Moved the majority of WebGL functionality into WebGLRenderingContextBase

Source/core/html/canvas/WebGLRenderingContext.h

 /*
  * 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.
  */
 
 #ifndef WebGLRenderingContext_h
 #define WebGLRenderingContext_h
 
-#include "core/dom/ActiveDOMObject.h"
-#include "core/html/canvas/CanvasRenderingContext.h"
-#include "core/html/canvas/WebGLGetInfo.h"
-#include "core/page/Page.h"
-#include "platform/Timer.h"
-#include "platform/graphics/GraphicsTypes3D.h"
-#include "platform/graphics/ImageBuffer.h"
-#include "platform/graphics/gpu/Extensions3DUtil.h"
-#include "platform/graphics/gpu/WebGLImageConversion.h"
-#include "public/platform/WebGraphicsContext3D.h"
-#include "wtf/Float32Array.h"
-#include "wtf/Int32Array.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/text/WTFString.h"
-
-namespace blink {
-class WebLayer;
-}
+#include "core/html/canvas/WebGLRenderingContextBase.h"
 
 namespace WebCore {
 
-class ANGLEInstancedArrays;
-class DrawingBuffer;
-class EXTFragDepth;
-class EXTTextureFilterAnisotropic;
-class ExceptionState;
-class HTMLImageElement;
-class HTMLVideoElement;
-class ImageBuffer;
-class ImageData;
-class IntSize;
-class OESElementIndexUint;
-class OESStandardDerivatives;
-class OESTextureFloat;
-class OESTextureFloatLinear;
-class OESTextureHalfFloat;
-class OESTextureHalfFloatLinear;
-class OESVertexArrayObject;
-class WebGLActiveInfo;
-class WebGLBuffer;
-class WebGLCompressedTextureATC;
-class WebGLCompressedTexturePVRTC;
-class WebGLCompressedTextureS3TC;
-class WebGLContextAttributes;
-class WebGLContextGroup;
-class WebGLContextObject;
-class WebGLDebugRendererInfo;
-class WebGLDebugShaders;
-class WebGLDepthTexture;
-class WebGLDrawBuffers;
-class WebGLExtension;
-class WebGLFramebuffer;
-class WebGLLoseContext;
-class WebGLObject;
-class WebGLProgram;
-class WebGLRenderbuffer;
-class WebGLShader;
-class WebGLShaderPrecisionFormat;
-class WebGLSharedObject;
-class WebGLTexture;
-class WebGLUniformLocation;
-class WebGLVertexArrayObjectOES;
-
-class WebGLRenderingContextLostCallback;
-class WebGLRenderingContextErrorMessageCallback;
-
-class WebGLRenderingContext FINAL : public CanvasRenderingContext, public ActiveDOMObject, private Page::MultisamplingChangedObserver {
+class WebGLRenderingContext FINAL : public WebGLRenderingContextBase {
 public:
     static PassOwnPtr<WebGLRenderingContext> create(HTMLCanvasElement*, WebGLContextAttributes*);
     virtual ~WebGLRenderingContext();
 
-    virtual bool is3d() const OVERRIDE { return true; }
-    virtual bool isAccelerated() const OVERRIDE { return true; }
+    virtual unsigned version() const OVERRIDE { return 1; }
+    virtual String contextName() const OVERRIDE { return "WebGLRenderingContext"; }
+    virtual void registerContextExtensions() OVERRIDE;
 
-    int drawingBufferWidth() const;
-    int drawingBufferHeight() const;
-
-    void activeTexture(GLenum texture);
-    void attachShader(WebGLProgram*, WebGLShader*);
-    void bindAttribLocation(WebGLProgram*, GLuint index, const String& name);
-    void bindBuffer(GLenum target, WebGLBuffer*);
-    void bindFramebuffer(GLenum target, WebGLFramebuffer*);
-    void bindRenderbuffer(GLenum target, WebGLRenderbuffer*);
-    void bindTexture(GLenum target, WebGLTexture*);
-    void blendColor(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
-    void blendEquation(GLenum mode);
-    void blendEquationSeparate(GLenum modeRGB, GLenum modeAlpha);
-    void blendFunc(GLenum sfactor, GLenum dfactor);
-    void blendFuncSeparate(GLenum srcRGB, GLenum dstRGB, GLenum srcAlpha, GLenum dstAlpha);
-
-    void bufferData(GLenum target, long long size, GLenum usage);
-    void bufferData(GLenum target, ArrayBuffer* data, GLenum usage);
-    void bufferData(GLenum target, ArrayBufferView* data, GLenum usage);
-    void bufferSubData(GLenum target, long long offset, ArrayBuffer* data);
-    void bufferSubData(GLenum target, long long offset, ArrayBufferView* data);
-
-    GLenum checkFramebufferStatus(GLenum target);
-    void clear(GLbitfield mask);
-    void clearColor(GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha);
-    void clearDepth(GLfloat);
-    void clearStencil(GLint);
-    void colorMask(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha);
-    void compileShader(WebGLShader*);
-
-    void compressedTexImage2D(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, ArrayBufferView* data);
-    void compressedTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, ArrayBufferView* data);
-
-    void copyTexImage2D(GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width, GLsizei height, GLint border);
-    void copyTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height);
-
-    PassRefPtr<WebGLBuffer> createBuffer();
-    PassRefPtr<WebGLFramebuffer> createFramebuffer();
