qssgrendershadowmap_p.h

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// Copyright (C) 2008-2012 NVIDIA Corporation.
// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
#ifndef QSSG_RENDER_SHADOW_MAP_H
#define QSSG_RENDER_SHADOW_MAP_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <QtQuick3DRuntimeRender/private/qtquick3druntimerenderglobal_p.h>
#include <QtGui/QMatrix4x4>
#include <QtGui/QVector3D>
#include <QtQuick3DUtils/private/qssgrenderbasetypes_p.h>
 
QT_BEGIN_NAMESPACE
 
class QSSGRhiContext;
class QSSGRenderContextInterface;
 
class QRhiRenderBuffer;
class QRhiTextureRenderTarget;
class QRhiRenderPassDescriptor;
class QRhiTexture;
 
enum class ShadowMapModes
{
    VSM, 
    CUBE, 
};
 
struct QSSGShadowMapEntry
{
    QSSGShadowMapEntry();
 
    static QSSGShadowMapEntry withRhiDepthMap(quint32 lightIdx,
                                              ShadowMapModes mode,
                                              QRhiTexture *depthMap,
                                              QRhiTexture *depthCopy,
                                              QRhiRenderBuffer *depthStencil);
 
    static QSSGShadowMapEntry withRhiDepthCubeMap(quint32 lightIdx,
                                                  ShadowMapModes mode,
                                                  QRhiTexture *depthCube,
                                                  QRhiTexture *cubeCopy,
                                                  QRhiRenderBuffer *depthStencil);
 
    void destroyRhiResources();
 
    quint32 m_lightIndex; 
    ShadowMapModes m_shadowMapMode; 
 
    // RHI resources
    QRhiTexture *m_rhiDepthMap = nullptr; // shadow map (VSM)
    QRhiTexture *m_rhiDepthCopy = nullptr; // for blur pass (VSM)
    QRhiTexture *m_rhiDepthCube = nullptr; // shadow cube map (CUBE)
    QRhiTexture *m_rhiCubeCopy = nullptr; // for blur pass (CUBE)
    QRhiRenderBuffer *m_rhiDepthStencil = nullptr; // depth/stencil
    QVarLengthArray<QRhiTextureRenderTarget *, 6> m_rhiRenderTargets; // texture RT
    QRhiRenderPassDescriptor *m_rhiRenderPassDesc = nullptr; // texture RT renderpass descriptor
    QRhiTextureRenderTarget *m_rhiBlurRenderTarget0 = nullptr; // texture RT for blur X (targets depthCopy or cubeCopy)
    QRhiTextureRenderTarget *m_rhiBlurRenderTarget1 = nullptr; // texture RT for blur Y (targets depthMap or depthCube)
    QRhiRenderPassDescriptor *m_rhiBlurRenderPassDesc = nullptr; // blur needs its own because no depth/stencil
 
    QMatrix4x4 m_lightVP; 
    QMatrix4x4 m_lightCubeView[6]; 
    QMatrix4x4 m_lightView; 
};
 
class Q_QUICK3DRUNTIMERENDER_EXPORT QSSGRenderShadowMap
{
    typedef QVector<QSSGShadowMapEntry> TShadowMapEntryList;
    Q_DISABLE_COPY(QSSGRenderShadowMap)
 
public:
    const QSSGRenderContextInterface &m_context;
 
    explicit QSSGRenderShadowMap(const QSSGRenderContextInterface &inContext);
    ~QSSGRenderShadowMap();
    void releaseCachedResources();
 
    void addShadowMapEntry(qint32 lightIdx,
                           qint32 width,
                           qint32 height,
                           ShadowMapModes mode,
                           const QString &renderNodeObjName);
 
    QSSGShadowMapEntry *shadowMapEntry(int lightIdx);
 
    qint32 shadowMapEntryCount() { return m_shadowMapList.size(); }
 
private:
    TShadowMapEntryList m_shadowMapList;
};
 
using QSSGRenderShadowMapPtr = std::shared_ptr<QSSGRenderShadowMap>;
 
QT_END_NAMESPACE
 
#endif