mirror of https://gitlab.freedesktop.org/mesa/mesa
84 lines
3.0 KiB
C
84 lines
3.0 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 bool
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check_location(int location)
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{
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return location == VARYING_SLOT_COL0 ||
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location == VARYING_SLOT_COL1 ||
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location == VARYING_SLOT_BFC0 ||
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location == VARYING_SLOT_BFC1;
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}
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static bool
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lower_input(nir_shader *shader, nir_variable *var)
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{
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if (var->data.interpolation == INTERP_MODE_NONE &&
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check_location(var->data.location))
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var->data.interpolation = INTERP_MODE_FLAT;
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return true;
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}
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static bool
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lower_input_io(nir_builder *b, nir_intrinsic_instr *intr, void *data)
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{
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if (intr->intrinsic != nir_intrinsic_load_interpolated_input)
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return false;;
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nir_io_semantics sem = nir_intrinsic_io_semantics(intr);
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if (!check_location(sem.location))
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return false;
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nir_def *interp = intr->src[0].ssa;
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nir_intrinsic_instr *interp_intr = nir_instr_as_intrinsic(interp->parent_instr);
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if (nir_intrinsic_interp_mode(interp_intr) != INTERP_MODE_NONE)
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return false;
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b->cursor = nir_before_instr(&intr->instr);
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nir_def *load = nir_load_input(b, intr->num_components,
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intr->def.bit_size, intr->src[1].ssa);
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nir_intrinsic_instr *new_intr = nir_instr_as_intrinsic(load->parent_instr);
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nir_intrinsic_copy_const_indices(new_intr, intr);
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nir_def_rewrite_uses(&intr->def, load);
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nir_instr_remove(&intr->instr);
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return true;
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}
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bool
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nir_lower_flatshade(nir_shader *shader)
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{
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bool progress = false;
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if (shader->info.io_lowered) {
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progress = nir_shader_intrinsics_pass(shader, lower_input_io,
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nir_metadata_all, NULL);
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} else {
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nir_foreach_shader_in_variable(var, shader) {
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progress |= lower_input(shader, var);
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}
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}
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/* Interpolation doesn't affect any metadata */
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nir_shader_preserve_all_metadata(shader);
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return progress;
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}
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