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remove mask from mips and gte instruction encoders. missing math changes.

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ed
2026-08-13 23:39:35 -04:00
parent 9a6eca6047
commit d88e0d0487
3 changed files with 31 additions and 26 deletions
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code/duffle/gte.h
+13 -14
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@@ -177,18 +177,17 @@ enum {
* Mirrors the OPCODE_SHIFT / RS_SHIFT convention used in mips.h.
*/
gte_shift_sf = 19, gte_width_sf = 1, gte_mask_sf = 0x1,
gte_shift_mx = 17, gte_width_mx = 2, gte_mask_mx = 0x3,
gte_shift_v = 15, gte_width_v = 2, gte_mask_v = 0x3,
gte_shift_cv = 13, gte_width_cv = 2, gte_mask_cv = 0x3,
gte_shift_lm = 10, gte_width_lm = 1, gte_mask_lm = 0x1,
gte_shift_cmd = 0, gte_width_cmd = 6, gte_mask_cmd = 0x3F,
gte_shift_sf = 19, gte_width_sf = 1,
gte_shift_mx = 17, gte_width_mx = 2,
gte_shift_v = 15, gte_width_v = 2,
gte_shift_cv = 13, gte_width_cv = 2,
gte_shift_lm = 10, gte_width_lm = 1,
gte_shift_cmd = 0, gte_width_cmd = 6,
/* Fake command number (bits 24-20) — IGNORED by the GTE hardware per PSX-SPX `geometrytransformationenginegte.md` line 48.
* libgte's compiler emits non-zero values in this field as a disassembly signature. */
gte_shift_fake_cmd = 20,
gte_width_fake_cmd = 5,
gte_mask_fake_cmd = 0x1F,
};
/* --- GTE Control Register Aliases (Pitfall 1) ---
@@ -351,13 +350,13 @@ enum { _C2_TX_SUBS_ = 0
#define gte_cmd_base (enc_op(op_cop2) | (1 << 25))
/* Per-field encoders. Each one does (value & mask) << shift on its own. */
#define enc_gte_sf(sf) (((sf) & gte_mask_sf ) << gte_shift_sf )
#define enc_gte_mx(mx) (((mx) & gte_mask_mx ) << gte_shift_mx )
#define enc_gte_v(v) (((v) & gte_mask_v ) << gte_shift_v )
#define enc_gte_cv(cv) (((cv) & gte_mask_cv ) << gte_shift_cv )
#define enc_gte_lm(lm) (((lm) & gte_mask_lm ) << gte_shift_lm )
#define enc_gte_cmd(cmd) (((cmd) & gte_mask_cmd ) << gte_shift_cmd )
#define enc_gte_fake_cmd(x) (((x) & gte_mask_fake_cmd) << gte_shift_fake_cmd)
#define enc_gte_sf(sf) ((sf) << gte_shift_sf )
#define enc_gte_mx(mx) ((mx) << gte_shift_mx )
#define enc_gte_v(v) ((v) << gte_shift_v )
#define enc_gte_cv(cv) ((cv) << gte_shift_cv )
#define enc_gte_lm(lm) ((lm) << gte_shift_lm )
#define enc_gte_cmd(cmd) ((cmd) << gte_shift_cmd )
#define enc_gte_fake_cmd(x) ((x) << gte_shift_fake_cmd)
/* Composite: all six GTE fields + the COP2/CO base. */
#define enc_gte_cmdw(sf, mx, v, cv, lm, cmd) ( \