shadow_material.h

#pragma once
 
#include <QSGMaterial>
 
namespace qml_material::sg
{
 
class ShadowMaterial : public QSGMaterial {
public:
    ShadowMaterial();
    ~ShadowMaterial() = default;
 
    QSGMaterialShader* createShader(QSGRendererInterface::RenderMode) const override;
    QSGMaterialType*   type() const override;
    int                compare(const QSGMaterial* other) const override;
 
    void init_fadeoff_texture(QQuickWindow* win);
    auto strength_texture() -> QSGTexture*;
 
private:
    // Not owned — the per-window texture cache owns the storage.
    QSGTexture* m_fadeoff_texture { nullptr };
};
 
class ShadowShader : public QSGMaterialShader {
public:
    ShadowShader();
 
    bool updateUniformData(QSGMaterialShader::RenderState& state, QSGMaterial* newMaterial,
                           QSGMaterial* oldMaterial) override;
 
    void updateSampledImage(RenderState&, int binding, QSGTexture** texture,
                            QSGMaterial* newMaterial, QSGMaterial*) override;
};
 
} // namespace qml_material::sg