Mesa (radeon-rewrite): r300: fix vertex program bug

[Maciej Cencora]

Module: Mesa
Branch: radeon-rewrite
Commit: de19eb0b0dba08b2ad3829b7ced94931139af843
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=de19eb0b0dba08b2ad3829b7ced94931139af843

Author: Maciej Cencora <m.cencora at gmail.com>
Date:   Fri Jun  5 18:32:05 2009 +0200

r300: fix vertex program bug

If the vertex program didn't write position attribute, the position invariant function would add necessary instructions, but the vertex position would be overwritten by artificial outputs insts added to satisfy fragment program requirements.

Fixes "whole screen is gray" problem for HW TCL path in sauerbraten when shaders are enabled, and whole slew of wine d3d9 tests.

---

 src/mesa/drivers/dri/r300/r300_vertprog.c |   16 ++++++++++------
 1 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/src/mesa/drivers/dri/r300/r300_vertprog.c b/src/mesa/drivers/dri/r300/r300_vertprog.c
index 66750b1..c41a8fd 100644
--- a/src/mesa/drivers/dri/r300/r300_vertprog.c
+++ b/src/mesa/drivers/dri/r300/r300_vertprog.c
@@ -1456,7 +1456,12 @@ void r300SelectVertexShader(r300ContextPtr r300)
 		wpos_idx = i;
 	}
 
-	add_outputs(&wanted_key, VERT_RESULT_HPOS);
+	if (vpc->mesa_program.IsPositionInvariant) {
+		wanted_key.InputsRead |= (1 << VERT_ATTRIB_POS);
+		wanted_key.OutputsWritten |= (1 << VERT_RESULT_HPOS);
+	} else {
+		add_outputs(&wanted_key, VERT_RESULT_HPOS);
+	}
 
 	if (InputsRead & FRAG_BIT_COL0) {
 		add_outputs(&wanted_key, VERT_RESULT_COL0);
@@ -1466,17 +1471,16 @@ void r300SelectVertexShader(r300ContextPtr r300)
 		add_outputs(&wanted_key, VERT_RESULT_COL1);
 	}
 
+	if (InputsRead & FRAG_BIT_FOGC) {
+		add_outputs(&wanted_key, VERT_RESULT_FOGC);
+	}
+
 	for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
 		if (InputsRead & (FRAG_BIT_TEX0 << i)) {
 			add_outputs(&wanted_key, VERT_RESULT_TEX0 + i);
 		}
 	}
 
-	if (vpc->mesa_program.IsPositionInvariant) {
-		/* we wan't position don't we ? */
-		wanted_key.InputsRead |= (1 << VERT_ATTRIB_POS);
-	}
-
 	for (vp = vpc->progs; vp; vp = vp->next)
 		if (_mesa_memcmp(&vp->key, &wanted_key, sizeof(wanted_key))
 		    == 0) {