SDL2 basic blitting

SDL2-blitting.cpp

void init() // once
{
  constexpr int WIDTH = XXX;
  constexpr int HEIGHT = XXX;
  
  SDL_Surface* _output = SDL_CreateRGBSurface(0, WIDTH, HEIGHT, 32, format->Rmask, format->Gmask, format->Bmask, format->Amask);
  SDL_Texture* _outputTexture = SDL_CreateTexture(renderer, format->format, SDL_TEXTUREACCESS_STREAMING, WIDTH, HEIGHT);
  
  SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
}

void render()
{
  SDL_RenderClear(renderer);
  
  emulator.blitOnSurface(_output);
  SDL_UpdateTexture(_outputTexture, nullptr, _output->pixels, _output->pitch);
  SDL_RenderCopy(renderer, _outputTexture, nullptr, &dest);
  
  SDL_RenderPresent(renderer);
}