sdl2_renderer

#include <stdio.h>
#include <SDL.h>

#undef main
int main()
{

    SDL_Window* window = NULL;
    SDL_Renderer* renderer = NULL;
    SDL_Surface* tempSurface = NULL;
    SDL_Texture* texture = NULL;
    SDL_Event mainEvent;
    SDL_Rect sourceRect;
    SDL_Rect desRect;
    bool isRunning = true;

    //initializes  the subsystems
    if (SDL_Init(SDL_INIT_EVERYTHING) < 0)
    {
        printf("Unable to initialize SDL %s\n", SDL_GetError());
        return -1;
    }

    //Create window
    window = SDL_CreateWindow("Stdio.vn - SDL", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 640, SDL_WINDOW_SHOWN);
    if (window == NULL)
    {
        printf("Could not create window %s", SDL_GetError());
        return -1;
    }


    //create a renderer
    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
    if (renderer == NULL)
    {
        printf("Could not create render %s", SDL_GetError());
        return -1;
    }

    //create a tempSurface
    tempSurface = SDL_LoadBMP("texture_demo.bmp");
    //create a texutre from surface
    texture = SDL_CreateTextureFromSurface(renderer, tempSurface);
    //free surface
    SDL_FreeSurface(tempSurface);


    SDL_QueryTexture(texture, NULL, NULL, &sourceRect.w, &sourceRect.h);

    sourceRect.x = 0;
    sourceRect.y = 0;
    sourceRect.w = sourceRect.w / 2;
    sourceRect.h = sourceRect.h / 2;

    desRect.x = 200;
    desRect.y = 200;
    desRect.w = sourceRect.w;
    desRect.h = sourceRect.h;

    //set background color
    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);

    //main loop
    while (isRunning)
    {
        // clear the window to black
        SDL_RenderClear(renderer);
        //main event
        while (SDL_PollEvent(&mainEvent))
        {
            switch (mainEvent.type)
            {
                //User - requested quit
                case SDL_QUIT:
                {
                    isRunning = false;
                    break;
                }
                default:
                {
                    break;
                }
            }
        }

        // copy a portion of the texture to the current rendering target.
        SDL_RenderCopy(renderer, texture, &sourceRect, NULL);
        //draw to the screen
        SDL_RenderPresent(renderer);
    }

    //Destroy a window.
    SDL_DestroyWindow(window);

    //Destroy a renderer
    SDL_DestroyRenderer(renderer);

    //cleans up all initialized subsystems
    SDL_Quit();
    return 0;
}