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2b62738b9b
Introduce a new NIR pass called nir_remove_outputs which works on lowered I/O intrinsics and can remove any output varying or sysval. This is meant to replace custom solutions in drivers, such as radv_remove_varyings and similar. Signed-off-by: Timur Kristóf <timur.kristof@gmail.com> Reviewed-by: Georg Lehmann <dadschoorse@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33928>
93 lines
3.3 KiB
C
93 lines
3.3 KiB
C
/*
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* Copyright © 2025 Valve 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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* Authors:
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* Timur Kristóf
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*
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*/
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#include "nir_builder.h"
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typedef struct {
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mesa_shader_stage next_stage;
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uint64_t remove_varying;
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uint64_t remove_sysval;
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} nir_remove_outputs_state;
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static bool
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try_remove_shader_output_write(nir_builder *b, nir_intrinsic_instr *intrin, void *state)
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{
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if (intrin->intrinsic != nir_intrinsic_store_output &&
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intrin->intrinsic != nir_intrinsic_store_per_vertex_output &&
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intrin->intrinsic != nir_intrinsic_store_per_primitive_output)
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return false;
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const nir_remove_outputs_state *s = (nir_remove_outputs_state *) state;
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const nir_io_semantics io_sem = nir_intrinsic_io_semantics(intrin);
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if (io_sem.location > VARYING_SLOT_VAR31)
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return false;
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const uint64_t bit = BITFIELD64_BIT(io_sem.location);
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bool progress = false;
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if (!io_sem.no_varying && (bit & s->remove_varying)) {
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nir_remove_varying(intrin, s->next_stage);
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progress = true;
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}
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if (!io_sem.no_sysval_output && (bit & s->remove_sysval)) {
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nir_remove_sysval_output(intrin, s->next_stage);
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progress = true;
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}
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return progress;
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}
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/**
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* This pass can remove shader output writes
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* while differentiating between sysval outputs and varyings.
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* Does not work on generic per-patch and dedicated 16-bit output slots.
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*
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* Intended use cases:
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* - Remove all varyings from the pre-rasterization stage for depth-only rendering.
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* - Remove varyings but keep them as sysvals or vice versa.
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* - Remove sysvals when they are not needed.
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*/
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bool
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nir_remove_outputs(nir_shader *shader, mesa_shader_stage next_stage,
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uint64_t remove_varying, uint64_t remove_sysval)
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{
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nir_remove_outputs_state state = {
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.next_stage = next_stage,
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.remove_varying = remove_varying,
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.remove_sysval = remove_sysval,
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};
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if (next_stage == MESA_SHADER_FRAGMENT) {
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/* These are always sysvals but never varyings, ie. can't be read by FS. */
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state.remove_varying |= VARYING_BIT_LAYER | VARYING_BIT_PSIZ | VARYING_BIT_EDGE;
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}
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return nir_shader_intrinsics_pass(shader, try_remove_shader_output_write,
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nir_metadata_control_flow, &state);
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}
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