game_time.c


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#include <SDL2/SDL.h>
#include "./constants.h"

int last_frame_time = 0;

void delay(void) {
	// logic to keep a fixed timestep
	int time_to_wait = FRAME_TARGET_TIME - (SDL_GetTicks() - last_frame_time);
	
	if(time_to_wait > 0 && time_to_wait <= FRAME_TARGET_TIME) {
		SDL_Delay(time_to_wait);
	}
}

float get_delta_time() {
	// get a delta time factor converted to seconds
	float delta_time = (SDL_GetTicks() - last_frame_time) / 1000.0f;

	last_frame_time = SDL_GetTicks();
	return delta_time;
}