RGBmod(3G)RGBmod(3G)NAME
RGBmod - sets a rendering and display mode that bypasses the color map
FORTRAN 77 SPECIFICATION
subroutine RGBmod
PARAMETERS
none
DESCRIPTION
RGBmod instructs the system to treat color as a 4-component entity in the
currently active drawmode. Currently RGB mode is supported only by the
normal framebuffer, so RGBmod should be called only while in draw mode
NORMAL. You must call gconfi for RGBmod to take effect.
While in RGB mode, a framebuffer is configured to store separate color
values for red, green, blue, and alpha components. Lighting, shading,
and fog calculations are done in the true, RGB color space. Colors and
writemasks must be specified using RGB-compatible commands such as c,
cpack, and wmpack. The red, green, and blue components stored in the
framebuffer are used (after correction for monitor non-linearity) to
directly control the color guns of the monitor.
Many advanced rendering features, such as complex lighting models,
texture mapping, polygon antialiasing, and fog, are available only in RGB
mode.
SEE ALSO
c, cmode, cpack, gammar, gconfi, getdis, getgde, wmpack
NOTE
RGBmod is not supported on all hardware configurations. The command
getgde can be used to determine how many bitplanes in the normal
framebuffer are available for each color component in both single and
double buffered RGB mode.
This routine is available only in immediate mode.
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