glColorMask — enable and disable writing of frame buffer color components
Specify whether red, green, blue, and alpha can or cannot be written
into the frame buffer.
The initial values are all
indicating that the color components can be written.
glColorMask specifies whether the individual color components in the frame buffer
can or cannot be written.
no change is made to the red component of any pixel in any of the
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.
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