118 lines
4.2 KiB
C
118 lines
4.2 KiB
C
/*
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* Copyright © 2015 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.h"
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#include "nir_builder.h"
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static nir_intrinsic_instr *
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as_intrinsic(nir_instr *instr, nir_intrinsic_op op)
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{
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if (instr->type != nir_instr_type_intrinsic)
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return NULL;
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nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
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if (intrin->intrinsic != op)
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return NULL;
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return intrin;
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}
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static nir_intrinsic_instr *
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as_set_vertex_and_primitive_count(nir_instr *instr)
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{
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return as_intrinsic(instr, nir_intrinsic_set_vertex_and_primitive_count);
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}
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/**
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* Count the number of vertices/primitives emitted by a geometry shader per stream.
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* If a constant number of vertices is emitted, the output is set to
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* that number, otherwise it is unknown at compile time and the
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* result will be -1.
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*
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* This only works if you've used nir_lower_gs_intrinsics() to do vertex
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* counting at the NIR level.
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*/
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void
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nir_gs_count_vertices_and_primitives(const nir_shader *shader,
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int *out_vtxcnt,
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int *out_prmcnt,
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unsigned num_streams)
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{
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assert(num_streams);
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int vtxcnt_arr[4] = {-1, -1, -1, -1};
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int prmcnt_arr[4] = {-1, -1, -1, -1};
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bool cnt_found[4] = {false, false, false, false};
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nir_foreach_function(function, shader) {
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if (!function->impl)
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continue;
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/* set_vertex_and_primitive_count intrinsics only appear in predecessors of the
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* end block. So we don't need to walk all of them.
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*/
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set_foreach(function->impl->end_block->predecessors, entry) {
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nir_block *block = (nir_block *) entry->key;
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nir_foreach_instr_reverse(instr, block) {
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nir_intrinsic_instr *intrin = as_set_vertex_and_primitive_count(instr);
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if (!intrin)
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continue;
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unsigned stream = nir_intrinsic_stream_id(intrin);
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if (stream >= num_streams)
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continue;
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int vtxcnt = -1;
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int prmcnt = -1;
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/* If the number of vertices/primitives is compile-time known, we use that,
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* otherwise we leave it at -1 which means that it's unknown.
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*/
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if (nir_src_is_const(intrin->src[0]))
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vtxcnt = nir_src_as_int(intrin->src[0]);
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if (nir_src_is_const(intrin->src[1]))
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prmcnt = nir_src_as_int(intrin->src[1]);
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/* We've found contradictory set_vertex_and_primitive_count intrinsics.
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* This can happen if there are early-returns in main() and
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* different paths emit different numbers of vertices.
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*/
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if (cnt_found[stream] && vtxcnt != vtxcnt_arr[stream])
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vtxcnt = -1;
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if (cnt_found[stream] && prmcnt != prmcnt_arr[stream])
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prmcnt = -1;
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vtxcnt_arr[stream] = vtxcnt;
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prmcnt_arr[stream] = prmcnt;
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cnt_found[stream] = true;
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}
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}
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}
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if (out_vtxcnt)
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memcpy(out_vtxcnt, vtxcnt_arr, num_streams * sizeof(int));
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if (out_prmcnt)
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memcpy(out_prmcnt, prmcnt_arr, num_streams * sizeof(int));
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}
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