glthunk.c (2759B)
1 /* 2 * File: glthunk.c 3 * Purpose: cdecl thunk wrapper library for Win32 stdcall OpenGL library 4 * 5 * Copyright (c) Jon TURNEY 2009,2013 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a 8 * copy of this software and associated documentation files (the "Software"), 9 * to deal in the Software without restriction, including without limitation 10 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 11 * and/or sell copies of the Software, and to permit persons to whom the 12 * Software is furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 23 * DEALINGS IN THE SOFTWARE. 24 */ 25 26 // define USE_OPENGL32 makes gl.h declare gl*() function prototypes with stdcall linkage, 27 // so our generated wrappers will correctly link with the functions in opengl32.dll 28 #define USE_OPENGL32 29 30 #ifdef HAVE_XWIN_CONFIG_H 31 #include <xwin-config.h> 32 #endif 33 34 #include <X11/Xwindows.h> 35 36 #define GL_GLEXT_LEGACY 37 #include <GL/gl.h> 38 #undef GL_ARB_imaging 39 #undef GL_VERSION_1_3 40 #include <GL/glext.h> 41 42 static PROC 43 glWinResolveHelper(PROC * cache, const char *symbol) 44 { 45 PROC proc = NULL; 46 47 /* If not yet cached, call wglGetProcAddress */ 48 if ((*cache) == NULL) { 49 proc = wglGetProcAddress(symbol); 50 if (proc == NULL) { 51 (*cache) = (PROC) - 1; 52 } 53 else { 54 (*cache) = proc; 55 } 56 } 57 /* Cached wglGetProcAddress failure */ 58 else if ((*cache) == (PROC) - 1) { 59 proc = 0; 60 } 61 /* Cached wglGetProcAddress result */ 62 else { 63 proc = (*cache); 64 } 65 66 return proc; 67 } 68 69 #define RESOLVE_RET(proctype, symbol, retval) \ 70 static PROC cache = NULL; \ 71 __stdcall proctype proc = (proctype)glWinResolveHelper(&cache, symbol); \ 72 if (proc == NULL) { \ 73 return retval; \ 74 } 75 76 #define RESOLVE(proctype, symbol) RESOLVE_RET(proctype, symbol,) 77 78 #define RESOLVED_PROC(proctype) proc 79 80 /* 81 Include generated cdecl wrappers for stdcall gl*() functions in opengl32.dll 82 83 OpenGL 1.2 and upward is treated as extensions, function address must 84 found using wglGetProcAddress(), but also stdcall so still need wrappers... 85 */ 86 87 #include "generated_gl_thunks.ic"