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Extract out a cross roduct component.

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ed
2026-08-17 10:34:43 -04:00
parent e79c364b40
commit d4795cf9de
3 changed files with 116 additions and 9 deletions
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code/duffle/gte.atom.c
+12 -8
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@@ -30,6 +30,14 @@ FI_ Slice_MipsCode ac_gte_ld_ir123_v3s4(AtomBuilder_R ab, Reg_(V3_S4) v) MipsAto
gte_mv_to_data_r(v.z, C2_IR3),
})
FI_ Slice_MipsCode ac_gte_op_cross_v3s4(AtomBuilder_R ab, Reg_(V3_S4) a, Reg_(V3_S4) b) atom_dbg_skip MipsAtomComp_Proc_(ab, {
mac_gte_mv_to_cr_diag_v3s4(a), GteDelay_ /* RT diagonal: D1 = a.x, D2 = a.y, D3 = a.z */
mac_gte_ld_ir123_v3s4(b), GteDelay_ /* IR: second operand (b.xyz) */
gte_cmdw_cross, /* OP: MAC1/2/3 = a × b (S12.20) */
mac_gte_mv_from_mac123_v3s4(a), GteDelay_ /* Read MAC1/2/3 → a.xyz (overwrites source-A's load targets) */
mac_shift_aright_v3s4_self(a, 12), /* Right-shift MAC by 12 (S12.20 → S12.0 OuterProduct12) */
})
/* Words: 3; Stores the 3 transformed (V2_S2 screen) vertices to the F3.
* PIPELINE: post-RTPT (SXY0=v0.screen, SXY1=v1.screen, SXY2=v2.screen). */
FI_ Slice_MipsCode ac_gte_store_f3(AtomBuilder_R ab, U4 r_primitive_cursor) atom_dbg_skip MipsAtomComp_Proc_(ab, {
@@ -173,6 +181,9 @@ MipsAtomComp_Proc_(ab, {
gte_mv_from_data_r(fr_mac3, C2_MAC3),
})
FI_ Slice_MipsCode ac_gte_mv_from_mac123_v3s4(AtomBuilder_R ab, Reg_(V3_S4) v) MipsAtomComp_ProcMap_(ab, mac_gte_mv_from_data_r_mac123(v.x, v.y, v.z))
#pragma endregion MACs (Mips Atom Components)
#pragma region Atom Procs
@@ -348,18 +359,11 @@ atom_info(atom_bind(Binds_gte_cross_v3s4)) MipsAtom_Proc_(aa, {
mac_load_v3s4(r.a, r.src_a, 0), LdSlot_
mac_load_v3s4(r.b, r.src_b, 0), LdSlot_
mac_gte_mv_to_cr_diag_v3s4(r.a), GteDelay_ /* RT diagonal: D1 = a.x, D2 = a.y, D3 = a.z. */
mac_gte_ld_ir123_v3s4(r.b), GteDelay_ /* IR: second operand. */
gte_cmdw_cross, /* MAC1/2/3 = a × b */
mac_gte_mv_from_data_r_mac123(r.a.x, r.a.y, r.a.z), GteDelay_ //nop,
mac_shift_aright_v3s4_self(r.a, 12),
mac_gte_op_cross_v3s4(r.a, r.b), /* RT diagonal + IR + OP + MAC read + shift (one component call). */
mac_store_v3s4(r.a, r.out, 0),
mac_yield()
})
#pragma endregion Atom Procs
#pragma region Baked Atoms