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...ng D3DCompiler) DLLs. Most games therefore end up using D3DX to > compile their Direct3D shaders. > > Microsoft seems to have paid no attention to optimization of the > resulting shader code, though. With LLVM, we can do better. > Do you have any sources for this? In my experience, fxc is able to do some clever tricks such as replacing if-then-else conditions with predicated instructions and swizzles. > > By using LLVM's optimizers, programs can potentially generate > high-performance shader code that works well on the platform on which > they are running. In ad...

...st games therefore end up using D3DX to > compile their Direct3D shaders. > > Microsoft seems to have paid no attention to optimization of the > resulting shader code, though. With LLVM, we can do better. > > > Do you have any sources for this? In my experience, fxc is able to do > some clever tricks such as replacing if-then-else conditions with > predicated instructions and swizzles. I heard rumors that drivers tend not to like highly optimized bytecode input. But that seems to count against optimization. I could take that part out. > > >...

Here's the other of my proposals for this year's Google Summer of Code. (The first is on cfe-dev.) It was suggested to me by Dan Kegel (from the Wine project, they really want this). Title: Microsoft Direct3D shader bytecode backend Abstract: There is a distinct lack of open-source frameworks for compiling HLSL, the shader language used by Direct3D, into bytecode that D3D can

...using D3DX to >> compile their Direct3D shaders. >> >> Microsoft seems to have paid no attention to optimization of the >> resulting shader code, though. With LLVM, we can do better. >> >> >> Do you have any sources for this? In my experience, fxc is able to do >> some clever tricks such as replacing if-then-else conditions with >> predicated instructions and swizzles. > I heard rumors that drivers tend not to like highly optimized bytecode > input. But that seems to count against optimization. I could take that > part o...