anv: Add some NIR builder helpers

These should all eventually be up-streamed.  However, since they currently
have no upstream users, they would just bitrot there.  We'll keep them
local for the time being.

src/vulkan/anv_nir_builder.h

@@ -0,0 +1,102 @@
+/*
+ * 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 "anv_nir.h"
+#include "glsl/nir/nir_builder.h"
+#include "util/ralloc.h"
+
+/* This file includes NIR helpers used by meta shaders in the Vulkan
+ * driver.  Eventually, these will all be merged into nir_builder.
+ * However, for now, keeping them in their own file helps to prevent merge
+ * conflicts.
+ */
+
+static inline void
+nir_builder_init_simple_shader(nir_builder *b, gl_shader_stage stage)
+{
+   b->shader = nir_shader_create(NULL, stage, NULL);
+
+   nir_function *func = nir_function_create(b->shader,
+                                            ralloc_strdup(b->shader, "main"));
+   nir_function_overload *overload = nir_function_overload_create(func);
+   overload->num_params = 0;
+
+   b->impl = nir_function_impl_create(overload);
+   b->cursor = nir_after_cf_list(&b->impl->body);
+}
+
+static inline void
+nir_copy_var(nir_builder *build, nir_variable *dest, nir_variable *src)
+{
+   nir_intrinsic_instr *copy =
+      nir_intrinsic_instr_create(build->shader, nir_intrinsic_copy_var);
+   copy->variables[0] = nir_deref_var_create(copy, dest);
+   copy->variables[1] = nir_deref_var_create(copy, src);
+   nir_builder_instr_insert(build, &copy->instr);
+}
+
+static inline nir_variable *
+nir_variable_create(nir_shader *shader, const char *name,
+                    const struct glsl_type *type, nir_variable_mode mode)
+{
+   nir_variable *var = rzalloc(shader, nir_variable);
+   var->name = ralloc_strdup(var, name);
+   var->type = type;
+   var->data.mode = mode;
+
+   if ((mode == nir_var_shader_in && shader->stage != MESA_SHADER_VERTEX) ||
+       (mode == nir_var_shader_out && shader->stage != MESA_SHADER_FRAGMENT))
+      var->data.interpolation = INTERP_QUALIFIER_SMOOTH;
+
+   switch (var->data.mode) {
+   case nir_var_local:
+      assert(!"nir_variable_create cannot be used for local variables");
+      break;
+
+   case nir_var_global:
+      exec_list_push_tail(&shader->globals, &var->node);
+      break;
+
+   case nir_var_shader_in:
+      exec_list_push_tail(&shader->inputs, &var->node);
+      break;
+
+   case nir_var_shader_out:
+      exec_list_push_tail(&shader->outputs, &var->node);
+      break;
+
+   case nir_var_uniform:
+   case nir_var_shader_storage:
+      exec_list_push_tail(&shader->uniforms, &var->node);
+      break;
+
+   case nir_var_system_value:
+      exec_list_push_tail(&shader->system_values, &var->node);
+      break;
+
+   default:
+      unreachable("not reached");
+   }
+
+   return var;
+}