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      1 /*
      2  * Copyright (C) 2012 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 WebGraphicsContext3D_h
     32 #define WebGraphicsContext3D_h
     33 
     34 #include "WebCommon.h"
     35 #include "WebNonCopyable.h"
     36 #include "WebString.h"
     37 
     38 struct GrGLInterface;
     39 
     40 namespace blink {
     41 
     42 // WGC3D types match the corresponding GL types as defined in OpenGL ES 2.0
     43 // header file gl2.h from khronos.org.
     44 typedef char WGC3Dchar;
     45 typedef unsigned WGC3Denum;
     46 typedef unsigned char WGC3Dboolean;
     47 typedef unsigned WGC3Dbitfield;
     48 typedef signed char WGC3Dbyte;
     49 typedef unsigned char WGC3Dubyte;
     50 typedef short WGC3Dshort;
     51 typedef unsigned short WGC3Dushort;
     52 typedef int WGC3Dint;
     53 typedef int WGC3Dsizei;
     54 typedef unsigned WGC3Duint;
     55 typedef float WGC3Dfloat;
     56 typedef float WGC3Dclampf;
     57 typedef signed long int WGC3Dintptr;
     58 typedef signed long int WGC3Dsizeiptr;
     59 
     60 // Typedef for server-side objects like OpenGL textures and program objects.
     61 typedef WGC3Duint WebGLId;
     62 
     63 // This interface abstracts the operations performed by the
     64 // GraphicsContext3D in order to implement WebGL. Nearly all of the
     65 // methods exposed on this interface map directly to entry points in
     66 // the OpenGL ES 2.0 API.
     67 class WebGraphicsContext3D : public WebNonCopyable {
     68 public:
     69     // Return value from getActiveUniform and getActiveAttrib.
     70     struct ActiveInfo {
     71         WebString name;
     72         WGC3Denum type;
     73         WGC3Dint size;
     74     };
     75 
     76     // Context creation attributes.
     77     struct Attributes {
     78         Attributes()
     79             : alpha(true)
     80             , depth(true)
     81             , stencil(true)
     82             , antialias(true)
     83             , premultipliedAlpha(true)
     84             , canRecoverFromContextLoss(true)
     85             , noExtensions(false)
     86             , shareResources(true)
     87             , preferDiscreteGPU(false)
     88             , noAutomaticFlushes(false)
     89             , failIfMajorPerformanceCaveat(false)
     90             , webGL(false)
     91             , webGLVersion(0)
     92         {
     93         }
     94 
     95         bool alpha;
     96         bool depth;
     97         bool stencil;
     98         bool antialias;
     99         bool premultipliedAlpha;
    100         bool canRecoverFromContextLoss;
    101         bool noExtensions;
    102         bool shareResources;
    103         bool preferDiscreteGPU;
    104         bool noAutomaticFlushes;
    105         bool failIfMajorPerformanceCaveat;
    106         bool webGL;
    107         unsigned webGLVersion;
    108         // FIXME: ideally this would be a WebURL, but it is currently not
    109         // possible to pass a WebURL by value across the WebKit API boundary.
    110         // See https://bugs.webkit.org/show_bug.cgi?id=103793#c13 .
    111         WebString topDocumentURL;
    112     };
    113 
    114     class WebGraphicsContextLostCallback {
    115     public:
    116         virtual void onContextLost() = 0;
    117 
    118     protected:
    119         virtual ~WebGraphicsContextLostCallback() { }
    120     };
    121 
    122     class WebGraphicsErrorMessageCallback {
    123     public:
    124         virtual void onErrorMessage(const WebString&, WGC3Dint) = 0;
    125 
    126     protected:
    127         virtual ~WebGraphicsErrorMessageCallback() { }
    128     };
    129 
    130     class WebGraphicsSwapBuffersCompleteCallbackCHROMIUM {
    131     public:
    132         virtual void onSwapBuffersComplete() = 0;
    133 
    134     protected:
    135         virtual ~WebGraphicsSwapBuffersCompleteCallbackCHROMIUM() { }
    136     };
    137 
    138     // This destructor needs to be public so that using classes can destroy instances if initialization fails.
