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LightSpeedPlayer.asm
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;*****************************************************************
;
; Light Speed Player v1.20
; Fastest Amiga MOD player ever :)
; Written By Arnaud Carré (aka Leonard / OXYGENE)
; https://github.com/arnaud-carre/LSPlayer
; twitter: @leonard_coder
;
; "small & fast" standard player version ( average time: 1 scanline )
; Less than 512 bytes of code!
;
; You can also use "micro" mode for tiny disk footprint 4KiB demo ("-micro" option)
; Or you can use generated "ultra fast" player code for half scanline replayer ("-insane" option)
;
; LSP_MusicInit Initialize a LSP driver + relocate score&bank music data
; LSP_MusicPlayTick Play a LSP music (call it per frame)
; LSP_MusicGetPos Get mod seq pos (see -getpos option in LSPConvert)
; LSP_MusicSetPos Set mod seq pos (see -setpos option in LSPConvert)
;
;*****************************************************************
;------------------------------------------------------------------
;
; LSP_MusicInit
;
; In: a0: LSP music data(any memory)
; a1: LSP sound bank(chip memory)
; a2: DMACON patching value low byte address (should be odd address!)
; Out:a0: music BPM pointer (16bits)
; d0: music len in tick count
;
;------------------------------------------------------------------
LSP_MusicInit:
cmpi.l #'LSP1',(a0)+
bne .dataError
move.l (a0)+,d0 ; unique id
cmp.l (a1),d0 ; check sample bank matches the lsmusic file
bne .dataError
lea LSP_State(pc),a3
move.l a2,m_dmaconPatch(a3)
move.w #$8000,-1(a2) ; Be sure DMACon word is $8000 (note: a2 should be ODD address)
cmpi.w #$010b,(a0)+ ; this play routine supports v1.11 as minimal version of LPConvert.exe
blt .dataError
movea.l a0,a4 ; relocation flag ad
addq.w #2,a0 ; skip relocation flag
move.w (a0)+,m_currentBpm(a3) ; default BPM
move.w (a0)+,m_escCodeRewind(a3)
move.w (a0)+,m_escCodeSetBpm(a3)
move.w (a0)+,m_escCodeGetPos(a3)
move.l (a0)+,-(a7) ; music len in frame ticks
move.w (a0)+,d0 ; instrument count
lea -12(a0),a2 ; LSP data has -12 offset on instrument tab ( to win 2 cycles in insane player :) )
move.l a2,m_lspInstruments(a3) ; instrument tab addr ( minus 4 )
subq.w #1,d0
move.l a1,d1
movea.l a0,a1 ; keep relocated flag
.relocLoop: tst.b (a4) ; relocation guard
bne.s .relocated
add.l d1,(a0)
add.l d1,6(a0)
.relocated: lea 12(a0),a0
dbf d0,.relocLoop
move.w (a0)+,d0 ; codes table size
move.l a0,m_codeTableAddr(a3) ; code table
add.w d0,d0
add.w d0,a0
; read sequence timing infos (if any)
move.w (a0)+,m_seqCount(a3)
beq.s .noSeq
move.l a0,m_seqTable(a3)
clr.w m_currentSeq(a3)
move.w m_seqCount(a3),d0
moveq #0,d1
move.w d0,d1
lsl.w #3,d1 ; 8 bytes per entry
add.w #12,d1 ; add 3 last 32bits (word stream size, byte stream loop, word stream loop)
add.l a0,d1 ; word stream data address
subq.w #1,d0
.seqRel: tst.b (a4)
bne.s .skipRel
add.l d1,(a0)
add.l d1,4(a0)
.skipRel: addq.w #8,a0
dbf d0,.seqRel
.noSeq: movem.l (a0)+,d0-d2 ; word stream size, byte stream loop point, word stream loop point
st (a4) ; mark this music score as "relocated"
move.l a0,m_wordStream(a3)
lea 0(a0,d0.l),a1 ; byte stream
move.l a1,m_byteStream(a3)
add.l d2,a0
add.l d1,a1
move.l a0,m_wordStreamLoop(a3)
move.l a1,m_byteStreamLoop(a3)
bset.b #1,$bfe001 ; disabling this fucking Low pass filter!!
