glColorMask - enable and disable writing of frame buffer color components
void glColorMask(GLboolean red, GLboolean green, GLboolean blue, GLboolean alpha);
red, green, blue, alpha
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.
glGet() with argument GL_COLOR_WRITEMASK
glClear(), glDepthMask(), glStencilMask()
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