    139     virtual ~WebGraphicsContext3D() { }
    140 
    141     // Each flush or finish is assigned an unique ID. The larger
    142     // the ID number, the more recently the context has been flushed.
    143     virtual uint32_t lastFlushID() { return 0; }
    144 
    145     // Resizes the region into which this WebGraphicsContext3D is drawing.
    146     virtual void reshapeWithScaleFactor(int width, int height, float scaleFactor) { }
    147 
    148     // GL_CHROMIUM_setVisibility - Changes the visibility of the backbuffer
    149     virtual void setVisibilityCHROMIUM(bool visible) = 0;
    150 
    151     // GL_EXT_discard_framebuffer - makes specified attachments of currently bound framebuffer undefined.
    152     virtual void discardFramebufferEXT(WGC3Denum target, WGC3Dsizei numAttachments, const WGC3Denum* attachments) { }
    153 
    154     // GL_CHROMIUM_discard_backbuffer - controls allocation/deallocation of the back buffer.
    155     virtual void discardBackbufferCHROMIUM() { }
    156     virtual void ensureBackbufferCHROMIUM() { }
    157 
    158     virtual unsigned insertSyncPoint() { return 0; }
    159     virtual void waitSyncPoint(unsigned) { }
    160 
    161     // Copies the contents of the off-screen render target used by the WebGL
    162     // context to the corresponding texture used by the compositor.
    163     virtual void prepareTexture() = 0;
    164 
    165     // GL_CHROMIUM_post_sub_buffer - Copies part of the back buffer to the front buffer.
    166     virtual void postSubBufferCHROMIUM(int x, int y, int width, int height) = 0;
    167 
    168     // Synthesizes an OpenGL error which will be returned from a
    169     // later call to getError. This is used to emulate OpenGL ES
    170     // 2.0 behavior on the desktop and to enforce additional error
    171     // checking mandated by WebGL.
    172     //
    173     // Per the behavior of glGetError, this stores at most one
    174     // instance of any given error, and returns them from calls to
    175     // getError in the order they were added.
    176     virtual void synthesizeGLError(WGC3Denum) = 0;
    177 
    178     virtual bool isContextLost() = 0;
    179 
    180     // GL_CHROMIUM_map_sub
    181     virtual void* mapBufferSubDataCHROMIUM(WGC3Denum target, WGC3Dintptr offset, WGC3Dsizeiptr size, WGC3Denum access) = 0;
    182     virtual void unmapBufferSubDataCHROMIUM(const void*) = 0;
    183     virtual void* mapTexSubImage2DCHROMIUM(WGC3Denum target, WGC3Dint level, WGC3Dint xoffset, WGC3Dint yoffset, WGC3Dsizei width, WGC3Dsizei height, WGC3Denum format, WGC3Denum type, WGC3Denum access) = 0;
    184     virtual void unmapTexSubImage2DCHROMIUM(const void*) = 0;
    185 
    186     // GL_CHROMIUM_request_extension
    187     virtual WebString getRequestableExtensionsCHROMIUM() = 0;
    188     virtual void requestExtensionCHROMIUM(const char*) = 0;
    189 
    190     // GL_CHROMIUM_framebuffer_multisample
    191     virtual void blitFramebufferCHROMIUM(WGC3Dint srcX0, WGC3Dint srcY0, WGC3Dint srcX1, WGC3Dint srcY1, WGC3Dint dstX0, WGC3Dint dstY0, WGC3Dint dstX1, WGC3Dint dstY1, WGC3Dbitfield mask, WGC3Denum filter) = 0;
    192     virtual void renderbufferStorageMultisampleCHROMIUM(WGC3Denum target, WGC3Dsizei samples, WGC3Denum internalformat, WGC3Dsizei width, WGC3Dsizei height) = 0;
    193 
    194     // GL_CHROMIUM_swapbuffers_complete_callback
    195     virtual void setSwapBuffersCompleteCallbackCHROMIUM(WebGraphicsSwapBuffersCompleteCallbackCHROMIUM* callback) { }
    196 
    197     // GL_CHROMIUM_rate_limit_offscreen_context
    198     virtual void rateLimitOffscreenContextCHROMIUM() { }
    199 
    200     // GL_CHROMIUM_lose_context
    201     virtual void loseContextCHROMIUM(WGC3Denum current, WGC3Denum other) { }
    202 
    203     // The entry points below map directly to the OpenGL ES 2.0 API.
