182 lines
3.8 KiB
NASM
182 lines
3.8 KiB
NASM
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IDEAL
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p386
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MODEL flat
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dataseg
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CODESEG
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MASM
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ALIGN 4
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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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PROC MV_16BitReverb_
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PUBLIC MV_16BitReverb_
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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 ptr [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 ptr [2*eax+ebx+1] ; volume translate low byte of sample
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xor edx, 80h
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movsx edx, word ptr [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 [edi], ax ; write new sample to destination
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jnz rev16loop ; loop
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ret
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ENDP MV_16BitReverb_
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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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PROC MV_8BitReverb_
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PUBLIC MV_8BitReverb_
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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 ptr [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 ptr [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 [edi], al ; write new sample to destination
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jnz rev8loop ; loop
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ret
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ENDP MV_8BitReverb_
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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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PROC MV_16BitReverbFast_
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PUBLIC MV_16BitReverbFast_
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mov esi, eax
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mov eax,OFFSET rpatch16+3
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mov [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 ptr [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 [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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ret
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ENDP MV_16BITREVERBFAST_
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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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PROC MV_8BitReverbFast_
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PUBLIC MV_8BitReverbFast_
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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 [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 ptr [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 [edi], al ; write new sample to destination
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jnz frev8loop ; loop
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ret
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ENDP MV_8BITREVERBFAST_
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ENDS
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END
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