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// Copyright 2020 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.
#ifndef SRC_TINT_WRITER_HLSL_GENERATOR_H_
#define SRC_TINT_WRITER_HLSL_GENERATOR_H_
#include <bitset>
#include <memory>
#include <optional>
#include <string>
#include <unordered_set>
#include <utility>
#include <vector>
#include "src/tint/ast/pipeline_stage.h"
#include "src/tint/reflection.h"
#include "src/tint/sem/binding_point.h"
#include "src/tint/utils/bitset.h"
#include "src/tint/writer/array_length_from_uniform_options.h"
#include "src/tint/writer/text.h"
// Forward declarations
namespace tint {
class Program;
} // namespace tint
namespace tint::writer::hlsl {
/// Configuration options used for generating HLSL.
struct Options {
/// Constructor
Options();
/// Destructor
~Options();
/// Copy constructor
Options(const Options&);
/// Copy assignment
/// @returns this Options
Options& operator=(const Options&);
/// The binding point to use for information passed via root constants.
std::optional<sem::BindingPoint> root_constant_binding_point;
/// Set to `true` to disable workgroup memory zero initialization
bool disable_workgroup_init = false;
/// Set to 'true' to generates binding mappings for external textures
bool generate_external_texture_bindings = false;
/// Options used to specify a mapping of binding points to indices into a UBO
/// from which to load buffer sizes.
ArrayLengthFromUniformOptions array_length_from_uniform = {};
/// Interstage locations actually used as inputs in the next stage of the pipeline.
/// This is potentially used for truncating unused interstage outputs at current shader stage.
std::bitset<16> interstage_locations;
/// Reflect the fields of this class so that it can be used by tint::ForeachField()
TINT_REFLECT(root_constant_binding_point,
disable_workgroup_init,
generate_external_texture_bindings,
array_length_from_uniform);
};
/// The result produced when generating HLSL.
struct Result {
/// Constructor
Result();
/// Destructor
~Result();
/// Copy constructor
Result(const Result&);
/// True if generation was successful.
bool success = false;
/// The errors generated during code generation, if any.
std::string error;
/// The generated HLSL.
std::string hlsl = "";
/// The list of entry points in the generated HLSL.
std::vector<std::pair<std::string, ast::PipelineStage>> entry_points;
/// Indices into the array_length_from_uniform binding that are statically
/// used.
std::unordered_set<uint32_t> used_array_length_from_uniform_indices;
};
/// Generate HLSL for a program, according to a set of configuration options.
/// The result will contain the HLSL, as well as success status and diagnostic
/// information.
/// @param program the program to translate to HLSL
/// @param options the configuration options to use when generating HLSL
/// @returns the resulting HLSL and supplementary information
Result Generate(const Program* program, const Options& options);
} // namespace tint::writer::hlsl
#endif // SRC_TINT_WRITER_HLSL_GENERATOR_H_