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Esta página trata acerca de la etapa de optimización de sombras en nouveau, qué se le puede hacer para él, y como.
- Instrucción combinando (scalar+vector)
- Soporte para cosas como MAD
- postscaling support
- condiciones para escapar accesos de texturas muy difíciles "conditionals to avoid expensive texture access"
{{{TEX t0, blah TEX t1, blah2 MUL t0, t0, t1}}}
- turns into
{{{TEXC t0, blah TEX (NE.xyzw) t1, blah2 MUL t0, t0, t1}}}
loop unrolling (nvidia unrolls small loops (<256 instructions executed iirc))
- try to see if we can make use of the unknown upcode 1 for vtxprogs for cool stuff (it seems to do a lot of stuff)
- try to detect things that vary linearly in the fragment program, and push them in the vertex program
- merge code like this :
{{{ ADD vec1.x, vec2.x ADD vec3.x, vec4.x}}}
- into :
{{{ADD vec1.xy, vec2.xy }}}
- after putting vec3.x in vec1.y, and vec4.x in vec2.y
- NV30/NV40 fragment program outputs overlap temporary registers. The details aren't clear yet, but "temp" 0 is result.color[0]. We also have the ability to write to result.color[1-3], and result.depth (not sure which "temp" overlaps yet). These temps can (and should?) be used up until the point that the result reg is written.