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| 1 /* | |
| 2 * Copyright (c) 2010, Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions are | |
| 6 * met: | |
| 7 * | |
| 8 * * Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * * Redistributions in binary form must reproduce the above | |
| 11 * copyright notice, this list of conditions and the following disclaimer | |
| 12 * in the documentation and/or other materials provided with the | |
| 13 * distribution. | |
| 14 * * Neither the name of Google Inc. nor the names of its | |
| 15 * contributors may be used to endorse or promote products derived from | |
| 16 * this software without specific prior written permission. | |
| 17 * | |
| 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 */ | |
| 30 | |
| 31 #ifndef DrawingBuffer_h | |
| 32 #define DrawingBuffer_h | |
| 33 | |
| 34 #include "core/platform/graphics/GraphicsContext3D.h" | |
| 35 #include "platform/geometry/IntSize.h" | |
| 36 #include "platform/graphics/GraphicsTypes3D.h" | |
| 37 | |
| 38 #include "public/platform/WebExternalTextureLayerClient.h" | |
| 39 #include "public/platform/WebExternalTextureMailbox.h" | |
| 40 #include "wtf/Noncopyable.h" | |
| 41 #include "wtf/OwnPtr.h" | |
| 42 #include "wtf/PassOwnPtr.h" | |
| 43 | |
| 44 namespace blink { | |
| 45 class WebExternalBitmap; | |
| 46 class WebExternalTextureLayer; | |
| 47 class WebGraphicsContext3D; | |
| 48 class WebLayer; | |
| 49 } | |
| 50 | |
| 51 namespace WebCore { | |
| 52 class GraphicsContext3D; | |
| 53 class ImageData; | |
| 54 | |
| 55 // Abstract interface to allow basic context eviction management | |
| 56 class ContextEvictionManager : public RefCounted<ContextEvictionManager> { | |
| 57 public: | |
| 58 virtual ~ContextEvictionManager() {}; | |
| 59 | |
| 60 virtual void forciblyLoseOldestContext(const String& reason) = 0; | |
| 61 virtual IntSize oldestContextSize() = 0; | |
| 62 }; | |
| 63 | |
| 64 // Manages a rendering target (framebuffer + attachment) for a canvas. Can publ
ish its rendering | |
| 65 // results to a blink::WebLayer for compositing. | |
| 66 class DrawingBuffer : public RefCounted<DrawingBuffer>, public blink::WebExterna
lTextureLayerClient { | |
| 67 struct MailboxInfo : public RefCounted<MailboxInfo> { | |
| 68 blink::WebExternalTextureMailbox mailbox; | |
| 69 unsigned textureId; | |
| 70 IntSize size; | |
| 71 }; | |
| 72 public: | |
| 73 enum PreserveDrawingBuffer { | |
| 74 Preserve, | |
| 75 Discard | |
| 76 }; | |
| 77 | |
| 78 static PassRefPtr<DrawingBuffer> create(GraphicsContext3D*, const IntSize&,
PreserveDrawingBuffer, PassRefPtr<ContextEvictionManager>); | |
| 79 | |
| 80 ~DrawingBuffer(); | |
| 81 | |
| 82 // Clear all resources from this object, as well as context. Called when con
text is destroyed | |
| 83 // to prevent invalid accesses to the resources. | |
| 84 void releaseResources(); | |
| 85 | |
| 86 // Issues a glClear() on all framebuffers associated with this DrawingBuffer
. The caller is responsible for | |
| 87 // making the context current and setting the clear values and masks. Modifi
es the framebuffer binding. | |
| 88 void clearFramebuffers(GC3Dbitfield clearMask); | |
| 89 | |
| 90 // Given the desired buffer size, provides the largest dimensions that will
fit in the pixel budget. | |
| 91 IntSize adjustSize(const IntSize&); | |
| 92 void reset(const IntSize&); | |
| 93 void bind(); | |
| 94 IntSize size() const { return m_size; } | |
| 95 bool isZeroSized() const { return m_size.isEmpty(); } | |
| 96 | |
| 97 // Copies the multisample color buffer to the normal color buffer and leaves
m_fbo bound. | |
| 98 void commit(long x = 0, long y = 0, long width = -1, long height = -1); | |
| 99 | |
| 100 // commit should copy the full multisample buffer, and not respect the | |
| 101 // current scissor bounds. Track the state of the scissor test so that it | |
| 102 // can be disabled during calls to commit. | |
| 103 void setScissorEnabled(bool scissorEnabled) { m_scissorEnabled = scissorEnab
led; } | |
| 104 | |
| 105 // The DrawingBuffer needs to track the texture bound to texture unit 0. | |
| 106 // The bound texture is tracked to avoid costly queries during rendering. | |
| 107 void setTexture2DBinding(Platform3DObject texture) { m_texture2DBinding = te
xture; } | |
| 108 | |
| 109 // The DrawingBuffer needs to track the currently bound framebuffer so it | |
| 110 // restore the binding when needed. | |
| 111 void setFramebufferBinding(Platform3DObject fbo) { m_framebufferBinding = fb
o; } | |
| 112 | |
| 113 // Track the currently active texture unit. Texture unit 0 is used as host f
or a scratch | |
| 114 // texture. | |
| 115 void setActiveTextureUnit(GC3Dint textureUnit) { m_activeTextureUnit = textu
reUnit; } | |
| 116 | |
