/* $Id: glxapi.c,v 1.19 2000/12/14 17:44:08 brianp Exp $ */ /* * Mesa 3-D graphics library * Version: 3.5 * * Copyright (C) 1999-2000 Brian Paul All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /* * This is the GLX API dispatcher. Calls to the glX* functions are * either routed to real (SGI / Utah) GLX encoders or to Mesa's * pseudo-GLX module. */ #include #include #include #include "glapi.h" #include "glxapi.h" /* * XXX - this really shouldn't be here. * Instead, add -DUSE_MESA_GLX to the compiler flags when needed. */ #define USE_MESA_GLX 1 /* Rather than include possibly non-existant headers... */ #ifdef USE_SGI_GLX extern struct _glxapi_table *_sgi_GetGLXDispatchtable(void); #endif #ifdef USE_UTAH_GLX extern struct _glxapi_table *_utah_GetGLXDispatchTable(void); #endif #ifdef USE_MESA_GLX extern struct _glxapi_table *_mesa_GetGLXDispatchTable(void); #endif struct display_dispatch { Display *Dpy; struct _glxapi_table *Table; struct display_dispatch *Next; }; static struct display_dispatch *DispatchList = NULL; static struct _glxapi_table * get_dispatch(Display *dpy) { static Display *prevDisplay = NULL; static struct _glxapi_table *prevTable = NULL; if (!dpy) return NULL; /* try cached display */ if (dpy == prevDisplay) { return prevTable; } /* search list of display/dispatch pairs for this display */ { const struct display_dispatch *d = DispatchList; while (d) { if (d->Dpy == dpy) { prevDisplay = dpy; prevTable = d->Table; return d->Table; /* done! */ } d = d->Next; } } /* A new display, determine if we should use real GLX (SGI / Utah) * or Mesa's pseudo-GLX. */ { struct _glxapi_table *t = NULL; #if defined(USE_SGI_GLX) || defined(USE_UTAH_GLX) if (!getenv("MESA_FORCE_SOFTX")) { int ignore; if (XQueryExtension( dpy, "GLX", &ignore, &ignore, &ignore )) { /* the X server has the GLX extension */ #if defined(USE_SGI_GLX) t = _sgi_GetGLXDispatchtable(); #elif defined(USE_UTAH_GLX) t = _utah_GetGLXDispatchTable(); #endif } } #endif #if defined(USE_MESA_GLX) if (!t) { t = _mesa_GetGLXDispatchTable(); assert(t); /* this has to work */ } #endif if (t) { struct display_dispatch *d; d = (struct display_dispatch *) malloc(sizeof(struct display_dispatch)); if (d) { d->Dpy = dpy; d->Table = t; /* insert at head of list */ d->Next = DispatchList; DispatchList = d; /* update cache */ prevDisplay = dpy; prevTable = t; return t; } } } /* If we get here that means we can't use real GLX on this display * and the Mesa pseudo-GLX software renderer wasn't compiled in. * Or, we ran out of memory! */ return NULL; } /* Set by glXMakeCurrent() and glXMakeContextCurrent() only */ static Display *CurrentDisplay = NULL; static GLXContext CurrentContext = 0; static GLXDrawable CurrentDrawable = 0; static GLXDrawable CurrentReadDrawable = 0; /* * GLX API entrypoints */ XVisualInfo *glXChooseVisual(Display *dpy, int screen, int *list) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return NULL; return (t->ChooseVisual)(dpy, screen, list); } void glXCopyContext(Display *dpy, GLXContext src, GLXContext dst, unsigned long mask) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return; (t->CopyContext)(dpy, src, dst, mask); } GLXContext glXCreateContext(Display *dpy, XVisualInfo *visinfo, GLXContext shareList, Bool direct) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return 0; return (t->CreateContext)(dpy, visinfo, shareList, direct); } GLXPixmap glXCreateGLXPixmap(Display *dpy, XVisualInfo *visinfo, Pixmap pixmap) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return 0; return (t->CreateGLXPixmap)(dpy, visinfo, pixmap); } void glXDestroyContext(Display *dpy, GLXContext ctx) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return; (t->DestroyContext)(dpy, ctx); } void glXDestroyGLXPixmap(Display *dpy, GLXPixmap