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Unified Diff: Source/core/platform/graphics/gpu/DrawingBuffer.cpp

Issue 99103006: Moving GraphicsContext and dependencies from core to platform. (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: Final patch - fixes Android Created 7 years ago
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Index: Source/core/platform/graphics/gpu/DrawingBuffer.cpp
diff --git a/Source/core/platform/graphics/gpu/DrawingBuffer.cpp b/Source/core/platform/graphics/gpu/DrawingBuffer.cpp
deleted file mode 100644
index 1ce2937c2821f36dfac495fe2aced77f37cb41dc..0000000000000000000000000000000000000000
--- a/Source/core/platform/graphics/gpu/DrawingBuffer.cpp
+++ /dev/null
@@ -1,761 +0,0 @@
-/*
- * Copyright (c) 2010, Google 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:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * 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.
- * * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "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 THE COPYRIGHT
- * OWNER 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/platform/graphics/gpu/DrawingBuffer.h"
-
-#include <algorithm>
-#include "core/platform/graphics/Extensions3D.h"
-#include "core/platform/graphics/GraphicsLayer.h"
-#include "platform/TraceEvent.h"
-#include "public/platform/Platform.h"
-#include "public/platform/WebCompositorSupport.h"
-#include "public/platform/WebExternalBitmap.h"
-#include "public/platform/WebExternalTextureLayer.h"
-#include "public/platform/WebGraphicsContext3D.h"
-
-using namespace std;
-
-namespace WebCore {
-
-// Global resource ceiling (expressed in terms of pixels) for DrawingBuffer creation and resize.
-// When this limit is set, DrawingBuffer::create() and DrawingBuffer::reset() calls that would
-// exceed the global cap will instead clear the buffer.
-static const int s_maximumResourceUsePixels = 16 * 1024 * 1024;
-static int s_currentResourceUsePixels = 0;
-static const float s_resourceAdjustedRatio = 0.5;
-
-static const bool s_allowContextEvictionOnCreate = true;
-static const int s_maxScaleAttempts = 3;
-
-class ScopedTextureUnit0BindingRestorer {
-public:
- ScopedTextureUnit0BindingRestorer(GraphicsContext3D* context, GC3Denum activeTextureUnit, Platform3DObject textureUnitZeroId)
- : m_context(context)
- , m_oldActiveTextureUnit(activeTextureUnit)
- , m_oldTextureUnitZeroId(textureUnitZeroId)
- {
- m_context->activeTexture(GraphicsContext3D::TEXTURE0);
- }
- ~ScopedTextureUnit0BindingRestorer()
- {
- m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_oldTextureUnitZeroId);
- m_context->activeTexture(m_oldActiveTextureUnit);
- }
-
-private:
- GraphicsContext3D* m_context;
- GC3Denum m_oldActiveTextureUnit;
- Platform3DObject m_oldTextureUnitZeroId;
-};
-
-PassRefPtr<DrawingBuffer> DrawingBuffer::create(GraphicsContext3D* context, const IntSize& size, PreserveDrawingBuffer preserve, PassRefPtr<ContextEvictionManager> contextEvictionManager)
-{
- Extensions3D* extensions = context->extensions();
- bool multisampleSupported = extensions->supports("GL_ANGLE_framebuffer_blit")
- && extensions->supports("GL_ANGLE_framebuffer_multisample")
- && extensions->supports("GL_OES_rgb8_rgba8");
- if (multisampleSupported) {
- extensions->ensureEnabled("GL_ANGLE_framebuffer_blit");
- extensions->ensureEnabled("GL_ANGLE_framebuffer_multisample");
- extensions->ensureEnabled("GL_OES_rgb8_rgba8");
- }
- bool packedDepthStencilSupported = extensions->supports("GL_OES_packed_depth_stencil");
- if (packedDepthStencilSupported)
