glClearAccum specifies the red, green, blue, and alpha values used by glClear to clear the accumulation buffer. Values specified by glClearAccum are clamped to the range -1 1.
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glClearAccum: man2/glClearAccum.xml
glClearAccum specifies the red, green, blue, and alpha values used by glClear to clear the accumulation buffer. Values specified by glClearAccum are clamped to the range -1 1.