The fallback set the rasterizer's Z to a constant so nothing would clip, which
lost the clipping at the PSP's near plane too. Hardware depth clamp loses it
the same way, which the vertex shader can only make up for with a clip plane.
Give the rasterizer (z + w) / 65536 instead: 0 at the near plane, so it clips
there, and past w only beyond 65535 * w. And without clip distances, use the
fragment fallback instead of hardware depth clamp.
With --disable-gpu-features for all three on the Mac, the framedumps set now
differs from the full render by 15570 px instead of 184229 (WALL-E, Hokuto no
Ken, Frontier Gate, FF Zero). The full render doesn't change.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
