ref: a398442d41ed928c12632909a02fd5f3052b7d27
dir: /Game/src/audiolib/mv_mix.asm/
IDEAL
p386
MODEL flat
dataseg
CODESEG
MASM
ALIGN 4
EXTRN _MV_HarshClipTable:DWORD
EXTRN _MV_MixDestination:DWORD
EXTRN _MV_MixPosition:DWORD
EXTRN _MV_LeftVolume:DWORD
EXTRN _MV_RightVolume:DWORD
EXTRN _MV_SampleSize:DWORD
EXTRN _MV_RightChannelOffset:DWORD
;================
;
; MV_Mix8BitMono
;
;================
; eax - position
; edx - rate
; ebx - start
; ecx - number of samples to mix
PROC MV_Mix8BitMono_
PUBLIC MV_Mix8BitMono_
; Two at once
pushad
mov ebp, eax
mov esi, ebx ; Source pointer
; Sample size
mov ebx, _MV_SampleSize
mov eax,OFFSET apatch7+2 ; convice tasm to modify code...
mov [eax],bl
mov eax,OFFSET apatch8+2 ; convice tasm to modify code...
mov [eax],bl
mov eax,OFFSET apatch9+3 ; convice tasm to modify code...
mov [eax],bl
; Volume table ptr
mov ebx, _MV_LeftVolume ; Since we're mono, use left volume
mov eax,OFFSET apatch1+4 ; convice tasm to modify code...
mov [eax],ebx
mov eax,OFFSET apatch2+4 ; convice tasm to modify code...
mov [eax],ebx
; Harsh Clip table ptr
mov ebx, _MV_HarshClipTable
add ebx, 128
mov eax,OFFSET apatch3+2 ; convice tasm to modify code...
mov [eax],ebx
mov eax,OFFSET apatch4+2 ; convice tasm to modify code...
mov [eax],ebx
; Rate scale ptr
mov eax,OFFSET apatch5+2 ; convice tasm to modify code...
mov [eax],edx
mov eax,OFFSET apatch6+2 ; convice tasm to modify code...
mov [eax],edx
mov edi, _MV_MixDestination ; Get the position to write to
; Number of samples to mix
shr ecx, 1 ; double sample count
cmp ecx, 0
je short exit8m
; eax - scratch
; ebx - scratch
; edx - scratch
; ecx - count
; edi - destination
; esi - source
; ebp - frac pointer
; apatch1 - volume table
; apatch2 - volume table
; apatch3 - harsh clip table
; apatch4 - harsh clip table
; apatch5 - sample rate
; apatch6 - sample rate
mov eax,ebp ; begin calculating first sample
add ebp,edx ; advance frac pointer
shr eax,16 ; finish calculation for first sample
mov ebx,ebp ; begin calculating second sample
add ebp,edx ; advance frac pointer
shr ebx,16 ; finish calculation for second sample
movzx eax, byte ptr [esi+eax] ; get first sample
movzx ebx, byte ptr [esi+ebx] ; get second sample
ALIGN 4
mix8Mloop:
movzx edx, byte ptr [edi] ; get current sample from destination
apatch1:
movsx eax, byte ptr [2*eax+12345678h] ; volume translate first sample
apatch2:
movsx ebx, byte ptr [2*ebx+12345678h] ; volume translate second sample
add eax, edx ; mix first sample
apatch9:
movzx edx, byte ptr [edi + 1] ; get current sample from destination
apatch3:
mov eax, [eax + 12345678h] ; harsh clip new sample
add ebx, edx ; mix second sample
mov [edi], al ; write new sample to destination
mov edx, ebp ; begin calculating third sample
apatch4:
mov ebx, [ebx + 12345678h] ; harsh clip new sample
apatch5:
add ebp,12345678h ; advance frac pointer
shr edx, 16 ; finish calculation for third sample
mov eax, ebp ; begin calculating fourth sample
apatch7:
add edi, 1 ; move destination to second sample
shr eax, 16 ; finish calculation for fourth sample
mov [edi], bl ; write new sample to destination
apatch6:
add ebp,12345678h ; advance frac pointer
movzx ebx, byte ptr [esi+eax] ; get fourth sample
movzx eax, byte ptr [esi+edx] ; get third sample
apatch8:
add edi, 2 ; move destination to third sample
dec ecx ; decrement count
jnz mix8Mloop ; loop
mov _MV_MixDestination, edi ; Store the current write position
mov _MV_MixPosition, ebp ; return position
exit8m:
popad
ret
ENDP MV_Mix8BitMono_
;================
;
; MV_Mix8BitStereo
;
;================
; eax - position
; edx - rate
; ebx - start
; ecx - number of samples to mix
PROC MV_Mix8BitStereo_
PUBLIC MV_Mix8BitStereo_
pushad
mov ebp, eax
mov esi, ebx ; Source pointer
; Sample size
mov ebx, _MV_SampleSize
mov eax,OFFSET bpatch8+2 ; convice tasm to modify code...
