vbo.c

   1 /**
   2  * @file vbo.h
   3  * @brief A wrapper around the Vertex Buffer extension to OpenGL 1.1.
   4  *
   5  * Copyright 2008 Stephen M. Webb  <stephen.webb@bregmasoft.ca>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of Version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include "vbo.h"
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25
  26
  27 void initGlVboExtension(void)
  28 {
  29 #ifndef HAVE_GL_VERTEX_BUFFERS
  30   int found = 0;
  31   char* extensions = glGetString(GL_EXTENSIONS);
  32   char* terminator = NULL;
  33   for(;;)
  34   {
  35     char* where = (char*)strstr(extensions, "GL_ARB_vertex_buffer_object");
  36     if (!where) break;
  37     terminator = where + strlen("GL_ARB_vertex_buffer_object");
  38     if (where == extensions || *(where - 1) == ' ')
  39     {
  40       if (*terminator == ' ' || *terminator == '\0')
  41       {
  42         found = 1;
  43         break;
  44       }
  45     }
  46     extensions = terminator;
  47   }
  48
  49   if (!found)
  50   {
  51           fprintf(stderr, "OpenGL vertex buffer extension is not supported.\n");
  52           exit(1);
  53
  54   }
  55
  56   glGenBuffers = (PFNGLGENBUFFERSPROC)wglGetProcAddress("glGenBuffersARB");
  57   glDeleteBuffers = (PFNGLDELETEBUFFERSPROC)wglGetProcAddress("glDeleteBuffersARB");
  58   glBindBuffer = (PFNGLBINDBUFFERPROC)wglGetProcAddress("glBindBufferARB");
  59   glBufferData = (PFNGLBUFFERDATAPROC)wglGetProcAddress("glBufferDataARB");
  60   /* glBufferSubData = (PFNGLBUFFERSUBDATAPROC)wglGetProcAddress("glBufferSubDataARB"); */
  61 #endif
  62 }
  63