func FlushMappedBufferRange(target uint32, offset int, length int) {
	syscall.Syscall(gpFlushMappedBufferRange, 3, uintptr(target), uintptr(offset), uintptr(length))
}
func FlushMappedBufferRange(target uint32, offset int, length int) {
	syscall.Syscall(gpFlushMappedBufferRange, 3, uintptr(target), uintptr(offset), uintptr(length))
}
func FlushMappedBufferRange ( target uint32 , offset int , length int ) { syscall . Syscall ( gpFlushMappedBufferRange , 3 , uintptr ( target ) , uintptr ( offset ) , uintptr ( length ) ) }
// indicate modifications to a range of a mapped buffer
indicate modifications to a range of a mapped buffer