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
38struct GrGLInterface;
39
40namespace 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.
44typedef char WGC3Dchar;
45typedef unsigned int WGC3Denum;
46typedef unsigned char WGC3Dboolean;
47typedef unsigned int WGC3Dbitfield;
48typedef signed char WGC3Dbyte;
49typedef unsigned char WGC3Dubyte;
50typedef short WGC3Dshort;
51typedef unsigned short WGC3Dushort;
52typedef int WGC3Dint;
53typedef int WGC3Dsizei;
54typedef unsigned int WGC3Duint;
55typedef float WGC3Dfloat;
56typedef float WGC3Dclampf;
57typedef signed long int WGC3Dintptr;
58typedef signed long int WGC3Dsizeiptr;
59
60// Typedef for server-side objects like OpenGL textures and program objects.
61typedef 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//
68// Creating a WebGraphicsContext does not make it current, or guarantee
69// that the context has been created successfully. Use
70// makeContextCurrent() to complete initialization of the context, treating
71// a false return value as indication that the context could not be created
72// successfully.
73class WebGraphicsContext3D : public WebNonCopyable {
74public:
75    // Return value from getActiveUniform and getActiveAttrib.
76    struct ActiveInfo {
77        WebString name;
78        WGC3Denum type;
79        WGC3Dint size;
80    };
81
82    // Context creation attributes.
83    struct Attributes {
84        Attributes()
85            : alpha(true)
86            , depth(true)
87            , stencil(true)
88            , antialias(true)
89            , premultipliedAlpha(true)
90            , canRecoverFromContextLoss(true)
91            , noExtensions(false)
92            , shareResources(true)
93            , preferDiscreteGPU(false)
94            , noAutomaticFlushes(false)
95            , failIfMajorPerformanceCaveat(false)
96        {
97        }
98
99        bool alpha;
100        bool depth;
101        bool stencil;
102        bool antialias;
103        bool premultipliedAlpha;
104        bool canRecoverFromContextLoss;
105        bool noExtensions;
106        bool shareResources;
107        bool preferDiscreteGPU;
108        bool noAutomaticFlushes;
109        bool failIfMajorPerformanceCaveat;
110        // FIXME: ideally this would be a WebURL, but it is currently not
111        // possible to pass a WebURL by value across the WebKit API boundary.
112        // See https://bugs.webkit.org/show_bug.cgi?id=103793#c13 .
113        WebString topDocumentURL;
114    };
115
116    class WebGraphicsContextLostCallback {
117    public:
118        virtual void onContextLost() = 0;
119
120    protected:
121        virtual ~WebGraphicsContextLostCallback() { }
122    };
123
124    class WebGraphicsErrorMessageCallback {
125    public:
126        virtual void onErrorMessage(const WebString&, WGC3Dint) = 0;
127
128    protected:
129        virtual ~WebGraphicsErrorMessageCallback() { }
130    };
131
132    class WebGraphicsSwapBuffersCompleteCallbackCHROMIUM {
133    public:
134        virtual void onSwapBuffersComplete() = 0;
135
136    protected:
137        virtual ~WebGraphicsSwapBuffersCompleteCallbackCHROMIUM() { }
138    };
139
140    // This destructor needs to be public so that using classes can destroy instances if initialization fails.
141    virtual ~WebGraphicsContext3D() { }
142
143    // Makes the OpenGL context current on the current thread. Returns true on
144    // success.
145    virtual bool makeContextCurrent() = 0;
146
147    // Each flush or finish is assigned an unique ID. The larger
148    // the ID number, the more recently the context has been flushed.
149    virtual uint32_t lastFlushID() { return 0; }
150
151    // Resizes the region into which this WebGraphicsContext3D is drawing.