- extensions->ensureEnabled("GL_OES_packed_depth_stencil");
-
- RefPtr<DrawingBuffer> drawingBuffer = adoptRef(new DrawingBuffer(context, size, multisampleSupported, packedDepthStencilSupported, preserve, contextEvictionManager));
- return drawingBuffer.release();
-}
-
-DrawingBuffer::DrawingBuffer(GraphicsContext3D* context,
- const IntSize& size,
- bool multisampleExtensionSupported,
- bool packedDepthStencilExtensionSupported,
- PreserveDrawingBuffer preserve,
- PassRefPtr<ContextEvictionManager> contextEvictionManager)
- : m_preserveDrawingBuffer(preserve)
- , m_scissorEnabled(false)
- , m_texture2DBinding(0)
- , m_framebufferBinding(0)
- , m_activeTextureUnit(GraphicsContext3D::TEXTURE0)
- , m_context(context)
- , m_size(-1, -1)
- , m_multisampleExtensionSupported(multisampleExtensionSupported)
- , m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported)
- , m_fbo(0)
- , m_colorBuffer(0)
- , m_frontColorBuffer(0)
- , m_depthStencilBuffer(0)
- , m_depthBuffer(0)
- , m_stencilBuffer(0)
- , m_multisampleFBO(0)
- , m_multisampleColorBuffer(0)
- , m_contentsChanged(true)
- , m_contentsChangeCommitted(false)
- , m_internalColorFormat(0)
- , m_colorFormat(0)
- , m_internalRenderbufferFormat(0)
- , m_maxTextureSize(0)
- , m_contextEvictionManager(contextEvictionManager)
-{
- // Used by browser tests to detect the use of a DrawingBuffer.
- TRACE_EVENT_INSTANT0("test_gpu", "DrawingBufferCreation");
- initialize(size);
-}
-
-DrawingBuffer::~DrawingBuffer()
-{
- releaseResources();
-}
-
-void DrawingBuffer::markContentsChanged()
-{
- m_contentsChanged = true;
- m_contentsChangeCommitted = false;
-}
-
-blink::WebGraphicsContext3D* DrawingBuffer::context()
-{
- if (!m_context)
- return 0;
- return m_context->webContext();
-}
-
-bool DrawingBuffer::prepareMailbox(blink::WebExternalTextureMailbox* outMailbox, blink::WebExternalBitmap* bitmap)
-{
- if (!m_context || !m_contentsChanged || !m_lastColorBuffer)
- return false;
-
- m_context->makeContextCurrent();
-
- // Resolve the multisampled buffer into the texture referenced by m_lastColorBuffer mailbox.
- if (multisample())
- commit();
-
- if (bitmap) {
- bitmap->setSize(size());
-
- unsigned char* pixels = bitmap->pixels();
- bool needPremultiply = m_attributes.alpha && !m_attributes.premultipliedAlpha;
- GraphicsContext3D::AlphaOp op = needPremultiply ? GraphicsContext3D::AlphaDoPremultiply : GraphicsContext3D::AlphaDoNothing;
- if (pixels)
- m_context->readBackFramebuffer(pixels, size().width(), size().height(), GraphicsContext3D::ReadbackSkia, op);
- }
-
- // We must restore the texture binding since creating new textures,
- // consuming and producing mailboxes changes it.
- ScopedTextureUnit0BindingRestorer restorer(m_context.get(), m_activeTextureUnit, m_texture2DBinding);
-
- // First try to recycle an old buffer.
- RefPtr<MailboxInfo> nextFrontColorBuffer = recycledMailbox();
-
- // No buffer available to recycle, create a new one.
- if (!nextFrontColorBuffer) {
- unsigned newColorBuffer = createColorTexture(m_size);
- // Bad things happened, abandon ship.
- if (!newColorBuffer)
- return false;
-
- nextFrontColorBuffer = createNewMailbox(newColorBuffer);
- }
-
- if (m_preserveDrawingBuffer == Discard) {
- m_colorBuffer = nextFrontColorBuffer->textureId;
- swap(nextFrontColorBuffer, m_lastColorBuffer);
- // It appears safe to overwrite the context's framebuffer binding in the Discard case since there will always be a
- // WebGLRenderingContext::clearIfComposited() call made before the next draw call which restores the framebuffer binding.
