game/window.cpp

#include "window.hpp"

#include <cstdlib>
#include <iostream>

#include <SDL2/SDL_image.h>

SDL_Window *window;
SDL_Renderer *renderer;

int sdl2Initialize()
{
    if (auto err = SDL_Init(SDL_INIT_VIDEO); err < 0) {
        std::cerr << "SDL error: " << SDL_GetError() << std::endl;
        return EXIT_FAILURE;
    } else {
        atexit(SDL_Quit);
    }

    if (!(IMG_Init(IMG_INIT_PNG) & IMG_INIT_PNG)) {
        std::cerr << "IMG error: " << IMG_GetError() << std::endl;
        return EXIT_FAILURE;
    } else {
        atexit(IMG_Quit);
    }

    window = SDL_CreateWindow("game",
        SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 
        WINDOW_WIDTH, WINDOW_HEIGHT,
        SDL_WINDOW_SHOWN);

    if (window == nullptr) {
        std::cerr << "SDL error: " << SDL_GetError() << std::endl;
        return EXIT_FAILURE;
    } else {
        atexit([] { SDL_DestroyWindow(window); });
    }

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

    if (renderer == nullptr) {
        std::cerr << "SDL error: " << SDL_GetError() << std::endl;
        return EXIT_FAILURE;
    } else {
        atexit([] { SDL_DestroyRenderer(renderer); });
    }

    return 0;
}

SDL_Texture *sdl2LoadTexture(const char *path)
{
    SDL_Texture *tex = nullptr;

    auto surface = IMG_Load(path);
    if (surface == nullptr) {
        std::cerr << "Unable to load image " << path << '!' << std::endl;
        std::cerr << "SDL error: " << IMG_GetError() << std::endl;
    } else {
        tex = SDL_CreateTextureFromSurface(renderer, surface);

        if (tex == nullptr) {
            std::cerr << "Unable to create texture for " << path << '!' << std::endl;
            std::cerr << "SDL error: " << SDL_GetError() << std::endl;
        } else {
            SDL_FreeSurface(surface);
        }
    }

    return tex;
}