152    virtual void reshapeWithScaleFactor(int width, int height, float scaleFactor) { }
153
154    // GL_CHROMIUM_setVisibility - Changes the visibility of the backbuffer
155    virtual void setVisibilityCHROMIUM(bool visible) = 0;
156
157    // GL_EXT_discard_framebuffer - makes specified attachments of currently bound framebuffer undefined.
158    virtual void discardFramebufferEXT(WGC3Denum target, WGC3Dsizei numAttachments, const WGC3Denum* attachments) { }
159
160    // GL_CHROMIUM_discard_backbuffer - controls allocation/deallocation of the back buffer.
161    virtual void discardBackbufferCHROMIUM() { }
162    virtual void ensureBackbufferCHROMIUM() { }
163
164    virtual unsigned insertSyncPoint() { return 0; }
165    virtual void waitSyncPoint(unsigned) { }
166
167    // Copies the contents of the off-screen render target used by the WebGL
168    // context to the corresponding texture used by the compositor.
169    virtual void prepareTexture() = 0;
170
171    // GL_CHROMIUM_post_sub_buffer - Copies part of the back buffer to the front buffer.
172    virtual void postSubBufferCHROMIUM(int x, int y, int width, int height) = 0;
173
174    // Synthesizes an OpenGL error which will be returned from a
175    // later call to getError. This is used to emulate OpenGL ES
176    // 2.0 behavior on the desktop and to enforce additional error
177    // checking mandated by WebGL.
178    //
179    // Per the behavior of glGetError, this stores at most one
180    // instance of any given error, and returns them from calls to
181    // getError in the order they were added.
182    virtual void synthesizeGLError(WGC3Denum) = 0;
183
184    virtual bool isContextLost() = 0;
185
186    // GL_CHROMIUM_map_sub
187    virtual void* mapBufferSubDataCHROMIUM(WGC3Denum target, WGC3Dintptr offset, WGC3Dsizeiptr size, WGC3Denum access) = 0;
188    virtual void unmapBufferSubDataCHROMIUM(const void*) = 0;
189    virtual void* mapTexSubImage2DCHROMIUM(WGC3Denum target, WGC3Dint level, WGC3Dint xoffset, WGC3Dint yoffset, WGC3Dsizei width, WGC3Dsizei height, WGC3Denum format, WGC3Denum type, WGC3Denum access) = 0;
190    virtual void unmapTexSubImage2DCHROMIUM(const void*) = 0;
191
192    // GL_CHROMIUM_request_extension
193    virtual WebString getRequestableExtensionsCHROMIUM() = 0;
194    virtual void requestExtensionCHROMIUM(const char*) = 0;
195
196    // GL_CHROMIUM_framebuffer_multisample
197    virtual void blitFramebufferCHROMIUM(WGC3Dint srcX0, WGC3Dint srcY0, WGC3Dint srcX1, WGC3Dint srcY1, WGC3Dint dstX0, WGC3Dint dstY0, WGC3Dint dstX1, WGC3Dint dstY1, WGC3Dbitfield mask, WGC3Denum filter) = 0;
198    virtual void renderbufferStorageMultisampleCHROMIUM(WGC3Denum target, WGC3Dsizei samples, WGC3Denum internalformat, WGC3Dsizei width, WGC3Dsizei height) = 0;
199
200    // GL_CHROMIUM_swapbuffers_complete_callback
201    virtual void setSwapBuffersCompleteCallbackCHROMIUM(WebGraphicsSwapBuffersCompleteCallbackCHROMIUM* callback) { }
202
203    // GL_CHROMIUM_rate_limit_offscreen_context
204    virtual void rateLimitOffscreenContextCHROMIUM() { }
205
206    // GL_CHROMIUM_stream_texture
207    // Returns the stream end point identifier created for the given texture.
208    virtual WebGLId createStreamTextureCHROMIUM(WebGLId texture) { return 0; }
209    // Destroys the stream for the given texture.