- // If this stops being true at some point, we should track the current framebuffer binding in the DrawingBuffer and restore
- // it after attaching the new back buffer here.
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
- m_context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, m_colorBuffer, 0);
- } else {
- Extensions3D* extensions = m_context->extensions();
- extensions->copyTextureCHROMIUM(GraphicsContext3D::TEXTURE_2D, m_colorBuffer, nextFrontColorBuffer->textureId, 0, GraphicsContext3D::RGBA, GraphicsContext3D::UNSIGNED_BYTE);
- }
-
- if (multisample() && !m_framebufferBinding)
- bind();
- else
- restoreFramebufferBinding();
-
- m_contentsChanged = false;
-
- context()->bindTexture(GraphicsContext3D::TEXTURE_2D, nextFrontColorBuffer->textureId);
- context()->produceTextureCHROMIUM(GraphicsContext3D::TEXTURE_2D, nextFrontColorBuffer->mailbox.name);
- context()->flush();
- m_context->markLayerComposited();
-
- *outMailbox = nextFrontColorBuffer->mailbox;
- m_frontColorBuffer = nextFrontColorBuffer->textureId;
- return true;
-}
-
-void DrawingBuffer::mailboxReleased(const blink::WebExternalTextureMailbox& mailbox)
-{
- for (size_t i = 0; i < m_textureMailboxes.size(); i++) {
- RefPtr<MailboxInfo> mailboxInfo = m_textureMailboxes[i];
- if (!memcmp(mailboxInfo->mailbox.name, mailbox.name, sizeof(mailbox.name))) {
- mailboxInfo->mailbox.syncPoint = mailbox.syncPoint;
- m_recycledMailboxes.append(mailboxInfo.release());
- return;
- }
- }
- ASSERT_NOT_REACHED();
-}
-
-PassRefPtr<DrawingBuffer::MailboxInfo> DrawingBuffer::recycledMailbox()
-{
- if (!m_context || m_recycledMailboxes.isEmpty())
- return PassRefPtr<MailboxInfo>();
-
- RefPtr<MailboxInfo> mailboxInfo = m_recycledMailboxes.last().release();
- m_recycledMailboxes.removeLast();
-
- if (mailboxInfo->mailbox.syncPoint) {
- context()->waitSyncPoint(mailboxInfo->mailbox.syncPoint);
- mailboxInfo->mailbox.syncPoint = 0;
- }
-
- context()->bindTexture(GraphicsContext3D::TEXTURE_2D, mailboxInfo->textureId);
- context()->consumeTextureCHROMIUM(GraphicsContext3D::TEXTURE_2D, mailboxInfo->mailbox.name);
-
- if (mailboxInfo->size != m_size) {
- m_context->texImage2DResourceSafe(GraphicsContext3D::TEXTURE_2D, 0, m_internalColorFormat, m_size.width(), m_size.height(), 0, m_colorFormat, GraphicsContext3D::UNSIGNED_BYTE);
- mailboxInfo->size = m_size;
- }
-
- return mailboxInfo.release();
-}
-
-PassRefPtr<DrawingBuffer::MailboxInfo> DrawingBuffer::createNewMailbox(unsigned textureId)
-{
- RefPtr<MailboxInfo> returnMailbox = adoptRef(new MailboxInfo());
- context()->genMailboxCHROMIUM(returnMailbox->mailbox.name);
- returnMailbox->textureId = textureId;
- returnMailbox->size = m_size;
- m_textureMailboxes.append(returnMailbox);
- return returnMailbox.release();
-}
-
-void DrawingBuffer::initialize(const IntSize& size)
-{
- ASSERT(m_context);
- m_attributes = m_context->getContextAttributes();
-
- if (m_attributes.alpha) {
- m_internalColorFormat = GraphicsContext3D::RGBA;
- m_colorFormat = GraphicsContext3D::RGBA;
- m_internalRenderbufferFormat = Extensions3D::RGBA8_OES;
- } else {
- m_internalColorFormat = GraphicsContext3D::RGB;
- m_colorFormat = GraphicsContext3D::RGB;
- m_internalRenderbufferFormat = Extensions3D::RGB8_OES;
- }
-
- m_context->getIntegerv(GraphicsContext3D::MAX_TEXTURE_SIZE, &m_maxTextureSize);
-
- m_fbo = m_context->createFramebuffer();
-
