2015-09-25 01:01:23 +01:00
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/*
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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_count(nir_instr *instr)
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{
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return as_intrinsic(instr, nir_intrinsic_set_vertex_count);
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}
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/**
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* If a geometry shader emits a constant number of vertices, return the
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* number of vertices. Otherwise, return -1 (unknown).
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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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int
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2015-10-21 01:40:19 +01:00
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nir_gs_count_vertices(const nir_shader *shader)
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2015-09-25 01:01:23 +01:00
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{
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int count = -1;
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2016-04-27 04:26:42 +01:00
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nir_foreach_function(function, shader) {
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2015-12-26 18:00:47 +00:00
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if (!function->impl)
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2015-09-25 01:01:23 +01:00
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continue;
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/* set_vertex_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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struct set_entry *entry;
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2015-12-26 18:00:47 +00:00
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set_foreach(function->impl->end_block->predecessors, entry) {
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2015-09-25 01:01:23 +01:00
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nir_block *block = (nir_block *) entry->key;
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2016-04-27 02:34:19 +01:00
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nir_foreach_instr_reverse(instr, block) {
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2015-09-25 01:01:23 +01:00
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nir_intrinsic_instr *intrin = as_set_vertex_count(instr);
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if (!intrin)
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continue;
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nir_const_value *val = nir_src_as_const_value(intrin->src[0]);
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/* We've found a non-constant value. Bail. */
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if (!val)
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return -1;
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if (count == -1)
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2016-03-16 11:11:34 +00:00
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count = val->i32[0];
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2015-09-25 01:01:23 +01:00
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/* We've found contradictory set_vertex_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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2016-03-16 11:11:34 +00:00
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if (count != val->i32[0])
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2015-09-25 01:01:23 +01:00
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return -1;
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}
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}
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}
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return count;
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}
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