Mesa (gallium-0.2): nv20: rewrite vertex layout

[Pekka Paalanen]

Module: Mesa
Branch: gallium-0.2
Commit: f25421a59b002a8b679df86c0a072cf853e94f10
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f25421a59b002a8b679df86c0a072cf853e94f10

Author: Pekka Paalanen <pq at iki.fi>
Date:   Mon Jan 26 21:15:48 2009 +0200

nv20: rewrite vertex layout

NV20 seems to be very different to NV10. In vertex array, pos is first,
not last. There are maximum 16 attributes and only few are currently
known.

This makes trivial/tri work on NV20.

Signed-off-by: Pekka Paalanen <pq at iki.fi>

---

 src/gallium/drivers/nv20/nv20_state_emit.c |   85 +++++++++++++++++++---------
 1 files changed, 59 insertions(+), 26 deletions(-)

diff --git a/src/gallium/drivers/nv20/nv20_state_emit.c b/src/gallium/drivers/nv20/nv20_state_emit.c
index 5265bf3..cbdc674 100644
--- a/src/gallium/drivers/nv20/nv20_state_emit.c
+++ b/src/gallium/drivers/nv20/nv20_state_emit.c
@@ -159,8 +159,8 @@ static void nv20_state_emit_framebuffer(struct nv20_context* nv20)
 
 	BEGIN_RING(kelvin, NV20TCL_RT_HORIZ, 3);
 	OUT_RING  ((w << 16) | 0);
-	OUT_RING  ((h << 16) | 0);
-	OUT_RING  (rt_format);
+	OUT_RING  ((h << 16) | 0); /*NV20TCL_RT_VERT */
+	OUT_RING  (rt_format); /* NV20TCL_RT_FORMAT */
 	BEGIN_RING(kelvin, NV20TCL_VIEWPORT_CLIP_HORIZ(0), 2);
 	OUT_RING  (((w - 1) << 16) | 0);
 	OUT_RING  (((h - 1) << 16) | 0);
@@ -170,24 +170,29 @@ static void nv20_vertex_layout(struct nv20_context *nv20)
 {
 	struct nv20_fragment_program *fp = nv20->fragprog.current;
 	struct draw_context *dc = nv20->draw;
-	uint32_t src;
+	int src;
 	int i;
 	struct vertex_info *vinfo = &nv20->vertex_info;
 	const enum interp_mode colorInterp = INTERP_LINEAR;
 	boolean colors[2] = { FALSE };
-	boolean generics[4] = { FALSE };
+	boolean generics[12] = { FALSE };
 	boolean fog = FALSE;
 
 	memset(vinfo, 0, sizeof(*vinfo));
 
 	/*
-	 * NV10 hardware vertex attribute order:
-	 * fog, weight, normal, tex1, tex0, 2nd color, color, position
+	 * Assumed NV20 hardware vertex attribute order:
+	 * 0 position, 1 ?, 2 ?, 3 col0,
+	 * 4 col1?, 5 ?, 6 ?, 7 ?,
+	 * 8 ?, 9 tex0, 10 tex1, 11 tex2,
+	 * 12 tex3, 13 ?, 14 ?, 15 ?
+	 * unaccounted: wgh, nor, fog
+	 * There are total 16 attrs.
 	 * vinfo->hwfmt[0] has a used-bit corresponding to each of these.
 	 * relation to TGSI_SEMANTIC_*:
 	 * - POSITION: position (always used)
-	 * - COLOR: 2nd color, color
-	 * - GENERIC: weight, normal, tex1, tex0
+	 * - COLOR: col1, col0
+	 * - GENERIC: tex3, tex2, tex1, tex0, normal, weight
 	 * - FOG: fog
 	 */
 
