86Box with PowerVR PCX2 emulation 0.2

Changes since 0.1.1:

• Triangles whose edge lies a fraction of a pixel outside the screen are now dropped,
  as the real card does. Found with Shadows of the Empire 1.1 at 320x240 and
  320x200, where stray triangles appeared in the menus.

Since 0.1 the emulation has been compared against a real Matrox m3D on about 30 titles
and demos, including Flight Unlimited, World Cup 98, Forsaken, GLQuake, the Tomb Raider
DOS demo and Moto Racer at five resolutions; every frame matches to within a handful of
pixels. The full list:
https://github.com/z2k-retro/powervr-pcx2-tools/blob/main/docs/using-86box.md

Notes:

• Shadows of the Empire - LucasArts' 1.1 update fixes transparency glitches on PowerVR cards. Fog is missing on
  the PCX2 even then; LucasArts' own notes say so.
• With a Matrox Millennium as the 2D card, 320-wide screen modes look doubled side by
  side. That is 86Box's Millennium display; the S3 Trio64 shows them correctly.

Hardware, testing and direction by Z2k Retro. Written with substantial help from Claude,
Anthropic's AI model; every result was checked on the real card.