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.