    204     // See: http://www.khronos.org/registry/gles/
    205     // and: http://www.khronos.org/opengles/sdk/docs/man/
    206     virtual void activeTexture(WGC3Denum texture) = 0;
    207     virtual void attachShader(WebGLId program, WebGLId shader) = 0;
    208     virtual void bindAttribLocation(WebGLId program, WGC3Duint index, const WGC3Dchar* name) = 0;
    209     virtual void bindBuffer(WGC3Denum target, WebGLId buffer) = 0;
    210     virtual void bindFramebuffer(WGC3Denum target, WebGLId framebuffer) = 0;
    211     virtual void bindRenderbuffer(WGC3Denum target, WebGLId renderbuffer) = 0;
    212     virtual void bindTexture(WGC3Denum target, WebGLId texture) = 0;
    213     virtual void blendColor(WGC3Dclampf red, WGC3Dclampf green, WGC3Dclampf blue, WGC3Dclampf alpha) = 0;
    214     virtual void blendEquation(WGC3Denum mode) = 0;
    215     virtual void blendEquationSeparate(WGC3Denum modeRGB, WGC3Denum modeAlpha) = 0;
    216     virtual void blendFunc(WGC3Denum sfactor, WGC3Denum dfactor) = 0;
    217     virtual void blendFuncSeparate(WGC3Denum srcRGB, WGC3Denum dstRGB, WGC3Denum srcAlpha, WGC3Denum dstAlpha) = 0;
    218 
    219     virtual void bufferData(WGC3Denum target, WGC3Dsizeiptr size, const void* data, WGC3Denum usage) = 0;
    220     virtual void bufferSubData(WGC3Denum target, WGC3Dintptr offset, WGC3Dsizeiptr size, const void* data) = 0;
    221 
    222     virtual WGC3Denum checkFramebufferStatus(WGC3Denum target) = 0;
    223     virtual void clear(WGC3Dbitfield mask) = 0;
    224     virtual void clearColor(WGC3Dclampf red, WGC3Dclampf green, WGC3Dclampf blue, WGC3Dclampf alpha) = 0;
    225     virtual void clearDepth(WGC3Dclampf depth) = 0;
    226     virtual void clearStencil(WGC3Dint s) = 0;
    227     virtual void colorMask(WGC3Dboolean red, WGC3Dboolean green, WGC3Dboolean blue, WGC3Dboolean alpha) = 0;
    228     virtual void compileShader(WebGLId shader) = 0;
    229 
    230     virtual void compressedTexImage2D(WGC3Denum target, WGC3Dint level, WGC3Denum internalformat, WGC3Dsizei width, WGC3Dsizei height, WGC3Dint border, WGC3Dsizei imageSize, const void* data) = 0;
    231     virtual void compressedTexSubImage2D(WGC3Denum target, WGC3Dint level, WGC3Dint xoffset, WGC3Dint yoffset, WGC3Dsizei width, WGC3Dsizei height, WGC3Denum format, WGC3Dsizei imageSize, const void* data) = 0;
    232     virtual void copyTexImage2D(WGC3Denum target, WGC3Dint level, WGC3Denum internalformat, WGC3Dint x, WGC3Dint y, WGC3Dsizei width, WGC3Dsizei height, WGC3Dint border) = 0;
    233     virtual void copyTexSubImage2D(WGC3Denum target, WGC3Dint level, WGC3Dint xoffset, WGC3Dint yoffset, WGC3Dint x, WGC3Dint y, WGC3Dsizei width, WGC3Dsizei height) = 0;
    234     virtual void cullFace(WGC3Denum mode) = 0;
    235     virtual void depthFunc(WGC3Denum func) = 0;
    236     virtual void depthMask(WGC3Dboolean flag) = 0;
    237     virtual void depthRange(WGC3Dclampf zNear, WGC3Dclampf zFar) = 0;
    238     virtual void detachShader(WebGLId program, WebGLId shader) = 0;
