cpack(3G)

NAME
     cpack - specifies RGBA color with a single packed 32-bit integer

FORTRAN 77 SPECIFICATION
     subroutine cpack(pack)
     integer*4 pack

PARAMETERS
     pack   expects a packed integer containing the RGBA (red, green, blue,
            alpha) values you want to assign as the current color. Expressed
            in hexadecimal, the format of the packed integer is $aabbggrr,
            where:

               aa   is the alpha value,
               bb   is the blue value,
               gg   is the green value, and
               rr   is the red value.

            RGBA component values range from 0 to $FF (255).

DESCRIPTION
     cpack sets the red, green, blue, and alpha color components of the
     currently active GL framebuffer, one of normal, popup, overlay, or
     underlay (see drawmo).  The current framebuffer must be in RGB mode (see
     RGBmod) for the cpack command to be applicable.  Most drawing commands
     copy the current RGBA color components into the color bitplanes of the
     current framebuffer.  Color components are retained in each draw mode, so
     when a draw mode is re-entered, red, green, blue, and alpha are reset to
     the last value specified in that draw mode.

     Color component values range from 0, specifying no intensity, through
     255, specifying maximum intensity.  For example, cpack($FF004080) sets
     red to 16#80# (half intensity), green to 16#40# (quarter intensity), blue
     to 0 (off), and alpha to 16#FF# (full intensity).

     It is an error to call cpack while the current framebuffer is in color
     map mode.

     The color components of all framebuffers in RGB mode are set to zero when
     gconfi is called.

SEE ALSO
     c, drawmo, gRGBco, lmcolo

NOTE
     cpack can also be used to modify the current material while lighting is
     active (see lmcolo).

     Because only the normal framebuffer currently supports RGB mode, cpack
     should be called only while draw mode is NORMAL.  Use getgde to determine
     whether RGB mode is available in draw mode NORMAL.