/
sfx.gas
509 lines (420 loc) · 9.36 KB
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sfx.gas
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.long
.dc.l codeend-_sfx_start
_sfx_start::
.dsp
.org $f1b140
_internalbuffer = $f1b800
INTERNALQUADS = 256
EXTERNALQUADS = 512
S_LE .ccdef $14 ; PL
U_LE .ccdef $04 ; CC
S_GT .ccdef $18 ; MI
U_GT .ccdef $08 ; CS
S_LT .ccdef $15 ; PL+NE
U_LT .ccdef $05 ; CC+NE
FP .equr r14
scratch .equr r10
scratch2 .equr r11
RETURNVALUE .equr r29
RETURNPOINT .equr r28
MATH_A .equr r27
MATH_B .equr r26
MATH_C .equr r25
MATH_RTS .equr r24
MATH_SIGN .equr r23
movei #codestart,scratch
jump T,(scratch)
nop
;===========================================================================
;
_ClearInternalBuffer:
;
;===========================================================================
movei #_internalbuffer,r0
move r0,r1
move r1,r2
move r2,r3
addq #4,r1
addq #8,r2
addq #12,r3
movei #INTERNALQUADS,r4
moveq #0,r5
clearloop:
store r5,(r0)
addq #16,r0
store r5,(r1)
addq #16,r1
store r5,(r2)
addq #16,r2
store r5,(r3)
subq #1,r4
addqt #16,r3
jr NE,clearloop
nop
jump T,(RETURNPOINT)
nop
;===========================================================================
;
_S_WriteOutSamples:
;
;===========================================================================
sw_source .equr r16
sw_samples .equr r17
sw_dest .equr r18
sw_sample .equr r19
sw_combined .equr r20
sw_zero .equr r21
sw_looppoint .equr r22
sw_mask .equr r23
.extern _sfxsample
load (FP),sw_samples
shlq #2,sw_samples ; in quads
moveq #0,sw_zero
movei #$ffff,sw_mask
movei #_sfxsample,scratch2
load (scratch2),scratch
move scratch,sw_dest
add sw_samples,scratch
add sw_samples,scratch ; 11khz sfx are doubled for 22khz isr
store scratch,(scratch2) ; sfxtime += samples*2
shlq #1,sw_dest
movei #$1fff,scratch
and scratch,sw_dest
movei #$1f0000,scratch
add scratch,sw_dest ; sw_dest = externbuffer[sfxtime*2]
movei #_internalbuffer,sw_source
movei #satloop,sw_looppoint
load (sw_source),sw_sample ; delay slotted
satloop:
store sw_zero,(sw_source)
addq #4,sw_source
sharq #8,sw_sample
sat16s sw_sample
and sw_mask,sw_sample
; double samples for 22 khz isr
move sw_sample,sw_combined
shlq #16,sw_combined
add sw_sample,sw_combined
store sw_combined,(sw_dest)
addqmod #4,sw_dest
subq #1,sw_samples
jump NE,(sw_looppoint)
load (sw_source),sw_sample ; delay slot
jump T,(RETURNPOINT)
nop
;============================================================================
;PaintChannel (unsigned *samples, int *dest, int count, int volume)
_PaintChannel:
;============================================================================
pc_source .equr r0
pc_channel .equr r1
pc_count .equr r3
pc_volume .equr r4
pc_const128 .equr r6
pc_looppoint_p .equr r7
pc_1 .equr r8
pc_2 .equr r9
