sdl2_example.cpp

#include <iostream>
#include <SDL.h>

void draw(SDL_Window * window, SDL_Renderer * renderer) {
    int w, h;
    SDL_GetWindowSize(window, &w, &h);

    for (int y = 0; y < h; ++y) {
        for (int x = 0; x < w; ++x) {
            //srand(x * y);
            auto clr = rand();
            SDL_SetRenderDrawColor(renderer, (clr >> 16) & 0xff, (clr >> 8) & 0xff, (clr >> 0) & 0xff, 255);

            SDL_Rect rect;
            rect.x = x;
            rect.y = y;
            rect.w = 1;
            rect.h = 1;

            //SDL_RenderDrawRect(renderer, &rect);
            SDL_RenderFillRect(renderer, &rect);
        }
    }

    SDL_RenderPresent(renderer);
}

int main() {
    std::cout << "Hello, World!" << std::endl;

    SDL_Init(SDL_INIT_EVERYTHING);

    auto window = ::SDL_CreateWindow("yuigame", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 800, 600, ::SDL_WINDOW_ALLOW_HIGHDPI);

    auto renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);

    float ddpi, hdpi, vdpi;
    auto num = SDL_GetNumVideoDisplays();
    auto result = SDL_GetDisplayDPI(0, &ddpi, &hdpi, &vdpi);
    //SDL_RenderDrawRect(renderer, &rect);

    //asm("int $3");

    while(true) {
        SDL_Event event;
        SDL_PollEvent(&event);
        if(event.type == SDL_QUIT) {
            break;
        }

        draw(window, renderer);
    }

    SDL_Quit();
    return 0;
}