-    PassRefPtr<WebGLProgram> createProgram();
-    PassRefPtr<WebGLRenderbuffer> createRenderbuffer();
-    PassRefPtr<WebGLShader> createShader(GLenum type);
-    PassRefPtr<WebGLTexture> createTexture();
-
-    void cullFace(GLenum mode);
-
-    void deleteBuffer(WebGLBuffer*);
-    void deleteFramebuffer(WebGLFramebuffer*);
-    void deleteProgram(WebGLProgram*);
-    void deleteRenderbuffer(WebGLRenderbuffer*);
-    void deleteShader(WebGLShader*);
-    void deleteTexture(WebGLTexture*);
-
-    void depthFunc(GLenum);
-    void depthMask(GLboolean);
-    void depthRange(GLfloat zNear, GLfloat zFar);
-    void detachShader(WebGLProgram*, WebGLShader*);
-    void disable(GLenum cap);
-    void disableVertexAttribArray(GLuint index);
-    void drawArrays(GLenum mode, GLint first, GLsizei count);
-    void drawElements(GLenum mode, GLsizei count, GLenum type, long long offset);
-
-    void drawArraysInstancedANGLE(GLenum mode, GLint first, GLsizei count, GLsizei primcount);
-    void drawElementsInstancedANGLE(GLenum mode, GLsizei count, GLenum type, GLintptr offset, GLsizei primcount);
-
-    void enable(GLenum cap);
-    void enableVertexAttribArray(GLuint index);
-    void finish();
-    void flush();
-    void framebufferRenderbuffer(GLenum target, GLenum attachment, GLenum renderbuffertarget, WebGLRenderbuffer*);
-    void framebufferTexture2D(GLenum target, GLenum attachment, GLenum textarget, WebGLTexture*, GLint level);
-    void frontFace(GLenum mode);
-    void generateMipmap(GLenum target);
-
-    PassRefPtr<WebGLActiveInfo> getActiveAttrib(WebGLProgram*, GLuint index);
-    PassRefPtr<WebGLActiveInfo> getActiveUniform(WebGLProgram*, GLuint index);
-    bool getAttachedShaders(WebGLProgram*, Vector<RefPtr<WebGLShader> >&);
-    GLint getAttribLocation(WebGLProgram*, const String& name);
-    WebGLGetInfo getBufferParameter(GLenum target, GLenum pname);
-    PassRefPtr<WebGLContextAttributes> getContextAttributes();
-    GLenum getError();
-    PassRefPtr<WebGLExtension> getExtension(const String& name);
-    WebGLGetInfo getFramebufferAttachmentParameter(GLenum target, GLenum attachment, GLenum pname);
-    WebGLGetInfo getParameter(GLenum pname);
-    WebGLGetInfo getProgramParameter(WebGLProgram*, GLenum pname);
-    String getProgramInfoLog(WebGLProgram*);
-    WebGLGetInfo getRenderbufferParameter(GLenum target, GLenum pname);
-    WebGLGetInfo getShaderParameter(WebGLShader*, GLenum pname);
-    String getShaderInfoLog(WebGLShader*);
-    PassRefPtr<WebGLShaderPrecisionFormat> getShaderPrecisionFormat(GLenum shaderType, GLenum precisionType);
-    String getShaderSource(WebGLShader*);
-    Vector<String> getSupportedExtensions();
-    WebGLGetInfo getTexParameter(GLenum target, GLenum pname);
-    WebGLGetInfo getUniform(WebGLProgram*, const WebGLUniformLocation*);
-    PassRefPtr<WebGLUniformLocation> getUniformLocation(WebGLProgram*, const String&);
-    WebGLGetInfo getVertexAttrib(GLuint index, GLenum pname);
-    long long getVertexAttribOffset(GLuint index, GLenum pname);
-
-    void hint(GLenum target, GLenum mode);
-    GLboolean isBuffer(WebGLBuffer*);
-    bool isContextLost();
-    GLboolean isEnabled(GLenum cap);
-    GLboolean isFramebuffer(WebGLFramebuffer*);
-    GLboolean isProgram(WebGLProgram*);
-    GLboolean isRenderbuffer(WebGLRenderbuffer*);
-    GLboolean isShader(WebGLShader*);
-    GLboolean isTexture(WebGLTexture*);
-
-    void lineWidth(GLfloat);
-    void linkProgram(WebGLProgram*);
-    void pixelStorei(GLenum pname, GLint param);
-    void polygonOffset(GLfloat factor, GLfloat units);
-    void readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, ArrayBufferView* pixels);
-    void renderbufferStorage(GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
-    void sampleCoverage(GLfloat value, GLboolean invert);
-    void scissor(GLint x, GLint y, GLsizei width, GLsizei height);
-    void shaderSource(WebGLShader*, const String&);
-    void stencilFunc(GLenum func, GLint ref, GLuint mask);
-    void stencilFuncSeparate(GLenum face, GLenum func, GLint ref, GLuint mask);
-    void stencilMask(GLuint);
-    void stencilMaskSeparate(GLenum face, GLuint mask);
-    void stencilOp(GLenum fail, GLenum zfail, GLenum zpass);
-    void stencilOpSeparate(GLenum face, GLenum fail, GLenum zfail, GLenum zpass);
-
-    void texImage2D(GLenum target, GLint level, GLenum internalformat,
-        GLsizei width, GLsizei height, GLint border,
-        GLenum format, GLenum type, ArrayBufferView*, ExceptionState&);
-    void texImage2D(GLenum target, GLint level, GLenum internalformat,
-        GLenum format, GLenum type, ImageData*, ExceptionState&);
-    void texImage2D(GLenum target, GLint level, GLenum internalformat,
-        GLenum format, GLenum type, HTMLImageElement*, ExceptionState&);
