mirror of
https://github.com/cc65/cc65.git
synced 2024-10-31 20:06:11 +00:00
1271 lines
32 KiB
ArmAsm
1271 lines
32 KiB
ArmAsm
;
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; Sound driver for the Atari Lynx.
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;
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; Karri Kaksonen and Bjoern Spruck, 11.12.2012
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;
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.include "lynx.inc"
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.include "zeropage.inc"
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.export _lynx_snd_init
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.export _lynx_snd_active
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.export _lynx_snd_play
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.export _lynx_snd_stop
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.export _lynx_snd_stop_channel
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.export _lynx_snd_pause
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.export _lynx_snd_continue
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.interruptor lynx_snd_handler
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.import popa
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.importzp ptr1
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;----------------------------------------------------------------------------
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; ZP variables that go into APPZP
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;
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.segment "APPZP" : zeropage
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SndSema: .res 1
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SndPtrTmp: .res 2
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SndTmp: .res 2
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SndEnvPtr: .res 2
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;----------------------------------------------------------------------------
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; Global variables
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;
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.bss
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SndRetAFlag2: .res 1
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SndRetAFlag: .res 1
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SndPtrLo: .res 4
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SndPtrHi: .res 4
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SndDelay: .res 4
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SndLoopCnt: .res 4
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SndLoopPtrLo: .res 4
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SndLoopPtrHi: .res 4
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SndVolume: .res 4
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SndMaxVolume: .res 4
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SndNotePlaying: .res 4
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SndRetAddr: .res 8
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SndActive: .res 4
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SndReqStop: .res 4
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SndEnvVol: .res 4
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SndEnvFrq: .res 4
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SndEnvWave: .res 4
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SndChannel: .res 32
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SndEnvVolCnt: .res 4
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SndEnvVolInc: .res 4
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SndEnvVolOff: .res 4
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SndEnvVolLoop: .res 4
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SndEnvVolParts: .res 4
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SndEnvVolParts2: .res 4
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SndEnvFrqCnt: .res 4
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SndEnvFrqInc: .res 4
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SndEnvFrqOff: .res 4
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SndEnvFrqLoop: .res 4
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SndEnvFrqParts: .res 4
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SndEnvFrqParts2: .res 4
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SndEnvWaveCnt: .res 4
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SndEnvWaveOff: .res 4
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SndEnvWaveLoop: .res 4
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SndEnvWaveParts: .res 4
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SndEnvWaveParts2: .res 4
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MAX_INSTRUMENTS .set 64
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SndEnvVolPtrLo: .res MAX_INSTRUMENTS
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SndEnvVolPtrHi: .res MAX_INSTRUMENTS
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SndEnvFrqPtrLo: .res MAX_INSTRUMENTS
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SndEnvFrqPtrHi: .res MAX_INSTRUMENTS
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SndEnvWavePtrLo: .res MAX_INSTRUMENTS
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SndEnvWavePtrHi: .res MAX_INSTRUMENTS
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.rodata
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SndOffsets: .byte $00,$08,$10,$18
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;----------------------------------------------------------------------------
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; Macros
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;
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if_count .set 0
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nest_count .set 0
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.macro _IFNE
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if_count .set if_count +1
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nest_count .set nest_count +1
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beq .ident (.sprintf ("else%04d", if_count))
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.ident (.sprintf ("push%04d", nest_count)) .set if_count
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.endmacro
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.macro _IFEQ
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if_count .set if_count +1
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nest_count .set nest_count +1
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bne .ident (.sprintf ("else%04d", if_count))
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.ident (.sprintf ("push%04d", nest_count)) .set if_count
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.endmacro
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.macro _IFMI
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if_count .set if_count +1
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nest_count .set nest_count +1
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bpl .ident (.sprintf ("else%04d", if_count))
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.ident (.sprintf ("push%04d", nest_count)) .set if_count
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.endmacro
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.macro _IFPL
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if_count .set if_count +1
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nest_count .set nest_count +1
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bmi .ident (.sprintf ("else%04d", if_count))
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.ident (.sprintf ("push%04d", nest_count)) .set if_count
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.endmacro
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.macro _IFGE
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if_count .set if_count +1
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nest_count .set nest_count +1
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bcc .ident (.sprintf ("else%04d", if_count))
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.ident (.sprintf ("push%04d", nest_count)) .set if_count
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.endmacro
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.macro _IFCS
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if_count .set if_count +1
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nest_count .set nest_count +1
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bcc .ident (.sprintf ("else%04d", if_count))
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.ident (.sprintf ("push%04d", nest_count)) .set if_count
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.endmacro
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.macro _IFCC
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if_count .set if_count +1
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nest_count .set nest_count +1
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bcs .ident (.sprintf ("else%04d", if_count))
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.ident (.sprintf ("push%04d", nest_count)) .set if_count
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.endmacro
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.macro _ELSE
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bra .ident (.sprintf ("endif%04d", .ident (.sprintf ("push%04d", nest_count))))
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.ident (.sprintf ("else%04d", .ident (.sprintf ("push%04d", nest_count)))) := *
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.endmacro
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.macro _ENDIF
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.if .not .defined( .ident (.sprintf ("else%04d", .ident (.sprintf ("push%04d", nest_count)))))
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.ident (.sprintf ("else%04d", .ident (.sprintf ("push%04d", nest_count)))) := *
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.endif
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.ident (.sprintf ("endif%04d", .ident (.sprintf ("push%04d", nest_count)))) := *
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nest_count .set nest_count -1
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.endmacro
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.code
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;----------------------------------------------------------------------------
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; void lynx_snd_init() will initialize the sound engine.
