Re: wined3d: Allow vertex shaders to generate GLSL shaders [Take Two]

[Ivan Gyurdiev]

Jason Green wrote:
> This is a resend of the earlier patch, with one addition:
> - previously, the line to alias the program.env[] to C[] was done in
> the vertex shaders since that was the only function that needed them
> (and it needs to be done to support relative addressing).  However,
> with PS 2.0+, pixel shaders now need to be able to use relative
> addressing as well.  This can't be done with ARB_fragment_program, but
> it can be done with GLSL, so for consistency, we are now aliasing the
> program.env[] array to C[] for both ps & vs.
> I think I've mislead you here (sorry)... the relative addressing on PS 
> 3.0+ is on input registers, against aL, not on constants. I think it 
> allows you to read the inputs in a loop against the loop counter. 
> According to spec, pixel shader constants still do not allow relative 
> addressing. So, this constant aliasing thing... we likely don't need 
> this in pixel shaders. However, I still think that it'd be nice to use 
> the same names (so we can share more code), and put this kind of 
> initialization in baseshader if possible. From that point of view I 
> agree w/ the patch, as long as nothing breaks.