src/glut/dos/extens.c

   1 /*
   2  * DOS/DJGPP Mesa Utility Toolkit
   3  * Version:  1.0
   4  *
   5  * Copyright (C) 2005  Daniel Borca   All Rights Reserved.
   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
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * DANIEL BORCA BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  21  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 #include <string.h>
  27
  28 #include "internal.h"
  29
  30
  31 int APIENTRY
  32 glutExtensionSupported (const char *extension)
  33 {
  34    static const GLubyte *extensions = NULL;
  35    const GLubyte *last, *where;
  36
  37    /* Extension names should not have spaces. */
  38    if (strchr(extension, ' ') || *extension == '\0') {
  39       return GL_FALSE;
  40    }
  41
  42    /* Not my problem if you don't have a valid OpenGL context */
  43    if (!extensions) {
  44       extensions = glGetString(GL_EXTENSIONS);
  45    }
  46    if (!extensions) {
  47       return GL_FALSE;
  48    }
  49
  50    /* Take care of sub-strings etc. */
  51    for (last = extensions;;) {
  52       if ((where = (GLubyte *)strstr((const char *)last, extension)) == NULL) {
  53          return GL_FALSE;
  54       }
  55       last = where + strlen(extension);
  56       if (where == extensions || *(where - 1) == ' ') {
  57          if (*last == ' ' || *last == '\0') {
  58             return GL_TRUE;
  59          }
  60       }
  61    }
  62 }
  63
  64
  65 GLUTproc APIENTRY
  66 glutGetProcAddress (const char *procName)
  67 {
  68    /* TODO - handle glut namespace */
  69    return (GLUTproc)DMesaGetProcAddress(procName);
  70 }