pixmap) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return; (t->DestroyGLXPixmap)(dpy, pixmap); } int glXGetConfig(Display *dpy, XVisualInfo *visinfo, int attrib, int *value) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return GLX_NO_EXTENSION; return (t->GetConfig)(dpy, visinfo, attrib, value); } GLXContext glXGetCurrentContext(void) { return CurrentContext; } GLXDrawable glXGetCurrentDrawable(void) { return CurrentDrawable; } Bool glXIsDirect(Display *dpy, GLXContext ctx) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return False; return (t->IsDirect)(dpy, ctx); } Bool glXMakeCurrent(Display *dpy, GLXDrawable drawable, GLXContext ctx) { Bool b; struct _glxapi_table *t = get_dispatch(dpy); if (!t) return False; b = (*t->MakeCurrent)(dpy, drawable, ctx); if (b) { CurrentDisplay = dpy; CurrentContext = ctx; CurrentDrawable = drawable; CurrentReadDrawable = drawable; } return b; } Bool glXQueryExtension(Display *dpy, int *errorb, int *event) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return False; return (t->QueryExtension)(dpy, errorb, event); } Bool glXQueryVersion(Display *dpy, int *maj, int *min) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return False; return (t->QueryVersion)(dpy, maj, min); } void glXSwapBuffers(Display *dpy, GLXDrawable drawable) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return; (t->SwapBuffers)(dpy, drawable); } void glXUseXFont(Font font, int first, int count, int listBase) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return; (t->UseXFont)(font, first, count, listBase); } void glXWaitGL(void) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return; (t->WaitGL)(); } void glXWaitX(void) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return; (t->WaitX)(); } #ifdef GLX_VERSION_1_1 const char *glXGetClientString(Display *dpy, int name) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return NULL; return (t->GetClientString)(dpy, name); } const char *glXQueryExtensionsString(Display *dpy, int screen) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return NULL; return (t->QueryExtensionsString)(dpy, screen); } const char *glXQueryServerString(Display *dpy, int screen, int name) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return NULL; return (t->QueryServerString)(dpy, screen, name); } #endif #ifdef GLX_VERSION_1_2 Display *glXGetCurrentDisplay(void) { return CurrentDisplay; } #endif #ifdef GLX_VERSION_1_3 GLXFBConfig *glXChooseFBConfig(Display *dpy, int screen, const int *attribList, int *nitems) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return 0; return (t->ChooseFBConfig)(dpy, screen, attribList, nitems); } GLXContext glXCreateNewContext(Display *dpy, GLXFBConfig config, int renderType, GLXContext shareList, Bool direct) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return 0; return (t->CreateNewContext)(dpy, config, renderType, shareList, direct); } GLXPbuffer glXCreatePbuffer(Display *dpy, GLXFBConfig config, const int *attribList) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return 0; return (t->CreatePbuffer)(dpy, config, attribList); } GLXPixmap glXCreatePixmap(Display *dpy, GLXFBConfig config, Pixmap pixmap, const int *attribList) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return 0; return (t->CreatePixmap)(dpy, config, pixmap, attribList); } GLXWindow glXCreateWindow(Display *dpy, GLXFBConfig config, Window win, const int *attribList) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return 0; return (t->CreateWindow)(dpy, config, win, attribList); } void glXDestroyPbuffer(Display *dpy, GLXPbuffer pbuf) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return; (t->DestroyPbuffer)(dpy, pbuf); } void glXDestroyPixmap(Display *dpy, GLXPixmap