+++ /dev/null
-/*
- * Copyright © 2016 Red Hat
- *
- * 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 "nir.h"
-#include "nir_builder.h"
-
-/* Lower complex (struct/array/mat) input and output vars to primitive types
- * (vec4) for linking. All indirect input/output access should already be
- * lowered (ie. nir_lower_io_to_temporaries).
- */
-
-struct lower_io_types_state {
- nir_shader *shader;
- struct exec_list new_ins;
- struct exec_list new_outs;
-};
-
-static nir_variable *
-get_new_var(struct lower_io_types_state *state, nir_variable *var,
- const struct glsl_type *deref_type, unsigned off)
-{
- struct exec_list *list;
-
- if (var->data.mode == nir_var_shader_in) {
- list = &state->new_ins;
- } else {
- assert(var->data.mode == nir_var_shader_out);
- list = &state->new_outs;
- }
-
- nir_foreach_variable(nvar, list) {
- if (nvar->data.location == (var->data.location + off))
- return nvar;
- }
-
- /* doesn't already exist, so we need to create a new one: */
- /* TODO figure out if we need to fixup interpolation mode for int vs float
- * components of a struct, etc..
- */
- nir_variable *nvar = nir_variable_create(state->shader, var->data.mode,
- deref_type, NULL);
-
- nvar->name = ralloc_asprintf(nvar, "%s@%u", var->name, off);
- nvar->data = var->data;
- nvar->data.location += off;
-
- /* nir_variable_create is too clever for its own good: */
- exec_node_remove(&nvar->node);
- exec_node_self_link(&nvar->node); /* no delinit() :-( */
-
- exec_list_push_tail(list, &nvar->node);
-
- /* remove existing var from input/output list: */
- exec_node_remove(&var->node);
- exec_node_self_link(&var->node);
-
- return nvar;
-}
-
-static unsigned
-get_deref_offset(struct lower_io_types_state *state, nir_deref *tail, bool vs_in)
-{
- unsigned offset = 0;
-
- while (tail->child != NULL) {
- const struct glsl_type *parent_type = tail->type;
- tail = tail->child;
-
- if (tail->deref_type == nir_deref_type_array) {
- nir_deref_array *deref_array = nir_deref_as_array(tail);
-
- /* indirect inputs/outputs should already be lowered! */
- assert(deref_array->deref_array_type == nir_deref_array_type_direct);
-
- unsigned size = glsl_count_attribute_slots(tail->type, vs_in);
-
- offset += size * deref_array->base_offset;
- } else if (tail->deref_type == nir_deref_type_struct) {
- nir_deref_struct *deref_struct = nir_deref_as_struct(tail);
-
- for (unsigned i = 0; i < deref_struct->index; i++) {
- const struct glsl_type *ft = glsl_get_struct_field(parent_type, i);
- offset += glsl_count_attribute_slots(ft, vs_in);
- }
- }
- }
-
- return offset;
-}
-
-static bool
-lower_io_types_block(struct lower_io_types_state *state, nir_block *block)
-{
- nir_foreach_instr(instr, block) {
- if (instr->type != nir_instr_type_intrinsic)
- continue;
-
- nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
-
- if ((intr->intrinsic != nir_intrinsic_load_var) &&
- (intr->intrinsic != nir_intrinsic_store_var))
- continue;
-
- nir_variable *var = intr->variables[0]->var;
-
- if ((var->data.mode != nir_var_shader_in) &&
- (var->data.mode != nir_var_shader_out))
- continue;
-
- bool vs_in = (state->shader->info.stage == MESA_SHADER_VERTEX) &&
- (var->data.mode == nir_var_shader_in);
- if (glsl_count_attribute_slots(var->type, vs_in) == 1)
- continue;
-
- unsigned off = get_deref_offset(state, &intr->variables[0]->deref, vs_in);
- const struct glsl_type *deref_type =
- nir_deref_tail(&intr->variables[0]->deref)->type;
- nir_variable *nvar = get_new_var(state, var, deref_type, off);
-
- /* and then re-write the load/store_var deref: */
- intr->variables[0] = nir_deref_var_create(intr, nvar);
- }
-
- return true;
-}
-
-static void
-lower_io_types_impl(nir_function_impl *impl, struct lower_io_types_state *state)
-{
- nir_foreach_block(block, impl) {
- lower_io_types_block(state, block);
- }
-
- nir_metadata_preserve(impl, nir_metadata_block_index |
- nir_metadata_dominance);
-}
-
-
-void
-nir_lower_io_types(nir_shader *shader)
-{
- struct lower_io_types_state state;
-
- nir_assert_lowered_derefs(shader, nir_lower_load_store_derefs);
-
- state.shader = shader;
- exec_list_make_empty(&state.new_ins);
- exec_list_make_empty(&state.new_outs);
-
- nir_foreach_function(function, shader) {
- if (function->impl)
- lower_io_types_impl(function->impl, &state);
- }
-
- /* move new in/out vars to shader's lists: */
- exec_list_append(&shader->inputs, &state.new_ins);
- exec_list_append(&shader->outputs, &state.new_outs);
-}
projects / mesa.git / commitdiff