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C.3 Logical Operation

Fragments generated by RGBA rendering may be merged into the framebuffer using a logical operation, just as color index fragments are in GL version 1.0. Blending is disabled during such operation because it is rarely desired, because many systems could not support it, and to match the semantics of the EXT_blend_logic_op extension, on which this addition is loosely based.

David Blythe
Sat Mar 29 02:23:21 PST 1997