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;
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_31250Hz .set %101
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_lynx_snd_init:
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php
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sei
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lda #%10011000|_31250Hz
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sta STIMCTLA
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lda #129
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sta STIMBKUP ; set up a 240Hz IRQ
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stz AUD0VOL
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stz AUD1VOL
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stz AUD2VOL
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stz AUD3VOL
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stz $fd44 ; all channels full volume / no attenuation
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lda #$ff
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stz MSTEREO
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lda #0
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sta AUD0CTLA
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sta AUD1CTLA
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sta AUD2CTLA
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sta AUD3CTLA
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ldx #3
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lda #0
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init0: stz SndActive,x
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stz SndReqStop,x
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stz SndEnvVol,x
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stz SndEnvFrq,x
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stz SndEnvWave,x
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ldy SndOffsets,x
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sta SndChannel+2,y
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dex
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bpl init0
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stz SndRetAFlag
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stz SndRetAFlag2
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stz SndSema
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plp
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rts
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;----------------------------------------------------------------------------
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; lynx_snd_handler is run at every sound interrupt
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;
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lynx_snd_handler:
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lda INTSET
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and #SND_INTERRUPT
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bne @L0
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clc
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rts
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@L0:
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lda #$ff
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tsb SndSema
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bne endirq
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phy
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; *NOW* set all values which were "pre-set" in last interrupt
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jsr SndSetValues
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cli
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lda SndRetAFlag ; reset the return flag, but save it first
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_IFNE
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lda #$0F ; MASK
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sta SndRetAFlag2
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stz SndRetAFlag
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_ENDIF
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ldx #3
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irq0: phx
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lda SndActive,x
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_IFNE
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lda SndEnvVol,x
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_IFNE
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phx
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jsr SndChangeVol
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plx
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_ENDIF
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lda SndEnvFrq,x
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_IFNE
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phx
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jsr SndChangeFrq
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plx
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_ENDIF
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lda SndEnvWave,x
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_IFNE
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phx
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jsr SndChangeWave
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plx
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_ENDIF
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jsr SndGetCmd
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_ENDIF
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plx
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dex
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bpl irq0
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sei
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ply
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stz SndSema
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endirq:
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clc
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rts
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;----------------------------------------------------------------------------
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; A process table with addresses to sound functions
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;
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SndCmdsLo:
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.byte <((SndLoop)-1)
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.byte <((SndDo)-1)
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.byte <((SndPause)-1)
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.byte <((SndNoteOff)-1)
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.byte <((SndSetInstr)-1)
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.byte <((SndNewNote2)-1)
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.byte <((SndCallPattern)-1)
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.byte <((SndRetToSong)-1)
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.byte <((SndDefEnvVol)-1)
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.byte <((SndSetEnvVol)-1)
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.byte <((SndDefEnvFrq)-1)
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.byte <((SndSetEnvFrq)-1)
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.byte <((SndDefEnvWave)-1)
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.byte <((SndSetEnvWave)-1)
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.byte <((SndSetStereo)-1)
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.byte <((SndSetAttenuationOn)-1)
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.byte <((SndSetChnAttenution)-1)
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.byte <((SndPlayerFreq)-1)
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.byte <((SndReturnAll)-1)
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SndCmdsHi:
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.byte >((SndLoop)-1)
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.byte >((SndDo)-1)
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.byte >((SndPause)-1)
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.byte >((SndNoteOff)-1)
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.byte >((SndSetInstr)-1)
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.byte >((SndNewNote2)-1)
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.byte >((SndCallPattern)-1)
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.byte >((SndRetToSong)-1)
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.byte >((SndDefEnvVol)-1)
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.byte >((SndSetEnvVol)-1)
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.byte >((SndDefEnvFrq)-1)
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.byte >((SndSetEnvFrq)-1)
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.byte >((SndDefEnvWave)-1)
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.byte >((SndSetEnvWave)-1)
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.byte >((SndSetStereo)-1)
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.byte >((SndSetAttenuationOn)-1)
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.byte >((SndSetChnAttenution)-1)
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.byte >((SndPlayerFreq)-1)
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.byte >((SndReturnAll)-1)
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;----------------------------------------------------------------------------
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; Get next sound command from stream
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;
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SndGetCmd:
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lda SndReqStop,x
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bne SndStop
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lda SndRetAFlag2
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and SndMask,x
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_IFNE
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eor SndRetAFlag2
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sta SndRetAFlag2
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lda SndRetAddr,x
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sta SndPtrLo,x
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lda SndRetAddr+4,x
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sta SndPtrHi,x
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;;; force the direct continue return
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_ELSE
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dec SndDelay,x
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bne cmd991 ;; check special case
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_ENDIF
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lda SndPtrLo,x
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sta SndPtrTmp
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lda SndPtrHi,x
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sta SndPtrTmp+1
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cmd0: lda (SndPtrTmp)
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beq SndStop
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_IFMI
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and #$7f
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tay
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jsr SndCallCmd
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_ELSE
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jsr SndNewNote
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_ENDIF
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clc
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tya
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and #$7f
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adc SndPtrTmp
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sta SndPtrLo,x
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sta SndPtrTmp
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lda #0
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adc SndPtrTmp+1
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sta SndPtrHi,x
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sta SndPtrTmp+1
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tya
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bmi cmd0
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cmd991:
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;; now check if delay is only 1 AND next one is return all.
