compiler_backend.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#pragma once
 
#include <memory>
#include <variant>
 
#include "flutter/fml/logging.h"
#include "flutter/fml/macros.h"
#include "spirv_glsl.hpp"
#include "spirv_msl.hpp"
#include "spirv_sksl.h"
 
namespace impeller {
namespace compiler {
 
struct CompilerBackend {
  using MSLCompiler = std::shared_ptr<spirv_cross::CompilerMSL>;
  using GLSLCompiler = std::shared_ptr<spirv_cross::CompilerGLSL>;
  using SkSLCompiler = std::shared_ptr<CompilerSkSL>;
  using Compiler = std::variant<MSLCompiler, GLSLCompiler, SkSLCompiler>;
 
  enum class Type {
    kMSL,
    kGLSL,
    kSkSL,
  };
 
  explicit CompilerBackend(MSLCompiler compiler);
 
  explicit CompilerBackend(GLSLCompiler compiler);
 
  explicit CompilerBackend(SkSLCompiler compiler);
 
  CompilerBackend(Type type, Compiler compiler);
 
  CompilerBackend();
 
  ~CompilerBackend();
 
  Type GetType() const;
 
  const spirv_cross::Compiler* operator->() const;
 
  spirv_cross::Compiler* GetCompiler();
 
  operator bool() const;
 
  enum class ExtendedResourceIndex {
    kPrimary,
    kSecondary,
  };
  uint32_t GetExtendedMSLResourceBinding(ExtendedResourceIndex index,
                                         spirv_cross::ID id) const;
 
  const spirv_cross::Compiler* GetCompiler() const;
 
 private:
  Type type_ = Type::kMSL;
  Compiler compiler_;
 
  const spirv_cross::CompilerMSL* GetMSLCompiler() const;
 
  const spirv_cross::CompilerGLSL* GetGLSLCompiler() const;
 
  const CompilerSkSL* GetSkSLCompiler() const;
};
 
}  // namespace compiler
}  // namespace impeller