[Mesa-dev] [PATCH] i965/gen4: Fix message parameter loading for 1D TXD sampling.

[Kenneth Graunke]

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

Fixes piglit tests tex-grad-0[12345].frag on Broadwater/Crestline.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
---
 src/mesa/drivers/dri/i965/brw_fs_visitor.cpp |    4 ++--
 1 files changed, 2 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..c6ed02c 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -633,14 +633,14 @@ 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.
-- 
1.7.6