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