Rtch/bettola
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feat(engine): Implement delta time calculation.

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This commit is contained in:
Ritchie Cunningham 2025-09-11 23:21:37 +01:00
parent 8dcd42c97b
commit 6a58b4a8ba
1 changed files with 25 additions and 0 deletions
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25
src/main.cpp
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@ -1,6 +1,9 @@
#include <SDL3/SDL.h>
#include <GL/glew.h>
#include <SDL3/SDL_error.h>
#include <SDL3/SDL_stdinc.h>
#include <SDL3/SDL_timer.h>
#include <SDL3/SDL_video.h>
#include <cstdio>
const int SCREEN_WIDTH = 800;
@ -59,7 +62,21 @@ int main(int argc, char* argv[]) {
bool is_running = true;
SDL_Event event;
/* Delta time calculations. */
Uint64 perf_frequency = SDL_GetPerformanceFrequency();
Uint64 last_counter = SDL_GetPerformanceCounter();
double delta_time = 0;
/* FPS counter for window title. */
char window_title[256];
double time_since_title_update = 0.0;
while(is_running) {
/* Calc delta time. */
Uint64 current_counter = SDL_GetPerformanceCounter();
delta_time = (double)(current_counter-last_counter) / (double)perf_frequency;
last_counter = current_counter;
/* Event handling. */
while(SDL_PollEvent(&event)) {
if(event.type == SDL_EVENT_QUIT) {
@ -67,6 +84,14 @@ int main(int argc, char* argv[]) {
}
}
/* Update window title with FPS counter. */
time_since_title_update += delta_time;
if(time_since_title_update > 0.25) {
snprintf(window_title, 256, "Bettola - FPS: %.2f", 1.0/delta_time);
SDL_SetWindowTitle(window, window_title);
time_since_title_update = 0.0;
}
/* Render that b*tch. */
glClearColor(0.1f, 0.1f, 0.3f, 1.0f); /* Dark blue or something. */
glClear(GL_COLOR_BUFFER_BIT);