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lda #1
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cmp SndDelay,x
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bne cmd99
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;; NOW read ahead ONE
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lda SndPtrLo,x
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sta SndPtrTmp
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lda SndPtrHi,x
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sta SndPtrTmp+1
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lda (SndPtrTmp)
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cmp #$92 ;; Return all
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_IFEQ
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sta SndRetAFlag ; just set !=0
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_ENDIF
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cmd99: rts
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;----------------------------------------------------------------------------
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; Call function pointed to by y
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;
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SndCallCmd:
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lda SndCmdsHi,y
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pha
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lda SndCmdsLo,y
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pha
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ldy #1
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rts
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;----------------------------------------------------------------------------
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; Stop sound on one channel
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;
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SndStop:
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stz SndReqStop,x
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stz SndActive,x
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ldy SndOffsets,x
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lda #0
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sta SndChannel,y
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ina ;lda #1
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sta SndChannel+2,y
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tay ;ldy #1
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rts
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;----------------------------------------------------------------------------
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; Send a new note, length, volume triplet
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;
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SndNewNote:
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phx
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sta SndNotePlaying,x
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pha
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ldy #1
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lda (SndPtrTmp),y
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sta SndDelay,x
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ldy SndOffsets,x
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lda SndVolume,x
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sta SndChannel,y
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plx
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lda SndPrescaler,x
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sta SndChannel+5,y
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lda SndReload,x
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sta SndChannel+4,y
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lda #$FF ; = -1
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sta SndChannel+2,y
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plx
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lda SndEnvVol,x
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_IFNE
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jsr SndSetEnvVol1
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_ENDIF
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lda SndEnvFrq,x
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_IFNE
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jsr SndSetEnvFrq1
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_ENDIF
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lda SndEnvWave,x
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_IFNE
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jsr SndSetEnvWave1
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_ENDIF
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lda #$2
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ldy SndDelay,x
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_IFNE
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ora #$80
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_ENDIF
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tay
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rts
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;----------------------------------------------------------------------------
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; Start a loop with count
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;
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SndLoop:
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lda (SndPtrTmp),y
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sta SndLoopCnt,x
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lda SndPtrTmp
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sta SndLoopPtrLo,x
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lda SndPtrTmp+1
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sta SndLoopPtrHi,x
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ldy #$82
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rts
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SndDo:
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dec SndLoopCnt,x
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_IFNE
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lda SndLoopPtrLo,x
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sta SndPtrTmp
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lda SndLoopPtrHi,x
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sta SndPtrTmp+1
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ldy #$82
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_ELSE
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ldy #$81
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_ENDIF
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rts
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;----------------------------------------------------------------------------
