Port SDL 1.3 to the Nintendo DS
by Darren Alton, mentored by Sam Lantinga
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Using the following sequence
SDL_Init(..:)
SDL_CreateWindow(..., SDL_WINDOW_OPENGL)
SDL_DestroyWindow
SDL_CreateWindow(..., SDL_WINDOW_OPENGL)
SDL will crash in X11_GL_GetVisual. This is due to the fact that
during SDL_DestroyWindow X11_GL_Shutdown was called because the last window
has been closed.
On the next call to SDL_CreateWindow the library is still loaded and only the
memory is reinitialized. Function pointers such as gl_data->glXChooseVisual
will not be reinitialized.
Consequently, SDL will crash due to a NULL pointer access.
The attached patch corrects the behaviour.
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working earlier this week.
I added some more trace code to SDL_x11events.c
In SDL_X11opengl.c I modified SDL_GL_GetSwapInterval() so that it returns a pretty good value even if you have the SGI swap extension instead of the MESA swap
extension. I just saved the value you set and return it too you.
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One of the error was the result of an unitended recursive call to X11_GL_LoadLibrary which was also fixed.
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is incorrect. The result is that an illegal access is being made in X_PumpEvents when it tries to look up the windows ID of the source of an event. Taking out that
call does not seem to have any effect on the testgl. But, I would be happy if someone else took a look at this problem and found a fix higher up the stack.
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From: Couriersud
Subject: Some SDL1.3 patches
LoadLibrary will call X11_GL_Initialize. If LoadLibrary is called before
a window is created, it will crash since structures are not properly set
up.
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From: "Eyal Lotem"
To: "SDL Mailing List" <sdl@lists.libsdl.org>
Subject: [SDL] Bug in GL_SWAP_CONTROL extension name.
The checked extension name is incorrect.
The attached patch fixes it to the correct name.
I don't think that under any setup, this extension name was ever
correct, which is why its not OR'd against the old check.
This fixes the "tear effect" (vsync problems) I had here with nVidia
GLX drivers.
Eyal
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