-    void texImage2D(GLenum target, GLint level, GLenum internalformat,
-        GLenum format, GLenum type, HTMLCanvasElement*, ExceptionState&);
-    void texImage2D(GLenum target, GLint level, GLenum internalformat,
-        GLenum format, GLenum type, HTMLVideoElement*, ExceptionState&);
-
-    void texParameterf(GLenum target, GLenum pname, GLfloat param);
-    void texParameteri(GLenum target, GLenum pname, GLint param);
-
-    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
-        GLsizei width, GLsizei height,
-        GLenum format, GLenum type, ArrayBufferView*, ExceptionState&);
-    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
-        GLenum format, GLenum type, ImageData*, ExceptionState&);
-    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
-        GLenum format, GLenum type, HTMLImageElement*, ExceptionState&);
-    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
-        GLenum format, GLenum type, HTMLCanvasElement*, ExceptionState&);
-    void texSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset,
-        GLenum format, GLenum type, HTMLVideoElement*, ExceptionState&);
-
-    void uniform1f(const WebGLUniformLocation*, GLfloat x);
-    void uniform1fv(const WebGLUniformLocation*, Float32Array* v);
-    void uniform1fv(const WebGLUniformLocation*, GLfloat* v, GLsizei);
-    void uniform1i(const WebGLUniformLocation*, GLint x);
-    void uniform1iv(const WebGLUniformLocation*, Int32Array* v);
-    void uniform1iv(const WebGLUniformLocation*, GLint* v, GLsizei);
-    void uniform2f(const WebGLUniformLocation*, GLfloat x, GLfloat y);
-    void uniform2fv(const WebGLUniformLocation*, Float32Array* v);
-    void uniform2fv(const WebGLUniformLocation*, GLfloat* v, GLsizei);
-    void uniform2i(const WebGLUniformLocation*, GLint x, GLint y);
-    void uniform2iv(const WebGLUniformLocation*, Int32Array* v);
-    void uniform2iv(const WebGLUniformLocation*, GLint* v, GLsizei);
-    void uniform3f(const WebGLUniformLocation*, GLfloat x, GLfloat y, GLfloat z);
-    void uniform3fv(const WebGLUniformLocation*, Float32Array* v);
-    void uniform3fv(const WebGLUniformLocation*, GLfloat* v, GLsizei);
-    void uniform3i(const WebGLUniformLocation*, GLint x, GLint y, GLint z);
-    void uniform3iv(const WebGLUniformLocation*, Int32Array* v);
-    void uniform3iv(const WebGLUniformLocation*, GLint* v, GLsizei);
-    void uniform4f(const WebGLUniformLocation*, GLfloat x, GLfloat y, GLfloat z, GLfloat w);
-    void uniform4fv(const WebGLUniformLocation*, Float32Array* v);
-    void uniform4fv(const WebGLUniformLocation*, GLfloat* v, GLsizei);
-    void uniform4i(const WebGLUniformLocation*, GLint x, GLint y, GLint z, GLint w);
-    void uniform4iv(const WebGLUniformLocation*, Int32Array* v);
-    void uniform4iv(const WebGLUniformLocation*, GLint* v, GLsizei);
-    void uniformMatrix2fv(const WebGLUniformLocation*, GLboolean transpose, Float32Array* value);
-    void uniformMatrix2fv(const WebGLUniformLocation*, GLboolean transpose, GLfloat* value, GLsizei);
-    void uniformMatrix3fv(const WebGLUniformLocation*, GLboolean transpose, Float32Array* value);
-    void uniformMatrix3fv(const WebGLUniformLocation*, GLboolean transpose, GLfloat* value, GLsizei);
-    void uniformMatrix4fv(const WebGLUniformLocation*, GLboolean transpose, Float32Array* value);
-    void uniformMatrix4fv(const WebGLUniformLocation*, GLboolean transpose, GLfloat* value, GLsizei);
-
-    void useProgram(WebGLProgram*);
-    void validateProgram(WebGLProgram*);
-
-    void vertexAttrib1f(GLuint index, GLfloat x);
-    void vertexAttrib1fv(GLuint index, Float32Array* values);
-    void vertexAttrib1fv(GLuint index, GLfloat* values, GLsizei);
-    void vertexAttrib2f(GLuint index, GLfloat x, GLfloat y);
-    void vertexAttrib2fv(GLuint index, Float32Array* values);
-    void vertexAttrib2fv(GLuint index, GLfloat* values, GLsizei);
-    void vertexAttrib3f(GLuint index, GLfloat x, GLfloat y, GLfloat z);
-    void vertexAttrib3fv(GLuint index, Float32Array* values);
-    void vertexAttrib3fv(GLuint index, GLfloat* values, GLsizei);
-    void vertexAttrib4f(GLuint index, GLfloat x, GLfloat y, GLfloat z, GLfloat w);
-    void vertexAttrib4fv(GLuint index, Float32Array* values);
-    void vertexAttrib4fv(GLuint index, GLfloat* values, GLsizei);
-    void vertexAttribPointer(GLuint index, GLint size, GLenum type, GLboolean normalized,
-        GLsizei stride, long long offset);
-
-    void vertexAttribDivisorANGLE(GLuint index, GLuint divisor);
-
-    void viewport(GLint x, GLint y, GLsizei width, GLsizei height);
-
-    // WEBKIT_lose_context support
-    enum LostContextMode {
-        // Lost context occurred at the graphics system level.
-        RealLostContext,
-
-        // Lost context provoked by WEBKIT_lose_context.