| 117 bool multisample() const; | |
| 118 | |
| 119 Platform3DObject framebuffer() const; | |
| 120 | |
| 121 void markContentsChanged(); | |
| 122 | |
| 123 blink::WebLayer* platformLayer(); | |
| 124 void paintCompositedResultsToCanvas(ImageBuffer*); | |
| 125 | |
| 126 // WebExternalTextureLayerClient implementation. | |
| 127 virtual blink::WebGraphicsContext3D* context() OVERRIDE; | |
| 128 virtual bool prepareMailbox(blink::WebExternalTextureMailbox*, blink::WebExt
ernalBitmap*) OVERRIDE; | |
| 129 virtual void mailboxReleased(const blink::WebExternalTextureMailbox&) OVERRI
DE; | |
| 130 | |
| 131 bool copyToPlatformTexture(GraphicsContext3D&, Platform3DObject texture, GC3
Denum internalFormat, | |
| 132 GC3Denum destType, GC3Dint level, bool premultiplyAlpha, bool flipY); | |
| 133 | |
| 134 private: | |
| 135 DrawingBuffer(GraphicsContext3D*, const IntSize&, bool multisampleExtensionS
upported, | |
| 136 bool packedDepthStencilExtensionSupported, PreserveDrawingBuff
er, PassRefPtr<ContextEvictionManager>); | |
| 137 | |
| 138 void initialize(const IntSize&); | |
| 139 | |
| 140 Platform3DObject frontColorBuffer() const; | |
| 141 Platform3DObject colorBuffer() const { return m_colorBuffer; } | |
| 142 | |
| 143 unsigned createColorTexture(const IntSize& size = IntSize()); | |
| 144 // Create the depth/stencil and multisample buffers, if needed. | |
| 145 void createSecondaryBuffers(); | |
| 146 bool resizeFramebuffer(const IntSize&); | |
| 147 bool resizeMultisampleFramebuffer(const IntSize&); | |
| 148 void resizeDepthStencil(const IntSize&, int sampleCount); | |
| 149 | |
| 150 // Bind to the m_framebufferBinding if it's not 0. | |
| 151 void restoreFramebufferBinding(); | |
| 152 | |
| 153 void clearPlatformLayer(); | |
| 154 | |
| 155 PassRefPtr<MailboxInfo> recycledMailbox(); | |
| 156 PassRefPtr<MailboxInfo> createNewMailbox(unsigned); | |
| 157 | |
| 158 // Updates the current size of the buffer, ensuring that s_currentResourceUs
ePixels is updated. | |
| 159 void setSize(const IntSize& size); | |
| 160 | |
| 161 // Calculates the difference in pixels between the current buffer size and t
he proposed size. | |
| 162 int pixelDelta(const IntSize& size); | |
| 163 | |
| 164 // Given the desired buffer size, provides the largest dimensions that will
fit in the pixel budget | |
| 165 // Returns true if the buffer will only fit if the oldest WebGL context is f
orcibly lost | |
| 166 IntSize adjustSizeWithContextEviction(const IntSize&, bool& evictContext); | |
| 167 | |
| 168 PreserveDrawingBuffer m_preserveDrawingBuffer; | |
| 169 bool m_scissorEnabled; | |
| 170 Platform3DObject m_texture2DBinding; | |
| 171 Platform3DObject m_framebufferBinding; | |
| 172 GC3Denum m_activeTextureUnit; | |
| 173 | |
| 174 RefPtr<GraphicsContext3D> m_context; | |
| 175 IntSize m_size; | |
| 176 bool m_multisampleExtensionSupported; | |
| 177 bool m_packedDepthStencilExtensionSupported; | |
| 178 Platform3DObject m_fbo; | |
| 179 Platform3DObject m_colorBuffer; | |
| 180 Platform3DObject m_frontColorBuffer; | |
| 181 | |
| 182 // This is used when we have OES_packed_depth_stencil. | |
| 183 Platform3DObject m_depthStencilBuffer; | |
| 184 | |
| 185 // These are used when we don't. | |
| 186 Platform3DObject m_depthBuffer; | |
| 187 Platform3DObject m_stencilBuffer; | |
| 188 | |
| 189 // For multisampling. | |
| 190 Platform3DObject m_multisampleFBO; | |
| 191 Platform3DObject m_multisampleColorBuffer; | |
| 192 | |
| 193 // True if our contents have been modified since the last presentation of th
is buffer. | |
| 194 bool m_contentsChanged; | |
| 195 | |
| 196 // True if commit() has been called since the last time markContentsChanged(
) had been called. | |
| 197 bool m_contentsChangeCommitted; | |
| 198 | |
| 199 GraphicsContext3D::Attributes m_attributes; | |
| 200 unsigned m_internalColorFormat; | |
| 201 unsigned m_colorFormat; | |
| 202 unsigned m_internalRenderbufferFormat; | |
| 203 int m_maxTextureSize; | |
| 204 | |
| 205 OwnPtr<blink::WebExternalTextureLayer> m_layer; | |
| 206 | |
| 207 // All of the mailboxes that this DrawingBuffer has ever created. | |
| 208 Vector<RefPtr<MailboxInfo> > m_textureMailboxes; | |
| 209 // Mailboxes that were released by the compositor and can be used again by t
his DrawingBuffer. | |
| 210 Vector<RefPtr<MailboxInfo> > m_recycledMailboxes; | |
| 211 RefPtr<MailboxInfo> m_lastColorBuffer; | |
| 212 | |
| 213 RefPtr<ContextEvictionManager> m_contextEvictionManager; | |
| 214 }; | |
| 215 | |
| 216 } // namespace WebCore | |
| 217 | |
| 218 #endif // DrawingBuffer_h | |
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Chromium Code Reviews
Issue 99103006:
Moving GraphicsContext and dependencies from core to platform. (Closed)
Base URL: svn://svn.chromium.org/blink/trunk