ogc: reset cull mode, Z-buffering and alpha compare when drawing cursor #84
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OpenGX might have set the GPU to perform Z-buffering, triangle culling and alpha compare in such a way that our mouse cursor will not be drawn. For that reason, reset them to ensure that our cursor will always be drawn.
Extra care must be put to restore these registers to the same state in which SDL had set them before, in order not to break 2D applications.