenderingContext::polygonOffset(GLfloat factor, GLfloat units)
-{
-    if (isContextLost())
-        return;
-    m_context->polygonOffset(factor, units);
-}
-
-void WebGLRenderingContext::readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, ArrayBufferView* pixels)
-{
-    if (isContextLost())
-        return;
-    // Due to WebGL's same-origin restrictions, it is not possible to
-    // taint the origin using the WebGL API.
-    ASSERT(canvas()->originClean());
-    // Validate input parameters.
-    if (!pixels) {
-        synthesizeGLError(GL_INVALID_VALUE, "readPixels", "no destination ArrayBufferView");
-        return;
-    }
-    switch (format) {
-    case GL_ALPHA:
-    case GL_RGB:
-    case GL_RGBA:
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "readPixels", "invalid format");
-        return;
-    }
-    switch (type) {
-    case GL_UNSIGNED_BYTE:
-    case GL_UNSIGNED_SHORT_5_6_5:
-    case GL_UNSIGNED_SHORT_4_4_4_4:
-    case GL_UNSIGNED_SHORT_5_5_5_1:
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "readPixels", "invalid type");
-        return;
-    }
-    if (format != GL_RGBA || type != GL_UNSIGNED_BYTE) {
-        synthesizeGLError(GL_INVALID_OPERATION, "readPixels", "format not RGBA or type not UNSIGNED_BYTE");
-        return;
-    }
-    // Validate array type against pixel type.
-    if (pixels->type() != ArrayBufferView::TypeUint8) {
-        synthesizeGLError(GL_INVALID_OPERATION, "readPixels", "ArrayBufferView not Uint8Array");
-        return;
-    }
-    const char* reason = "framebuffer incomplete";
-    if (m_framebufferBinding && !m_framebufferBinding->onAccess(m_context.get(), &reason)) {
-        synthesizeGLError(GL_INVALID_FRAMEBUFFER_OPERATION, "readPixels", reason);
-        return;
-    }
-    // Calculate array size, taking into consideration of PACK_ALIGNMENT.
-    unsigned totalBytesRequired = 0;
-    unsigned padding = 0;
-    GLenum error = WebGLImageConversion::computeImageSizeInBytes(format, type, width, height, m_packAlignment, &totalBytesRequired, &padding);
-    if (error != GL_NO_ERROR) {
-        synthesizeGLError(error, "readPixels", "invalid dimensions");
-        return;
-    }
-    if (pixels->byteLength() < totalBytesRequired) {
-        synthesizeGLError(GL_INVALID_OPERATION, "readPixels", "ArrayBufferView not large enough for dimensions");
-        return;
-    }
-
-    clearIfComposited();
-    void* data = pixels->baseAddress();
-
-    {
-        ScopedDrawingBufferBinder binder(m_drawingBuffer.get(), m_framebufferBinding.get());
-        m_context->readPixels(x, y, width, height, format, type, data);
-    }
-
-#if OS(MACOSX)
-    // FIXME: remove this section when GL driver bug on Mac is fixed, i.e.,
-    // when alpha is off, readPixels should set alpha to 255 instead of 0.
-    if (!m_framebufferBinding && !m_context->getContextAttributes().alpha) {
-        unsigned char* pixels = reinterpret_cast<unsigned char*>(data);
-        for (GLsizei iy = 0; iy < height; ++iy) {
-            for (GLsizei ix = 0; ix < width; ++ix) {
-                pixels[3] = 255;
-                pixels += 4;
-            }
-            pixels += padding;
-        }
-    }
-#endif
-}
-
-void WebGLRenderingContext::renderbufferStorage(GLenum target, GLenum internalformat, GLsizei width, GLsizei height)
-{
-    if (isContextLost())
-        return;
-    if (target != GL_RENDERBUFFER) {
-        synthesizeGLError(GL_INVALID_ENUM, "renderbufferStorage", "invalid target");
-        return;
-    }
-    if (!m_renderbufferBinding || !m_renderbufferBinding->object()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "renderbufferStorage", "no bound renderbuffer");
-        return;
-    }
-    if (!validateSize("renderbufferStorage", width, height))
-        return;
-    switch (internalformat) {
-    case GL_DEPTH_COMPONENT16:
-    case GL_RGBA4:
-    case GL_RGB5_A1:
-    case GL_RGB565:
-    case GL_STENCIL_INDEX8:
-        m_context->renderbufferStorage(target, internalformat, width, height);
-        m_renderbufferBinding->setInternalFormat(internalformat);
-        m_renderbufferBinding->setSize(width, height);
-        m_renderbufferBinding->deleteEmulatedStencilBuffer(m_context.get());
-        break;
-    case GL_DEPTH_STENCIL_OES:
-        if (isDepthStencilSupported()) {
-            m_context->renderbufferStorage(target, GL_DEPTH24_STENCIL8_OES, width, height);
-        } else {
-            WebGLRenderbuffer* emulatedStencilBuffer = ensureEmulatedStencilBuffer(target, m_renderbufferBinding.get());
-            if (!emulatedStencilBuffer) {
-                synthesizeGLError(GL_OUT_OF_MEMORY, "renderbufferStorage", "out of memory");
-                return;
-            }
-            m_context->renderbufferStorage(target, GL_DEPTH_COMPONENT16, width, height);
-            m_context->bindRenderbuffer(target, objectOrZero(emulatedStencilBuffer));
-            m_context->renderbufferStorage(target, GL_STENCIL_INDEX8, width, height);
-            m_context->bindRenderbuffer(target, objectOrZero(m_renderbufferBinding.get()));
-            emulatedStencilBuffer->setSize(width, height);
-            emulatedStencilBuffer->setInternalFormat(GL_STENCIL_INDEX8);
-        }
-        m_renderbufferBinding->setSize(width, height);
-        m_renderbufferBinding->setInternalFormat(internalformat);
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "renderbufferStorage", "invalid internalformat");
-        return;
-    }
-    applyStencilTest();
-}
-
-void WebGLRenderingContext::sampleCoverage(GLfloat value, GLboolean invert)
-{
-    if (isContextLost())
-        return;
-    m_context->sampleCoverage(value, invert);
-}
-
-void WebGLRenderingContext::scissor(GLint x, GLint y, GLsizei width, GLsizei height)
-{
-    if (isContextLost())
-        return;
-    if (!validateSize("scissor", width, height))
-        return;
-    m_context->scissor(x, y, width, height);
-}
-
-void WebGLRenderingContext::shaderSource(WebGLShader* shader, const String& string)
-{
-    if (isContextLost() || !validateWebGLObject("shaderSource", shader))
-        return;
-    String stringWithoutComments = StripComments(string).result();
-    if (!validateString("shaderSource", stringWithoutComments))
-        return;
-    shader->setSource(string);
-    m_context->shaderSource(objectOrZero(shader), stringWithoutComments.utf8().data());
-}
-
-void WebGLRenderingContext::stencilFunc(GLenum func, GLint ref, GLuint mask)
-{
-    if (isContextLost())
-        return;
-    if (!validateStencilOrDepthFunc("stencilFunc", func))
-        return;
-    m_stencilFuncRef = ref;
-    m_stencilFuncRefBack = ref;
-    m_stencilFuncMask = mask;
-    m_stencilFuncMaskBack = mask;
-    m_context->stencilFunc(func, ref, mask);
-}
-
-void WebGLRenderingContext::stencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask)
-{
-    if (isContextLost())
-        return;
-    if (!validateStencilOrDepthFunc("stencilFuncSeparate", func))
-        return;
-    switch (face) {
-    case GL_FRONT_AND_BACK:
-        m_stencilFuncRef = ref;
-        m_stencilFuncRefBack = ref;
-        m_stencilFuncMask = mask;
-        m_stencilFuncMaskBack = mask;
-        break;
-    case GL_FRONT:
-        m_stencilFuncRef = ref;
-        m_stencilFuncMask = mask;
-        break;
-    case GL_BACK:
-        m_stencilFuncRefBack = ref;
-        m_stencilFuncMaskBack = mask;
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "stencilFuncSeparate", "invalid face");
-        return;
-    }
-    m_context->stencilFuncSeparate(face, func, ref, mask);
-}
-
-void WebGLRenderingContext::stencilMask(GLuint mask)
-{
-    if (isContextLost())
-        return;
-    m_stencilMask = mask;
-    m_stencilMaskBack = mask;
-    m_context->stencilMask(mask);
-}
-
-void WebGLRenderingContext::stencilMaskSeparate(GLenum face, GLuint mask)
-{
-    if (isContextLost())
-        return;
-    switch (face) {
-    case GL_FRONT_AND_BACK:
-        m_stencilMask = mask;
-        m_stencilMaskBack = mask;
-        break;
-    case GL_FRONT:
-        m_stencilMask = mask;
-        break;
-    case GL_BACK:
-        m_stencilMaskBack = mask;
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "stencilMaskSeparate", "invalid face");
-        return;
-    }
-    m_context->stencilMaskSeparate(face, mask);
-}
-
-void WebGLRenderingContext::stencilOp(GLenum fail, GLenum zfail, GLenum zpass)
-{
-    if (isContextLost())
-        return;
-    m_context->stencilOp(fail, zfail, zpass);
-}
-
-void WebGLRenderingContext::stencilOpSeparate(GLenum face, GLenum fail, GLenum zfail, GLenum zpass)
-{
-    if (isContextLost())
-        return;
-    m_context->stencilOpSeparate(face, fail, zfail, zpass);
-}
-
-GLenum WebGLRenderingContext::convertTexInternalFormat(GLenum internalformat, GLenum type)
-{
-    // Convert to sized internal formats that are renderable with GL_CHROMIUM_color_buffer_float_rgb(a).
-    if (type == GL_FLOAT && internalformat == GL_RGBA
-        && extensionsUtil()->isExtensionEnabled("GL_CHROMIUM_color_buffer_float_rgba"))
-        return GL_RGBA32F_EXT;
-    if (type == GL_FLOAT && internalformat == GL_RGB
-        && extensionsUtil()->isExtensionEnabled("GL_CHROMIUM_color_buffer_float_rgb"))
-        return GL_RGB32F_EXT;
-    return internalformat;
-}
-
-void WebGLRenderingContext::texImage2DBase(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const void* pixels, ExceptionState& exceptionState)
-{
-    // All calling functions check isContextLost, so a duplicate check is not needed here.
-    // FIXME: Handle errors.
-    WebGLTexture* tex = validateTextureBinding("texImage2D", target, true);
-    ASSERT(validateTexFuncParameters("texImage2D", NotTexSubImage2D, target, level, internalformat, width, height, border, format, type));
-    ASSERT(tex);
-    ASSERT(!level || !WebGLTexture::isNPOT(width, height));
-    ASSERT(!pixels || validateSettableTexFormat("texImage2D", internalformat));
-    m_context->texImage2D(target, level, convertTexInternalFormat(internalformat, type), width, height, border, format, type, pixels);
-    tex->setLevelInfo(target, level, internalformat, width, height, type);
-}
-
-void WebGLRenderingContext::texImage2DImpl(GLenum target, GLint level, GLenum internalformat, GLenum format, GLenum type, Image* image, WebGLImageConversion::ImageHtmlDomSource domSource, bool flipY, bool premultiplyAlpha, ExceptionState& exceptionState)
-{
-    // All calling functions check isContextLost, so a duplicate check is not needed here.
-    Vector<uint8_t> data;
-    WebGLImageConversion::ImageExtractor imageExtractor(image, domSource, premultiplyAlpha, m_unpackColorspaceConversion == GL_NONE);
-    if (!imageExtractor.extractSucceeded()) {
-        synthesizeGLError(GL_INVALID_VALUE, "texImage2D", "bad image data");
-        return;
-    }
-    WebGLImageConversion::DataFormat sourceDataFormat = imageExtractor.imageSourceFormat();
-    WebGLImageConversion::AlphaOp alphaOp = imageExtractor.imageAlphaOp();
-    const void* imagePixelData = imageExtractor.imagePixelData();
-
-    bool needConversion = true;
-    if (type == GL_UNSIGNED_BYTE && sourceDataFormat == WebGLImageConversion::DataFormatRGBA8 && format == GL_RGBA && alphaOp == WebGLImageConversion::AlphaDoNothing && !flipY)
-        needConversion = false;
-    else {
-        if (!WebGLImageConversion::packImageData(image, imagePixelData, format, type, flipY, alphaOp, sourceDataFormat, imageExtractor.imageWidth(), imageExtractor.imageHeight(), imageExtractor.imageSourceUnpackAlignment(), data)) {
-            synthesizeGLError(GL_INVALID_VALUE, "texImage2D", "packImage error");
-            return;
-        }
-    }
-
-    if (m_unpackAlignment != 1)
-        m_context->pixelStorei(GL_UNPACK_ALIGNMENT, 1);
-    texImage2DBase(target, level, internalformat, image->width(), image->height(), 0, format, type, needConversion ? data.data() : imagePixelData, exceptionState);
-    if (m_unpackAlignment != 1)
-        m_context->pixelStorei(GL_UNPACK_ALIGNMENT, m_unpackAlignment);
-}
-
-bool WebGLRenderingContext::validateTexFunc(const char* functionName, TexFuncValidationFunctionType functionType, TexFuncValidationSourceType sourceType, GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, GLint xoffset, GLint yoffset)
-{
-    if (!validateTexFuncParameters(functionName, functionType, target, level, internalformat, width, height, border, format, type))
-        return false;
-
-    WebGLTexture* texture = validateTextureBinding(functionName, target, true);
-    if (!texture)
-        return false;
-
-    if (functionType == NotTexSubImage2D) {
-        if (level && WebGLTexture::isNPOT(width, height)) {
-            synthesizeGLError(GL_INVALID_VALUE, functionName, "level > 0 not power of 2");
-            return false;
-        }
-        // For SourceArrayBufferView, function validateTexFuncData() would handle whether to validate the SettableTexFormat
-        // by checking if the ArrayBufferView is null or not.
