glew/auto/src/glew_init_glx.c

/* ------------------------------------------------------------------------ */

GLboolean glxewGetExtension (const char* name)
{    
  const GLubyte* start;
  const GLubyte* end;

  if (glXGetCurrentDisplay == NULL) return GL_FALSE;
  start = (const GLubyte*)glXGetClientString(glXGetCurrentDisplay(), GLX_EXTENSIONS);
  if (0 == start) return GL_FALSE;
  end = start + _glewStrLen(start);
  return _glewSearchExtension(name, start, end);
}

GLenum glxewContextInit (GLXEW_CONTEXT_ARG_DEF_LIST)
{
  int major, minor;
  const GLubyte* extStart;
  const GLubyte* extEnd;
  /* initialize core GLX 1.2 */
  if (_glewInit_GLX_VERSION_1_2(GLEW_CONTEXT_ARG_VAR_INIT)) return GLEW_ERROR_GLX_VERSION_11_ONLY;
  /* initialize flags */
  CONST_CAST(GLXEW_VERSION_1_0) = GL_TRUE;
  CONST_CAST(GLXEW_VERSION_1_1) = GL_TRUE;
  CONST_CAST(GLXEW_VERSION_1_2) = GL_TRUE;
  CONST_CAST(GLXEW_VERSION_1_3) = GL_TRUE;
  CONST_CAST(GLXEW_VERSION_1_4) = GL_TRUE;
  /* query GLX version */
  glXQueryVersion(glXGetCurrentDisplay(), &major, &minor);
  if (major == 1 && minor <= 3)
  {
    switch (minor)
    {
      case 3:
      CONST_CAST(GLXEW_VERSION_1_4) = GL_FALSE;
      break;
      case 2:
      CONST_CAST(GLXEW_VERSION_1_4) = GL_FALSE;
      CONST_CAST(GLXEW_VERSION_1_3) = GL_FALSE;
      break;
      default:
      return GLEW_ERROR_GLX_VERSION_11_ONLY;
      break;
    }
  }
  /* query GLX extension string */
  extStart = 0;
  if (glXGetCurrentDisplay != NULL)
    extStart = (const GLubyte*)glXGetClientString(glXGetCurrentDisplay(), GLX_EXTENSIONS);
  if (extStart == 0)
    extStart = (const GLubyte *)"";
  extEnd = extStart + _glewStrLen(extStart);
  /* initialize extensions */