src/glx/windows/wgl.c

   1 /*
   2  * Copyright © 2014 Jon Turney
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 /*
  25   Wrapper functions for calling WGL extension functions
  26  */
  27
  28 #include "wgl.h"
  29
  30 #include <stdio.h>
  31
  32 #define RESOLVE_DECL(type) \
  33     static type type##proc = NULL;
  34
  35 #define PRERESOLVE(type, symbol) \
  36     type##proc = (type)wglGetProcAddress(symbol); \
  37     if (type##proc == NULL) \
  38        printf("Can't resolve \"%s\"\n", symbol);
  39
  40 #define CHECK_RESOLVED(type, retval) \
  41   if (type##proc == NULL) { \
  42     return retval; \
  43   }
  44
  45 #define RESOLVED_PROC(type) type##proc
  46
  47 RESOLVE_DECL(PFNWGLGETEXTENSIONSSTRINGARBPROC);
  48 RESOLVE_DECL(PFNWGLCREATECONTEXTATTRIBSARBPROC);
  49 RESOLVE_DECL(PFNWGLMAKECONTEXTCURRENTARBPROC);
  50 RESOLVE_DECL(PFNWGLCREATEPBUFFERARBPROC);
  51 RESOLVE_DECL(PFNWGLGETPBUFFERDCARBPROC);
  52 RESOLVE_DECL(PFNWGLRELEASEPBUFFERDCARBPROC);
  53 RESOLVE_DECL(PFNWGLDESTROYPBUFFERARBPROC);
  54
  55 void wglResolveExtensionProcs(void)
  56 {
  57   PRERESOLVE(PFNWGLGETEXTENSIONSSTRINGARBPROC, "wglGetExtensionsStringARB");
  58   PRERESOLVE(PFNWGLCREATECONTEXTATTRIBSARBPROC, "wglCreateContextAttribsARB");
  59   PRERESOLVE(PFNWGLMAKECONTEXTCURRENTARBPROC, "wglMakeContextCurrentARB");
  60   PRERESOLVE(PFNWGLCREATEPBUFFERARBPROC, "wglCreatePbufferARB");
  61   PRERESOLVE(PFNWGLGETPBUFFERDCARBPROC, "wglGetPbufferDCARB");
  62   PRERESOLVE(PFNWGLRELEASEPBUFFERDCARBPROC, "wglReleasePbufferDCARB");
  63   PRERESOLVE(PFNWGLDESTROYPBUFFERARBPROC, "wglDestroyPbufferARB");
  64 }
  65
  66 const char *wglGetExtensionsStringARB(HDC hdc_)
  67 {
  68    CHECK_RESOLVED(PFNWGLGETEXTENSIONSSTRINGARBPROC, "");
  69    return RESOLVED_PROC(PFNWGLGETEXTENSIONSSTRINGARBPROC)(hdc_);
  70 }
  71
  72 HGLRC wglCreateContextAttribsARB(HDC hdc_, HGLRC hShareContext_,
  73                                      const int *attribList_)
  74 {
  75    CHECK_RESOLVED(PFNWGLCREATECONTEXTATTRIBSARBPROC, NULL);
  76    return RESOLVED_PROC(PFNWGLCREATECONTEXTATTRIBSARBPROC)(hdc_, hShareContext_, attribList_);
  77 }
  78
  79 BOOL wglMakeContextCurrentARB(HDC hDrawDC_, HDC hReadDC_, HGLRC hglrc_)
  80 {
  81    CHECK_RESOLVED(PFNWGLMAKECONTEXTCURRENTARBPROC, FALSE);
  82    return RESOLVED_PROC(PFNWGLMAKECONTEXTCURRENTARBPROC)(hDrawDC_, hReadDC_, hglrc_);
  83 }
  84
  85 HPBUFFERARB wglCreatePbufferARB(HDC hDC_, int iPixelFormat_, int iWidth_,
  86                                 int iHeight_, const int *piAttribList_)
  87 {
  88    CHECK_RESOLVED(PFNWGLCREATEPBUFFERARBPROC, NULL);
  89    return RESOLVED_PROC(PFNWGLCREATEPBUFFERARBPROC)(hDC_, iPixelFormat_, iWidth_, iHeight_, piAttribList_);
  90 }
  91
  92 HDC wglGetPbufferDCARB(HPBUFFERARB hPbuffer_)
  93 {
  94    CHECK_RESOLVED(PFNWGLGETPBUFFERDCARBPROC, NULL);
  95    return RESOLVED_PROC(PFNWGLGETPBUFFERDCARBPROC)(hPbuffer_);
  96 }
  97
  98 int wglReleasePbufferDCARB(HPBUFFERARB hPbuffer_, HDC hDC_)
  99 {
 100    CHECK_RESOLVED(PFNWGLRELEASEPBUFFERDCARBPROC, 0)
 101    return RESOLVED_PROC(PFNWGLRELEASEPBUFFERDCARBPROC)(hPbuffer_, hDC_);
 102 }
 103
 104 BOOL wglDestroyPbufferARB(HPBUFFERARB hPbuffer_)
 105 {
 106    CHECK_RESOLVED(PFNWGLDESTROYPBUFFERARBPROC, FALSE);
 107    return RESOLVED_PROC(PFNWGLDESTROYPBUFFERARBPROC)(hPbuffer_);
 108 }