i965/nir/vec4: Add implementation placeholders for a new NIR->vec4 pass

This patch will add a brw_vec4_nir.cpp file filled with entry point methods to
the main functionality, following a structure similar to brw_fs_nir.cpp.

Subsequent patches in this series will be adding the implementations for these
methods, incrementally.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>

src/mesa/drivers/dri/i965/Makefile.sources

@@ -125,6 +125,7 @@ i965_FILES = \
 	brw_vec4.h \
 	brw_vec4_live_variables.cpp \
 	brw_vec4_live_variables.h \
+	brw_vec4_nir.cpp \
 	brw_vec4_reg_allocate.cpp \
 	brw_vec4_visitor.cpp \
 	brw_vec4_vp.cpp \

src/mesa/drivers/dri/i965/brw_vec4.h

@@ -45,6 +45,7 @@ extern "C" {
 #endif
 
 #include "glsl/ir.h"
+#include "glsl/nir/nir.h"
 
 
 #ifdef __cplusplus
@@ -389,6 +390,24 @@ public:
 
    void visit_atomic_counter_intrinsic(ir_call *ir);
 
+   virtual void emit_nir_code();
+   virtual void nir_setup_inputs(nir_shader *shader);
+   virtual void nir_setup_uniforms(nir_shader *shader);
+   virtual void nir_setup_uniform(nir_variable *var);
+   virtual void nir_setup_builtin_uniform(nir_variable *var);
+   virtual void nir_setup_system_values(nir_shader *shader);
+   virtual void nir_emit_impl(nir_function_impl *impl);
+   virtual void nir_emit_cf_list(exec_list *list);
+   virtual void nir_emit_if(nir_if *if_stmt);
+   virtual void nir_emit_loop(nir_loop *loop);
+   virtual void nir_emit_block(nir_block *block);
+   virtual void nir_emit_instr(nir_instr *instr);
+   virtual void nir_emit_load_const(nir_load_const_instr *instr);
+   virtual void nir_emit_intrinsic(nir_intrinsic_instr *instr);
+   virtual void nir_emit_alu(nir_alu_instr *instr);
+   virtual void nir_emit_jump(nir_jump_instr *instr);
+   virtual void nir_emit_texture(nir_tex_instr *instr);
+
 protected:
    void emit_vertex();
    void lower_attributes_to_hw_regs(const int *attribute_map,

