bone_sse: replace matMul/ftol/vec3SqMag with pure Zig, fix visual artifacts

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Root cause of billboard visual artifacts: callVec3SqMag used inline asm
to call game's x87 vec3SqMag (0x4549F0) with fstps to capture ST0.
With SSE2 codegen, the x87/SSE state interaction caused corrupted float
values in billboard bone matrices (mat[0][2] wildly wrong).

Replaced with pure Zig: x*x + y*y + z*z — no x87, no inline asm.

Also replaced:
- matMul (0x74A7C0): pure Zig f64 scalar matmul, no alignment needs
- callFtol (0x40A2B0): f64 intermediate + @intFromFloat (cvttsd2si)

Architecture: bone_sse.zig is REF code compiled with SSE2, called as
cdecl from thiscall wrapper in transform44.zig (cross-object to prevent
LLVM inlining AND ESP alignment into thiscall frame).

A/B: other hooks gated behind AB_OTHER_HOOKS=false for isolated testing.

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This commit is contained in:

MarcelineVQ

2026-03-16 10:10:02 -07:00

parent 252853dd8f

commit 008db88403

3 changed files with 1445 additions and 787 deletions

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src/transform44/bone_sse.zig

+1337 -775

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