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glXGetConﬁg

Chapter 7

188

glXGetConﬁg

glXGetConfig: return information about GLX visuals.

C Speciﬁcation

int glXGetConfig(

Display *dpy,

XVisualInfo *vis,

int attrib,

int *value)

Parameters

dpy Speciﬁes the connection to the X server.

vis Speciﬁes the visual to be queried. It is a pointer to an XVisualInfo

structure, not a visual ID or a pointer to a Visual.

attrib 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 anerror 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.

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