GLCOLORMASK(3G)                                                GLCOLORMASK(3G)



NAME
       glColorask  -  enable and disable writing of frame buffer color compo-
       nents


C SPECIFICATION
       void glColorask( GLboolean red,
                         GLboolean green,
                         GLboolean blue,
                         GLboolean alpha )


PARAMETERS
       red, green, blue, alpha
                             Specify whether red, green, blue, and  alpha  can
                             or  cannot be written into the frame buffer.  The
                             initial values are all GLTRUE,  indicating  that
                             the color components can be written.

DESCRIPTION
       glColorask  specifies  whether  the individual color components in the
       frame buffer can or cannot be written.  If red is GLFALSE,  for  exam-
       ple,  no change is made to the red component of any pixel in any of the
       color buffers, regardless of the drawing operation attempted.

       Changes to individual bits of components cannot be controlled.  Rather,
       changes are either enabled or disabled for entire color components.

ERORS
       GLINVALIDOPERATION  is  generated  if glColorask is executed between
       the execution of glBegin and the corresponding execution of glEnd.

ASOCIATED GETS
       glGet with argument GLCOLORWRITEMASK
       glGet with argument GLRGBAMODE

SEE ALSO
       glClear, glColor, glColorPointer, glDepthask, glIndex, glIndexPointer,
       glIndexask, glStencilask



                                                               GLCOLORMASK(3G)