sega/model2: draw polygons front to back, use fill buffer #14452
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The real hardware has two 32Kx8 RAM chips described in the Model 2B manual as "fill memory"; these effectively function as a pair of 1-bit depth buffers, one for each framebuffer.
Performance is improved over back-to-front rendering, particularly in more intensive scenes, since pixels that would be drawn where other pixels have already been drawn can be discarded early before texture mapping is performed.