88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/*
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* File: glthunk.c
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* Purpose: cdecl thunk wrapper library for Win32 stdcall OpenGL library
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*
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* Copyright (c) Jon TURNEY 2009,2013
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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// define USE_OPENGL32 makes gl.h declare gl*() function prototypes with stdcall linkage,
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// so our generated wrappers will correctly link with the functions in opengl32.dll
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#define USE_OPENGL32
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#ifdef HAVE_XWIN_CONFIG_H
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#include <xwin-config.h>
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#endif
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#include <X11/Xwindows.h>
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#define GL_GLEXT_LEGACY
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#include <GL/gl.h>
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#undef GL_ARB_imaging
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#undef GL_VERSION_1_3
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#include <GL/glext.h>
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static PROC
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glWinResolveHelper(PROC * cache, const char *symbol)
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{
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PROC proc = NULL;
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/* If not yet cached, call wglGetProcAddress */
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if ((*cache) == NULL) {
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proc = wglGetProcAddress(symbol);
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if (proc == NULL) {
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(*cache) = (PROC) - 1;
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}
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else {
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(*cache) = proc;
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}
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}
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/* Cached wglGetProcAddress failure */
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else if ((*cache) == (PROC) - 1) {
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proc = 0;
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}
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/* Cached wglGetProcAddress result */
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else {
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proc = (*cache);
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}
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return proc;
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}
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#define RESOLVE_RET(proctype, symbol, retval) \
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static PROC cache = NULL; \
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__stdcall proctype proc = (proctype)glWinResolveHelper(&cache, symbol); \
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if (proc == NULL) { \
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return retval; \
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}
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#define RESOLVE(proctype, symbol) RESOLVE_RET(proctype, symbol,)
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#define RESOLVED_PROC(proctype) proc
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/*
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Include generated cdecl wrappers for stdcall gl*() functions in opengl32.dll
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OpenGL 1.2 and upward is treated as extensions, function address must
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found using wglGetProcAddress(), but also stdcall so still need wrappers...
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*/
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#include "generated_gl_thunks.c"
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