-        SyntheticLostContext,
-
-        // A synthetic lost context that should attempt to recover automatically
-        AutoRecoverSyntheticLostContext
-    };
-    void forceLostContext(LostContextMode);
-    void forceRestoreContext();
-    void loseContextImpl(LostContextMode);
-
-    blink::WebGraphicsContext3D* webGraphicsContext3D() const { return m_context.get(); }
-    WebGLContextGroup* contextGroup() const { return m_contextGroup.get(); }
-    virtual blink::WebLayer* platformLayer() const OVERRIDE;
-    Extensions3DUtil* extensionsUtil();
-
-    void reshape(int width, int height);
-
-    void markLayerComposited();
-    virtual void paintRenderingResultsToCanvas() OVERRIDE;
-    PassRefPtr<ImageData> paintRenderingResultsToImageData();
-
-    void removeSharedObject(WebGLSharedObject*);
-    void removeContextObject(WebGLContextObject*);
-
-    unsigned maxVertexAttribs() const { return m_maxVertexAttribs; }
-
-    // ActiveDOMObject notifications
-    virtual bool hasPendingActivity() const OVERRIDE;
-    virtual void stop() OVERRIDE;
-
-  private:
-    friend class WebGLDrawBuffers;
-    friend class WebGLFramebuffer;
-    friend class WebGLObject;
-    friend class OESVertexArrayObject;
-    friend class WebGLDebugShaders;
-    friend class WebGLCompressedTextureATC;
-    friend class WebGLCompressedTexturePVRTC;
-    friend class WebGLCompressedTextureS3TC;
-    friend class WebGLRenderingContextErrorMessageCallback;
-    friend class WebGLVertexArrayObjectOES;
-
+private:
     WebGLRenderingContext(HTMLCanvasElement*, PassOwnPtr<blink::WebGraphicsContext3D>, WebGLContextAttributes*);
-    void initializeNewContext();
-    void setupFlags();
-
-    void addSharedObject(WebGLSharedObject*);
-    void addContextObject(WebGLContextObject*);
-    void detachAndRemoveAllObjects();
-
-    void destroyContext();
-    void markContextChanged();
-
-    // Query if the GL implementation is NPOT strict.
-    bool isGLES2NPOTStrict() { return m_isGLES2NPOTStrict; }
-    // Query if depth_stencil buffer is supported.
-    bool isDepthStencilSupported() { return m_isDepthStencilSupported; }
-
-    // Helper to return the size in bytes of OpenGL data types
-    // like GL_FLOAT, GL_INT, etc.
-    unsigned sizeInBytes(GLenum type);
-
-    // Check if each enabled vertex attribute is bound to a buffer.
-    bool validateRenderingState(const char*);
-
-    bool validateWebGLObject(const char*, WebGLObject*);
-
-    // Adds a compressed texture format.
-    void addCompressedTextureFormat(GLenum);
-    void removeAllCompressedTextureFormats();
-
-    PassRefPtr<Image> drawImageIntoBuffer(Image*, int width, int height);
-
-    PassRefPtr<Image> videoFrameToImage(HTMLVideoElement*, BackingStoreCopy);
-
-    WebGLRenderbuffer* ensureEmulatedStencilBuffer(GLenum target, WebGLRenderbuffer*);
-
-    OwnPtr<blink::WebGraphicsContext3D> m_context;
-    RefPtr<WebGLContextGroup> m_contextGroup;
-
-    // Structure for rendering to a DrawingBuffer, instead of directly
-    // to the back-buffer of m_context.
-    RefPtr<DrawingBuffer> m_drawingBuffer;
-
-    // Dispatches a context lost event once it is determined that one is needed.
-    // This is used both for synthetic and real context losses. For real ones, it's
-    // likely that there's no JavaScript on the stack, but that might be dependent
-    // on how exactly the platform discovers that the context was lost. For better
-    // portability we always defer the dispatch of the event.
-    Timer<WebGLRenderingContext> m_dispatchContextLostEventTimer;
-    bool m_restoreAllowed;
-    Timer<WebGLRenderingContext> m_restoreTimer;
-
-    bool m_needsUpdate;
-    bool m_markedCanvasDirty;
-    HashSet<WebGLContextObject*> m_contextObjects;
-
-    OwnPtr<WebGLRenderingContextLostCallback> m_contextLostCallbackAdapter;
-    OwnPtr<WebGLRenderingContextErrorMessageCallback> m_errorMessageCallbackAdapter;
-
-    // List of bound VBO's. Used to maintain info about sizes for ARRAY_BUFFER and stored values for ELEMENT_ARRAY_BUFFER
-    RefPtr<WebGLBuffer> m_boundArrayBuffer;
-
-    RefPtr<WebGLVertexArrayObjectOES> m_defaultVertexArrayObject;
-    RefPtr<WebGLVertexArrayObjectOES> m_boundVertexArrayObject;
-    void setBoundVertexArrayObject(PassRefPtr<WebGLVertexArrayObjectOES> arrayObject)
-    {
-        if (arrayObject)
-            m_boundVertexArrayObject = arrayObject;
-        else
-            m_boundVertexArrayObject = m_defaultVertexArrayObject;
-    }
-
-    class VertexAttribValue {
-    public:
-        VertexAttribValue()
-        {
-            initValue();
-        }
-
-        void initValue()
-        {
-            value[0] = 0.0f;
-            value[1] = 0.0f;
-            value[2] = 0.0f;
-            value[3] = 1.0f;
-        }
-
-        GLfloat value[4];
-    };
-    Vector<VertexAttribValue> m_vertexAttribValue;
-    unsigned m_maxVertexAttribs;
-    RefPtr<WebGLBuffer> m_vertexAttrib0Buffer;
-    long m_vertexAttrib0BufferSize;
-    GLfloat m_vertexAttrib0BufferValue[4];
-    bool m_forceAttrib0BufferRefill;
-    bool m_vertexAttrib0UsedBefore;
-
-    RefPtr<WebGLProgram> m_currentProgram;
-    RefPtr<WebGLFramebuffer> m_framebufferBinding;
-    RefPtr<WebGLRenderbuffer> m_renderbufferBinding;
-    class TextureUnitState {
-    public:
-        RefPtr<WebGLTexture> m_texture2DBinding;
-        RefPtr<WebGLTexture> m_textureCubeMapBinding;
-    };
-    Vector<TextureUnitState> m_textureUnits;
-    unsigned long m_activeTextureUnit;
-
-    RefPtr<WebGLTexture> m_blackTexture2D;
-    RefPtr<WebGLTexture> m_blackTextureCubeMap;
-
-    Vector<GLenum> m_compressedTextureFormats;
-
-    // Fixed-size cache of reusable image buffers for video texImage2D calls.
