Xcode-iOS/Template/SDL iOS Application/main.c

/*
 *  rectangles.c
 *  written by Holmes Futrell
 *  use however you want
 */

#include "SDL.h"
#include <time.h>

#define SCREEN_WIDTH 320
#define SCREEN_HEIGHT 480

int
randomInt(int min, int max)
{
    return min + rand() % (max - min + 1);
}

void
render(SDL_Renderer *renderer)
{

    Uint8 r, g, b;

    /* Clear the screen */
    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
    SDL_RenderClear(renderer);

    /*  Come up with a random rectangle */
    SDL_Rect rect;
    rect.w = randomInt(64, 128);
    rect.h = randomInt(64, 128);
    rect.x = randomInt(0, SCREEN_WIDTH);
    rect.y = randomInt(0, SCREEN_HEIGHT);

    /* Come up with a random color */
    r = randomInt(50, 255);
    g = randomInt(50, 255);
    b = randomInt(50, 255);
    SDL_SetRenderDrawColor(renderer, r, g, b, 255);

    /*  Fill the rectangle in the color */
    SDL_RenderFillRect(renderer, &rect);

    /* update screen */
    SDL_RenderPresent(renderer);
}

int
main(int argc, char *argv[])
{

    SDL_Window *window;
    SDL_Renderer *renderer;
    int done;
    SDL_Event event;

    /* initialize SDL */
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        printf("Could not initialize SDL\n");
        return 1;
    }

    /* seed random number generator */
    srand(time(NULL));

    /* create window and renderer */
    window =
        SDL_CreateWindow(NULL, 0, 0, SCREEN_WIDTH, SCREEN_HEIGHT,
                         SDL_WINDOW_OPENGL);
    if (!window) {
        printf("Could not initialize Window\n");
        return 1;
    }

    renderer = SDL_CreateRenderer(window, -1, 0);
    if (!renderer) {
        printf("Could not create renderer\n");
        return 1;
    }

    /* Enter render loop, waiting for user to quit */
    done = 0;
    while (!done) {
        while (SDL_PollEvent(&event)) {
            if (event.type == SDL_QUIT) {
                done = 1;
            }
        }
        render(renderer);
        SDL_Delay(1);
    }

    /* shutdown SDL */
    SDL_Quit();

    return 0;
}