Hardware transform does the matrices on the GPU, software transform on the CPU,
and their depths differ by a few ulps on 40-90% of pixels. That's enough to
fail an equal-depth GEQUAL test where a frame mixes the two, which happens to
draws that cross the near plane on GPUs without cull distances: DBZ Tenkaichi
Tag Team's outlines, Naruto Ultimate Ninja Impact's grass over the ground.
Both paths end in the same vertex shader code, so snapping there makes them
agree: screen Z to 1/8 (whole units break a decal in Star Wars Lethal
Alliance) and W to 16 significant bits. W is left alone without integer ops.
On the framedump set with Mac Vulkan: DBZ 3198 -> 77 px off the PSP, Naruto
3243 -> 906, Monster Hunter 792 -> 21, FF Type-0 559 -> 0.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
