context.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_LIB_GPU_CONTEXT_H_
#define FLUTTER_LIB_GPU_CONTEXT_H_
 
#include "dart_api.h"
#include "flutter/lib/gpu/export.h"
#include "flutter/lib/ui/dart_wrapper.h"
#include "impeller/renderer/context.h"
 
namespace flutter {
namespace gpu {
 
bool SupportsNormalOffscreenMSAA(const impeller::Context& context);
 
class Context : public RefCountedDartWrappable<Context> {
  DEFINE_WRAPPERTYPEINFO();
  FML_FRIEND_MAKE_REF_COUNTED(Context);
 
 public:
  static void SetOverrideContext(std::shared_ptr<impeller::Context> context);
 
  static std::shared_ptr<impeller::Context> GetOverrideContext();
 
  static std::shared_ptr<impeller::Context> GetDefaultContext(
      std::optional<std::string>& out_error);
 
  explicit Context(std::shared_ptr<impeller::Context> context);
  ~Context() override;
 
  impeller::Context& GetContext();
 
  std::shared_ptr<impeller::Context>& GetContextShared();
 
 private:
  /// An Impeller context that takes precedent over the IO state context when
  /// set. This is used to inject the context when running with the Impeller
  /// playground, which doesn't instantiate an Engine instance.
  static std::shared_ptr<impeller::Context> default_context_;
 
  std::shared_ptr<impeller::Context> context_;
 
  FML_DISALLOW_COPY_AND_ASSIGN(Context);
};
 
}  // namespace gpu
}  // namespace flutter
 
//----------------------------------------------------------------------------
/// Exports
///
 
extern "C" {
 
FLUTTER_GPU_EXPORT
extern Dart_Handle InternalFlutterGpu_Context_InitializeDefault(
    Dart_Handle wrapper);
 
FLUTTER_GPU_EXPORT
extern int InternalFlutterGpu_Context_GetBackendType(
    flutter::gpu::Context* wrapper);
 
FLUTTER_GPU_EXPORT
extern int InternalFlutterGpu_Context_GetDefaultColorFormat(
    flutter::gpu::Context* wrapper);
 
FLUTTER_GPU_EXPORT
extern int InternalFlutterGpu_Context_GetDefaultStencilFormat(
    flutter::gpu::Context* wrapper);
 
FLUTTER_GPU_EXPORT
extern int InternalFlutterGpu_Context_GetDefaultDepthStencilFormat(
    flutter::gpu::Context* wrapper);
 
FLUTTER_GPU_EXPORT
extern int InternalFlutterGpu_Context_GetMinimumUniformByteAlignment(
    flutter::gpu::Context* wrapper);
 
FLUTTER_GPU_EXPORT
extern bool InternalFlutterGpu_Context_GetSupportsOffscreenMSAA(
    flutter::gpu::Context* wrapper);
 
}  // extern "C"
 
#endif  // FLUTTER_LIB_GPU_CONTEXT_H_