264 lines
8.1 KiB
C
264 lines
8.1 KiB
C
/*
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* Copyright © 2014 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Connor Abbott (cwabbott0@gmail.com)
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* Jason Ekstrand (jason@jlekstrand.net)
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*
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*/
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/*
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* This lowering pass converts references to input/output variables with
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* loads/stores to actual input/output intrinsics.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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struct lower_io_state {
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nir_builder builder;
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void *mem_ctx;
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int (*type_size)(const struct glsl_type *type);
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};
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void
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nir_assign_var_locations(struct exec_list *var_list, unsigned *size,
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int (*type_size)(const struct glsl_type *))
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{
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unsigned location = 0;
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foreach_list_typed(nir_variable, var, node, var_list) {
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/*
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* UBO's have their own address spaces, so don't count them towards the
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* number of global uniforms
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*/
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if ((var->data.mode == nir_var_uniform || var->data.mode == nir_var_shader_storage) &&
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var->interface_type != NULL)
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continue;
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var->data.driver_location = location;
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location += type_size(var->type);
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}
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*size = location;
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}
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static bool
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deref_has_indirect(nir_deref_var *deref)
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{
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for (nir_deref *tail = deref->deref.child; tail; tail = tail->child) {
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if (tail->deref_type == nir_deref_type_array) {
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nir_deref_array *arr = nir_deref_as_array(tail);
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if (arr->deref_array_type == nir_deref_array_type_indirect)
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return true;
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}
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}
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return false;
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}
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static unsigned
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get_io_offset(nir_deref_var *deref, nir_instr *instr, nir_src *indirect,
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struct lower_io_state *state)
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{
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bool found_indirect = false;
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unsigned base_offset = 0;
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nir_builder *b = &state->builder;
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b->cursor = nir_before_instr(instr);
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nir_deref *tail = &deref->deref;
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while (tail->child != NULL) {
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const struct glsl_type *parent_type = tail->type;
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tail = tail->child;
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if (tail->deref_type == nir_deref_type_array) {
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nir_deref_array *deref_array = nir_deref_as_array(tail);
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unsigned size = state->type_size(tail->type);
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base_offset += size * deref_array->base_offset;
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if (deref_array->deref_array_type == nir_deref_array_type_indirect) {
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nir_ssa_def *mul =
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nir_imul(b, nir_imm_int(b, size),
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nir_ssa_for_src(b, deref_array->indirect, 1));
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if (found_indirect) {
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indirect->ssa =
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nir_iadd(b, nir_ssa_for_src(b, *indirect, 1), mul);
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} else {
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indirect->ssa = mul;
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}
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indirect->is_ssa = true;
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found_indirect = true;
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}
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} else if (tail->deref_type == nir_deref_type_struct) {
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nir_deref_struct *deref_struct = nir_deref_as_struct(tail);
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for (unsigned i = 0; i < deref_struct->index; i++) {
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base_offset +=
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state->type_size(glsl_get_struct_field(parent_type, i));
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}
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}
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}
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return base_offset;
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}
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static nir_intrinsic_op
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load_op(nir_variable_mode mode, bool has_indirect)
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{
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nir_intrinsic_op op;
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switch (mode) {
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case nir_var_shader_in:
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op = has_indirect ? nir_intrinsic_load_input_indirect :
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nir_intrinsic_load_input;
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break;
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case nir_var_uniform:
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op = has_indirect ? nir_intrinsic_load_uniform_indirect :
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nir_intrinsic_load_uniform;
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break;
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default:
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unreachable("Unknown variable mode");
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}
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return op;
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}
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static bool
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nir_lower_io_block(nir_block *block, void *void_state)
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{
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struct lower_io_state *state = void_state;
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nir_foreach_instr_safe(block, instr) {
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if (instr->type != nir_instr_type_intrinsic)
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continue;
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nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
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switch (intrin->intrinsic) {
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case nir_intrinsic_load_var: {
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nir_variable_mode mode = intrin->variables[0]->var->data.mode;
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if (mode != nir_var_shader_in && mode != nir_var_uniform)
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continue;
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bool has_indirect = deref_has_indirect(intrin->variables[0]);
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nir_intrinsic_instr *load =
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nir_intrinsic_instr_create(state->mem_ctx,
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load_op(mode, has_indirect));
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load->num_components = intrin->num_components;
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nir_src indirect;
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unsigned offset = get_io_offset(intrin->variables[0],
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&intrin->instr, &indirect, state);
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unsigned location = intrin->variables[0]->var->data.driver_location;
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if (mode == nir_var_uniform) {
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load->const_index[0] = location;
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load->const_index[1] = offset;
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} else {
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load->const_index[0] = location + offset;
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}
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if (has_indirect)
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load->src[0] = indirect;
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if (intrin->dest.is_ssa) {
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nir_ssa_dest_init(&load->instr, &load->dest,
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intrin->num_components, NULL);
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nir_ssa_def_rewrite_uses(&intrin->dest.ssa,
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nir_src_for_ssa(&load->dest.ssa));
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} else {
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nir_dest_copy(&load->dest, &intrin->dest, state->mem_ctx);
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}
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nir_instr_insert_before(&intrin->instr, &load->instr);
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nir_instr_remove(&intrin->instr);
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break;
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}
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case nir_intrinsic_store_var: {
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if (intrin->variables[0]->var->data.mode != nir_var_shader_out)
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continue;
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bool has_indirect = deref_has_indirect(intrin->variables[0]);
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nir_intrinsic_op store_op;
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if (has_indirect) {
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store_op = nir_intrinsic_store_output_indirect;
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} else {
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store_op = nir_intrinsic_store_output;
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}
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nir_intrinsic_instr *store = nir_intrinsic_instr_create(state->mem_ctx,
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store_op);
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store->num_components = intrin->num_components;
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nir_src indirect;
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unsigned offset = get_io_offset(intrin->variables[0],
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&intrin->instr, &indirect, state);
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offset += intrin->variables[0]->var->data.driver_location;
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store->const_index[0] = offset;
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nir_src_copy(&store->src[0], &intrin->src[0], store);
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if (has_indirect)
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store->src[1] = indirect;
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nir_instr_insert_before(&intrin->instr, &store->instr);
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nir_instr_remove(&intrin->instr);
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break;
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}
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default:
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break;
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}
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}
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return true;
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}
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static void
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nir_lower_io_impl(nir_function_impl *impl, int(*type_size)(const struct glsl_type *))
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{
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struct lower_io_state state;
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nir_builder_init(&state.builder, impl);
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state.mem_ctx = ralloc_parent(impl);
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state.type_size = type_size;
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nir_foreach_block(impl, nir_lower_io_block, &state);
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nir_metadata_preserve(impl, nir_metadata_block_index |
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nir_metadata_dominance);
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}
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void
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nir_lower_io(nir_shader *shader, int(*type_size)(const struct glsl_type *))
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{
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nir_foreach_overload(shader, overload) {
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if (overload->impl)
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nir_lower_io_impl(overload->impl, type_size);
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}
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}
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