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diff --git a/src/quick/items/qquickshadereffect_p_p.h b/src/quick/items/qquickshadereffect_p_p.h
new file mode 100644
index 0000000000..e7224e50a9
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+++ b/src/quick/items/qquickshadereffect_p_p.h
@@ -0,0 +1,126 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QQUICKSHADEREFFECT_P_P_H
+#define QQUICKSHADEREFFECT_P_P_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 <private/qtquickglobal_p.h>
+
+QT_REQUIRE_CONFIG(quick_shadereffect);
+
+#include <private/qquickshadereffect_p.h>
+#include <private/qquickitem_p.h>
+#include <private/qquickshadereffectmesh_p.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace QtPrivate {
+class EffectSlotMapper;
+}
+
+class QQuickShaderEffectPrivate : public QQuickItemPrivate
+{
+    Q_DECLARE_PUBLIC(QQuickShaderEffect)
+
+public:
+    QQuickShaderEffectPrivate();
+    ~QQuickShaderEffectPrivate();
+
+    void updatePolish() override;
+
+    QUrl fragmentShader() const { return m_fragShader; }
+    void setFragmentShader(const QUrl &fileUrl);
+
+    QUrl vertexShader() const { return m_vertShader; }
+    void setVertexShader(const QUrl &fileUrl);
+
+    bool blending() const { return m_blending; }
+    void setBlending(bool enable);
+
+    QVariant mesh() const;
+    void setMesh(const QVariant &mesh);
+
+    QQuickShaderEffect::CullMode cullMode() const { return m_cullMode; }
+    void setCullMode(QQuickShaderEffect::CullMode face);
+
+    QString log() const;
+    QQuickShaderEffect::Status status() const;
+
+    bool supportsAtlasTextures() const { return m_supportsAtlasTextures; }
+    void setSupportsAtlasTextures(bool supports);
+
+    QString parseLog();
+
+    void handleEvent(QEvent *);
+    void handleGeometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry);
+    QSGNode *handleUpdatePaintNode(QSGNode *, QQuickItem::UpdatePaintNodeData *);
+    void handleComponentComplete();
+    void handleItemChange(QQuickItem::ItemChange change, const QQuickItem::ItemChangeData &value);
+    void maybeUpdateShaders();
+    bool updateUniformValue(const QByteArray &name, const QVariant &value,
+                            QSGShaderEffectNode *node);
+
+    void propertyChanged(int mappedId);
+    void sourceDestroyed(QObject *object);
+    void markGeometryDirtyAndUpdate();
+    void markGeometryDirtyAndUpdateIfSupportsAtlas();
+    void shaderCodePrepared(bool ok, QSGGuiThreadShaderEffectManager::ShaderInfo::Type typeHint,
+                            const QUrl &loadUrl, QSGGuiThreadShaderEffectManager::ShaderInfo *result);
+
+private:
+    QSGGuiThreadShaderEffectManager *shaderEffectManager() const;
+
+    enum Shader {
+        Vertex,
+        Fragment,
+
+        NShader
+    };
+    bool updateShader(Shader shaderType, const QUrl &fileUrl);
+    void updateShaderVars(Shader shaderType);
+    void disconnectSignals(Shader shaderType);
+    void clearMappers(Shader shaderType);
+    std::optional<int> findMappedShaderVariableId(const QByteArray &name) const;
+    std::optional<int> findMappedShaderVariableId(const QByteArray &name, Shader shaderType) const;
+    bool sourceIsUnique(QQuickItem *source, Shader typeToSkip, int indexToSkip) const;
+
+    bool inDestructor = false;
+    const QMetaObject *m_itemMetaObject = nullptr;
+    QSize m_meshResolution;
+    QQuickShaderEffectMesh *m_mesh;
+    QMetaObject::Connection m_meshConnection;
+    QQuickGridMesh m_defaultMesh;
+    QQuickShaderEffect::CullMode m_cullMode;
+    bool m_blending;
+    bool m_supportsAtlasTextures;
+    mutable QSGGuiThreadShaderEffectManager *m_mgr;
+    QUrl m_fragShader;
+    bool m_fragNeedsUpdate;
+    QUrl m_vertShader;
+    bool m_vertNeedsUpdate;
+
+    QSGShaderEffectNode::ShaderData m_shaders[NShader];
+    QSGShaderEffectNode::DirtyShaderFlags m_dirty;
+    QSet<int> m_dirtyConstants[NShader];
+    QSet<int> m_dirtyTextures[NShader];
+    QSGGuiThreadShaderEffectManager::ShaderInfo *m_inProgress[NShader];
+
+    QVector<QtPrivate::EffectSlotMapper *> m_mappers[NShader];
+
+    QHash<QQuickItem *, QMetaObject::Connection> m_destroyedConnections;
+};
+
+QT_END_NAMESPACE
+
+#endif // QQUICKSHADEREFFECT_P_P_H