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Before flushing the journal there is now a separate iteration that will try to determine if the matrix of the clip stack and the matrix of the rectangle in each entry are on the same plane. If they are it can completely avoid the clip stack and instead manually modify the vertex and texture coordinates to implement the clip. The has the advantage that it won't break up batching if a single clipped rectangle is used in a scene. The software clip is only used if there is no user program and no texture matrices. There is a threshold to the size of the batch where it is assumed that it is worth the cost to break up a batch and program the GPU to do the clipping. Currently this is set to 8 although this figure is plucked out of thin air. To check whether the two matrices are on the same plane it tries to determine if one of the matrices is just a simple translation of the other. In the process of this it also works out what the translation would be. These values can be used to translate the clip rectangle into the coordinate space of the rectangle to be logged. Then we can do the clip directly in the rectangle's coordinate space. |
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