Support using OpenGL ES context on desktop

src/gpu/gl/android/GrGLCreateNativeInterface_android.cpp

 // Modified from chromium/src/webkit/glue/gl_bindings_skia_cmd_buffer.cc
 
 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLAssembleInterface.h"
 #include "gl/GrGLExtensions.h"
 #include "gl/GrGLUtil.h"
 
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES
 #endif
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
 #include <EGL/egl.h>
 
-static GrGLInterface* create_es_interface(GrGLVersion version,
-                                          GrGLExtensions* extensions) {
-    if (version < GR_GL_VER(2,0)) {
-        return NULL;
-    }
+#define GET_PROC(F) functions->f ## F = (GrGL ## F ## Proc) get(ctx, "gl" #F)
+#define GET_PROC_SUFFIX(F, S) functions->f ## F = (GrGL ## F ## Proc) get(ctx, "gl" #F #S)
+#define GET_PROC_LOCAL(F) GrGL ## F ## Proc F = (GrGL ## F ## Proc) get(ctx, "gl" #F)
 
-    GrGLInterface* interface = SkNEW(GrGLInterface);
-    interface->fStandard = kGLES_GrGLStandard;
-    GrGLInterface::Functions* functions = &interface->fFunctions;
+#define GET_LINKED(F) functions->f ## F = gl ## F
+#define GET_LINKED_SUFFIX(F, S) functions->f ## F = gl ## F ##S
+#define USE_LINKED 1
 
