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feat(vm): add dbgain unit, where gain is defined in decibels

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Closes #78
This commit is contained in:
5684185+vsariola@users.noreply.github.com
2023-10-23 18:16:31 +03:00
parent f698986718
commit 04fbc9f6a7
12 changed files with 146 additions and 25 deletions
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35
vm/compiler/templates/amd64-386/effects.asm
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@ -98,6 +98,41 @@ su_op_invgain_mono:
{{- end}}
{{end}}
{{- if .HasOp "dbgain"}}
;-------------------------------------------------------------------------------
; DBGAIN opcode: apply gain on the signal, with gain given in decibels
;-------------------------------------------------------------------------------
; Mono: x -> x*g, where g = 2**((2*d-1)*6.643856189774724) i.e. -40dB to 40dB, d=[0..1]
; Stereo: l r -> l*g r*g
;-------------------------------------------------------------------------------
{{.Func "su_op_dbgain" "Opcode"}}
{{- if .Stereo "dbgain"}}
fld dword [{{.Input "dbgain" "decibels"}}] ; d l r
{{- .Prepare (.Float 0.5)}}
fsub dword [{{.Use (.Float 0.5)}}] ; d-.5
fadd st0, st0 ; 2*d-1
{{- .Prepare (.Float 6.643856189774724)}}
fmul dword [{{.Use (.Float 6.643856189774724)}}] ; (2*d-1)*6.643856189774724
{{.Call "su_power"}}
{{- if .Mono "dbgain"}}
jnc su_op_dbgain_mono
{{- end}}
fmul st2, st0 ; g l r/g
su_op_dbgain_mono:
fmulp st1, st0 ; l/g (r/)
ret
{{- else}}
fld dword [{{.Input "dbgain" "decibels"}}] ; d l
{{- .Prepare (.Float 0.5)}}
fsub dword [{{.Use (.Float 0.5)}}] ; d-.5
fadd st0, st0 ; 2*d-1
{{- .Prepare (.Float 6.643856189774724)}}
fmul dword [{{.Use (.Float 6.643856189774724)}}] ; (2*d-1)*6.643856189774724
{{.Call "su_power"}}
fmulp st1, st0
ret
{{- end}}
{{end}}
{{- if .HasOp "filter"}}
;-------------------------------------------------------------------------------