210    virtual void destroyStreamTextureCHROMIUM(WebGLId texture) { }
211
212    // GL_CHROMIUM_lose_context
213    virtual void loseContextCHROMIUM(WGC3Denum current, WGC3Denum other) { }
214
215    // The entry points below map directly to the OpenGL ES 2.0 API.
216    // See: http://www.khronos.org/registry/gles/
217    // and: http://www.khronos.org/opengles/sdk/docs/man/
218    virtual void activeTexture(WGC3Denum texture) = 0;
219    virtual void attachShader(WebGLId program, WebGLId shader) = 0;
220    virtual void bindAttribLocation(WebGLId program, WGC3Duint index, const WGC3Dchar* name) = 0;
221    virtual void bindBuffer(WGC3Denum target, WebGLId buffer) = 0;
222    virtual void bindFramebuffer(WGC3Denum target, WebGLId framebuffer) = 0;
223    virtual void bindRenderbuffer(WGC3Denum target, WebGLId renderbuffer) = 0;
224    virtual void bindTexture(WGC3Denum target, WebGLId texture) = 0;
225    virtual void blendColor(WGC3Dclampf red, WGC3Dclampf green, WGC3Dclampf blue, WGC3Dclampf alpha) = 0;
226    virtual void blendEquation(WGC3Denum mode) = 0;
227    virtual void blendEquationSeparate(WGC3Denum modeRGB, WGC3Denum modeAlpha) = 0;
228    virtual void blendFunc(WGC3Denum sfactor, WGC3Denum dfactor) = 0;
229    virtual void blendFuncSeparate(WGC3Denum srcRGB, WGC3Denum dstRGB, WGC3Denum srcAlpha, WGC3Denum dstAlpha) = 0;
230
231    virtual void bufferData(WGC3Denum target, WGC3Dsizeiptr size, const void* data, WGC3Denum usage) = 0;
232    virtual void bufferSubData(WGC3Denum target, WGC3Dintptr offset, WGC3Dsizeiptr size, const void* data) = 0;
233
234    virtual WGC3Denum checkFramebufferStatus(WGC3Denum target) = 0;
235    virtual void clear(WGC3Dbitfield mask) = 0;
236    virtual void clearColor(WGC3Dclampf red, WGC3Dclampf green, WGC3Dclampf blue, WGC3Dclampf alpha) = 0;
237    virtual void clearDepth(WGC3Dclampf depth) = 0;
238    virtual void clearStencil(WGC3Dint s) = 0;
239    virtual void colorMask(WGC3Dboolean red, WGC3Dboolean green, WGC3Dboolean blue, WGC3Dboolean alpha) = 0;
240    virtual void compileShader(WebGLId shader) = 0;
241
242    virtual void compressedTexImage2D(WGC3Denum target, WGC3Dint level, WGC3Denum internalformat, WGC3Dsizei width, WGC3Dsizei height, WGC3Dint border, WGC3Dsizei imageSize, const void* data) = 0;
243    virtual void compressedTexSubImage2D(WGC3Denum target, WGC3Dint level, WGC3Dint xoffset, WGC3Dint yoffset, WGC3Dsizei width, WGC3Dsizei height, WGC3Denum format, WGC3Dsizei imageSize, const void* data) = 0;
244    virtual void copyTexImage2D(WGC3Denum target, WGC3Dint level, WGC3Denum internalformat, WGC3Dint x, WGC3Dint y, WGC3Dsizei width, WGC3Dsizei height, WGC3Dint border) = 0;
245    virtual void copyTexSubImage2D(WGC3Denum target, WGC3Dint level, WGC3Dint xoffset, WGC3Dint yoffset, WGC3Dint x, WGC3Dint y, WGC3Dsizei width, WGC3Dsizei height) = 0;
246    virtual void cullFace(WGC3Denum mode) = 0;
247    virtual void depthFunc(WGC3Denum func) = 0;