-    functions->fActiveTexture = glActiveTexture;
-    functions->fAttachShader = glAttachShader;
-    functions->fBindAttribLocation = glBindAttribLocation;
-    functions->fBindBuffer = glBindBuffer;
-    functions->fBindTexture = glBindTexture;
-    functions->fBindVertexArray = glBindVertexArrayOES;
-    functions->fBlendColor = glBlendColor;
-    functions->fBlendFunc = glBlendFunc;
-    functions->fBufferData = glBufferData;
-    functions->fBufferSubData = glBufferSubData;
-    functions->fClear = glClear;
-    functions->fClearColor = glClearColor;
-    functions->fClearStencil = glClearStencil;
-    functions->fColorMask = glColorMask;
-    functions->fCompileShader = glCompileShader;
-    functions->fCompressedTexImage2D = glCompressedTexImage2D;
-    functions->fCompressedTexSubImage2D = glCompressedTexSubImage2D;
-    functions->fCopyTexSubImage2D = glCopyTexSubImage2D;
-    functions->fCreateProgram = glCreateProgram;
-    functions->fCreateShader = glCreateShader;
-    functions->fCullFace = glCullFace;
-    functions->fDeleteBuffers = glDeleteBuffers;
-    functions->fDeleteProgram = glDeleteProgram;
-    functions->fDeleteShader = glDeleteShader;
-    functions->fDeleteTextures = glDeleteTextures;
-    functions->fDeleteVertexArrays = glDeleteVertexArraysOES;
-    functions->fDepthMask = glDepthMask;
-    functions->fDisable = glDisable;
-    functions->fDisableVertexAttribArray = glDisableVertexAttribArray;
-    functions->fDrawArrays = glDrawArrays;
-    functions->fDrawElements = glDrawElements;
-    functions->fEnable = glEnable;
-    functions->fEnableVertexAttribArray = glEnableVertexAttribArray;
-    functions->fFinish = glFinish;
-    functions->fFlush = glFlush;
-    functions->fFrontFace = glFrontFace;
-    functions->fGenBuffers = glGenBuffers;
-    functions->fGenerateMipmap = glGenerateMipmap;
-    functions->fGenTextures = glGenTextures;
-    functions->fGenVertexArrays = glGenVertexArraysOES;
-    functions->fGetBufferParameteriv = glGetBufferParameteriv;
-    functions->fGetError = glGetError;
-    functions->fGetIntegerv = glGetIntegerv;
-    functions->fGetProgramInfoLog = glGetProgramInfoLog;
-    functions->fGetProgramiv = glGetProgramiv;
-    functions->fGetShaderInfoLog = glGetShaderInfoLog;
-    functions->fGetShaderiv = glGetShaderiv;
-    functions->fGetString = glGetString;
-#if GL_ES_VERSION_3_0
-    functions->fGetStringi = glGetStringi;
-#else
-    functions->fGetStringi = (GrGLGetStringiProc) eglGetProcAddress("glGetStringi");
-#endif
-    functions->fGetUniformLocation = glGetUniformLocation;
-    functions->fLineWidth = glLineWidth;
-    functions->fLinkProgram = glLinkProgram;
-    functions->fPixelStorei = glPixelStorei;
-    functions->fReadPixels = glReadPixels;
-    functions->fScissor = glScissor;
-#if GR_GL_USE_NEW_SHADER_SOURCE_SIGNATURE
-    functions->fShaderSource = (GrGLShaderSourceProc) glShaderSource;
-#else
-    functions->fShaderSource = glShaderSource;
-#endif
-    functions->fStencilFunc = glStencilFunc;
-    functions->fStencilFuncSeparate = glStencilFuncSeparate;
-    functions->fStencilMask = glStencilMask;
-    functions->fStencilMaskSeparate = glStencilMaskSeparate;
-    functions->fStencilOp = glStencilOp;
-    functions->fStencilOpSeparate = glStencilOpSeparate;
-    functions->fTexImage2D = glTexImage2D;
-    functions->fTexParameteri = glTexParameteri;
-    functions->fTexParameteriv = glTexParameteriv;
-    functions->fTexSubImage2D = glTexSubImage2D;
-
-    if (version >= GR_GL_VER(3,0)) {
-#if GL_ES_VERSION_3_0
-        functions->fTexStorage2D = glTexStorage2D;
-#else
-        functions->fTexStorage2D = (GrGLTexStorage2DProc) eglGetProcAddress("glTexStorage2D");
-#endif
-    } else {
-#if GL_EXT_texture_storage
-        functions->fTexStorage2D = glTexStorage2DEXT;
-#else
-        functions->fTexStorage2D = (GrGLTexStorage2DProc) eglGetProcAddress("glTexStorage2DEXT");
-#endif
-    }
-
-#if GL_EXT_discard_framebuffer
-    functions->fDiscardFramebuffer = glDiscardFramebufferEXT;
-#endif
-    functions->fUniform1f = glUniform1f;
-    functions->fUniform1i = glUniform1i;
-    functions->fUniform1fv = glUniform1fv;
-    functions->fUniform1iv = glUniform1iv;
-    functions->fUniform2f = glUniform2f;
-    functions->fUniform2i = glUniform2i;
-    functions->fUniform2fv = glUniform2fv;
-    functions->fUniform2iv = glUniform2iv;
-    functions->fUniform3f = glUniform3f;
-    functions->fUniform3i = glUniform3i;
-    functions->fUniform3fv = glUniform3fv;
-    functions->fUniform3iv = glUniform3iv;
-    functions->fUniform4f = glUniform4f;
-    functions->fUniform4i = glUniform4i;
-    functions->fUniform4fv = glUniform4fv;
-    functions->fUniform4iv = glUniform4iv;
-    functions->fUniformMatrix2fv = glUniformMatrix2fv;
-    functions->fUniformMatrix3fv = glUniformMatrix3fv;
-    functions->fUniformMatrix4fv = glUniformMatrix4fv;
-    functions->fUseProgram = glUseProgram;
-    functions->fVertexAttrib4fv = glVertexAttrib4fv;
-    functions->fVertexAttribPointer = glVertexAttribPointer;
-    functions->fViewport = glViewport;
-    functions->fBindFramebuffer = glBindFramebuffer;
-    functions->fBindRenderbuffer = glBindRenderbuffer;
-    functions->fCheckFramebufferStatus = glCheckFramebufferStatus;
-    functions->fDeleteFramebuffers = glDeleteFramebuffers;
