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ed
2026-08-12 20:30:26 -04:00
parent 77f19321cd
commit 6b60cef2e8
2 changed files with 104 additions and 24 deletions
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code/hello_camera/hello_camera.c
+25 -4
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@@ -85,7 +85,7 @@ typedef Struct_(SMemory) {
U4_V scratchpad; // d-cache
U4 resolve_look_at_mem[ResolveLookAtArena_Words];
MipsAtom* resolve_look_at_atom_addrs[7];
MipsAtom* resolve_look_at_atom_addrs[9];
};
global SMemory smem;
extern SMemory smem;
@@ -238,11 +238,26 @@ internal void resolve_look_at_init(void) {
/* Atom 6: resolve_look_at__populate_and_translate — write look_at->m[][] from ux/uy/uz (computed from r_scratch+offset internally),
then compute translation column t[] = R * (-eye). GPR pool: r_look_at + r_scratch + 4 ptr regs + 3 tmp regs = 9. */
smem.resolve_look_at_atom_addrs[6] = resolve_look_at__populate_and_translate_proc(& ab,
smem.resolve_look_at_atom_addrs[6] = resolve_look_at__populate_proc(& ab,
R_T0, /* r_look_at (popped from tape; MT3_S2S4*) */
R_ResolveScratch, /* r_scratch (wave-context carrier) */
R_T1, R_T3, R_T5, R_T7, /* r_pux, r_puy, r_puz, r_peye */
R_T1, R_T3, R_T5, /* r_pux, r_puy, r_puz (no r_peye — 6a doesn't read eye) */
R_T2, R_T6, R_V0); /* r_tmp0, r_tmp1, r_tmp2 */
ab.start = ab.start + ab.used;
/* Atom 6b: resolve_look_at__matrix_vector - GTE MVMVA off = R * (-eye). Stores off to scratch+96. */
smem.resolve_look_at_atom_addrs[7] = resolve_look_at__matrix_vector_proc(& ab,
R_ResolveScratch, /* r_scratch (wave-context carrier) */
R_T1, /* r_peye (reused as off destination) */
R_T0, R_T2, R_T3); /* r_tmp0, r_tmp1, r_tmp2 */
ab.start = ab.start + ab.used;
/* Atom 6c: resolve_look_at__trans_matrix - copy scratch+96 (off) → look_at->t[]. */
smem.resolve_look_at_atom_addrs[8] = resolve_look_at__trans_matrix_proc(& ab,
R_T0, /* r_look_at (popped from tape; MT3_S2S4*) */
R_ResolveScratch, /* r_scratch (wave-context carrier) */
R_T1, /* r_off_ptr = &scratch.eye */
R_T2); /* r_tmp0 (transfer reg) */
/* Sanity check: arena didn't overflow. */
assert(ab.used <= ResolveLookAtArena_Words);
@@ -283,10 +298,16 @@ I_ void resolve_look_at(
tb_emit(tb, smem.resolve_look_at_atom_addrs[4]); { }
tb_emit(tb, smem.resolve_look_at_atom_addrs[5]); { }
// /* Atom 6: populate_and_translate — only output pointer is the matrix destination. */
// /* Atom 6a: populate — pop look_at* for the matrix destination. */
// tb_emit(tb, smem.resolve_look_at_atom_addrs[6]); {
// tb_data(tb, u4_(look_at)); /* Binds_ResolveLookAtPopAndTrans.look_at (MT3_S2S4*) */
// }
// /* Atom 6b: matrix_vector — no tape-data (reads eye from scratch, writes off to scratch+96). */
// tb_emit(tb, smem.resolve_look_at_atom_addrs[7]); { }
// /* Atom 6c: trans_matrix — pop look_at* for the matrix destination. */
// tb_emit(tb, smem.resolve_look_at_atom_addrs[8]); {
// tb_data(tb, u4_(look_at)); /* Binds_ResolveLookAtPopAndTrans.look_at (MT3_S2S4*) */
// }
}
FI_ void camera_look_at_c11(Camera* c, P3_S4* target, V3_S4* up_in) { resolve_look_at_c11(& c->look_at, & c->pos, target, up_in); }