Add change Frame time POG
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010f6799ee
commit
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1 changed files with 91 additions and 12 deletions
99
main.c
99
main.c
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@ -4,32 +4,59 @@
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#include <SDL3/SDL.h>
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#include <SDL3/SDL_main.h> // only include this one in the source file with main()!
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#define INITIAL_FPS 60
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SDL_Window* window = NULL;
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SDL_Renderer* renderer = NULL;
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static double FPS = INITIAL_FPS;
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static double FrameTime = 1.0 / INITIAL_FPS;
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static double PerformancePeriod;
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static void panic ( const char *text ) __attribute__((noreturn));
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static double GetTime()
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{
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return PerformancePeriod * SDL_GetPerformanceCounter();
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}
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static void SetTitle(SDL_Window * window)
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{
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char title[48] = {0};
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SDL_snprintf(title, sizeof(title), "Crude frame limiter @ %6.3f Hz", FPS);
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SDL_SetWindowTitle(window, title);
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}
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void panic ( const char *text )
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{
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fprintf(stderr, "ERROR: %s. %s\n", text, SDL_GetError());
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_Quit();
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exit(1);
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fprintf(stderr, "ERROR: %s. %s\n", text, SDL_GetError());
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_Quit();
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exit(1);
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}
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int main( int argc, char* argv[] )
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{
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const int WIDTH = 640;
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const int HEIGHT = 480;
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int delay_threshold = 2;
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double sleep_time;
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double time_counter = 0;
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bool loopShouldStop = false;
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SDL_SetHint(SDL_HINT_RENDER_VSYNC, 0);
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if (!SDL_Init(SDL_INIT_VIDEO))
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{
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panic("SDL_Init failed");
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}
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window = SDL_CreateWindow("Hello SDL", WIDTH, HEIGHT, 0);
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PerformancePeriod = 1.0 / SDL_GetPerformanceFrequency();
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time_counter = GetTime();
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window = SDL_CreateWindow("Hello SDL", WIDTH, HEIGHT, SDL_WINDOW_OPENGL);
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if (!window)
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{
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panic("SDL_CreateWindow");
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@ -41,21 +68,73 @@ int main( int argc, char* argv[] )
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panic("SDL_CreateRenderer");
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}
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int orange = 0;
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//SDL_GetWindowSize(window, &width, &height);
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SetTitle(window);
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//if (!SDL_SetRenderVSync(renderer, 1))
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//{
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// panic("SDL_SetRenderVSync");
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//}
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SDL_HideCursor();
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int red = 0;
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int green = 0;
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while (!loopShouldStop)
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{
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SDL_Event e;
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SDL_zero(e);
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while (SDL_PollEvent(&e))
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{
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if (e.type == SDL_EVENT_KEY_DOWN && e.key.mod == SDL_KMOD_LCTRL && e.key.key == SDLK_Q)
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if (e.type == SDL_EVENT_QUIT)
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loopShouldStop = true;
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else if (e.type == SDL_EVENT_KEY_DOWN)
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{
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if (e.key.key == SDLK_X)
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{
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FPS -= 0.1;
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if (FPS < 1)
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{
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FPS = 1;
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}
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FrameTime = 1.0 / FPS;
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SetTitle(window);
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}
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else if (e.key.key == SDLK_C)
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{
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FPS += 0.1;
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FrameTime = 1.0 / FPS;
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SetTitle(window);
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}
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}
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else if (e.key.mod == SDL_KMOD_LCTRL && e.key.key == SDLK_Q)
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loopShouldStop = true;
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}
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SDL_SetRenderDrawColor(renderer, 0, orange, 0, 255);
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SDL_SetRenderDrawColor(renderer, red, green, 0, 255);
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SDL_RenderClear(renderer);
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sleep_time = time_counter - GetTime();
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if (sleep_time * 1000 > delay_threshold)
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{
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Uint32 ms = (Uint32)(sleep_time * 1000) - delay_threshold;
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SDL_Delay(ms);
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if (time_counter < GetTime())
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{
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delay_threshold++;
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SDL_Log("Slept too long. Increased threshold to %u ms.", delay_threshold);
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}
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}
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while (time_counter > GetTime()) {
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/* Waiting for the right moment. */
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}
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SDL_RenderPresent(renderer);
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orange = (orange + 1) % 256;
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red = (red + 1) % 256;
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green = (green + 1) % 64;
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time_counter += FrameTime;
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}
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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