intel/compiler: use 0 as sampler in emit_mcs_fetch

The sampler will be ignored since the underlying 'ld_mcs' operation
won't use it, so just fill the field with 0 instead of the texture to
make it clearer that's the case.

This will also avoid is_high_sampler() to kick in unnecessarily, in
case we are using the operation for a texture with index >= 16.

Reviewed-by: Kenneth Graunke <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>

2 files changed, 2 insertions, 2 deletions

diff --git a/src/intel/compiler/brw_fs_visitor.cpp b/src/intel/compiler/brw_fs_visitor.cpp
index 51a0ca2374a..741b226b150 100644
--- a/src/intel/compiler/brw_fs_visitor.cpp
+++ b/src/intel/compiler/brw_fs_visitor.cpp
@@ -42,7 +42,7 @@ fs_visitor::emit_mcs_fetch(const fs_reg &coordinate, unsigned components,
    fs_reg srcs[TEX_LOGICAL_NUM_SRCS];
    srcs[TEX_LOGICAL_SRC_COORDINATE] = coordinate;
    srcs[TEX_LOGICAL_SRC_SURFACE] = texture;
-   srcs[TEX_LOGICAL_SRC_SAMPLER] = texture;
+   srcs[TEX_LOGICAL_SRC_SAMPLER] = brw_imm_ud(0);
    srcs[TEX_LOGICAL_SRC_COORD_COMPONENTS] = brw_imm_d(components);
    srcs[TEX_LOGICAL_SRC_GRAD_COMPONENTS] = brw_imm_d(0);
 
diff --git a/src/intel/compiler/brw_vec4_visitor.cpp b/src/intel/compiler/brw_vec4_visitor.cpp
index 6459b8b79ea..41cebf0b838 100644
--- a/src/intel/compiler/brw_vec4_visitor.cpp
+++ b/src/intel/compiler/brw_vec4_visitor.cpp
@@ -863,7 +863,7 @@ vec4_visitor::emit_mcs_fetch(const glsl_type *coordinate_type,
                                     dst_reg(this, glsl_type::uvec4_type));
    inst->base_mrf = 2;
    inst->src[1] = surface;
-   inst->src[2] = surface;
+   inst->src[2] = brw_imm_ud(0); /* sampler */
 
    int param_base;