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
- m_colorBuffer = createColorTexture();
- m_context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, m_colorBuffer, 0);
- createSecondaryBuffers();
- reset(size);
- m_lastColorBuffer = createNewMailbox(m_colorBuffer);
-}
-
-unsigned DrawingBuffer::frontColorBuffer() const
-{
- return m_frontColorBuffer;
-}
-
-bool DrawingBuffer::copyToPlatformTexture(GraphicsContext3D& context, Platform3DObject texture, GC3Denum internalFormat, GC3Denum destType, GC3Dint level, bool premultiplyAlpha, bool flipY)
-{
- if (!m_context || !m_context->makeContextCurrent())
- return false;
- if (m_contentsChanged) {
- if (multisample()) {
- commit();
- if (!m_framebufferBinding)
- bind();
- else
- restoreFramebufferBinding();
- }
- m_context->flush();
- }
- Platform3DObject sourceTexture = colorBuffer();
-
- if (!context.makeContextCurrent())
- return false;
- Extensions3D* extensions = context.extensions();
- if (!extensions->supports("GL_CHROMIUM_copy_texture") || !extensions->supports("GL_CHROMIUM_flipy")
- || !extensions->canUseCopyTextureCHROMIUM(internalFormat, destType, level))
- return false;
-
- bool unpackPremultiplyAlphaNeeded = false;
- bool unpackUnpremultiplyAlphaNeeded = false;
- if (m_attributes.alpha && m_attributes.premultipliedAlpha && !premultiplyAlpha)
- unpackUnpremultiplyAlphaNeeded = true;
- else if (m_attributes.alpha && !m_attributes.premultipliedAlpha && premultiplyAlpha)
- unpackPremultiplyAlphaNeeded = true;
-
- context.pixelStorei(Extensions3D::UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, unpackUnpremultiplyAlphaNeeded);
- context.pixelStorei(Extensions3D::UNPACK_PREMULTIPLY_ALPHA_CHROMIUM, unpackPremultiplyAlphaNeeded);
- context.pixelStorei(Extensions3D::UNPACK_FLIP_Y_CHROMIUM, flipY);
- extensions->copyTextureCHROMIUM(GraphicsContext3D::TEXTURE_2D, sourceTexture, texture, level, internalFormat, destType);
- context.pixelStorei(Extensions3D::UNPACK_FLIP_Y_CHROMIUM, false);
- context.pixelStorei(Extensions3D::UNPACK_UNPREMULTIPLY_ALPHA_CHROMIUM, false);
- context.pixelStorei(Extensions3D::UNPACK_PREMULTIPLY_ALPHA_CHROMIUM, false);
-
- return true;
-}
-
-Platform3DObject DrawingBuffer::framebuffer() const
-{
- return m_fbo;
-}
-
-blink::WebLayer* DrawingBuffer::platformLayer()
-{
- if (!m_context)
- return 0;
-
- if (!m_layer) {
- m_layer = adoptPtr(blink::Platform::current()->compositorSupport()->createExternalTextureLayer(this));
-
- m_layer->setOpaque(!m_attributes.alpha);
- m_layer->setBlendBackgroundColor(m_attributes.alpha);
- m_layer->setPremultipliedAlpha(m_attributes.premultipliedAlpha);
- GraphicsLayer::registerContentsLayer(m_layer->layer());
- }
-
- return m_layer->layer();
-}
-
-void DrawingBuffer::paintCompositedResultsToCanvas(ImageBuffer* imageBuffer)
-{
- if (!m_context || !m_context->makeContextCurrent() || m_context->extensions()->getGraphicsResetStatusARB() != GraphicsContext3D::NO_ERROR)
- return;
-
- Extensions3D* extensions = m_context->extensions();
-
- if (!imageBuffer)
- return;
- Platform3DObject tex = imageBuffer->getBackingTexture();
- if (tex) {
- extensions->copyTextureCHROMIUM(GraphicsContext3D::TEXTURE_2D, m_frontColorBuffer,
- tex, 0, GraphicsContext3D::RGBA, GraphicsContext3D::UNSIGNED_BYTE);
- return;
- }
-
- // Since the m_frontColorBuffer was produced and sent to the compositor, it cannot be bound to an fbo.
