[SDL] SDL_OPENGLBLIT

[Mattias Engdegård]

>BTW, the code relies on OpenGL 1.2 for GL_UNSIGNED_SHORT_565. This is no
>problem on Linux but I don't know (and care) about which version of
>OpenGL comes with MSVC...

Why not surround it with #ifdefs then. This Solaris box doesn't have it,
and others might not either.

(argh, these diffs are hopeless to read. unified, please!)

>< 		SDL_VideoSurface = SDL_CreateRGBSurface(
>< 			flags, 
>< 			width, 
>< 			height, 
>< 			32, 
>< 			0x000000FF,
>< 			0x0000FF00,
>< 			0x00FF0000,
>< 			0xFF000000
>< 			);

This is b0rken on big-endian machines. (I think it was in the original too.)
(Thanks to people on #sdl who helped me understand that the order is always
RGBA regardless of byte sex.) The rgb565 code seems fine.