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ff6e3e9f76
The result of nir_slot_is_varying depends on what the next shader stage is, and nir_remove_sysval_output uses it. Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32855>
53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
/*
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* Copyright 2024 Valve Corporation
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* SPDX-License-Identifier: MIT
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*/
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#include "nir.h"
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#include "nir_builder.h"
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/**
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* If a clip/cull distance is constant >= 0,
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* we know that it will never cause clipping/culling.
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* Remove the sysval_output in that case.
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*
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* Assumes that nir_lower_io_to_temporaries was run,
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* and works best with scalar store_outputs.
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*/
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static bool
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opt_clip_cull(nir_builder *b, nir_intrinsic_instr *intr, void *unused)
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{
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if (intr->intrinsic != nir_intrinsic_store_output)
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return false;
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const nir_io_semantics io_sem = nir_intrinsic_io_semantics(intr);
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const unsigned location = io_sem.location;
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if (io_sem.no_sysval_output)
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return false;
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if (location != VARYING_SLOT_CLIP_DIST0 && location != VARYING_SLOT_CLIP_DIST1)
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return false;
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nir_def *val = intr->src[0].ssa;
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for (unsigned i = 0; i < val->num_components; i++) {
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nir_scalar s = nir_scalar_resolved(val, i);
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if (!nir_scalar_is_const(s))
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return false;
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float distance = nir_scalar_as_float(s);
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/* NaN gets clipped, and INF after interpolation is NaN. */
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if (isnan(distance) || distance < 0.0 || distance == INFINITY)
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return false;
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}
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nir_remove_sysval_output(intr, MESA_SHADER_FRAGMENT);
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return true;
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}
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bool
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nir_opt_clip_cull_const(nir_shader *shader)
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{
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return nir_shader_intrinsics_pass(shader, opt_clip_cull, nir_metadata_control_flow, NULL);
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}
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