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; Sound volume envelope
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;
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SndDefEnvVol:
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phx
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lda (SndPtrTmp),y ; env #
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tax
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iny
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lda (SndPtrTmp),y
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sta SndEnvVolPtrLo,x
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iny
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lda (SndPtrTmp),y
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sta SndEnvVolPtrHi,x ; Ptr to [cnt,inc]
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ldy #$84
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plx
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rts
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SndSetEnvVol:
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lda (SndPtrTmp),y ; # env
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SndSetEnvVol1:
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and #$7f
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sta SndEnvVol,x ; save
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_IFEQ
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ldy #$82
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rts
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_ENDIF
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tay
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lda SndEnvVolPtrLo,y
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sta SndEnvPtr
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lda SndEnvVolPtrHi,y
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sta SndEnvPtr+1
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lda (SndEnvPtr)
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sta SndTmp
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asl
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sta SndEnvVolLoop,x ; here is the loop-start
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ldy #1
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lda (SndEnvPtr),y
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sta SndEnvVolParts,x
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sec
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sbc SndTmp
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sta SndEnvVolParts2,x
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stz SndEnvVolCnt,x
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lda #2
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sta SndEnvVolOff,x
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ldy #$82
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rts
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;----------------------------------------------------------------------------
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; Sound frequency envelope
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;
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SndDefEnvFrq:
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phx
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lda (SndPtrTmp),y ; env #
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tax
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iny
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lda (SndPtrTmp),y
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sta SndEnvFrqPtrLo,x
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iny
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lda (SndPtrTmp),y
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sta SndEnvFrqPtrHi,x ; Ptr to [inc,cnt]
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plx
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ldy #$84
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rts
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SndSetEnvFrq:
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lda (SndPtrTmp),y ; # env
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SndSetEnvFrq1:
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and #$7f
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sta SndEnvFrq,x ; save
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_IFEQ
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ldy #$82
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rts
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_ENDIF
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tay
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lda SndEnvFrqPtrLo,y
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sta SndEnvPtr
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lda SndEnvFrqPtrHi,y
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sta SndEnvPtr+1
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lda (SndEnvPtr)
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sta SndTmp
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asl
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sta SndEnvFrqLoop,x
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ldy #1
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lda (SndEnvPtr),y
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sta SndEnvFrqParts,x
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sec
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sbc SndTmp
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sta SndEnvFrqParts2,x
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stz SndEnvFrqCnt,x
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lda #2
|
|
sta SndEnvFrqOff,x
|
|
|
|
ldy #$82
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; Sound frequency envelope
|
|
;
|
|
|
|
SndDefEnvWave:
|
|
|
|
phx
|
|
lda (SndPtrTmp),y ; env #
|
|
tax
|
|
|
|
iny
|
|
lda (SndPtrTmp),y
|
|
sta SndEnvWavePtrLo,x
|
|
iny
|
|
lda (SndPtrTmp),y
|
|
sta SndEnvWavePtrHi,x ; Ptr to [inc,cnt]
|
|
plx
|
|
ldy #$84
|
|
rts
|
|
|
|
SndSetEnvWave:
|
|
lda (SndPtrTmp),y ; # env
|
|
|
|
SndSetEnvWave1:
|
|
and #$7f
|
|
sta SndEnvWave,x ; save
|
|
_IFEQ
|
|
ldy #$82
|
|
rts
|
|
_ENDIF
|
|
|
|
tay
|
|
|
|
lda SndEnvWavePtrLo,y
|
|
sta SndEnvPtr
|
|
lda SndEnvWavePtrHi,y
|
|
sta SndEnvPtr+1
|
|
|
|
lda (SndEnvPtr)
|
|
sta SndTmp
|
|
asl ; *4 -2
|
|
dea
|
|
asl
|
|
sta SndEnvWaveLoop,x
|
|
|
|
ldy #1
|
|
lda (SndEnvPtr),y
|
|
sta SndEnvWaveParts,x
|
|
sec
|
|
sbc SndTmp
|
|
sta SndEnvWaveParts2,x
|
|
|
|
stz SndEnvWaveCnt,x
|
|
lda #2
|
|
sta SndEnvWaveOff,x
|
|
|
|
ldy #$82
|
|
rts
|
|
|
|
;----------------------------------------------------------------------------
|
|
; Pause sound
|
|
;
|
|
|
|
SndPause:
|
|
lda (SndPtrTmp),y
|
|
sta SndDelay,x
|
|
iny
|
|
SndDummy: rts
|
|
;;;* This set the new Player Freq instantanious!!!
