Messages in this thread | | | Date | Thu, 01 Sep 2005 18:26:42 +0100 | From | Keith Whitwell <> | Subject | Re: State of Linux graphics |
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Ian Romanick wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Brian Paul wrote: > > >>It's other (non-orientation) texture state I had in mind: >> >>- the texel format (OpenGL has over 30 possible texture formats). >>- texture size and borders >>- the filtering mode (linear, nearest, etc) >>- coordinate wrap mode (clamp, repeat, etc) >>- env/combine mode >>- multi-texture state > > > Which is why it's such a good target for code generation. You'd > generate the texel fetch routine, use that to generate the wraped texel > fetch routine, use that to generate the filtered texel fetch routine, > use that to generate the env/combine routines. > > Once-upon-a-time I had the first part and some of the second part > written. Doing just that little bit was slightly faster on a Pentium 3 > and slightly slower on a Pentium 4. I suspect the problem was that I > wasn't caching the generated code smart enough, so it was it trashing > the CPU cache. The other problem is that, in the absence of an > assembler in Mesa, it was really painful to change the code stubs.
Note that the last part is now partially addressed at least - Mesa has an integrated and simple runtime assembler for x86 and sse. There are some missing pieces and rough edges, but it's working and useful as it stands.
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