- // We have to make a copy of it here and bind that copy instead.
- // FIXME: That's not true any more, provided we don't change texture
- // parameters.
- unsigned sourceTexture = createColorTexture(m_size);
- extensions->copyTextureCHROMIUM(GraphicsContext3D::TEXTURE_2D, m_frontColorBuffer, sourceTexture, 0, GraphicsContext3D::RGBA, GraphicsContext3D::UNSIGNED_BYTE);
-
- // Since we're using the same context as WebGL, we have to restore any state we change (in this case, just the framebuffer binding).
- // FIXME: The WebGLRenderingContext tracks the current framebuffer binding, it would be slightly more efficient to use this value
- // rather than querying it off of the context.
- GC3Dint previousFramebuffer = 0;
- m_context->getIntegerv(GraphicsContext3D::FRAMEBUFFER_BINDING, &previousFramebuffer);
-
- Platform3DObject framebuffer = m_context->createFramebuffer();
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, framebuffer);
- m_context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, sourceTexture, 0);
-
- extensions->paintFramebufferToCanvas(framebuffer, size().width(), size().height(), !m_attributes.premultipliedAlpha, imageBuffer);
- m_context->deleteFramebuffer(framebuffer);
- m_context->deleteTexture(sourceTexture);
-
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, previousFramebuffer);
-}
-
-void DrawingBuffer::clearPlatformLayer()
-{
- if (m_layer)
- m_layer->clearTexture();
-
- if (m_context)
- m_context->flush();
-}
-
-void DrawingBuffer::releaseResources()
-{
- if (m_context) {
- m_context->makeContextCurrent();
-
- clearPlatformLayer();
-
- for (size_t i = 0; i < m_textureMailboxes.size(); i++)
- m_context->deleteTexture(m_textureMailboxes[i]->textureId);
-
- if (m_multisampleColorBuffer)
- m_context->deleteRenderbuffer(m_multisampleColorBuffer);
-
- if (m_depthStencilBuffer)
- m_context->deleteRenderbuffer(m_depthStencilBuffer);
-
- if (m_depthBuffer)
- m_context->deleteRenderbuffer(m_depthBuffer);
-
- if (m_stencilBuffer)
- m_context->deleteRenderbuffer(m_stencilBuffer);
-
- if (m_multisampleFBO)
- m_context->deleteFramebuffer(m_multisampleFBO);
-
- if (m_fbo)
- m_context->deleteFramebuffer(m_fbo);
-
- m_context.clear();
- }
-
- setSize(IntSize());
-
- m_colorBuffer = 0;
- m_frontColorBuffer = 0;
- m_multisampleColorBuffer = 0;
- m_depthStencilBuffer = 0;
- m_depthBuffer = 0;
- m_stencilBuffer = 0;
- m_multisampleFBO = 0;
- m_fbo = 0;
- m_contextEvictionManager.clear();
-
- m_lastColorBuffer.clear();
- m_recycledMailboxes.clear();
- m_textureMailboxes.clear();
-
- if (m_layer) {
- GraphicsLayer::unregisterContentsLayer(m_layer->layer());
- m_layer.clear();
- }
-}
-
-unsigned DrawingBuffer::createColorTexture(const IntSize& size)
-{
- if (!m_context)
- return 0;
-
- unsigned offscreenColorTexture = m_context->createTexture();
- if (!offscreenColorTexture)
- return 0;
-
- m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, offscreenColorTexture);
- m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR);
- m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR);
- m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE);
- m_context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE);
- if (!size.isEmpty())
- m_context->texImage2DResourceSafe(GraphicsContext3D::TEXTURE_2D, 0, m_internalColorFormat, size.width(), size.height(), 0, m_colorFormat, GraphicsContext3D::UNSIGNED_BYTE);
