- SDL_Surface is a system memory representation of pixel data
 - SDL_Texture is a video memory representation of pixel data

The concept of SDL_Surface with SDL_HWSURFACE is no longer used.

Separated SDL_Texture types by usage rather than memory type
 - SDL_TEXTUREACCESS_STATIC is for rarely changed pixel data,
   can be placed in video memory.
 - SDL_TEXTUREACCESS_STREAMING is for frequently changing pixel
   data, usually placed in system memory or AGP memory.

Optimized the SDL_compat usage of the OpenGL renderer by only
using one copy of the framebuffer instead of two.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%402584