kc3-lang/SDL

2020-04-13T14:44:21

opengl: Allow SDL_GL_MakeCurrent() to accept a NULL window (thanks, Martin!). This allows you to bind surfaceless contexts on a background thread to, for example, load assets in a separate context, for platforms that have different requirements about sharing surfaces, etc. Martin's notes on the matter: "Here's a patch that enables passing NULL windows to SDL_GL_MakeCurrent, if the involved APIs allow it. Currently, this is only the case for EGL, and even then only if some specific extensions are present (which they usually are). If "surfaceless" contexts are not supported, SDL_GL_MakeCurrent continues to generate an error (albeit with a more specific error message than it used to), so this should not break anything that wasn't broken before." (Please see https://bugzilla.libsdl.org/show_bug.cgi?id=3695 for more discussion.) Fixes Bugzilla #3695.