    239     virtual void disable(WGC3Denum cap) = 0;
    240     virtual void disableVertexAttribArray(WGC3Duint index) = 0;
    241     virtual void drawArrays(WGC3Denum mode, WGC3Dint first, WGC3Dsizei count) = 0;
    242     virtual void drawElements(WGC3Denum mode, WGC3Dsizei count, WGC3Denum type, WGC3Dintptr offset) = 0;
    243 
    244     virtual void enable(WGC3Denum cap) = 0;
    245     virtual void enableVertexAttribArray(WGC3Duint index) = 0;
    246     virtual void finish() = 0;
    247     virtual void flush() = 0;
    248     virtual void framebufferRenderbuffer(WGC3Denum target, WGC3Denum attachment, WGC3Denum renderbuffertarget, WebGLId renderbuffer) = 0;
    249     virtual void framebufferTexture2D(WGC3Denum target, WGC3Denum attachment, WGC3Denum textarget, WebGLId texture, WGC3Dint level) = 0;
    250     virtual void frontFace(WGC3Denum mode) = 0;
    251     virtual void generateMipmap(WGC3Denum target) = 0;
    252 
    253     virtual bool getActiveAttrib(WebGLId program, WGC3Duint index, ActiveInfo&) = 0;
    254     virtual bool getActiveUniform(WebGLId program, WGC3Duint index, ActiveInfo&) = 0;
    255     virtual void getAttachedShaders(WebGLId program, WGC3Dsizei maxCount, WGC3Dsizei* count, WebGLId* shaders) = 0;
    256     virtual WGC3Dint getAttribLocation(WebGLId program, const WGC3Dchar* name) = 0;
    257     virtual void getBooleanv(WGC3Denum pname, WGC3Dboolean* value) = 0;
    258     virtual void getBufferParameteriv(WGC3Denum target, WGC3Denum pname, WGC3Dint* value) = 0;
    259     virtual WGC3Denum getError() = 0;
    260     virtual void getFloatv(WGC3Denum pname, WGC3Dfloat* value) = 0;
    261     virtual void getFramebufferAttachmentParameteriv(WGC3Denum target, WGC3Denum attachment, WGC3Denum pname, WGC3Dint* value) = 0;
    262     virtual void getIntegerv(WGC3Denum pname, WGC3Dint* value) = 0;
    263     virtual void getProgramiv(WebGLId program, WGC3Denum pname, WGC3Dint* value) = 0;
    264     virtual WebString getProgramInfoLog(WebGLId program) = 0;
    265     virtual void getRenderbufferParameteriv(WGC3Denum target, WGC3Denum pname, WGC3Dint* value) = 0;
    266     virtual void getShaderiv(WebGLId shader, WGC3Denum pname, WGC3Dint* value) = 0;
    267     virtual WebString getShaderInfoLog(WebGLId shader) = 0;
    268     virtual void getShaderPrecisionFormat(WGC3Denum shadertype, WGC3Denum precisiontype, WGC3Dint* range, WGC3Dint* precision) = 0;
    269     virtual WebString getShaderSource(WebGLId shader) = 0;
    270     virtual WebString getString(WGC3Denum name) = 0;
    271     virtual void getTexParameterfv(WGC3Denum target, WGC3Denum pname, WGC3Dfloat* value) = 0;
    272     virtual void getTexParameteriv(WGC3Denum target, WGC3Denum pname, WGC3Dint* value) = 0;
    273     virtual void getUniformfv(WebGLId program, WGC3Dint location, WGC3Dfloat* value) = 0;
    274     virtual void getUniformiv(WebGLId program, WGC3Dint location, WGC3Dint* value) = 0;
    275     virtual WGC3Dint getUniformLocation(WebGLId program, const WGC3Dchar* name) = 0;