|
|
SndPlayerFreq:
|
|
lda (SndPtrTmp),y
|
|
sta STIMCTLA
|
|
iny
|
|
lda (SndPtrTmp),y
|
|
sta STIMBKUP
|
|
ldy #$83
|
|
rts
|
|
|
|
SndNoteOff:
|
|
ldy SndOffsets,x
|
|
stz SndNotePlaying,x
|
|
lda SndEnvVol,x
|
|
ora #$80
|
|
sta SndEnvVol,x
|
|
lda SndEnvFrq,x
|
|
ora #$80
|
|
sta SndEnvFrq,x
|
|
lda SndEnvWave,x
|
|
ora #$80
|
|
sta SndEnvWave,x
|
|
lda #0
|
|
sta SndChannel,y
|
|
sta SndChannel+4,y
|
|
sta SndChannel+5,y
|
|
dea
|
|
sta SndChannel+2,y
|
|
ldy #$81
|
|
rts
|
|
SndSetInstr:
|
|
phx
|
|
lda SndOffsets,x
|
|
tax
|
|
lda (SndPtrTmp),y
|
|
sta SndChannel+3,x
|
|
iny
|
|
lda (SndPtrTmp),y
|
|
sta SndChannel+7,x
|
|
iny
|
|
lda (SndPtrTmp),y
|
|
sta SndChannel+1,x
|
|
plx
|
|
iny
|
|
lda (SndPtrTmp),y
|
|
sta SndVolume,x
|
|
iny
|
|
lda (SndPtrTmp),y
|
|
sta SndMaxVolume,x
|
|
|
|
ldy #$86
|
|
rts
|
|
SndCallPattern:
|
|
clc
|
|
lda SndPtrTmp
|
|
adc #3
|
|
sta SndRetAddr,x
|
|
lda SndPtrTmp+1
|
|
adc #0
|
|
sta SndRetAddr+4,x
|
|
ldy #1
|
|
lda (SndPtrTmp),y
|
|
pha
|
|
iny
|
|
lda (SndPtrTmp),y
|
|
sta SndPtrTmp+1
|
|
pla
|
|
sta SndPtrTmp
|
|
ldy #$80
|
|
rts
|
|
|
|
SndRetToSong:
|
|
lda SndRetAddr,x
|
|
sta SndPtrTmp
|
|
lda SndRetAddr+4,x
|
|
sta SndPtrTmp+1
|
|
ldy #$80
|
|
rts
|
|
|
|
SndReturnAll:
|
|
lda #1
|
|
sta SndRetAFlag
|
|
sta SndDelay,x
|
|
ldy #$0
|
|
rts
|
|
SndNewNote2:
|
|
;;; Note,length,volume
|
|
|
|
phx
|
|
sta SndNotePlaying,x
|
|
ldy #1
|
|
lda (SndPtrTmp),y ; reload
|
|
pha
|
|
iny
|
|
lda (SndPtrTmp),y ; prescale
|
|
pha
|
|
iny
|
|
lda (SndPtrTmp),y ; laenge
|
|
sta SndDelay,x
|
|
|
|
ldy SndOffsets,x
|
|
lda SndVolume,x
|
|
sta SndChannel,y
|
|
pla
|
|
sta SndChannel+5,y
|
|
pla
|
|
sta SndChannel+4,y
|
|
lda #$FF ; = -1
|
|
sta SndChannel+2,y
|
|
plx
|
|
lda SndEnvVol,x
|
|
_IFNE
|
|
jsr SndSetEnvVol1
|
|
_ENDIF
|
|
lda SndEnvFrq,x
|
|
_IFNE
|
|
jsr SndSetEnvFrq1
|
|
_ENDIF
|
|
lda SndEnvWave,x
|
|
_IFNE
|
|
jsr SndSetEnvWave1
|
|
_ENDIF
|
|
ldy #4
|
|
rts
|
|
|
|
SndSetStereo:
|
|
ldy #1
|
|
lda (SndPtrTmp),y
|
|
sta MSTEREO
|
|
ldy #$82
|
|
rts
|
|
|
|
SndSetAttenuationOn:
|
|
ldy #1
|
|
lda (SndPtrTmp),y
|
|
sta $FD44
|
|
ldy #$82
|
|
rts
|
|
|
|
SndSetChnAttenution:
|
|
ldy #1
|
|
lda (SndPtrTmp),y
|
|
sta $FD40,x
|
|
ldy #$82
|
|
rts
|
|
|
|
SndChangeVol:
|
|
tay
|
|
_IFMI
|
|
vol99: rts
|
|
_ENDIF
|
|
lda SndNotePlaying,x
|
|
beq vol99
|
|
|
|
lda SndEnvVolPtrLo,y
|
|
sta SndEnvPtr
|
|
lda SndEnvVolPtrHi,y
|
|
sta SndEnvPtr+1
|
|
|
|
dec SndEnvVolCnt,x
|
|
_IFMI
|
|
dec SndEnvVolParts,x
|
|
_IFMI
|
|
lda SndEnvVolLoop,x
|
|
_IFNE
|
|
tay
|
|
lda SndEnvVolParts2,x
|
|
sta SndEnvVolParts,x
|
|
bra vol1v
|
|
_ELSE
|
|
