1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9
10 #include "gl/GrGLInterface.h"
11 #define WIN32_LEAN_AND_MEAN
12 #include <Windows.h>
13 #include <GL/GL.h>
14
15 /*
16 * Windows makes the GL funcs all be __stdcall instead of __cdecl :(
17 * This implementation will only work if GR_GL_FUNCTION_TYPE is __stdcall.
18 * Otherwise, a springboard would be needed that hides the calling convention.
19 */
20
21 #define GR_GL_GET_PROC(F) interface->f ## F = (GrGL ## F ## Proc) wglGetProcAddress("gl" #F);
22 #define GR_GL_GET_PROC_SUFFIX(F, S) interface->f ## F = (GrGL ## F ## Proc) wglGetProcAddress("gl" #F #S);
23
GrGLCreateNativeInterface()24 const GrGLInterface* GrGLCreateNativeInterface() {
25 // wglGetProcAddress requires a context.
26 // GL Function pointers retrieved in one context may not be valid in another
27 // context. For that reason we create a new GrGLInterface each time we're
28 // called.
29 if (NULL != wglGetCurrentContext()) {
30 const char* versionString = (const char*) glGetString(GL_VERSION);
31 const char* extString = (const char*) glGetString(GL_EXTENSIONS);
32 GrGLVersion glVer = GrGLGetVersionFromString(versionString);
33
34 if (glVer < GR_GL_VER(1,5)) {
35 // We must have array and element_array buffer objects.
36 return NULL;
37 }
38 GrGLInterface* interface = new GrGLInterface();
39
40 // Functions that are part of GL 1.1 will return NULL in
41 // wglGetProcAddress
42 interface->fBindTexture = glBindTexture;
43 interface->fBlendFunc = glBlendFunc;
44 interface->fClear = glClear;
45 interface->fClearColor = glClearColor;
46 interface->fClearStencil = glClearStencil;
47 interface->fColorMask = glColorMask;
48 interface->fColorPointer = glColorPointer;
49 interface->fCullFace = glCullFace;
50 interface->fDeleteTextures = glDeleteTextures;
51 interface->fDepthMask = glDepthMask;
52 interface->fDisable = glDisable;
53 interface->fDrawArrays = glDrawArrays;
54 interface->fDrawElements = glDrawElements;
55 interface->fDrawBuffer = glDrawBuffer;
56 interface->fEnable = glEnable;
57 interface->fFrontFace = glFrontFace;
58 interface->fFinish = glFinish;
59 interface->fFlush = glFlush;
60 interface->fGenTextures = glGenTextures;
61 interface->fGetError = glGetError;
62 interface->fGetIntegerv = glGetIntegerv;
63 interface->fGetString = glGetString;
64 interface->fGetTexLevelParameteriv = glGetTexLevelParameteriv;
65 interface->fLineWidth = glLineWidth;
66 interface->fPixelStorei = glPixelStorei;
67 interface->fReadBuffer = glReadBuffer;
68 interface->fReadPixels = glReadPixels;
69 interface->fScissor = glScissor;
70 interface->fStencilFunc = glStencilFunc;
71 interface->fStencilMask = glStencilMask;
72 interface->fStencilOp = glStencilOp;
73 interface->fTexImage2D = glTexImage2D;
74 interface->fTexParameteri = glTexParameteri;
75 if (glVer >= GR_GL_VER(4,2) ||
76 GrGLHasExtensionFromString("GL_ARB_texture_storage", extString)) {
77 GR_GL_GET_PROC(TexStorage2D);
78 } else if (GrGLHasExtensionFromString("GL_EXT_texture_storage", extString)) {
79 GR_GL_GET_PROC_SUFFIX(TexStorage2D, EXT);
80 }
81 interface->fTexSubImage2D = glTexSubImage2D;
82 interface->fViewport = glViewport;
83
84 GR_GL_GET_PROC(ActiveTexture);
85 GR_GL_GET_PROC(AttachShader);
86 GR_GL_GET_PROC(BeginQuery);
87 GR_GL_GET_PROC(BindAttribLocation);
88 GR_GL_GET_PROC(BindBuffer);
89 GR_GL_GET_PROC(BindFragDataLocation);
90 GR_GL_GET_PROC(BlendColor);
91 GR_GL_GET_PROC(BufferData);
92 GR_GL_GET_PROC(BufferSubData);
93 GR_GL_GET_PROC(CompileShader);
94 GR_GL_GET_PROC(CompressedTexImage2D);
95 GR_GL_GET_PROC(CreateProgram);
96 GR_GL_GET_PROC(CreateShader);
97 GR_GL_GET_PROC(DeleteBuffers);
98 GR_GL_GET_PROC(DeleteQueries);
99 GR_GL_GET_PROC(DeleteProgram);
100 GR_GL_GET_PROC(DeleteShader);
101 GR_GL_GET_PROC(DisableVertexAttribArray);
102 GR_GL_GET_PROC(DrawBuffers);
103 GR_GL_GET_PROC(EnableVertexAttribArray);
104 GR_GL_GET_PROC(EndQuery);
