141 lines
3.9 KiB
C
141 lines
3.9 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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typedef struct {
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nir_shader *shader;
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nir_builder b;
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} lower_state;
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static bool
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is_color_output(lower_state *state, nir_variable *out)
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{
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switch (state->shader->info.stage) {
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case MESA_SHADER_VERTEX:
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case MESA_SHADER_GEOMETRY:
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case MESA_SHADER_TESS_EVAL:
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switch (out->data.location) {
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case VARYING_SLOT_COL0:
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case VARYING_SLOT_COL1:
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case VARYING_SLOT_BFC0:
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case VARYING_SLOT_BFC1:
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return true;
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default:
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return false;
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}
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break;
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case MESA_SHADER_FRAGMENT:
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return (out->data.location == FRAG_RESULT_COLOR ||
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out->data.location >= FRAG_RESULT_DATA0);
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default:
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return false;
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}
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}
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static bool
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lower_intrinsic(lower_state *state, nir_intrinsic_instr *intr)
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{
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nir_variable *out = NULL;
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nir_builder *b = &state->b;
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nir_ssa_def *s;
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switch (intr->intrinsic) {
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case nir_intrinsic_store_deref:
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out = nir_deref_instr_get_variable(nir_src_as_deref(intr->src[0]));
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break;
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case nir_intrinsic_store_output:
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/* already had i/o lowered.. lookup the matching output var: */
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nir_foreach_shader_out_variable(var, state->shader) {
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int drvloc = var->data.driver_location;
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if (nir_intrinsic_base(intr) == drvloc) {
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out = var;
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break;
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}
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}
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assume(out);
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break;
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default:
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return false;
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}
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if (out->data.mode != nir_var_shader_out)
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return false;
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if (is_color_output(state, out)) {
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b->cursor = nir_before_instr(&intr->instr);
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int src = intr->intrinsic == nir_intrinsic_store_deref ? 1 : 0;
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s = nir_ssa_for_src(b, intr->src[src], intr->num_components);
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s = nir_fsat(b, s);
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nir_instr_rewrite_src(&intr->instr, &intr->src[src], nir_src_for_ssa(s));
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}
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return true;
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}
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static bool
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lower_block(lower_state *state, nir_block *block)
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{
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bool progress = false;
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nir_foreach_instr_safe(instr, block) {
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if (instr->type == nir_instr_type_intrinsic)
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progress |= lower_intrinsic(state, nir_instr_as_intrinsic(instr));
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}
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return progress;
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}
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static bool
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lower_impl(lower_state *state, nir_function_impl *impl)
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{
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nir_builder_init(&state->b, impl);
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bool progress = false;
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nir_foreach_block(block, impl) {
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progress |= lower_block(state, block);
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}
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nir_metadata_preserve(impl, nir_metadata_block_index |
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nir_metadata_dominance);
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return progress;
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}
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bool
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nir_lower_clamp_color_outputs(nir_shader *shader)
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{
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bool progress = false;
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lower_state state = {
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.shader = shader,
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};
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nir_foreach_function(function, shader) {
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if (function->impl)
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progress |= lower_impl(&state, function->impl);
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}
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return progress;
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}
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