-    class LRUImageBufferCache {
-    public:
-        LRUImageBufferCache(int capacity);
-        // The pointer returned is owned by the image buffer map.
-        ImageBuffer* imageBuffer(const IntSize& size);
-    private:
-        void bubbleToFront(int idx);
-        OwnPtr<OwnPtr<ImageBuffer>[]> m_buffers;
-        int m_capacity;
-    };
-    LRUImageBufferCache m_generatedImageCache;
-
-    GLint m_maxTextureSize;
-    GLint m_maxCubeMapTextureSize;
-    GLint m_maxRenderbufferSize;
-    GLint m_maxViewportDims[2];
-    GLint m_maxTextureLevel;
-    GLint m_maxCubeMapTextureLevel;
-
-    GLint m_maxDrawBuffers;
-    GLint m_maxColorAttachments;
-    GLenum m_backDrawBuffer;
-    bool m_drawBuffersWebGLRequirementsChecked;
-    bool m_drawBuffersSupported;
-
-    GLint m_packAlignment;
-    GLint m_unpackAlignment;
-    bool m_unpackFlipY;
-    bool m_unpackPremultiplyAlpha;
-    GLenum m_unpackColorspaceConversion;
-    bool m_contextLost;
-    LostContextMode m_contextLostMode;
-    RefPtr<WebGLContextAttributes> m_requestedAttributes;
-
-    bool m_layerCleared;
-    GLfloat m_clearColor[4];
-    bool m_scissorEnabled;
-    GLfloat m_clearDepth;
-    GLint m_clearStencil;
-    GLboolean m_colorMask[4];
-    GLboolean m_depthMask;
-
-    bool m_stencilEnabled;
-    GLuint m_stencilMask, m_stencilMaskBack;
-    GLint m_stencilFuncRef, m_stencilFuncRefBack; // Note that these are the user specified values, not the internal clamped value.
-    GLuint m_stencilFuncMask, m_stencilFuncMaskBack;
-
-    bool m_isGLES2NPOTStrict;
-    bool m_isDepthStencilSupported;
-
-    bool m_synthesizedErrorsToConsole;
-    int m_numGLErrorsToConsoleAllowed;
-
-    bool m_multisamplingAllowed;
-    bool m_multisamplingObserverRegistered;
-
-    GLuint m_onePlusMaxEnabledAttribIndex;
-    unsigned long m_onePlusMaxNonDefaultTextureUnit;
-
-    OwnPtr<Extensions3DUtil> m_extensionsUtil;
 
     // Enabled extension objects.
     RefPtr<ANGLEInstancedArrays> m_angleInstancedArrays;
     RefPtr<EXTFragDepth> m_extFragDepth;
     RefPtr<EXTTextureFilterAnisotropic> m_extTextureFilterAnisotropic;
     RefPtr<OESTextureFloat> m_oesTextureFloat;
     RefPtr<OESTextureFloatLinear> m_oesTextureFloatLinear;
     RefPtr<OESTextureHalfFloat> m_oesTextureHalfFloat;
     RefPtr<OESTextureHalfFloatLinear> m_oesTextureHalfFloatLinear;
     RefPtr<OESStandardDerivatives> m_oesStandardDerivatives;
     RefPtr<OESVertexArrayObject> m_oesVertexArrayObject;
     RefPtr<OESElementIndexUint> m_oesElementIndexUint;
     RefPtr<WebGLLoseContext> m_webglLoseContext;
     RefPtr<WebGLDebugRendererInfo> m_webglDebugRendererInfo;
     RefPtr<WebGLDebugShaders> m_webglDebugShaders;
     RefPtr<WebGLDrawBuffers> m_webglDrawBuffers;
     RefPtr<WebGLCompressedTextureATC> m_webglCompressedTextureATC;
     RefPtr<WebGLCompressedTexturePVRTC> m_webglCompressedTexturePVRTC;
     RefPtr<WebGLCompressedTextureS3TC> m_webglCompressedTextureS3TC;
     RefPtr<WebGLDepthTexture> m_webglDepthTexture;
-
-    enum ExtensionFlags {
-        ApprovedExtension   = 0x00,
-        DraftExtension      = 0x01,
-        PrivilegedExtension = 0x02,
-        PrefixedExtension   = 0x04,
-        WebGLDebugRendererInfoExtension = 0x08,
-    };
-
-    class ExtensionTracker {
-    public:
-        ExtensionTracker(ExtensionFlags flags, const char* const* prefixes)
-            : m_privileged(flags & PrivilegedExtension)
-            , m_draft(flags & DraftExtension)
-            , m_prefixed(flags & PrefixedExtension)
-            , m_webglDebugRendererInfo(flags & WebGLDebugRendererInfoExtension)
-            , m_prefixes(prefixes)
-        {
-        }
-
-        virtual ~ExtensionTracker()
-        {
-        }
-
-        bool prefixed() const
-        {
-            return m_prefixed;
-        }
-
-        bool privileged() const
-        {
-            return m_privileged;
-        }
-
-        bool draft() const
-        {
-            return m_draft;
-        }
-
-        bool webglDebugRendererInfo() const
-        {
-            return m_webglDebugRendererInfo;
-        }
-
-        bool matchesNameWithPrefixes(const String&) const;
-
-        virtual PassRefPtr<WebGLExtension> getExtension(WebGLRenderingContext*) const = 0;
-        virtual bool supported(WebGLRenderingContext*) const = 0;
-        virtual const char* extensionName() const = 0;
-        virtual void loseExtension() = 0;
-
-    private:
-        bool m_privileged;
-        bool m_draft;
-        bool m_prefixed;
-        bool m_webglDebugRendererInfo;
-        const char* const* m_prefixes;
-    };
-
-    template <typename T>
-    class TypedExtensionTracker FINAL : public ExtensionTracker {
