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some notes added to zsound demo player

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Irmen de Jong 2022-06-09 23:36:07 +02:00
parent 710f27afa9
commit fd13bd864e
1 changed files with 9 additions and 3 deletions
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12
examples/cx16/zsound/demoplayer.p8
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@ -6,9 +6,17 @@
;; Proof Of Concept ZSM player using a binary blob version of zsound library by ZeroByte relocated to something usable here.
; "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 {
; TODO: don't like to have *main* at a set start address, but otherwise the compiler puts it at the front, overwriting another module that we wanted there
zsound_lib:
; this has to be the first statement to make sure it loads at the specified module address $0830
@ -56,8 +64,6 @@ zsound_lib:
} else {
txt.print("?song start error\n")
}
; TODO set Vera back to sane state?
}
sub end_of_song_cb() {