Texture2DStreamIn_DerivedData.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "Async/ManualResetEvent.h"
#include "Serialization/DerivedData.h"
#include "Texture2DStreamIn.h"
 
namespace UE
{
 
class FTexture2DStreamIn_DerivedData : public FTexture2DStreamIn
{
protected:
    FTexture2DStreamIn_DerivedData(UTexture2D* Texture, bool bHighPriority);
 
    void DoBeginIoRequests(const FContext& Context);
 
    bool DoPollIoRequests(const FContext& Context);
 
    void DoEndIoRequests(const FContext& Context);
 
    void DoCancelIoRequests();
 
    void Abort() final;
 
private:
    FDerivedDataIoResponse Response;
    FManualResetEvent ResponseComplete;
    bool bHighPriority;
};
 
class FTexture2DStreamIn_DerivedData_AsyncCreate final : public FTexture2DStreamIn_DerivedData
{
public:
    FTexture2DStreamIn_DerivedData_AsyncCreate(UTexture2D* Texture, bool bHighPriority);
 
protected:
    // Allocate mips and begin the I/O request for each mip. (AsyncThread)
    void AllocateMipsAndBeginIoRequests(const FContext& Context);
    // Poll the I/O requests. (AsyncThread)
    void PollIoRequests(const FContext& Context);
    // Wait for the I/O requests to complete and clean them up. (AsyncThread)
    void EndIoRequests(const FContext& Context);
    // Async create an intermediate texture from the loaded mips. (AsyncThread)
    void AsyncCreate(const FContext& Context);
    // Apply the intermediate texture and clean up. (RenderThread)
    void Finalize(const FContext& Context);
    // Cancel the update. (RenderThread)
    void Cancel(const FContext& Context);
};
 
class FTexture2DStreamIn_DerivedData_AsyncReallocate final : public FTexture2DStreamIn_DerivedData
{
public:
    FTexture2DStreamIn_DerivedData_AsyncReallocate(UTexture2D* Texture, bool bHighPriority);
 
protected:
    // Create an intermediate bigger copy of the texture. (RenderThread)
    void AsyncReallocate(const FContext& Context);
    // Lock each new mips of the intermediate texture. (RenderThread)
    void LockMips(const FContext& Context);
    // Create load requests into each locked mips. (AsyncThread)
    void LoadMips(const FContext& Context);
    // Unlock the mips, apply the intermediate texture and clean up. (RenderThread)
    void Finalize(const FContext& Context);
    // Unlock the mips, cancel load requests and clean up. (RenderThread)
    void Cancel(const FContext& Context);
};
 
class FTexture2DStreamIn_DerivedData_Virtual final : public FTexture2DStreamIn_DerivedData
{
public:
    FTexture2DStreamIn_DerivedData_Virtual(UTexture2D* Texture, bool bHighPriority);
 
protected:
    // Validate the filename and bulk data, then lock new mips. (RenderThread)
    void LockMips(const FContext& Context);
    // Create load requests into each locked mips. (AsyncThread)
    void LoadMips(const FContext& Context);
    // Clear the IO requests and call Finalize. (AsyncThread)
    void PostLoadMips(const FContext& Context);
    // Apply the intermediate texture and cleanup. (RenderThread)
    void Finalize(const FContext& Context);
    // Unlock the mips, cancel load requests and clean up. (RenderThread)
    void Cancel(const FContext& Context);
};
 
} // UE