[15/20] WineD3D: Clean up drawprim a bit

[Christoph Bumiller]

Stefan Dösinger wrote:
> We will need software shaders for a correct implementation of 
> IWineD3DDevice::ProcessVertices. It supports Vertex shaders, but I 
> don't really think OpenGL feedback mode is what we want here.
>
> Maybe we should remove it for now, but keep the code somewhere(in the 
> wiki maybe). If someone is extra-ambitious we can do something like 
> Softwire/SwiftShader does. But I think ProcessVertices is a good 
> oportunity to verify our vertex shader implementation.
>

Sounds fun *g* ... I thought of generating Intel assembly code from the 
vertex shader bytecode on the fly, just like GLSL and ARB shaders are 
generated, using primarily SSE for doing the floating point 
computations (in situations where it brings an advantage), and directly 
referencing the memory at IWineD3DVertexShaderImpl->data,input,output 
(load constants, input data, store temporary values, store output 
data). Would something like that even be accepted in wine ?

I'm already 'experimenting' a bit, but as I don't have much time these 
days don't count on it to be finished within the next 3 months, or 
ever, after all I might also get so desperate with it and stop working 
on it altogether ... I've never written anything similar before.

The main reason for this mail is to know whether someone else is 
working on a solution for doing software vshaders already, and if so, 
rather invest the time in my other studies (I'm running behind there 
...), before having two people work at the same thing.