Mesa (radeon-rewrite): r300: Redirect constant TEX coordinates

[Nicolai Hähnle]

Module: Mesa
Branch: radeon-rewrite
Commit: 9a26164f3525c31607e3e676e0d41e496dada4c2
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=9a26164f3525c31607e3e676e0d41e496dada4c2

Author: Nicolai Haehnle <nhaehnle at gmail.com>
Date:   Sat Feb 14 17:06:06 2009 +0100

r300: Redirect constant TEX coordinates

R3xx/R5xx fragment program texture constants must come from a hardware
register instead of the constant file, so we redirect if necessary during
the native rewrite phase.

The symptoms of this bug started appearing when the Mesa fixed function
texenvprogram code started using STATE_CURRENT_ATTRIB constants for
texture coordinates when the corresponding attributes were constant across
all vertices.

Signed-off-by: Nicolai Haehnle <nhaehnle at gmail.com>

---

 src/mesa/drivers/dri/r300/r300_fragprog.c |   13 +++++++++++++
 src/mesa/drivers/dri/r300/r500_fragprog.c |   19 +++++++++++++++++++
 2 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/r300/r300_fragprog.c b/src/mesa/drivers/dri/r300/r300_fragprog.c
index 4ef7f2b..8d030c6 100644
--- a/src/mesa/drivers/dri/r300/r300_fragprog.c
+++ b/src/mesa/drivers/dri/r300/r300_fragprog.c
@@ -163,6 +163,19 @@ static GLboolean transform_TEX(
 		}
 	}
 
+	if (inst.SrcReg[0].File != PROGRAM_TEMPORARY && inst.SrcReg[0].File != PROGRAM_INPUT) {
+		int tmpreg = radeonFindFreeTemporary(t);
+		tgt = radeonAppendInstructions(t->Program, 1);
+		tgt->Opcode = OPCODE_MOV;
+		tgt->DstReg.File = PROGRAM_TEMPORARY;
+		tgt->DstReg.Index = tmpreg;
+		tgt->SrcReg[0] = inst.SrcReg[0];
+
+		reset_srcreg(&inst.SrcReg[0]);
+		inst.SrcReg[0].File = PROGRAM_TEMPORARY;
+		inst.SrcReg[0].Index = tmpreg;
+	}
+	
 	tgt = radeonAppendInstructions(t->Program, 1);
 	_mesa_copy_instructions(tgt, &inst, 1);
 
diff --git a/src/mesa/drivers/dri/r300/r500_fragprog.c b/src/mesa/drivers/dri/r300/r500_fragprog.c
index 75dae86..926ddd5 100644
--- a/src/mesa/drivers/dri/r300/r500_fragprog.c
+++ b/src/mesa/drivers/dri/r300/r500_fragprog.c
@@ -31,6 +31,12 @@
 #include "radeon_program_alu.h"
 
 
+static void reset_srcreg(struct prog_src_register* reg)
+{
+	_mesa_bzero(reg, sizeof(*reg));
+	reg->Swizzle = SWIZZLE_NOOP;
+}
+
 static struct prog_src_register shadow_ambient(struct gl_program *program, int tmu)
 {
 	gl_state_index fail_value_tokens[STATE_LENGTH] = {
@@ -99,6 +105,19 @@ static GLboolean transform_TEX(
 		destredirect = GL_TRUE;
 	}
 
+	if (inst.SrcReg[0].File != PROGRAM_TEMPORARY && inst.SrcReg[0].File != PROGRAM_INPUT) {
+		int tmpreg = radeonFindFreeTemporary(t);
+		tgt = radeonAppendInstructions(t->Program, 1);
+		tgt->Opcode = OPCODE_MOV;
+		tgt->DstReg.File = PROGRAM_TEMPORARY;
+		tgt->DstReg.Index = tmpreg;
+		tgt->SrcReg[0] = inst.SrcReg[0];
+
+		reset_srcreg(&inst.SrcReg[0]);
+		inst.SrcReg[0].File = PROGRAM_TEMPORARY;
+		inst.SrcReg[0].Index = tmpreg;
+	}
+
 	tgt = radeonAppendInstructions(t->Program, 1);
 	_mesa_copy_instructions(tgt, &inst, 1);