- Fixes#22104
NFS Most Wanted's music visualizer is a 32x16 spline of lines at 8x8
tessellation: 144768 indices, which software transform expands to far more
than VERTEX_BUFFER_MAX vertices, so SubmitPrim splits it and flushes between
the parts. The curve's indices sat at the start of decIndex_, where each
flush writes its generated and expanded indices, so the first flush
overwrote most of the later parts and about half the visualizer was lost.
Tessellate the indices into the upper half instead, and don't use the
predecoded output for a curve that will be split, as the flushes decode
over it.
The game also sends an empty PRIM with VADDR 0 every frame, which the
hardware backends logged as a bad vertex address. Skip zero-count PRIMs
before the address check, as the software renderer does.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
