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ed
2026-08-13 17:42:55 -04:00
parent 5ebaa6e083
commit 4688566767
5 changed files with 141 additions and 11 deletions
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code/hello_camera/hello_camera.atom.c
+10 -9
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@@ -123,6 +123,7 @@ enum {
/* Wave-context GPR carrier for the resolve_look_at bundle: the scratch base.
* Set by atom 0 (popped from tape), read by atoms 1-6 (used as pointer base). */
R_ResolveScratch = R_T4 atom_reg atom_type(U4*),
#define R_ResolveScratch_Code R_T4_Code
};
typedef Struct_(Binds_ResolveLookAt) {
MT3_S2S4* look_at;
@@ -561,15 +562,6 @@ internal MipsAtom* resolve_look_at__matrix_vector_proc(AtomArena_R aa
add_si(r_peye, r_scratch, O_(ResolveLookAtScratch,eye)),
nop,
/* Load pos = -eye from scratch. */
load_word(r_tmp0, r_peye, O_(P3_S4,x)),
load_word(r_tmp1, r_peye, O_(P3_S4,y)),
load_word(r_tmp2, r_peye, O_(P3_S4,z)),
nop,
sub_u(r_tmp0, R_0, r_tmp0), /* pos.x = -eye.x */
sub_u(r_tmp1, R_0, r_tmp1),
sub_u(r_tmp2, R_0, r_tmp2),
/* === Load RT matrix from look_at into C2[0..4] via ctc2 ===
* Exact same sequence as set_gte_mt3s2s4 / C11's ApplyMatrixLV. */
load_word(r_tmp0, r_look_at, 0), nop,
@@ -584,6 +576,15 @@ internal MipsAtom* resolve_look_at__matrix_vector_proc(AtomArena_R aa
gte_mv_to_ctrl_r(r_tmp0, gte_cr_RT22),
nop2, /* CTC2 retirement (2 slots × 5 ctc2s) */
/* Load pos = -eye after the matrix load releases r_tmp0. */
load_word(r_tmp0, r_peye, O_(P3_S4,x)),
load_word(r_tmp1, r_peye, O_(P3_S4,y)),
load_word(r_tmp2, r_peye, O_(P3_S4,z)),
nop,
sub_u(r_tmp0, R_0, r_tmp0), /* pos.x = -eye.x */
sub_u(r_tmp1, R_0, r_tmp1),
sub_u(r_tmp2, R_0, r_tmp2),
/* === mtc2 pos (as S16) to IR1/2/3 ===
* The GTE takes low 16 bits. pos fits in S16. For negative pos, the
* 32-bit sign-extended value's low 16 bits = correct S16. */