func SampleCoverage(value float32, invert bool) {
	C.glowSampleCoverage(gpSampleCoverage, (C.GLfloat)(value), (C.GLboolean)(boolToInt(invert)))
}
func SampleCoverage(value float32, invert bool) {
	C.glowSampleCoverage(gpSampleCoverage, (C.GLfloat)(value), (C.GLboolean)(boolToInt(invert)))
}
func SampleCoverage ( value float32 , invert bool ) { C . glowSampleCoverage ( gpSampleCoverage , ( C . GLfloat ) ( value ) , ( C . GLboolean ) ( boolToInt ( invert ) ) ) }
// specify multisample coverage parameters
specify multisample coverage parameters