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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_LIB_GPU_SHADER_LIBRARY_H_
#define FLUTTER_LIB_GPU_SHADER_LIBRARY_H_
#include <memory>
#include <string>
#include <unordered_map>
#include "flutter/lib/gpu/export.h"
#include "flutter/lib/gpu/shader.h"
#include "flutter/lib/ui/dart_wrapper.h"
#include "fml/memory/ref_ptr.h"
namespace flutter {
namespace gpu {
/// An immutable collection of shaders loaded from a shader bundle asset.
class ShaderLibrary : public RefCountedDartWrappable<ShaderLibrary> {
DEFINE_WRAPPERTYPEINFO();
FML_FRIEND_MAKE_REF_COUNTED(ShaderLibrary);
public:
using ShaderMap = std::unordered_map<std::string, fml::RefPtr<Shader>>;
static fml::RefPtr<ShaderLibrary> MakeFromAsset(
impeller::Context::BackendType backend_type,
const std::string& name,
std::string& out_error);
static fml::RefPtr<ShaderLibrary> MakeFromShaders(ShaderMap shaders);
static fml::RefPtr<ShaderLibrary> MakeFromFlatbuffer(
impeller::Context::BackendType backend_type,
std::shared_ptr<fml::Mapping> payload);
/// Sets a return override for `MakeFromAsset` for testing purposes.
static void SetOverride(fml::RefPtr<ShaderLibrary> override_shader_library);
fml::RefPtr<Shader> GetShader(const std::string& shader_name,
Dart_Handle shader_wrapper) const;
~ShaderLibrary() override;
private:
/// A global override used to inject a ShaderLibrary when running with the
/// Impeller playground. When set, `MakeFromAsset` will always just return
/// this library.
static fml::RefPtr<ShaderLibrary> override_shader_library_;
std::shared_ptr<fml::Mapping> payload_;
ShaderMap shaders_;
explicit ShaderLibrary(std::shared_ptr<fml::Mapping> payload,
ShaderMap shaders);
FML_DISALLOW_COPY_AND_ASSIGN(ShaderLibrary);
};
} // namespace gpu
} // namespace flutter
//----------------------------------------------------------------------------
/// Exports
///
extern "C" {
FLUTTER_GPU_EXPORT
extern Dart_Handle InternalFlutterGpu_ShaderLibrary_InitializeWithAsset(
Dart_Handle wrapper,
Dart_Handle asset_name);
FLUTTER_GPU_EXPORT
extern Dart_Handle InternalFlutterGpu_ShaderLibrary_GetShader(
flutter::gpu::ShaderLibrary* wrapper,
Dart_Handle shader_name,
Dart_Handle shader_wrapper);
} // extern "C"
#endif // FLUTTER_LIB_GPU_SHADER_LIBRARY_H_