    276     virtual void getVertexAttribfv(WGC3Duint index, WGC3Denum pname, WGC3Dfloat* value) = 0;
    277     virtual void getVertexAttribiv(WGC3Duint index, WGC3Denum pname, WGC3Dint* value) = 0;
    278     virtual WGC3Dsizeiptr getVertexAttribOffset(WGC3Duint index, WGC3Denum pname) = 0;
    279 
    280     virtual void hint(WGC3Denum target, WGC3Denum mode) = 0;
    281     virtual WGC3Dboolean isBuffer(WebGLId buffer) = 0;
    282     virtual WGC3Dboolean isEnabled(WGC3Denum cap) = 0;
    283     virtual WGC3Dboolean isFramebuffer(WebGLId framebuffer) = 0;
    284     virtual WGC3Dboolean isProgram(WebGLId program) = 0;
    285     virtual WGC3Dboolean isRenderbuffer(WebGLId renderbuffer) = 0;
    286     virtual WGC3Dboolean isShader(WebGLId shader) = 0;
    287     virtual WGC3Dboolean isTexture(WebGLId texture) = 0;
    288     virtual void lineWidth(WGC3Dfloat) = 0;
    289     virtual void linkProgram(WebGLId program) = 0;
    290     virtual void pixelStorei(WGC3Denum pname, WGC3Dint param) = 0;
    291     virtual void polygonOffset(WGC3Dfloat factor, WGC3Dfloat units) = 0;
    292 
    293     virtual void readPixels(WGC3Dint x, WGC3Dint y, WGC3Dsizei width, WGC3Dsizei height, WGC3Denum format, WGC3Denum type, void* pixels) = 0;
    294 
    295     virtual void releaseShaderCompiler() = 0;
    296 
    297     virtual void renderbufferStorage(WGC3Denum target, WGC3Denum internalformat, WGC3Dsizei width, WGC3Dsizei height) = 0;
    298     virtual void sampleCoverage(WGC3Dclampf value, WGC3Dboolean invert) = 0;
    299     virtual void scissor(WGC3Dint x, WGC3Dint y, WGC3Dsizei width, WGC3Dsizei height) = 0;
    300     virtual void shaderSource(WebGLId shader, const WGC3Dchar* string) = 0;
    301     virtual void stencilFunc(WGC3Denum func, WGC3Dint ref, WGC3Duint mask) = 0;
    302     virtual void stencilFuncSeparate(WGC3Denum face, WGC3Denum func, WGC3Dint ref, WGC3Duint mask) = 0;
    303     virtual void stencilMask(WGC3Duint mask) = 0;
    304     virtual void stencilMaskSeparate(WGC3Denum face, WGC3Duint mask) = 0;
    305     virtual void stencilOp(WGC3Denum fail, WGC3Denum zfail, WGC3Denum zpass) = 0;
    306     virtual void stencilOpSeparate(WGC3Denum face, WGC3Denum fail, WGC3Denum zfail, WGC3Denum zpass) = 0;
    307 
    308     virtual void texImage2D(WGC3Denum target, WGC3Dint level, WGC3Denum internalformat, WGC3Dsizei width, WGC3Dsizei height, WGC3Dint border, WGC3Denum format, WGC3Denum type, const void* pixels) = 0;
    309 
    310     virtual void texParameterf(WGC3Denum target, WGC3Denum pname, WGC3Dfloat param) = 0;
    311     virtual void texParameteri(WGC3Denum target, WGC3Denum pname, WGC3Dint param) = 0;
    312 
    313     virtual void texSubImage2D(WGC3Denum target, WGC3Dint level, WGC3Dint xoffset, WGC3Dint yoffset, WGC3Dsizei width, WGC3Dsizei height, WGC3Denum format, WGC3Denum type, const void* pixels) = 0;
    314 
    315     virtual void uniform1f(WGC3Dint location, WGC3Dfloat x) = 0;
