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Viewing changes to src/shadervideomaterial.h

Use static shader object, as Qt caches the pointer to it
Using QAbstractVideoSurface::stop() obsoletes the check for the CameraControl pointer on every frame.

Approved by PS Jenkins bot.

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Lines of Context:
src/shadervideomaterial.h
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private:
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    QVideoSurfaceFormat m_format;
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    CameraControl *m_camControl;
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    mutable ShaderVideoShader *m_videoShader;
 
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    static ShaderVideoShader *m_videoShader; // the shader is cached in the Qt scene graph
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    GLfloat m_textureMatrix[16];
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    GLfloat m_flippedTextureMatrix[16];
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};