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
glWinResolveHelper(PROC * cache,const char * symbol)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"
88