60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
// Copyright 2022 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "src/tint/writer/generate_external_texture_bindings.h"
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#include <algorithm>
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#include <unordered_map>
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#include <vector>
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#include "src/tint/ast/external_texture.h"
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#include "src/tint/ast/module.h"
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#include "src/tint/program.h"
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#include "src/tint/sem/external_texture.h"
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#include "src/tint/sem/variable.h"
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namespace tint::writer {
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transform::MultiplanarExternalTexture::BindingsMap GenerateExternalTextureBindings(
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const Program* program) {
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// TODO(tint:1491): Use Inspector once we can get binding info for all
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// variables, not just those referenced by entry points.
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// Collect next valid binding number per group
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std::unordered_map<uint32_t, uint32_t> group_to_next_binding_number;
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std::vector<sem::BindingPoint> ext_tex_bps;
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for (auto* var : program->AST().GlobalVariables()) {
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if (auto* sem_var = program->Sem().Get(var)->As<sem::GlobalVariable>()) {
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auto bp = sem_var->BindingPoint();
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auto& n = group_to_next_binding_number[bp.group];
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n = std::max(n, bp.binding + 1);
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if (sem_var->Type()->UnwrapRef()->Is<sem::ExternalTexture>()) {
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ext_tex_bps.emplace_back(bp);
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}
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}
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}
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transform::MultiplanarExternalTexture::BindingsMap new_bindings_map;
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for (auto bp : ext_tex_bps) {
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uint32_t g = bp.group;
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uint32_t& next_num = group_to_next_binding_number[g];
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auto new_bps = transform::BindingPoints{{g, next_num++}, {g, next_num++}};
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new_bindings_map[bp] = new_bps;
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}
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return new_bindings_map;
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}
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} // namespace tint::writer
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