lea m_currentBpm(a3),a0
move.l (a7)+,d0 ; music len in frame ticks
rts
.dataError: illegal
;------------------------------------------------------------------
;
; LSP_MusicPlayTick
;
; In: a6: should be $dff0a0
; Scratched regs: d0/d1/d2/a0/a1/a2/a3/a4/a5
; Out:None
;
;------------------------------------------------------------------
LSP_MusicPlayTick:
lea LSP_State(pc),a1
move.l (a1),a0 ; byte stream
move.l m_codeTableAddr(a1),a2 ; code table
.process: moveq #0,d0
.cloop: move.b (a0)+,d0
beq .cextended
add.w d0,d0
move.w 0(a2,d0.w),d0 ; code
beq .noInst
.cmdExec: add.b d0,d0
bcc.s .noVd
move.b (a0)+,$d9-$a0(a6)
.noVd: add.b d0,d0
bcc.s .noVc
move.b (a0)+,$c9-$a0(a6)
.noVc: add.b d0,d0
bcc.s .noVb
move.b (a0)+,$b9-$a0(a6)
.noVb: add.b d0,d0
bcc.s .noVa
move.b (a0)+,$a9-$a0(a6)
.noVa:
move.l a0,(a1)+ ; store byte stream ptr
move.l (a1),a0 ; word stream
tst.b d0
beq.s .noPa
add.b d0,d0
bcc.s .noPd
move.w (a0)+,$d6-$a0(a6)
.noPd: add.b d0,d0
bcc.s .noPc
move.w (a0)+,$c6-$a0(a6)
.noPc: add.b d0,d0
bcc.s .noPb
move.w (a0)+,$b6-$a0(a6)
.noPb: add.b d0,d0
bcc.s .noPa
move.w (a0)+,$a6-$a0(a6)
.noPa:
tst.w d0
beq.s .noInst
moveq #0,d1
move.l m_lspInstruments-4(a1),a2 ; instrument table
lea .resetv+12(pc),a4
lea 3*16(a6),a5
moveq #4-1,d2
.vloop: add.w d0,d0
bcs.s .setIns
add.w d0,d0
bcc.s .skip
move.l (a4),a3
move.l (a3)+,(a5)
move.w (a3)+,4(a5)
bra.s .skip
.setIns: add.w (a0)+,a2
add.w d0,d0
bcc.s .noReset
bset d2,d1
move.w d1,$96-$a0(a6)
.noReset: move.l (a2)+,(a5)
move.w (a2)+,4(a5)
move.l a2,(a4)
.skip: subq.w #4,a4
lea -16(a5),a5
dbf d2,.vloop
move.l m_dmaconPatch-4(a1),a3 ; dmacon patch
move.b d1,(a3) ; dmacon
.noInst: move.l a0,(a1) ; store word stream (or byte stream if coming from early out)
rts
.cextended: addi.w #$100,d0
move.b (a0)+,d0
beq.s .cextended
add.w d0,d0
move.w 0(a2,d0.w),d0 ; code
cmp.w m_escCodeRewind(a1),d0
beq.s .r_rewind
cmp.w m_escCodeSetBpm(a1),d0
beq.s .r_chgbpm
cmp.w m_escCodeGetPos(a1),d0
bne .cmdExec
.r_setPos: move.b (a0)+,(m_currentSeq+1)(a1)
bra .process
.r_rewind:
move.l m_byteStreamLoop(a1),a0
move.l m_wordStreamLoop(a1),m_wordStream(a1)
bra .process
.r_chgbpm: move.b (a0)+,(m_currentBpm+1)(a1) ; BPM
bra .process
.resetv: dc.l 0,0,0,0
;------------------------------------------------------------------
;
; LSP_MusicSetPos
;
; In: d0: seq position (from 0 to last seq of the song)
; Out:None
;
; Force the replay pointer to a seq position. If music wasn't converted
; using -setpos option, this func does nothing
;
;------------------------------------------------------------------
LSP_MusicSetPos:
lea LSP_State(pc),a3
move.w m_seqCount(a3),d1
beq.s .noTimingInfo
cmp.w d1,d0
bge.s .noTimingInfo
move.w d0,m_currentSeq(a3)
move.l m_seqTable(a3),a0
lsl.w #3,d0
add.w d0,a0
move.l (a0)+,m_wordStream(a3)
move.l (a0)+,m_byteStream(a3)
.noTimingInfo:
rts
;------------------------------------------------------------------
;
; LSP_MusicGetPos
;
; In: None
; Out: d0: seq position (from 0 to last seq of the song)
;
; Get the current seq position. If music wasn't converted with
; -getpos option, this func just returns 0
;
;------------------------------------------------------------------
LSP_MusicGetPos:
move.w (LSP_State+m_currentSeq)(pc),d0
rts
rsreset
m_byteStream: rs.l 1 ; 0 byte stream
m_wordStream: rs.l 1 ; 4 word stream
m_dmaconPatch: rs.l 1 ; 8 m_lfmDmaConPatch
m_codeTableAddr: rs.l 1 ; 12 code table addr
m_escCodeRewind: rs.w 1 ; 16 rewind special escape code
m_escCodeSetBpm: rs.w 1 ; 18 set BPM escape code
m_lspInstruments: rs.l 1 ; 20 LSP instruments table addr
m_relocDone: rs.w 1 ; 24 reloc done flag
m_currentBpm: rs.w 1 ; 26 current BPM
m_byteStreamLoop: rs.l 1 ; 28 byte stream loop point
m_wordStreamLoop: rs.l 1 ; 32 word stream loop point
m_seqCount: rs.w 1
m_seqTable: rs.l 1
m_currentSeq: rs.w 1
m_escCodeGetPos: rs.w 1
sizeof_LSPVars: rs.w 0
LSP_State: ds.b sizeof_LSPVars