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glXChooseVisual

Chapter 3

GLX_ACCUM_GREEN_SIZE

Must be followed by a nonnegative minimum size speciﬁcation. If this value is zero,

visuals with no green accumulation buffer are preferred. Otherwise, the largest possible

green accumulation buffer of at least the minimum size is preferred.

GLX_ACCUM_BLUE_SIZE

Must be followed by a nonnegative minimum size speciﬁcation. If this value is zero,

visuals with no blue accumulation buffer are preferred. Otherwise, the largest possible

blue accumulation buffer of at least the minimum size is preferred.

GLX_ACCUM_ALPHA_SIZE

Must be followed by a nonnegative minimum size speciﬁcation. If this value is zero,

visuals with no alpha accumulation buffer are preferred. Otherwise, the largest possible

alpha accumulation buffer of at least the minimum size is preferred.

Examples

attribList =

GLX_RGBA,

GLX_RED_SIZE, 4,

GLX_GREEN_SIZE, 4,

GLX_BLUE_SIZE, 4,

None};

Speciﬁes a single-buffered RGB visual in the normal frame buffer, not an overlay or

underlay buffer. The returned visual supports at least four bits each of red, green, and

blue, and possibly no bits of alpha. It does not support color index mode,

double-buffering, or stereo display. It may or may not have one or more auxiliary color

buffers, a depth buffer, a stencil buffer, or an accumulation buffer.

Notes

XVisualInfo is deﬁned in Xutil.h. It is a structure that includes visual, visualID, screen,

and depth elements.

glXChooseVisual is implemented as a client-side utility using only XGetVisualInfo and

glXGetConﬁg. Calls to these two routines can be used to implement selection algorithms

other than the generic one implemented by glXChooseVisual.

GLX implementers are strongly discouraged, but not proscribed, from changing the

selection algorithm used by glXChooseVisual. Therefore, selections may change from

release to release of the client-side library.

There is no direct ﬁlter for picking only visuals that support GLXPixmaps. GLXPixmaps

are supported for visuals whose GLX_BUFFER_SIZE is one of the pixmap depths

supported by the X server.

Errors

• NULL is returned if an undeﬁned GLX attribute is encountered in attribList.

HP b2600 Reference Guide

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