mirror of
https://github.com/ZDoom/raze-gles.git
synced 2024-11-11 15:21:48 +00:00
230 lines
5.5 KiB
NASM
230 lines
5.5 KiB
NASM
;Copyright (C) 1994-1995 Apogee Software, Ltd.
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;
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;This program is free software; you can redistribute it and/or
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;modify it under the terms of the GNU General Public License
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;as published by the Free Software Foundation; either version 2
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;of the License, or (at your option) any later version.
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;
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;This program is distributed in the hope that it will be useful,
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;but WITHOUT ANY WARRANTY; without even the implied warranty of
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;MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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;
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;See the GNU General Public License for more details.
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;
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;You should have received a copy of the GNU General Public License
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;along with this program; if not, write to the Free Software
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;Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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;
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;Modifications for JonoF's port by Jonathon Fowler (jonof@edgenetwk.com)
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CPU 386
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SECTION .data
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%ifdef UNDERSCORES
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%define MV_16BitReverb _MV_16BitReverb
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%define MV_8BitReverb _MV_8BitReverb
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%define MV_16BitReverbFast _MV_16BitReverbFast
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%define MV_8BitReverbFast _MV_8BitReverbFast
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%endif
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GLOBAL MV_16BitReverb
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GLOBAL MV_8BitReverb
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GLOBAL MV_16BitReverbFast
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GLOBAL MV_8BitReverbFast
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%define OFFSET
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;================
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;
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; MV_16BitReverb
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;
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;================
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; eax - source position
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; edx - destination position
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; ebx - Volume table
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; ecx - number of samples
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ALIGN 4
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MV_16BitReverb:
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pushad
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mov eax, dword [esp + 0*4 + 9*4]
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mov edx, dword [esp + 1*4 + 9*4]
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mov ebx, dword [esp + 2*4 + 9*4]
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mov ecx, dword [esp + 3*4 + 9*4]
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mov esi, eax
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lea edi, [edx - 2]
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ALIGN 4
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rev16loop:
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movzx eax, word [esi] ; get sample
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add edi, 2
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movzx edx, ah
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sub ah, ah
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movsx eax, byte [2*eax+ebx+1] ; volume translate low byte of sample
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xor edx, 80h
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movsx edx, word [2*edx+ebx] ; volume translate high byte of sample
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add esi, 2
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lea eax, [ eax + edx + 80h ] ; mix high byte of sample
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dec ecx ; decrement count
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mov word [edi], ax ; write new sample to destination
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jnz rev16loop ; loop
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popad
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ret
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;================
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;
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; MV_8BitReverb
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;
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;================
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; eax - source position
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; edx - destination position
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; ebx - Volume table
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; ecx - number of samples
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ALIGN 4
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MV_8BitReverb:
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pushad
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mov eax, dword [esp + 0*4 + 9*4]
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mov edx, dword [esp + 1*4 + 9*4]
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mov ebx, dword [esp + 2*4 + 9*4]
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mov ecx, dword [esp + 3*4 + 9*4]
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mov esi, eax
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lea edi, [edx - 1]
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xor eax, eax
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ALIGN 4
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rev8loop:
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; movzx eax, byte ptr [esi] ; get sample
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mov al, byte [esi] ; get sample
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inc edi
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; movsx eax, byte ptr [2*eax+ebx] ; volume translate sample
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mov al, byte [2*eax+ebx] ; volume translate sample
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inc esi
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; add eax, 80h
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add al, 80h
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dec ecx ; decrement count
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mov byte [edi], al ; write new sample to destination
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jnz rev8loop ; loop
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popad
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ret
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;================
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;
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; MV_16BitReverbFast
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;
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;================
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; eax - source position
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; edx - destination position
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; ebx - number of samples
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; ecx - shift
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ALIGN 4
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MV_16BitReverbFast:
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pushad
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mov eax, dword [esp + 0*4 + 9*4]
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mov edx, dword [esp + 1*4 + 9*4]
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mov ebx, dword [esp + 2*4 + 9*4]
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mov ecx, dword [esp + 3*4 + 9*4]
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mov esi, eax
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mov eax,OFFSET rpatch16+3
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mov byte [eax],cl
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lea edi, [edx - 2]
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ALIGN 4
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frev16loop:
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mov ax, word [esi] ; get sample
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add edi, 2
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rpatch16:
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sar ax, 5 ;;;;Add 1 before shift
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add esi, 2
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mov word [edi], ax ; write new sample to destination
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dec ebx ; decrement count
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jnz frev16loop ; loop
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popad
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ret
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;================
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;
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; MV_8BitReverbFast
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;
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;================
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; eax - source position
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; edx - destination position
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; ebx - number of samples
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; ecx - shift
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ALIGN 4
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MV_8BitReverbFast:
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pushad
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mov eax, dword [esp + 0*4 + 9*4]
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mov edx, dword [esp + 1*4 + 9*4]
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mov ebx, dword [esp + 2*4 + 9*4]
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mov ecx, dword [esp + 3*4 + 9*4]
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mov esi, eax
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mov eax,OFFSET rpatch8+2
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mov edi, edx
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mov edx, 80h
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mov byte [eax],cl
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mov eax, 80h
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shr eax, cl
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dec edi
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sub edx, eax
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ALIGN 4
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frev8loop:
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mov al, byte [esi] ; get sample
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inc esi
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mov ecx, eax
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inc edi
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rpatch8:
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shr eax, 3
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xor ecx, 80h ; flip the sign bit
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shr ecx, 7 ; shift the sign down to 1
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add eax, edx
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add eax, ecx ; add sign bit to round to 0
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dec ebx ; decrement count
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mov byte [edi], al ; write new sample to destination
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jnz frev8loop ; loop
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popad
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ret
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