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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/lang/wgsl/helpers/flatten_bindings.h"
#include <utility>
#include "src/tint/lang/wgsl/ast/transform/binding_remapper.h"
#include "src/tint/lang/wgsl/ast/transform/manager.h"
#include "src/tint/lang/wgsl/inspector/inspector.h"
#include "tint/binding_point.h"
namespace tint::writer {
std::optional<Program> FlattenBindings(const Program* program) {
// TODO(crbug.com/tint/1101): Make this more robust for multiple entry points.
tint::ast::transform::BindingRemapper::BindingPoints binding_points;
uint32_t next_buffer_idx = 0;
uint32_t next_sampler_idx = 0;
uint32_t next_texture_idx = 0;
tint::inspector::Inspector inspector(program);
auto entry_points = inspector.GetEntryPoints();
for (auto& entry_point : entry_points) {
auto bindings = inspector.GetResourceBindings(entry_point.name);
for (auto& binding : bindings) {
BindingPoint src = {binding.bind_group, binding.binding};
if (binding_points.count(src)) {
continue;
}
switch (binding.resource_type) {
case tint::inspector::ResourceBinding::ResourceType::kUniformBuffer:
case tint::inspector::ResourceBinding::ResourceType::kStorageBuffer:
case tint::inspector::ResourceBinding::ResourceType::kReadOnlyStorageBuffer:
binding_points.emplace(src, BindingPoint{0, next_buffer_idx++});
break;
case tint::inspector::ResourceBinding::ResourceType::kSampler:
case tint::inspector::ResourceBinding::ResourceType::kComparisonSampler:
binding_points.emplace(src, BindingPoint{0, next_sampler_idx++});
break;
case tint::inspector::ResourceBinding::ResourceType::kSampledTexture:
case tint::inspector::ResourceBinding::ResourceType::kMultisampledTexture:
case tint::inspector::ResourceBinding::ResourceType::kWriteOnlyStorageTexture:
case tint::inspector::ResourceBinding::ResourceType::kDepthTexture:
case tint::inspector::ResourceBinding::ResourceType::kDepthMultisampledTexture:
case tint::inspector::ResourceBinding::ResourceType::kExternalTexture:
binding_points.emplace(src, BindingPoint{0, next_texture_idx++});
break;
}
}
}
// Run the binding remapper transform.
if (!binding_points.empty()) {
tint::ast::transform::Manager manager;
tint::ast::transform::DataMap inputs;
tint::ast::transform::DataMap outputs;
inputs.Add<tint::ast::transform::BindingRemapper::Remappings>(
std::move(binding_points), tint::ast::transform::BindingRemapper::AccessControls{},
/* mayCollide */ true);
manager.Add<tint::ast::transform::BindingRemapper>();
return manager.Run(program, inputs, outputs);
}
return {};
}
} // namespace tint::writer