@@ -202,7 +207,7 @@ static void nv20_vertex_layout(struct nv20_context *nv20)
 			colors[isi] = TRUE;
 			break;
 		case TGSI_SEMANTIC_GENERIC:
-			assert(isi < 4);
+			assert(isi < 12);
 			generics[isi] = TRUE;
 			break;
 		case TGSI_SEMANTIC_FOG:
@@ -213,37 +218,65 @@ static void nv20_vertex_layout(struct nv20_context *nv20)
 		}
 	}
 
-	if (fog) {
-		int src = draw_find_vs_output(dc, TGSI_SEMANTIC_FOG, 0);
-		draw_emit_vertex_attr(vinfo, EMIT_1F, INTERP_PERSPECTIVE, src);
-		vinfo->hwfmt[0] |= (1 << 7);
+	/* always do position */ {
+		src = draw_find_vs_output(dc, TGSI_SEMANTIC_POSITION, 0);
+		draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_LINEAR, src);
+		vinfo->hwfmt[0] |= (1 << 0);
 	}
 
-	for (i = 3; i >= 0; i--) {
-		int src;
+	/* two unnamed generics */
+	for (i = 4; i < 6; i++) {
 		if (!generics[i])
 			continue;
 		src = draw_find_vs_output(dc, TGSI_SEMANTIC_GENERIC, i);
 		draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
-		vinfo->hwfmt[0] |= (1 << (i + 3));
+		vinfo->hwfmt[0] |= (1 << (i - 3));
 	}
 
-	if (colors[1]) {
-		int src = draw_find_vs_output(dc, TGSI_SEMANTIC_COLOR, 1);
+	if (colors[0]) {
+		src = draw_find_vs_output(dc, TGSI_SEMANTIC_COLOR, 0);
 		draw_emit_vertex_attr(vinfo, EMIT_4F, colorInterp, src);
-		vinfo->hwfmt[0] |= (1 << 2);
+		vinfo->hwfmt[0] |= (1 << 3);
 	}
 
-	if (colors[0]) {
-		int src = draw_find_vs_output(dc, TGSI_SEMANTIC_COLOR, 0);
+	if (colors[1]) {
+		src = draw_find_vs_output(dc, TGSI_SEMANTIC_COLOR, 1);
 		draw_emit_vertex_attr(vinfo, EMIT_4F, colorInterp, src);
-		vinfo->hwfmt[0] |= (1 << 1);
+		vinfo->hwfmt[0] |= (1 << 4);
 	}
 
-	/* always do position */
-	src = draw_find_vs_output(dc, TGSI_SEMANTIC_POSITION, 0);
-	draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_LINEAR, src);
-	vinfo->hwfmt[0] |= (1 << 0);
+	/* four unnamed generics */
+	for (i = 6; i < 10; i++) {
+		if (!generics[i])
+			continue;
+		src = draw_find_vs_output(dc, TGSI_SEMANTIC_GENERIC, i);
+		draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
+		vinfo->hwfmt[0] |= (1 << (i - 1));
+	}
+
+	/* tex0, tex1, tex2, tex3 */
+	for (i = 0; i < 4; i++) {
+		if (!generics[i])
+			continue;
+		src = draw_find_vs_output(dc, TGSI_SEMANTIC_GENERIC, i);
+		draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
+		vinfo->hwfmt[0] |= (1 << (i + 9));
+	}
+
+	/* two unnamed generics */
+	for (i = 10; i < 12; i++) {
+		if (!generics[i])
+			continue;
+		src = draw_find_vs_output(dc, TGSI_SEMANTIC_GENERIC, i);
+		draw_emit_vertex_attr(vinfo, EMIT_4F, INTERP_PERSPECTIVE, src);
+		vinfo->hwfmt[0] |= (1 << (i + 3));
+	}
+
+	if (fog) {
+		src = draw_find_vs_output(dc, TGSI_SEMANTIC_FOG, 0);
+		draw_emit_vertex_attr(vinfo, EMIT_1F, INTERP_PERSPECTIVE, src);
+		vinfo->hwfmt[0] |= (1 << 15);
+	}
 
 	draw_compute_vertex_size(vinfo);
 }