fglColorMask man page on IRIX

fglColorMask man page on IRIX

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fglColorMask(3G)	       OpenGL Reference		      fglColorMask(3G)

NAME
     fglColorMask - enable and disable writing of frame buffer color
     components

FORTRAN SPECIFICATION
     SUBROUTINE fglColorMask( LOGICAL*1 red,
			      LOGICAL*1 green,
			      LOGICAL*1 blue,
			      LOGICAL*1 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 GL_TRUE, indicating that the
			   color components can be written.

DESCRIPTION
     fglColorMask specifies whether the individual color components in the
     frame buffer can or cannot be written.  If red is GL_FALSE, for example,
     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.

ERRORS
     GL_INVALID_OPERATION is generated if fglColorMask is executed between the
     execution of fglBegin and the corresponding execution of fglEnd.

ASSOCIATED GETS
     fglGet with argument GL_COLOR_WRITEMASK
     fglGet with argument GL_RGBA_MODE

SEE ALSO
     fglClear, fglColor, fglColorPointer, fglDepthMask, fglIndex,
     fglIndexPointer, fglIndexMask, fglStencilMask

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