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My code displays a fully transparent window that copies the background from the operating system.

Window copies the OS background rendering

This is the code I use for rendering:

void render()
{
    SDL_RenderClear(renderer);
    SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
    SDL_RenderDrawRect(renderer, &background);
    SDL_RenderPresent(renderer);
}

And this is the code I use to create my window:

window = SDL_CreateWindow("title", posX, posY, windowWidth, windowHeight, SDL_WINDOW_OPENGL);
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  • \$\begingroup\$ There are some issues with this question: the issue at hand is badly described, could you post some screenshots of the issue? It's not clear in the description what you're trying to achieve. There seems to be a lot of unnecessary code; trim that down to only what's important for the question. -- Please edit the question. \$\endgroup\$
    – Vaillancourt
    Commented Mar 6, 2016 at 13:37

1 Answer 1

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The problem is that you are passing the SDL_WINDOW_OPENGL flag to your window in SDL_CreateWindow, but then you are using the SDL_Renderer for rendering. You need to remove the flag for SDL_Renderer to function properly.

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