-
- return offscreenColorTexture;
-}
-
-void DrawingBuffer::createSecondaryBuffers()
-{
- // create a multisample FBO
- if (multisample()) {
- m_multisampleFBO = m_context->createFramebuffer();
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_multisampleFBO);
- m_multisampleColorBuffer = m_context->createRenderbuffer();
- }
-}
-
-bool DrawingBuffer::resizeFramebuffer(const IntSize& size)
-{
- // resize regular FBO
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
-
- m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer);
- m_context->texImage2DResourceSafe(GraphicsContext3D::TEXTURE_2D, 0, m_internalColorFormat, size.width(), size.height(), 0, m_colorFormat, GraphicsContext3D::UNSIGNED_BYTE);
- if (m_lastColorBuffer)
- m_lastColorBuffer->size = m_size;
-
- m_context->framebufferTexture2D(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::TEXTURE_2D, m_colorBuffer, 0);
-
- m_context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0);
-
- if (!multisample())
- resizeDepthStencil(size, 0);
- if (m_context->checkFramebufferStatus(GraphicsContext3D::FRAMEBUFFER) != GraphicsContext3D::FRAMEBUFFER_COMPLETE)
- return false;
-
- return true;
-}
-
-bool DrawingBuffer::resizeMultisampleFramebuffer(const IntSize& size)
-{
- if (multisample()) {
- int maxSampleCount = 0;
-
- m_context->getIntegerv(Extensions3D::MAX_SAMPLES, &maxSampleCount);
- int sampleCount = std::min(4, maxSampleCount);
-
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_multisampleFBO);
-
- m_context->bindRenderbuffer(GraphicsContext3D::RENDERBUFFER, m_multisampleColorBuffer);
- m_context->extensions()->renderbufferStorageMultisample(GraphicsContext3D::RENDERBUFFER, sampleCount, m_internalRenderbufferFormat, size.width(), size.height());
-
- if (m_context->getError() == GraphicsContext3D::OUT_OF_MEMORY)
- return false;
-
- m_context->framebufferRenderbuffer(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::COLOR_ATTACHMENT0, GraphicsContext3D::RENDERBUFFER, m_multisampleColorBuffer);
- resizeDepthStencil(size, sampleCount);
- if (m_context->checkFramebufferStatus(GraphicsContext3D::FRAMEBUFFER) != GraphicsContext3D::FRAMEBUFFER_COMPLETE)
- return false;
- }
-
- return true;
-}
-
-void DrawingBuffer::resizeDepthStencil(const IntSize& size, int sampleCount)
-{
- if (m_attributes.depth && m_attributes.stencil && m_packedDepthStencilExtensionSupported) {
- if (!m_depthStencilBuffer)
- m_depthStencilBuffer = m_context->createRenderbuffer();
- m_context->bindRenderbuffer(GraphicsContext3D::RENDERBUFFER, m_depthStencilBuffer);
- if (multisample())
- m_context->extensions()->renderbufferStorageMultisample(GraphicsContext3D::RENDERBUFFER, sampleCount, Extensions3D::DEPTH24_STENCIL8, size.width(), size.height());
- else
- m_context->renderbufferStorage(GraphicsContext3D::RENDERBUFFER, Extensions3D::DEPTH24_STENCIL8, size.width(), size.height());
- m_context->framebufferRenderbuffer(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::STENCIL_ATTACHMENT, GraphicsContext3D::RENDERBUFFER, m_depthStencilBuffer);
- m_context->framebufferRenderbuffer(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::DEPTH_ATTACHMENT, GraphicsContext3D::RENDERBUFFER, m_depthStencilBuffer);
- } else {
- if (m_attributes.depth) {
- if (!m_depthBuffer)
- m_depthBuffer = m_context->createRenderbuffer();