tya
|
|
ora #$80
|
|
sta SndEnvVol,x
|
|
_ENDIF
|
|
_ELSE
|
|
ldy SndEnvVolOff,x
|
|
vol1v: lda (SndEnvPtr),y
|
|
sta SndEnvVolCnt,x
|
|
iny
|
|
lda (SndEnvPtr),y
|
|
sta SndEnvVolInc,x
|
|
iny
|
|
tya
|
|
sta SndEnvVolOff,x
|
|
_ENDIF
|
|
rts
|
|
_ENDIF
|
|
|
|
ldy SndOffsets,x
|
|
clc
|
|
lda SndEnvVolInc,x
|
|
_IFEQ
|
|
rts
|
|
_ENDIF
|
|
_IFPL
|
|
adc SndChannel,y
|
|
cmp SndMaxVolume,x
|
|
_IFCS
|
|
lda SndMaxVolume,x
|
|
stz SndEnvVolInc,x
|
|
_ENDIF
|
|
cmp #$80
|
|
_IFGE
|
|
lda #$7f
|
|
stz SndEnvVolInc,x
|
|
_ENDIF
|
|
_ELSE
|
|
adc SndChannel,y
|
|
_IFCC
|
|
lda #0
|
|
sta SndEnvVolInc,x
|
|
;; NEU: switch Tremolo off
|
|
sta SndNotePlaying,x
|
|
_ENDIF
|
|
cmp #$80
|
|
_IFGE
|
|
lda #0
|
|
sta SndEnvVolInc,x
|
|
;; NEU: switch Tremolo off
|
|
sta SndNotePlaying,x
|
|
_ENDIF
|
|
_ENDIF
|
|
sta SndChannel,y
|
|
lda SndChannel+2,y
|
|
ora #1 ;; if already -1 ... no effect
|
|
sta SndChannel+2,y
|
|
rts
|
|
|
|
|
|
SndChangeFrq:
|
|
tay
|
|
_IFMI
|
|
frq99: rts
|
|
_ENDIF
|
|
lda SndNotePlaying,x
|
|
beq frq99
|
|
|
|
lda SndEnvFrqPtrLo,y
|
|
sta SndEnvPtr
|
|
lda SndEnvFrqPtrHi,y
|
|
sta SndEnvPtr+1
|
|
|
|
dec SndEnvFrqCnt,x
|
|
_IFMI
|
|
dec SndEnvFrqParts,x
|
|
_IFMI
|
|
lda SndEnvFrqLoop,x
|
|
_IFNE
|
|
tay
|
|
lda SndEnvFrqParts2,x
|
|
sta SndEnvFrqParts,x
|
|
bra frq1f
|
|
_ELSE
|
|
tya
|
|
ora #$80
|
|
sta SndEnvFrq,x
|
|
_ENDIF
|
|
_ELSE
|
|
ldy SndEnvFrqOff,x
|
|
frq1f: lda (SndEnvPtr),y
|
|
sta SndEnvFrqCnt,x
|
|
iny
|
|
lda (SndEnvPtr),y
|
|
eor #$ff
|
|
ina
|
|
sta SndEnvFrqInc,x
|
|
iny
|
|
tya
|
|
sta SndEnvFrqOff,x
|
|
_ENDIF
|
|
rts
|
|
_ENDIF
|
|
ldy SndOffsets,x
|
|
clc
|
|
lda SndEnvFrqInc,x
|
|
_IFEQ
|
|
rts
|
|
_ENDIF
|
|
|
|
_IFMI
|
|
adc SndChannel+4,y
|
|
_IFPL
|
|
pha
|
|
lda SndChannel+5,y
|
|
_IFNE
|
|
dea
|
|
sta SndChannel+5,y
|
|
pla
|
|
eor #128
|
|
_ELSE
|
|
pla
|
|
pha
|
|
clc
|
|
adc SndEnvFrqInc,x
|
|
pla
|
|
_ENDIF
|
|
_ELSE
|
|
pha
|
|
lda SndChannel+5,y
|
|
_IFEQ
|
|
pla
|
|
sta SndChannel+4,y
|
|
rts
|
|
_ENDIF
|
|
pla
|
|
_ENDIF
|
|
_ELSE
|
|
adc SndChannel+4,y
|
|
_IFPL
|
|
pha
|
|
lda SndChannel+5,y
|
|
cmp #6
|
|
_IFNE
|
|
ina
|
|
sta SndChannel+5,y
|
|
pla
|
|
eor #128
|
|
_ELSE
|
|
lda SndChannel+4,y
|
|
_IFMI
|
|
pla
|
|
rts
|
|
_ENDIF
|
|
pla
|
|
_ENDIF
|
|
_ELSE
|
|
pha
|
|
lda SndChannel+5,y
|
|
cmp #6
|
|
_IFEQ
|
|
lda SndChannel+4,y
|
|
_IFPL
|
|
pla
|
|
rts
|
|
_ENDIF
|
|
_ENDIF
|
|
pla
|
|
_ENDIF
|
|
_ENDIF
|
|
sta SndChannel+4,y
|
|
|
|
ora #1 ;; if already -1 -> no effect
|
|
rts
|
|
|
|
SndChangeWave:
|
|
tay
|
|
;; Ab hier x Kanal 0-3, y Environment
|
|
_IFMI
|
|
wav99: rts
|
|
_ENDIF
|
|
lda SndNotePlaying,x
