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 fglColor, fglColorPointer, fglDepthMask, fglIndex, fglIndexPointer, fglIndexMask, fglStencilMask