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chiptune_player: split off bigchunk setup

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This commit is contained in:
Vince Weaver 2018-02-21 23:06:02 -05:00
parent 6f13857beb
commit 8d46476a53
1 changed files with 24 additions and 8 deletions
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32
chiptune_player/chiptune_player.s
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@ -123,6 +123,13 @@ mockingboard_found:
jsr new_song
lda #<CHUNK_BUFFER ; set input pointer
sta INL
lda #>CHUNK_BUFFER
sta INH
;============================
; Enable 6502 interrupts
;============================
@ -447,13 +454,27 @@ bloop3:
adc #0
sta LZ4_SRC+1
lda (LZ4_SRC),Y
jsr next_subsong
; should tail call
rts
;=================
; next sub-song
;=================
next_subsong:
ldy #0
lda (LZ4_SRC),Y ; get next size value
sta LZ4_END
iny
lda (LZ4_SRC),Y
sta LZ4_END+1
lda #2
lda #2 ; increment pointer
clc
adc LZ4_SRC
sta LZ4_SRC
@ -461,12 +482,7 @@ bloop3:
adc #0
sta LZ4_SRC+1
jsr lz4_decode
lda #<CHUNK_BUFFER
sta INL
lda #>CHUNK_BUFFER
sta INH
jsr lz4_decode ; decode
rts