Test of SDL2 main loop.

sdl2test.c

#include <stdio.h>
#include <SDL.h>
#include <SDL_image.h>
#include <Windows.h>
#include <time.h>
#include <stdio.h>
 
int main(int argc, char* argv[]) {
        const int WIDTH = 640;
        const int HEIGHT = 480;
        SDL_Window* window = NULL;
        SDL_Renderer* renderer = NULL;
        SDL_Texture* image = NULL;
        SDL_Rect rectImage;
        int w, h;
        int frames = 0;
        clock_t last_tick = clock();
 
        SDL_Init(SDL_INIT_VIDEO);
        window = SDL_CreateWindow("Test", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, WIDTH, HEIGHT, SDL_WINDOW_SHOWN);
        renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
 
        IMG_Init(IMG_INIT_PNG);
        image = IMG_LoadTexture(renderer, "img/boot.png"); // Change as needed
 
        SDL_QueryTexture(image, NULL, NULL, &w, &h);
        rectImage = { 0, 0, w, h };
        bool running = true;
        SDL_Event e;
 
        while (running) {
                while (SDL_PollEvent(&e) != 0)  {
                        if (e.type == SDL_QUIT) {
                                running = false;
                        }
                }
 
                rectImage.x += 4;
                rectImage.y += 4;
 
                if (rectImage.x > WIDTH) rectImage.x = 0;
                if (rectImage.y > HEIGHT) rectImage.y = 0;
 
                SDL_RenderClear(renderer);
                SDL_SetRenderDrawColor(renderer, 200, 0, 0, 255);
 
                SDL_RenderFillRect(renderer, NULL);
 
                SDL_RenderCopy(renderer, image, NULL, &rectImage);
                SDL_RenderPresent(renderer);

                frames++;
                
                clock_t now = clock();
                if (now > (last_tick + CLOCKS_PER_SEC)) 
                {   
                    char buff[52];
                    _snprintf(buff, 52, "%d fps\n", frames);
                    OutputDebugStringA(buff);
                    frames = 0;
                    last_tick = now;
                }
        }
 
        SDL_DestroyTexture(image);
        SDL_DestroyWindow(window);
        SDL_Quit();
        return 0;
}