void QGLEngineShaderManager::setSrcPixelType(Qt::BrushStyle style)
{
    if (srcPixelType == PixelSrcType(style))
        return;

    srcPixelType = style;
    shaderProgNeedsChanging = true; //###
}
void QOpenGLEngineShaderManager::setSrcPixelType(Qt::BrushStyle style)
{
    Q_ASSERT(style != Qt::NoBrush);
    if (srcPixelType == PixelSrcType(style))
        return;

    srcPixelType = style;
    shaderProgNeedsChanging = true; //###
}