-        if (sourceType != SourceArrayBufferView) {
-            if (!validateSettableTexFormat(functionName, format))
-                return false;
-        }
-    } else {
-        if (!validateSettableTexFormat(functionName, format))
-            return false;
-        if (!validateSize(functionName, xoffset, yoffset))
-            return false;
-        // Before checking if it is in the range, check if overflow happens first.
-        if (xoffset + width < 0 || yoffset + height < 0) {
-            synthesizeGLError(GL_INVALID_VALUE, functionName, "bad dimensions");
-            return false;
-        }
-        if (xoffset + width > texture->getWidth(target, level) || yoffset + height > texture->getHeight(target, level)) {
-            synthesizeGLError(GL_INVALID_VALUE, functionName, "dimensions out of range");
-            return false;
-        }
-        if (texture->getInternalFormat(target, level) != format || texture->getType(target, level) != type) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "type and format do not match texture");
-            return false;
-        }
-    }
-
-    return true;
-}
-
-PassRefPtr<Image> WebGLRenderingContext::drawImageIntoBuffer(Image* image, int width, int height)
-{
-    IntSize size(width, height);
-    ImageBuffer* buf = m_generatedImageCache.imageBuffer(size);
-    if (!buf) {
-        synthesizeGLError(GL_OUT_OF_MEMORY, "texImage2D", "out of memory");
-        return 0;
-    }
-
-    IntRect srcRect(IntPoint(), image->size());
-    IntRect destRect(0, 0, size.width(), size.height());
-    buf->context()->drawImage(image, destRect, srcRect);
-    return buf->copyImage(ImageBuffer::fastCopyImageMode());
-}
-
-void WebGLRenderingContext::texImage2D(GLenum target, GLint level, GLenum internalformat,
-    GLsizei width, GLsizei height, GLint border,
-    GLenum format, GLenum type, ArrayBufferView* pixels, ExceptionState& exceptionState)
-{
-    if (isContextLost() || !validateTexFuncData("texImage2D", level, width, height, format, type, pixels, NullAllowed)
-        || !validateTexFunc("texImage2D", NotTexSubImage2D, SourceArrayBufferView, target, level, internalformat, width, height, border, format, type, 0, 0))
-        return;
-    void* data = pixels ? pixels->baseAddress() : 0;
-    Vector<uint8_t> tempData;
-    bool changeUnpackAlignment = false;
-    if (data && (m_unpackFlipY || m_unpackPremultiplyAlpha)) {
-        if (!WebGLImageConversion::extractTextureData(width, height, format, type, m_unpackAlignment, m_unpackFlipY, m_unpackPremultiplyAlpha, data, tempData))
-            return;
-        data = tempData.data();
-        changeUnpackAlignment = true;
-    }
-    if (changeUnpackAlignment)
-        m_context->pixelStorei(GL_UNPACK_ALIGNMENT, 1);
-    texImage2DBase(target, level, internalformat, width, height, border, format, type, data, exceptionState);
-    if (changeUnpackAlignment)
-        m_context->pixelStorei(GL_UNPACK_ALIGNMENT, m_unpackAlignment);
-}
-
-void WebGLRenderingContext::texImage2D(GLenum target, GLint level, GLenum internalformat,
-    GLenum format, GLenum type, ImageData* pixels, ExceptionState& exceptionState)
-{
-    if (isContextLost() || !pixels || !validateTexFunc("texImage2D", NotTexSubImage2D, SourceImageData, target, level, internalformat, pixels->width(), pixels->height(), 0, format, type, 0, 0))
-        return;
-    Vector<uint8_t> data;
-    bool needConversion = true;
-    // The data from ImageData is always of format RGBA8.
-    // No conversion is needed if destination format is RGBA and type is USIGNED_BYTE and no Flip or Premultiply operation is required.
-    if (!m_unpackFlipY && !m_unpackPremultiplyAlpha && format == GL_RGBA && type == GL_UNSIGNED_BYTE)
-        needConversion = false;
-    else {
-        if (!WebGLImageConversion::extractImageData(pixels->data()->data(), pixels->size(), format, type, m_unpackFlipY, m_unpackPremultiplyAlpha, data)) {
-            synthesizeGLError(GL_INVALID_VALUE, "texImage2D", "bad image data");
-            return;
-        }
-    }
-    if (m_unpackAlignment != 1)
-        m_context->pixelStorei(GL_UNPACK_ALIGNMENT, 1);
-    texImage2DBase(target, level, internalformat, pixels->width(), pixels->height(), 0, format, type, needConversion ? data.data() : pixels->data()->data(), exceptionState);
-    if (m_unpackAlignment != 1)
-        m_context->pixelStorei(GL_UNPACK_ALIGNMENT, m_unpackAlignment);
-}
-
-void WebGLRenderingContext::texImage2D(GLenum target, GLint level, GLenum internalformat,
-    GLenum format, GLenum type, HTMLImageElement* image, ExceptionState& exceptionState)
-{
-    if (isContextLost() || !validateHTMLImageElement("texImage2D", image, exceptionState))
-        return;
-
-    RefPtr<Image> imageForRender = image->cachedImage()->imageForRenderer(image->renderer());
-    if (imageForRender->isSVGImage())
-        imageForRender = drawImageIntoBuffer(imageForRender.get(), image->width(), image->height());
-
-    if (!imageForRender || !validateTexFunc("texImage2D", NotTexSubImage2D, SourceHTMLImageElement, target, level, internalformat, imageForRender->width(), imageForRender->height(), 0, format, type, 0, 0))
-        return;
-
-    texImage2DImpl(target, level, internalformat, format, type, imageForRender.get(), WebGLImageConversion::HtmlDomImage, m_unpackFlipY, m_unpackPremultiplyAlpha, exceptionState);
-}
-
-void WebGLRenderingContext::texImage2D(GLenum target, GLint level, GLenum internalformat,
-    GLenum format, GLenum type, HTMLCanvasElement* canvas, ExceptionState& exceptionState)
-{
-    if (isContextLost() || !validateHTMLCanvasElement("texImage2D", canvas, exceptionState) || !validateTexFunc("texImage2D", NotTexSubImage2D, SourceHTMLCanvasElement, target, level, internalformat, canvas->width(), canvas->height(), 0, format, type, 0, 0))
-        return;
-
-    WebGLTexture* texture = validateTextureBinding("texImage2D", target, true);
-    // If possible, copy from the canvas element directly to the texture
-    // via the GPU, without a read-back to system memory.
-    if (GL_TEXTURE_2D == target && texture) {
-        if (!canvas->is3D()) {
-            ImageBuffer* buffer = canvas->buffer();
-            if (buffer && buffer->copyToPlatformTexture(m_context.get(), texture->object(), internalformat, type,
-                level, m_unpackPremultiplyAlpha, m_unpackFlipY)) {
-                texture->setLevelInfo(target, level, internalformat, canvas->width(), canvas->height(), type);
-                return;
-            }
-        } else {
-            WebGLRenderingContext* gl = toWebGLRenderingContext(canvas->renderingContext());
-            if (gl && gl->m_drawingBuffer->copyToPlatformTexture(m_context.get(), texture->object(), internalformat, type,
-                level, m_unpackPremultiplyAlpha, m_unpackFlipY)) {
-                texture->setLevelInfo(target, level, internalformat, canvas->width(), canvas->height(), type);
-                return;
-            }
-        }
-    }
-
-    RefPtr<ImageData> imageData = canvas->getImageData();
-    if (imageData)
-        texImage2D(target, level, internalformat, format, type, imageData.get(), exceptionState);
-    else
-        texImage2DImpl(target, level, internalformat, format, type, canvas->copiedImage(), WebGLImageConversion::HtmlDomCanvas, m_unpackFlipY, m_unpackPremultiplyAlpha, exceptionState);
-}
-
-PassRefPtr<Image> WebGLRenderingContext::videoFrameToImage(HTMLVideoElement* video, BackingStoreCopy backingStoreCopy)
-{
-    IntSize size(video->videoWidth(), video->videoHeight());
-    ImageBuffer* buf = m_generatedImageCache.imageBuffer(size);
-    if (!buf) {
-        synthesizeGLError(GL_OUT_OF_MEMORY, "texImage2D", "out of memory");
-        return 0;
-    }
-    IntRect destRect(0, 0, size.width(), size.height());
-    // FIXME: Turn this into a GPU-GPU texture copy instead of CPU readback.
-    video->paintCurrentFrameInContext(buf->context(), destRect);
-    return buf->copyImage(backingStoreCopy);
-}
-
-void WebGLRenderingContext::texImage2D(GLenum target, GLint level, GLenum internalformat,
-    GLenum format, GLenum type, HTMLVideoElement* video, ExceptionState& exceptionState)
-{
-    if (isContextLost() || !validateHTMLVideoElement("texImage2D", video, exceptionState)
-        || !validateTexFunc("texImage2D", NotTexSubImage2D, SourceHTMLVideoElement, target, level, internalformat, video->videoWidth(), video->videoHeight(), 0, format, type, 0, 0))
-        return;
-
-    // Go through the fast path doing a GPU-GPU textures copy without a readback to system memory if possible.
-    // Otherwise, it will fall back to the normal SW path.
-    WebGLTexture* texture = validateTextureBinding("texImage2D", target, true);
-    if (GL_TEXTURE_2D == target && texture) {
-        if (video->copyVideoTextureToPlatformTexture(m_context.get(), texture->object(), level, type, internalformat, m_unpackPremultiplyAlpha, m_unpackFlipY)) {
-            texture->setLevelInfo(target, level, internalformat, video->videoWidth(), video->videoHeight(), type);
-            return;
-        }
-    }
-
-    // Normal pure SW path.
-    RefPtr<Image> image = videoFrameToImage(video, ImageBuffer::fastCopyImageMode());
-    if (!image)
-        return;
-    texImage2DImpl(target, level, internalformat, format, type, image.get(), WebGLImageConversion::HtmlDomVideo, m_unpackFlipY, m_unpackPremultiplyAlpha, exceptionState);
-}
-
-void WebGLRenderingContext::texParameter(GLenum target, GLenum pname, GLfloat paramf, GLint parami, bool isFloat)
-{
-    if (isContextLost())
-        return;
-    WebGLTexture* tex = validateTextureBinding("texParameter", target, false);
-    if (!tex)
-        return;
-    switch (pname) {
-    case GL_TEXTURE_MIN_FILTER:
-    case GL_TEXTURE_MAG_FILTER:
-        break;
-    case GL_TEXTURE_WRAP_S:
-    case GL_TEXTURE_WRAP_T:
-        if ((isFloat && paramf != GL_CLAMP_TO_EDGE && paramf != GL_MIRRORED_REPEAT && paramf != GL_REPEAT)
-            || (!isFloat && parami != GL_CLAMP_TO_EDGE && parami != GL_MIRRORED_REPEAT && parami != GL_REPEAT)) {
-            synthesizeGLError(GL_INVALID_ENUM, "texParameter", "invalid parameter");
-            return;
-        }
-        break;
-    case GL_TEXTURE_MAX_ANISOTROPY_EXT: // EXT_texture_filter_anisotropic
-        if (!m_extTextureFilterAnisotropic) {
-            synthesizeGLError(GL_INVALID_ENUM, "texParameter", "invalid parameter, EXT_texture_filter_anisotropic not enabled");
-            return;
-        }
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "texParameter", "invalid parameter name");
-        return;
-    }
-    if (isFloat) {
-        tex->setParameterf(pname, paramf);
-        m_context->texParameterf(target, pname, paramf);
-    } else {
-        tex->setParameteri(pname, parami);
-        m_context->texParameteri(target, pname, parami);
-    }
-}
-
-void WebGLRenderingContext::texParameterf(GLenum target, GLenum pname, GLfloat param)
-{
-    texParameter(target, pname, param, 0, true);
-}
-
-void WebGLRenderingContext::texParameteri(GLenum target, GLenum pname, GLint param)
-{
-    texParameter(target, pname, 0, param, false);
-}
-
-void WebGLRenderingContext::texSubImage2DBase(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const void* pixels, ExceptionState& exceptionState)
-{
-    // FIXME: Handle errors.
