110 lines
3.9 KiB
C
110 lines
3.9 KiB
C
/*
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* Copyright © 2016 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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#include "nir_builder.h"
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#include "program/prog_instruction.h"
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static nir_variable *
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make_uniform(nir_shader *nir, const gl_state_index16 *tokens)
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{
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/* Note: name must be prefixed with "gl_" to trigger slot based
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* special handling in uniform setup.
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*/
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nir_variable *var =
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nir_variable_create(nir, nir_var_uniform, glsl_int_type(),
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"gl_PatchVerticesIn");
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var->num_state_slots = 1;
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var->state_slots = ralloc_array(var, nir_state_slot, var->num_state_slots);
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memcpy(var->state_slots[0].tokens, tokens, sizeof(*tokens) * STATE_LENGTH);
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var->state_slots[0].swizzle = SWIZZLE_XXXX;
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return var;
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}
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/**
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* This pass lowers the load_patch_vertices_in intrinsic.
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*
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* - If we statically know the value, we lower it to a constant.
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* (If a TES is linked against a TCS, the TCS tells us the TES input count.)
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*
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* - If not, and we're given Mesa state slots, we lower it to a uniform.
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*
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* - Otherwise, we leave it as a system value.
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*
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* This pass must be run after nir_lower_system_values().
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*/
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bool
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nir_lower_patch_vertices(nir_shader *nir,
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unsigned static_count,
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const gl_state_index16 *uniform_state_tokens)
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{
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bool progress = false;
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nir_variable *var = NULL;
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/* If there's no static count and we don't want uniforms, there's no
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* lowering to do...just bail early.
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*/
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if (static_count == 0 && !uniform_state_tokens)
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return false;
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nir_foreach_function(function, nir) {
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if (function->impl) {
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nir_foreach_block(block, function->impl) {
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nir_builder b;
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nir_builder_init(&b, function->impl);
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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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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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if (intr->intrinsic != nir_intrinsic_load_patch_vertices_in)
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continue;
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b.cursor = nir_before_instr(&intr->instr);
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nir_ssa_def *val = NULL;
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if (static_count) {
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val = nir_imm_int(&b, static_count);
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} else {
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if (!var)
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var = make_uniform(nir, uniform_state_tokens);
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val = nir_load_var(&b, var);
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}
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progress = true;
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nir_ssa_def_rewrite_uses(&intr->dest.ssa,
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val);
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nir_instr_remove(instr);
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}
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}
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}
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if (progress) {
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nir_metadata_preserve(function->impl, nir_metadata_block_index |
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nir_metadata_dominance);
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}
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}
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}
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return progress;
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}
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