SDL2 program only works if Renderer is created with SDL_RENDERER_SOFTWARE

Question

I\'ve written a program using C++ and SDL2 which:

1. creates a window
2. gets the window\'s surface
3. creates a renderer for the window
4. rend

Answer 1

Try adding SDL_RENDERER_PRESENTVSYNC to your renderer's flag (Proposed by someone here).

C++ seems to be the programming language you're using but for those looking for a fully working SDL2.0.8-based C program that does not use GetWindowSurface(), please take a look here:

Mainly,

• initWindowAndRenderer
• drawText
• drawImage
• drawVideo
• setBgColor
• drawVideo
• ...

Answer 2

The SDL_GetWindowSurface() header comment specifically prohibits using it with the SDL_Renderer functionality:

/**
 *  \brief Get the SDL surface associated with the window.
 *
 *  \return The window's framebuffer surface, or NULL on error.
 *
 *  A new surface will be created with the optimal format for the window,
 *  if necessary. This surface will be freed when the window is destroyed.
 *
 *  \note You may not combine this with 3D or the rendering API on this window.
 *
 *  \sa SDL_UpdateWindowSurface()
 *  \sa SDL_UpdateWindowSurfaceRects()
 */
extern DECLSPEC SDL_Surface * SDLCALL SDL_GetWindowSurface(SDL_Window * window);

Use SDL_RENDERER_TARGETTEXTURE & SDL_SetRenderTarget() if you want to capture SDL_Renderer output.

You can use SDL_GetRendererInfo() to query a compatible texture format. Or just blast ahead with SDL_PIXELFORMAT_ARGB8888 like testrendertarget.c does and hope for the best :)