pc_3 .equr r10
pc_4 .equr r11
pc_1a .equr r17
pc_2a .equr r18
pc_3a .equr r19
pc_4a .equr r20
pc_samples .equr r25
load (FP),pc_source
load (FP+1),pc_channel
load (FP+2),pc_count
load (FP+3),pc_volume
movei #looppoint,pc_looppoint_p
movei #128,pc_const128
load (pc_source),pc_samples
movei #unpack,pc_1
jump T,(pc_1)
addq #4,pc_source
looppoint:
sub pc_const128,pc_1a
imult pc_volume,pc_1a
sub pc_const128,pc_2a
imult pc_volume,pc_2a
sub pc_const128,pc_3a
imult pc_volume,pc_3a
sub pc_const128,pc_4a
imult pc_volume,pc_4a
load (pc_channel),pc_1
addq #4,pc_channel
load (pc_channel),pc_2
addq #4,pc_channel
load (pc_channel),pc_3
addq #4,pc_channel
load (pc_channel),pc_4
subq #12,pc_channel
add pc_1a,pc_1
add pc_2a,pc_2
add pc_3a,pc_3
add pc_4a,pc_4
store pc_1,(pc_channel)
addq #4,pc_channel
store pc_2,(pc_channel)
addq #4,pc_channel
store pc_3,(pc_channel)
addq #4,pc_channel
store pc_4,(pc_channel)
addq #4,pc_channel
; unpack next block of samples
unpack:
move pc_samples,pc_4a ; start using samples
load (pc_source),pc_samples ; start next sample load
addq #4,pc_source
move pc_4a,pc_1a
shrq #24,pc_1a
move pc_4a,pc_2a
shlq #8,pc_2a
shrq #24,pc_2a
move pc_4a,pc_3a
shlq #16,pc_3a
shrq #24,pc_3a
shlq #24,pc_4a
shrq #24,pc_4a
subq #1,pc_count
jump PL,(pc_looppoint_p)
nop
jump T,(RETURNPOINT)
nop
codestart:
; unfuckdsp output -- add loads before external dsp stores
;====================
_MixSfx::
;3 dag registers 7 register variables
;localoffset:16 regoffset:20 argoffset:64
;====================
movei #64,scratch
sub scratch,FP
movei #_ClearInternalBuffer,r0
store r28,(FP+5) ; push ;(RETURNPOINT)
store r21,(FP+6) ; push ;(count)
store r20,(FP+7) ; push ;(stopquad)
store r19,(FP+8) ; push ;(startquad)
store r18,(FP+9) ; push ;(mixcount)
store r17,(FP+10) ; push ;(mixstop)
store r16,(FP+11) ; push ;(mixstart)
movei #L60,RETURNPOINT
jump T,(r0)
store r15,(FP+12) ; delay slot push ;(channel)
L60:
load (FP+6),r21 ; pop ;(count)
load (FP+7),r20 ; pop ;(stopquad)
load (FP+8),r19 ; pop ;(startquad)
load (FP+9),r18 ; pop ;(mixcount)
load (FP+10),r17 ; pop ;(mixstop)
load (FP+11),r16 ; pop ;(mixstart)
load (FP+12),r15 ; pop ;(channel)
load (FP+5), RETURNPOINT ; pop
move FP,r0
addq #16,r0 ; &samplequad
movei #_samplecount,r1
load (r1),r1
sharq #3,r1
load (r0),r30 ; FUCKING dsp!
or r30,r30 ; FUCKING dsp!
store r1,(r0)
movei #_finalquad,r1
load (r1),r2
move r2,r19 ;(startquad)
load (r0),r0
movei #512,r2
add r2,r0
load (r1),r30 ; FUCKING dsp!
or r30,r30 ; FUCKING dsp!
store r0,(r1)
load (r1),r0
sub r19,r0 ;(startquad)
cmp r0,r2
movei #L42,scratch
jump CC,(scratch)
nop
movei #_finalquad,r0
load (r0),r0
movei #512,r1
sub r1,r0
move r0,r19 ;(startquad)
L42:
movei #_sfxsample,r0
move r19,r1 ;(startquad)
shlq #3,r1
load (r0),r30 ; FUCKING dsp!
or r30,r30 ; FUCKING dsp!