-    ASSERT(!isContextLost());
-    ASSERT(validateTexFuncParameters("texSubImage2D", TexSubImage2D, target, level, format, width, height, 0, format, type));
-    ASSERT(validateSize("texSubImage2D", xoffset, yoffset));
-    ASSERT(validateSettableTexFormat("texSubImage2D", format));
-    WebGLTexture* tex = validateTextureBinding("texSubImage2D", target, true);
-    if (!tex) {
-        ASSERT_NOT_REACHED();
-        return;
-    }
-    ASSERT((xoffset + width) >= 0);
-    ASSERT((yoffset + height) >= 0);
-    ASSERT(tex->getWidth(target, level) >= (xoffset + width));
-    ASSERT(tex->getHeight(target, level) >= (yoffset + height));
-    ASSERT(tex->getInternalFormat(target, level) == format);
-    ASSERT(tex->getType(target, level) == type);
-    m_context->texSubImage2D(target, level, xoffset, yoffset, width, height, format, type, pixels);
-}
-
-void WebGLRenderingContext::texSubImage2DImpl(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLenum format, GLenum type, Image* image, WebGLImageConversion::ImageHtmlDomSource domSource, bool flipY, bool premultiplyAlpha, ExceptionState& exceptionState)
-{
-    // All calling functions check isContextLost, so a duplicate check is not needed here.
-    Vector<uint8_t> data;
-    WebGLImageConversion::ImageExtractor imageExtractor(image, domSource, premultiplyAlpha, m_unpackColorspaceConversion == GL_NONE);
-    if (!imageExtractor.extractSucceeded()) {
-        synthesizeGLError(GL_INVALID_VALUE, "texSubImage2D", "bad image");
-        return;
-    }
-    WebGLImageConversion::DataFormat sourceDataFormat = imageExtractor.imageSourceFormat();
-    WebGLImageConversion::AlphaOp alphaOp = imageExtractor.imageAlphaOp();
-    const void* imagePixelData = imageExtractor.imagePixelData();
-
-    bool needConversion = true;
-    if (type == GL_UNSIGNED_BYTE && sourceDataFormat == WebGLImageConversion::DataFormatRGBA8 && format == GL_RGBA && alphaOp == WebGLImageConversion::AlphaDoNothing && !flipY)
-        needConversion = false;
-    else {
-        if (!WebGLImageConversion::packImageData(image, imagePixelData, format, type, flipY, alphaOp, sourceDataFormat, imageExtractor.imageWidth(), imageExtractor.imageHeight(), imageExtractor.imageSourceUnpackAlignment(), data)) {
-            synthesizeGLError(GL_INVALID_VALUE, "texImage2D", "bad image data");
-            return;
-        }
-    }
-
-    if (m_unpackAlignment != 1)
-        m_context->pixelStorei(GL_UNPACK_ALIGNMENT, 1);
-    texSubImage2DBase(target, level, xoffset, yoffset, image->width(), image->height(), format, type,  needConversion ? data.data() : imagePixelData, exceptionState);
-    if (m_unpackAlignment != 1)
-        m_context->pixelStorei(GL_UNPACK_ALIGNMENT, m_unpackAlignment);
-}
-
-void WebGLRenderingContext::texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
-    GLsizei width, GLsizei height,
-    GLenum format, GLenum type, ArrayBufferView* pixels, ExceptionState& exceptionState)
-{
-    if (isContextLost() || !validateTexFuncData("texSubImage2D", level, width, height, format, type, pixels, NullNotAllowed)
-        || !validateTexFunc("texSubImage2D", TexSubImage2D, SourceArrayBufferView, target, level, format, width, height, 0, format, type, xoffset, yoffset))
-        return;
-    void* data = pixels->baseAddress();
-    Vector<uint8_t> tempData;
-    bool changeUnpackAlignment = false;
-    if (data && (m_unpackFlipY || m_unpackPremultiplyAlpha)) {
-        if (!WebGLImageConversion::extractTextureData(width, height, format, type,
-                                           m_unpackAlignment,
-                                           m_unpackFlipY, m_unpackPremultiplyAlpha,
-                                           data,
-                                           tempData))
-            return;
-        data = tempData.data();
-        changeUnpackAlignment = true;
-    }
-    if (changeUnpackAlignment)
-        m_context->pixelStorei(GL_UNPACK_ALIGNMENT, 1);
-    texSubImage2DBase(target, level, xoffset, yoffset, width, height, format, type, data, exceptionState);
-    if (changeUnpackAlignment)
-        m_context->pixelStorei(GL_UNPACK_ALIGNMENT, m_unpackAlignment);
-}
-
-void WebGLRenderingContext::texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
-    GLenum format, GLenum type, ImageData* pixels, ExceptionState& exceptionState)
-{
-    if (isContextLost() || !pixels || !validateTexFunc("texSubImage2D", TexSubImage2D, SourceImageData, target, level, format,  pixels->width(), pixels->height(), 0, format, type, xoffset, yoffset))
-        return;
-
-    Vector<uint8_t> data;
-    bool needConversion = true;
-    // The data from ImageData is always of format RGBA8.
-    // No conversion is needed if destination format is RGBA and type is USIGNED_BYTE and no Flip or Premultiply operation is required.
-    if (format == GL_RGBA && type == GL_UNSIGNED_BYTE && !m_unpackFlipY && !m_unpackPremultiplyAlpha)
-        needConversion = false;
-    else {
-        if (!WebGLImageConversion::extractImageData(pixels->data()->data(), pixels->size(), format, type, m_unpackFlipY, m_unpackPremultiplyAlpha, data)) {
-            synthesizeGLError(GL_INVALID_VALUE, "texSubImage2D", "bad image data");
-            return;
-        }
-    }
-    if (m_unpackAlignment != 1)
-        m_context->pixelStorei(GL_UNPACK_ALIGNMENT, 1);
-    texSubImage2DBase(target, level, xoffset, yoffset, pixels->width(), pixels->height(), format, type, needConversion ? data.data() : pixels->data()->data(), exceptionState);
-    if (m_unpackAlignment != 1)
-        m_context->pixelStorei(GL_UNPACK_ALIGNMENT, m_unpackAlignment);
-}
-
-void WebGLRenderingContext::texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
-    GLenum format, GLenum type, HTMLImageElement* image, ExceptionState& exceptionState)
-{
-    if (isContextLost() || !validateHTMLImageElement("texSubImage2D", image, exceptionState))
-        return;
-
-    RefPtr<Image> imageForRender = image->cachedImage()->imageForRenderer(image->renderer());
-    if (imageForRender->isSVGImage())
-        imageForRender = drawImageIntoBuffer(imageForRender.get(), image->width(), image->height());
-
-    if (!imageForRender || !validateTexFunc("texSubImage2D", TexSubImage2D, SourceHTMLImageElement, target, level, format, imageForRender->width(), imageForRender->height(), 0, format, type, xoffset, yoffset))
-        return;
-
-    texSubImage2DImpl(target, level, xoffset, yoffset, format, type, imageForRender.get(), WebGLImageConversion::HtmlDomImage, m_unpackFlipY, m_unpackPremultiplyAlpha, exceptionState);
-}
-
-void WebGLRenderingContext::texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
-    GLenum format, GLenum type, HTMLCanvasElement* canvas, ExceptionState& exceptionState)
-{
-    if (isContextLost() || !validateHTMLCanvasElement("texSubImage2D", canvas, exceptionState)
-        || !validateTexFunc("texSubImage2D", TexSubImage2D, SourceHTMLCanvasElement, target, level, format, canvas->width(), canvas->height(), 0, format, type, xoffset, yoffset))
-        return;
-
-    RefPtr<ImageData> imageData = canvas->getImageData();
-    if (imageData)
-        texSubImage2D(target, level, xoffset, yoffset, format, type, imageData.get(), exceptionState);
-    else
-        texSubImage2DImpl(target, level, xoffset, yoffset, format, type, canvas->copiedImage(), WebGLImageConversion::HtmlDomCanvas, m_unpackFlipY, m_unpackPremultiplyAlpha, exceptionState);
-}
-
-void WebGLRenderingContext::texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
-    GLenum format, GLenum type, HTMLVideoElement* video, ExceptionState& exceptionState)
-{
-    if (isContextLost() || !validateHTMLVideoElement("texSubImage2D", video, exceptionState)
-        || !validateTexFunc("texSubImage2D", TexSubImage2D, SourceHTMLVideoElement, target, level, format, video->videoWidth(), video->videoHeight(), 0, format, type, xoffset, yoffset))
-        return;
-
-    RefPtr<Image> image = videoFrameToImage(video, ImageBuffer::fastCopyImageMode());
-    if (!image)
-        return;
-    texSubImage2DImpl(target, level, xoffset, yoffset, format, type, image.get(), WebGLImageConversion::HtmlDomVideo, m_unpackFlipY, m_unpackPremultiplyAlpha, exceptionState);
-}
-
-void WebGLRenderingContext::uniform1f(const WebGLUniformLocation* location, GLfloat x)
-{
-    if (isContextLost() || !location)
-        return;
-
-    if (location->program() != m_currentProgram) {
-        synthesizeGLError(GL_INVALID_OPERATION, "uniform1f", "location not for current program");
-        return;
-    }
-
-    m_context->uniform1f(location->location(), x);
-}
-
-void WebGLRenderingContext::uniform1fv(const WebGLUniformLocation* location, Float32Array* v)
-{
-    if (isContextLost() || !validateUniformParameters("uniform1fv", location, v, 1))
-        return;
-
-    m_context->uniform1fv(location->location(), v->length(), v->data());
-}
-
-void WebGLRenderingContext::uniform1fv(const WebGLUniformLocation* location, GLfloat* v, GLsizei size)
-{
-    if (isContextLost() || !validateUniformParameters("uniform1fv", location, v, size, 1))
-        return;
-
-    m_context->uniform1fv(location->location(), size, v);
-}
-
-void WebGLRenderingContext::uniform1i(const WebGLUniformLocation* location, GLint x)
-{
-    if (isContextLost() || !location)
-        return;
-
-    if (location->program() != m_currentProgram) {
-        synthesizeGLError(GL_INVALID_OPERATION, "uniform1i", "location not for current program");
-        return;
-    }
-
-    m_context->uniform1i(location->location(), x);
-}
-
-void WebGLRenderingContext::uniform1iv(const WebGLUniformLocation* location, Int32Array* v)
-{
-    if (isContextLost() || !validateUniformParameters("uniform1iv", location, v, 1))
-        return;
-
-    m_context->uniform1iv(location->location(), v->length(), v->data());
-}
-
-void WebGLRenderingContext::uniform1iv(const WebGLUniformLocation* location, GLint* v, GLsizei size)
-{
-    if (isContextLost() || !validateUniformParameters("uniform1iv", location, v, size, 1))
-        return;
-
-    m_context->uniform1iv(location->location(), size, v);
-}
-
-void WebGLRenderingContext::uniform2f(const WebGLUniformLocation* location, GLfloat x, GLfloat y)
-{
-    if (isContextLost() || !location)
-        return;
-
-    if (location->program() != m_currentProgram) {
-        synthesizeGLError(GL_INVALID_OPERATION, "uniform2f", "location not for current program");
-        return;
-    }
-
-    m_context->uniform2f(location->location(), x, y);
-}
-
-void WebGLRenderingContext::uniform2fv(const WebGLUniformLocation* location, Float32Array* v)
-{
-    if (isContextLost() || !validateUniformParameters("uniform2fv", location, v, 2))
-        return;
-
-    m_context->uniform2fv(location->location(), v->length() / 2, v->data());
-}
-
-void WebGLRenderingContext::uniform2fv(const WebGLUniformLocation* location, GLfloat* v, GLsizei size)
-{
-    if (isContextLost() || !validateUniformParameters("uniform2fv", location, v, size, 2))
-        return;
-
-    m_context->uniform2fv(location->location(), size / 2, v);
-}
-
-void WebGLRenderingContext::uniform2i(const WebGLUniformLocation* location, GLint x, GLint y)
-{
-    if (isContextLost() || !location)
-        return;
-
-    if (location->program() != m_currentProgram) {
-        synthesizeGLError(GL_INVALID_OPERATION, "uniform2i", "location not for current program");
-        return;
-    }
-
-    m_context->uniform2i(location->location(), x, y);
-}
-
-void WebGLRenderingContext::uniform2iv(const WebGLUniformLocation* location, Int32Array* v)
-{
-    if (isContextLost() || !validateUniformParameters("uniform2iv", location, v, 2))
-        return;
-
-    m_context->uniform2iv(location->location(), v->length() / 2, v->data());
-}
-
-void WebGLRenderingContext::uniform2iv(const WebGLUniformLocation* location, GLint* v, GLsizei size)
-{
-    if (isContextLost() || !validateUniformParameters("uniform2iv", location, v, size, 2))
-        return;
-
-    m_context->uniform2iv(location->location(), size / 2, v);
-}
-
-void WebGLRenderingContext::uniform3f(const WebGLUniformLocation* location, GLfloat x, GLfloat y, GLfloat z)