- m_context->bindRenderbuffer(GraphicsContext3D::RENDERBUFFER, m_depthBuffer);
- if (multisample())
- m_context->extensions()->renderbufferStorageMultisample(GraphicsContext3D::RENDERBUFFER, sampleCount, GraphicsContext3D::DEPTH_COMPONENT16, size.width(), size.height());
- else
- m_context->renderbufferStorage(GraphicsContext3D::RENDERBUFFER, GraphicsContext3D::DEPTH_COMPONENT16, size.width(), size.height());
- m_context->framebufferRenderbuffer(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::DEPTH_ATTACHMENT, GraphicsContext3D::RENDERBUFFER, m_depthBuffer);
- }
- if (m_attributes.stencil) {
- if (!m_stencilBuffer)
- m_stencilBuffer = m_context->createRenderbuffer();
- m_context->bindRenderbuffer(GraphicsContext3D::RENDERBUFFER, m_stencilBuffer);
- if (multisample())
- m_context->extensions()->renderbufferStorageMultisample(GraphicsContext3D::RENDERBUFFER, sampleCount, GraphicsContext3D::STENCIL_INDEX8, size.width(), size.height());
- else
- m_context->renderbufferStorage(GraphicsContext3D::RENDERBUFFER, GraphicsContext3D::STENCIL_INDEX8, size.width(), size.height());
- m_context->framebufferRenderbuffer(GraphicsContext3D::FRAMEBUFFER, GraphicsContext3D::STENCIL_ATTACHMENT, GraphicsContext3D::RENDERBUFFER, m_stencilBuffer);
- }
- }
- m_context->bindRenderbuffer(GraphicsContext3D::RENDERBUFFER, 0);
-}
-
-
-
-void DrawingBuffer::clearFramebuffers(GC3Dbitfield clearMask)
-{
- if (!m_context)
- return;
-
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_multisampleFBO ? m_multisampleFBO : m_fbo);
-
- m_context->clear(clearMask);
-
- // The multisample fbo was just cleared, but we also need to clear the non-multisampled buffer too.
- if (m_multisampleFBO) {
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
- m_context->clear(GraphicsContext3D::COLOR_BUFFER_BIT);
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_multisampleFBO);
- }
-}
-
-void DrawingBuffer::setSize(const IntSize& size) {
- if (m_size == size)
- return;
-
- s_currentResourceUsePixels += pixelDelta(size);
- m_size = size;
-}
-
-int DrawingBuffer::pixelDelta(const IntSize& size) {
- return (max(0, size.width()) * max(0, size.height())) - (max(0, m_size.width()) * max(0, m_size.height()));
-}
-
-IntSize DrawingBuffer::adjustSize(const IntSize& size) {
- IntSize adjustedSize = size;
-
- // Clamp if the desired size is greater than the maximum texture size for the device.
- if (adjustedSize.height() > m_maxTextureSize)
- adjustedSize.setHeight(m_maxTextureSize);
-
- if (adjustedSize.width() > m_maxTextureSize)
- adjustedSize.setWidth(m_maxTextureSize);
-
- // Try progressively smaller sizes until we find a size that fits or reach a scale limit.
- int scaleAttempts = 0;
- while ((s_currentResourceUsePixels + pixelDelta(adjustedSize)) > s_maximumResourceUsePixels) {
- scaleAttempts++;
- if (scaleAttempts > s_maxScaleAttempts)
- return IntSize();
-
- adjustedSize.scale(s_resourceAdjustedRatio);
-
- if (adjustedSize.isEmpty())
- return IntSize();
- }
-
- return adjustedSize;
-}
-
-IntSize DrawingBuffer::adjustSizeWithContextEviction(const IntSize& size, bool& evictContext) {
- IntSize adjustedSize = adjustSize(size);
- if (!adjustedSize.isEmpty()) {
- evictContext = false;
- return adjustedSize; // Buffer fits without evicting a context.
- }
-
- // Speculatively adjust the pixel budget to see if the buffer would fit should the oldest context be evicted.
