static void CheckForShaders(NSOpenGLPixelFormatAttribute *thePixelAttributes)
{
const GLubyte *extensions = glGetString(GL_EXTENSIONS);
GLboolean bShaderObjectAvailable = CheckForExtension("GL_ARB_shader_objects", extensions);
GLboolean bShaderLanguage100Available = CheckForExtension("GL_ARB_shading_language_100", extensions);
GLboolean bVertexShaderAvailable = CheckForExtension("GL_ARB_vertex_shader", extensions);
GLboolean bFragmentShaderAvailable = CheckForExtension("GL_ARB_fragment_shader", extensions);
GLboolean bForceSoftwareRendering = (bShaderObjectAvailable == GL_FALSE)
|| (bShaderLanguage100Available == GL_FALSE)
|| (bVertexShaderAvailable == GL_FALSE)
|| (bFragmentShaderAvailable == GL_FALSE);
if( bForceSoftwareRendering )
{
// Force software rendering, so fragment shaders will execute
CheckForAndLogExtensionAvailable(bShaderObjectAvailable, "GL_ARB_shader_objects");
CheckForAndLogExtensionAvailable(bShaderLanguage100Available, "GL_ARB_shading_language_100");
CheckForAndLogExtensionAvailable(bVertexShaderAvailable, "GL_ARB_vertex_shader");
CheckForAndLogExtensionAvailable(bFragmentShaderAvailable, "GL_ARB_fragment_shader");
thePixelAttributes [3] = NSOpenGLPFARendererID;
thePixelAttributes [4] = kCGLRendererGenericFloatID;
} // if
} // CheckForShaders
int
main(int argc, char *argv[])
{
glutInit(&argc, argv);
printf("Written by Christopher Niederauer\n");
printf("[email protected]\n");
InitGL();
InitSpecial();
#ifdef CCN_DEBUG
printf(" Vendor: %s\n", glGetString(GL_VENDOR));
printf(" Renderer: %s\n", glGetString(GL_RENDERER));
printf(" Version: %s\n", glGetString(GL_VERSION));
printf("Extensions: %s\n", glGetString(GL_EXTENSIONS));
#endif
if (CheckForExtension(TEST_EXTENSION_STRING))
{
printf("Extension %s supported. Executing...\n", TEST_EXTENSION_STRING);
}
else
{
printf("Error: %s not supported. Exiting.\n", TEST_EXTENSION_STRING);
return 0;
}
glutMainLoop();
return 0;
}
static void CheckForClipVolumeHint(NSOpenGLPixelFormatAttribute *thePixelAttributes)
{
const GLubyte *extensions = glGetString(GL_EXTENSIONS);
// Inform OpenGL that the geometry is entirely within the
// view volume and that view-volume clipping is unnecessary.
// Normal clipping can be resumed by setting this hint to
// GL_DONT_CARE. When clipping is disabled with this hint,
// results are undefined if geometry actually falls outside
//the view volume.
GLboolean bClipVolumeHintExtAvailable = CheckForExtension("GL_EXT_clip_volume_hint",
extensions);
if( bClipVolumeHintExtAvailable == GL_TRUE)
{
glHint(GL_CLIP_VOLUME_CLIPPING_HINT_EXT,GL_FASTEST);
} // if
} // CheckForClipVolumeHint
