HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 63

C glColorMask glColorMask glColorMask: enable and disable writing of frame buffer color components. C Specification void glColorMask( 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 GL_TRUE, indicating that the color components can be written. Description glColorMask 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 glColorMask is executed between the execution of glBegin and the corresponding execution of glEnd. Associated Gets glGet with argument GL_COLOR_WRITEMASK glGet with argument GL_RGBA_MODE See Also glColor, glColorPointer, glDepthMask, glIndex, glIndexPointer, glIndexMask, glStencilMask Chapter 3 63