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sound, fix ym2612 ladder effect, add option

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This commit is contained in:
kub 2021-11-19 21:01:50 +01:00
parent b55e4e1b2f
commit 23cd73bc8f
9 changed files with 46 additions and 22 deletions
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11
pico/sound/ym2612_arm.S
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@ -677,7 +677,7 @@
@ lr=context, r12=pack (stereo, ssg_enabled, disabled, lfo_enabled | pan_r, pan_l, ams[2] | AMmasks[4] | FB[4] | lfo_ampm[16])
@ r0-r2=scratch, r3=sin_tab/scratch, r4=(length<<8)|unused[3],ssg_update,was_update,algo[3], r5=tl_tab/slot,
@ r0-r2=scratch, r3=sin_tab/scratch, r4=(length<<8)|dac,unused[2],ssg_update,was_update,algo[3], r5=tl_tab/slot,
@ r6-r7=vol_out[4], r8=eg_timer, r9=eg_timer_add[31:16], r10=op1_out, r11=buffer
.global chan_render_loop @ chan_rend_context *ct, int *buffer, int length
@ -688,8 +688,8 @@ chan_render_loop:
ldr r12, [lr, #0x4c]
ldr r0, [lr, #0x50]
mov r11, r1
and r0, r0, #7
orr r4, r4, r0 @ (length<<8)|algo
and r0, r0, #0x87
orr r4, r4, r0 @ (length<<8)|dac,unused[4],algo[3]
ldr r8, [lr, #0x44] @ eg_timer
ldr r9, [lr, #0x48] @ eg_timer_add
ldr r10, [lr, #0x54] @ op1_out
@ -925,9 +925,12 @@ crl_algo_done:
beq ctl_sample_skip
orr r4, r4, #8 @ have_output
lsr r1, r0, #31 @ clip (saturate) sample to 14 bit
adds r2, r1, r0, asr #13
cmn r1, r0, asr #13
subne r0, r1, #0x80000001
asrne r0, r0, #18
tst r4, r1, lsl #7 @ (sample < 0) && dac?
bicne r0, r0, #0x1f
subne r0, r0, #7<<5
tst r12, #1
beq ctl_sample_mono