-    public:
-        TypedExtensionTracker(RefPtr<T>& extensionField, ExtensionFlags flags, const char* const* prefixes)
-            : ExtensionTracker(flags, prefixes)
-            , m_extensionField(extensionField)
-        {
-        }
-
-        virtual ~TypedExtensionTracker()
-        {
-            if (m_extensionField) {
-                m_extensionField->lose(true);
-                m_extensionField = nullptr;
-            }
-        }
-
-        virtual PassRefPtr<WebGLExtension> getExtension(WebGLRenderingContext* context) const OVERRIDE
-        {
-            if (!m_extensionField)
-                m_extensionField = T::create(context);
-
-            return m_extensionField;
-        }
-
-        virtual bool supported(WebGLRenderingContext* context) const OVERRIDE
-        {
-            return T::supported(context);
-        }
-
-        virtual const char* extensionName() const OVERRIDE
-        {
-            return T::extensionName();
-        }
-
-        virtual void loseExtension() OVERRIDE
-        {
-            if (m_extensionField) {
-                m_extensionField->lose(false);
-                if (m_extensionField->isLost())
-                    m_extensionField = nullptr;
-            }
-        }
-
-    private:
-        RefPtr<T>& m_extensionField;
-    };
-
-    Vector<ExtensionTracker*> m_extensions;
-
-    template <typename T>
-    void registerExtension(RefPtr<T>& extensionPtr, ExtensionFlags flags = ApprovedExtension, const char* const* prefixes = 0)
-    {
-        m_extensions.append(new TypedExtensionTracker<T>(extensionPtr, flags, prefixes));
-    }
-
-    // Errors raised by synthesizeGLError() while the context is lost.
-    Vector<GLenum> m_lostContextErrors;
-
-    // Helpers for getParameter and others
-    WebGLGetInfo getBooleanParameter(GLenum);
-    WebGLGetInfo getBooleanArrayParameter(GLenum);
-    WebGLGetInfo getFloatParameter(GLenum);
-    WebGLGetInfo getIntParameter(GLenum);
-    WebGLGetInfo getUnsignedIntParameter(GLenum);
-    WebGLGetInfo getWebGLFloatArrayParameter(GLenum);
-    WebGLGetInfo getWebGLIntArrayParameter(GLenum);
-
-    // Clear the backbuffer if it was composited since the last operation.
-    // clearMask is set to the bitfield of any clear that would happen anyway at this time
-    // and the function returns true if that clear is now unnecessary.
-    bool clearIfComposited(GLbitfield clearMask = 0);
-
-    // Helper to restore state that clearing the framebuffer may destroy.
-    void restoreStateAfterClear();
-
-    // Convert texture internal format.
-    GLenum convertTexInternalFormat(GLenum internalformat, GLenum type);
-
-    void texImage2DBase(GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const void* pixels, ExceptionState&);
-    void texImage2DImpl(GLenum target, GLint level, GLenum internalformat, GLenum format, GLenum type, Image*, WebGLImageConversion::ImageHtmlDomSource, bool flipY, bool premultiplyAlpha, ExceptionState&);
-    void texSubImage2DBase(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const void* pixels, ExceptionState&);
-    void texSubImage2DImpl(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLenum format, GLenum type, Image*, WebGLImageConversion::ImageHtmlDomSource, bool flipY, bool premultiplyAlpha, ExceptionState&);
-
-    void handleTextureCompleteness(const char*, bool);
-    void createFallbackBlackTextures1x1();
-
-    // Helper function for copyTex{Sub}Image, check whether the internalformat
-    // and the color buffer format of the current bound framebuffer combination
-    // is valid.
-    bool isTexInternalFormatColorBufferCombinationValid(GLenum texInternalFormat, GLenum colorBufferFormat);
-
-    // Helper function to get the bound framebuffer's color buffer format.
-    GLenum boundFramebufferColorFormat();
-
-    // Helper function to verify limits on the length of uniform and attribute locations.
-    bool validateLocationLength(const char* functionName, const String&);
-
-    // Helper function to check if size is non-negative.
-    // Generate GL error and return false for negative inputs; otherwise, return true.
-    bool validateSize(const char* functionName, GLint x, GLint y);
-
-    // Helper function to check if all characters in the string belong to the
-    // ASCII subset as defined in GLSL ES 1.0 spec section 3.1.
-    bool validateString(const char* functionName, const String&);
-
-    // Helper function to check target and texture bound to the target.
-    // Generate GL errors and return 0 if target is invalid or texture bound is
-    // null.  Otherwise, return the texture bound to the target.
