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ReC98/th02/snd/detmode.asm

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Make all sound functions and variables available to C
2015-02-23 10:47:22 +00:00
; void DEFCONV snd_determine_mode()
proc_defconv snd_determine_mode
[Reverse-engineering] Sound mode determination Note how it's only one *mode* in TH02/TH03, but two *modes* in TH04/TH05, since you can't select between FM and Beep sound effect modes in TH02/TH03 (or even disable sounds altogether). Might be a bit confusing, but it seemed appropriate enough to distinguish the two functions.
2014-11-28 23:56:26 +00:00
mov ah, PMD_GET_DRIVER_VERSION
int 60h
xor bx, bx
cmp al, -1
jz short @@set_to_MIDI_activity
inc bx
Make all sound functions and variables available to C
2015-02-23 10:47:22 +00:00
mov _snd_fm_possible, 1
[Reverse-engineering] Sound mode determination Note how it's only one *mode* in TH02/TH03, but two *modes* in TH04/TH05, since you can't select between FM and Beep sound effect modes in TH02/TH03 (or even disable sounds altogether). Might be a bit confusing, but it seemed appropriate enough to distinguish the two functions.
2014-11-28 23:56:26 +00:00
jmp short @@set_and_ret
@@set_to_MIDI_activity:
Make all sound functions and variables available to C
2015-02-23 10:47:22 +00:00
mov bl, _snd_midi_active
[Reverse-engineering] Sound mode determination Note how it's only one *mode* in TH02/TH03, but two *modes* in TH04/TH05, since you can't select between FM and Beep sound effect modes in TH02/TH03 (or even disable sounds altogether). Might be a bit confusing, but it seemed appropriate enough to distinguish the two functions.
2014-11-28 23:56:26 +00:00
@@set_and_ret:
Make all sound functions and variables available to C
2015-02-23 10:47:22 +00:00
mov _snd_active, bl
[Reverse-engineering] Sound mode determination Note how it's only one *mode* in TH02/TH03, but two *modes* in TH04/TH05, since you can't select between FM and Beep sound effect modes in TH02/TH03 (or even disable sounds altogether). Might be a bit confusing, but it seemed appropriate enough to distinguish the two functions.
2014-11-28 23:56:26 +00:00
mov ax, bx
ret
Make all sound functions and variables available to C
2015-02-23 10:47:22 +00:00
endp_defconv
[Reverse-engineering] Sound mode determination Note how it's only one *mode* in TH02/TH03, but two *modes* in TH04/TH05, since you can't select between FM and Beep sound effect modes in TH02/TH03 (or even disable sounds altogether). Might be a bit confusing, but it seemed appropriate enough to distinguish the two functions.
2014-11-28 23:56:26 +00:00
nop ; word alignment