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

// Qt-Security score:significant reason:default

#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>

#include <QtQuick3DRuntimeRender/private/qssgrenderableobjects_p.h>

QT_BEGIN_NAMESPACE

class QSSGRhiContext;

class QSSGRenderContextInterface;

class QRhiRenderBuffer;

class QRhiTextureRenderTarget;

class QRhiRenderPassDescriptor;

class QRhiTexture;

struct QSSGShadowMapEntry

    QSSGShadowMapEntry();

    static QSSGShadowMapEntry withAtlas(quint32 lightIdx);

    void destroyRhiResources();

    quint32 m_lightIndex; ///< the light index it belongs to

    quint32 m_depthArrayIndex = 0; ///< shadow map texture array index

    // Owned RHI Resoruces (just for point lights)

    QRhiTexture *m_rhiDepthCube = nullptr; // shadow cube map

    QRhiRenderBuffer *m_rhiDepthStencilCube = nullptr;

    QRhiRenderPassDescriptor *m_rhiRenderPassDescCube = nullptr;

    std::array<QRhiTextureRenderTarget *, 6> m_rhiRenderTargetCube = {};

    QRhiShaderResourceBindings *m_cubeToAtlasFrontSrb = nullptr;

    QRhiShaderResourceBindings *m_cubeToAtlasBackSrb = nullptr;

    // Shared RHI Resources

    std::array<QRhiTextureRenderTarget *, 4> m_rhiRenderTargets = {};

    std::array<QRhiRenderPassDescriptor *, 4> m_rhiRenderPassDesc = {};

    QMatrix4x4 m_lightViewProjection[4]; ///< light view projection matrix

    QMatrix4x4 m_lightCubeView[6]; ///< light cubemap view matrices

    QMatrix4x4 m_lightView; ///< light view transform

    quint32 m_csmNumSplits = 0;

    float m_csmSplits[4] = {};

    float m_csmActive[4] = {};

    float m_shadowMapFar = 0.f;

    QMatrix4x4 m_fixedScaleBiasMatrix[4];

    QVector4D m_dimensionsInverted[4]; ///< (x, y, z, 0) 4 vec4

    struct AtlasEntry {

        int layerIndex = 0;

        float uOffset = 0.0f;

        float vOffset = 0.0f;

        float uvScale = 1.0f;

    } m_atlasInfo[4];

};

class Q_QUICK3DRUNTIMERENDER_EXPORT QSSGRenderShadowMap

    Q_DISABLE_COPY(QSSGRenderShadowMap)

public:

    const QSSGRenderContextInterface &m_context;

    explicit QSSGRenderShadowMap(const QSSGRenderContextInterface &inContext);

    ~QSSGRenderShadowMap();

    void releaseCachedResources();

    void addShadowMaps(const QSSGShaderLightList &renderableLights);

    QSSGShadowMapEntry *shadowMapEntry(int lightIdx);

    QRhiTextureRenderTarget *layerRenderTarget(int layerIndex);

    QRhiRenderPassDescriptor *layerRenderPassDescriptor(int layerIndex);

    QRhiTexture *shadowMapAtlasTexture() const;

    QRhiTexture *shadowMapBlueNoiseTexture() const;

    qsizetype shadowMapEntryCount() { return m_shadowMapList.size(); }

    QRhiShaderResourceBindings *shadowClearSrb() const { return m_shadowClearSrb.get(); }

private:

    QSSGShadowMapEntry *addShadowMap(quint32 lightIdx,

                                     QSize size,

                                     QVector<QSSGShadowMapEntry::AtlasEntry> atlasEntries,

                                     quint32 csmNumSplits,

                                     QRhiTexture::Format format,

                                     bool isPointLight,

                                     const QString &renderNodeObjName);

    QVector<QSSGShadowMapEntry> m_shadowMapList;

    std::unique_ptr<QRhiTexture> m_shadowMapAtlasTexture;

    std::unique_ptr<QRhiTexture> m_shadowMapBlueNoiseTexture;

    std::unique_ptr<QRhiSampler> m_sharedCubeToAtlasSampler;

    std::unique_ptr<QRhiBuffer> m_sharedFrontCubeToAtlasUniformBuffer;

    std::unique_ptr<QRhiBuffer> m_sharedBackCubeToAtlasUniformBuffer;

    std::unique_ptr<QRhiShaderResourceBindings> m_shadowClearSrb;

    QVector<QRhiRenderBuffer *> m_layerDepthStencilBuffers;

    QVector<QRhiTextureRenderTarget *> m_layerRenderTargets;

    QVector<QRhiRenderPassDescriptor *> m_layerRenderPassDescriptors;

};

using QSSGRenderShadowMapPtr = std::shared_ptr<QSSGRenderShadowMap>;

QT_END_NAMESPACE

#endif