src/mesa/drivers/dri/i965/brw_vec4_nir.cpp

@@ -0,0 +1,253 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "brw_nir.h"
+#include "brw_vec4.h"
+#include "glsl/ir_uniform.h"
+
+namespace brw {
+
+void
+vec4_visitor::emit_nir_code()
+{
+   nir_shader *nir = prog->nir;
+
+   if (nir->num_inputs > 0)
+      nir_setup_inputs(nir);
+
+   if (nir->num_uniforms > 0)
+      nir_setup_uniforms(nir);
+
+   nir_setup_system_values(nir);
+
+   /* get the main function and emit it */
+   nir_foreach_overload(nir, overload) {
+      assert(strcmp(overload->function->name, "main") == 0);
+      assert(overload->impl);
+      nir_emit_impl(overload->impl);
+   }
+}
+
+static bool
+setup_system_values_block(nir_block *block, void *void_visitor)
+{
+   /* @TODO: Not yet implemented */
+   return true;
+}
+
+void
+vec4_visitor::nir_setup_system_values(nir_shader *shader)
+{
+   nir_foreach_overload(shader, overload) {
+      assert(strcmp(overload->function->name, "main") == 0);
+      assert(overload->impl);
+      nir_foreach_block(overload->impl, setup_system_values_block, this);
+   }
+}
+
+void
+vec4_visitor::nir_setup_inputs(nir_shader *shader)
+{
+   /* @TODO: Not yet implemented */
+}
+
+void
+vec4_visitor::nir_setup_uniforms(nir_shader *shader)
+{
+   /* @TODO: Not yet implemented */
+}
+
+void
+vec4_visitor::nir_setup_uniform(nir_variable *var)
+{
+   /* @TODO: Not yet implemented */
+}
+
+void
+vec4_visitor::nir_setup_builtin_uniform(nir_variable *var)
+{
+   /* @TODO: Not yet implemented */
+}
+
+void
+vec4_visitor::nir_emit_impl(nir_function_impl *impl)
+{
+   /* @TODO: Not yet implemented */
+}
+
+void
+vec4_visitor::nir_emit_cf_list(exec_list *list)
+{
+   exec_list_validate(list);
+   foreach_list_typed(nir_cf_node, node, node, list) {
+      switch (node->type) {
+      case nir_cf_node_if:
+         nir_emit_if(nir_cf_node_as_if(node));
+         break;
+
+      case nir_cf_node_loop:
+         nir_emit_loop(nir_cf_node_as_loop(node));
+         break;
+
+      case nir_cf_node_block:
+         nir_emit_block(nir_cf_node_as_block(node));
+         break;
+
+      default:
+         unreachable("Invalid CFG node block");
+      }
+   }
+}
+
+void
+vec4_visitor::nir_emit_if(nir_if *if_stmt)
+{
+   /* @TODO: Not yet implemented */
+}
+
+void
+vec4_visitor::nir_emit_loop(nir_loop *loop)
+{
+   /* @TODO: Not yet implemented */
+}
+
+void
+vec4_visitor::nir_emit_block(nir_block *block)
+{
+   nir_foreach_instr(block, instr) {
+      nir_emit_instr(instr);
+   }
+}
+
+void
+vec4_visitor::nir_emit_instr(nir_instr *instr)
+{
+   this->base_ir = instr;
+
+   switch (instr->type) {
+   case nir_instr_type_load_const:
+      nir_emit_load_const(nir_instr_as_load_const(instr));
+      break;
+
+   case nir_instr_type_intrinsic:
+      nir_emit_intrinsic(nir_instr_as_intrinsic(instr));
+      break;
+
+   case nir_instr_type_alu:
+      nir_emit_alu(nir_instr_as_alu(instr));
+      break;
+
+   case nir_instr_type_jump:
+      nir_emit_jump(nir_instr_as_jump(instr));
+      break;
+
+   case nir_instr_type_tex:
+      nir_emit_texture(nir_instr_as_tex(instr));
+      break;
+
+   default:
+      fprintf(stderr, "VS instruction not yet implemented by NIR->vec4\n");
+      break;
+   }
+}
+
+void
+vec4_visitor::nir_emit_load_const(nir_load_const_instr *instr)
+{
+   /* @TODO: Not yet implemented */
+}
+
+void
+vec4_visitor::nir_emit_intrinsic(nir_intrinsic_instr *instr)
+{
+   switch (instr->intrinsic) {
+
+   case nir_intrinsic_load_input_indirect:
+      /* fallthrough */
+   case nir_intrinsic_load_input:
+      /* @TODO: Not yet implemented */
+      break;
+
+   case nir_intrinsic_store_output_indirect:
+      /* fallthrough */
+   case nir_intrinsic_store_output:
+      /* @TODO: Not yet implemented */
+      break;
+
+   case nir_intrinsic_load_vertex_id:
+      unreachable("should be lowered by lower_vertex_id()");
+
+   case nir_intrinsic_load_vertex_id_zero_base:
+      /* @TODO: Not yet implemented */
+      break;
+
+   case nir_intrinsic_load_base_vertex:
+      /* @TODO: Not yet implemented */
+      break;
+
+   case nir_intrinsic_load_instance_id:
+      /* @TODO: Not yet implemented */
+      break;
+
+   case nir_intrinsic_load_uniform_indirect:
+      /* fallthrough */
+   case nir_intrinsic_load_uniform:
+      /* @TODO: Not yet implemented */
+      break;
+
+   case nir_intrinsic_atomic_counter_read:
+   case nir_intrinsic_atomic_counter_inc:
+   case nir_intrinsic_atomic_counter_dec:
+      /* @TODO: Not yet implemented */
+      break;
+
+   case nir_intrinsic_load_ubo_indirect:
+      /* fallthrough */
+   case nir_intrinsic_load_ubo:
+      /* @TODO: Not yet implemented */
+      break;
+
+   default:
+      unreachable("Unknown intrinsic");
+   }
+}
+
+void
+vec4_visitor::nir_emit_alu(nir_alu_instr *instr)
+{
+   /* @TODO: Not yet implemented */
+}
+
+void
+vec4_visitor::nir_emit_jump(nir_jump_instr *instr)
+{
+   /* @TODO: Not yet implemented */
+}
+
+void
+vec4_visitor::nir_emit_texture(nir_tex_instr *instr)
+{
+   /* @TODO: Not yet implemented */
+}
+
+}