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antoine-source/egerie/midi.s
Antoine Vignau 50da8046af v1
2023-09-03 19:47:55 +02:00

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*
* Midi routines
*
* (c) 2020, Brutal Deluxe Software
* Antoine Vignau & Olivier Zardini
*
dpSEQ = $f8
seqOFFSET = $006
seqTEMPO = $18A
seqTPB = $190
*--------------------------------------
mx %00
stopMIDI
lda fgMIDI
bne stopMIDI99
_KillAllNotes ; Stop MidiSynth
_MSShutDown
PushWord #35 ; unload MidiSynth
_UnloadOneTool
_SoundShutDown
stopMIDI99
rts
*--------------------------------------
initMIDI
pha ; Check for AppleTalk
_GetIRQEnable
pla
and #$20
beq initMIDI1
inc fgMIDI
rts
initMIDI1
lda myDP
clc
adc #$100
pha
_SoundStartUp
PushWord #35 ; Load MidiSynth
PushWord #0
_LoadOneTool
bcc initMIDI2
inc fgMIDI
rts
initMIDI2
_MSStartUp ; Start MidiSynth
bcc musicMEMORY
inc fgMIDI
rts
*-------------------------------------- Now, get RAM
musicMEMORY
PushLong #0
PushLong #$10000
PushWord myID
PushWord #%11000000_00011100
PushLong #0
_NewHandle
phd
tsc
tcd
lda [3]
sta ptrSEQ
ldy #2
lda [3],y
sta ptrSEQ+2
pld
pla
pla
bcc musicMEMORY1
inc fgMIDI ; cannot assign memory for MIDI sequences
rts
musicMEMORY1
PushLong #0
PushLong #$10000
PushWord myID
PushWord #%11000000_00011100
PushLong #0
_NewHandle
phd
tsc
tcd
lda [3]
sta ptrBNK
ldy #2
lda [3],y
sta ptrBNK+2
pld
pla
pla
bcc musicMEMORY2
inc fgMIDI ; cannot assign memory for MIDI sequences
rts
musicMEMORY2
PushLong #0
PushLong #$10000
PushWord myID
PushWord #%11000000_00011100
PushLong #0
_NewHandle
phd
tsc
tcd
lda [3]
sta ptrWAV
ldy #2
lda [3],y
sta ptrWAV+2
pld
pla
pla
bcc loadWAV
inc fgMIDI ; cannot assign memory for MIDI sequences
rts
*-------------------------------------- Load WAV
loadWAV
lda #pWAV
sta midiOPEN+4
jsl GSOS
dw $2010
adrl midiOPEN
sta midiERR
lda midiOPEN+2
sta midiSETMARK+2
sta midiREAD+2
sta midiCLOSE+2
jsl GSOS
dw $2016
adrl midiSETMARK
lda ptrWAV
sta midiREAD+4
lda ptrWAV+2
sta midiREAD+6
stz midiREAD+8
lda #1
sta midiREAD+10
jsl GSOS
dw $2012
adrl midiREAD
sta midiERR
jsl GSOS
dw $2014
adrl midiCLOSE
lda midiERR ; check err
beq loadBNK
inc fgMIDI ; exit
rts
*-------------------------------------- Load BNK
loadBNK
lda #pBNK ; load the MIDI bank
ldx ptrBNK+2
ldy ptrBNK
jsr loadGSOS
lda midiERR ; check err
beq loadSEQUENCE
inc fgMIDI
rts
*-------------------------------------- Load Sequence
loadSEQUENCE
lda #pSEQ
ldx ptrSEQ+2
ldy ptrSEQ
jsr loadGSOS
lda midiERR ; check err
beq initMUSIC
inc fgMIDI
rts
*-------------------------------------- Play sequence
initMUSIC
lda ptrSEQ
sta playMUSIC5+1 ; save pointers
sta playMUSIC55+1
lda ptrSEQ+2
sta playMUSIC6+1
sta playMUSIC66+1
_KillAllNotes
lda myDP
tcd
playMUSIC5
lda #$bdbd ; patched
sta dpSEQ
playMUSIC6
lda #$bdbd ; patched
sta dpSEQ+2
ldy #seqOFFSET
lda [dpSEQ],y
clc
playMUSIC55
adc #$bdbd ; patched
sta seqPlayRec
lda #0
playMUSIC66
adc #$bdbd ; patched
sta seqPlayRec+2
ldy #seqTEMPO
lda [dpSEQ],y
asl
sec
sbc #10
pha
_SetTempo
ldy #seqTPB
lda [dpSEQ],y
pha
_SetBeat
*--- Toutes les pistes sont actives
lda ptrBNK
clc
adc #$400
sta ptrINST
lda ptrBNK+2
adc #0
sta ptrINST+2
stz myINDEX
]lp PushWord myINDEX
PushWord #$8000
_SetPlayTrack
PushWord myINDEX
PushWord #-1
_TrackToChannel
PushWord myINDEX
PushWord #2
_SetTrackOut
PushLong ptrINST
PushWord myINDEX
_SetInstrument
lda ptrINST
clc
adc #$120
sta ptrINST
lda ptrINST+2
adc #0
sta ptrINST+2
inc myINDEX
lda myINDEX
cmp #16
bne ]lp
*---
sei
PushLong ptrWAV
PushWord #0 ; docStart
PushWord #0 ; byteCount (=64ko)
_WriteRamBlock
PushLong #callBackRec
_SetCallBack
PushWord #0
PushWord #0
PushLong seqClock
PushLong seqPlayRec
_Locate
PullLong seqPlayRec
cli ; end of the long init!
