glClearAccum.3G man page
glClearAccum — specify clear values for the accumulation buffer void glClearAccum( GLfloat red, 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]. GL_INVALID_OPERATION is generated if glClearAccum is executed between the execution of glBegin and the corresponding execution of glEnd. glGet with argument GL_ACCUM_CLEAR_VALUEC Specification
GLfloat green,
GLfloat blue,
GLfloat alpha )
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