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//-----------------------------------------------------------------------------
// Name: timer.cpp
// Developer: Wolfire Games LLC
// Author: David Rosen
// Description: The timer handles fixed or dynamic timeSteps
// License: Read below
//-----------------------------------------------------------------------------
//
// Copyright 2022 Wolfire Games LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//-----------------------------------------------------------------------------
#include <Internal/timer.h>
#include <Internal/common.h>
#include <Internal/datemodified.h>
#include <Internal/filesystem.h>
#include <Compat/fileio.h>
#include <Compat/time.h>
#include <Threading/sdl_wrapper.h>
#include <Math/enginemath.h>
#include <SDL.h>
#include <ctime>
#include <cstdlib>
//-----------------------------------------------------------------------------
//Functions
//-----------------------------------------------------------------------------
static const float _time_inertia = 0.6f;
Timer game_timer;
Timer ui_timer;
void Timer::UpdateWallTime() {
wall_ticks = SDL_TS_GetTicks();
wall_time = wall_ticks / 1000.0f;
}
void Timer::Update() {
frame_count++;
uint32_t tick = SDL_TS_GetTicks();
float min_target_time_scale = target_time_scale;
for(std::vector<TimedSlowMotionLayer>::iterator iter = timed_slow_motion_layers.begin();
iter != timed_slow_motion_layers.end();)
{
TimedSlowMotionLayer& layer = (*iter);
if(layer.start_time <= tick){
min_target_time_scale = min(min_target_time_scale, layer.target_time_scale);
}
if(layer.end_time <= tick){
iter = timed_slow_motion_layers.erase(iter);
} else {
iter++;
}
}
time_scale = mix(min_target_time_scale, time_scale, _time_inertia);
game_time += timestep;
}
float Timer::GetInterpWeight(){
return timestep_error;
}
float Timer::GetInterpWeightX(int num, int progress){
float mult = (1.0f/(float)num);
return mult*(float)progress + timestep_error*mult;
}
float Timer::GetRenderTime() {
return game_time + timestep_error * timestep;
}
float Timer::GetAverageFrameTime() {
float sum = .0f;
for (unsigned long i : frame) {
sum += i;
}
return sum / (float)NUM_AVERAGED_FRAMES;
}
//Set simulations per second
void Timer::SetStepFrequency(int sims) {
simulations_per_second = sims;
uint32_t tick = SDL_TS_GetTicks();
last_tick = tick;
timestep = 1/((float)simulations_per_second);
srand(tick);
}
//Get number of timeSteps to use this display frame
int Timer::GetStepsNeeded() {
uint32_t tick = SDL_TS_GetTicks();
int num;
num=((int)((tick-last_tick)*simulations_per_second*time_scale)/1000);
last_tick+=(int)((num*1000)/(simulations_per_second*time_scale));
timestep_error=(tick-last_tick)/1000.0f*simulations_per_second*time_scale;
return num;
}
//We have rendered another frame, so gather fps data
void Timer::ReportFrameForFPSCount() {
for (int i = 0;i<NUM_AVERAGED_FRAMES-1;i++){
frame[i]=frame[i+1];
}
frame[NUM_AVERAGED_FRAMES-1]=GetPrecisionTime();
}
//Calculate fps
int Timer::GetFramesPerSecond() {
uint64_t frame_diff = ToNanoseconds(frame[NUM_AVERAGED_FRAMES-1] - frame[0]);
if (frame_diff != 0) {
return (int) (1000*NUM_AVERAGED_FRAMES/(frame_diff * 0.000001));
} else {
return 0;
}
}
float Timer::GetFrameTime() {
uint64_t frame_diff = ToNanoseconds(frame[NUM_AVERAGED_FRAMES-1] - frame[0]);
if (frame_diff != 0) {
return (frame_diff * 0.000001f)/NUM_AVERAGED_FRAMES;
} else {
return 0;
}
}
float Timer::GetWallTime() {
return wall_time;
}
uint32_t Timer::GetWallTicks() {
return wall_ticks;
}
float Timer::GetSlowestFrameTime() {
uint64_t slowest = frame[1] - frame[0];
for(int i = 1; i < NUM_AVERAGED_FRAMES; ++i) {
slowest = std::max(slowest, frame[i] - frame[i - 1]);
}
return ToNanoseconds(slowest) * 0.000001f;
}
float Timer::GetFastestFrameTime() {
int64_t fastest = frame[1] - frame[0];
for(int i = 1; i < NUM_AVERAGED_FRAMES; ++i) {
int64_t current = frame[i] - frame[i - 1];
if(fastest == 0 || current < fastest)
fastest = current;
}
return ToNanoseconds(fastest) * 0.000001f;
}
void Timer::AddTimedSlowMotionLayer( float target_time_scale, float duration, float delay ) {
timed_slow_motion_layers.resize(timed_slow_motion_layers.size()+1);
TimedSlowMotionLayer& layer = timed_slow_motion_layers.back();
layer.target_time_scale = target_time_scale;
layer.start_time = SDL_TS_GetTicks() + (int)(delay * 1000.0f);
layer.end_time = layer.start_time + (int)(duration * 1000.0f);
}
Timer::Timer():
frame_count(0),
target_time_scale(1.0f),
time_scale(1.0f),
game_time(0),
simulations_per_second(30),
last_tick(0),
wall_time(0)
{
for (auto& i : frame) {
i = 0;
}
}
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