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#include <chrono>
#include <cstdio>
#include <cmath>
#include <exception>
#include <thread>
#include <csignal>
#include "player-input.hpp"
#include "asset-manager.hpp"
#include "ecs.hpp"
#include "entities.hpp"
#include "game-settings.hpp"
#include "game-type-defs.hpp"
#include "game.hpp"
#include "window.hpp"
void signal_handler(int signal_num) {
fprintf(stdout, "Received signal: %d - shutting down\n", signal_num);
pkeSettings.isGameRunning = false;
}
PKEWindowProperties windowProps{};
void Tick(double delta) {
Game_Tick(delta);
}
int main() {
signal(SIGTERM, signal_handler);
fprintf(stdout, "PKE ENTERING\n");
try {
AM_Init();
Game_Init();
ECS_Init();
CreateWindow(&windowProps);
PkeInput_Init();
EntityType_Init();
GameTimePoint lastTimePoint = pkeSettings.steadyClock.now();
double deltaTillNextRender = pkeSettings.deltaPerFrame;
GameTimePoint lastLogTimePoint = pkeSettings.steadyClock.now();
int64_t tickCount = 0;
int64_t renderCount = 0;
int64_t nsAhead = 0.0;
while (pkeSettings.isGameRunning) {
glfwPollEvents();
int64_t nsAheadHolder = 0.0;
if (nsAhead > 0) {
nsAheadHolder = nsAhead;
std::this_thread::sleep_for(GameTimeDuration(nsAhead));
nsAhead = 0;
}
if (vidMode.refreshRate != pkeSettings.targetFPS) {
pkeSettings.targetFPS = vidMode.refreshRate;
pkeSettings.deltaPerFrame = 1 / double(pkeSettings.targetFPS);
}
GameTimePoint currentTimePoint = pkeSettings.steadyClock.now();
double deltaThisTick = ((currentTimePoint - lastTimePoint).count() - nsAheadHolder) / NANO_DENOM_DOUBLE;
deltaThisTick = std::min(deltaThisTick, pkeSettings.minimumDeltaPerFrame);
lastTimePoint = currentTimePoint;
deltaTillNextRender -= deltaThisTick;
bool shouldRender = pkeSettings.graphicsSettings.isFramerateUnlocked
|| pkeSettings.graphicsSettings.isWaitingForVsync
|| deltaTillNextRender <= 0.0;
if (shouldRender == false && (deltaTillNextRender > 0.0 && deltaTillNextRender - (deltaThisTick * 2.0) <= 0.0)) {
/*
* We are ahead of the render schedule
* && the current tick's speed would put us behind schedule next tick.
* Simulate the extra time we are ahead and prepare to sleep the difference
* before the next tick.
*/
nsAhead = std::floor(deltaTillNextRender * NANO_DENOM_DOUBLE);
deltaThisTick += deltaTillNextRender;
shouldRender = true;
}
tickCount += 1;
Tick(deltaThisTick);
if (shouldRender) {
Render();
renderCount += 1;
double msBehind = deltaTillNextRender * -1000;
int64_t behindCount = 0;
while (deltaTillNextRender < pkeSettings.deltaPerFrame) {
behindCount += 1;
deltaTillNextRender += pkeSettings.deltaPerFrame;
}
if (behindCount > 2) {
fprintf(stderr, "[PKE::main] late render - simulated ahead: %fms - delta behind: %fms - missed frames:%ld\n", nsAheadHolder / (NANO_DENOM_DOUBLE / 1000), msBehind, behindCount - 1);
fflush(stderr);
}
}
if ((currentTimePoint - lastLogTimePoint).count() > std::chrono::nanoseconds::period::den) {
lastLogTimePoint = currentTimePoint;
fprintf(stdout, "TPS: ~%ld - actual:%ld - presents:%ld\n", int64_t(1 / deltaThisTick), tickCount, renderCount);
fflush(stdout);
tickCount = 0;
renderCount = 0;
}
pkeSettings.isGameRunning = !glfwWindowShouldClose(window);
}
vkDeviceWaitIdle(vkDevice);
} catch (const std::exception &exc) {
fprintf(stdout, "EXCEPTION: %s\n", exc.what());
} catch (const char *err) {
fprintf(stdout, "UNHANDLED EXCEPTION: %s\n", err);
} catch (...) {
fprintf(stdout, "UNHANDLED EXCEPTION\n");
}
fprintf(stdout, "PKE SHUTDOWN INITIATED\n");
Game_Teardown();
Event_Teardown();
EntityType_Teardown();
PkeInput_Teardown();
ECS_Teardown();
AM_DebugPrint();
AM_Teardown();
DestroyWindow();
Pke_DebugPrint();
fprintf(stdout, "PKE EXITING\n");
return 0;
}
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