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Improve comments for UpdateInstrument

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This commit is contained in:
Veikko Sariola 2020-05-04 20:19:58 +03:00
parent 6be7959cd1
commit 5c1b87f254
1 changed files with 15 additions and 10 deletions
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25
src/4klang.asm
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@ -1202,6 +1202,11 @@ go4kACC_func_loop:
;-------------------------------------------------------------------------------
; Update Instrument (allocate voices, set voice to release)
;-------------------------------------------------------------------------------
; Input: [esp+8] : current tick
; ecx : instrument number
; edi : pointer to the instrument struct of first voice
; Dirty: eax,edx
;-------------------------------------------------------------------------------
SECT_TEXT(g4kcodw)
go4kUpdateInstrument:
@ -1225,20 +1230,20 @@ go4kUpdateInstrument:
jl short go4kUpdateInstrument_done
%if MAX_VOICES > 1
pushad
xchg eax, dword [go4k_voiceindex + ecx*4]
test eax, eax
je go4kUpdateInstrument_newNote
add edi, go4k_instrument.size
go4kUpdateInstrument_newNote:
xor al,1
xchg dword [go4k_voiceindex + ecx*4], eax
xchg eax, dword [go4k_voiceindex + ecx*4] ; eax = current voice index
test eax, eax ; if (eax == 0)
je go4kUpdateInstrument_newNote ; goto newnote
add edi, go4k_instrument.size ; move edi to point to second voice
go4kUpdateInstrument_newNote: ; newnote:
xor al,1 ; current voice = 1 - current voice
xchg dword [go4k_voiceindex + ecx*4], eax ; save current voice
%endif
pushad
xor eax, eax
mov ecx, (8+MAX_UNITS*MAX_UNIT_SLOTS*4)/4 ; // clear only relase, note and workspace
rep stosd
mov ecx, (8+MAX_UNITS*MAX_UNIT_SLOTS*4)/4 ; clear relase, note and workspace
rep stosd ; but don't clear output signals
popad
mov dword [edi+4], edx ; // set requested note as current note
mov dword [edi+4], edx ; set go4k_instrument.note as current note
%if MAX_VOICES > 1
popad
%endif