    316     virtual void uniform1fv(WGC3Dint location, WGC3Dsizei count, const WGC3Dfloat* v) = 0;
    317     virtual void uniform1i(WGC3Dint location, WGC3Dint x) = 0;
    318     virtual void uniform1iv(WGC3Dint location, WGC3Dsizei count, const WGC3Dint* v) = 0;
    319     virtual void uniform2f(WGC3Dint location, WGC3Dfloat x, WGC3Dfloat y) = 0;
    320     virtual void uniform2fv(WGC3Dint location, WGC3Dsizei count, const WGC3Dfloat* v) = 0;
    321     virtual void uniform2i(WGC3Dint location, WGC3Dint x, WGC3Dint y) = 0;
    322     virtual void uniform2iv(WGC3Dint location, WGC3Dsizei count, const WGC3Dint* v) = 0;
    323     virtual void uniform3f(WGC3Dint location, WGC3Dfloat x, WGC3Dfloat y, WGC3Dfloat z) = 0;
    324     virtual void uniform3fv(WGC3Dint location, WGC3Dsizei count, const WGC3Dfloat* v) = 0;
    325     virtual void uniform3i(WGC3Dint location, WGC3Dint x, WGC3Dint y, WGC3Dint z) = 0;
    326     virtual void uniform3iv(WGC3Dint location, WGC3Dsizei count, const WGC3Dint* v) = 0;
    327     virtual void uniform4f(WGC3Dint location, WGC3Dfloat x, WGC3Dfloat y, WGC3Dfloat z, WGC3Dfloat w) = 0;
    328     virtual void uniform4fv(WGC3Dint location, WGC3Dsizei count, const WGC3Dfloat* v) = 0;
    329     virtual void uniform4i(WGC3Dint location, WGC3Dint x, WGC3Dint y, WGC3Dint z, WGC3Dint w) = 0;
    330     virtual void uniform4iv(WGC3Dint location, WGC3Dsizei count, const WGC3Dint* v) = 0;
    331     virtual void uniformMatrix2fv(WGC3Dint location, WGC3Dsizei count, WGC3Dboolean transpose, const WGC3Dfloat* value) = 0;
    332     virtual void uniformMatrix3fv(WGC3Dint location, WGC3Dsizei count, WGC3Dboolean transpose, const WGC3Dfloat* value) = 0;
    333     virtual void uniformMatrix4fv(WGC3Dint location, WGC3Dsizei count, WGC3Dboolean transpose, const WGC3Dfloat* value) = 0;
    334 
    335     virtual void useProgram(WebGLId program) = 0;
    336     virtual void validateProgram(WebGLId program) = 0;
    337 
    338     virtual void vertexAttrib1f(WGC3Duint index, WGC3Dfloat x) = 0;
    339     virtual void vertexAttrib1fv(WGC3Duint index, const WGC3Dfloat* values) = 0;
    340     virtual void vertexAttrib2f(WGC3Duint index, WGC3Dfloat x, WGC3Dfloat y) = 0;
    341     virtual void vertexAttrib2fv(WGC3Duint index, const WGC3Dfloat* values) = 0;
    342     virtual void vertexAttrib3f(WGC3Duint index, WGC3Dfloat x, WGC3Dfloat y, WGC3Dfloat z) = 0;
    343     virtual void vertexAttrib3fv(WGC3Duint index, const WGC3Dfloat* values) = 0;
    344     virtual void vertexAttrib4f(WGC3Duint index, WGC3Dfloat x, WGC3Dfloat y, WGC3Dfloat z, WGC3Dfloat w) = 0;
    345     virtual void vertexAttrib4fv(WGC3Duint index, const WGC3Dfloat* values) = 0;
    346     virtual void vertexAttribPointer(WGC3Duint index, WGC3Dint size, WGC3Denum type, WGC3Dboolean normalized,
    347                                      WGC3Dsizei stride, WGC3Dintptr offset) = 0;
    348 
    349     virtual void viewport(WGC3Dint x, WGC3Dint y, WGC3Dsizei width, WGC3Dsizei height) = 0;
    350 
    351     // Support for buffer creation and deletion.
