qquick3dscenerenderer_p.h

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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
#ifndef QSSGSCENERENDERER_H
#define QSSGSCENERENDERER_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/qssgrendercontextcore_p.h>
 
#include <qsgtextureprovider.h>
#include <qsgrendernode.h>
#include <QSGSimpleTextureNode>
 
#include <QtQuick3D/private/qquick3dviewport_p.h>
#include <QtQuick3DRuntimeRender/private/qssgrenderlayer_p.h>
#include <QtQuick3DRuntimeRender/private/qssgrhieffectsystem_p.h>
#include <QtQuick3DRuntimeRender/private/qssgrenderer_p.h>
 
#include <optional>
 
#include "qquick3dsceneenvironment_p.h"
 
QT_BEGIN_NAMESPACE
 
 
class QQuick3DSceneManager;
class QQuick3DViewport;
struct QSSGRenderLayer;
 
class QQuick3DSceneRenderer
{
    using PickResultList = QVarLengthArray<QSSGRenderPickResult, 20>;
public:
    explicit QQuick3DSceneRenderer(const std::shared_ptr<QSSGRenderContextInterface> &rci);
    ~QQuick3DSceneRenderer();
 
    static QSSGRenderLayer::TonemapMode getTonemapMode(const QQuick3DSceneEnvironment &environment)
    {
        return environment.useBuiltinTonemapper() ? QSSGRenderLayer::TonemapMode(environment.tonemapMode())
                                                  : QSSGRenderLayer::TonemapMode::None;
    }
 
protected:
    QRhiTexture *renderToRhiTexture(QQuickWindow *qw);
    void beginFrame();
    void endFrame();
    void rhiPrepare(const QRect &viewport, qreal displayPixelRatio);
    void rhiRender();
    void synchronize(QQuick3DViewport *view3D, const QSize &size, float dpr);
    void invalidateFramebufferObject();
    QSize surfaceSize() const { return m_surfaceSize; }
    void releaseCachedResources();
 
    std::optional<QSSGRenderRay> getRayFromViewportPos(const QPointF &pos);
    QSSGRenderPickResult syncPick(const QSSGRenderRay &ray);
    QSSGRenderPickResult syncPickOne(const QSSGRenderRay &ray, QSSGRenderNode *node);
    PickResultList syncPickAll(const QSSGRenderRay &ray);
 
    void setGlobalPickingEnabled(bool isEnabled);
 
    QQuick3DRenderStats *renderStats();
 
private:
    void releaseAaDependentRhiResources();
    void updateLayerNode(QQuick3DViewport *view3D, const QList<QSSGRenderGraphObject *> &resourceLoaders);
    void addNodeToLayer(QSSGRenderNode *node);
    void removeNodeFromLayer(QSSGRenderNode *node);
    std::shared_ptr<QSSGRenderContextInterface> m_sgContext;
    QSSGRenderLayer *m_layer = nullptr;
    QPointer<QQuick3DWindowAttachment> winAttacment;
    QSize m_surfaceSize;
    SGFramebufferObjectNode *fboNode = nullptr;
    bool m_aaIsDirty = true;
 
    // RHI
    QRhiTexture *m_texture = nullptr;
    // the rt is set up to output into m_texture or m_ssaaTexture or m_msaaRenderBuffer(+resolve into m_texture)
    QRhiTextureRenderTarget *m_textureRenderTarget = nullptr;
    QRhiRenderPassDescriptor *m_textureRenderPassDescriptor = nullptr;
    // used by the draw quad that does m_ssaaTexture -> m_texture
    QRhiTextureRenderTarget *m_ssaaTextureToTextureRenderTarget = nullptr;
    QRhiRenderPassDescriptor *m_ssaaTextureToTextureRenderPassDescriptor = nullptr;
    QRhiRenderBuffer *m_msaaRenderBuffer = nullptr;
    QRhiTexture *m_ssaaTexture = nullptr;
    QRhiTexture *m_temporalAATexture = nullptr;
    QRhiTexture *m_prevTempAATexture = nullptr;
    QRhiTextureRenderTarget *m_temporalAARenderTarget = nullptr;
    QRhiRenderPassDescriptor *m_temporalAARenderPassDescriptor = nullptr;
    QRhiRenderBuffer *m_depthStencilBuffer = nullptr;
    bool m_textureNeedsFlip = true;
    QSSGRenderLayer::Background m_backgroundMode;
    QColor m_userBackgroundColor = Qt::black;
    QColor m_linearBackgroundColor = Qt::black;
    QColor m_tonemappedBackgroundColor = Qt::black;
    int m_samples = 1;
    QSSGRhiEffectSystem *m_effectSystem = nullptr;
 
