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Add change Frame time POG

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CRy386i 2024-11-25 03:37:08 +02:00
parent 010f6799ee
commit b30e525d69
1 changed files with 91 additions and 12 deletions
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103
main.c
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@ -4,58 +4,137 @@
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h> // only include this one in the source file with main()!
#define INITIAL_FPS 60
SDL_Window* window = NULL;
SDL_Renderer* renderer = NULL;
static double FPS = INITIAL_FPS;
static double FrameTime = 1.0 / INITIAL_FPS;
static double PerformancePeriod;
static void panic ( const char *text ) __attribute__((noreturn));
static double GetTime()
{
return PerformancePeriod * SDL_GetPerformanceCounter();
}
static void SetTitle(SDL_Window * window)
{
char title[48] = {0};
SDL_snprintf(title, sizeof(title), "Crude frame limiter @ %6.3f Hz", FPS);
SDL_SetWindowTitle(window, title);
}
void panic ( const char *text )
{
fprintf(stderr, "ERROR: %s. %s\n", text, SDL_GetError());
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
exit(1);
fprintf(stderr, "ERROR: %s. %s\n", text, SDL_GetError());
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
exit(1);
}
int main( int argc, char* argv[] )
{
const int WIDTH = 640;
const int HEIGHT = 480;
int delay_threshold = 2;
double sleep_time;
double time_counter = 0;
bool loopShouldStop = false;
SDL_SetHint(SDL_HINT_RENDER_VSYNC, 0);
if (!SDL_Init(SDL_INIT_VIDEO))
{
panic("SDL_Init failed");
}
window = SDL_CreateWindow("Hello SDL", WIDTH, HEIGHT, 0);
if (!window)
PerformancePeriod = 1.0 / SDL_GetPerformanceFrequency();
time_counter = GetTime();
window = SDL_CreateWindow("Hello SDL", WIDTH, HEIGHT, SDL_WINDOW_OPENGL);
if (!window)
{
panic("SDL_CreateWindow");
}
renderer = SDL_CreateRenderer(window, "opengl");
if (!renderer)
if (!renderer)
{
panic("SDL_CreateRenderer");
}
int orange = 0;
//SDL_GetWindowSize(window, &width, &height);
SetTitle(window);
//if (!SDL_SetRenderVSync(renderer, 1))
//{
// panic("SDL_SetRenderVSync");
//}
SDL_HideCursor();
int red = 0;
int green = 0;
while (!loopShouldStop)
{
SDL_Event e;
SDL_zero(e);
while (SDL_PollEvent(&e))
{
if (e.type == SDL_EVENT_KEY_DOWN && e.key.mod == SDL_KMOD_LCTRL && e.key.key == SDLK_Q)
if (e.type == SDL_EVENT_QUIT)
loopShouldStop = true;
else if (e.type == SDL_EVENT_KEY_DOWN)
{
if (e.key.key == SDLK_X)
{
FPS -= 0.1;
if (FPS < 1)
{
FPS = 1;
}
FrameTime = 1.0 / FPS;
SetTitle(window);
}
else if (e.key.key == SDLK_C)
{
FPS += 0.1;
FrameTime = 1.0 / FPS;
SetTitle(window);
}
}
else if (e.key.mod == SDL_KMOD_LCTRL && e.key.key == SDLK_Q)
loopShouldStop = true;
}
SDL_SetRenderDrawColor(renderer, 0, orange, 0, 255);
SDL_SetRenderDrawColor(renderer, red, green, 0, 255);
SDL_RenderClear(renderer);
sleep_time = time_counter - GetTime();
if (sleep_time * 1000 > delay_threshold)
{
Uint32 ms = (Uint32)(sleep_time * 1000) - delay_threshold;
SDL_Delay(ms);
if (time_counter < GetTime())
{
delay_threshold++;
SDL_Log("Slept too long. Increased threshold to %u ms.", delay_threshold);
}
}
while (time_counter > GetTime()) {
/* Waiting for the right moment. */
}
SDL_RenderPresent(renderer);
orange = (orange + 1) % 256;
red = (red + 1) % 256;
green = (green + 1) % 64;
time_counter += FrameTime;
}
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);