gistfile1.txt

#include <SDL.h>
#include <windows.h>

#include <cstdint>

void Win32_DEBUG_DrawScreenBuffer(void* pixels, int width, int height, int pitch) {
    uint8_t* row = reinterpret_cast<uint8_t*>(pixels);
    for (int y = 0; y < height; ++y) {
        uint32_t* pixel = reinterpret_cast<uint32_t*>(row);
        for (int x = 0; x < width; ++x) {
            uint8_t blue = static_cast<uint8_t>(x);
            uint8_t green = static_cast<uint8_t>(y);

            *pixel++ = (green << 16) | blue;
        }

        row += pitch;
    }
}

int CALLBACK WinMain(HINSTANCE Instance, HINSTANCE PrevInstance, LPSTR CommandLine, int ShowCode) {
    SDL_Window* window;
    SDL_Surface* screen;

    if (SDL_Init(SDL_INIT_EVERYTHING) != 0) {
        return 1;
    }

    window = SDL_CreateWindow("An SDL2 window", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
                              1280, 720, SDL_WINDOW_OPENGL);
    if (!window) {
        return 1;
    }

    screen = SDL_GetWindowSurface(window);
    if (!screen) {
        return 1;
    }

    bool isRunning = true;
    while (isRunning) {
        SDL_Event e;
        while (SDL_PollEvent(&e)) {
            if (e.type == SDL_QUIT) {
                isRunning = false;
            }
        }

        Win32_DEBUG_DrawScreenBuffer(screen->pixels, screen->w, screen->h, screen->pitch);

        SDL_UpdateWindowSurface(window);
    }

    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}