    352     virtual void genBuffers(WGC3Dsizei count, WebGLId* ids) { }
    353     virtual void genFramebuffers(WGC3Dsizei count, WebGLId* ids) { }
    354     virtual void genRenderbuffers(WGC3Dsizei count, WebGLId* ids) { }
    355     virtual void genTextures(WGC3Dsizei count, WebGLId* ids) { }
    356 
    357     virtual void deleteBuffers(WGC3Dsizei count, WebGLId* ids) { }
    358     virtual void deleteFramebuffers(WGC3Dsizei count, WebGLId* ids) { }
    359     virtual void deleteRenderbuffers(WGC3Dsizei count, WebGLId* ids) { }
    360     virtual void deleteTextures(WGC3Dsizei count, WebGLId* ids) { }
    361 
    362     virtual WebGLId createBuffer() = 0;
    363     virtual WebGLId createFramebuffer() = 0;
    364     virtual WebGLId createRenderbuffer() = 0;
    365     virtual WebGLId createTexture() = 0;
    366 
    367     virtual void deleteBuffer(WebGLId) = 0;
    368     virtual void deleteFramebuffer(WebGLId) = 0;
    369     virtual void deleteRenderbuffer(WebGLId) = 0;
    370     virtual void deleteTexture(WebGLId) = 0;
    371 
    372     virtual WebGLId createProgram() = 0;
    373     virtual WebGLId createShader(WGC3Denum) = 0;
    374 
    375     virtual void deleteShader(WebGLId) = 0;
    376     virtual void deleteProgram(WebGLId) = 0;
    377 
    378     virtual void setContextLostCallback(WebGraphicsContextLostCallback* callback) { }
    379     virtual void setErrorMessageCallback(WebGraphicsErrorMessageCallback* callback) { }
    380     // GL_ARB_robustness
    381     //
    382     // This entry point must provide slightly different semantics than
    383     // the GL_ARB_robustness extension; specifically, the lost context
    384     // state is sticky, rather than reported only once.
    385     virtual WGC3Denum getGraphicsResetStatusARB() { return 0; /* GL_NO_ERROR */ }
    386 
    387     virtual WebString getTranslatedShaderSourceANGLE(WebGLId shader) = 0;
    388 
    389     // GL_CHROMIUM_iosurface
    390     virtual void texImageIOSurface2DCHROMIUM(WGC3Denum target, WGC3Dint width, WGC3Dint height, WGC3Duint ioSurfaceId, WGC3Duint plane) { }
    391 
    392     // GL_EXT_texture_storage
    393     virtual void texStorage2DEXT(WGC3Denum target, WGC3Dint levels, WGC3Duint internalformat,
    394                                  WGC3Dint width, WGC3Dint height) { }
    395 
    396     // GL_EXT_occlusion_query
    397     virtual WebGLId createQueryEXT() { return 0; }
    398     virtual void deleteQueryEXT(WebGLId query) { }
    399     virtual WGC3Dboolean isQueryEXT(WebGLId query) { return false; }
    400     virtual void beginQueryEXT(WGC3Denum target, WebGLId query) { }
    401     virtual void endQueryEXT(WGC3Denum target) { }
    402     virtual void getQueryivEXT(WGC3Denum target, WGC3Denum pname, WGC3Dint* params) { }
    403     virtual void getQueryObjectuivEXT(WebGLId query, WGC3Denum pname, WGC3Duint* params) { }
    404 
    405     // GL_CHROMIUM_bind_uniform_location
    406     virtual void bindUniformLocationCHROMIUM(WebGLId program, WGC3Dint location, const WGC3Dchar* uniform) { }
    407 
    408     // GL_CHROMIUM_copy_texture
    409     virtual void copyTextureCHROMIUM(WGC3Denum target, WGC3Duint sourceId,
    410         WGC3Duint destId, WGC3Dint level, WGC3Denum internalFormat, WGC3Denum destType) { }
    411 
    412     // GL_CHROMIUM_shallow_flush
    413     virtual void shallowFlushCHROMIUM() { }
    414     virtual void shallowFinishCHROMIUM() { }
    415 
    416     // GL_CHROMIUM_texture_mailbox
    417     virtual void genMailboxCHROMIUM(WGC3Dbyte* mailbox) { }