-    functions->fDeleteRenderbuffers = glDeleteRenderbuffers;
-    functions->fFramebufferRenderbuffer = glFramebufferRenderbuffer;
-    functions->fFramebufferTexture2D = glFramebufferTexture2D;
-
-    if (version >= GR_GL_VER(3,0)) {
-#if GL_ES_VERSION_3_0
-        functions->fRenderbufferStorageMultisample = glRenderbufferStorageMultisample;
-        functions->fBlitFramebuffer = glBlitFramebuffer;
-#else
-        functions->fRenderbufferStorageMultisample = (GrGLRenderbufferStorageMultisampleProc) eglGetProcAddress("glRenderbufferStorageMultisample");
-        functions->fBlitFramebuffer = (GrGLBlitFramebufferProc) eglGetProcAddress("glBlitFramebuffer");
-#endif
-    }
-
-    if (extensions->has("GL_EXT_multisampled_render_to_texture")) {
-#if GL_EXT_multisampled_render_to_texture
-        functions->fFramebufferTexture2DMultisample = glFramebufferTexture2DMultisampleEXT;
-        functions->fRenderbufferStorageMultisampleES2EXT = glRenderbufferStorageMultisampleEXT;
-#else
-        functions->fFramebufferTexture2DMultisample = (GrGLFramebufferTexture2DMultisampleProc) eglGetProcAddress("glFramebufferTexture2DMultisampleEXT");
-        functions->fRenderbufferStorageMultisampleES2EXT = (GrGLRenderbufferStorageMultisampleProc) eglGetProcAddress("glRenderbufferStorageMultisampleEXT");
-#endif
-    } else if (extensions->has("GL_IMG_multisampled_render_to_texture")) {
-#if GL_IMG_multisampled_render_to_texture
-        functions->fFramebufferTexture2DMultisample = glFramebufferTexture2DMultisampleIMG;
-        functions->fRenderbufferStorageMultisampleES2EXT = glRenderbufferStorageMultisampleIMG;
-#else
-        functions->fFramebufferTexture2DMultisample = (GrGLFramebufferTexture2DMultisampleProc) eglGetProcAddress("glFramebufferTexture2DMultisampleIMG");
-        functions->fRenderbufferStorageMultisampleES2EXT = (GrGLRenderbufferStorageMultisampleProc) eglGetProcAddress("glRenderbufferStorageMultisampleIMG");
-#endif
-    }
-
-    functions->fGenFramebuffers = glGenFramebuffers;
-    functions->fGenRenderbuffers = glGenRenderbuffers;
-    functions->fGetFramebufferAttachmentParameteriv = glGetFramebufferAttachmentParameteriv;
-    functions->fGetRenderbufferParameteriv = glGetRenderbufferParameteriv;
-    functions->fRenderbufferStorage = glRenderbufferStorage;
-
-#if GL_OES_mapbuffer
-    functions->fMapBuffer = glMapBufferOES;
-    functions->fUnmapBuffer = glUnmapBufferOES;
-#else
-    functions->fMapBuffer = (GrGLMapBufferProc) eglGetProcAddress("glMapBufferOES");
-    functions->fUnmapBuffer = (GrGLUnmapBufferProc) eglGetProcAddress("glUnmapBufferOES");
-
-#endif
-
-    if (version >= GR_GL_VER(3,0)) {
-#if GL_ES_VERSION_3_0
-        functions->fMapBufferRange = glMapBufferRange;
-        functions->fFlushMappedBufferRange = glFlushMappedBufferRange;
-#else
-        functions->fMapBufferRange = (GrGLMapBufferRangeProc) eglGetProcAddress("glMapBufferRange");
-        functions->fFlushMappedBufferRange = (GrGLFlushMappedBufferRangeProc) eglGetProcAddress("glFlushMappedBufferRange");
-#endif
-    } else if (extensions->has("GL_EXT_map_buffer_range")) {
-#if GL_EXT_map_buffer_range
-        functions->fMapBufferRange = glMapBufferRangeEXT;
-        functions->fFlushMappedBufferRange = glFlushMappedBufferRangeEXT;
-#else
-        functions->fMapBufferRange = (GrGLMapBufferRangeProc) eglGetProcAddress("glMapBufferRangeEXT");
-        functions->fFlushMappedBufferRange = (GrGLFlushMappedBufferRangeProc) eglGetProcAddress("glFlushMappedBufferRangeEXT");
-#endif
-    }
-
-    if (extensions->has("GL_EXT_debug_marker")) {
-        functions->fInsertEventMarker = (GrGLInsertEventMarkerProc) eglGetProcAddress("glInsertEventMarker");
-        functions->fPushGroupMarker = (GrGLInsertEventMarkerProc) eglGetProcAddress("glPushGroupMarker");
-        functions->fPopGroupMarker = (GrGLPopGroupMarkerProc) eglGetProcAddress("glPopGroupMarker");
-        // The below check is here because a device has been found that has the extension string but
-        // returns NULL from the eglGetProcAddress for the functions
-        if (NULL == functions->fInsertEventMarker ||
-            NULL == functions->fPushGroupMarker ||
-            NULL == functions->fPopGroupMarker) {
-            extensions->remove("GL_EXT_debug_marker");
-        }
-    }
-
-#if GL_ES_VERSION_3_0
-    functions->fInvalidateFramebuffer = glInvalidateFramebuffer;
-    functions->fInvalidateSubFramebuffer = glInvalidateSubFramebuffer;
-#else
-    functions->fInvalidateFramebuffer = (GrGLInvalidateFramebufferProc) eglGetProcAddress("glInvalidateFramebuffer");
-    functions->fInvalidateSubFramebuffer = (GrGLInvalidateSubFramebufferProc) eglGetProcAddress("glInvalidateSubFramebuffer");
-#endif
-    functions->fInvalidateBufferData = (GrGLInvalidateBufferDataProc) eglGetProcAddress("glInvalidateBufferData");
-    functions->fInvalidateBufferSubData = (GrGLInvalidateBufferSubDataProc) eglGetProcAddress("glInvalidateBufferSubData");
-    functions->fInvalidateTexImage = (GrGLInvalidateTexImageProc) eglGetProcAddress("glInvalidateTexImage");
-    functions->fInvalidateTexSubImage = (GrGLInvalidateTexSubImageProc) eglGetProcAddress("glInvalidateTexSubImage");
-
-    return interface;
-}
+#include "gl/GrGLAssembleGLESInterface.h"
 