-    WebGLTexture* validateTextureBinding(const char* functionName, GLenum target, bool useSixEnumsForCubeMap);
-
-    // Helper function to check input format/type for functions {copy}Tex{Sub}Image.
-    // Generates GL error and returns false if parameters are invalid.
-    bool validateTexFuncFormatAndType(const char* functionName, GLenum format, GLenum type, GLint level);
-
-    // Helper function to check input level for functions {copy}Tex{Sub}Image.
-    // Generates GL error and returns false if level is invalid.
-    bool validateTexFuncLevel(const char* functionName, GLenum target, GLint level);
-
-    enum TexFuncValidationFunctionType {
-        NotTexSubImage2D,
-        TexSubImage2D,
-    };
-
-    enum TexFuncValidationSourceType {
-        SourceArrayBufferView,
-        SourceImageData,
-        SourceHTMLImageElement,
-        SourceHTMLCanvasElement,
-        SourceHTMLVideoElement,
-    };
-
-    // Helper function for tex{Sub}Image2D to check if the input format/type/level/target/width/height/border/xoffset/yoffset are valid.
-    // Otherwise, it would return quickly without doing other work.
-    bool validateTexFunc(const char* functionName, TexFuncValidationFunctionType, TexFuncValidationSourceType, GLenum target, GLint level, GLenum internalformat, GLsizei width,
-        GLsizei height, GLint border, GLenum format, GLenum type, GLint xoffset, GLint yoffset);
-
-    // Helper function to check input width and height for functions {copy, compressed}Tex{Sub}Image.
-    // Generates GL error and returns false if width or height is invalid.
-    bool validateTexFuncDimensions(const char* functionName, TexFuncValidationFunctionType, GLenum target, GLint level, GLsizei width, GLsizei height);
-
-    // Helper function to check input parameters for functions {copy}Tex{Sub}Image.
-    // Generates GL error and returns false if parameters are invalid.
-    bool validateTexFuncParameters(const char* functionName, TexFuncValidationFunctionType, GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type);
-
-    enum NullDisposition {
-        NullAllowed,
-        NullNotAllowed
-    };
-
-    // Helper function to validate that the given ArrayBufferView
-    // is of the correct type and contains enough data for the texImage call.
-    // Generates GL error and returns false if parameters are invalid.
-    bool validateTexFuncData(const char* functionName, GLint level, GLsizei width, GLsizei height, GLenum format, GLenum type, ArrayBufferView* pixels, NullDisposition);
-
-    // Helper function to validate a given texture format is settable as in
-    // you can supply data to texImage2D, or call texImage2D, copyTexImage2D and
-    // copyTexSubImage2D.
-    // Generates GL error and returns false if the format is not settable.
-    bool validateSettableTexFormat(const char* functionName, GLenum format);
-
-    // Helper function to validate compressed texture data is correct size
-    // for the given format and dimensions.
-    bool validateCompressedTexFuncData(const char* functionName, GLsizei width, GLsizei height, GLenum format, ArrayBufferView* pixels);
-
-    // Helper function for validating compressed texture formats.
-    bool validateCompressedTexFormat(GLenum format);
-
-    // Helper function to validate compressed texture dimensions are valid for
-    // the given format.
-    bool validateCompressedTexDimensions(const char* functionName, TexFuncValidationFunctionType, GLenum target, GLint level, GLsizei width, GLsizei height, GLenum format);
-
-    // Helper function to validate compressed texture dimensions are valid for
-    // the given format.
-    bool validateCompressedTexSubDimensions(const char* functionName, GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, WebGLTexture*);
-
-    // Helper function to validate mode for draw{Arrays/Elements}.
-    bool validateDrawMode(const char* functionName, GLenum);
-
-    // Helper function to validate if front/back stencilMask and stencilFunc settings are the same.
-    bool validateStencilSettings(const char* functionName);
-
-    // Helper function to validate stencil or depth func.
-    bool validateStencilOrDepthFunc(const char* functionName, GLenum);
-
-    // Helper function for texParameterf and texParameteri.
-    void texParameter(GLenum target, GLenum pname, GLfloat parami, GLint paramf, bool isFloat);
-
-    // Helper function to print GL errors to console.
-    void printGLErrorToConsole(const String&);
-
-    // Helper function to print warnings to console. Currently
-    // used only to warn about use of obsolete functions.
-    void printWarningToConsole(const String&);
-
-    // Helper function to validate input parameters for framebuffer functions.
-    // Generate GL error if parameters are illegal.
-    bool validateFramebufferFuncParameters(const char* functionName, GLenum target, GLenum attachment);
-
-    // Helper function to validate blend equation mode.
-    bool validateBlendEquation(const char* functionName, GLenum);
-
-    // Helper function to validate blend func factors.
-    bool validateBlendFuncFactors(const char* functionName, GLenum src, GLenum dst);
-
-    // Helper function to validate a GL capability.
-    bool validateCapability(const char* functionName, GLenum);
-
-    // Helper function to validate input parameters for uniform functions.
-    bool validateUniformParameters(const char* functionName, const WebGLUniformLocation*, Float32Array*, GLsizei mod);
-    bool validateUniformParameters(const char* functionName, const WebGLUniformLocation*, Int32Array*, GLsizei mod);
-    bool validateUniformParameters(const char* functionName, const WebGLUniformLocation*, void*, GLsizei, GLsizei mod);
-    bool validateUniformMatrixParameters(const char* functionName, const WebGLUniformLocation*, GLboolean transpose, Float32Array*, GLsizei mod);
-    bool validateUniformMatrixParameters(const char* functionName, const WebGLUniformLocation*, GLboolean transpose, void*, GLsizei, GLsizei mod);
-
-    // Helper function to validate parameters for bufferData.