mov [eax],bl
; Right channel offset
mov ebx, _MV_RightChannelOffset
mov eax,OFFSET bpatch6+3 ; convice tasm to modify code...
mov [eax],ebx
mov eax,OFFSET bpatch7+2 ; convice tasm to modify code...
mov [eax],ebx
; Volume table ptr
mov ebx, _MV_LeftVolume
mov eax,OFFSET bpatch1+4 ; convice tasm to modify code...
mov [eax],ebx
mov ebx, _MV_RightVolume
mov eax,OFFSET bpatch2+4 ; convice tasm to modify code...
mov [eax],ebx
; Rate scale ptr
mov eax,OFFSET bpatch3+2 ; convice tasm to modify code...
mov [eax],edx
; Harsh Clip table ptr
mov ebx, _MV_HarshClipTable
add ebx,128
mov eax,OFFSET bpatch4+2 ; convice tasm to modify code...
mov [eax],ebx
mov eax,OFFSET bpatch5+2 ; convice tasm to modify code...
mov [eax],ebx
mov edi, _MV_MixDestination ; Get the position to write to
; Number of samples to mix
cmp ecx, 0
je short exit8S
; eax - scratch
; ebx - scratch
; edx - scratch
; ecx - count
; edi - destination
; esi - source
; ebp - frac pointer
; bpatch1 - left volume table
; bpatch2 - right volume table
; bpatch3 - sample rate
; bpatch4 - harsh clip table
; bpatch5 - harsh clip table
mov eax,ebp ; begin calculating first sample
shr eax,16 ; finish calculation for first sample
movzx ebx, byte ptr [esi+eax] ; get first sample
ALIGN 4
mix8Sloop:
bpatch1:
movsx eax, byte ptr [2*ebx+12345678h] ; volume translate left sample
movzx edx, byte ptr [edi] ; get current sample from destination
bpatch2:
movsx ebx, byte ptr [2*ebx+12345678h] ; volume translate right sample
add eax, edx ; mix left sample
bpatch3:
add ebp,12345678h ; advance frac pointer
bpatch6:
movzx edx, byte ptr [edi+12345678h] ; get current sample from destination
bpatch4:
mov eax, [eax + 12345678h] ; harsh clip left sample
add ebx, edx ; mix right sample
mov [edi], al ; write left sample to destination
bpatch5:
mov ebx, [ebx + 12345678h] ; harsh clip right sample
mov edx, ebp ; begin calculating second sample
bpatch7:
mov [edi+12345678h], bl ; write right sample to destination
shr edx, 16 ; finish calculation for second sample
bpatch8:
add edi, 2 ; move destination to second sample
movzx ebx, byte ptr [esi+edx] ; get second sample
dec ecx ; decrement count
jnz mix8Sloop ; loop
mov _MV_MixDestination, edi ; Store the current write position
mov _MV_MixPosition, ebp ; return position
EXIT8S:
popad
ret
ENDP MV_Mix8BitStereo_
;================
;
; MV_Mix16BitMono
;
;================
; eax - position
; edx - rate
; ebx - start
; ecx - number of samples to mix
PROC MV_Mix16BitMono_
PUBLIC MV_Mix16BitMono_
; Two at once
pushad
mov ebp, eax
mov esi, ebx ; Source pointer
; Sample size
mov ebx, _MV_SampleSize
mov eax,OFFSET cpatch5+3 ; convice tasm to modify code...
mov [eax],bl
mov eax,OFFSET cpatch6+3 ; convice tasm to modify code...
mov [eax],bl
mov eax,OFFSET cpatch7+2 ; convice tasm to modify code...
add bl,bl
mov [eax],bl
; Volume table ptr
mov ebx, _MV_LeftVolume
mov eax,OFFSET cpatch1+4 ; convice tasm to modify code...
mov [eax],ebx
mov eax,OFFSET cpatch2+4 ; convice tasm to modify code...
mov [eax],ebx
; Rate scale ptr
mov eax,OFFSET cpatch3+2 ; convice tasm to modify code...
mov [eax],edx
mov eax,OFFSET cpatch4+2 ; convice tasm to modify code...