pixmap) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return; (t->DestroyPixmap)(dpy, pixmap); } void glXDestroyWindow(Display *dpy, GLXWindow window) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return; (t->DestroyWindow)(dpy, window); } GLXDrawable glXGetCurrentReadDrawable(void) { return CurrentReadDrawable; } int glXGetFBConfigAttrib(Display *dpy, GLXFBConfig config, int attribute, int *value) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return GLX_NO_EXTENSION; return (t->GetFBConfigAttrib)(dpy, config, attribute, value); } GLXFBConfig *glXGetFBConfigs(Display *dpy, int screen, int *nelements) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return 0; return (t->GetFBConfigs)(dpy, screen, nelements); } void glXGetSelectedEvent(Display *dpy, GLXDrawable drawable, unsigned long *mask) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return; (t->GetSelectedEvent)(dpy, drawable, mask); } XVisualInfo *glXGetVisualFromFBConfig(Display *dpy, GLXFBConfig config) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return NULL; return (t->GetVisualFromFBConfig)(dpy, config); } Bool glXMakeContextCurrent(Display *dpy, GLXDrawable draw, GLXDrawable read, GLXContext ctx) { struct _glxapi_table *t = get_dispatch(dpy); Bool b; if (!t) return False; b = (t->MakeContextCurrent)(dpy, draw, read, ctx); if (b) { CurrentDisplay = dpy; CurrentContext = ctx; CurrentDrawable = draw; CurrentReadDrawable = read; } return b; } int glXQueryContext(Display *dpy, GLXContext ctx, int attribute, int *value) { struct _glxapi_table *t = get_dispatch(dpy); assert(t); if (!t) return 0; /* XXX correct? */ return (t->QueryContext)(dpy, ctx, attribute, value); } void glXQueryDrawable(Display *dpy, GLXDrawable draw, int attribute, unsigned int *value) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return; (t->QueryDrawable)(dpy, draw, attribute, value); } void glXSelectEvent(Display *dpy, GLXDrawable drawable, unsigned long mask) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return; (t->SelectEvent)(dpy, drawable, mask); } #endif /* GLX_VERSION_1_3 */ #ifdef GLX_EXT_import_context void glXFreeContextEXT(Display *dpy, GLXContext context) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return; (t->FreeContextEXT)(dpy, context); } GLXContextID glXGetContextIDEXT(const GLXContext context) { /* XXX is this function right? */ struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->GetContextIDEXT)(context); } Display *glXGetCurrentDisplayEXT(void) { return CurrentDisplay; } GLXContext glXImportContextEXT(Display *dpy, GLXContextID contextID) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return 0; return (t->ImportContextEXT)(dpy, contextID); } int glXQueryContextInfoEXT(Display *dpy, GLXContext context, int attribute,int *value) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return 0; /* XXX ok? */ return (t->QueryContextInfoEXT)(dpy, context, attribute, value); } #endif #ifdef GLX_SGI_video_sync int glXGetVideoSyncSGI(unsigned int *count) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->GetVideoSyncSGI)(count); } int glXWaitVideoSyncSGI(int divisor, int remainder, unsigned int *count) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->WaitVideoSyncSGI)(divisor, remainder, count); } #endif #ifdef GLX_SGIX_video_resize int glXBindChannelToWindowSGIX(Display *dpy, int screen, int channel , Window window) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->BindChannelToWindowSGIX)(dpy, screen, channel, window); } int glXChannelRectSGIX(Display *dpy, int screen, int channel, int x, int y, int w, int h) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->ChannelRectSGIX)(dpy, screen, channel, x, y, w, h); } int glXQueryChannelRectSGIX(Display *dpy, int screen, int channel, int *x, int *y, int *w, int *h) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->QueryChannelRectSGIX)(dpy, screen, channel, x, y, w, h); } int glXQueryChannelDeltasSGIX(Display *dpy, int screen, int channel, int *dx, int *dy, int *dw, int *dh) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->QueryChannelDeltasSGIX)(dpy, screen, channel, dx, dy, dw, dh); } int glXChannelRectSyncSGIX(Display *dpy, int screen, int channel, GLenum synctype) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->ChannelRectSyncSGIX)(dpy, screen, channel, synctype); } #endif #ifdef GLX_SGIX_fbconfig int glXGetFBConfigAttribSGIX(Display *dpy, GLXFBConfigSGIX config, int attribute, int *value) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->GetFBConfigAttribSGIX)(dpy, config, attribute, value); } GLXFBConfigSGIX * glXChooseFBConfigSGIX(Display *dpy, int screen, int *attrib_list, int *nelements) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->ChooseFBConfigSGIX)(dpy, screen, attrib_list, nelements); } GLXPixmap glXCreateGLXPixmapWithConfigSGIX(Display *dpy, GLXFBConfigSGIX config, Pixmap pixmap) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->CreateGLXPixmapWithConfigSGIX)(dpy, config, pixmap); } GLXContext glXCreateContextWithConfigSGIX(Display *dpy, GLXFBConfigSGIX config, int render_type, GLXContext share_list, Bool direct) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->CreateContextWithConfigSGIX)(dpy, config, render_type, share_list, direct); } XVisualInfo * glXGetVisualFromFBConfigSGIX(Display *dpy, GLXFBConfigSGIX config) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->GetVisualFromFBConfigSGIX)(dpy, config); } GLXFBConfigSGIX glXGetFBConfigFromVisualSGIX(Display *dpy, XVisualInfo *vis) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return 0; return (t->GetFBConfigFromVisualSGIX)(dpy, vis); } #endif #ifdef GLX_MESA_copy_sub_buffer void glXCopySubBufferMESA(Display *dpy, GLXDrawable drawable, int x, int y, int width, int height) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return; (t->CopySubBufferMESA)(dpy, drawable, x, y, width, height); } #endif #ifdef GLX_MESA_release_buffers Bool glXReleaseBuffersMESA(Display *dpy, Window w) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return False; return (t->ReleaseBuffersMESA)(dpy, w); } #endif #ifdef GLX_MESA_pixmap_colormap GLXPixmap glXCreateGLXPixmapMESA(Display *dpy, XVisualInfo *visinfo, Pixmap pixmap, Colormap cmap) { struct _glxapi_table *t = get_dispatch(dpy); if (!t) return 0; return (t->CreateGLXPixmapMESA)(dpy, visinfo, pixmap, cmap); } #endif #ifdef GLX_MESA_set_3dfx_mode Bool glXSet3DfxModeMESA(int mode) { struct _glxapi_table *t = get_dispatch(CurrentDisplay); if (!t) return False; return (t->Set3DfxModeMESA)(mode); } #endif /**********************************************************************/ /* GLX API management functions */ /**********************************************************************/ const char * _glxapi_get_version(void) { return "1.3"; } /* * Return array of extension strings. */ const char ** _glxapi_get_extensions(void) { static const char *extensions[] = { #ifdef GLX_EXT_import_context "GLX_EXT_import_context", #endif #ifdef GLX_SGI_video_sync "GLX_SGI_video_sync", #endif #ifdef GLX_MESA_copy_sub_buffer "GLX_MESA_copy_sub_buffer", #endif #ifdef GLX_MESA_release_buffers "GLX_MESA_release_buffers", #endif #ifdef GLX_MESA_pixmap_colormap "GLX_MESA_pixmap_colormap", #endif #ifdef GLX_MESA_set_3dfx_mode "GLX_MESA_set_3dfx_mode", #endif NULL }; return extensions; } /* * Return size of the GLX dispatch table, in entries, not bytes. */ GLuint _glxapi_get_dispatch_table_size(void) { return sizeof(struct _glxapi_table) / sizeof(void *); } static int generic_no_op_func(void) { return 0; } /* * Initialize all functions in given dispatch