sdl_helpers.cpp

#include "sdl_helpers.h"

bool initializeSDL(SDL_Window*& win, SDL_Renderer*& ren)
{
    if (SDL_Init(SDL_INIT_VIDEO) !=0)
    {
        logSDLError(std::cout, "SDL Init");
        return false;
    }

    win = SDL_CreateWindow("Hello World", 100, 100, 640, 480, SDL_WINDOW_SHOWN);
    if (win == nullptr)
    {
        logSDLError(std::cout, "SDL_CreateWindow");
        SDL_Quit();
        return false;
    }

    ren = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
    if (ren == nullptr)
    {
        SDL_DestroyWindow(win);
        logSDLError(std::cout, "SDL_CreateRenderer");
        SDL_Quit();
        return false;
    }

    if( (IMG_Init(IMG_INIT_PNG) & IMG_INIT_PNG) != IMG_INIT_PNG)
    {
        logSDLError(std::cout, "IMG_init");
        SDL_Quit();
        return 1;
    }

    return true;
}


void logSDLError(std::ostream &os, const std::string &msg)
{
    os << msg << " Error: " << SDL_GetError() << std::endl;
}

SDL_Texture* loadTexture(const std::string &path, SDL_Renderer* renderer)
{
    SDL_Texture *texture = IMG_LoadTexture(renderer, path.c_str());
    if (texture == nullptr)
    {
        logSDLError(std::cout, "IMG_LoadTexture");
    }
    return texture;
}

void renderTexture(SDL_Texture *texture, SDL_Renderer *renderer, int x, int y)
{
    int w, h;
    SDL_QueryTexture(texture, NULL, NULL, &w, &h);
    renderTexture(texture, renderer, x, y, w, h);
}

void renderTexture(SDL_Texture *texture, SDL_Renderer *renderer, int x, int y, int w, int h)
{
    SDL_Rect dst;
    dst.x = x;
    dst.y = y;
    dst.w = w;
    dst.h = h;

    SDL_RenderCopy(renderer, texture, NULL, &dst);
}