[Dri-devel] new tdfx-2-1-branch check-ins

[Brian P. <br...@va...>]

I've just checked in some changes to the tdfx-2-1-branch:

1. GLX context sharing now works.  Display lists and texture objects
   can now be shared between direct rendering contexts.


2. Enabled Voodoo5 UMA texture memory.  On the Voodoo3, texture
   memory was divided into two banks.  On Voodoo5, texture memory
   can be configured as one large pool.  This allows one to use
   really large textures (2K x 2K x 4byte/texel) and in some cases
   allows more textures to be coresident at once.

   I haven't exhaustively tested the UMA changes so there might
   be a bug or two.  Remember, this is a development branch.


3. On Voodoo3, any possible texture size and format could always
   fit into texture memory since you were limited to 256 x 256 x 2byte/texel
   images (128K).  But on Voodoo5 there will not be enough memory to
   store a 2K x 2K x 4byte/texel image if you're running your screen
   at 1600x1200x32, for example.  But, a 2K x 2K x 2byte/texel image
   would fit.  Therefore I had to implement complete support for
   proxy textures (See the OpenGL Programming Guide).

   Note that texture proxies don't completely solve the problem of
   determining if your textures will actually fit in memory.  The
   problem is multi-texturing.  There may be enough memory to store
   one 2K x 2K x 4byte/texel image, but not two of them for multi-
   texture.  There's no way to detect this problem with proxies.

   Allen Akin is working on a memory/resource allocation extension
   which would solve this problem.  But until we have that, you'll
   have to be careful about using large textures.

-Brian