    QPointer<QQuick3DRenderStats> m_renderStats;
 
    QSSGRenderNode *m_sceneRootNode = nullptr;
    QSSGRenderNode *m_importRootNode = nullptr;
 
    float m_ssaaMultiplier = 1.5f;
 
    bool m_prepared = false;
 
    int requestedFramesCount = 0;
    bool m_postProcessingStack = false;
    Q_QUICK3D_PROFILE_ID
 
    friend class SGFramebufferObjectNode;
    friend class QQuick3DSGRenderNode;
    friend class QQuick3DSGDirectRenderer;
    friend class QQuick3DViewport;
    friend struct ViewportTransformHelper;
};
 
namespace QQuick3DRenderLayerHelpers {
Q_QUICK3D_EXPORT void updateLayerNodeHelper(const QQuick3DViewport &view3D, QSSGRenderLayer &layerNode, bool &aaIsDirty, bool &temporalIsDirty, float &ssaaMultiplier);
}
 
class SGFramebufferObjectNode final : public QSGTextureProvider, public QSGSimpleTextureNode
{
    Q_OBJECT
 
public:
    SGFramebufferObjectNode();
    ~SGFramebufferObjectNode() override;
 
    void scheduleRender();
 
    QSGTexture *texture() const override;
 
    void preprocess() override;
 
public Q_SLOTS:
    void render();
 
    void handleScreenChange();
 
public:
    QQuickWindow *window;
    QQuick3DSceneRenderer *renderer;
    QQuick3DViewport *quickFbo;
 
    bool renderPending;
    bool invalidatePending;
 
    qreal devicePixelRatio;
};
 
class QQuick3DSGRenderNode final : public QSGRenderNode
{
public:
    ~QQuick3DSGRenderNode();
    void prepare() override;
    StateFlags changedStates() const override;
    void render(const RenderState *state) override;
    void releaseResources() override;
    RenderingFlags flags() const override;
public:
    QQuickWindow *window = nullptr;
    QQuick3DSceneRenderer *renderer = nullptr;
};
 
class QQuick3DSGDirectRenderer : public QObject
{
    Q_OBJECT
public:
    enum QQuick3DSGDirectRendererMode {
        Underlay,
        Overlay
    };
    QQuick3DSGDirectRenderer(QQuick3DSceneRenderer *renderer, QQuickWindow *window, QQuick3DSGDirectRendererMode mode = Underlay);
    ~QQuick3DSGDirectRenderer();
 
    QQuick3DSceneRenderer *renderer() { return m_renderer; }
    void setViewport(const QRectF &viewport);
 
    void requestRender();
    void setVisibility(bool visible);
 
private Q_SLOTS:
    void prepare();
    void render();
 
private:
    QQuick3DSceneRenderer *m_renderer = nullptr;
    QQuickWindow *m_window = nullptr;
    QQuick3DSGDirectRendererMode m_mode;
    QRectF m_viewport;
    bool m_isVisible = true;
    QRhiTexture *m_rhiTexture = nullptr;
    bool renderPending = false;
};
 
QT_END_NAMESPACE
 
#endif // QSSGSCENERENDERER_H