table to be no-ops */ void _glxapi_set_no_op_table(struct _glxapi_table *t) { GLuint n = _glxapi_get_dispatch_table_size(); GLuint i; void **dispatch = (void **) t; for (i = 0; i < n; i++) { dispatch[i] = (void *) generic_no_op_func; } } struct name_address_pair { const char *Name; GLvoid *Address; }; static struct name_address_pair GLX_functions[] = { { "glXChooseVisual", (GLvoid *) glXChooseVisual }, { "glXCopyContext", (GLvoid *) glXCopyContext }, { "glXCreateContext", (GLvoid *) glXCreateContext }, { "glXCreateGLXPixmap", (GLvoid *) glXCreateGLXPixmap }, { "glXDestroyContext", (GLvoid *) glXDestroyContext }, { "glXDestroyGLXPixmap", (GLvoid *) glXDestroyGLXPixmap }, { "glXGetConfig", (GLvoid *) glXGetConfig }, { "glXGetCurrentContext", (GLvoid *) glXGetCurrentContext }, { "glXGetCurrentDrawable", (GLvoid *) glXGetCurrentDrawable }, { "glXIsDirect", (GLvoid *) glXIsDirect }, { "glXMakeCurrent", (GLvoid *) glXMakeCurrent }, { "glXQueryExtension", (GLvoid *) glXQueryExtension }, { "glXQueryVersion", (GLvoid *) glXQueryVersion }, { "glXSwapBuffers", (GLvoid *) glXSwapBuffers }, { "glXUseXFont", (GLvoid *) glXUseXFont }, { "glXWaitGL", (GLvoid *) glXWaitGL }, { "glXWaitX", (GLvoid *) glXWaitX }, #ifdef GLX_VERSION_1_1 { "glXGetClientString", (GLvoid *) glXGetClientString }, { "glXQueryExtensionsString", (GLvoid *) glXQueryExtensionsString }, { "glXQueryServerString", (GLvoid *) glXQueryServerString }, #endif #ifdef GLX_VERSION_1_2 { "glXGetCurrentDisplay", (GLvoid *) glXGetCurrentDisplay }, #endif #ifdef GLX_VERSION_1_3 { "glXChooseFBConfig", (GLvoid *) glXChooseFBConfig }, { "glXCreateNewContext", (GLvoid *) glXCreateNewContext }, { "glXCreatePbuffer", (GLvoid *) glXCreatePbuffer }, { "glXCreatePixmap", (GLvoid *) glXCreatePixmap }, { "glXCreateWindow", (GLvoid *) glXCreateWindow }, { "glXDestroyPbuffer", (GLvoid *) glXDestroyPbuffer }, { "glXDestroyPixmap", (GLvoid *) glXDestroyPixmap }, { "glXDestroyWindow", (GLvoid *) glXDestroyWindow }, { "glXGetCurrentReadDrawable", (GLvoid *) glXGetCurrentReadDrawable }, { "glXGetFBConfigAttrib", (GLvoid *) glXGetFBConfigAttrib }, { "glXGetSelectedEvent", (GLvoid *) glXGetSelectedEvent }, { "glXGetVisualFromFBConfig", (GLvoid *) glXGetVisualFromFBConfig }, { "glXMakeContextCurrent", (GLvoid *) glXMakeContextCurrent }, { "glXQueryContext", (GLvoid *) glXQueryContext }, { "glXQueryDrawable", (GLvoid *) glXQueryDrawable }, { "glXSelectEvent", (GLvoid *) glXSelectEvent }, #endif #ifdef GLX_SGI_video_sync { "glXGetVideoSyncSGI", (GLvoid *) glXGetVideoSyncSGI }, { "glXWaitVideoSyncSGI", (GLvoid *) glXWaitVideoSyncSGI }, #endif #ifdef GLX_MESA_copy_sub_buffer { "glXCopySubBufferMESA", (GLvoid *) glXCopySubBufferMESA }, #endif #ifdef GLX_MESA_release_buffers { "glXReleaseBuffersMESA", (GLvoid *) glXReleaseBuffersMESA }, #endif #ifdef GLX_MESA_pixmap_colormap { "glXCreateGLXPixmapMESA", (GLvoid *) glXCreateGLXPixmapMESA }, #endif #ifdef GLX_MESA_set_3dfx_mode { "glXSet3DfxModeMESA", (GLvoid *) glXSet3DfxModeMESA }, #endif { "glXGetProcAddressARB", (GLvoid *) glXGetProcAddressARB }, { NULL, NULL } /* end of list */ }; /* * Return address of named glX function, or NULL if not found. */ const GLvoid * _glxapi_get_proc_address(const char *funcName) { GLuint i; for (i = 0; GLX_functions[i].Name; i++) { if (strcmp(GLX_functions[i].Name, funcName) == 0) return GLX_functions[i].Address; } return NULL; } /* * This function does not get dispatched through the dispatch table * since it's really a "meta" function. */ void (*glXGetProcAddressARB(const GLubyte *procName))() { typedef void (*gl_function)(); gl_function f; f = (gl_function) _glxapi_get_proc_address((const char *) procName); if (f) { return f; } f = (gl_function) _glapi_get_proc_address((const char *) procName); return f; }