- IntSize oldestSize = m_contextEvictionManager->oldestContextSize();
- int pixelDelta = oldestSize.width() * oldestSize.height();
-
- s_currentResourceUsePixels -= pixelDelta;
- adjustedSize = adjustSize(size);
- s_currentResourceUsePixels += pixelDelta;
-
- evictContext = !adjustedSize.isEmpty();
- return adjustedSize;
-}
-
-void DrawingBuffer::reset(const IntSize& newSize)
-{
- if (!m_context)
- return;
-
- IntSize adjustedSize;
- bool evictContext = false;
- bool isNewContext = m_size.isEmpty();
- if (s_allowContextEvictionOnCreate && isNewContext)
- adjustedSize = adjustSizeWithContextEviction(newSize, evictContext);
- else
- adjustedSize = adjustSize(newSize);
-
- if (adjustedSize.isEmpty())
- return;
-
- if (evictContext)
- m_contextEvictionManager->forciblyLoseOldestContext("WARNING: WebGL contexts have exceeded the maximum allowed backbuffer area. Oldest context will be lost.");
-
- if (adjustedSize != m_size) {
- do {
- // resize multisample FBO
- if (!resizeMultisampleFramebuffer(adjustedSize) || !resizeFramebuffer(adjustedSize)) {
- adjustedSize.scale(s_resourceAdjustedRatio);
- continue;
- }
- break;
- } while (!adjustedSize.isEmpty());
-
- setSize(adjustedSize);
-
- if (adjustedSize.isEmpty())
- return;
- }
-
- m_context->disable(GraphicsContext3D::SCISSOR_TEST);
- m_context->clearColor(0, 0, 0, 0);
- m_context->colorMask(true, true, true, true);
-
- GC3Dbitfield clearMask = GraphicsContext3D::COLOR_BUFFER_BIT;
- if (m_attributes.depth) {
- m_context->clearDepth(1.0f);
- clearMask |= GraphicsContext3D::DEPTH_BUFFER_BIT;
- m_context->depthMask(true);
- }
- if (m_attributes.stencil) {
- m_context->clearStencil(0);
- clearMask |= GraphicsContext3D::STENCIL_BUFFER_BIT;
- m_context->stencilMaskSeparate(GraphicsContext3D::FRONT, 0xFFFFFFFF);
- }
-
- clearFramebuffers(clearMask);
-}
-
-void DrawingBuffer::commit(long x, long y, long width, long height)
-{
- if (!m_context)
- return;
-
- if (width < 0)
- width = m_size.width();
- if (height < 0)
- height = m_size.height();
-
- m_context->makeContextCurrent();
-
- if (m_multisampleFBO && !m_contentsChangeCommitted) {
- m_context->bindFramebuffer(Extensions3D::READ_FRAMEBUFFER, m_multisampleFBO);
- m_context->bindFramebuffer(Extensions3D::DRAW_FRAMEBUFFER, m_fbo);
-
- if (m_scissorEnabled)
- m_context->disable(GraphicsContext3D::SCISSOR_TEST);
-
- // Use NEAREST, because there is no scale performed during the blit.
- m_context->extensions()->blitFramebuffer(x, y, width, height, x, y, width, height, GraphicsContext3D::COLOR_BUFFER_BIT, GraphicsContext3D::NEAREST);
-
- if (m_scissorEnabled)
- m_context->enable(GraphicsContext3D::SCISSOR_TEST);
- }
-
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_fbo);
- m_contentsChangeCommitted = true;
-}
-
-void DrawingBuffer::restoreFramebufferBinding()
-{
- if (!m_context || !m_framebufferBinding)
- return;
-
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_framebufferBinding);
-}
-
-bool DrawingBuffer::multisample() const
-{
- return m_attributes.antialias && m_multisampleExtensionSupported;
-}
-
-void DrawingBuffer::bind()
-{
- if (!m_context)
- return;
-
- m_context->bindFramebuffer(GraphicsContext3D::FRAMEBUFFER, m_multisampleFBO ? m_multisampleFBO : m_fbo);
-}
-
-} // namespace WebCore
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