shader_library.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.
 
#ifndef FLUTTER_IMPELLER_RENDERER_SHADER_LIBRARY_H_
#define FLUTTER_IMPELLER_RENDERER_SHADER_LIBRARY_H_
 
#include <future>
#include <memory>
#include <string_view>
 
#include "flutter/fml/macros.h"
#include "fml/mapping.h"
#include "impeller/core/shader_types.h"
 
namespace impeller {
 
class Context;
class ShaderFunction;
 
class ShaderLibrary : public std::enable_shared_from_this<ShaderLibrary> {
 public:
  virtual ~ShaderLibrary();
 
  virtual bool IsValid() const = 0;
 
  virtual std::shared_ptr<const ShaderFunction> GetFunction(
      std::string_view name,
      ShaderStage stage) = 0;
 
  using RegistrationCallback = std::function<void(bool)>;
  virtual void RegisterFunction(std::string name,
                                ShaderStage stage,
                                std::shared_ptr<fml::Mapping> code,
                                RegistrationCallback callback);
 
  virtual void UnregisterFunction(std::string name, ShaderStage stage) = 0;
 
 protected:
  ShaderLibrary();
 
 private:
  ShaderLibrary(const ShaderLibrary&) = delete;
 
  ShaderLibrary& operator=(const ShaderLibrary&) = delete;
};
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_RENDERER_SHADER_LIBRARY_H_