Mesa (master): i965: When emitting a src/dst read of an output, keep the swizzle and neg

[Ian Romanick]

Module: Mesa
Branch: master
Commit: 1d3f09f15998c60326bf6c53a8d32c82496264ae
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=1d3f09f15998c60326bf6c53a8d32c82496264ae

Author: Ian Romanick <ian.d.romanick at intel.com>
Date:   Wed Jul 20 18:07:50 2011 -0700

i965: When emitting a src/dst read of an output, keep the swizzle and neg

Fixes i965 piglit vs-varying-array-mat[234]-row-rd.

Reviewed-by: Eric Anholt <eric at anholt.net>

---

 src/mesa/drivers/dri/i965/brw_vs_emit.c |   19 ++++++++++++++++---
 1 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_vs_emit.c b/src/mesa/drivers/dri/i965/brw_vs_emit.c
index 5ef8b07..d8cb0f7 100644
--- a/src/mesa/drivers/dri/i965/brw_vs_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_vs_emit.c
@@ -1980,9 +1980,22 @@ void brw_vs_emit(struct brw_vs_compile *c )
 	      const struct prog_src_register *src = &inst->SrcReg[i];
 	      index = src->Index;
 	      file = src->File;	
-	      if (file == PROGRAM_OUTPUT && c->output_regs[index].used_in_src)
-		  args[i] = c->output_regs[index].reg;
-	      else
+	      if (file == PROGRAM_OUTPUT && c->output_regs[index].used_in_src) {
+		 /* Can't just make get_arg "do the right thing" here because
+		  * other callers of get_arg and get_src_reg don't expect any
+		  * special behavior for the c->output_regs[index].used_in_src
+		  * case.
+		  */
+		 args[i] = c->output_regs[index].reg;
+		 args[i].dw1.bits.swizzle =
+		    BRW_SWIZZLE4(GET_SWZ(src->Swizzle, 0),
+				 GET_SWZ(src->Swizzle, 1),
+				 GET_SWZ(src->Swizzle, 2),
+				 GET_SWZ(src->Swizzle, 3));
+
+		 /* Note this is ok for non-swizzle ARB_vp instructions */
+		 args[i].negate = src->Negate ? 1 : 0;
+	      } else
                   args[i] = get_arg(c, inst, i);
 	  }