nv50: match VP outputs to FP inputs ourselves

For each FP input, don't assume that the VP output will be
at the same position, but scan the semantics instead, then
put the correct output reg indices into VP_RESULT_MAP.

Position is still assumed to be the first output/input.

See 07fafc7c9346aa260829603bf3188596481e9e62, which renders
previous assumptions incorrect.

2 files changed, 40 insertions, 33 deletions

diff --git a/src/gallium/drivers/nv50/nv50_program.c b/src/gallium/drivers/nv50/nv50_program.c
index f93c864c2a2..bad0ace7e55 100644
--- a/src/gallium/drivers/nv50/nv50_program.c
+++ b/src/gallium/drivers/nv50/nv50_program.c
@@ -2643,7 +2643,7 @@ nv50_program_tx_prep(struct nv50_pc *pc)
 
 		for (i = 0, rid = 0; i < pc->result_nr; ++i) {
 			p->cfg.io[i].hw = rid;
-			p->cfg.io[i].id_vp = i;
+			p->cfg.io[i].id = i;
 
 			for (c = 0; c < 4; ++c) {
 				int n = i * 4 + c;
@@ -2675,14 +2675,12 @@ nv50_program_tx_prep(struct nv50_pc *pc)
 		 * the lower hardware IDs, so sort them:
 		 */
 		for (i = 0; i < pc->attr_nr; i++) {
-			if (pc->interp_mode[i] == INTERP_FLAT) {
-				p->cfg.io[m].id_vp = i + base;
-				p->cfg.io[m++].id_fp = i;
-			} else {
+			if (pc->interp_mode[i] == INTERP_FLAT)
+				p->cfg.io[m++].id = i;
+			else {
 				if (!(pc->interp_mode[i] & INTERP_PERSPECTIVE))
 					p->cfg.io[n].linear = TRUE;
-				p->cfg.io[n].id_vp = i + base;
-				p->cfg.io[n++].id_fp = i;
+				p->cfg.io[n++].id = i;
 			}
 		}
 
@@ -2694,7 +2692,7 @@ nv50_program_tx_prep(struct nv50_pc *pc)
 
 		for (n = 0; n < pc->attr_nr; ++n) {
 			p->cfg.io[n].hw = rid = aid;
-			i = p->cfg.io[n].id_fp;
+			i = p->cfg.io[n].id;
 
 			if (p->info.input_semantic_name[n] ==
 			    TGSI_SEMANTIC_FACE) {
@@ -2734,8 +2732,8 @@ nv50_program_tx_prep(struct nv50_pc *pc)
 		for (i = 0; i < pc->attr_nr; i++) {
 			ubyte si, sn;
 
-			sn = p->info.input_semantic_name[p->cfg.io[i].id_fp];
-			si = p->info.input_semantic_index[p->cfg.io[i].id_fp];
+			sn = p->info.input_semantic_name[p->cfg.io[i].id];
+			si = p->info.input_semantic_index[p->cfg.io[i].id];
 
 			if (sn == TGSI_SEMANTIC_COLOR) {
 				p->cfg.two_side[si] = p->cfg.io[i];
@@ -3237,15 +3235,15 @@ nv50_pntc_replace(struct nv50_context *nv50, uint32_t pntc[8], unsigned base)
 	struct nv50_program *vp = nv50->vertprog;
 	unsigned i, c, m = base;
 
-	/* XXX: This can't work correctly in all cases yet, we either
-	 * have to create TGSI_SEMANTIC_PNTC or sprite_coord_mode has
-	 * to be per FP input instead of per VP output
+	/* XXX: this might not work correctly in all cases yet - we'll
+	 * just assume that an FP generic input that is not written in
+	 * the VP is PointCoord.
 	 */
 	memset(pntc, 0, 8 * sizeof(uint32_t));
 
 	for (i = 0; i < fp->cfg.io_nr; i++) {
 		uint8_t sn, si;
-		uint8_t j = fp->cfg.io[i].id_vp, k = fp->cfg.io[i].id_fp;
+		uint8_t j, k = fp->cfg.io[i].id;
 		unsigned n = popcnt4(fp->cfg.io[i].mask);
 
 		if (fp->info.input_semantic_name[k] != TGSI_SEMANTIC_GENERIC) {
@@ -3253,10 +3251,16 @@ nv50_pntc_replace(struct nv50_context *nv50, uint32_t pntc[8], unsigned base)
 			continue;
 		}
 
