1// Copyright 2018 The Fuchsia Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#pragma once 6 7#include <inttypes.h> 8 9static inline uint32_t interpolate(uint32_t max, int32_t cur_frame, int32_t period) { 10 float fraction = ((float) (cur_frame % period)) / ((float) period - 1); 11 fraction = (cur_frame / period) % 2 ? 1.0f - fraction : fraction; 12 return (uint32_t) ((float) max * fraction); 13} 14 15