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      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 }
    109