RGBsize(3G) RGBsize(3G)
NAME
RGBsize - specifies the number of bit planes desired to comprise each
single-color component buffer.
C SPECIFICATION
void RGBsize(long planes)
PARAMETERS
planes is the number of bit planes requested to be configured as color
planes for each single-color component. Only positive values
are accepted. The default is machine dependent, usually 8 or
12.
DESCRIPTION
RGBsize specifies how may bit planes are requested to be configured as
planes for each one of the red, green, blue, and alpha color component.
The constraints on planes are machine dependent. Call getgdesc() with
the appropriate parameter to determine the maximum number of bit planes
available for color buffers operation.
RGBsize takes effect only after gconfig has been called. The number of
bit planes granted for the color buffers may not be exactly what was
requested. Call getgconfig with the appropriate parameter to determine
how many bit planes were configured as color planes.
Since RGBA color bit planes are available only in the normal framebuffer,
RGBsize should be called only while draw mode is NORMALDRAW.
SEE ALSO
gconfig, getgconfig, getgdesc
NOTES
This routine is available only in immediate mode.
Since most machines support only a finite set of RGBA color buffer sizes,
planes is rounded to the nearest supported size.
IRIS-4D G, GT, GTX, VGX, and VGXT models, the Personal Iris, Indy, Indigo
Entry, XL, XS, XS24, XZ, Elan and Extreme systems do not support RGBsize.
The IRIS-4D RealityEngine models support only values of 8 or 12 planes.
BUGS
On the IRIS-4D RealityEngine models when the number of planes configured
for each single-color component is 8, the framebuffer consist of no alpha
bit planes.
On the IRIS-4D RealityEngine models the framebuffer cannot be configured
to consist of 32 Z buffer planes (or 32 depth planes in the multisample
buffer) and 8 color planes for each of the RGB color buffers
simultaneously.
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RGBsize(3G) RGBsize(3G)
On Impact and Infinite reality RGBsize chooses the deepest visual whose
alpha depth is as deep as Red, Green, and Blue. In order to get more
depth of RGB, while possibly sacrificing Alpha depth set glcompat
GLCNODESTALPHA to TRUE.
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