    418     virtual void produceTextureCHROMIUM(WGC3Denum target, const WGC3Dbyte* mailbox) { }
    419     virtual void produceTextureDirectCHROMIUM(WebGLId texture, WGC3Denum target, const WGC3Dbyte* mailbox) { }
    420 
    421     virtual void consumeTextureCHROMIUM(WGC3Denum target, const WGC3Dbyte* mailbox) { }
    422     virtual WebGLId createAndConsumeTextureCHROMIUM(WGC3Denum target, const WGC3Dbyte* mailbox) { return 0; }
    423 
    424     // GL_EXT_debug_marker
    425     virtual void insertEventMarkerEXT(const WGC3Dchar* marker) { }
    426     virtual void pushGroupMarkerEXT(const WGC3Dchar* marker) { }
    427     virtual void popGroupMarkerEXT(void) { }
    428 
    429     // GL_OES_vertex_array_object
    430     virtual WebGLId createVertexArrayOES() { return 0; }
    431     virtual void deleteVertexArrayOES(WebGLId array) { }
    432     virtual WGC3Dboolean isVertexArrayOES(WebGLId array) { return false; }
    433     virtual void bindVertexArrayOES(WebGLId array) { }
    434 
    435     // GL_CHROMIUM_texture_from_image
    436     virtual void bindTexImage2DCHROMIUM(WGC3Denum target, WGC3Dint imageId) { }
    437     virtual void releaseTexImage2DCHROMIUM(WGC3Denum target, WGC3Dint imageId) { }
    438 
    439     // GL_CHROMIUM_pixel_transfer_buffer_object
    440     virtual void* mapBufferCHROMIUM(WGC3Denum target, WGC3Denum access) { return 0; }
    441     virtual WGC3Dboolean unmapBufferCHROMIUM(WGC3Denum target) { return false; }
    442 
    443     // GL_CHROMIUM_async_pixel_transfers
    444     virtual void asyncTexImage2DCHROMIUM(WGC3Denum target, WGC3Dint level, WGC3Denum internalformat, WGC3Dsizei width, WGC3Dsizei height, WGC3Dint border, WGC3Denum format, WGC3Denum type, const void* pixels) { }
    445     virtual void asyncTexSubImage2DCHROMIUM(WGC3Denum target, WGC3Dint level, WGC3Dint xoffset, WGC3Dint yoffset, WGC3Dsizei width, WGC3Dsizei height, WGC3Denum format, WGC3Denum type, const void* pixels) { }
    446     virtual void waitAsyncTexImage2DCHROMIUM(WGC3Denum) { }
    447 
    448     // GL_EXT_draw_buffers
    449     virtual void drawBuffersEXT(WGC3Dsizei n, const WGC3Denum* bufs) { }
    450 
    451     virtual GrGLInterface* createGrGLInterface() { return 0; }
    452 
    453     // GL_CHROMIUM_map_image
    454     virtual WGC3Duint createImageCHROMIUM(WGC3Dsizei width, WGC3Dsizei height, WGC3Denum internalformat, WGC3Denum usage) { return 0; }
    455     virtual void destroyImageCHROMIUM(WGC3Duint imageId) { }
    456     virtual void getImageParameterivCHROMIUM(WGC3Duint imageId, WGC3Denum pname, WGC3Dint* params) { }
    457     virtual void* mapImageCHROMIUM(WGC3Duint imageId) { return 0; }
    458     virtual void unmapImageCHROMIUM(WGC3Duint imageId) { }
    459 
    460     // GL_ANGLE_instanced_arrays
    461     virtual void drawArraysInstancedANGLE(WGC3Denum mode, WGC3Dint first, WGC3Dsizei count, WGC3Dsizei primcount) { }
    462     virtual void drawElementsInstancedANGLE(WGC3Denum mode, WGC3Dsizei count, WGC3Denum type, WGC3Dintptr offset, WGC3Dsizei primcount) { }
    463     virtual void vertexAttribDivisorANGLE(WGC3Duint index, WGC3Duint divisor) { }
    464 
    465     // GL_EXT_multisampled_render_to_texture
    466     virtual void framebufferTexture2DMultisampleEXT(WGC3Denum target, WGC3Denum attachment, WGC3Denum textarget, WebGLId texture, WGC3Dint level, WGC3Dsizei samples) { }
    467     virtual void renderbufferStorageMultisampleEXT(WGC3Denum target, WGC3Dsizei samples, WGC3Denum internalformat, WGC3Dsizei width, WGC3Dsizei height) { };
    468 };
    469 
    470 } // namespace blink
    471 
    472 #endif
    473