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sh2 drc: updates from mame for ym2612 sound

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This commit is contained in:
kub 2019-12-21 22:54:40 +01:00
parent 0e12269073
commit 9090dc0f22
3 changed files with 56 additions and 30 deletions
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14
pico/sound/ym2612_arm.S
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@ -30,7 +30,7 @@
.equiv EG_SH, 16 @ 16.16 fixed point (envelope generator timing)
.equiv EG_TIMER_OVERFLOW, (3*(1<<EG_SH)) @ envelope generator timer overflows every 3 samples (on real chip)
.equiv LFO_SH, 25 /* 7.25 fixed point (LFO calculations) */
.equiv LFO_SH, 24 /* 8.24 fixed point (LFO calculations) */
.equiv ENV_QUIET, (2*13*256/8)
@ -87,9 +87,13 @@
mov r2, r2, lsl r3
add r0, r0, r2, asr #4
cmp r0, #0 @ if (volume <= MIN_ATT_INDEX)
movle r3, #EG_DEC
strleb r3, [r5,#0x17] @ state
movle r0, #0
bgt 10f
ldr r2, [r5,#0x1c]
mov r0, #0
cmp r2, #0
movne r3, #EG_DEC
moveq r3, #EG_SUS
strb r3, [r5,#0x17] @ state
b 10f
2: @ EG_SUS
@ -141,7 +145,7 @@
beq 0f
and r3, r2, #0x3f
cmp r2, #0x40
rsbge r3, r3, #0x3f
eorlt r3, r3, #0x3f
bic r12,r12, #0xff000000 @ lfo_ampm &= 0xff
orr r12,r12, r3, lsl #1+24