HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 188

G glXGetConfig glXGetConfig glXGetConfig: return information about GLX visuals. C Specification int glXGetConfig( Display *dpy, XVisualInfo *vis, int attrib, int *value) Parameters dpy vis attrib Specifies the connection to the X server. Specifies the visual to be queried. It is a pointer to an XVisualInfo structure, not a visual ID or a pointer to a Visual. Specifies the visual attribute to be returned. value Returns the requested value. Description glXGetConfig sets value to the attrib value of windows or GLX pixmaps created with respect to vis. glXGetConfig returns an error code if it fails for an reason. Otherwise, zero is returned. attrib is one of the following: GLX_USE_GL True if OpenGL rendering is supported by this visual, False otherwise. GLX_BUFFER_SIZE Number of bits per color buffer. For RGBA visuals, GLX_BUFFER_SIZE is the sum of GLX_RED_SIZE, GLX_GREEN_SIZE, GLX_BLUE_SIZE, and GLX_ALPHA_SIZE. For color index visuals, GLX_BUFFER_SIZE is the size of the color indexes. GLX_LEVEL Frame buffer level of the visual. Level zero is the default frame buffer. Positive levels correspond to frame buffers that overlay the default buffer, and negative levels correspond to frame buffers that underlay the default buffer. GLX_RGBA True if color buffers store red, green, blue, and alpha values. False if they store color indexes. GLX_DOUBLEBUFFER True if color buffers exist in front/back pairs that can be swapped, False otherwise. GLX_STEREO True if color buffers exist in left/right pairs, False otherwise. 188 Chapter 7