[PATCH 11/13] nv50: add support for light-twoside

[Christoph Bumiller]

---
 src/gallium/drivers/nv50/nv50_program.c |   19 +++++++++++++++++++
 src/gallium/drivers/nv50/nv50_state.c   |    4 +++-
 2 files changed, 22 insertions(+), 1 deletions(-)

diff --git a/src/gallium/drivers/nv50/nv50_program.c b/src/gallium/drivers/nv50/nv50_program.c
index feb1504..39c3afc 100644
--- a/src/gallium/drivers/nv50/nv50_program.c
+++ b/src/gallium/drivers/nv50/nv50_program.c
@@ -2048,6 +2048,11 @@ nv50_program_tx_prep(struct nv50_pc *pc)
 
 				si = d->Semantic.SemanticIndex;
 				switch (d->Semantic.SemanticName) {
+				case TGSI_SEMANTIC_BCOLOR:
+					p->cfg.two_side[si].hw_id = first;
+					if (p->cfg.io_nr > first)
+						p->cfg.io_nr = first;
+					break;
 					/*
 				case TGSI_SEMANTIC_CLIP_DISTANCE:
 					p->cfg.clpd = MIN2(p->cfg.clpd, first);
@@ -2125,6 +2130,11 @@ nv50_program_tx_prep(struct nv50_pc *pc)
 				p->cfg.io[i].mask |= 1 << c;
 			}
 		}
+
+		for (c = 0; c < 2; ++c)
+			if (p->cfg.two_side[c].hw_id < 0x40)
+				p->cfg.two_side[c] = p->cfg.io[
+					p->cfg.two_side[c].hw_id];
 	} else
 	if (p->type == PIPE_SHADER_FRAGMENT) {
 		int rid, aid;
@@ -2726,6 +2736,15 @@ nv50_linkage_validate(struct nv50_context *nv50)
 	}
 
 	reg[0] += (m - 4) << 8; /* adjust BFC0 id */
+
+	/* if VP writes any back-face colour, use separate slots */
+	if (vp->cfg.two_side[0].mask | vp->cfg.two_side[1].mask) {
+		vpo = &vp->cfg.two_side[0];
+
+		m = nv50_sreg4_map(map, m, lin, &fp->cfg.two_side[0], &vpo[0]);
+		m = nv50_sreg4_map(map, m, lin, &fp->cfg.two_side[1], &vpo[1]);
+	}
+
 	reg[0] += m - 4; /* adjust FFC0 id */
 	reg[4] |= m << 8; /* set mid where 'normal' FP inputs start */
 
diff --git a/src/gallium/drivers/nv50/nv50_state.c b/src/gallium/drivers/nv50/nv50_state.c
index 4283808..20d9f43 100644
--- a/src/gallium/drivers/nv50/nv50_state.c
+++ b/src/gallium/drivers/nv50/nv50_state.c
@@ -264,7 +264,6 @@ nv50_rasterizer_state_create(struct pipe_context *pipe,
 		CALLOC_STRUCT(nv50_rasterizer_stateobj);
 
 	/*XXX: ignored
-	 * 	- light_twosize
 	 * 	- point_smooth
 	 * 	- multisample
 	 * 	- point_sprite / sprite_coord_mode
@@ -276,6 +275,9 @@ nv50_rasterizer_state_create(struct pipe_context *pipe,
 	so_method(so, tesla, 0x1684, 1);
 	so_data  (so, cso->flatshade_first ? 0 : 1);
 
+	so_method(so, tesla, NV50TCL_VERTEX_TWO_SIDE_ENABLE, 1);
+	so_data  (so, cso->light_twoside);
+
 	so_method(so, tesla, NV50TCL_LINE_WIDTH, 1);
 	so_data  (so, fui(cso->line_width));
 	so_method(so, tesla, NV50TCL_LINE_SMOOTH_ENABLE, 1);
-- 
1.6.3.3


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