248    virtual void depthMask(WGC3Dboolean flag) = 0;
249    virtual void depthRange(WGC3Dclampf zNear, WGC3Dclampf zFar) = 0;
250    virtual void detachShader(WebGLId program, WebGLId shader) = 0;
251    virtual void disable(WGC3Denum cap) = 0;
252    virtual void disableVertexAttribArray(WGC3Duint index) = 0;
253    virtual void drawArrays(WGC3Denum mode, WGC3Dint first, WGC3Dsizei count) = 0;
254    virtual void drawElements(WGC3Denum mode, WGC3Dsizei count, WGC3Denum type, WGC3Dintptr offset) = 0;
255
256    virtual void enable(WGC3Denum cap) = 0;
257    virtual void enableVertexAttribArray(WGC3Duint index) = 0;
258    virtual void finish() = 0;
259    virtual void flush() = 0;
260    virtual void framebufferRenderbuffer(WGC3Denum target, WGC3Denum attachment, WGC3Denum renderbuffertarget, WebGLId renderbuffer) = 0;
261    virtual void framebufferTexture2D(WGC3Denum target, WGC3Denum attachment, WGC3Denum textarget, WebGLId texture, WGC3Dint level) = 0;
262    virtual void frontFace(WGC3Denum mode) = 0;
263    virtual void generateMipmap(WGC3Denum target) = 0;
264
265    virtual bool getActiveAttrib(WebGLId program, WGC3Duint index, ActiveInfo&) = 0;
266    virtual bool getActiveUniform(WebGLId program, WGC3Duint index, ActiveInfo&) = 0;
267    virtual void getAttachedShaders(WebGLId program, WGC3Dsizei maxCount, WGC3Dsizei* count, WebGLId* shaders) = 0;
268    virtual WGC3Dint getAttribLocation(WebGLId program, const WGC3Dchar* name) = 0;
269    virtual void getBooleanv(WGC3Denum pname, WGC3Dboolean* value) = 0;
270    virtual void getBufferParameteriv(WGC3Denum target, WGC3Denum pname, WGC3Dint* value) = 0;
271    virtual Attributes getContextAttributes() = 0;
272    virtual WGC3Denum getError() = 0;
273    virtual void getFloatv(WGC3Denum pname, WGC3Dfloat* value) = 0;
274    virtual void getFramebufferAttachmentParameteriv(WGC3Denum target, WGC3Denum attachment, WGC3Denum pname, WGC3Dint* value) = 0;
275    virtual void getIntegerv(WGC3Denum pname, WGC3Dint* value) = 0;
276    virtual void getProgramiv(WebGLId program, WGC3Denum pname, WGC3Dint* value) = 0;
277    virtual WebString getProgramInfoLog(WebGLId program) = 0;
278    virtual void getRenderbufferParameteriv(WGC3Denum target, WGC3Denum pname, WGC3Dint* value) = 0;
279    virtual void getShaderiv(WebGLId shader, WGC3Denum pname, WGC3Dint* value) = 0;
280    virtual WebString getShaderInfoLog(WebGLId shader) = 0;
281    virtual void getShaderPrecisionFormat(WGC3Denum shadertype, WGC3Denum precisiontype, WGC3Dint* range, WGC3Dint* precision) = 0;
282    virtual WebString getShaderSource(WebGLId shader) = 0;
283    virtual WebString getString(WGC3Denum name) = 0;
284    virtual void getTexParameterfv(WGC3Denum target, WGC3Denum pname, WGC3Dfloat* value) = 0;
285    virtual void getTexParameteriv(WGC3Denum target, WGC3Denum pname, WGC3Dint* value) = 0;
286    virtual void getUniformfv(WebGLId program, WGC3Dint location, WGC3Dfloat* value) = 0;