-{
-    if (isContextLost() || !location)
-        return;
-
-    if (location->program() != m_currentProgram) {
-        synthesizeGLError(GL_INVALID_OPERATION, "uniform3f", "location not for current program");
-        return;
-    }
-
-    m_context->uniform3f(location->location(), x, y, z);
-}
-
-void WebGLRenderingContext::uniform3fv(const WebGLUniformLocation* location, Float32Array* v)
-{
-    if (isContextLost() || !validateUniformParameters("uniform3fv", location, v, 3))
-        return;
-
-    m_context->uniform3fv(location->location(), v->length() / 3, v->data());
-}
-
-void WebGLRenderingContext::uniform3fv(const WebGLUniformLocation* location, GLfloat* v, GLsizei size)
-{
-    if (isContextLost() || !validateUniformParameters("uniform3fv", location, v, size, 3))
-        return;
-
-    m_context->uniform3fv(location->location(), size / 3, v);
-}
-
-void WebGLRenderingContext::uniform3i(const WebGLUniformLocation* location, GLint x, GLint y, GLint z)
-{
-    if (isContextLost() || !location)
-        return;
-
-    if (location->program() != m_currentProgram) {
-        synthesizeGLError(GL_INVALID_OPERATION, "uniform3i", "location not for current program");
-        return;
-    }
-
-    m_context->uniform3i(location->location(), x, y, z);
-}
-
-void WebGLRenderingContext::uniform3iv(const WebGLUniformLocation* location, Int32Array* v)
-{
-    if (isContextLost() || !validateUniformParameters("uniform3iv", location, v, 3))
-        return;
-
-    m_context->uniform3iv(location->location(), v->length() / 3, v->data());
-}
-
-void WebGLRenderingContext::uniform3iv(const WebGLUniformLocation* location, GLint* v, GLsizei size)
-{
-    if (isContextLost() || !validateUniformParameters("uniform3iv", location, v, size, 3))
-        return;
-
-    m_context->uniform3iv(location->location(), size / 3, v);
-}
-
-void WebGLRenderingContext::uniform4f(const WebGLUniformLocation* location, GLfloat x, GLfloat y, GLfloat z, GLfloat w)
-{
-    if (isContextLost() || !location)
-        return;
-
-    if (location->program() != m_currentProgram) {
-        synthesizeGLError(GL_INVALID_OPERATION, "uniform4f", "location not for current program");
-        return;
-    }
-
-    m_context->uniform4f(location->location(), x, y, z, w);
-}
-
-void WebGLRenderingContext::uniform4fv(const WebGLUniformLocation* location, Float32Array* v)
-{
-    if (isContextLost() || !validateUniformParameters("uniform4fv", location, v, 4))
-        return;
-
-    m_context->uniform4fv(location->location(), v->length() / 4, v->data());
-}
-
-void WebGLRenderingContext::uniform4fv(const WebGLUniformLocation* location, GLfloat* v, GLsizei size)
-{
-    if (isContextLost() || !validateUniformParameters("uniform4fv", location, v, size, 4))
-        return;
-
-    m_context->uniform4fv(location->location(), size / 4, v);
-}
-
-void WebGLRenderingContext::uniform4i(const WebGLUniformLocation* location, GLint x, GLint y, GLint z, GLint w)
-{
-    if (isContextLost() || !location)
-        return;
-
-    if (location->program() != m_currentProgram) {
-        synthesizeGLError(GL_INVALID_OPERATION, "uniform4i", "location not for current program");
-        return;
-    }
-
-    m_context->uniform4i(location->location(), x, y, z, w);
-}
-
-void WebGLRenderingContext::uniform4iv(const WebGLUniformLocation* location, Int32Array* v)
-{
-    if (isContextLost() || !validateUniformParameters("uniform4iv", location, v, 4))
-        return;
-
-    m_context->uniform4iv(location->location(), v->length() / 4, v->data());
-}
-
-void WebGLRenderingContext::uniform4iv(const WebGLUniformLocation* location, GLint* v, GLsizei size)
-{
-    if (isContextLost() || !validateUniformParameters("uniform4iv", location, v, size, 4))
-        return;
-
-    m_context->uniform4iv(location->location(), size / 4, v);
-}
-
-void WebGLRenderingContext::uniformMatrix2fv(const WebGLUniformLocation* location, GLboolean transpose, Float32Array* v)
-{
-    if (isContextLost() || !validateUniformMatrixParameters("uniformMatrix2fv", location, transpose, v, 4))
-        return;
-    m_context->uniformMatrix2fv(location->location(), v->length() / 4, transpose, v->data());
-}
-
-void WebGLRenderingContext::uniformMatrix2fv(const WebGLUniformLocation* location, GLboolean transpose, GLfloat* v, GLsizei size)
-{
-    if (isContextLost() || !validateUniformMatrixParameters("uniformMatrix2fv", location, transpose, v, size, 4))
-        return;
-    m_context->uniformMatrix2fv(location->location(), size / 4, transpose, v);
-}
-
-void WebGLRenderingContext::uniformMatrix3fv(const WebGLUniformLocation* location, GLboolean transpose, Float32Array* v)
-{
-    if (isContextLost() || !validateUniformMatrixParameters("uniformMatrix3fv", location, transpose, v, 9))
-        return;
-    m_context->uniformMatrix3fv(location->location(), v->length() / 9, transpose, v->data());
-}
-
-void WebGLRenderingContext::uniformMatrix3fv(const WebGLUniformLocation* location, GLboolean transpose, GLfloat* v, GLsizei size)
-{
-    if (isContextLost() || !validateUniformMatrixParameters("uniformMatrix3fv", location, transpose, v, size, 9))
-        return;
-    m_context->uniformMatrix3fv(location->location(), size / 9, transpose, v);
-}
-
-void WebGLRenderingContext::uniformMatrix4fv(const WebGLUniformLocation* location, GLboolean transpose, Float32Array* v)
-{
-    if (isContextLost() || !validateUniformMatrixParameters("uniformMatrix4fv", location, transpose, v, 16))
-        return;
-    m_context->uniformMatrix4fv(location->location(), v->length() / 16, transpose, v->data());
-}
-
-void WebGLRenderingContext::uniformMatrix4fv(const WebGLUniformLocation* location, GLboolean transpose, GLfloat* v, GLsizei size)
-{
-    if (isContextLost() || !validateUniformMatrixParameters("uniformMatrix4fv", location, transpose, v, size, 16))
-        return;
-    m_context->uniformMatrix4fv(location->location(), size / 16, transpose, v);
-}
-
-void WebGLRenderingContext::useProgram(WebGLProgram* program)
-{
-    bool deleted;
-    if (!checkObjectToBeBound("useProgram", program, deleted))
-        return;
-    if (deleted)
-        program = 0;
-    if (program && !program->linkStatus()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "useProgram", "program not valid");
-        return;
-    }
-    if (m_currentProgram != program) {
-        if (m_currentProgram)
-            m_currentProgram->onDetached(m_context.get());
-        m_currentProgram = program;
-        m_context->useProgram(objectOrZero(program));
-        if (program)
-            program->onAttached();
-    }
-}
-
-void WebGLRenderingContext::validateProgram(WebGLProgram* program)
-{
-    if (isContextLost() || !validateWebGLObject("validateProgram", program))
-        return;
-    m_context->validateProgram(objectOrZero(program));
-}
-
-void WebGLRenderingContext::vertexAttrib1f(GLuint index, GLfloat v0)
-{
-    vertexAttribfImpl("vertexAttrib1f", index, 1, v0, 0.0f, 0.0f, 1.0f);
-}
-
-void WebGLRenderingContext::vertexAttrib1fv(GLuint index, Float32Array* v)
-{
-    vertexAttribfvImpl("vertexAttrib1fv", index, v, 1);
-}
-
-void WebGLRenderingContext::vertexAttrib1fv(GLuint index, GLfloat* v, GLsizei size)
-{
-    vertexAttribfvImpl("vertexAttrib1fv", index, v, size, 1);
-}
-
-void WebGLRenderingContext::vertexAttrib2f(GLuint index, GLfloat v0, GLfloat v1)
-{
-    vertexAttribfImpl("vertexAttrib2f", index, 2, v0, v1, 0.0f, 1.0f);
-}
-
-void WebGLRenderingContext::vertexAttrib2fv(GLuint index, Float32Array* v)
-{
-    vertexAttribfvImpl("vertexAttrib2fv", index, v, 2);
-}
-
-void WebGLRenderingContext::vertexAttrib2fv(GLuint index, GLfloat* v, GLsizei size)
-{
-    vertexAttribfvImpl("vertexAttrib2fv", index, v, size, 2);
-}
-
-void WebGLRenderingContext::vertexAttrib3f(GLuint index, GLfloat v0, GLfloat v1, GLfloat v2)
-{
-    vertexAttribfImpl("vertexAttrib3f", index, 3, v0, v1, v2, 1.0f);
-}
-
-void WebGLRenderingContext::vertexAttrib3fv(GLuint index, Float32Array* v)
-{
-    vertexAttribfvImpl("vertexAttrib3fv", index, v, 3);
-}
-
-void WebGLRenderingContext::vertexAttrib3fv(GLuint index, GLfloat* v, GLsizei size)
-{
-    vertexAttribfvImpl("vertexAttrib3fv", index, v, size, 3);
-}
-
-void WebGLRenderingContext::vertexAttrib4f(GLuint index, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3)
-{
-    vertexAttribfImpl("vertexAttrib4f", index, 4, v0, v1, v2, v3);
-}
-
-void WebGLRenderingContext::vertexAttrib4fv(GLuint index, Float32Array* v)
-{
-    vertexAttribfvImpl("vertexAttrib4fv", index, v, 4);
-}
-
-void WebGLRenderingContext::vertexAttrib4fv(GLuint index, GLfloat* v, GLsizei size)
-{
-    vertexAttribfvImpl("vertexAttrib4fv", index, v, size, 4);
-}
-
-void WebGLRenderingContext::vertexAttribPointer(GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, long long offset)
-{
-    if (isContextLost())
-        return;
-    switch (type) {
-    case GL_BYTE:
-    case GL_UNSIGNED_BYTE:
-    case GL_SHORT:
-    case GL_UNSIGNED_SHORT:
-    case GL_FLOAT:
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, "vertexAttribPointer", "invalid type");
-        return;
-    }
-    if (index >= m_maxVertexAttribs) {
-        synthesizeGLError(GL_INVALID_VALUE, "vertexAttribPointer", "index out of range");
-        return;
-    }
-    if (size < 1 || size > 4 || stride < 0 || stride > 255 || offset < 0) {
-        synthesizeGLError(GL_INVALID_VALUE, "vertexAttribPointer", "bad size, stride or offset");
-        return;
-    }
-    if (!m_boundArrayBuffer) {
-        synthesizeGLError(GL_INVALID_OPERATION, "vertexAttribPointer", "no bound ARRAY_BUFFER");
-        return;
-    }
-    // Determine the number of elements the bound buffer can hold, given the offset, size, type and stride
-    unsigned typeSize = sizeInBytes(type);
-    if (!typeSize) {
-        synthesizeGLError(GL_INVALID_ENUM, "vertexAttribPointer", "invalid type");
-        return;
-    }
-    if ((stride % typeSize) || (static_cast<GLintptr>(offset) % typeSize)) {
-        synthesizeGLError(GL_INVALID_OPERATION, "vertexAttribPointer", "stride or offset not valid for type");
-        return;
-    }
-    GLsizei bytesPerElement = size * typeSize;
-
-    m_boundVertexArrayObject->setVertexAttribState(index, bytesPerElement, size, type, normalized, stride, static_cast<GLintptr>(offset), m_boundArrayBuffer);
-    m_context->vertexAttribPointer(index, size, type, normalized, stride, static_cast<GLintptr>(offset));
-}
-
-void WebGLRenderingContext::vertexAttribDivisorANGLE(GLuint index, GLuint divisor)
-{
-    if (isContextLost())
-        return;
-
-    if (index >= m_maxVertexAttribs) {
-        synthesizeGLError(GL_INVALID_VALUE, "vertexAttribDivisorANGLE", "index out of range");
-        return;
-    }
-
-    m_boundVertexArrayObject->setVertexAttribDivisor(index, divisor);
-    m_context->vertexAttribDivisorANGLE(index, divisor);
-}
-
-void WebGLRenderingContext::viewport(GLint x, GLint y, GLsizei width, GLsizei height)
-{
-    if (isContextLost())
-        return;
-    if (!validateSize("viewport", width, height))
-        return;
-    m_context->viewport(x, y, width, height);
-}
-
-void WebGLRenderingContext::forceLostContext(WebGLRenderingContext::LostContextMode mode)
-{
-    if (isContextLost()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "loseContext", "context already lost");
-        return;
-    }
-
-    m_contextGroup->loseContextGroup(mode);
-}
-
-void WebGLRenderingContext::loseContextImpl(WebGLRenderingContext::LostContextMode mode)
-{
-    if (isContextLost())
-        return;
-
-    m_contextLost = true;
-    m_contextLostMode = mode;
-
-    if (mode == RealLostContext) {
-        // Inform the embedder that a lost context was received. In response, the embedder might
-        // decide to take action such as asking the user for permission to use WebGL again.
-        if (Frame* frame = canvas()->document().frame())
-            frame->loader().client()->didLoseWebGLContext(m_context->getGraphicsResetStatusARB());
-    }
-
-    // Make absolutely sure we do not refer to an already-deleted texture or framebuffer.
