1 /* 2 * Copyright 2011 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 #include "SkTypes.h" 8 #if defined(SK_BUILD_FOR_WIN32) 9 10 #include "SkLeanWindows.h" 11 12 #include "gl/GrGLInterface.h" 13 #include "gl/GrGLAssembleInterface.h" 14 #include "gl/GrGLUtil.h" 15 16 class AutoLibraryUnload { 17 public: AutoLibraryUnload(const char * moduleName)18 AutoLibraryUnload(const char* moduleName) { 19 fModule = LoadLibraryA(moduleName); 20 } ~AutoLibraryUnload()21 ~AutoLibraryUnload() { 22 if (fModule) { 23 FreeLibrary(fModule); 24 } 25 } get() const26 HMODULE get() const { return fModule; } 27 28 private: 29 HMODULE fModule; 30 }; 31 32 class GLProcGetter { 33 public: GLProcGetter()34 GLProcGetter() : fGLLib("opengl32.dll") {} 35 isInitialized() const36 bool isInitialized() const { return SkToBool(fGLLib.get()); } 37 getProc(const char name[]) const38 GrGLFuncPtr getProc(const char name[]) const { 39 GrGLFuncPtr proc; 40 if ((proc = (GrGLFuncPtr) GetProcAddress(fGLLib.get(), name))) { 41 return proc; 42 } 43 if ((proc = (GrGLFuncPtr) wglGetProcAddress(name))) { 44 return proc; 45 } 46 return nullptr; 47 } 48 49 private: 50 AutoLibraryUnload fGLLib; 51 }; 52 win_get_gl_proc(void * ctx,const char name[])53static GrGLFuncPtr win_get_gl_proc(void* ctx, const char name[]) { 54 SkASSERT(ctx); 55 SkASSERT(wglGetCurrentContext()); 56 const GLProcGetter* getter = (const GLProcGetter*) ctx; 57 return getter->getProc(name); 58 } 59 60 /* 61 * Windows makes the GL funcs all be __stdcall instead of __cdecl :( 62 * This implementation will only work if GR_GL_FUNCTION_TYPE is __stdcall. 63 * Otherwise, a springboard would be needed that hides the calling convention. 64 */ GrGLCreateNativeInterface()65const GrGLInterface* GrGLCreateNativeInterface() { 66 if (nullptr == wglGetCurrentContext()) { 67 return nullptr; 68 } 69 70 GLProcGetter getter; 71 if (!getter.isInitialized()) { 72 return nullptr; 73 } 74 75 GrGLGetStringProc getString = (GrGLGetStringProc)getter.getProc("glGetString"); 76 if (nullptr == getString) { 77 return nullptr; 78 } 79 const char* verStr = reinterpret_cast<const char*>(getString(GR_GL_VERSION)); 80 GrGLStandard standard = GrGLGetStandardInUseFromString(verStr); 81 82 if (kGLES_GrGLStandard == standard) { 83 return GrGLAssembleGLESInterface(&getter, win_get_gl_proc); 84 } else if (kGL_GrGLStandard == standard) { 85 return GrGLAssembleGLInterface(&getter, win_get_gl_proc); 86 } 87 return nullptr; 88 } 89 90 #endif//defined(SK_BUILD_FOR_WIN32) 91