[Nouveau] Question on IPA on GM107

[Fernando Sahmkow]

So I'm trying to track an special value in IPA instruction generation.
https://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/drivers/nouveau/codegen/nv50_ir_emit_gm107.cpp#L2561

Register on 0x14 (20) is set to some source on "insn->op == OP_PINTERP"

I have found while emulation that such value can be set sometimes to
FragCoord.w, I don't however know what that value is and how to represent
it on glsl. Do you guys know where does that value come from and what it
means?

-- 
Atentamente,
*Fernando A. Sahmkow*
*Móvil*: +584242280286
*Correo*: fsahmkow27 at gmail.com
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