51 lines
852 B
ArmAsm
51 lines
852 B
ArmAsm
|
|
|
|
load_music:
|
|
|
|
lda LOAD_NEXT_CHUNK ; see if we need to load next chunk
|
|
beq no_load_chunk ; outside IRQ to avoid glitch in music
|
|
|
|
jsr load_song_chunk
|
|
|
|
lda #0 ; reset
|
|
sta LOAD_NEXT_CHUNK
|
|
|
|
no_load_chunk:
|
|
rts
|
|
|
|
|
|
|
|
;========================
|
|
; load song chunk
|
|
; CURRENT_CHUNK is which one, 0..N
|
|
; CHUNK_DEST is $D0 or $E8
|
|
|
|
load_song_chunk:
|
|
ldx CURRENT_CHUNK
|
|
|
|
chunk_l_smc:
|
|
lda $DDDD,X
|
|
sta getsrc_smc+1 ; LZSA_SRC_LO
|
|
chunk_h_smc:
|
|
lda $DDDD,X
|
|
sta getsrc_smc+2 ; LZSA_SRC_HI
|
|
bne load_song_chunk_good
|
|
|
|
; $00 in chunk table means we are off the end, so wrap
|
|
; lda #$00
|
|
sta CURRENT_CHUNK ; reset chunk to 0
|
|
beq load_song_chunk ; try again
|
|
|
|
load_song_chunk_good:
|
|
lda CHUNK_NEXT_LOAD ; decompress to $D0 or $E8
|
|
|
|
jsr decompress_lzsa2_fast
|
|
|
|
|
|
lda CHUNK_NEXT_LOAD ; point to next location
|
|
eor #$38
|
|
sta CHUNK_NEXT_LOAD
|
|
|
|
rts
|
|
|