// 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_SPIRV_GENERATOR_H_
#define SRC_TINT_WRITER_SPIRV_GENERATOR_H_

#include <memory>
#include <string>
#include <vector>

#include "src/tint/reflection.h"
#include "src/tint/writer/external_texture_options.h"
#include "src/tint/writer/writer.h"

// Forward declarations
namespace tint {
class Program;
}
namespace tint::writer::spirv {
class Builder;
class BinaryWriter;
}  // namespace tint::writer::spirv

namespace tint::writer::spirv {

/// Configuration options used for generating SPIR-V.
struct Options {
    /// Set to `true` to disable software robustness that prevents out-of-bounds accesses.
    bool disable_robustness = false;

    /// Set to `true` to generate a PointSize builtin and have it set to 1.0
    /// from all vertex shaders in the module.
    bool emit_vertex_point_size = true;

    /// 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 in the binding mappings for external textures
    ExternalTextureOptions external_texture_options = {};

    /// Set to `true` to initialize workgroup memory with OpConstantNull when
    /// VK_KHR_zero_initialize_workgroup_memory is enabled.
    bool use_zero_initialize_workgroup_memory_extension = false;

    /// Reflect the fields of this class so that it can be used by tint::ForeachField()
    TINT_REFLECT(disable_robustness,
                 emit_vertex_point_size,
                 disable_workgroup_init,
                 generate_external_texture_bindings,
                 external_texture_options,
                 use_zero_initialize_workgroup_memory_extension);
};

/// The result produced when generating SPIR-V.
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 SPIR-V.
    std::vector<uint32_t> spirv;
};

/// Generate SPIR-V for a program, according to a set of configuration options.
/// The result will contain the SPIR-V, as well as success status and diagnostic
/// information.
/// @param program the program to translate to SPIR-V
/// @param options the configuration options to use when generating SPIR-V
/// @returns the resulting SPIR-V and supplementary information
Result Generate(const Program* program, const Options& options);

}  // namespace tint::writer::spirv

#endif  // SRC_TINT_WRITER_SPIRV_GENERATOR_H_