From: Christoph Bumiller <e0425955@student.tuwien.ac.at>
Date: Sun, 10 Apr 2011 11:55:01 +0000 (+0200)
Subject: nvc0: force perspective correction hint to nicest
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d546df4d9c090656c506e8a959646a48ed00efc2;p=mesa.git

nvc0: force perspective correction hint to nicest

Fixes issues in e.g. nexuiz (desertfactory) or supertuxkart that
look like lighting bugs.

They're not visible with the software rasterizers because their
notion of linear interpolation seems to be different from that
of nv50/nvc0.
---

diff --git a/src/gallium/drivers/nvc0/nvc0_pc_emit.c b/src/gallium/drivers/nvc0/nvc0_pc_emit.c
index 76ad40dbcf8..6f409a9e925 100644
--- a/src/gallium/drivers/nvc0/nvc0_pc_emit.c
+++ b/src/gallium/drivers/nvc0/nvc0_pc_emit.c
@@ -715,6 +715,10 @@ emit_interp(struct nv_pc *pc, struct nv_instruction *i)
    if (i->opcode == NV_OP_PINTERP) {
       pc->emit[0] |= 0x040;
       SID(pc, i->src[1], 26);
+
+      if (i->src[0]->value->reg.address >= 0x280 &&
+          i->src[0]->value->reg.address <= 0x29c)
+         pc->emit[0] |= 0x080; /* XXX: ? */
    } else {
       SID(pc, NULL, 26);
    }
diff --git a/src/gallium/drivers/nvc0/nvc0_program.c b/src/gallium/drivers/nvc0/nvc0_program.c
index 3c59213176e..383bc30f20b 100644
--- a/src/gallium/drivers/nvc0/nvc0_program.c
+++ b/src/gallium/drivers/nvc0/nvc0_program.c
@@ -224,6 +224,9 @@ nvc0_interp_mode(const struct tgsi_full_declaration *decl)
    else
    if (decl->Declaration.Interpolate == TGSI_INTERPOLATE_PERSPECTIVE)
       mode = NVC0_INTERP_PERSPECTIVE;
+   else
+   if (decl->Declaration.Semantic && decl->Semantic.Name == TGSI_SEMANTIC_COLOR)
+      mode = NVC0_INTERP_PERSPECTIVE;
    else
       mode = NVC0_INTERP_LINEAR;