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