src/dawn/native/SharedBufferMemory.h

// Copyright 2024 The Dawn & Tint Authors
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#ifndef SRC_DAWN_NATIVE_SHAREDBUFFERMEMORY_H_
#define SRC_DAWN_NATIVE_SHAREDBUFFERMEMORY_H_

#include "dawn/common/WeakRef.h"
#include "dawn/common/WeakRefSupport.h"
#include "dawn/native/Error.h"
#include "dawn/native/Forward.h"
#include "dawn/native/ObjectBase.h"
#include "dawn/native/SharedFence.h"
#include "dawn/native/dawn_platform.h"

namespace dawn::native {

class SharedBufferMemoryContents;
struct SharedBufferMemoryDescriptor;
struct SharedBufferMemoryBeginAccessDescriptor;
struct SharedBufferMemoryEndAccessState;
struct SharedBufferMemoryProperties;
struct BufferDescriptor;

class SharedBufferMemoryBase : public ApiObjectBase, public WeakRefSupport<SharedBufferMemoryBase> {
  public:
    using BeginAccessDescriptor = SharedBufferMemoryBeginAccessDescriptor;
    using EndAccessState = SharedBufferMemoryEndAccessState;

    static SharedBufferMemoryBase* MakeError(DeviceBase* device,
                                             const SharedBufferMemoryDescriptor* descriptor);

    void Initialize();

    void APIGetProperties(SharedBufferMemoryProperties* properties) const;
    BufferBase* APICreateBuffer(const BufferDescriptor* descriptor);
    // Returns true if access was acquired. If it returns true, then APIEndAccess must
    // be called to release access. Other errors may occur even if `true` is returned.
    // Use an error scope to catch them.
    bool APIBeginAccess(BufferBase* buffer, const BeginAccessDescriptor* descriptor);
    // Returns true if access was released.
    bool APIEndAccess(BufferBase* buffer, EndAccessState* state);
    // Returns true iff the device passed to this object on creation is now lost.
    // TODO(crbug.com/1506468): Eliminate this API once Chromium has been
    // transitioned away from using it in favor of observing device lost events.
    bool APIIsDeviceLost();

    ObjectType GetType() const override;

    SharedBufferMemoryContents* GetContents() const;

  protected:
    SharedBufferMemoryBase(DeviceBase* device,
                           const char* label,
                           const SharedBufferMemoryProperties& properties);
    SharedBufferMemoryBase(DeviceBase* device,
                           const SharedBufferMemoryDescriptor* descriptor,
                           ObjectBase::ErrorTag tag);

    void DestroyImpl() override;

    SharedBufferMemoryProperties mProperties;

  private:
    virtual Ref<SharedBufferMemoryContents> CreateContents();

    ResultOrError<Ref<BufferBase>> CreateBuffer(const BufferDescriptor* rawDescriptor);

    virtual ResultOrError<Ref<BufferBase>> CreateBufferImpl(
        const UnpackedPtr<BufferDescriptor>& descriptor) = 0;

    Ref<SharedBufferMemoryContents> mContents;
};

class SharedBufferMemoryContents : public RefCounted {
  public:
    explicit SharedBufferMemoryContents(WeakRef<SharedBufferMemoryBase> sharedBufferMemory);

    const WeakRef<SharedBufferMemoryBase>& GetSharedBufferMemory() const;

  private:
    WeakRef<SharedBufferMemoryBase> mSharedBufferMemory;
};

}  // namespace dawn::native

#endif  // SRC_DAWN_NATIVE_SHAREDBUFFERMEMORY_H_