287    virtual void getUniformiv(WebGLId program, WGC3Dint location, WGC3Dint* value) = 0;
288    virtual WGC3Dint getUniformLocation(WebGLId program, const WGC3Dchar* name) = 0;
289    virtual void getVertexAttribfv(WGC3Duint index, WGC3Denum pname, WGC3Dfloat* value) = 0;
290    virtual void getVertexAttribiv(WGC3Duint index, WGC3Denum pname, WGC3Dint* value) = 0;
291    virtual WGC3Dsizeiptr getVertexAttribOffset(WGC3Duint index, WGC3Denum pname) = 0;
292
293    virtual void hint(WGC3Denum target, WGC3Denum mode) = 0;
294    virtual WGC3Dboolean isBuffer(WebGLId buffer) = 0;
295    virtual WGC3Dboolean isEnabled(WGC3Denum cap) = 0;
296    virtual WGC3Dboolean isFramebuffer(WebGLId framebuffer) = 0;
297    virtual WGC3Dboolean isProgram(WebGLId program) = 0;
298    virtual WGC3Dboolean isRenderbuffer(WebGLId renderbuffer) = 0;
299    virtual WGC3Dboolean isShader(WebGLId shader) = 0;
300    virtual WGC3Dboolean isTexture(WebGLId texture) = 0;
301    virtual void lineWidth(WGC3Dfloat) = 0;
302    virtual void linkProgram(WebGLId program) = 0;
303    virtual void pixelStorei(WGC3Denum pname, WGC3Dint param) = 0;
304    virtual void polygonOffset(WGC3Dfloat factor, WGC3Dfloat units) = 0;
305
306    virtual void readPixels(WGC3Dint x, WGC3Dint y, WGC3Dsizei width, WGC3Dsizei height, WGC3Denum format, WGC3Denum type, void* pixels) = 0;
307
308    virtual void releaseShaderCompiler() = 0;
309
310    virtual void renderbufferStorage(WGC3Denum target, WGC3Denum internalformat, WGC3Dsizei width, WGC3Dsizei height) = 0;
311    virtual void sampleCoverage(WGC3Dclampf value, WGC3Dboolean invert) = 0;
312    virtual void scissor(WGC3Dint x, WGC3Dint y, WGC3Dsizei width, WGC3Dsizei height) = 0;
313    virtual void shaderSource(WebGLId shader, const WGC3Dchar* string) = 0;
314    virtual void stencilFunc(WGC3Denum func, WGC3Dint ref, WGC3Duint mask) = 0;
315    virtual void stencilFuncSeparate(WGC3Denum face, WGC3Denum func, WGC3Dint ref, WGC3Duint mask) = 0;
316    virtual void stencilMask(WGC3Duint mask) = 0;
317    virtual void stencilMaskSeparate(WGC3Denum face, WGC3Duint mask) = 0;
318    virtual void stencilOp(WGC3Denum fail, WGC3Denum zfail, WGC3Denum zpass) = 0;
319    virtual void stencilOpSeparate(WGC3Denum face, WGC3Denum fail, WGC3Denum zfail, WGC3Denum zpass) = 0;
320
321    virtual void texImage2D(WGC3Denum target, WGC3Dint level, WGC3Denum internalformat, WGC3Dsizei width, WGC3Dsizei height, WGC3Dint border, WGC3Denum format, WGC3Denum type, const void* pixels) = 0;
322
323    virtual void texParameterf(WGC3Denum target, WGC3Denum pname, WGC3Dfloat param) = 0;
324    virtual void texParameteri(WGC3Denum target, WGC3Denum pname, WGC3Dint param) = 0;
325
326    virtual void texSubImage2D(WGC3Denum target, WGC3Dint level, WGC3Dint xoffset, WGC3Dint yoffset, WGC3Dsizei width, WGC3Dsizei height, WGC3Denum format, WGC3Denum type, const void* pixels) = 0;
327
328    virtual void uniform1f(WGC3Dint location, WGC3Dfloat x) = 0;
