glsl: Add ir_samples_identical opcode

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>

src/glsl/ir.cpp

@@ -1421,7 +1421,7 @@ ir_dereference::is_lvalue() const
 }
 
 
-static const char * const tex_opcode_strs[] = { "tex", "txb", "txl", "txd", "txf", "txf_ms", "txs", "lod", "tg4", "query_levels", "texture_samples" };
+static const char * const tex_opcode_strs[] = { "tex", "txb", "txl", "txd", "txf", "txf_ms", "txs", "lod", "tg4", "query_levels", "texture_samples", "samples_identical" };
 
 const char *ir_texture::opcode_string()
 {
@@ -1455,6 +1455,10 @@ ir_texture::set_sampler(ir_dereference *sampler, const glsl_type *type)
    } else if (this->op == ir_lod) {
       assert(type->vector_elements == 2);
       assert(type->base_type == GLSL_TYPE_FLOAT);
+   } else if (this->op == ir_samples_identical) {
+      assert(type == glsl_type::bool_type);
+      assert(sampler->type->base_type == GLSL_TYPE_SAMPLER);
+      assert(sampler->type->sampler_dimensionality == GLSL_SAMPLER_DIM_MS);
    } else {
       assert(sampler->type->sampler_type == (int) type->base_type);
       if (sampler->type->sampler_shadow)

src/glsl/ir.h

@@ -1965,6 +1965,7 @@ enum ir_texture_opcode {
    ir_tg4,		/**< Texture gather */
    ir_query_levels,     /**< Texture levels query */
    ir_texture_samples,  /**< Texture samples query */
+   ir_samples_identical, /**< Query whether all samples are definitely identical. */
 };
 
 
@@ -1991,6 +1992,7 @@ enum ir_texture_opcode {
  * (lod <type> <sampler> <coordinate>)
  * (tg4 <type> <sampler> <coordinate> <offset> <component>)
  * (query_levels <type> <sampler>)
+ * (samples_identical <sampler> <coordinate>)
  */
 class ir_texture : public ir_rvalue {
 public:

src/glsl/ir_clone.cpp

@@ -223,6 +223,7 @@ ir_texture::clone(void *mem_ctx, struct hash_table *ht) const
    case ir_lod:
    case ir_query_levels:
    case ir_texture_samples:
+   case ir_samples_identical:
       break;
    case ir_txb:
       new_tex->lod_info.bias = this->lod_info.bias->clone(mem_ctx, ht);

src/glsl/ir_equals.cpp

@@ -157,6 +157,7 @@ ir_texture::equals(const ir_instruction *ir, enum ir_node_type ignore) const
    case ir_lod:
    case ir_query_levels:
    case ir_texture_samples:
+   case ir_samples_identical:
       break;
    case ir_txb:
       if (!lod_info.bias->equals(other->lod_info.bias, ignore))

src/glsl/ir_hv_accept.cpp

@@ -195,6 +195,7 @@ ir_texture::accept(ir_hierarchical_visitor *v)
    case ir_lod:
    case ir_query_levels:
    case ir_texture_samples:
+   case ir_samples_identical:
       break;
    case ir_txb:
       s = this->lod_info.bias->accept(v);

src/glsl/ir_print_visitor.cpp

@@ -268,6 +268,14 @@ void ir_print_visitor::visit(ir_texture *ir)
 {
    fprintf(f, "(%s ", ir->opcode_string());
 
+   if (ir->op == ir_samples_identical) {
+      ir->sampler->accept(this);
+      fprintf(f, " ");
+      ir->coordinate->accept(this);
+      fprintf(f, ")");
+      return;
+   }
+
    print_type(f, ir->type);
    fprintf(f, " ");
 
@@ -334,6 +342,8 @@ void ir_print_visitor::visit(ir_texture *ir)
    case ir_tg4:
       ir->lod_info.component->accept(this);
       break;
+   case ir_samples_identical:
+      unreachable(!"ir_samples_identical was already handled");
    };
    fprintf(f, ")");
 }

src/glsl/ir_rvalue_visitor.cpp

@@ -59,6 +59,7 @@ ir_rvalue_base_visitor::rvalue_visit(ir_texture *ir)
    case ir_lod:
    case ir_query_levels:
    case ir_texture_samples:
+   case ir_samples_identical:
       break;
    case ir_txb:
       handle_rvalue(&ir->lod_info.bias);

src/glsl/opt_tree_grafting.cpp

@@ -275,6 +275,7 @@ ir_tree_grafting_visitor::visit_enter(ir_texture *ir)
    case ir_lod:
    case ir_query_levels:
    case ir_texture_samples:
+   case ir_samples_identical:
       break;
    case ir_txb:
       if (do_graft(&ir->lod_info.bias))

src/mesa/program/ir_to_mesa.cpp

@@ -1919,6 +1919,8 @@ ir_to_mesa_visitor::visit(ir_texture *ir)
    case ir_query_levels:
       assert(!"Unexpected ir_query_levels opcode");
       break;
+   case ir_samples_identical:
+      unreachable("Unexpected ir_samples_identical opcode");
    case ir_texture_samples:
       unreachable("Unexpected ir_texture_samples opcode");
    }

src/mesa/state_tracker/st_glsl_to_tgsi.cpp

@@ -3236,6 +3236,8 @@ glsl_to_tgsi_visitor::visit(ir_texture *ir)
    case ir_texture_samples:
       opcode = TGSI_OPCODE_TXQS;
       break;
+   case ir_samples_identical:
+      unreachable("Unexpected ir_samples_identical opcode");
    }
 
    if (ir->projector) {