-		sn = vp->info.input_semantic_name[j];
-		si = vp->info.input_semantic_index[j];
+		for (j = 0; j < vp->info.num_outputs; ++j) {
+			sn = vp->info.output_semantic_name[j];
+			si = vp->info.output_semantic_index[j];
 
-		if (j < fp->cfg.io_nr && sn == TGSI_SEMANTIC_GENERIC) {
+			if (sn == fp->info.input_semantic_name[k] &&
+			    si == fp->info.input_semantic_index[k])
+				break;
+		}
+
+		if (j < vp->info.num_outputs) {
 			ubyte mode =
 				nv50->rasterizer->pipe.sprite_coord_mode[si];
 
@@ -3344,20 +3348,24 @@ nv50_linkage_validate(struct nv50_context *nv50)
 	reg[0] += m - 4; /* adjust FFC0 id */
 	reg[4] |= m << 8; /* set mid where 'normal' FP inputs start */
 
-	i = 0;
-	if (fp->info.input_semantic_name[0] == TGSI_SEMANTIC_POSITION)
-		i = 1;
-	for (; i < fp->cfg.io_nr; i++) {
-		ubyte sn = fp->info.input_semantic_name[fp->cfg.io[i].id_fp];
-		ubyte si = fp->info.input_semantic_index[fp->cfg.io[i].id_fp];
-
-		n = fp->cfg.io[i].id_vp;
-		if (n >= vp->cfg.io_nr ||
-		    vp->info.output_semantic_name[n] != sn ||
-		    vp->info.output_semantic_index[n] != si)
-			vpo = &dummy;
-		else
-			vpo = &vp->cfg.io[n];
+	for (i = 0; i < fp->cfg.io_nr; i++) {
+		ubyte sn = fp->info.input_semantic_name[fp->cfg.io[i].id];
+		ubyte si = fp->info.input_semantic_index[fp->cfg.io[i].id];
+
+		/* position must be mapped first */
+		assert(i == 0 || sn != TGSI_SEMANTIC_POSITION);
+
+		/* maybe even remove these from cfg.io */
+		if (sn == TGSI_SEMANTIC_POSITION || sn == TGSI_SEMANTIC_FACE)
+			continue;
+
+		/* VP outputs and vp->cfg.io are in the same order */
+		for (n = 0; n < vp->info.num_outputs; ++n) {
+			if (vp->info.output_semantic_name[n] == sn &&
+			    vp->info.output_semantic_index[n] == si)
+				break;
+		}
+		vpo = (n < vp->info.num_outputs) ? &vp->cfg.io[n] : &dummy;
 
 		m = nv50_sreg4_map(map, m, lin, &fp->cfg.io[i], vpo);
 	}
diff --git a/src/gallium/drivers/nv50/nv50_program.h b/src/gallium/drivers/nv50/nv50_program.h
index d78dee083f1..255c7c737ef 100644
--- a/src/gallium/drivers/nv50/nv50_program.h
+++ b/src/gallium/drivers/nv50/nv50_program.h
@@ -17,8 +17,7 @@ struct nv50_program_exec {
 
 struct nv50_sreg4 {
 	uint8_t hw;
-	uint8_t id_vp;
-	uint8_t id_fp;
+	uint8_t id; /* tgsi index, nv50 needs them sorted: flat ones last */
 
 	uint8_t mask;
 	boolean linear;