Mesa (master): i965/gen4: Fix message parameter loading for 1D TXD sampling .

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: 3e1fd13f605f16e8b48f3a9b71910a3c66eb84b5
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=3e1fd13f605f16e8b48f3a9b71910a3c66eb84b5

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Mon Jul 25 14:27:07 2011 -0700

i965/gen4: Fix message parameter loading for 1D TXD sampling.

We were neglecting to load dvdx and dvdy.  v is not optional.

Fixes glslparsertests tex-grad-0[12345].frag on Broadwater/Crestline.
(We still need an execution test using sampler1D.)

NOTE: This is a candidate for the 7.11 branch.

Reviewed-by: Eric Anholt <eric at anholt.net>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/drivers/dri/i965/brw_fs_visitor.cpp |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index 9632aae..b82dfd5 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -622,6 +622,8 @@ fs_visitor::emit_texture_gen4(ir_texture *ir, fs_reg dst, fs_reg coordinate,
        * dPdx = dudx, dvdx, drdx
        * dPdy = dudy, dvdy, drdy
        *
+       * 1-arg: Does not exist.
+       *
        * 2-arg: dudx   dvdx   dudy   dvdy
        *        dPdx.x dPdx.y dPdy.x dPdy.y
        *        m4     m5     m6     m7
@@ -633,14 +635,14 @@ fs_visitor::emit_texture_gen4(ir_texture *ir, fs_reg dst, fs_reg coordinate,
       for (int i = 0; i < ir->lod_info.grad.dPdx->type->vector_elements; i++) {
 	 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdx);
 	 dPdx.reg_offset++;
-	 mlen++;
       }
+      mlen += MAX2(ir->lod_info.grad.dPdx->type->vector_elements, 2);
 
       for (int i = 0; i < ir->lod_info.grad.dPdy->type->vector_elements; i++) {
 	 emit(BRW_OPCODE_MOV, fs_reg(MRF, base_mrf + mlen), dPdy);
 	 dPdy.reg_offset++;
-	 mlen++;
       }
+      mlen += MAX2(ir->lod_info.grad.dPdy->type->vector_elements, 2);
    } else {
       /* Oh joy.  gen4 doesn't have SIMD8 non-shadow-compare bias/lod
        * instructions.  We'll need to do SIMD16 here.