 static GrGLFuncPtr android_get_gl_proc(void* ctx, const char name[]) {
     SkASSERT(NULL == ctx);
     return eglGetProcAddress(name);
 }
 
-static const GrGLInterface* create_desktop_interface() {
-    return GrGLAssembleGLInterface(NULL, android_get_gl_proc);
-}
-
 const GrGLInterface* GrGLCreateNativeInterface() {
 
     const char* verStr = reinterpret_cast<const char*>(glGetString(GR_GL_VERSION));
     GrGLStandard standard = GrGLGetStandardInUseFromString(verStr);
 
     if (kGLES_GrGLStandard == standard) {
-        GrGLVersion version = GrGLGetVersionFromString(verStr);
-        GrGLExtensions extensions;
-        GrGLGetStringiProc getStringi = (GrGLGetStringiProc) eglGetProcAddress("glGetStringi");
-        if (!extensions.init(standard, glGetString, getStringi, glGetIntegerv)) {
-            return NULL;
-        }
-        GrGLInterface* interface = create_es_interface(version, &extensions);
-
-        if (NULL != interface) {
-            interface->fExtensions.swap(&extensions);
-        }
-
-        return interface;
+        return GrGLAssembleGLESInterface(NULL, android_get_gl_proc);
     } else if (kGL_GrGLStandard == standard) {
-        return create_desktop_interface();
+        return GrGLAssembleGLInterface(NULL, android_get_gl_proc);
     }
 
     return NULL;
 }