329    virtual void uniform1fv(WGC3Dint location, WGC3Dsizei count, const WGC3Dfloat* v) = 0;
330    virtual void uniform1i(WGC3Dint location, WGC3Dint x) = 0;
331    virtual void uniform1iv(WGC3Dint location, WGC3Dsizei count, const WGC3Dint* v) = 0;
332    virtual void uniform2f(WGC3Dint location, WGC3Dfloat x, WGC3Dfloat y) = 0;
333    virtual void uniform2fv(WGC3Dint location, WGC3Dsizei count, const WGC3Dfloat* v) = 0;
334    virtual void uniform2i(WGC3Dint location, WGC3Dint x, WGC3Dint y) = 0;
335    virtual void uniform2iv(WGC3Dint location, WGC3Dsizei count, const WGC3Dint* v) = 0;
336    virtual void uniform3f(WGC3Dint location, WGC3Dfloat x, WGC3Dfloat y, WGC3Dfloat z) = 0;
337    virtual void uniform3fv(WGC3Dint location, WGC3Dsizei count, const WGC3Dfloat* v) = 0;
338    virtual void uniform3i(WGC3Dint location, WGC3Dint x, WGC3Dint y, WGC3Dint z) = 0;
339    virtual void uniform3iv(WGC3Dint location, WGC3Dsizei count, const WGC3Dint* v) = 0;
340    virtual void uniform4f(WGC3Dint location, WGC3Dfloat x, WGC3Dfloat y, WGC3Dfloat z, WGC3Dfloat w) = 0;
341    virtual void uniform4fv(WGC3Dint location, WGC3Dsizei count, const WGC3Dfloat* v) = 0;
342    virtual void uniform4i(WGC3Dint location, WGC3Dint x, WGC3Dint y, WGC3Dint z, WGC3Dint w) = 0;
343    virtual void uniform4iv(WGC3Dint location, WGC3Dsizei count, const WGC3Dint* v) = 0;
344    virtual void uniformMatrix2fv(WGC3Dint location, WGC3Dsizei count, WGC3Dboolean transpose, const WGC3Dfloat* value) = 0;
345    virtual void uniformMatrix3fv(WGC3Dint location, WGC3Dsizei count, WGC3Dboolean transpose, const WGC3Dfloat* value) = 0;
346    virtual void uniformMatrix4fv(WGC3Dint location, WGC3Dsizei count, WGC3Dboolean transpose, const WGC3Dfloat* value) = 0;
347
348    virtual void useProgram(WebGLId program) = 0;
349    virtual void validateProgram(WebGLId program) = 0;
350
351    virtual void vertexAttrib1f(WGC3Duint index, WGC3Dfloat x) = 0;
352    virtual void vertexAttrib1fv(WGC3Duint index, const WGC3Dfloat* values) = 0;
353    virtual void vertexAttrib2f(WGC3Duint index, WGC3Dfloat x, WGC3Dfloat y) = 0;
354    virtual void vertexAttrib2fv(WGC3Duint index, const WGC3Dfloat* values) = 0;
355    virtual void vertexAttrib3f(WGC3Duint index, WGC3Dfloat x, WGC3Dfloat y, WGC3Dfloat z) = 0;
356    virtual void vertexAttrib3fv(WGC3Duint index, const WGC3Dfloat* values) = 0;
357    virtual void vertexAttrib4f(WGC3Duint index, WGC3Dfloat x, WGC3Dfloat y, WGC3Dfloat z, WGC3Dfloat w) = 0;
358    virtual void vertexAttrib4fv(WGC3Duint index, const WGC3Dfloat* values) = 0;
359    virtual void vertexAttribPointer(WGC3Duint index, WGC3Dint size, WGC3Denum type, WGC3Dboolean normalized,
360                                     WGC3Dsizei stride, WGC3Dintptr offset) = 0;
361
362    virtual void viewport(WGC3Dint x, WGC3Dint y, WGC3Dsizei width, WGC3Dsizei height) = 0;
363
364    // Support for buffer creation and deletion.
