textureObject.h

//
// Copyright 2020 Pixar
//
// Licensed under the terms set forth in the LICENSE.txt file available at
// https://openusd.org/license.
//
#ifndef PXR_IMAGING_HD_ST_TEXTURE_OBJECT_H
#define PXR_IMAGING_HD_ST_TEXTURE_OBJECT_H
 
#include "pxr/pxr.h"
#include "pxr/imaging/hdSt/api.h"
 
#include "pxr/imaging/hdSt/textureIdentifier.h"
#include "pxr/imaging/hdSt/enums.h"
#include "pxr/imaging/hd/types.h"
 
#include "pxr/imaging/hgi/handle.h"
#include "pxr/imaging/hio/image.h"
 
#include "pxr/base/gf/bbox3d.h"
#include "pxr/base/tf/declarePtrs.h"
 
#include <memory>
 
PXR_NAMESPACE_OPEN_SCOPE
 
class Hgi;
using HgiTextureHandle = HgiHandle<class HgiTexture>;
class HdSt_TextureObjectRegistry;
struct HgiTextureDesc;
class HdStTextureCpuData;
class HdStResourceRegistry;
 
using HdStTextureObjectSharedPtr = std::shared_ptr<class HdStTextureObject>;
 
class HdStTextureObject :
            public std::enable_shared_from_this<HdStTextureObject>
{
public:
    const HdStTextureIdentifier &
    GetTextureIdentifier() const { return _textureId; }
 
    size_t GetTargetMemory() const { return _targetMemory; }
 
    HDST_API
    void SetTargetMemory(size_t);
 
    HDST_API
    virtual size_t GetCommittedSize() const = 0;
 
    HDST_API
    virtual bool IsValid() const = 0;
 
    HDST_API
    virtual HdStTextureType GetTextureType() const = 0;
 
    HDST_API
    virtual ~HdStTextureObject();
 
protected:
    HdStTextureObject(
        const HdStTextureIdentifier &textureId,
        HdSt_TextureObjectRegistry * textureObjectRegistry);
 
    HDST_API
    HdStResourceRegistry* _GetResourceRegistry() const;
 
    HDST_API
    Hgi* _GetHgi() const;
    
    HDST_API
    std::string _GetDebugName(const HdStTextureIdentifier &textureId) const;
 
    HDST_API
    bool
    _GetPremultiplyAlpha(const HdStSubtextureIdentifier * const subId) const;
 
    HDST_API
    HioImage::SourceColorSpace
    _GetSourceColorSpace(const HdStSubtextureIdentifier * const subId) const;
 
    HDST_API
    virtual void _Load() = 0;
 
    HDST_API
    virtual void _Commit() = 0;
 
    HDST_API
    void _AdjustTotalTextureMemory(int64_t memDiff);
 
    HDST_API
    void _AddToTotalTextureMemory(const HgiTextureHandle &texture);
 
    HDST_API
    void _SubtractFromTotalTextureMemory(const HgiTextureHandle &texture);
 
private:
    friend class HdSt_TextureObjectRegistry;
 
    HdSt_TextureObjectRegistry * const _textureObjectRegistry;
    const HdStTextureIdentifier _textureId;
    size_t _targetMemory;
};
 
class HdStUvTextureObject : public HdStTextureObject
{
public:
    HDST_API
    ~HdStUvTextureObject() override;
 
    HgiTextureHandle const &GetTexture() const {
        return _gpuTexture;
    }
 
    const std::pair<HdWrap, HdWrap> &GetWrapParameters() const {
        return _wrapParameters;
    }
 
    HDST_API
    HdStTextureType GetTextureType() const override final;
 
    HDST_API
    size_t GetCommittedSize() const override;
 
protected:
    HDST_API
    HdStUvTextureObject(
        const HdStTextureIdentifier &textureId,
        HdSt_TextureObjectRegistry * textureObjectRegistry);
 
    HDST_API
    void _SetWrapParameters(
        const std::pair<HdWrap, HdWrap> &wrapParameters);
 
    HDST_API
    void _SetCpuData(std::unique_ptr<HdStTextureCpuData> &&);
    HDST_API
    HdStTextureCpuData * _GetCpuData() const;
 
    HDST_API
    void _CreateTexture(const HgiTextureDesc &desc);
    HDST_API
    void _GenerateMipmaps();
    HDST_API
    void _DestroyTexture();
 
private:
    std::pair<HdWrap, HdWrap> _wrapParameters;
    std::unique_ptr<HdStTextureCpuData> _cpuData;
    HgiTextureHandle _gpuTexture;
    HdStTextureType _textureType;
};
 
class HdStAssetUvTextureObject final : public HdStUvTextureObject
{
public:
    HDST_API
    HdStAssetUvTextureObject(
        const HdStTextureIdentifier &textureId,
        HdSt_TextureObjectRegistry *textureObjectRegistry);
 
    HDST_API
    ~HdStAssetUvTextureObject() override;
 
    HDST_API
    bool IsValid() const override;
 
protected:
    HDST_API
    void _Load() override;
 
    HDST_API
    void _Commit() override;
 
private:
    bool _valid;
};
 
class HdStFieldTextureObject final : public HdStTextureObject
{
public:
    HDST_API
    HdStFieldTextureObject(
        const HdStTextureIdentifier &textureId,
        HdSt_TextureObjectRegistry *textureObjectRegistry);
 
    HDST_API
    ~HdStFieldTextureObject() override;
 
    HgiTextureHandle const &GetTexture() const {
        return _gpuTexture;
    }
 
    const GfBBox3d &GetBoundingBox() const { return _bbox; }
 
    const GfMatrix4d &GetSamplingTransform() const {
        return _samplingTransform;
    }
 
    HDST_API
    bool IsValid() const override;
 
    HDST_API
    HdStTextureType GetTextureType() const override;
 
    HDST_API
    size_t GetCommittedSize() const override;
 
protected:
    HDST_API
    void _Load() override;
 
    HDST_API
    void _Commit() override;
 
private:
    std::unique_ptr<HdStTextureCpuData> _cpuData;
    GfBBox3d _bbox;
    GfMatrix4d _samplingTransform;
    HgiTextureHandle _gpuTexture;
    bool _valid;
};
 
template<HdStTextureType textureType>
struct HdSt_TypedTextureObjectHelper;
 
template<HdStTextureType textureType>
using HdStTypedTextureObject =
    typename HdSt_TypedTextureObjectHelper<textureType>::type;
 
template<>
struct HdSt_TypedTextureObjectHelper<HdStTextureType::Uv> {
    using type = HdStUvTextureObject;
};
 
template<>
struct HdSt_TypedTextureObjectHelper<HdStTextureType::Field> {
    using type = HdStFieldTextureObject;
};
 
template<>
struct HdSt_TypedTextureObjectHelper<HdStTextureType::Cubemap> {
    using type = HdStUvTextureObject;
};
 
PXR_NAMESPACE_CLOSE_SCOPE
 
#endif