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opcode
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Specifies a symbolic constant that selects a logical operation.
The following symbols are accepted:
GL_CLEAR
,
GL_SET
,
GL_COPY
,
GL_COPY_INVERTED
,
GL_NOOP
,
GL_INVERT
,
GL_AND
,
GL_NAND
,
GL_OR
,
GL_NOR
,
GL_XOR
,
GL_EQUIV
,
GL_AND_REVERSE
,
GL_AND_INVERTED
,
GL_OR_REVERSE
, and
GL_OR_INVERTED
. The initial value is
GL_COPY
.
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