nv50: inspect decl semantic and interpolation mode

Record interpolation mode for attributes while parsing declarations,
and also remember the indices of FP color inputs and FP depth output,
which has to end up in the highest output register.

1 files changed, 74 insertions, 1 deletions

diff --git a/src/gallium/drivers/nv50/nv50_program.c b/src/gallium/drivers/nv50/nv50_program.c
index c73ed08a559..85e54322087 100644
--- a/src/gallium/drivers/nv50/nv50_program.c
+++ b/src/gallium/drivers/nv50/nv50_program.c
@@ -111,6 +111,8 @@ struct nv50_pc {
 	struct nv50_reg *temp_temp[16];
 	unsigned temp_temp_nr;
 
+	unsigned interp_mode[32];
+
 	/* current instruction and total number of insns */
 	unsigned insn_cur;
 	unsigned insn_nr;
@@ -366,6 +368,12 @@ set_immd(struct nv50_pc *pc, struct nv50_reg *imm, struct nv50_program_exec *e)
 	e->inst[1] |= (val >> 6) << 2;
 }
 
+
+#define INTERP_LINEAR		0
+#define INTERP_FLAT			1
+#define INTERP_PERSPECTIVE	2
+#define INTERP_CENTROID		4
+
 static void
 emit_interp(struct nv50_pc *pc, struct nv50_reg *dst,
 	    struct nv50_reg *src, struct nv50_reg *iv)
@@ -1441,12 +1449,19 @@ nv50_program_tx_prep(struct nv50_pc *pc)
 	struct tgsi_parse_context p;
 	boolean ret = FALSE;
 	unsigned i, c;
+	unsigned fcol, bcol, fcrd, depr;
+
+	/* count (centroid) perspective interpolations */
+	unsigned centroid_loads = 0;
+	unsigned perspect_loads = 0;
 
 	/* track register access for temps and attrs */
 	unsigned *r_usage[2];
 	r_usage[0] = NULL;
 	r_usage[1] = NULL;
 
+	depr = fcol = bcol = fcrd = 0xffff;
+
 	tgsi_parse_init(&p, pc->p->pipe.tokens);
 	while (!tgsi_parse_end_of_tokens(&p)) {
 		const union tgsi_full_token *tok = &p.FullToken;
@@ -1467,9 +1482,10 @@ nv50_program_tx_prep(struct nv50_pc *pc)
 		case TGSI_TOKEN_TYPE_DECLARATION:
 		{
 			const struct tgsi_full_declaration *d;
-			unsigned last;
+			unsigned last, first, mode;
 
 			d = &p.FullToken.FullDeclaration;
+			first = d->DeclarationRange.First;
 			last = d->DeclarationRange.Last;
 
 			switch (d->Declaration.File) {
@@ -1480,10 +1496,67 @@ nv50_program_tx_prep(struct nv50_pc *pc)
 			case TGSI_FILE_OUTPUT:
 				if (pc->result_nr < (last + 1))
 					pc->result_nr = last + 1;
+
+				if (!d->Declaration.Semantic)
+					break;
+
+				switch (d->Semantic.SemanticName) {
+				case TGSI_SEMANTIC_POSITION:
+					depr = first;
+					break;
+				default:
+					break;
+				}
+
 				break;
 			case TGSI_FILE_INPUT:
+			{
 				if (pc->attr_nr < (last + 1))
 					pc->attr_nr = last + 1;
+
+				if (pc->p->type != PIPE_SHADER_FRAGMENT)
+					break;
+
+				switch (d->Declaration.Interpolate) {
+				case TGSI_INTERPOLATE_CONSTANT:
+					mode = INTERP_FLAT;
+					break;
+				case TGSI_INTERPOLATE_PERSPECTIVE:
+					mode = INTERP_PERSPECTIVE;
+					break;
+				default:
+					mode = INTERP_LINEAR;
+					break;
+				}
+
+				if (d->Declaration.Semantic) {
+					switch (d->Semantic.SemanticName) {
+					case TGSI_SEMANTIC_POSITION:
+						fcrd = first;
+						break;
+					case TGSI_SEMANTIC_COLOR:
+						fcol = first;
+						mode = INTERP_PERSPECTIVE;
+						break;
+					case TGSI_SEMANTIC_BCOLOR:
+						bcol = first;
+						mode = INTERP_PERSPECTIVE;
+						break;
+					}
+				}
+
+				if (d->Declaration.Centroid) {
+					mode |= INTERP_CENTROID;
+					if (mode & INTERP_PERSPECTIVE)
+						centroid_loads++;
+				} else
+				if (mode & INTERP_PERSPECTIVE)
+					perspect_loads++;
+
+				assert(last < 32);
+				for (i = first; i <= last; i++)
+					pc->interp_mode[i] = mode;
+			}
 				break;
 			case TGSI_FILE_CONSTANT:
 				if (pc->param_nr < (last + 1))