365    virtual void genBuffers(WGC3Dsizei count, WebGLId* ids) { }
366    virtual void genFramebuffers(WGC3Dsizei count, WebGLId* ids) { }
367    virtual void genRenderbuffers(WGC3Dsizei count, WebGLId* ids) { }
368    virtual void genTextures(WGC3Dsizei count, WebGLId* ids) { }
369
370    virtual void deleteBuffers(WGC3Dsizei count, WebGLId* ids) { }
371    virtual void deleteFramebuffers(WGC3Dsizei count, WebGLId* ids) { }
372    virtual void deleteRenderbuffers(WGC3Dsizei count, WebGLId* ids) { }
373    virtual void deleteTextures(WGC3Dsizei count, WebGLId* ids) { }
374
375    virtual WebGLId createBuffer() = 0;
376    virtual WebGLId createFramebuffer() = 0;
377    virtual WebGLId createRenderbuffer() = 0;
378    virtual WebGLId createTexture() = 0;
379
380    virtual void deleteBuffer(WebGLId) = 0;
381    virtual void deleteFramebuffer(WebGLId) = 0;
382    virtual void deleteRenderbuffer(WebGLId) = 0;
383    virtual void deleteTexture(WebGLId) = 0;
384
385    virtual WebGLId createProgram() = 0;
386    virtual WebGLId createShader(WGC3Denum) = 0;
387
388    virtual void deleteShader(WebGLId) = 0;
389    virtual void deleteProgram(WebGLId) = 0;
390
391    virtual void setContextLostCallback(WebGraphicsContextLostCallback* callback) { }
392    virtual void setErrorMessageCallback(WebGraphicsErrorMessageCallback* callback) { }
393    // GL_ARB_robustness
394    //
395    // This entry point must provide slightly different semantics than
396    // the GL_ARB_robustness extension; specifically, the lost context
397    // state is sticky, rather than reported only once.
398    virtual WGC3Denum getGraphicsResetStatusARB() { return 0; /* GL_NO_ERROR */ }
399
400    // FIXME: make this function pure virtual once it is implemented in
401    // both command buffer port and in-process port.
402    virtual WebString getTranslatedShaderSourceANGLE(WebGLId shader) { return WebString(); }
403
404    // GL_CHROMIUM_iosurface
405    virtual void texImageIOSurface2DCHROMIUM(WGC3Denum target, WGC3Dint width, WGC3Dint height, WGC3Duint ioSurfaceId, WGC3Duint plane) { }
406
407    // GL_EXT_texture_storage
408    virtual void texStorage2DEXT(WGC3Denum target, WGC3Dint levels, WGC3Duint internalformat,
409                                 WGC3Dint width, WGC3Dint height) { }
410
411    // GL_EXT_occlusion_query
412    virtual WebGLId createQueryEXT() { return 0; }
413    virtual void deleteQueryEXT(WebGLId query) { }
414    virtual WGC3Dboolean isQueryEXT(WebGLId query) { return false; }
415    virtual void beginQueryEXT(WGC3Denum target, WebGLId query) { }
416    virtual void endQueryEXT(WGC3Denum target) { }
417    virtual void getQueryivEXT(WGC3Denum target, WGC3Denum pname, WGC3Dint* params) { }
418    virtual void getQueryObjectuivEXT(WebGLId query, WGC3Denum pname, WGC3Duint* params) { }
419
420    // GL_CHROMIUM_bind_uniform_location
421    virtual void bindUniformLocationCHROMIUM(WebGLId program, WGC3Dint location, const WGC3Dchar* uniform) { }
422
423    // GL_CHROMIUM_copy_texture
424    virtual void copyTextureCHROMIUM(WGC3Denum target, WGC3Duint sourceId,