-    // Return the current bound buffer to target, or 0 if parameters are invalid.
-    WebGLBuffer* validateBufferDataParameters(const char* functionName, GLenum target, GLenum usage);
-
-    // Helper function for tex{Sub}Image2D to make sure image is ready and wouldn't taint Origin.
-    bool validateHTMLImageElement(const char* functionName, HTMLImageElement*, ExceptionState&);
-
-    // Helper function for tex{Sub}Image2D to make sure canvas is ready and wouldn't taint Origin.
-    bool validateHTMLCanvasElement(const char* functionName, HTMLCanvasElement*, ExceptionState&);
-
-    // Helper function for tex{Sub}Image2D to make sure video is ready wouldn't taint Origin.
-    bool validateHTMLVideoElement(const char* functionName, HTMLVideoElement*, ExceptionState&);
-
-    // Helper function to validate drawArrays(Instanced) calls
-    bool validateDrawArrays(const char* functionName, GLenum mode, GLint first, GLsizei count);
-
-    // Helper function to validate drawElements(Instanced) calls
-    bool validateDrawElements(const char* functionName, GLenum mode, GLsizei count, GLenum type, long long offset);
-
-    // Helper function to validate draw*Instanced calls
-    bool validateDrawInstanced(const char* functionName, GLsizei primcount);
-
-    // Helper functions for vertexAttribNf{v}.
-    void vertexAttribfImpl(const char* functionName, GLuint index, GLsizei expectedSize, GLfloat, GLfloat, GLfloat, GLfloat);
-    void vertexAttribfvImpl(const char* functionName, GLuint index, Float32Array*, GLsizei expectedSize);
-    void vertexAttribfvImpl(const char* functionName, GLuint index, GLfloat*, GLsizei, GLsizei expectedSize);
-
-    // Helper function for delete* (deleteBuffer, deleteProgram, etc) functions.
-    // Return false if caller should return without further processing.
-    bool deleteObject(WebGLObject*);
-
-    // Helper function for bind* (bindBuffer, bindTexture, etc) and useProgram.
-    // If the object has already been deleted, set deleted to true upon return.
-    // Return false if caller should return without further processing.
-    bool checkObjectToBeBound(const char* functionName, WebGLObject*, bool& deleted);
-
-    void dispatchContextLostEvent(Timer<WebGLRenderingContext>*);
-    // Helper for restoration after context lost.
-    void maybeRestoreContext(Timer<WebGLRenderingContext>*);
-
-    // Determine if we are running privileged code in the browser, for example,
-    // a Safari or Chrome extension.
-    bool allowPrivilegedExtensions() const;
-
-    // Determine if WEBGL_debug_renderer_info extension is enabled. For the
-    // moment it can be enabled either through a chromium finch experiment
-    // or for privileged code in the browser.
-    bool allowWebGLDebugRendererInfo() const;
-
-    enum ConsoleDisplayPreference {
-        DisplayInConsole,
-        DontDisplayInConsole
-    };
-
-    // Wrapper for WebGraphicsContext3D::synthesizeGLError that sends a message
-    // to the JavaScript console.
-    void synthesizeGLError(GLenum, const char* functionName, const char* description, ConsoleDisplayPreference = DisplayInConsole);
-    void emitGLWarning(const char* function, const char* reason);
-
-    String ensureNotNull(const String&) const;
-
-    // Enable or disable stencil test based on user setting and
-    // whether the current FBO has a stencil buffer.
-    void applyStencilTest();
-
-    // Helper for enabling or disabling a capability.
-    void enableOrDisable(GLenum capability, bool enable);
-
-    // Clamp the width and height to GL_MAX_VIEWPORT_DIMS.
-    IntSize clampedCanvasSize();
-
-    // First time called, if EXT_draw_buffers is supported, query the value; otherwise return 0.
-    // Later, return the cached value.
-    GLint maxDrawBuffers();
-    GLint maxColorAttachments();
-
-    void setBackDrawBuffer(GLenum);
-
-    void restoreCurrentFramebuffer();
-    void restoreCurrentTexture2D();
-
-    virtual void multisamplingChanged(bool) OVERRIDE;
-
-    void findNewMaxEnabledAttribIndex();
-    void findNewMaxNonDefaultTextureUnit();
-
-    friend class WebGLStateRestorer;
-    friend class WebGLRenderingContextEvictionManager;
-
-    static Vector<WebGLRenderingContext*>& activeContexts();
-    static Vector<WebGLRenderingContext*>& forciblyEvictedContexts();
-
-    static void activateContext(WebGLRenderingContext*);
-    static void deactivateContext(WebGLRenderingContext*, bool addToInactiveList);
-    static void willDestroyContext(WebGLRenderingContext*);
-    static void forciblyLoseOldestContext(const String& reason);
-    // Return the least recently used context's position in the active context vector.
-    // If the vector is empty, return the maximum allowed active context number.
-    static size_t oldestContextIndex();
-    static IntSize oldestContextSize();
 };
 
-DEFINE_TYPE_CASTS(WebGLRenderingContext, CanvasRenderingContext, context, context->is3d(), context.is3d());
+DEFINE_TYPE_CASTS(WebGLRenderingContext, CanvasRenderingContext, context,
+    context->is3d() && WebGLRenderingContextBase::getWebGLVersion(context) == 1,
+    context.is3d() && WebGLRenderingContextBase::getWebGLVersion(&context) == 1);
 
 } // namespace WebCore
 
 #endif