func DepthRangeIndexed(index uint32, n float64, f float64) {
	syscall.Syscall(gpDepthRangeIndexed, 3, uintptr(index), uintptr(math.Float64bits(n)), uintptr(math.Float64bits(f)))
}
func DepthRangeIndexed(index uint32, n float64, f float64) {
	syscall.Syscall(gpDepthRangeIndexed, 3, uintptr(index), uintptr(math.Float64bits(n)), uintptr(math.Float64bits(f)))
}
func DepthRangeIndexed ( index uint32 , n float64 , f float64 ) { syscall . Syscall ( gpDepthRangeIndexed , 3 , uintptr ( index ) , uintptr ( math . Float64bits ( n ) ) , uintptr ( math . Float64bits ( f ) ) ) }
// specify mapping of depth values from normalized device coordinates to window coordinates for a specified viewport
specify mapping of depth values from normalized device coordinates to window coordinates for a specified viewport