|
|
beq wav99
|
|
|
|
|
|
lda SndEnvWavePtrLo,y
|
|
sta SndEnvPtr
|
|
lda SndEnvWavePtrHi,y
|
|
sta SndEnvPtr+1
|
|
|
|
dec SndEnvWaveCnt,x
|
|
_IFMI
|
|
dec SndEnvWaveParts,x
|
|
_IFMI
|
|
lda SndEnvWaveLoop,x
|
|
_IFNE
|
|
tay
|
|
;; Ab hier x Kanal 0-3, y Offset im Environment
|
|
lda SndEnvWaveParts2,x
|
|
sta SndEnvWaveParts,x
|
|
bra wav1v
|
|
_ELSE
|
|
tya
|
|
ora #$80 ;; beende Env
|
|
sta SndEnvWave,x
|
|
_ENDIF
|
|
_ELSE
|
|
ldy SndEnvWaveOff,x
|
|
;; Ab hier x Kanal 0-3, y Offset im Environment
|
|
wav1v: lda (SndEnvPtr),y
|
|
sta SndEnvWaveCnt,x
|
|
phx
|
|
lda SndOffsets,x
|
|
tax
|
|
;; Ab hier x Kanal (0-3)*8, y Offset im Environment
|
|
|
|
iny
|
|
lda (SndEnvPtr),y
|
|
sta SndChannel+3,x ; Shift LO
|
|
iny
|
|
lda (SndEnvPtr),y
|
|
sta SndChannel+7,x ; Shift HI
|
|
iny
|
|
lda (SndEnvPtr),y
|
|
sta SndChannel+1,x ; Feedback
|
|
iny
|
|
tya
|
|
ply
|
|
;; Ab hier x Kanal (0-3)*8, y Kanal 0-3
|
|
sta SndEnvWaveOff,y
|
|
lda #$FF ; =-1 ;; stop timer to set new values...
|
|
sta SndChannel+2,x
|
|
_ENDIF
|
|
_ENDIF
|
|
rts
|
|
|
|
|
|
SndSetValues:
|
|
ldx #4-1
|
|
set0: ldy SndOffsets,x
|
|
lda SndChannel+2,y
|
|
_IFNE ; flag == 0 => don't set
|
|
|
|
bit #$80
|
|
_IFNE ;
|
|
lda #0
|
|
sta $fd25,y ; stop sound timer
|
|
|
|
lda SndChannel+3,y
|
|
sta $fd23,y ; shifter 1
|
|
;;lda $fd27,y
|
|
;;and #$0F
|
|
;;ora SndChannel+7,y ; shifter 2
|
|
lda SndChannel+7,y ; shifter 2
|
|
sta $fd27,y
|
|
lda SndChannel+1,y
|
|
sta $fd21,y ; feedback
|
|
_ENDIF
|
|
|
|
lda SndChannel,y
|
|
sta $fd20,y ; volume
|
|
lda SndChannel+2,y
|
|
bit #$80
|
|
_IFNE ;
|
|
lda SndChannel+4,y
|
|
sta $fd24,y ; reload
|
|
lda SndChannel+5,y
|
|
ora #%00011000 ;;; #%01011000
|
|
;; and #%00111111
|
|
sta $fd25,y ; re-enable timer
|
|
_ENDIF
|
|
|
|
lda #0
|
|
sta SndChannel+2,y ; clear flag
|
|
_ENDIF
|
|
|
|
dex
|
|
_IFPL
|
|
jmp set0
|
|
_ENDIF
|
|
rts
|
|
|
|
_lynx_snd_play:
|
|
sta ptr1
|
|
stx ptr1+1
|
|
jsr popa
|
|
tax
|
|
lda ptr1
|
|
ldy ptr1+1
|
|
php
|
|
pha
|
|
lda SndActive,x
|
|
_IFNE
|
|
dec SndReqStop,x
|
|
lda #1
|
|
sta SndDelay,x
|
|
start0: lda SndActive,x
|
|
bne start0
|
|
_ENDIF
|
|
bra start1
|
|
SndStartSoundx:
|
|
php
|
|
pha
|
|
start1:
|
|
sei
|
|
pla
|
|
sta SndPtrLo,x
|
|
tya
|
|
sta SndPtrHi,x
|
|
lda #1
|
|
sta SndDelay,x
|
|
stz SndEnvVol,x
|
|
stz SndEnvFrq,x
|
|
stz SndEnvWave,x
|
|
sta SndActive,x
|
|
stz SndReqStop,x
|
|
plp
|
|
rts
|
|
SndStartSound2:
|
|
pha
|
|
lda SndActive,x ; check default
|
|
beq start20 ; inactive => ok
|
|
phx
|
|
ldx #3 ; search free channel
|
|
start21:
|
|
lda SndActive,x
|
|
beq start22 ; found =>
|
|
dex
|
|