105 GR_GL_GET_PROC(GenBuffers);
106 GR_GL_GET_PROC(GenQueries);
107 GR_GL_GET_PROC(GetBufferParameteriv);
108 GR_GL_GET_PROC(GetQueryiv);
109 GR_GL_GET_PROC(GetQueryObjectiv);
110 GR_GL_GET_PROC(GetQueryObjectuiv);
111 if (glVer > GR_GL_VER(3,3) ||
112 GrGLHasExtensionFromString("GL_ARB_timer_query", extString)) {
113 GR_GL_GET_PROC(GetQueryObjecti64v);
114 GR_GL_GET_PROC(GetQueryObjectui64v);
115 GR_GL_GET_PROC(QueryCounter);
116 } else if (GrGLHasExtensionFromString("GL_EXT_timer_query", extString)) {
117 GR_GL_GET_PROC_SUFFIX(GetQueryObjecti64v, EXT);
118 GR_GL_GET_PROC_SUFFIX(GetQueryObjectui64v, EXT);
119 }
120 GR_GL_GET_PROC(GetProgramInfoLog);
121 GR_GL_GET_PROC(GetProgramiv);
122 GR_GL_GET_PROC(GetShaderInfoLog);
123 GR_GL_GET_PROC(GetShaderiv);
124 GR_GL_GET_PROC(GetUniformLocation);
125 GR_GL_GET_PROC(LinkProgram);
126 GR_GL_GET_PROC(ShaderSource);
127 GR_GL_GET_PROC(StencilFuncSeparate);
128 GR_GL_GET_PROC(StencilMaskSeparate);
129 GR_GL_GET_PROC(StencilOpSeparate);
130 GR_GL_GET_PROC(Uniform1f);
131 GR_GL_GET_PROC(Uniform1i);
132 GR_GL_GET_PROC(Uniform1fv);
133 GR_GL_GET_PROC(Uniform1iv);
134 GR_GL_GET_PROC(Uniform2f);
135 GR_GL_GET_PROC(Uniform2i);
136 GR_GL_GET_PROC(Uniform2fv);
137 GR_GL_GET_PROC(Uniform2iv);
138 GR_GL_GET_PROC(Uniform3f);
139 GR_GL_GET_PROC(Uniform3i);
140 GR_GL_GET_PROC(Uniform3fv);
141 GR_GL_GET_PROC(Uniform3iv);
142 GR_GL_GET_PROC(Uniform4f);
143 GR_GL_GET_PROC(Uniform4i);
144 GR_GL_GET_PROC(Uniform4fv);
145 GR_GL_GET_PROC(Uniform4iv);
146 GR_GL_GET_PROC(UniformMatrix2fv);
147 GR_GL_GET_PROC(UniformMatrix3fv);
148 GR_GL_GET_PROC(UniformMatrix4fv);
149 GR_GL_GET_PROC(UseProgram);
150 GR_GL_GET_PROC(VertexAttrib4fv);
151 GR_GL_GET_PROC(VertexAttribPointer);
152 GR_GL_GET_PROC(BindFragDataLocationIndexed);
153
154 // First look for GL3.0 FBO or GL_ARB_framebuffer_object (same since
155 // GL_ARB_framebuffer_object doesn't use ARB suffix.)
156 if (glVer > GR_GL_VER(3,0) ||
157 GrGLHasExtensionFromString("GL_ARB_framebuffer_object", extString)) {
158 GR_GL_GET_PROC(GenFramebuffers);
159 GR_GL_GET_PROC(GetFramebufferAttachmentParameteriv);
160 GR_GL_GET_PROC(GetRenderbufferParameteriv);
161 GR_GL_GET_PROC(BindFramebuffer);
162 GR_GL_GET_PROC(FramebufferTexture2D);
163 GR_GL_GET_PROC(CheckFramebufferStatus);
164 GR_GL_GET_PROC(DeleteFramebuffers);
165 GR_GL_GET_PROC(RenderbufferStorage);
166 GR_GL_GET_PROC(GenRenderbuffers);
167 GR_GL_GET_PROC(DeleteRenderbuffers);
168 GR_GL_GET_PROC(FramebufferRenderbuffer);
169 GR_GL_GET_PROC(BindRenderbuffer);
170 GR_GL_GET_PROC(RenderbufferStorageMultisample);
171 GR_GL_GET_PROC(BlitFramebuffer);
172 } else if (GrGLHasExtensionFromString("GL_EXT_framebuffer_object",
173 extString)) {
174 GR_GL_GET_PROC_SUFFIX(GenFramebuffers, EXT);
175 GR_GL_GET_PROC_SUFFIX(GetFramebufferAttachmentParameteriv, EXT);
176 GR_GL_GET_PROC_SUFFIX(GetRenderbufferParameteriv, EXT);
177 GR_GL_GET_PROC_SUFFIX(BindFramebuffer, EXT);
178 GR_GL_GET_PROC_SUFFIX(FramebufferTexture2D, EXT);
179 GR_GL_GET_PROC_SUFFIX(CheckFramebufferStatus, EXT);
180 GR_GL_GET_PROC_SUFFIX(DeleteFramebuffers, EXT);
181 GR_GL_GET_PROC_SUFFIX(RenderbufferStorage, EXT);
182 GR_GL_GET_PROC_SUFFIX(GenRenderbuffers, EXT);
183 GR_GL_GET_PROC_SUFFIX(DeleteRenderbuffers, EXT);
184 GR_GL_GET_PROC_SUFFIX(FramebufferRenderbuffer, EXT);
185 GR_GL_GET_PROC_SUFFIX(BindRenderbuffer, EXT);
186 if (GrGLHasExtensionFromString("GL_EXT_framebuffer_multisample", extString)) {
187 GR_GL_GET_PROC_SUFFIX(RenderbufferStorageMultisample, EXT);
188 }
189 if (GrGLHasExtensionFromString("GL_EXT_framebuffer_blit", extString)) {
190 GR_GL_GET_PROC_SUFFIX(BlitFramebuffer, EXT);
191 }
192 } else {
193 // we must have FBOs
194 delete interface;
195 return NULL;
196 }
197 GR_GL_GET_PROC(MapBuffer);
198 GR_GL_GET_PROC(UnmapBuffer);
199
200 interface->fBindingsExported = kDesktop_GrGLBinding;
201
202 return interface;
203 } else {
204 return NULL;
205 }
206 }
207