c++ sdl2 window code

#include "main.h"

namespace fs = std::experimental::filesystem;

int initProg(SDL_Window *&window, SDL_Renderer *&renderer); // starts sdl2, creates main window & renderer

const char* WINDOW_TITLE = "Testing";

int main(){
    SDL_Window* gWindow = NULL;
    SDL_Renderer* gRenderer = NULL;
    if (initProg(gWindow, gRenderer) != 0){
        return 1;
    }
    atexit(SDL_Quit);

    std::string imagePath = fs::current_path() / "assets/hello.png";
    SDL_Texture* helloImage = loadImage(imagePath, gRenderer);

    SDL_Event e;
    while(1){ // main loop
        while(SDL_PollEvent(&e) != 0){ // gets latest event in a poll and removes it from said poll. returns 0 if there are no events in poll
            if (e.type == SDL_QUIT){
                cleanupSDL(helloImage, gRenderer, gWindow);
                return 0;
            }
        }
        SDL_RenderClear(gRenderer); // flushes screen
        renderSDLTexture(helloImage, gRenderer, 10, 10);
        SDL_RenderPresent(gRenderer); // updates screen
    }
}

int initProg(SDL_Window *&window, SDL_Renderer *&renderer){
    if (SDL_Init(SDL_INIT_VIDEO) < 0){
        logSDLError(std::cout, "Init");
        return 1;
    }

    if ((IMG_Init(IMG_INIT_PNG) & IMG_INIT_PNG) != IMG_INIT_PNG){ // IMG_Init returns a bitmask of the initialized format loaders, we bitwise AND it and check if png was loaded.
        std::cout << "IMG_Init error: " << IMG_GetError() << std::endl;
        return 1;
    }
    atexit(IMG_Quit);

    window = SDL_CreateWindow(WINDOW_TITLE, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
    if (!window){
        logSDLError(std::cout, "CreateWindow");
        return 1;
    }

    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC); // creates renderer with hardware acceleration & vsync
    if (!renderer){
        logSDLError(std::cout, "CreateRenderer");
        cleanupSDL(window);
        return 1;
    }
    return 0;
}