| /* |
| * Copyright © 2015 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" |
| |
| static void |
| lower_impl(nir_function_impl *impl) |
| { |
| nir_shader *shader = impl->function->shader; |
| nir_builder b; |
| nir_variable *in, *out; |
| nir_ssa_def *def; |
| |
| nir_builder_init(&b, impl); |
| b.cursor = nir_before_cf_list(&impl->body); |
| |
| /* The edge flag is the last input in st/mesa. */ |
| assert(shader->num_inputs == util_bitcount64(shader->info.inputs_read)); |
| |
| /* Lowered IO only uses intrinsics. It doesn't use variables. */ |
| if (shader->info.io_lowered) { |
| assert(shader->num_outputs == |
| util_bitcount64(shader->info.outputs_written)); |
| |
| /* Load an edge flag. */ |
| nir_intrinsic_instr *load = |
| nir_intrinsic_instr_create(shader, nir_intrinsic_load_input); |
| load->num_components = 1; |
| load->src[0] = nir_src_for_ssa(nir_imm_int(&b, 0)); |
| nir_ssa_dest_init(&load->instr, &load->dest, |
| load->num_components, 32, NULL); |
| |
| nir_intrinsic_set_base(load, shader->num_inputs++); |
| nir_intrinsic_set_component(load, 0); |
| nir_intrinsic_set_dest_type(load, nir_type_float32); |
| |
| nir_io_semantics load_sem = {0}; |
| load_sem.location = VERT_ATTRIB_EDGEFLAG; |
| load_sem.num_slots = 1; |
| nir_intrinsic_set_io_semantics(load, load_sem); |
| nir_builder_instr_insert(&b, &load->instr); |
| |
| /* Store an edge flag. */ |
| nir_intrinsic_instr *store = |
| nir_intrinsic_instr_create(shader, nir_intrinsic_store_output); |
| store->num_components = 1; |
| store->src[0] = nir_src_for_ssa(&load->dest.ssa); |
| store->src[1] = nir_src_for_ssa(nir_imm_int(&b, 0)); |
| |
| nir_intrinsic_set_base(store, shader->num_outputs++); |
| nir_intrinsic_set_component(store, 0); |
| nir_intrinsic_set_src_type(store, nir_type_float32); |
| nir_intrinsic_set_write_mask(store, 0x1); |
| |
| nir_io_semantics semantics = {0}; |
| semantics.location = VARYING_SLOT_EDGE; |
| semantics.num_slots = 1; |
| nir_intrinsic_set_io_semantics(store, semantics); |
| nir_builder_instr_insert(&b, &store->instr); |
| |
| nir_metadata_preserve(impl, nir_metadata_block_index | |
| nir_metadata_dominance); |
| return; |
| } |
| |
| in = nir_variable_create(shader, nir_var_shader_in, |
| glsl_vec4_type(), "edgeflag_in"); |
| in->data.location = VERT_ATTRIB_EDGEFLAG; |
| |
| in->data.driver_location = shader->num_inputs++; |
| shader->info.inputs_read |= BITFIELD64_BIT(VERT_ATTRIB_EDGEFLAG); |
| |
| out = nir_variable_create(shader, nir_var_shader_out, |
| glsl_vec4_type(), "edgeflag_out"); |
| out->data.location = VARYING_SLOT_EDGE; |
| |
| def = nir_load_var(&b, in); |
| nir_store_var(&b, out, def, 0xf); |
| |
| nir_metadata_preserve(impl, nir_metadata_block_index | |
| nir_metadata_dominance); |
| } |
| |
| void nir_lower_passthrough_edgeflags(nir_shader *shader) |
| { |
| lower_impl(nir_shader_get_entrypoint(shader)); |
| } |