425        WGC3Duint destId, WGC3Dint level, WGC3Denum internalFormat, WGC3Denum destType) { }
426
427    // GL_CHROMIUM_shallow_flush
428    virtual void shallowFlushCHROMIUM() { }
429    virtual void shallowFinishCHROMIUM() { }
430
431    // GL_CHROMIUM_texture_mailbox
432    virtual void genMailboxCHROMIUM(WGC3Dbyte* mailbox) { }
433    virtual void produceTextureCHROMIUM(WGC3Denum target, const WGC3Dbyte* mailbox) { }
434    virtual void consumeTextureCHROMIUM(WGC3Denum target, const WGC3Dbyte* mailbox) { }
435
436    // GL_EXT_debug_marker
437    virtual void insertEventMarkerEXT(const WGC3Dchar* marker) { }
438    virtual void pushGroupMarkerEXT(const WGC3Dchar* marker) { }
439    virtual void popGroupMarkerEXT(void) { }
440
441    // GL_OES_vertex_array_object
442    virtual WebGLId createVertexArrayOES() { return 0; }
443    virtual void deleteVertexArrayOES(WebGLId array) { }
444    virtual WGC3Dboolean isVertexArrayOES(WebGLId array) { return false; }
445    virtual void bindVertexArrayOES(WebGLId array) { }
446
447    // GL_CHROMIUM_texture_from_image
448    virtual void bindTexImage2DCHROMIUM(WGC3Denum target, WGC3Dint imageId) { }
449    virtual void releaseTexImage2DCHROMIUM(WGC3Denum target, WGC3Dint imageId) { }
450
451    // GL_CHROMIUM_pixel_transfer_buffer_object
452    virtual void* mapBufferCHROMIUM(WGC3Denum target, WGC3Denum access) { return 0; }
453    virtual WGC3Dboolean unmapBufferCHROMIUM(WGC3Denum target) { return false; }
454
455    // GL_CHROMIUM_async_pixel_transfers
456    virtual void asyncTexImage2DCHROMIUM(WGC3Denum target, WGC3Dint level, WGC3Denum internalformat, WGC3Dsizei width, WGC3Dsizei height, WGC3Dint border, WGC3Denum format, WGC3Denum type, const void* pixels) { }
457    virtual void asyncTexSubImage2DCHROMIUM(WGC3Denum target, WGC3Dint level, WGC3Dint xoffset, WGC3Dint yoffset, WGC3Dsizei width, WGC3Dsizei height, WGC3Denum format, WGC3Denum type, const void* pixels) { }
458    virtual void waitAsyncTexImage2DCHROMIUM(WGC3Denum) { }
459
460    // GL_EXT_draw_buffers
461    virtual void drawBuffersEXT(WGC3Dsizei n, const WGC3Denum* bufs) { }
462
463    virtual GrGLInterface* createGrGLInterface() { return 0; }
464
465    // GL_CHROMIUM_map_image
466    virtual WGC3Duint createImageCHROMIUM(WGC3Dsizei width, WGC3Dsizei height, WGC3Denum internalformat) { return 0; }
467    virtual void destroyImageCHROMIUM(WGC3Duint imageId) { }
468    virtual void getImageParameterivCHROMIUM(WGC3Duint imageId, WGC3Denum pname, WGC3Dint* params) { }
469    virtual void* mapImageCHROMIUM(WGC3Duint imageId, WGC3Denum access) { return 0; }
470    virtual void unmapImageCHROMIUM(WGC3Duint imageId) { }
471
472    // GL_ANGLE_instanced_arrays
473    virtual void drawArraysInstancedANGLE(WGC3Denum mode, WGC3Dint first, WGC3Dsizei count, WGC3Dsizei primcount) { }
474    virtual void drawElementsInstancedANGLE(WGC3Denum mode, WGC3Dsizei count, WGC3Denum type, WGC3Dintptr offset, WGC3Dsizei primcount) { }
475    virtual void vertexAttribDivisorANGLE(WGC3Duint index, WGC3Duint divisor) { }
476};
477
478} // namespace blink
479
480#endif
481