bpl start21
|
|
plx ; not found
|
|
dec SndReqStop,x ; stop default-channel
|
|
lda #1
|
|
sta SndDelay,x
|
|
start23:
|
|
lda SndActive,x
|
|
bne start23
|
|
bra start20
|
|
start22:
|
|
pla ; clear stack
|
|
start20:
|
|
pla
|
|
phx
|
|
jsr SndStartSoundx ; launch new sound
|
|
plx
|
|
rts
|
|
|
|
_lynx_snd_stop:
|
|
ldx #3
|
|
lda SndActive,x
|
|
_IFNE
|
|
stop0: dec SndReqStop,x
|
|
lda #1
|
|
sta SndDelay,x
|
|
stop1: lda SndActive,x
|
|
bne stop1
|
|
_ENDIF
|
|
dex
|
|
bpl stop0
|
|
rts
|
|
|
|
_lynx_snd_stop_channel:
|
|
tax
|
|
lda SndActive,x
|
|
_IFNE
|
|
dec SndReqStop,x
|
|
lda #1
|
|
sta SndDelay,x
|
|
stopc1: lda SndActive,x
|
|
bne stopc1
|
|
_ENDIF
|
|
rts
|
|
|
|
_lynx_snd_active:
|
|
ldx #3
|
|
lda #0
|
|
act0: ldy SndActive,x
|
|
_IFNE
|
|
ora SndMask,x
|
|
_ENDIF
|
|
dex
|
|
bpl act0
|
|
rts
|
|
|
|
_lynx_snd_pause:
|
|
php
|
|
sei
|
|
lda STIMCTLA
|
|
sta SndPauseOff1+1
|
|
stz STIMCTLA
|
|
lda MSTEREO
|
|
sta SndPauseOff2+1
|
|
lda #$ff
|
|
sta MSTEREO
|
|
lda #$18
|
|
trb AUD0CTLA
|
|
trb AUD1CTLA
|
|
trb AUD2CTLA
|
|
trb AUD3CTLA
|
|
plp
|
|
rts
|
|
|
|
_lynx_snd_continue:
|
|
php
|
|
sei
|
|
SndPauseOff1:
|
|
lda #0 ; Selbsmodifizierter Code!!!
|
|
sta STIMCTLA
|
|
SndPauseOff2:
|
|
lda #0 ; Selbsmodifizierter Code!!!
|
|
sta MSTEREO
|
|
|
|
lda #$18
|
|
tsb AUD0CTLA
|
|
tsb AUD1CTLA
|
|
tsb AUD2CTLA
|
|
tsb AUD3CTLA
|
|
|
|
plp
|
|
rts
|
|
|
|
.rodata
|
|
|
|
SndMask:
|
|
.byte 1,2,4,8
|
|
|
|
SndPrescaler:
|
|
.byte $00,$06,$06,$06,$06,$05,$05,$05,$05,$05,$05,$05,$04,$04,$04,$04
|
|
.byte $04,$04,$04,$04,$03,$03,$03,$03,$03,$03,$03,$03,$03,$03,$02,$02
|
|
.byte $02,$02,$02,$02,$02,$02,$02,$02,$02,$02,$02,$01,$01,$01,$01,$01
|
|
.byte $01,$01,$01,$01,$01,$01,$01,$01,$01,$01,$01,$01,$01,$01,$00,$00
|
|
.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
|
|
.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
|
|
.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
|
|
.byte $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00
|
|
|
|
SndReload:
|
|
.byte $00,$9A,$96,$8F,$86,$FA,$E5,$D1,$BE,$AC,$9C,$8D,$00,$E8,$D3,$C0
|
|
.byte $AF,$A0,$93,$87,$FA,$E7,$D6,$C6,$B8,$AC,$A1,$96,$8D,$84,$FA,$EB
|
|
.byte $DE,$D2,$C7,$BC,$B3,$AA,$A1,$9A,$93,$8C,$86,$00,$F5,$EB,$E1,$D8
|
|
.byte $CF,$C7,$C0,$B9,$B2,$AB,$A5,$A0,$9A,$95,$90,$8B,$87,$82,$FD,$F5
|
|
.byte $EE,$E7,$E0,$D9,$D3,$CD,$C8,$C2,$BD,$B8,$B3,$AE,$AA,$A5,$A1,$9D
|
|
.byte $99,$96,$92,$8F,$8B,$88,$85,$82,$7F,$7C,$79,$77,$74,$72,$6F,$6D
|
|
.byte $6B,$69,$67,$64,$63,$61,$5F,$5D,$5B,$59,$58,$56,$55,$53,$51,$50
|
|
.byte $4F,$4D,$4C,$4B,$49,$48,$47,$46,$44,$43,$42,$41,$40,$3F,$3E,$3D
|
|
|
|
|
|
|