store r1,(r0)
movei #L45,r0
jump T,(r0)
nop
L44:
movei #_finalquad,r0
load (r0),r0
sub r19,r0 ;(startquad)
move r0,r21 ;(count)
movei #256,r0
cmp r21,r0 ;(count)
movei #L47,scratch
jump PL,(scratch)
nop
movei #256,r0
move r0,r21 ;(count)
L47:
move r21,r0 ;(count)
move r19,r1 ;(startquad)
add r0,r1
move r1,r20 ;(stopquad)
movei #_sfxchannels,r0
move r0,r15 ;(channel)
movei #L52,r0
jump T,(r0)
nop
L49:
move r15,r0 ;(channel)
addq #4,r0
load (r0),r0
move r0,r16 ;(mixstart)
cmp r16,r19 ;(mixstart)(startquad)
movei #L54,scratch
jump EQ,(scratch)
nop
jump CS,(scratch)
nop
move r19,r16 ;(startquad)(mixstart)
L54:
move r15,r0 ;(channel)
addq #8,r0
load (r0),r0
move r0,r17 ;(mixstop)
cmp r17,r20 ;(mixstop)(stopquad)
movei #L56,scratch
jump CC,(scratch)
nop
move r20,r17 ;(stopquad)(mixstop)
L56:
move r17,r0 ;(mixstop)
sub r16,r0 ;(mixstart)
move r0,r18 ;(mixcount)
moveq #1,r0
cmp r18,r0 ;(mixcount)
movei #L58,scratch
jump EQ,(scratch)
nop
jump MI,(scratch)
nop
movei #L50,r0
jump T,(r0)
nop
L58:
move r15,r0 ;(channel)
addq #4,r0
load (r0),r0
move r16,r1 ;(mixstart)
sub r0,r1
movei #-2,r0
sh r0,r1
load (r15),r2 ;(channel)
add r2,r1
store r1,(FP) ; arg[]
move r16,r1 ;(mixstart)
sub r19,r1 ;(startquad)
shlq #3,r1
sh r0,r1
movei #_internalbuffer,r0
add r0,r1
or r1,scratch ; scoreboard bug
store r1,(FP+1) ; arg[]
or r18,scratch ; scoreboard bug ;(mixcount)
store r18,(FP+2) ; arg[] ;(mixcount)
move r15,r0 ;(channel)
addq #12,r0
load (r0),r0
or r0,scratch ; scoreboard bug
store r0,(FP+3) ; arg[]
movei #_PaintChannel,r0
store r28,(FP+5) ; push ;(RETURNPOINT)
store r21,(FP+6) ; push ;(count)
store r20,(FP+7) ; push ;(stopquad)
store r19,(FP+8) ; push ;(startquad)
store r18,(FP+9) ; push ;(mixcount)
store r17,(FP+10) ; push ;(mixstop)
store r16,(FP+11) ; push ;(mixstart)
movei #L61,RETURNPOINT
jump T,(r0)
store r15,(FP+12) ; delay slot push ;(channel)
L61:
load (FP+6),r21 ; pop ;(count)
load (FP+7),r20 ; pop ;(stopquad)
load (FP+8),r19 ; pop ;(startquad)
load (FP+9),r18 ; pop ;(mixcount)
load (FP+10),r17 ; pop ;(mixstop)
load (FP+11),r16 ; pop ;(mixstart)
load (FP+12),r15 ; pop ;(channel)
load (FP+5), RETURNPOINT ; pop
L50:
move r15,r0 ;(channel)
addq #24,r0
move r0,r15 ;(channel)
L52:
move r15,r0 ;(channel)
movei #_sfxchannels+96,r1
cmp r0,r1
movei #L49,scratch
jump U_LT,(scratch)
nop
store r21,(FP) ; arg[] ;(count)
movei #_S_WriteOutSamples,r0
store r28,(FP+5) ; push ;(RETURNPOINT)
store r21,(FP+6) ; push ;(count)
store r20,(FP+7) ; push ;(stopquad)
store r19,(FP+8) ; push ;(startquad)
store r18,(FP+9) ; push ;(mixcount)
store r17,(FP+10) ; push ;(mixstop)
store r16,(FP+11) ; push ;(mixstart)
movei #L62,RETURNPOINT
jump T,(r0)
store r15,(FP+12) ; delay slot push ;(channel)
L62:
load (FP+6),r21 ; pop ;(count)
load (FP+7),r20 ; pop ;(stopquad)
load (FP+8),r19 ; pop ;(startquad)
load (FP+9),r18 ; pop ;(mixcount)
load (FP+10),r17 ; pop ;(mixstop)
load (FP+11),r16 ; pop ;(mixstart)
load (FP+12),r15 ; pop ;(channel)
load (FP+5), RETURNPOINT ; pop
move r20,r19 ;(stopquad)(startquad)
L45:
movei #_finalquad,r0
load (r0),r0
cmp r19,r0 ;(startquad)
movei #L44,scratch
jump U_LT,(scratch)
nop
movei #_soundtics,r0
movei #_samplecount,r1
load (r1),r1
movei #_soundstarttics,r2
load (r2),r2
sub r2,r1
load (r0),r30 ; FUCKING dsp!
or r30,r30 ; FUCKING dsp!
store r1,(r0)
L41:
movei #64,scratch
jump T,(RETURNPOINT)
add scratch,FP ; delay slot
;=======================
.extern _ClearInternalBuffer
.extern _PaintChannel
.extern _internalbuffer
.extern _samplecount
.extern _sfxsample
.extern _soundstarttics
.extern _soundtics
.extern _finalquad
.extern _sfxchannels
.extern _S_WriteOutSamples
.phrase
.68000
codeend: