mirror of
https://github.com/irmen/prog8.git
synced 2024-11-23 22:33:12 +00:00
82 lines
3.2 KiB
Lua
82 lines
3.2 KiB
Lua
%import textio
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%import cx16diskio
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%import palette
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%zeropage basicsafe
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%zpreserved $22,$28 ; zsound lib uses this region
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;; Proof Of Concept ZSM player using a binary blob version of zsound library by ZeroByte relocated to something usable here.
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; "issues":
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; - prog8 (or rather, 64tass) cannot "link" other assembly object files so we have to incbin a binary blob.
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; - zsound player ZP usage is only known after compilation of zsound lib. And then this has to be blocked off in the prog8 program.
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; - zsound lib BSS section has to be expanded into real zeros as part of the included binary.
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; - zsound binary starts with 2 byte prg header that shifts the jump table 2 bytes (not a big issue but a bit untidy)
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; - 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)
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; - prog8 always has some bootstrap code after the basic launcher so we can only start loading stuff after that
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; - 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.
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main $0830 {
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zsound_lib:
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; this has to be the first statement to make sure it loads at the specified module address $0830
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%asmbinary "zsmplayer-0830.bin"
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; note: jump table is offset by 2 from the load address (because of prg header)
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romsub $0832 = zsm_init() clobbers(A)
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romsub $0835 = zsm_play() clobbers(A, X, Y)
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romsub $0838 = zsm_playIRQ() clobbers(A, X, Y)
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romsub $083b = zsm_start(ubyte bank @A, uword song_address @XY) clobbers(A, X, Y) -> ubyte @Pc
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romsub $083e = zsm_stop()
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romsub $0841 = zsm_setspeed(uword hz @XY) clobbers(A, X, Y)
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romsub $0844 = zsm_setloop(ubyte count @A)
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romsub $0847 = zsm_forceloop(ubyte count @A)
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romsub $084a = zsm_noloop()
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romsub $084d = zsm_setcallback(uword address @XY)
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romsub $0850 = zsm_clearcallback() clobbers(A)
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romsub $0853 = zsm_get_music_speed() clobbers(A) -> uword @XY
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const ubyte song_bank = 4
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const uword song_address = $a000
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sub start() {
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txt.print("zsound demo program!\n")
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if not cx16diskio.load_raw(8, "colony.zsm", song_bank, song_address) {
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txt.print("?can't load song\n")
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return
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}
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cx16.rambank(song_bank)
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zsm_init()
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zsm_setcallback(&end_of_song_cb)
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if zsm_start(song_bank, song_address)==0 {
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txt.print("music speed: ")
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txt.print_uw(zsm_get_music_speed())
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txt.print(" hz\nplaying song! hit enter to stop.\n")
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; for IRQ based playback instead: cx16.set_irq(&zsm_playIRQ, true)
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while cx16.joystick_get2(0)==$ffff {
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sys.waitvsync()
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repeat 800 {
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; artificially delay calling the play routine so we can see its raster time
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%asm {{
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nop
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}}
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}
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palette.set_color(0, $0c5)
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zsm_play()
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palette.set_color(0, $000)
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}
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zsm_stop()
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} else {
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txt.print("?song start error\n")
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}
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}
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sub end_of_song_cb() {
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txt.print("end of song!\n")
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}
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}
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