Software renderer clips/culls incorrectly

[unknownbrackets]

See #9620. This is evident in the first-person modes of Persona 1 - various parts of drawing are culled.

Disabling the outside_range_flag culling doesn't fix it, but disabling the clipping in ProcessTriangle does (but also adds other artifacts, maybe things should be clipped or maybe things are wrapping - not clear.) This suggests it's a clipping problem of some sort.

-[Unknown]

[unknownbrackets]

Some affected games:

• ATV Offroad Fury Pro (ground behind bike)
• Gods Eater Burst (in corridor near room)
• Persona 1 (first-person modes)
• Kingdom Hearts: Birth by Sleep (ground)
• Sword Art Online (I think; when passing by buildings)
• Ys Seven (i.e. lava)
• 3rd Birthday (somewhat rarely)
• Wipeout Pure (track behind car)

-[Unknown]

[unknownbrackets]

In Persona 1, things look better if BOTH outside_range_flag is skipped, AND the complete cull on mask & CLIP_NEG_Z_BIT is skipped.

Dropped coords are similar to (7187.356445, 4103.426758, 65535) and (7187.356445, 7186.999023, 65535), which apparently should be clipped and drawn.

During such draws:

• Clipping flag (which almost seems to control depth clamp only?) is enabled
• Cullface is enabled (cull = back)
• Drawn in transform mode (u8 tc / float norm / s16 pos)
• Region and scissor are set to standard values
• Min/max Z: 0x1000 - 0xffff
• Viewport is fairly standard, except depth which is 34815 +/- -30719.5
• Offset is standard
• Primitive is triangle strip with four verts (so both triangles discarded if the vert is marked invalid)

-[Unknown]