i965: Stop muging cube array lengths by 6

From the Sky Lake PRM:

   "For SURFTYPE_CUBE: For Sampling Engine Surfaces and Typed Data Port
   Surfaces, the range of this field is [0,340], indicating the number of
   cube array elements (equal to the number of underlying 2D array elements
   divided by 6). For other surfaces, this field must be zero."

In other words, the depth field for cube maps is in number of cubes not
number of 2-D slices so we need to divide by 6.  ISL will do this correctly
for us assuming that we provide it with the correct array bounds which it
expects to be in 2-D slices.  It appears as if we've been doing this wrong
ever since we first added cube map arrays for Sandy Bridge and the change
to ISL made things slightly worse.  While we're at it, we now need to remoe
the shader hacks we've always done since they were only needed because we
were setting the depth field six times too large.

v2: Fix the vec4 backend as well (not sure how I missed this).

Signed-off-by: Jason Ekstrand <[email protected]>
Reviewed-by: Iago Toral Quiroga <[email protected]>
Reviewed-by: Chris Forbes <[email protected]>

5 files changed, 11 insertions, 38 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
index 3da6d7523e9..44c4bdc63ab 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
@@ -4535,26 +4535,15 @@ fs_visitor::nir_emit_texture(const fs_builder &bld, nir_tex_instr *instr)
    for (unsigned i = 0; i < dest_size; i++)
       nir_dest[i] = offset(dst, bld, i);
 
-   bool is_cube_array = instr->sampler_dim == GLSL_SAMPLER_DIM_CUBE &&
-                        instr->is_array;
-
    if (instr->op == nir_texop_query_levels) {
       /* # levels is in .w */
       nir_dest[0] = offset(dst, bld, 3);
-   } else if (instr->op == nir_texop_txs && dest_size >= 3 &&
-              (devinfo->gen < 7 || is_cube_array)) {
+   } else if (instr->op == nir_texop_txs &&
+              dest_size >= 3 && devinfo->gen < 7) {
+      /* Gen4-6 return 0 instead of 1 for single layer surfaces. */
       fs_reg depth = offset(dst, bld, 2);
-      fs_reg fixed_depth = vgrf(glsl_type::int_type);
-
-      if (is_cube_array) {
-         /* fixup #layers for cube map arrays */
-         bld.emit(SHADER_OPCODE_INT_QUOTIENT, fixed_depth, depth, brw_imm_d(6));
-      } else if (devinfo->gen < 7) {
-         /* Gen4-6 return 0 instead of 1 for single layer surfaces. */
-         bld.emit_minmax(fixed_depth, depth, brw_imm_d(1), BRW_CONDITIONAL_GE);
-      }
-
-      nir_dest[2] = fixed_depth;
+      nir_dest[2] = vgrf(glsl_type::int_type);
+      bld.emit_minmax(nir_dest[2], depth, brw_imm_d(1), BRW_CONDITIONAL_GE);
    }
 
    bld.LOAD_PAYLOAD(get_nir_dest(instr->dest), nir_dest, dest_size, 0);
diff --git a/src/mesa/drivers/dri/i965/brw_vec4.h b/src/mesa/drivers/dri/i965/brw_vec4.h
index 3043147b187..d544e711da9 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.h
+++ b/src/mesa/drivers/dri/i965/brw_vec4.h
@@ -259,7 +259,6 @@ public:
                      uint32_t constant_offset,
                      src_reg offset_value,
                      src_reg mcs,
-                     bool is_cube_array,
                      uint32_t surface, src_reg surface_reg,
                      uint32_t sampler, src_reg sampler_reg);
 
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
index 3b2050801ad..4f3cc3d3e3e 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
@@ -1955,16 +1955,10 @@ vec4_visitor::nir_emit_texture(nir_tex_instr *instr)
 
    ir_texture_opcode op = ir_texture_opcode_for_nir_texop(instr->op);
 
-   bool is_cube_array =
-      instr->op == nir_texop_txs &&
-      instr->sampler_dim == GLSL_SAMPLER_DIM_CUBE &&
-      instr->is_array;
-
    emit_texture(op, dest, dest_type, coordinate, instr->coord_components,
                 shadow_comparitor,
                 lod, lod2, sample_index,
-                constant_offset, offset_value,
-                mcs, is_cube_array,
+                constant_offset, offset_value, mcs,
                 texture, texture_reg, sampler, sampler_reg);
 }
 
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index 652b4530c56..b87d0a6939e 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -907,7 +907,6 @@ vec4_visitor::emit_texture(ir_texture_opcode op,
                            uint32_t constant_offset,
                            src_reg offset_value,
                            src_reg mcs,
-                           bool is_cube_array,
                            uint32_t surface,
                            src_reg surface_reg,
                            uint32_t sampler,
@@ -1095,16 +1094,10 @@ vec4_visitor::emit_texture(ir_texture_opcode op,
    /* fixup num layers (z) for cube arrays: hardware returns faces * layers;
     * spec requires layers.
     */
-   if (op == ir_txs) {
-      if (is_cube_array) {
-         emit_math(SHADER_OPCODE_INT_QUOTIENT,
-                   writemask(inst->dst, WRITEMASK_Z),
-                   src_reg(inst->dst), brw_imm_d(6));
-      } else if (devinfo->gen < 7) {
-         /* Gen4-6 return 0 instead of 1 for single layer surfaces. */
-         emit_minmax(BRW_CONDITIONAL_GE, writemask(inst->dst, WRITEMASK_Z),
-                     src_reg(inst->dst), brw_imm_d(1));
-      }
+   if (op == ir_txs && devinfo->gen < 7) {
+      /* Gen4-6 return 0 instead of 1 for single layer surfaces. */
+      emit_minmax(BRW_CONDITIONAL_GE, writemask(inst->dst, WRITEMASK_Z),
+                  src_reg(inst->dst), brw_imm_d(1));
    }
 
    if (devinfo->gen == 6 && op == ir_tg4) {
diff --git a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
index 87f8601b0ac..9bee7dddbf8 100644
--- a/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_wm_surface_state.c
@@ -396,11 +396,9 @@ brw_update_texture_surface(struct gl_context *ctx,
       /* If this is a view with restricted NumLayers, then our effective depth
        * is not just the miptree depth.
        */
-      const unsigned mt_num_layers =
-         mt->logical_depth0 * (_mesa_is_cube_map_texture(mt->target) ? 6 : 1);
       const unsigned view_num_layers =
          (obj->Immutable && obj->Target != GL_TEXTURE_3D) ? obj->NumLayers :
-                                                            mt_num_layers;
+                                                            mt->logical_depth0;
 
       /* Handling GL_ALPHA as a surface format override breaks 1.30+ style
        * texturing functions that return a float, as our code generation always