mirror of
https://github.com/vsariola/sointu.git
synced 2025-07-23 23:44:42 -04:00
71 lines
2.5 KiB
NASM
71 lines
2.5 KiB
NASM
;-------------------------------------------------------------------------------
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; OUT Tick
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;-------------------------------------------------------------------------------
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%if OUT_ID > -1
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SECT_TEXT(suopout)
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EXPORT MANGLE_FUNC(su_op_out,0) ; l r
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mov eax, su_synth_obj + su_synth.left
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%ifdef INCLUDE_STEREO_OUT
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jnc su_op_out_mono
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call su_op_out_mono
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add eax, 4
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su_op_out_mono:
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%endif
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fmul dword [edx+su_out_ports.gain] ; g*l
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fadd dword [eax] ; g*l+o
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fstp dword [eax] ; o'=g*l+o
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ret
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%endif ; SU_OUT_ID > -1
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;-------------------------------------------------------------------------------
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; Send Tick
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;-------------------------------------------------------------------------------
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; Input: WRK : pointer to unit workspace
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; VAL : pointer to unit values as bytes
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; ecx : pointer to global workspace
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; st0 : signal
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; Output: (st0) : signal, unless popped
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; Dirty: eax, edx
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;-------------------------------------------------------------------------------
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%if SEND_ID > -1
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SECT_TEXT(susend)
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EXPORT MANGLE_FUNC(su_op_send,0)
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lodsw
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%ifdef INCLUDE_STEREO_SEND
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jnc su_op_send_mono
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mov edi, eax
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inc eax ; send the right channel first
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fxch ; r l
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call su_op_send_mono ; (r) l
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mov eax, edi ; move back to original address
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test eax, SEND_POP ; if r was not popped and is still in the stack
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jnz su_op_send_mono
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fxch ; swap them back: l r
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su_op_send_mono:
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%endif
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%ifdef INCLUDE_GLOBAL_SEND
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test eax, SEND_GLOBAL
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jz su_op_send_skipglobal
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mov ecx, su_synth_obj - su_unit.size
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su_op_send_skipglobal:
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%endif
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test eax, SEND_POP ; if the SEND_POP bit is not set
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jnz su_op_send_skippush
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fld st0 ; duplicate the signal on stack: s s
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su_op_send_skippush: ; there is signal s, but maybe also another: s (s)
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fld dword [edx+su_send_ports.amount] ; a l (l)
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fsub dword [c_0_5] ; a-.5 l (l)
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fadd st0 ; g=2*a-1 l (l)
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and eax, 0x0000ffff - SEND_POP - SEND_GLOBAL ; eax = send address
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fmulp st1, st0 ; g*l (l)
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fadd dword [ecx+su_unit.size+eax*4] ; g*l+L (l),where L is the current value
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fstp dword [ecx+su_unit.size+eax*4] ; (l)
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ret
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%endif ; SU_USE_SEND > -1
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