glew-cmake/auto/src/glew_glx_init.c

GLboolean glxewGetExtension (const char* name)
{    
  GLubyte* p;
  GLubyte* end;
  GLuint len = _glewStrLen((const GLubyte*)name);
/*   if (glXQueryExtensionsString == NULL || glXGetCurrentDisplay == NULL) return GL_FALSE; */
/*   p = (GLubyte*)glXQueryExtensionsString(glXGetCurrentDisplay(), DefaultScreen(glXGetCurrentDisplay())); */
  if (glXGetClientString == NULL || glXGetCurrentDisplay == NULL) return GL_FALSE;
  p = (GLubyte*)glXGetClientString(glXGetCurrentDisplay(), GLX_EXTENSIONS);
  if (0 == p) return GL_FALSE;
  end = p + _glewStrLen(p);
  while (p < end)
  {
    GLuint n = _glewStrCLen(p, ' ');
    if (len == n && _glewStrSame((const GLubyte*)name, p, n)) return GL_TRUE;
    p += n+1;
  }
  return GL_FALSE;
}

GLenum glxewContextInit (GLXEW_CONTEXT_ARG_DEF_LIST)
{
  int major, minor;
  /* 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 */
  GLXEW_VERSION_1_0 = GL_TRUE;
  GLXEW_VERSION_1_1 = GL_TRUE;
  GLXEW_VERSION_1_2 = GL_TRUE;
  GLXEW_VERSION_1_3 = GL_TRUE;
  GLXEW_VERSION_1_4 = GL_TRUE;
  /* query GLX version */
  glXQueryVersion(glXGetCurrentDisplay(), &major, &minor);
  if (major == 1 && minor <= 3)
  {
    switch (minor)
    {
      case 3:
      GLXEW_VERSION_1_4 = GL_FALSE;
      break;
      case 2:
      GLXEW_VERSION_1_4 = GL_FALSE;
      GLXEW_VERSION_1_3 = GL_FALSE;
      break;
      default:
      return GLEW_ERROR_GLX_VERSION_11_ONLY;
      break;
    }
  }
  /* initialize extensions */