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remove outdated comments.

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ed
2026-08-16 12:07:09 -04:00
parent 581b00b960
commit 18b1d5a04b
4 changed files with 13 additions and 73 deletions
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code/hello_camera/hello_camera.atom.c
+7 -25
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@@ -140,9 +140,9 @@ typedef Struct_(ResolveLookAtScratch) {
};
typedef Struct_(Binds_ResolveLookAtSub) {
P3_S4* target; /* U4 (C-side P3_S4* — read by atom 0 directly; NOT a scratchpad address) */
P3_S4* eye; /* U4 (C-side P3_S4* — read by atom 0 directly; staged into scratchpad by atom 0) */
V3_S4* up_in; /* U4 (C-side V3_S4* — read by atom 0 directly; staged into scratchpad by atom 0) */
P3_S4* target;
P3_S4* eye;
V3_S4* up_in;
ResolveLookAtScratch* scratchpad;
};
typedef Struct_(RegUse_resolve_look_at_input_and_sub) {
@@ -150,25 +150,7 @@ typedef Struct_(RegUse_resolve_look_at_input_and_sub) {
Reg target; Reg eye; Reg up_in;
Reg t0; Reg t1; Reg t2; Reg t3; Reg t4;
};
/* Atom 0 in the bundle: input_and_sub. Stages C-side inputs into the scratchpad and computes fwd = target - eye.
* Staging work:
* * Stage eye.x/y/z → scratch (for atom 6's translation column)
* * Stage up_in.x/y/z → scratch (for atom 2's outer-product operand)
* * Compute fwd = target - eye, store fwd.x/y/z → scratch+0/+4/+8 (for atom 1)
* GPR codes (assigned by resolve_look_at_init):
* r_target_ptr : R_T0
* r_eye_ptr : R_T1
* r_up_in_ptr : R_T2
* r_scratch : R_T4 (R_ResolveScratch; wave-context carrier)
* r_tmp0 : R_T3 (stage eye/up_in + load eye.y)
* r_tmp1 : R_T5 (stage eye/up_in + load eye.z)
* r_tmp2 : R_T6 (stage eye/up_in + load target.x)
* r_tmp3 : R_T7 (stage eye/up_in + load target.y)
* R_AT : hardcoded (load eye.y / eye.z / target.z)
* R_V0 : hardcoded (load eye.z / target.z)
* Pool cost: 8 GPRs + R_T4 (carrier) + R_AT + R_V0 (hardcoded) = 11 GPRs.
*/
// internal MipsAtom* resolve_look_at_input_and_sub(AtomArena_R aa, RegUse_resolve_look_at_input_and_sub r)
/* Atom 0 in the bundle: input_and_sub. Stages C-side inputs into the scratchpad and computes fwd = target - eye. */
internal MipsAtom* AtomBundleEntry_(resolve_look_at,input_and_sub)(AtomArena_R aa, RegUse_resolve_look_at_input_and_sub r)
atom_info(atom_bind(Binds_ResolveLookAtSub)) MipsAtom_Proc_(aa, {
load_word(r.target, R_TapePtr, O_(Binds_ResolveLookAtSub,target)),
@@ -238,14 +220,14 @@ internal MipsAtom* resolve_look_at_cross_uz_up_into_right(AtomArena_R aa,
gte_mv_to_ctrl_r(r.c, gte_cr_RT22), /* $4 = r_c = a.z. RT22=a.z.low, RT33=a.z.high. */
/* Load uz into the RT diagonal. */
gte_mv_to_ctrl_r(r.a, gte_cr_RT11), /* D1 = RT11 = uz.x (low 16 of $0, sign-extended by OP). */
GteDelay_ nop2, /* CTC2 retirement (CPU→COP2 2-slot delay) */
gte_mv_to_ctrl_r(r.a, gte_cr_RT11), /* D1 = RT11 = uz.x. */
GteDelay_ nop2, /* CTC2 retirement */
/* Load up_in into IR (the second operand for OP). */
gte_mv_to_data_r(r.d, C2_IR1), /* IR1 = up_in.x */
gte_mv_to_data_r(R_AT, C2_IR2), /* IR2 = up_in.y */
gte_mv_to_data_r(r.t0, C2_IR3), /* IR3 = up_in.z */
GteDelay_ nop2, /* MTC2 retirement (CPU→COP2 2-slot delay) */
GteDelay_ nop2, /* MTC2 retirement */
gte_cmdw_cross, /* OP: MAC1/2/3 = uz × up_in
* MAC1 = IR3*D2 - IR2*D3 = up_in.z*uz.y.high - up_in.y*uz.z.high
code/hello_camera/hello_camera.c
+2 -16
View File
@@ -263,11 +263,7 @@ internal void compile_resolve_look_at(void) {
});
regfile_reset_to_mask(& rf, pin_mask);
/* === ATOM 6a.5: set_gte_mt3s2s4 (BAKED — ctc2 RT matrix) ===
* This is a BAKED atom from gte.atom.c. Its body hardcodes R_T3 as
* the matrix pointer (popped from tape). It does NOT need GPR
* assignment from us — it has its own internal GPR usage.
* We just take its address. */
/* === ATOM 6a.5: set_gte_mt3s2s4 (BAKED — ctc2 RT matrix) === */
smem.resolve_look_at_bundle[7] = (MipsAtom*) & set_gte_mt3s2s4;
/* === ATOM 6b: matrix_vector (RT * (-eye) >> 12) === */
@@ -292,17 +288,7 @@ internal void compile_resolve_look_at(void) {
#undef ralloc
}
/* Emit the resolve_look_at bundle into the tape. Called once per frame from update().
* The 7 chain atoms are pre-built at init time (resolve_look_at_init) and referenced by address via smem.resolve_look_at_atom_addrs[].
* Per-frame work: 7 tb_emit (atom pointer emissions) + 5 tb_data (C-side pointers for atom 0 + look_at for atom 6).
*
* Binds_ contract (the field-name labels are for human readability):
* Atom 0 input_and_sub target(4) eye(4) up_in(4) scratch_base(4) = 4 words
* Atoms 1-5 (no tape data — atom uses r_scratch + offset internally)
* Atom 6 populate_and_translate look_at(4) = 1 word
* ----
* 5 tb_data words total per frame.
*/
/* Emit the resolve_look_at bundle into the tape. Called once per frame from update(). */
I_ void resolve_look_at(TapeBuilder_R tb
, MT3_S2S4* look_at
, P3_S4* eye