prog8/examples/cx16/zsound/play-zsound.p8

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%import textio
%import cx16diskio
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%import palette
%zeropage basicsafe
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%zpreserved $22,$2d ; zsound lib uses this region
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;; Proof Of Concept Zsound player using a binary blob version of zsound library by ZeroByte relocated to something usable here.
;; Can play ZSM (music) and ZCM (pcm samples).
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; "issues":
; - prog8 (or rather, 64tass) cannot "link" other assembly object files so we have to incbin a binary blob.
; - zsound player ZP usage is only known after compilation of zsound lib. And then this has to be blocked off in the prog8 program.
; - zsound lib BSS section has to be expanded into real zeros as part of the included binary.
; - zsound binary starts with 2 byte prg header that shifts the jump table 2 bytes (not a big issue but a bit untidy)
; - prog8 always sticks main module at the beginning so can't create a container module to stick zsound in (if you want to load it at the beginning)
; - prog8 always has some bootstrap code after the basic launcher so we can only start loading stuff after that
; - prog8 main has to be set to a fixed address (in this case $0830) to which the special zsound binary has been compiled as well.
main $0830 {
zsound_lib:
; this has to be the first statement to make sure it loads at the specified module address $0830
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%asmbinary "zsound_combo-0830.bin"
; note: jump table is offset by 2 from the load address (because of prg header)
romsub $0832 = zsm_init() clobbers(A)
romsub $0835 = zsm_play() clobbers(A, X, Y)
romsub $0838 = zsm_playIRQ() clobbers(A, X, Y)
romsub $083b = zsm_start(ubyte bank @A, uword song_address @XY) clobbers(A, X, Y) -> ubyte @Pc
romsub $083e = zsm_stop()
romsub $0841 = zsm_setspeed(uword hz @XY) clobbers(A, X, Y)
romsub $0844 = zsm_setloop(ubyte count @A)
romsub $0847 = zsm_forceloop(ubyte count @A)
romsub $084a = zsm_noloop()
romsub $084d = zsm_setcallback(uword address @XY)
romsub $0850 = zsm_clearcallback() clobbers(A)
romsub $0853 = zsm_get_music_speed() clobbers(A) -> uword @XY
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romsub $0856 = pcm_init() clobbers(A)
romsub $0859 = pcm_trigger_digi(ubyte bank @A, uword song_address @XY)
romsub $085c = pcm_play() clobbers(A, X, Y)
romsub $085f = pcm_stop() clobbers(A)
romsub $0862 = pcm_set_volume(ubyte volume @A)
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const ubyte song_bank = 1
const uword song_address = $a000
const ubyte digi_bank = 6
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const uword digi_address = $a000
const ubyte zcm_DIGITAB_size = 8 ; header size
sub start() {
txt.print("zsound demo program!\n")
cbm.SETMSG(%10000000) ; enable kernal status messages for load
if not cx16diskio.load_raw(8, "colony.zsm", song_bank, song_address) {
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txt.print("?can't load\n")
return
}
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if not cx16diskio.load_raw(8, "terminator2.zcm", digi_bank, digi_address) {
txt.print("?can't load\n")
return
} else {
; initialize header pointer of the zcm to point to actual sample data
; this will be set correcly by zsound lib itself if left at zero
; poke(digi_address+2, digi_bank)
; pokew(digi_address, digi_address+zcm_DIGITAB_size)
}
cbm.SETMSG(0)
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txt.nl()
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cx16.rambank(song_bank)
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play_music()
}
sub play_music() {
zsm_init()
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pcm_init()
zsm_setcallback(&end_of_song_cb)
if zsm_start(song_bank, song_address)==0 {
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txt.print("\nmusic speed: ")
txt.print_uw(zsm_get_music_speed())
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txt.print(" hz\nplaying song! hit enter to also play a digi sample!\n")
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repeat {
if cx16.joystick_get2(0)!=$ffff
pcm_trigger_digi(digi_bank, digi_address)
sys.waitvsync()
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repeat 1400 {
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; artificially delay calling the play routine so we can see its raster time
%asm {{
nop
}}
}
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palette.set_color(0, $84c)
pcm_play()
palette.set_color(0, $f25)
zsm_play()
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palette.set_color(0, $000)
}
zsm_stop()
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pcm_stop()
} else {
txt.print("?song start error\n")
}
}
sub end_of_song_cb() {
txt.print("end of song!\n")
}
}