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e23b55c3f0
Now that there's a common NIR pass, there's no point in us doing this in the back-end anymore. In order to use this pass in i965, we do have to make one tiny change. Gallium runs the pass after assigning input and output locations and so needs the pass to respect those locations and num_inputs. i965, however, runs it before any location assignment or I/O lowering so we don't care. We do, however, need the pass to succeed with num_inputs == 0 because we set that later. Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11313>
100 lines
3.6 KiB
C
100 lines
3.6 KiB
C
/*
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* Copyright © 2015 Red Hat
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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 FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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static void
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lower_impl(nir_function_impl *impl)
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{
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nir_shader *shader = impl->function->shader;
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nir_builder b;
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nir_variable *in, *out;
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nir_ssa_def *def;
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nir_builder_init(&b, impl);
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b.cursor = nir_before_cf_list(&impl->body);
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/* The edge flag is the last input in st/mesa. This code is also called by
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* i965 which calls it before any input locations are assigned.
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*/
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assert(shader->num_inputs == 0 ||
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shader->num_inputs == util_bitcount64(shader->info.inputs_read));
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/* Lowered IO only uses intrinsics. It doesn't use variables. */
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if (shader->info.io_lowered) {
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assert(shader->num_outputs ==
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util_bitcount64(shader->info.outputs_written));
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/* Load an edge flag. */
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nir_io_semantics load_sem = {0};
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load_sem.location = VERT_ATTRIB_EDGEFLAG;
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load_sem.num_slots = 1;
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nir_ssa_def *load =
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nir_load_input(&b, 1, 32, nir_imm_int(&b, 0),
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.base = shader->num_inputs++,
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.component = 0,
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.dest_type = nir_type_float32,
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.io_semantics = load_sem);
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/* Store an edge flag. */
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nir_io_semantics semantics = {0};
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semantics.location = VARYING_SLOT_EDGE;
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semantics.num_slots = 1;
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nir_store_output(&b, load, nir_imm_int(&b, 0),
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.base = shader->num_outputs++,
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.component = 0,
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.io_semantics = semantics,
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.src_type = nir_type_float32,
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.write_mask = 0x1);
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nir_metadata_preserve(impl, nir_metadata_block_index |
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nir_metadata_dominance);
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return;
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}
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in = nir_variable_create(shader, nir_var_shader_in,
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glsl_vec4_type(), "edgeflag_in");
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in->data.location = VERT_ATTRIB_EDGEFLAG;
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in->data.driver_location = shader->num_inputs++;
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shader->info.inputs_read |= VERT_BIT_EDGEFLAG;
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out = nir_variable_create(shader, nir_var_shader_out,
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glsl_vec4_type(), "edgeflag_out");
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out->data.location = VARYING_SLOT_EDGE;
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shader->info.outputs_written |= VARYING_BIT_EDGE;
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def = nir_load_var(&b, in);
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nir_store_var(&b, out, def, 0xf);
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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 nir_lower_passthrough_edgeflags(nir_shader *shader)
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{
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lower_impl(nir_shader_get_entrypoint(shader));
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}
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