044e7f6017
Fixes new VKCTS coverage dEQP-VK.glsl.builtin_var.frontfacing.*.
Fixes: af375c6756 ("radv: Optimize fs builtins using static gfx state")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39041>
74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
/*
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* Copyright © 2025 Valve Corporation
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*
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* SPDX-License-Identifier: MIT
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*/
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#include "nir/nir.h"
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#include "nir/nir_builder.h"
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#include "radv_nir.h"
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#include "radv_pipeline_graphics.h"
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typedef struct {
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const struct radv_graphics_state_key *gfx;
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unsigned vgt_outprim_type;
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} opt_fs_builtins_state;
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static bool
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pass(nir_builder *b, nir_intrinsic_instr *intr, void *data)
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{
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opt_fs_builtins_state *state = data;
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b->cursor = nir_before_instr(&intr->instr);
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nir_def *replacement = NULL;
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if (intr->intrinsic == nir_intrinsic_load_front_face || intr->intrinsic == nir_intrinsic_load_front_face_fsign) {
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int force_front_face = 0;
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switch (state->vgt_outprim_type) {
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case V_028A6C_POINTLIST:
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case V_028A6C_LINESTRIP:
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force_front_face = 1;
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break;
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case V_028A6C_TRISTRIP:
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if (state->gfx->rs.cull_mode == VK_CULL_MODE_FRONT_BIT) {
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force_front_face = -1;
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} else if (state->gfx->rs.cull_mode == VK_CULL_MODE_BACK_BIT) {
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force_front_face = 1;
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}
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break;
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default:
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break;
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}
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if (force_front_face) {
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if (intr->intrinsic == nir_intrinsic_load_front_face) {
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replacement = nir_imm_bool(b, force_front_face == 1);
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} else {
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replacement = nir_imm_float(b, force_front_face == 1 ? 1.0 : -1.0);
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}
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}
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} else if (intr->intrinsic == nir_intrinsic_load_sample_id) {
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if (!state->gfx->dynamic_rasterization_samples && state->gfx->ms.rasterization_samples == 0) {
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replacement = nir_imm_intN_t(b, 0, intr->def.bit_size);
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}
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}
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if (!replacement)
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return false;
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nir_def_replace(&intr->def, replacement);
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return true;
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}
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bool
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radv_nir_opt_fs_builtins(nir_shader *shader, const struct radv_graphics_state_key *gfx_state, unsigned vgt_outprim_type)
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{
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opt_fs_builtins_state state = {
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.gfx = gfx_state,
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.vgt_outprim_type = vgt_outprim_type,
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};
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return nir_shader_intrinsics_pass(shader, pass, nir_metadata_control_flow, &state);
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}
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