raze-gles/polymer/eduke32/source/jaudiolib/mvreverb.nasm

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;Copyright (C) 1994-1995 Apogee Software, Ltd.
;
;This program is free software; you can redistribute it and/or
;modify it under the terms of the GNU General Public License
;as published by the Free Software Foundation; either version 2
;of the License, or (at your option) any later version.
;
;This program is distributed in the hope that it will be useful,
;but WITHOUT ANY WARRANTY; without even the implied warranty of
;MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
;
;See the GNU General Public License for more details.
;
;You should have received a copy of the GNU General Public License
;along with this program; if not, write to the Free Software
;Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
;
;Modifications for JonoF's port by Jonathon Fowler (jonof@edgenetwk.com)
CPU 386
SECTION .data
%ifdef UNDERSCORES
%define MV_16BitReverb _MV_16BitReverb
%define MV_8BitReverb _MV_8BitReverb
%define MV_16BitReverbFast _MV_16BitReverbFast
%define MV_8BitReverbFast _MV_8BitReverbFast
%endif
GLOBAL MV_16BitReverb
GLOBAL MV_8BitReverb
GLOBAL MV_16BitReverbFast
GLOBAL MV_8BitReverbFast
%define OFFSET
;================
;
; MV_16BitReverb
;
;================
; eax - source position
; edx - destination position
; ebx - Volume table
; ecx - number of samples
ALIGN 4
MV_16BitReverb:
pushad
mov eax, dword [esp + 0*4 + 9*4]
mov edx, dword [esp + 1*4 + 9*4]
mov ebx, dword [esp + 2*4 + 9*4]
mov ecx, dword [esp + 3*4 + 9*4]
mov esi, eax
lea edi, [edx - 2]
ALIGN 4
rev16loop:
movzx eax, word [esi] ; get sample
add edi, 2
movzx edx, ah
sub ah, ah
movsx eax, byte [2*eax+ebx+1] ; volume translate low byte of sample
xor edx, 80h
movsx edx, word [2*edx+ebx] ; volume translate high byte of sample
add esi, 2
lea eax, [ eax + edx + 80h ] ; mix high byte of sample
dec ecx ; decrement count
mov word [edi], ax ; write new sample to destination
jnz rev16loop ; loop
popad
ret
;================
;
; MV_8BitReverb
;
;================
; eax - source position
; edx - destination position
; ebx - Volume table
; ecx - number of samples
ALIGN 4
MV_8BitReverb:
pushad
mov eax, dword [esp + 0*4 + 9*4]
mov edx, dword [esp + 1*4 + 9*4]
mov ebx, dword [esp + 2*4 + 9*4]
mov ecx, dword [esp + 3*4 + 9*4]
mov esi, eax
lea edi, [edx - 1]
xor eax, eax
ALIGN 4
rev8loop:
; movzx eax, byte ptr [esi] ; get sample
mov al, byte [esi] ; get sample
inc edi
; movsx eax, byte ptr [2*eax+ebx] ; volume translate sample
mov al, byte [2*eax+ebx] ; volume translate sample
inc esi
; add eax, 80h
add al, 80h
dec ecx ; decrement count
mov byte [edi], al ; write new sample to destination
jnz rev8loop ; loop
popad
ret
;================
;
; MV_16BitReverbFast
;
;================
; eax - source position
; edx - destination position
; ebx - number of samples
; ecx - shift
ALIGN 4
MV_16BitReverbFast:
pushad
mov eax, dword [esp + 0*4 + 9*4]
mov edx, dword [esp + 1*4 + 9*4]
mov ebx, dword [esp + 2*4 + 9*4]
mov ecx, dword [esp + 3*4 + 9*4]
mov esi, eax
mov eax,OFFSET rpatch16+3
mov byte [eax],cl
lea edi, [edx - 2]
ALIGN 4
frev16loop:
mov ax, word [esi] ; get sample
add edi, 2
rpatch16:
sar ax, 5 ;;;;Add 1 before shift
add esi, 2
mov word [edi], ax ; write new sample to destination
dec ebx ; decrement count
jnz frev16loop ; loop
popad
ret
;================
;
; MV_8BitReverbFast
;
;================
; eax - source position
; edx - destination position
; ebx - number of samples
; ecx - shift
ALIGN 4
MV_8BitReverbFast:
pushad
mov eax, dword [esp + 0*4 + 9*4]
mov edx, dword [esp + 1*4 + 9*4]
mov ebx, dword [esp + 2*4 + 9*4]
mov ecx, dword [esp + 3*4 + 9*4]
mov esi, eax
mov eax,OFFSET rpatch8+2
mov edi, edx
mov edx, 80h
mov byte [eax],cl
mov eax, 80h
shr eax, cl
dec edi
sub edx, eax
ALIGN 4
frev8loop:
mov al, byte [esi] ; get sample
inc esi
mov ecx, eax
inc edi
rpatch8:
shr eax, 3
xor ecx, 80h ; flip the sign bit
shr ecx, 7 ; shift the sign down to 1
add eax, edx
add eax, ecx ; add sign bit to round to 0
dec ebx ; decrement count
mov byte [edi], al ; write new sample to destination
jnz frev8loop ; loop
popad
ret