rts
*--------------------------------------
doMUSIK
lda fgMIDI ; can we play?
bne nozik99
lda fgMIDIPLAY
eor #1
sta fgMIDIPLAY
beq doSOUNDON
bne doSOUNDOFF
nozik99
rts
fgMIDIPLAY ds 2
*--------------------------------------
doSOUNDON
lda fgMIDI ; can we play?
bne playMUSIC99
lda #$0100 ; no, let's start playing!
sta seqPlay
PushLong #seqPlayRec
_SeqPlayer
stz fgLOOP
playMUSIC99
rts
*--------------------------------------
doSOUNDOFF
lda fgMIDI
bne stopMUSIC99
stz seqPlay
PushLong #seqPlayRec
_SeqPlayer
_KillAllNotes
stopMUSIC99
rts
*-------------------------------------- Suspend music
suspendMUSIC
lda fgMIDI
ora fgMIDIPLAY
bne suspendMUSIC9
_MSSuspend
suspendMUSIC9
rts
*-------------------------------------- Resume music
resumeMUSIC
lda fgMIDI
ora fgMIDIPLAY
bne resumeMUSIC9
_MSResume
resumeMUSIC9
rts
*--------------------------------------
checkREPLAY
lda fgMIDI
bne checkREPLAY99
lda fgLOOP
beq checkREPLAY99
jsr doSOUNDON
checkREPLAY99
rts
*--------------------------------------
replayMUSIC
lda #-1
stal fgLOOP
rtl
fgLOOP dw -1
*-------------------------------------- Select random sequence
randomMIDI
jsr Random ; get random 0-7
and #7
bcc randomMIDI
jsr midi_setit ; check file exists
bcc mr_ok ; it is ok, it is the sequence
lda #0 ; force sequence 1
jsr midi_setit
mr_ok rts
*-------------------------------------- Check a sequence
midi_setit
clc
adc #'1'
sep #$20
sta pSEQ+26
rep #$20
lda #pSEQ ; check file exists
sta midiOPEN+4
jsl GSOS
dw $2010
adrl midiOPEN
bcs midi_setit99
lda midiOPEN+2
sta midiCLOSE+2
jsl GSOS
dw $2014
adrl midiCLOSE
midi_setit99
rts
*-------------------------------------- Load a file
loadGSOS
sta midiOPEN+4
sty midiREAD+4
stx midiREAD+6
stz midiERR
jsl GSOS
dw $2010
adrl midiOPEN
bcs loadGSOSERR
lda midiOPEN+2
sta midiREAD+2
sta midiCLOSE+2
lda midiEOF
sta midiREAD+8
lda midiEOF+2
sta midiREAD+10
jsl GSOS
dw $2012
adrl midiREAD
bcs loadGSOSERR
loadGSOS2
jsl GSOS
dw $2014
adrl midiCLOSE
rts
loadGSOSERR
jsr loadGSOS2
inc fgMIDI
rts
*-------------------------------------- DATA
myINDEX ds 2
*--- GS/OS
midiERR ds 2
midiOPEN dw 12
ds 2
adrl pSEQ
ds 2
ds 2
ds 2
ds 2
ds 4
ds 2
ds 8
ds 8
ds 4
midiEOF ds 4
midiREAD dw 4
ds 2
ds 4
ds 4
ds 4
midiCLOSE dw 1
ds 2
midiSETMARK dw 3
ds 2
ds 2
adrl $900 ; +$900 pour WAV
*--- GS/OS Strings (+26 pour le random de la musique)
pSEQ strl '1/data/musiques/sequence1'
pWAV strl '1/data/musiques/piano.wav'
pBNK strl '1/data/musiques/piano.bnk'
*--- Memory
ptrSEQ ds 4
ptrWAV ds 4
ptrBNK ds 4
*--- Flags
fgMIDI ds 2 ; can play MIDI if 0
*--- Instruments
ptrINST ds 4
*--- MidiSynth
seqPlayRec
ds 4
ds 4
ds 4
ds 4
seqPlay ds 2 ; Play
seqClock ds 4
callBackRec adrl replayMUSIC ; When sequence ends !
ds 4
ds 4
ds 4
ds 4
ds 4
ds 4
ds 4
ds 4
ds 4
ds 4
ds 4
ds 4
ds 4
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