-    m_drawingBuffer->setTexture2DBinding(0);
-    m_drawingBuffer->setFramebufferBinding(0);
-
-    detachAndRemoveAllObjects();
-
-    // Lose all the extensions.
-    for (size_t i = 0; i < m_extensions.size(); ++i) {
-        ExtensionTracker* tracker = m_extensions[i];
-        tracker->loseExtension();
-    }
-
-    removeAllCompressedTextureFormats();
-
-    if (mode != RealLostContext)
-        destroyContext();
-
-    ConsoleDisplayPreference display = (mode == RealLostContext) ? DisplayInConsole: DontDisplayInConsole;
-    synthesizeGLError(GC3D_CONTEXT_LOST_WEBGL, "loseContext", "context lost", display);
-
-    // Don't allow restoration unless the context lost event has both been
-    // dispatched and its default behavior prevented.
-    m_restoreAllowed = false;
-
-    // Always defer the dispatch of the context lost event, to implement
-    // the spec behavior of queueing a task.
-    m_dispatchContextLostEventTimer.startOneShot(0);
-}
-
-void WebGLRenderingContext::forceRestoreContext()
-{
-    if (!isContextLost()) {
-        synthesizeGLError(GL_INVALID_OPERATION, "restoreContext", "context not lost");
-        return;
-    }
-
-    if (!m_restoreAllowed) {
-        if (m_contextLostMode == SyntheticLostContext)
-            synthesizeGLError(GL_INVALID_OPERATION, "restoreContext", "context restoration not allowed");
-        return;
-    }
-
-    if (!m_restoreTimer.isActive())
-        m_restoreTimer.startOneShot(0);
-}
-
-blink::WebLayer* WebGLRenderingContext::platformLayer() const
-{
-    return m_drawingBuffer->platformLayer();
-}
-
-Extensions3DUtil* WebGLRenderingContext::extensionsUtil()
-{
-    if (!m_extensionsUtil)
-        m_extensionsUtil = adoptPtr(new Extensions3DUtil(m_context.get()));
-    return m_extensionsUtil.get();
-}
-
-void WebGLRenderingContext::removeSharedObject(WebGLSharedObject* object)
-{
-    m_contextGroup->removeObject(object);
-}
-
-void WebGLRenderingContext::addSharedObject(WebGLSharedObject* object)
-{
-    ASSERT(!isContextLost());
-    m_contextGroup->addObject(object);
-}
-
-void WebGLRenderingContext::removeContextObject(WebGLContextObject* object)
-{
-    m_contextObjects.remove(object);
-}
-
-void WebGLRenderingContext::addContextObject(WebGLContextObject* object)
-{
-    ASSERT(!isContextLost());
-    m_contextObjects.add(object);
-}
-
-void WebGLRenderingContext::detachAndRemoveAllObjects()
-{
-    while (m_contextObjects.size() > 0) {
-        HashSet<WebGLContextObject*>::iterator it = m_contextObjects.begin();
-        (*it)->detachContext();
-    }
-}
-
-bool WebGLRenderingContext::hasPendingActivity() const
-{
-    return false;
-}
-
-void WebGLRenderingContext::stop()
-{
-    if (!isContextLost()) {
-        forceLostContext(SyntheticLostContext);
-        destroyContext();
-    }
-}
-
-WebGLGetInfo WebGLRenderingContext::getBooleanParameter(GLenum pname)
-{
-    GLboolean value = 0;
-    if (!isContextLost())
-        m_context->getBooleanv(pname, &value);
-    return WebGLGetInfo(static_cast<bool>(value));
-}
-
-WebGLGetInfo WebGLRenderingContext::getBooleanArrayParameter(GLenum pname)
-{
-    if (pname != GL_COLOR_WRITEMASK) {
-        notImplemented();
-        return WebGLGetInfo(0, 0);
-    }
-    GLboolean value[4] = {0};
-    if (!isContextLost())
-        m_context->getBooleanv(pname, value);
-    bool boolValue[4];
-    for (int ii = 0; ii < 4; ++ii)
-        boolValue[ii] = static_cast<bool>(value[ii]);
-    return WebGLGetInfo(boolValue, 4);
-}
-
-WebGLGetInfo WebGLRenderingContext::getFloatParameter(GLenum pname)
-{
-    GLfloat value = 0;
-    if (!isContextLost())
-        m_context->getFloatv(pname, &value);
-    return WebGLGetInfo(value);
-}
-
-WebGLGetInfo WebGLRenderingContext::getIntParameter(GLenum pname)
-{
-    GLint value = 0;
-    if (!isContextLost())
-        m_context->getIntegerv(pname, &value);
-    return WebGLGetInfo(value);
-}
-
-WebGLGetInfo WebGLRenderingContext::getUnsignedIntParameter(GLenum pname)
-{
-    GLint value = 0;
-    if (!isContextLost())
-        m_context->getIntegerv(pname, &value);
-    return WebGLGetInfo(static_cast<unsigned>(value));
-}
-
-WebGLGetInfo WebGLRenderingContext::getWebGLFloatArrayParameter(GLenum pname)
-{
-    GLfloat value[4] = {0};
-    if (!isContextLost())
-        m_context->getFloatv(pname, value);
-    unsigned length = 0;
-    switch (pname) {
-    case GL_ALIASED_POINT_SIZE_RANGE:
-    case GL_ALIASED_LINE_WIDTH_RANGE:
-    case GL_DEPTH_RANGE:
-        length = 2;
-        break;
-    case GL_BLEND_COLOR:
-    case GL_COLOR_CLEAR_VALUE:
-        length = 4;
-        break;
-    default:
-        notImplemented();
-    }
-    return WebGLGetInfo(Float32Array::create(value, length));
-}
-
-WebGLGetInfo WebGLRenderingContext::getWebGLIntArrayParameter(GLenum pname)
-{
-    GLint value[4] = {0};
-    if (!isContextLost())
-        m_context->getIntegerv(pname, value);
-    unsigned length = 0;
-    switch (pname) {
-    case GL_MAX_VIEWPORT_DIMS:
-        length = 2;
-        break;
-    case GL_SCISSOR_BOX:
-    case GL_VIEWPORT:
-        length = 4;
-        break;
-    default:
-        notImplemented();
-    }
-    return WebGLGetInfo(Int32Array::create(value, length));
-}
-
-void WebGLRenderingContext::handleTextureCompleteness(const char* functionName, bool prepareToDraw)
-{
-    // All calling functions check isContextLost, so a duplicate check is not needed here.
-    bool resetActiveUnit = false;
-    WebGLTexture::TextureExtensionFlag flag = static_cast<WebGLTexture::TextureExtensionFlag>((m_oesTextureFloatLinear ? WebGLTexture::TextureFloatLinearExtensionEnabled : 0)
-        | (m_oesTextureHalfFloatLinear ? WebGLTexture::TextureHalfFloatLinearExtensionEnabled : 0));
-    for (unsigned ii = 0; ii < m_onePlusMaxNonDefaultTextureUnit; ++ii) {
-        if ((m_textureUnits[ii].m_texture2DBinding.get() && m_textureUnits[ii].m_texture2DBinding->needToUseBlackTexture(flag))
-            || (m_textureUnits[ii].m_textureCubeMapBinding.get() && m_textureUnits[ii].m_textureCubeMapBinding->needToUseBlackTexture(flag))) {
-            if (ii != m_activeTextureUnit) {
-                m_context->activeTexture(ii);
-                resetActiveUnit = true;
-            } else if (resetActiveUnit) {
-                m_context->activeTexture(ii);
-                resetActiveUnit = false;
-            }
-            WebGLTexture* tex2D;
-            WebGLTexture* texCubeMap;
-            if (prepareToDraw) {
-                String msg(String("texture bound to texture unit ") + String::number(ii)
-                    + " is not renderable. It maybe non-power-of-2 and have incompatible texture filtering or is not 'texture complete'."
-                    + " Or the texture is Float or Half Float type with linear filtering while OES_float_linear or OES_half_float_linear extension is not enabled.");
-                emitGLWarning(functionName, msg.utf8().data());
-                tex2D = m_blackTexture2D.get();
-                texCubeMap = m_blackTextureCubeMap.get();
-            } else {
-                tex2D = m_textureUnits[ii].m_texture2DBinding.get();
-                texCubeMap = m_textureUnits[ii].m_textureCubeMapBinding.get();
-            }
-            if (m_textureUnits[ii].m_texture2DBinding && m_textureUnits[ii].m_texture2DBinding->needToUseBlackTexture(flag))
-                m_context->bindTexture(GL_TEXTURE_2D, objectOrZero(tex2D));
-            if (m_textureUnits[ii].m_textureCubeMapBinding && m_textureUnits[ii].m_textureCubeMapBinding->needToUseBlackTexture(flag))
-                m_context->bindTexture(GL_TEXTURE_CUBE_MAP, objectOrZero(texCubeMap));
-        }
-    }
-    if (resetActiveUnit)
-        m_context->activeTexture(m_activeTextureUnit);
-}
-
-void WebGLRenderingContext::createFallbackBlackTextures1x1()
-{
-    // All calling functions check isContextLost, so a duplicate check is not needed here.
-    unsigned char black[] = {0, 0, 0, 255};
-    m_blackTexture2D = createTexture();
-    m_context->bindTexture(GL_TEXTURE_2D, m_blackTexture2D->object());
-    m_context->texImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 1, 1,
-        0, GL_RGBA, GL_UNSIGNED_BYTE, black);
-    m_context->bindTexture(GL_TEXTURE_2D, 0);
-    m_blackTextureCubeMap = createTexture();
-    m_context->bindTexture(GL_TEXTURE_CUBE_MAP, m_blackTextureCubeMap->object());
-    m_context->texImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGBA, 1, 1,
-        0, GL_RGBA, GL_UNSIGNED_BYTE, black);
-    m_context->texImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, GL_RGBA, 1, 1,
-        0, GL_RGBA, GL_UNSIGNED_BYTE, black);
-    m_context->texImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, GL_RGBA, 1, 1,
-        0, GL_RGBA, GL_UNSIGNED_BYTE, black);
-    m_context->texImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, GL_RGBA, 1, 1,
-        0, GL_RGBA, GL_UNSIGNED_BYTE, black);
-    m_context->texImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, GL_RGBA, 1, 1,
-        0, GL_RGBA, GL_UNSIGNED_BYTE, black);
-    m_context->texImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, GL_RGBA, 1, 1,
-        0, GL_RGBA, GL_UNSIGNED_BYTE, black);
-    m_context->bindTexture(GL_TEXTURE_CUBE_MAP, 0);
-}
-
-bool WebGLRenderingContext::isTexInternalFormatColorBufferCombinationValid(GLenum texInternalFormat, GLenum colorBufferFormat)
-{
-    unsigned need = WebGLImageConversion::getChannelBitsByFormat(texInternalFormat);
-    unsigned have = WebGLImageConversion::getChannelBitsByFormat(colorBufferFormat);
-    return (need & have) == need;
-}
-
-GLenum WebGLRenderingContext::boundFramebufferColorFormat()
-{
-    if (m_framebufferBinding && m_framebufferBinding->object())
-        return m_framebufferBinding->colorBufferFormat();
-    if (m_requestedAttributes->alpha())
-        return GL_RGBA;
-    return GL_RGB;
-}
-
-int WebGLRenderingContext::boundFramebufferWidth()
-{
-    if (m_framebufferBinding && m_framebufferBinding->object())
-        return m_framebufferBinding->colorBufferWidth();
-    return m_drawingBuffer->size().width();
-}
-
-int WebGLRenderingContext::boundFramebufferHeight()
-{
-    if (m_framebufferBinding && m_framebufferBinding->object())
-        return m_framebufferBinding->colorBufferHeight();
-    return m_drawingBuffer->size().height();
-}
-
-WebGLTexture* WebGLRenderingContext::validateTextureBinding(const char* functionName, GLenum target, bool useSixEnumsForCubeMap)
-{
-    WebGLTexture* tex = 0;
-    switch (target) {
-    case GL_TEXTURE_2D:
-        tex = m_textureUnits[m_activeTextureUnit].m_texture2DBinding.get();
-        break;
-    case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
-    case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
-    case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
-    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
-    case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
-    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
-        if (!useSixEnumsForCubeMap) {
-            synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid texture target");
-            return 0;
-        }
-        tex = m_textureUnits[m_activeTextureUnit].m_textureCubeMapBinding.get();
-        break;
-    case GL_TEXTURE_CUBE_MAP:
-        if (useSixEnumsForCubeMap) {
-            synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid texture target");
-            return 0;
-        }
-        tex = m_textureUnits[m_activeTextureUnit].m_textureCubeMapBinding.get();
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid texture target");
-        return 0;
-    }
-    if (!tex)
-        synthesizeGLError(GL_INVALID_OPERATION, functionName, "no texture");
-    return tex;
-}
-
-bool WebGLRenderingContext::validateLocationLength(const char* functionName, const String& string)
-{
-    const unsigned maxWebGLLocationLength = 256;
-    if (string.length() > maxWebGLLocationLength) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "location length > 256");
-        return false;
-    }
-    return true;
-}
-
-bool WebGLRenderingContext::validateSize(const char* functionName, GLint x, GLint y)
-{
-    if (x < 0 || y < 0) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "size < 0");
-        return false;
-    }
-    return true;
-}
-
-bool WebGLRenderingContext::validateString(const char* functionName, const String& string)
-{
-    for (size_t i = 0; i < string.length(); ++i) {
-        if (!validateCharacter(string[i])) {
-            synthesizeGLError(GL_INVALID_VALUE, functionName, "string not ASCII");
-            return false;
-        }
-    }
-    return true;
-}
-
-bool WebGLRenderingContext::validateTexFuncFormatAndType(const char* functionName, GLenum format, GLenum type, GLint level)
-{
-    switch (format) {
-    case GL_ALPHA:
-    case GL_LUMINANCE:
-    case GL_LUMINANCE_ALPHA:
-    case GL_RGB:
-    case GL_RGBA:
-        break;
-    case GL_DEPTH_STENCIL_OES:
-    case GL_DEPTH_COMPONENT:
-        if (m_webglDepthTexture)
-            break;
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "depth texture formats not enabled");
-        return false;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid texture format");
-        return false;
-    }
-
-    switch (type) {
-    case GL_UNSIGNED_BYTE:
-    case GL_UNSIGNED_SHORT_5_6_5:
-    case GL_UNSIGNED_SHORT_4_4_4_4:
-    case GL_UNSIGNED_SHORT_5_5_5_1:
-        break;
-    case GL_FLOAT:
-        if (m_oesTextureFloat)
-            break;
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid texture type");
-        return false;
-    case GL_HALF_FLOAT_OES:
-        if (m_oesTextureHalfFloat)
-            break;
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid texture type");
-        return false;
-    case GL_UNSIGNED_INT:
-    case GL_UNSIGNED_INT_24_8_OES:
-    case GL_UNSIGNED_SHORT:
-        if (m_webglDepthTexture)
-            break;
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid texture type");
-        return false;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid texture type");
-        return false;
-    }
-
-    // Verify that the combination of format and type is supported.
-    switch (format) {
-    case GL_ALPHA:
-    case GL_LUMINANCE:
-    case GL_LUMINANCE_ALPHA:
-        if (type != GL_UNSIGNED_BYTE
-            && type != GL_FLOAT
-            && type != GL_HALF_FLOAT_OES) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "invalid type for format");
-            return false;
-        }
-        break;
-    case GL_RGB:
-        if (type != GL_UNSIGNED_BYTE
-            && type != GL_UNSIGNED_SHORT_5_6_5
-            && type != GL_FLOAT
-            && type != GL_HALF_FLOAT_OES) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "invalid type for RGB format");
-            return false;
-        }
-        break;
-    case GL_RGBA:
-        if (type != GL_UNSIGNED_BYTE
-            && type != GL_UNSIGNED_SHORT_4_4_4_4
-            && type != GL_UNSIGNED_SHORT_5_5_5_1
-            && type != GL_FLOAT
-            && type != GL_HALF_FLOAT_OES) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "invalid type for RGBA format");
-            return false;
-        }
-        break;
-    case GL_DEPTH_COMPONENT:
-        if (!m_webglDepthTexture) {
-            synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid format. DEPTH_COMPONENT not enabled");
-            return false;
-        }
-        if (type != GL_UNSIGNED_SHORT
-            && type != GL_UNSIGNED_INT) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "invalid type for DEPTH_COMPONENT format");
-            return false;
-        }
-        if (level > 0) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "level must be 0 for DEPTH_COMPONENT format");
-            return false;
-        }
-        break;
-    case GL_DEPTH_STENCIL_OES:
-        if (!m_webglDepthTexture) {
-            synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid format. DEPTH_STENCIL not enabled");
-            return false;
-        }
-        if (type != GL_UNSIGNED_INT_24_8_OES) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "invalid type for DEPTH_STENCIL format");
-            return false;
-        }
-        if (level > 0) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "level must be 0 for DEPTH_STENCIL format");
-            return false;
-        }
-        break;
-    default:
-        ASSERT_NOT_REACHED();
-    }
-
-    return true;
-}
-
-bool WebGLRenderingContext::validateTexFuncLevel(const char* functionName, GLenum target, GLint level)
-{
-    if (level < 0) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "level < 0");
-        return false;
-    }
-    switch (target) {
-    case GL_TEXTURE_2D:
-        if (level >= m_maxTextureLevel) {
-            synthesizeGLError(GL_INVALID_VALUE, functionName, "level out of range");
-            return false;
-        }
-        break;
-    case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
-    case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
-    case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
-    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
-    case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
-    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
-        if (level >= m_maxCubeMapTextureLevel) {
-            synthesizeGLError(GL_INVALID_VALUE, functionName, "level out of range");
-            return false;
-        }
-        break;
-    }
-    // This function only checks if level is legal, so we return true and don't
-    // generate INVALID_ENUM if target is illegal.
-    return true;
-}
-
-bool WebGLRenderingContext::validateTexFuncDimensions(const char* functionName, TexFuncValidationFunctionType functionType,
-    GLenum target, GLint level, GLsizei width, GLsizei height)
-{
-    if (width < 0 || height < 0) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "width or height < 0");
-        return false;
-    }
-
-    switch (target) {
-    case GL_TEXTURE_2D:
-        if (width > (m_maxTextureSize >> level) || height > (m_maxTextureSize >> level)) {
-            synthesizeGLError(GL_INVALID_VALUE, functionName, "width or height out of range");
-            return false;
-        }
-        break;
-    case GL_TEXTURE_CUBE_MAP_POSITIVE_X:
-    case GL_TEXTURE_CUBE_MAP_NEGATIVE_X:
-    case GL_TEXTURE_CUBE_MAP_POSITIVE_Y:
-    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y:
-    case GL_TEXTURE_CUBE_MAP_POSITIVE_Z:
-    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z:
-        if (functionType != TexSubImage2D && width != height) {
-            synthesizeGLError(GL_INVALID_VALUE, functionName, "width != height for cube map");
-            return false;
-        }
-        // No need to check height here. For texImage width == height.
-        // For texSubImage that will be checked when checking yoffset + height is in range.
-        if (width > (m_maxCubeMapTextureSize >> level)) {
-            synthesizeGLError(GL_INVALID_VALUE, functionName, "width or height out of range for cube map");
-            return false;
-        }
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid target");
-        return false;
-    }
-    return true;
-}
-
-bool WebGLRenderingContext::validateTexFuncParameters(const char* functionName, TexFuncValidationFunctionType functionType, GLenum target,
-    GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type)
-{
-    // We absolutely have to validate the format and type combination.
-    // The texImage2D entry points taking HTMLImage, etc. will produce
-    // temporary data based on this combination, so it must be legal.
-    if (!validateTexFuncFormatAndType(functionName, format, type, level) || !validateTexFuncLevel(functionName, target, level))
-        return false;
-
-    if (!validateTexFuncDimensions(functionName, functionType, target, level, width, height))
-        return false;
-
-    if (format != internalformat) {
-        synthesizeGLError(GL_INVALID_OPERATION, functionName, "format != internalformat");
-        return false;
-    }
-
-    if (border) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "border != 0");
-        return false;
-    }
-
-    return true;
-}
-
-bool WebGLRenderingContext::validateTexFuncData(const char* functionName, GLint level, GLsizei width, GLsizei height, GLenum format, GLenum type, ArrayBufferView* pixels, NullDisposition disposition)
-{
-    // All calling functions check isContextLost, so a duplicate check is not needed here.
-    if (!pixels) {
-        if (disposition == NullAllowed)
-            return true;
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "no pixels");
-        return false;
-    }
-
-    if (!validateTexFuncFormatAndType(functionName, format, type, level))
-        return false;
-    if (!validateSettableTexFormat(functionName, format))
-        return false;
-
-    switch (type) {
-    case GL_UNSIGNED_BYTE:
-        if (pixels->type() != ArrayBufferView::TypeUint8) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "type UNSIGNED_BYTE but ArrayBufferView not Uint8Array");
-            return false;
-        }
-        break;
-    case GL_UNSIGNED_SHORT_5_6_5:
-    case GL_UNSIGNED_SHORT_4_4_4_4:
-    case GL_UNSIGNED_SHORT_5_5_5_1:
-        if (pixels->type() != ArrayBufferView::TypeUint16) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "type UNSIGNED_SHORT but ArrayBufferView not Uint16Array");
-            return false;
-        }
-        break;
-    case GL_FLOAT: // OES_texture_float
-        if (pixels->type() != ArrayBufferView::TypeFloat32) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "type FLOAT but ArrayBufferView not Float32Array");
-            return false;
-        }
-        break;
-    case GL_HALF_FLOAT_OES: // OES_texture_half_float
-        // As per the specification, ArrayBufferView should be null when
-        // OES_texture_half_float is enabled.
-        if (pixels) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "type HALF_FLOAT_OES but ArrayBufferView is not NULL");
-            return false;
-        }
-        break;
-    default:
-        ASSERT_NOT_REACHED();
-    }
-
-    unsigned totalBytesRequired;
-    GLenum error = WebGLImageConversion::computeImageSizeInBytes(format, type, width, height, m_unpackAlignment, &totalBytesRequired, 0);
-    if (error != GL_NO_ERROR) {
-        synthesizeGLError(error, functionName, "invalid texture dimensions");
-        return false;
-    }
-    if (pixels->byteLength() < totalBytesRequired) {
-        if (m_unpackAlignment != 1) {
-            error = WebGLImageConversion::computeImageSizeInBytes(format, type, width, height, 1, &totalBytesRequired, 0);
-            if (pixels->byteLength() == totalBytesRequired) {
-                synthesizeGLError(GL_INVALID_OPERATION, functionName, "ArrayBufferView not big enough for request with UNPACK_ALIGNMENT > 1");
-                return false;
-            }
-        }
-        synthesizeGLError(GL_INVALID_OPERATION, functionName, "ArrayBufferView not big enough for request");
-        return false;
-    }
-    return true;
-}
-
-bool WebGLRenderingContext::validateCompressedTexFormat(GLenum format)
-{
-    return m_compressedTextureFormats.contains(format);
-}
-
-bool WebGLRenderingContext::validateCompressedTexFuncData(const char* functionName, GLsizei width, GLsizei height, GLenum format, ArrayBufferView* pixels)
-{
-    if (!pixels) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "no pixels");
-        return false;
-    }
-    if (width < 0 || height < 0) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "width or height < 0");
-        return false;
-    }
-
-    unsigned bytesRequired = 0;
-
-    switch (format) {
-    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
-    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
-        {
-            const int kBlockWidth = 4;
-            const int kBlockHeight = 4;
-            const int kBlockSize = 8;
-            int numBlocksAcross = (width + kBlockWidth - 1) / kBlockWidth;
-            int numBlocksDown = (height + kBlockHeight - 1) / kBlockHeight;
-            int numBlocks = numBlocksAcross * numBlocksDown;
-            bytesRequired = numBlocks * kBlockSize;
-        }
-        break;
-    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
-    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
-        {
-            const int kBlockWidth = 4;
-            const int kBlockHeight = 4;
-            const int kBlockSize = 16;
-            int numBlocksAcross = (width + kBlockWidth - 1) / kBlockWidth;
-            int numBlocksDown = (height + kBlockHeight - 1) / kBlockHeight;
-            int numBlocks = numBlocksAcross * numBlocksDown;
-            bytesRequired = numBlocks * kBlockSize;
-        }
-        break;
-    case GC3D_COMPRESSED_ATC_RGB_AMD:
-        {
-            bytesRequired = floor(static_cast<double>((width + 3) / 4)) * floor(static_cast<double>((height + 3) / 4)) * 8;
-        }
-        break;
-    case GC3D_COMPRESSED_ATC_RGBA_EXPLICIT_ALPHA_AMD:
-    case GC3D_COMPRESSED_ATC_RGBA_INTERPOLATED_ALPHA_AMD:
-        {
-            bytesRequired = floor(static_cast<double>((width + 3) / 4)) * floor(static_cast<double>((height + 3) / 4)) * 16;
-        }
-        break;
-    case GL_COMPRESSED_RGB_PVRTC_4BPPV1_IMG:
-    case GL_COMPRESSED_RGBA_PVRTC_4BPPV1_IMG:
-        {
-            bytesRequired = max(width, 8) * max(height, 8) / 2;
-        }
-        break;
-    case GL_COMPRESSED_RGB_PVRTC_2BPPV1_IMG:
-    case GL_COMPRESSED_RGBA_PVRTC_2BPPV1_IMG:
-        {
-            bytesRequired = max(width, 8) * max(height, 8) / 4;
-        }
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid format");
-        return false;
-    }
-
-    if (pixels->byteLength() != bytesRequired) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "length of ArrayBufferView is not correct for dimensions");
-        return false;
-    }
-
-    return true;
-}
-
-bool WebGLRenderingContext::validateCompressedTexDimensions(const char* functionName, TexFuncValidationFunctionType functionType, GLenum target, GLint level, GLsizei width, GLsizei height, GLenum format)
-{
-    if (!validateTexFuncDimensions(functionName, functionType, target, level, width, height))
-        return false;
-
-    switch (format) {
-    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
-    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
-    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
-    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT: {
-        const int kBlockWidth = 4;
-        const int kBlockHeight = 4;
-        bool widthValid = (level && width == 1) || (level && width == 2) || !(width % kBlockWidth);
-        bool heightValid = (level && height == 1) || (level && height == 2) || !(height % kBlockHeight);
-        if (!widthValid || !heightValid) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "width or height invalid for level");
-            return false;
-        }
-        return true;
-    }
-    default:
-        return false;
-    }
-}
-
-bool WebGLRenderingContext::validateCompressedTexSubDimensions(const char* functionName, GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, WebGLTexture* tex)
-{
-    if (xoffset < 0 || yoffset < 0) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "xoffset or yoffset < 0");
-        return false;
-    }
-
-    switch (format) {
-    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
-    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
-    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
-    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT: {
-        const int kBlockWidth = 4;
-        const int kBlockHeight = 4;
-        if ((xoffset % kBlockWidth) || (yoffset % kBlockHeight)) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "xoffset or yoffset not multiple of 4");
-            return false;
-        }
-        if (width - xoffset > tex->getWidth(target, level)
-            || height - yoffset > tex->getHeight(target, level)) {
-            synthesizeGLError(GL_INVALID_OPERATION, functionName, "dimensions out of range");
-            return false;
-        }
-        return validateCompressedTexDimensions(functionName, TexSubImage2D, target, level, width, height, format);
-    }
-    default:
-        return false;
-    }
-}
-
-bool WebGLRenderingContext::validateDrawMode(const char* functionName, GLenum mode)
-{
-    switch (mode) {
-    case GL_POINTS:
-    case GL_LINE_STRIP:
-    case GL_LINE_LOOP:
-    case GL_LINES:
-    case GL_TRIANGLE_STRIP:
-    case GL_TRIANGLE_FAN:
-    case GL_TRIANGLES:
-        return true;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid draw mode");
-        return false;
-    }
-}
-
-bool WebGLRenderingContext::validateStencilSettings(const char* functionName)
-{
-    if (m_stencilMask != m_stencilMaskBack || m_stencilFuncRef != m_stencilFuncRefBack || m_stencilFuncMask != m_stencilFuncMaskBack) {
-        synthesizeGLError(GL_INVALID_OPERATION, functionName, "front and back stencils settings do not match");
-        return false;
-    }
-    return true;
-}
-
-bool WebGLRenderingContext::validateStencilOrDepthFunc(const char* functionName, GLenum func)
-{
-    switch (func) {
-    case GL_NEVER:
-    case GL_LESS:
-    case GL_LEQUAL:
-    case GL_GREATER:
-    case GL_GEQUAL:
-    case GL_EQUAL:
-    case GL_NOTEQUAL:
-    case GL_ALWAYS:
-        return true;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid function");
-        return false;
-    }
-}
-
-void WebGLRenderingContext::printGLErrorToConsole(const String& message)
-{
-    if (!m_numGLErrorsToConsoleAllowed)
-        return;
-
-    --m_numGLErrorsToConsoleAllowed;
-    printWarningToConsole(message);
-
-    if (!m_numGLErrorsToConsoleAllowed)
-        printWarningToConsole("WebGL: too many errors, no more errors will be reported to the console for this context.");
-
-    return;
-}
-
-void WebGLRenderingContext::printWarningToConsole(const String& message)
-{
-    if (!canvas())
-        return;
-    canvas()->document().addConsoleMessage(RenderingMessageSource, WarningMessageLevel, message);
-}
-
-bool WebGLRenderingContext::validateFramebufferFuncParameters(const char* functionName, GLenum target, GLenum attachment)
-{
-    if (target != GL_FRAMEBUFFER) {
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid target");
-        return false;
-    }
-    switch (attachment) {
-    case GL_COLOR_ATTACHMENT0:
-    case GL_DEPTH_ATTACHMENT:
-    case GL_STENCIL_ATTACHMENT:
-    case GC3D_DEPTH_STENCIL_ATTACHMENT_WEBGL:
-        break;
-    default:
-        if (m_webglDrawBuffers
-            && attachment > GL_COLOR_ATTACHMENT0
-            && attachment < static_cast<GLenum>(GL_COLOR_ATTACHMENT0 + maxColorAttachments()))
-            break;
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid attachment");
-        return false;
-    }
-    return true;
-}
-
-bool WebGLRenderingContext::validateBlendEquation(const char* functionName, GLenum mode)
-{
-    switch (mode) {
-    case GL_FUNC_ADD:
-    case GL_FUNC_SUBTRACT:
-    case GL_FUNC_REVERSE_SUBTRACT:
-        return true;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid mode");
-        return false;
-    }
-}
-
-bool WebGLRenderingContext::validateBlendFuncFactors(const char* functionName, GLenum src, GLenum dst)
-{
-    if (((src == GL_CONSTANT_COLOR || src == GL_ONE_MINUS_CONSTANT_COLOR)
-        && (dst == GL_CONSTANT_ALPHA || dst == GL_ONE_MINUS_CONSTANT_ALPHA))
-        || ((dst == GL_CONSTANT_COLOR || dst == GL_ONE_MINUS_CONSTANT_COLOR)
-        && (src == GL_CONSTANT_ALPHA || src == GL_ONE_MINUS_CONSTANT_ALPHA))) {
-        synthesizeGLError(GL_INVALID_OPERATION, functionName, "incompatible src and dst");
-        return false;
-    }
-    return true;
-}
-
-bool WebGLRenderingContext::validateCapability(const char* functionName, GLenum cap)
-{
-    switch (cap) {
-    case GL_BLEND:
-    case GL_CULL_FACE:
-    case GL_DEPTH_TEST:
-    case GL_DITHER:
-    case GL_POLYGON_OFFSET_FILL:
-    case GL_SAMPLE_ALPHA_TO_COVERAGE:
-    case GL_SAMPLE_COVERAGE:
-    case GL_SCISSOR_TEST:
-    case GL_STENCIL_TEST:
-        return true;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid capability");
-        return false;
-    }
-}
-
-bool WebGLRenderingContext::validateUniformParameters(const char* functionName, const WebGLUniformLocation* location, Float32Array* v, GLsizei requiredMinSize)
-{
-    if (!v) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "no array");
-        return false;
-    }
-    return validateUniformMatrixParameters(functionName, location, false, v->data(), v->length(), requiredMinSize);
-}
-
-bool WebGLRenderingContext::validateUniformParameters(const char* functionName, const WebGLUniformLocation* location, Int32Array* v, GLsizei requiredMinSize)
-{
-    if (!v) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "no array");
-        return false;
-    }
-    return validateUniformMatrixParameters(functionName, location, false, v->data(), v->length(), requiredMinSize);
-}
-
-bool WebGLRenderingContext::validateUniformParameters(const char* functionName, const WebGLUniformLocation* location, void* v, GLsizei size, GLsizei requiredMinSize)
-{
-    return validateUniformMatrixParameters(functionName, location, false, v, size, requiredMinSize);
-}
-
-bool WebGLRenderingContext::validateUniformMatrixParameters(const char* functionName, const WebGLUniformLocation* location, GLboolean transpose, Float32Array* v, GLsizei requiredMinSize)
-{
-    if (!v) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "no array");
-        return false;
-    }
-    return validateUniformMatrixParameters(functionName, location, transpose, v->data(), v->length(), requiredMinSize);
-}
-
-bool WebGLRenderingContext::validateUniformMatrixParameters(const char* functionName, const WebGLUniformLocation* location, GLboolean transpose, void* v, GLsizei size, GLsizei requiredMinSize)
-{
-    if (!location)
-        return false;
-    if (location->program() != m_currentProgram) {
-        synthesizeGLError(GL_INVALID_OPERATION, functionName, "location is not from current program");
-        return false;
-    }
-    if (!v) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "no array");
-        return false;
-    }
-    if (transpose) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "transpose not FALSE");
-        return false;
-    }
-    if (size < requiredMinSize || (size % requiredMinSize)) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "invalid size");
-        return false;
-    }
-    return true;
-}
-
-WebGLBuffer* WebGLRenderingContext::validateBufferDataParameters(const char* functionName, GLenum target, GLenum usage)
-{
-    WebGLBuffer* buffer = 0;
-    switch (target) {
-    case GL_ELEMENT_ARRAY_BUFFER:
-        buffer = m_boundVertexArrayObject->boundElementArrayBuffer().get();
-        break;
-    case GL_ARRAY_BUFFER:
-        buffer = m_boundArrayBuffer.get();
-        break;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid target");
-        return 0;
-    }
-    if (!buffer) {
-        synthesizeGLError(GL_INVALID_OPERATION, functionName, "no buffer");
-        return 0;
-    }
-    switch (usage) {
-    case GL_STREAM_DRAW:
-    case GL_STATIC_DRAW:
-    case GL_DYNAMIC_DRAW:
-        return buffer;
-    }
-    synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid usage");
-    return 0;
-}
-
-bool WebGLRenderingContext::validateHTMLImageElement(const char* functionName, HTMLImageElement* image, ExceptionState& exceptionState)
-{
-    if (!image || !image->cachedImage()) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "no image");
-        return false;
-    }
-    const KURL& url = image->cachedImage()->response().url();
-    if (url.isNull() || url.isEmpty() || !url.isValid()) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "invalid image");
-        return false;
-    }
-    if (wouldTaintOrigin(image)) {
-        exceptionState.throwSecurityError("The cross-origin image at " + url.elidedString() + " may not be loaded.");
-        return false;
-    }
-    return true;
-}
-
-bool WebGLRenderingContext::validateHTMLCanvasElement(const char* functionName, HTMLCanvasElement* canvas, ExceptionState& exceptionState)
-{
-    if (!canvas || !canvas->buffer()) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "no canvas");
-        return false;
-    }
-    if (wouldTaintOrigin(canvas)) {
-        exceptionState.throwSecurityError("Tainted canvases may not be loaded.");
-        return false;
-    }
-    return true;
-}
-
-bool WebGLRenderingContext::validateHTMLVideoElement(const char* functionName, HTMLVideoElement* video, ExceptionState& exceptionState)
-{
-    if (!video || !video->videoWidth() || !video->videoHeight()) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "no video");
-        return false;
-    }
-    if (wouldTaintOrigin(video)) {
-        exceptionState.throwSecurityError("The video element contains cross-origin data, and may not be loaded.");
-        return false;
-    }
-    return true;
-}
-
-bool WebGLRenderingContext::validateDrawArrays(const char* functionName, GLenum mode, GLint first, GLsizei count)
-{
-    if (isContextLost() || !validateDrawMode(functionName, mode))
-        return false;
-
-    if (!validateStencilSettings(functionName))
-        return false;
-
-    if (first < 0 || count < 0) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "first or count < 0");
-        return false;
-    }
-
-    if (!count) {
-        markContextChanged();
-        return false;
-    }
-
-    if (!validateRenderingState(functionName)) {
-        return false;
-    }
-
-    const char* reason = "framebuffer incomplete";
-    if (m_framebufferBinding && !m_framebufferBinding->onAccess(m_context.get(), &reason)) {
-        synthesizeGLError(GL_INVALID_FRAMEBUFFER_OPERATION, functionName, reason);
-        return false;
-    }
-
-    return true;
-}
-
-bool WebGLRenderingContext::validateDrawElements(const char* functionName, GLenum mode, GLsizei count, GLenum type, long long offset)
-{
-    if (isContextLost() || !validateDrawMode(functionName, mode))
-        return false;
-
-    if (!validateStencilSettings(functionName))
-        return false;
-
-    switch (type) {
-    case GL_UNSIGNED_BYTE:
-    case GL_UNSIGNED_SHORT:
-        break;
-    case GL_UNSIGNED_INT:
-        if (m_oesElementIndexUint)
-            break;
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid type");
-        return false;
-    default:
-        synthesizeGLError(GL_INVALID_ENUM, functionName, "invalid type");
-        return false;
-    }
-
-    if (count < 0 || offset < 0) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "count or offset < 0");
-        return false;
-    }
-
-    if (!count) {
-        markContextChanged();
-        return false;
-    }
-
-    if (!m_boundVertexArrayObject->boundElementArrayBuffer()) {
-        synthesizeGLError(GL_INVALID_OPERATION, functionName, "no ELEMENT_ARRAY_BUFFER bound");
-        return false;
-    }
-
-    if (!validateRenderingState(functionName)) {
-        return false;
-    }
-
-    const char* reason = "framebuffer incomplete";
-    if (m_framebufferBinding && !m_framebufferBinding->onAccess(m_context.get(), &reason)) {
-        synthesizeGLError(GL_INVALID_FRAMEBUFFER_OPERATION, functionName, reason);
-        return false;
-    }
-
-    return true;
-}
-
-// Helper function to validate draw*Instanced calls
-bool WebGLRenderingContext::validateDrawInstanced(const char* functionName, GLsizei primcount)
-{
-    if (primcount < 0) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "primcount < 0");
-        return false;
-    }
-
-    // Ensure at least one enabled vertex attrib has a divisor of 0.
-    for (unsigned i = 0; i < m_onePlusMaxEnabledAttribIndex; ++i) {
-        const WebGLVertexArrayObjectOES::VertexAttribState& state = m_boundVertexArrayObject->getVertexAttribState(i);
-        if (state.enabled && !state.divisor)
-            return true;
-    }
-
-    synthesizeGLError(GL_INVALID_OPERATION, functionName, "at least one enabled attribute must have a divisor of 0");
-    return false;
-}
-
-void WebGLRenderingContext::vertexAttribfImpl(const char* functionName, GLuint index, GLsizei expectedSize, GLfloat v0, GLfloat v1, GLfloat v2, GLfloat v3)
-{
-    if (isContextLost())
-        return;
-    if (index >= m_maxVertexAttribs) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "index out of range");
-        return;
-    }
-    // In GL, we skip setting vertexAttrib0 values.
-    switch (expectedSize) {
-    case 1:
-        m_context->vertexAttrib1f(index, v0);
-        break;
-    case 2:
-        m_context->vertexAttrib2f(index, v0, v1);
-        break;
-    case 3:
-        m_context->vertexAttrib3f(index, v0, v1, v2);
-        break;
-    case 4:
-        m_context->vertexAttrib4f(index, v0, v1, v2, v3);
-        break;
-    }
-    VertexAttribValue& attribValue = m_vertexAttribValue[index];
-    attribValue.value[0] = v0;
-    attribValue.value[1] = v1;
-    attribValue.value[2] = v2;
-    attribValue.value[3] = v3;
-}
-
-void WebGLRenderingContext::vertexAttribfvImpl(const char* functionName, GLuint index, Float32Array* v, GLsizei expectedSize)
-{
-    if (isContextLost())
-        return;
-    if (!v) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "no array");
-        return;
-    }
-    vertexAttribfvImpl(functionName, index, v->data(), v->length(), expectedSize);
-}
-
-void WebGLRenderingContext::vertexAttribfvImpl(const char* functionName, GLuint index, GLfloat* v, GLsizei size, GLsizei expectedSize)
-{
-    if (isContextLost())
-        return;
-    if (!v) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "no array");
-        return;
-    }
-    if (size < expectedSize) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "invalid size");
-        return;
-    }
-    if (index >= m_maxVertexAttribs) {
-        synthesizeGLError(GL_INVALID_VALUE, functionName, "index out of range");
-        return;
-    }
-    // In GL, we skip setting vertexAttrib0 values.
-    switch (expectedSize) {
-    case 1:
-        m_context->vertexAttrib1fv(index, v);
-        break;
-    case 2:
-        m_context->vertexAttrib2fv(index, v);
-        break;
-    case 3:
-        m_context->vertexAttrib3fv(index, v);
-        break;
-    case 4:
-        m_context->vertexAttrib4fv(index, v);
-        break;
-    }
-    VertexAttribValue& attribValue = m_vertexAttribValue[index];
-    attribValue.initValue();
-    for (int ii = 0; ii < expectedSize; ++ii)
-        attribValue.value[ii] = v[ii];
-}
-
-void WebGLRenderingContext::dispatchContextLostEvent(Timer<WebGLRenderingContext>*)
-{
-    RefPtr<WebGLContextEvent> event = WebGLContextEvent::create(EventTypeNames::webglcontextlost, false, true, "");
-    canvas()->dispatchEvent(event);
-    m_restoreAllowed = event->defaultPrevented();
-    deactivateContext(this, m_contextLostMode != RealLostContext && m_restoreAllowed);
-    if ((m_contextLostMode == RealLostContext || m_contextLostMode == AutoRecoverSyntheticLostContext) && m_restoreAllowed)
-        m_restoreTimer.startOneShot(0);
-}
-
-void WebGLRenderingContext::maybeRestoreContext(Timer<WebGLRenderingContext>*)
-{
-    ASSERT(isContextLost());
-
-    // The rendering context is not restored unless the default behavior of the
-    // webglcontextlost event was prevented earlier.
-    //
-    // Because of the way m_restoreTimer is set up for real vs. synthetic lost
-    // context events, we don't have to worry about this test short-circuiting
-    // the retry loop for real context lost events.
-    if (!m_restoreAllowed)
-        return;
-
-    Frame* frame = canvas()->document().frame();
-    if (!frame)
-        return;
-
-    Settings* settings = frame->settings();
-
-    if (!frame->loader().client()->allowWebGL(settings && settings->webGLEnabled()))
-        return;
-
-    blink::WebGraphicsContext3D::Attributes attributes = m_requestedAttributes->attributes(canvas()->document().topDocument()->url().string(), settings);
-    OwnPtr<blink::WebGraphicsContext3D> context = adoptPtr(blink::Platform::current()->createOffscreenGraphicsContext3D(attributes));
-    if (!context) {
-        if (m_contextLostMode == RealLostContext) {
-            m_restoreTimer.startOneShot(secondsBetweenRestoreAttempts);
-        } else {
-            // This likely shouldn't happen but is the best way to report it to the WebGL app.
-            synthesizeGLError(GL_INVALID_OPERATION, "", "error restoring context");
-        }
-        return;
-    }
-
-    RefPtr<WebGLRenderingContextEvictionManager> contextEvictionManager = adoptRef(new WebGLRenderingContextEvictionManager());
-
-    // Construct a new drawing buffer with the new WebGraphicsContext3D.
-    m_drawingBuffer->releaseResources();
-    DrawingBuffer::PreserveDrawingBuffer preserve = m_requestedAttributes->preserveDrawingBuffer() ? DrawingBuffer::Preserve : DrawingBuffer::Discard;
-    m_drawingBuffer = DrawingBuffer::create(context.get(), clampedCanvasSize(), preserve, contextEvictionManager.release());
-
-    if (m_drawingBuffer->isZeroSized())
-        return;
-
-    m_drawingBuffer->bind();
-
-    m_lostContextErrors.clear();
-
-    m_context = context.release();
-    m_contextLost = false;
-
-    setupFlags();
-    initializeNewContext();
-    canvas()->dispatchEvent(WebGLContextEvent::create(EventTypeNames::webglcontextrestored, false, true, ""));
-}
-
-String WebGLRenderingContext::ensureNotNull(const String& text) const
-{
-    if (text.isNull())
-        return WTF::emptyString();
-    return text;
-}
-
-WebGLRenderingContext::LRUImageBufferCache::LRUImageBufferCache(int capacity)
-    : m_buffers(adoptArrayPtr(new OwnPtr<ImageBuffer>[capacity]))
-    , m_capacity(capacity)
-{
-}
-
-ImageBuffer* WebGLRenderingContext::LRUImageBufferCache::imageBuffer(const IntSize& size)
-{
-    int i;
-    for (i = 0; i < m_capacity; ++i) {
-        ImageBuffer* buf = m_buffers[i].get();
-        if (!buf)
-            break;
-        if (buf->size() != size)
-            continue;
-        bubbleToFront(i);
-        return buf;
-    }
-
-    OwnPtr<ImageBuffer> temp(ImageBuffer::create(size));
-    if (!temp)
-        return 0;
-    i = std::min(m_capacity - 1, i);
-    m_buffers[i] = temp.release();
-
-    ImageBuffer* buf = m_buffers[i].get();
-    bubbleToFront(i);
-    return buf;
-}
-
-void WebGLRenderingContext::LRUImageBufferCache::bubbleToFront(int idx)
-{
-    for (int i = idx; i > 0; --i)
-        m_buffers[i].swap(m_buffers[i-1]);
-}
-
-namespace {
-
-    String GetErrorString(GLenum error)
-    {
-        switch (error) {
-        case GL_INVALID_ENUM:
-            return "INVALID_ENUM";
-        case GL_INVALID_VALUE:
-            return "INVALID_VALUE";
-        case GL_INVALID_OPERATION:
-            return "INVALID_OPERATION";
-        case GL_OUT_OF_MEMORY:
-            return "OUT_OF_MEMORY";
-        case GL_INVALID_FRAMEBUFFER_OPERATION:
-            return "INVALID_FRAMEBUFFER_OPERATION";
-        case GC3D_CONTEXT_LOST_WEBGL:
-            return "CONTEXT_LOST_WEBGL";
-        default:
-            return String::format("WebGL ERROR(0x%04X)", error);
-        }
-    }
-
-} // namespace anonymous
-
-void WebGLRenderingContext::synthesizeGLError(GLenum error, const char* functionName, const char* description, ConsoleDisplayPreference display)
-{
-    String errorType = GetErrorString(error);
-    if (m_synthesizedErrorsToConsole && display == DisplayInConsole) {
-        String message = String("WebGL: ") + errorType +  ": " + String(functionName) + ": " + String(description);
-        printGLErrorToConsole(message);
-    }
-    if (!isContextLost())
-        m_context->synthesizeGLError(error);
-    else {
-        if (m_lostContextErrors.find(error) == WTF::kNotFound)
-            m_lostContextErrors.append(error);
-    }
-    InspectorInstrumentation::didFireWebGLError(canvas(), errorType);
-}
-
-void WebGLRenderingContext::emitGLWarning(const char* functionName, const char* description)
-{
-    if (m_synthesizedErrorsToConsole) {
-        String message = String("WebGL: ") + String(functionName) + ": " + String(description);
-        printGLErrorToConsole(message);
-    }
-    InspectorInstrumentation::didFireWebGLWarning(canvas());
-}
-
-void WebGLRenderingContext::applyStencilTest()
-{
-    bool haveStencilBuffer = false;
-
-    if (m_framebufferBinding)
-        haveStencilBuffer = m_framebufferBinding->hasStencilBuffer();
-    else {
-        RefPtr<WebGLContextAttributes> attributes = getContextAttributes();
-        haveStencilBuffer = attributes->stencil();
-    }
-    enableOrDisable(GL_STENCIL_TEST,
-                    m_stencilEnabled && haveStencilBuffer);
-}
-
-void WebGLRenderingContext::enableOrDisable(GLenum capability, bool enable)
-{
-    if (isContextLost())
-        return;
-    if (enable)
-        m_context->enable(capability);
-    else
-        m_context->disable(capability);
-}
-
-IntSize WebGLRenderingContext::clampedCanvasSize()
-{
-    return IntSize(clamp(canvas()->width(), 1, m_maxViewportDims[0]),
-                   clamp(canvas()->height(), 1, m_maxViewportDims[1]));
-}
-
-GLint WebGLRenderingContext::maxDrawBuffers()
-{
-    if (isContextLost() || !m_webglDrawBuffers)
-        return 0;
-    if (!m_maxDrawBuffers)
-        m_context->getIntegerv(GL_MAX_DRAW_BUFFERS_EXT, &m_maxDrawBuffers);
-    if (!m_maxColorAttachments)
-        m_context->getIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &m_maxColorAttachments);
-    // WEBGL_draw_buffers requires MAX_COLOR_ATTACHMENTS >= MAX_DRAW_BUFFERS.
-    return std::min(m_maxDrawBuffers, m_maxColorAttachments);
-}
-
-GLint WebGLRenderingContext::maxColorAttachments()
-{
-    if (isContextLost() || !m_webglDrawBuffers)
-        return 0;
-    if (!m_maxColorAttachments)
-        m_context->getIntegerv(GL_MAX_COLOR_ATTACHMENTS_EXT, &m_maxColorAttachments);
-    return m_maxColorAttachments;
-}
-
-void WebGLRenderingContext::setBackDrawBuffer(GLenum buf)
-{
-    m_backDrawBuffer = buf;
-}
-
-void WebGLRenderingContext::restoreCurrentFramebuffer()
-{
-    bindFramebuffer(GL_FRAMEBUFFER, m_framebufferBinding.get());
-}
-
-void WebGLRenderingContext::restoreCurrentTexture2D()
-{
-    bindTexture(GL_TEXTURE_2D, m_textureUnits[m_activeTextureUnit].m_texture2DBinding.get());
-}
-
-void WebGLRenderingContext::multisamplingChanged(bool enabled)
-{
-    if (m_multisamplingAllowed != enabled) {
-        m_multisamplingAllowed = enabled;
-        forceLostContext(WebGLRenderingContext::AutoRecoverSyntheticLostContext);
-    }
-}
-
-void WebGLRenderingContext::findNewMaxEnabledAttribIndex()
-{
-    // Trace backwards from the current max to find the new max enabled attrib index
-    int startIndex = m_onePlusMaxEnabledAttribIndex - 1;
-    for (int i = startIndex; i >= 0; --i) {
-        if (m_boundVertexArrayObject->getVertexAttribState(i).enabled) {
-            m_onePlusMaxEnabledAttribIndex = i + 1;
-            return;
-        }
-    }
-    m_onePlusMaxEnabledAttribIndex = 0;
-}
-
-void WebGLRenderingContext::findNewMaxNonDefaultTextureUnit()
-{
-    // Trace backwards from the current max to find the new max non-default texture unit
-    int startIndex = m_onePlusMaxNonDefaultTextureUnit - 1;
-    for (int i = startIndex; i >= 0; --i) {
-        if (m_textureUnits[i].m_texture2DBinding
-            || m_textureUnits[i].m_textureCubeMapBinding) {
-            m_onePlusMaxNonDefaultTextureUnit = i + 1;
-            return;
-        }
-    }
-    m_onePlusMaxNonDefaultTextureUnit = 0;
-}
-
 } // namespace WebCore