michael@0: 
michael@0: /*
michael@0:  * Copyright 2011 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "gl/GrGLExtensions.h"
michael@0: #include "gl/GrGLInterface.h"
michael@0: #include "../GrGLUtil.h"
michael@0: 
michael@0: #define GL_GLEXT_PROTOTYPES
michael@0: #include "osmesa_wrapper.h"
michael@0: 
michael@0: #define GR_GL_GET_PROC(F) interface->fFunctions.f ## F = (GrGL ## F ## Proc) \
michael@0:         OSMesaGetProcAddress("gl" #F);
michael@0: #define GR_GL_GET_PROC_SUFFIX(F, S) interface->fFunctions.f ## F = (GrGL ## F ## Proc) \
michael@0:         OSMesaGetProcAddress("gl" #F #S);
michael@0: 
michael@0: // We use OSMesaGetProcAddress for every gl function to avoid accidentally using
michael@0: // non-Mesa gl functions.
michael@0: 
michael@0: const GrGLInterface* GrGLCreateMesaInterface() {
michael@0:     if (NULL != OSMesaGetCurrentContext()) {
michael@0: 
michael@0:         GrGLGetStringProc getString = (GrGLGetStringProc) OSMesaGetProcAddress("glGetString");
michael@0:         GrGLGetStringiProc getStringi = (GrGLGetStringiProc) OSMesaGetProcAddress("glGetStringi");
michael@0:         GrGLGetIntegervProc getIntegerv =
michael@0:             (GrGLGetIntegervProc) OSMesaGetProcAddress("glGetIntegerv");
michael@0: 
michael@0:         GrGLExtensions extensions;
michael@0:         if (!extensions.init(kGL_GrGLStandard, getString, getStringi, getIntegerv)) {
michael@0:             return NULL;
michael@0:         }
michael@0: 
michael@0:         const char* versionString = (const char*) getString(GL_VERSION);
michael@0:         GrGLVersion glVer = GrGLGetVersionFromString(versionString);
michael@0: 
michael@0:         if (glVer < GR_GL_VER(1,5)) {
michael@0:             // We must have array and element_array buffer objects.
michael@0:             return NULL;
michael@0:         }
michael@0:         GrGLInterface* interface = SkNEW(GrGLInterface());
michael@0: 
michael@0:         GR_GL_GET_PROC(ActiveTexture);
michael@0:         GR_GL_GET_PROC(BeginQuery);
michael@0:         GR_GL_GET_PROC(AttachShader);
michael@0:         GR_GL_GET_PROC(BindAttribLocation);
michael@0:         GR_GL_GET_PROC(BindBuffer);
michael@0:         GR_GL_GET_PROC(BindFragDataLocation);
michael@0:         GR_GL_GET_PROC(BindTexture);
michael@0:         GR_GL_GET_PROC(BlendFunc);
michael@0: 
michael@0:         if (glVer >= GR_GL_VER(1,4) ||
michael@0:             extensions.has("GL_ARB_imaging") ||
michael@0:             extensions.has("GL_EXT_blend_color")) {
michael@0:             GR_GL_GET_PROC(BlendColor);
michael@0:         }
michael@0: 
michael@0:         GR_GL_GET_PROC(BufferData);
michael@0:         GR_GL_GET_PROC(BufferSubData);
michael@0:         GR_GL_GET_PROC(Clear);
michael@0:         GR_GL_GET_PROC(ClearColor);
michael@0:         GR_GL_GET_PROC(ClearStencil);
michael@0:         GR_GL_GET_PROC(ColorMask);
michael@0:         GR_GL_GET_PROC(CompileShader);
michael@0:         GR_GL_GET_PROC(CompressedTexImage2D);
michael@0:         GR_GL_GET_PROC(CopyTexSubImage2D);
michael@0:         GR_GL_GET_PROC(CreateProgram);
michael@0:         GR_GL_GET_PROC(CreateShader);
michael@0:         GR_GL_GET_PROC(CullFace);
michael@0:         GR_GL_GET_PROC(DeleteBuffers);
michael@0:         GR_GL_GET_PROC(DeleteProgram);
michael@0:         GR_GL_GET_PROC(DeleteQueries);
michael@0:         GR_GL_GET_PROC(DeleteShader);
michael@0:         GR_GL_GET_PROC(DeleteTextures);
michael@0:         GR_GL_GET_PROC(DepthMask);
michael@0:         GR_GL_GET_PROC(Disable);
michael@0:         GR_GL_GET_PROC(DisableVertexAttribArray);
michael@0:         GR_GL_GET_PROC(DrawArrays);
michael@0:         GR_GL_GET_PROC(DrawBuffer);
michael@0:         GR_GL_GET_PROC(DrawBuffers);
michael@0:         GR_GL_GET_PROC(DrawElements);
michael@0:         GR_GL_GET_PROC(Enable);
michael@0:         GR_GL_GET_PROC(EnableVertexAttribArray);
michael@0:         GR_GL_GET_PROC(EndQuery);
michael@0:         GR_GL_GET_PROC(Finish);
michael@0:         GR_GL_GET_PROC(Flush);
michael@0:         GR_GL_GET_PROC(FrontFace);
michael@0:         GR_GL_GET_PROC(GenBuffers);
michael@0:         GR_GL_GET_PROC(GenerateMipmap);
michael@0:         GR_GL_GET_PROC(GenQueries);
michael@0:         GR_GL_GET_PROC(GetBufferParameteriv);
michael@0:         GR_GL_GET_PROC(GetError);
michael@0:         GR_GL_GET_PROC(GetIntegerv);
michael@0:         GR_GL_GET_PROC(GetProgramInfoLog);
michael@0:         GR_GL_GET_PROC(GetProgramiv);
michael@0:         if (glVer >= GR_GL_VER(3,3) || extensions.has("GL_ARB_timer_query")) {
michael@0:             GR_GL_GET_PROC(GetQueryObjecti64v);
michael@0:             GR_GL_GET_PROC(GetQueryObjectui64v)
michael@0:             GR_GL_GET_PROC(QueryCounter);
michael@0:         } else if (extensions.has("GL_EXT_timer_query")) {
michael@0:             GR_GL_GET_PROC_SUFFIX(GetQueryObjecti64v, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(GetQueryObjectui64v, EXT);
michael@0:         }
michael@0:         GR_GL_GET_PROC(GetQueryObjectiv);
michael@0:         GR_GL_GET_PROC(GetQueryObjectuiv);
michael@0:         GR_GL_GET_PROC(GetQueryiv);
michael@0:         GR_GL_GET_PROC(GetShaderInfoLog);
michael@0:         GR_GL_GET_PROC(GetShaderiv);
michael@0:         GR_GL_GET_PROC(GetString);
michael@0:         GR_GL_GET_PROC(GetStringi);
michael@0:         GR_GL_GET_PROC(GetTexLevelParameteriv);
michael@0:         GR_GL_GET_PROC(GenTextures);
michael@0:         GR_GL_GET_PROC(GetUniformLocation);
michael@0:         GR_GL_GET_PROC(LineWidth);
michael@0:         GR_GL_GET_PROC(LinkProgram);
michael@0:         GR_GL_GET_PROC(LoadIdentity);
michael@0:         GR_GL_GET_PROC(LoadMatrixf);
michael@0:         GR_GL_GET_PROC(MatrixMode);
michael@0:         GR_GL_GET_PROC(MapBuffer);
michael@0:         GR_GL_GET_PROC(PixelStorei);
michael@0:         GR_GL_GET_PROC(ReadBuffer);
michael@0:         GR_GL_GET_PROC(ReadPixels);
michael@0:         GR_GL_GET_PROC(Scissor);
michael@0:         GR_GL_GET_PROC(ShaderSource);
michael@0:         GR_GL_GET_PROC(StencilFunc);
michael@0:         GR_GL_GET_PROC(StencilFuncSeparate);
michael@0:         GR_GL_GET_PROC(StencilMask);
michael@0:         GR_GL_GET_PROC(StencilMaskSeparate);
michael@0:         GR_GL_GET_PROC(StencilOp);
michael@0:         GR_GL_GET_PROC(StencilOpSeparate);
michael@0:         GR_GL_GET_PROC(TexGenfv);
michael@0:         GR_GL_GET_PROC(TexGeni);
michael@0:         GR_GL_GET_PROC(TexImage2D)
michael@0:         GR_GL_GET_PROC(TexParameteri);
michael@0:         GR_GL_GET_PROC(TexParameteriv);
michael@0:         GR_GL_GET_PROC(TexStorage2D);
michael@0:         if (NULL == interface->fFunctions.fTexStorage2D) {
michael@0:             GR_GL_GET_PROC_SUFFIX(TexStorage2D, EXT);
michael@0:         }
michael@0:         GR_GL_GET_PROC(TexSubImage2D);
michael@0:         GR_GL_GET_PROC(Uniform1f);
michael@0:         GR_GL_GET_PROC(Uniform1i);
michael@0:         GR_GL_GET_PROC(Uniform1fv);
michael@0:         GR_GL_GET_PROC(Uniform1iv);
michael@0:         GR_GL_GET_PROC(Uniform2f);
michael@0:         GR_GL_GET_PROC(Uniform2i);
michael@0:         GR_GL_GET_PROC(Uniform2fv);
michael@0:         GR_GL_GET_PROC(Uniform2iv);
michael@0:         GR_GL_GET_PROC(Uniform3f);
michael@0:         GR_GL_GET_PROC(Uniform3i);
michael@0:         GR_GL_GET_PROC(Uniform3fv);
michael@0:         GR_GL_GET_PROC(Uniform3iv);
michael@0:         GR_GL_GET_PROC(Uniform4f);
michael@0:         GR_GL_GET_PROC(Uniform4i);
michael@0:         GR_GL_GET_PROC(Uniform4fv);
michael@0:         GR_GL_GET_PROC(Uniform4iv);
michael@0:         GR_GL_GET_PROC(UniformMatrix2fv);
michael@0:         GR_GL_GET_PROC(UniformMatrix3fv);
michael@0:         GR_GL_GET_PROC(UniformMatrix4fv);
michael@0:         GR_GL_GET_PROC(UnmapBuffer);
michael@0:         GR_GL_GET_PROC(UseProgram);
michael@0:         GR_GL_GET_PROC(VertexAttrib4fv);
michael@0:         GR_GL_GET_PROC(VertexAttribPointer);
michael@0:         GR_GL_GET_PROC(Viewport);
michael@0: 
michael@0:         if (glVer >= GR_GL_VER(3,0) || extensions.has("GL_ARB_vertex_array_object")) {
michael@0:             // no ARB suffix for GL_ARB_vertex_array_object
michael@0:             GR_GL_GET_PROC(BindVertexArray);
michael@0:             GR_GL_GET_PROC(DeleteVertexArrays);
michael@0:             GR_GL_GET_PROC(GenVertexArrays);
michael@0:         }
michael@0: 
michael@0:         // First look for GL3.0 FBO or GL_ARB_framebuffer_object (same since
michael@0:         // GL_ARB_framebuffer_object doesn't use ARB suffix.)
michael@0:         if (glVer >= GR_GL_VER(3,0) || extensions.has("GL_ARB_framebuffer_object")) {
michael@0:             GR_GL_GET_PROC(GenFramebuffers);
michael@0:             GR_GL_GET_PROC(GetFramebufferAttachmentParameteriv);
michael@0:             GR_GL_GET_PROC(GetRenderbufferParameteriv);
michael@0:             GR_GL_GET_PROC(BindFramebuffer);
michael@0:             GR_GL_GET_PROC(FramebufferTexture2D);
michael@0:             GR_GL_GET_PROC(CheckFramebufferStatus);
michael@0:             GR_GL_GET_PROC(DeleteFramebuffers);
michael@0:             GR_GL_GET_PROC(RenderbufferStorage);
michael@0:             GR_GL_GET_PROC(GenRenderbuffers);
michael@0:             GR_GL_GET_PROC(DeleteRenderbuffers);
michael@0:             GR_GL_GET_PROC(FramebufferRenderbuffer);
michael@0:             GR_GL_GET_PROC(BindRenderbuffer);
michael@0:             GR_GL_GET_PROC(RenderbufferStorageMultisample);
michael@0:             GR_GL_GET_PROC(BlitFramebuffer);
michael@0:         } else if (extensions.has("GL_EXT_framebuffer_object")) {
michael@0:             GR_GL_GET_PROC_SUFFIX(GenFramebuffers, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(GetFramebufferAttachmentParameteriv, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(GetRenderbufferParameteriv, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(BindFramebuffer, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(FramebufferTexture2D, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(CheckFramebufferStatus, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(DeleteFramebuffers, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(RenderbufferStorage, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(GenRenderbuffers, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(DeleteRenderbuffers, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(FramebufferRenderbuffer, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(BindRenderbuffer, EXT);
michael@0:             if (extensions.has("GL_EXT_framebuffer_multisample")) {
michael@0:                 GR_GL_GET_PROC_SUFFIX(RenderbufferStorageMultisample, EXT);
michael@0:             }
michael@0:             if (extensions.has("GL_EXT_framebuffer_blit")) {
michael@0:                 GR_GL_GET_PROC_SUFFIX(BlitFramebuffer, EXT);
michael@0:             }
michael@0:         } else {
michael@0:             // we must have FBOs
michael@0:             delete interface;
michael@0:             return NULL;
michael@0:         }
michael@0:         GR_GL_GET_PROC(BindFragDataLocationIndexed);
michael@0: 
michael@0:         if (extensions.has("GL_EXT_debug_marker")) {
michael@0:             GR_GL_GET_PROC_SUFFIX(InsertEventMarker, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(PopGroupMarker, EXT);
michael@0:             GR_GL_GET_PROC_SUFFIX(PushGroupMarker, EXT);
michael@0:         }
michael@0: 
michael@0:         interface->fStandard = kGL_GrGLStandard;
michael@0:         interface->fExtensions.swap(&extensions);
michael@0: 
michael@0:         return interface;
michael@0:     } else {
michael@0:         return NULL;
michael@0:     }
michael@0: }