mov [eax],edx
mov edi, _MV_MixDestination ; Get the position to write to
; Number of samples to mix
shr ecx, 1 ; double sample count
cmp ecx, 0
je exit16M
; eax - scratch
; ebx - scratch
; edx - scratch
; ecx - count
; edi - destination
; esi - source
; ebp - frac pointer
; cpatch1 - volume table
; cpatch2 - volume table
; cpatch3 - sample rate
; cpatch4 - sample rate
mov eax,ebp ; begin calculating first sample
add ebp,edx ; advance frac pointer
shr eax,16 ; finish calculation for first sample
mov ebx,ebp ; begin calculating second sample
add ebp,edx ; advance frac pointer
shr ebx,16 ; finish calculation for second sample
movzx eax, byte ptr [esi+eax] ; get first sample
movzx ebx, byte ptr [esi+ebx] ; get second sample
ALIGN 4
mix16Mloop:
movsx edx, word ptr [edi] ; get current sample from destination
cpatch1:
movsx eax, word ptr [2*eax+12345678h] ; volume translate first sample
cpatch2:
movsx ebx, word ptr [2*ebx+12345678h] ; volume translate second sample
add eax, edx ; mix first sample
cpatch5:
movsx edx, word ptr [edi + 2] ; get current sample from destination
cmp eax, -32768 ; Harsh clip sample
jge short m16skip1
mov eax, -32768
jmp short m16skip2
m16skip1:
cmp eax, 32767
jle short m16skip2
mov eax, 32767
m16skip2:
add ebx, edx ; mix second sample
mov [edi], ax ; write new sample to destination
mov edx, ebp ; begin calculating third sample
cmp ebx, -32768 ; Harsh clip sample
jge short m16skip3
mov ebx, -32768
jmp short m16skip4
m16skip3:
cmp ebx, 32767
jle short m16skip4
mov ebx, 32767
m16skip4:
cpatch3:
add ebp,12345678h ; advance frac pointer
shr edx, 16 ; finish calculation for third sample
mov eax, ebp ; begin calculating fourth sample
cpatch6:
mov [edi + 2], bx ; write new sample to destination
shr eax, 16 ; finish calculation for fourth sample
cpatch4:
add ebp,12345678h ; advance frac pointer
movzx ebx, byte ptr [esi+eax] ; get fourth sample
cpatch7:
add edi, 4 ; move destination to third sample
movzx eax, byte ptr [esi+edx] ; get third sample
dec ecx ; decrement count
jnz mix16Mloop ; loop
mov _MV_MixDestination, edi ; Store the current write position
mov _MV_MixPosition, ebp ; return position
EXIT16M:
popad
ret
ENDP MV_Mix16BitMono_
;================
;
; MV_Mix16BitStereo
;
;================
; eax - position
; edx - rate
; ebx - start
; ecx - number of samples to mix
PROC MV_Mix16BitStereo_
PUBLIC MV_Mix16BitStereo_
pushad
mov ebp, eax
mov esi, ebx ; Source pointer
; Sample size
mov ebx, _MV_SampleSize
mov eax,OFFSET dpatch6+2 ; convice tasm to modify code...
mov [eax],bl
; Right channel offset
mov ebx, _MV_RightChannelOffset
mov eax,OFFSET dpatch4+3 ; convice tasm to modify code...
mov [eax],ebx
mov eax,OFFSET dpatch5+3 ; convice tasm to modify code...
mov [eax],ebx
; Volume table ptr
mov ebx, _MV_LeftVolume
mov eax,OFFSET dpatch1+4 ; convice tasm to modify code...
mov [eax],ebx
mov ebx, _MV_RightVolume
mov eax,OFFSET dpatch2+4 ; convice tasm to modify code...
mov [eax],ebx
; Rate scale ptr
mov eax,OFFSET dpatch3+2 ; convice tasm to modify code...
mov [eax],edx
mov edi, _MV_MixDestination ; Get the position to write to
; Number of samples to mix
cmp ecx, 0
je exit16S
; eax - scratch
; ebx - scratch
; edx - scratch
; ecx - count
; edi - destination
; esi - source
; ebp - frac pointer
; dpatch1 - left volume table
; dpatch2 - right volume table
; dpatch3 - sample rate
mov eax,ebp ; begin calculating first sample
shr eax,16 ; finish calculation for first sample
movzx ebx, byte ptr [esi+eax] ; get first sample
ALIGN 4
mix16Sloop:
dpatch1:
movsx eax, word ptr [2*ebx+12345678h] ; volume translate left sample
movsx edx, word ptr [edi] ; get current sample from destination
dpatch2:
movsx ebx, word ptr [2*ebx+12345678h] ; volume translate right sample
add eax, edx ; mix left sample
dpatch3:
add ebp,12345678h ; advance frac pointer
dpatch4:
movsx edx, word ptr [edi+12345678h] ; get current sample from destination
cmp eax, -32768 ; Harsh clip sample
jge short s16skip1
mov eax, -32768
jmp short s16skip2
s16skip1:
cmp eax, 32767
jle short s16skip2
mov eax, 32767
s16skip2:
add ebx, edx ; mix right sample
mov [edi], ax ; write left sample to destination
cmp ebx, -32768 ; Harsh clip sample
jge short s16skip3
mov ebx, -32768
jmp short s16skip4
s16skip3:
cmp ebx, 32767
jle short s16skip4
mov ebx, 32767
s16skip4:
mov edx, ebp ; begin calculating second sample
dpatch5:
mov [edi+12345678h], bx ; write right sample to destination
shr edx, 16 ; finish calculation for second sample
dpatch6:
add edi, 4 ; move destination to second sample
movzx ebx, byte ptr [esi+edx] ; get second sample
dec ecx ; decrement count
jnz mix16Sloop ; loop
mov _MV_MixDestination, edi ; Store the current write position
mov _MV_MixPosition, ebp ; return position
exit16S:
popad
ret
ENDP MV_Mix16BitStereo_
ENDS
END