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WIP: preparing for major changes to atoms to fullfill needs of resolve_look_at and atom ported normalize_v3s4.

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ed
2026-08-09 18:49:59 -04:00
parent 69f2c0d036
commit e42c75a26a
14 changed files with 625 additions and 97 deletions
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code/hello_camera/hello_camera.atom.c
+9 -3
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@@ -383,8 +383,14 @@ internal MipsAtom_(resolve_look_at) atom_info(atom_bind(Binds_ResolveLookAt)) {
mac_load_v3s4(R_Eye_x, R_Eye_y, R_Eye_z, R_CamEye, 0),
mac_sub_v3s4( R_LkAt_Fwdx, R_LkAt_Fwdy, R_LkAt_Fwdz,
R_Eye_x, R_Eye_y, R_Eye_z),
// ac_normalize_v3s4(9 args): in-place normalize direction → unit vector.
// Reg-aliasing across the 4 stages: R_T7 = r_sq_y → r_lzcr, R_T8 = r_sq_z → r_shift,
// R_V0 = r_recip_est (always), R_V1 = r_tmp. r_sx/r_sy/r_sz = R_LkAt_Fwdx/y/z (in-place).
// mac_normalize_v3s4(R_LkAt_Fwdx, R_LkAt_Fwdy, R_LkAt_Fwdz,
// R_T7, R_T8,
// R_V0,
// R_T7, R_T8, R_V1),
mac_yield(),
};
@@ -438,7 +444,7 @@ MipsAtom_(cube_g4_face) atom_info(atom_phase(cube_g4),
branch_le_zero(R_T0, atom_offset(cull, cube_g4_face_exit)),
/* BD-slot: write the prim tag (R_0=0; overwrites the legacy tag word in the prim_buffer).
* If branch IS taken (face culled), the body is skipped and this 0-tag is stranded —
* harmless because the OT entry that points to this prim is created later, only on the body path. */
* harmless because the OT entry that points to this prim is created later. */
store_word(R_0, R_PrimCursor, O_(Poly_G4, tag)),
shift_lleft(R_AT, R_T3, v3s2_byteoff), add_u(R_AT, R_AT, R_VertBase),
load_word(R_V0, R_AT, O_(V3_S2, x)), load_word(R_V1, R_AT, O_(V3_S2, z)),
code/hello_camera/hello_camera.c
+33 -5
View File
@@ -172,12 +172,12 @@ void update(PrimitiveArena* pa, U4* ordering_buf)
S4 flag; //????
// Camera Look at
if (1)
if (0)
{
camera_look_at_c11(& smem.cam, & smem.cube.pos, & v3s4(0, -fp_one, 0));
}
// Camera look at (Tape)
if (0)
if (1)
{
MT3_S2S4* look_at = & smem.cam.look_at;
P3_S4* eye = & smem.cam.pos;
@@ -188,8 +188,36 @@ void update(PrimitiveArena* pa, U4* ordering_buf)
V3_S4 pos, off;
tb.used = 0; tb_scope_run(& tb) {
tb_emit_(resolve_look_at);
// tb_data_();
// tb_emit_bundle(resolve_look_at);
{
tb_emit_(resolve_look_at); {
tb_data_(look_at, & smem.cam.look_at);
tb_data_(eye, & smem.cam.pos);
tb_data_(target, & smem.cube.pos);
tb_data_(up_in, up_in);
// tb_emit(a_normalize_v3s4(/*Todo: resolve dependent register allocation*/));
// tb_data_(fwd_out);
}
#if 0
{
tb_emit_(resolve_look_at__resolve_right); {
//...
tb_emit_(a_normalize_v3s4(...));
tb_data_(right_out);
}
tb_emit(resolve_look_at__resolve_up); {
//...
tb_emit_(ac_normalize_v3s4(...));
tb_data_(up_out);
}
tb_emit(world_to_cam_expand_mt3_s2s4(...)); {
tb_data(look_at, & smem.cam.look_at);
}
tb_emit_(resolve_look_at__final); {
}
}
#endif
}
}
// forward = target[0]; sub_v3s4(& forward, eye[0]); // RGA(Lengyel): Affine point - point = zero-weight direction.
@@ -205,7 +233,7 @@ void update(PrimitiveArena* pa, U4* ordering_buf)
pos = eye[0]; mul_v3s4(& pos, v3s4(-1,-1,-1)); // RGA(Lengyel): -eye in world coordinates (spatial bulk only; implicit weight is dropped).
// RGA(Lengyel): R * (-eye) is the full matrix translation column.
// RGA(Lengyel): R * (-eye) -- full matrix translation column.
// Motor translator would store half this displacement in m.xyz; GTE consumes full column.
mul_m3s2_v3s4(look_at, & pos, & off);
trans_m3s2( look_at, & off);