Sergey Sharybin
726bc3a46b
Was happening during rendering, causing visual artifacts when doing CPU+GPU rendering, and giving different in-progress results on different devices. The root of the issue comes to the fact that math used in the approximate shadow catcher calculation might have resulted in negative alpha channel, and negative values for display are handled differently on CPU and GPU. Such difference in handling is caused by an approximate conversion used on the CPU for the performance reasons. This change makes it so no negative alpha is generated by the approximate shadow catcher. Not sure if we need some explicit clamping somewhere to deal with possible negative values coming from somewhere else. The shadow catcher cornell box tests are to be updated for the new code, but the new result seems to be more accurate. Differential Revision: https://developer.blender.org/D13354
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