Restoring interpolation routine to the original.

zsnes/src/video/copyvid.inc

@@ -2711,42 +2711,44 @@ NEWSYM copyvesa2320x240x16b
     ;cmp byte[ScreenScale],1
     ;je .infsloopa
 .inloopa
-    mov bx,[esi]
-    mov ecx,256-2
-    mov ax,[esi+2]
-    add esi,byte 2
-    mov [es:edi],bx
-    add edi,byte 2
-.inloopb
-    push eax
-    mov ebp,[esi+2]
-    shr eax,byte 1
-    push ebp
-    shr ebx,byte 2
-    and eax,7befh
-    shr ebp,byte 2
-    and ebx,39e7h
-    add eax,ebx
-    and ebp,39e7h
-    add eax,ebp
+    mov ax,[esi]
     mov [es:edi],ax
-    pop eax
-    pop ebx
+    add esi,byte 2
+    add edi,byte 2
+    mov ecx,254
+    jmp .inloopb
+.inloopa2
+    mov ax,[esi]
+    mov [es:edi],ax
+    add esi,32*2+2
+    add edi,64*2+2
+    dec dl
+    jnz .inloopa
+    jmp .done
+.inloopb
+    mov ax,[esi]
+    mov bx,[esi-2]
+    cmp ax,bx
+    jne .inloopb2
+    mov [es:edi],ax
+    mov [es:edi-2],bx
+    jmp .inloopb3
+.inloopb2
+    shr ax,byte 1
+    shr bx,byte 1
+    and ax,7befh
+    and bx,7befh
+    add ax,bx
+    mov [es:edi],ax
+    mov [es:edi-2],ax
+    jmp .inloopb3
 .inloopb3
     add esi,byte 2
     add edi,byte 2
     dec ecx
     jnz .inloopb
-.inloopa2
-    mov ax,[esi]
-    add esi,byte 2
-    mov [es:edi],ax
-    add edi,byte 2
-    add esi,byte 32*2
-    sub edi,byte -64*2
-    dec dl
-    jnz .inloopa
-    
+    jmp .inloopa2
+
 .done
     pop es
     ret
@@ -3311,56 +3313,64 @@ NEWSYM copyvesa2320x480x16b
 
 .interpolate
     cmp byte[scanlines],1
-    je .inloopb
+    je .inloopa2
 .inloopa
-    call .inloopc
-    sub esi,256*2
-    add edi,32*2+32*2
-    call .inloopc
-    add esi,32*2
-    add edi,32*2+32*2
+    mov ax,[esi]
+    mov [es:edi],ax
+    add esi,byte 2
+    add edi,byte 2
+    mov ecx,254
+    call .inloopb
+    mov ax,[esi]
+    mov [es:edi],ax
+    sub esi,256*2-2
+    add edi,64*2+2
+    mov ax,[esi]
+    mov [es:edi],ax
+    add esi,byte 2
+    add edi,byte 2
+    mov ecx,254
+    call .inloopb
+    add esi,32*2+2
+    add edi,64*2+2
     dec dl
     jnz .inloopa
     jmp .done
-.inloopb
-    call .inloopc
-    add esi,32*2
-    add edi,32*2+320*2+32*2
-    dec dl
-    jnz .inloopb
-    jmp .done
-.inloopc
-    mov bx,[esi]
-    mov ecx,256-2
-    mov ax,[esi+2]
-    add esi,byte 2
-    mov [es:edi],bx
-    add edi,byte 2
-    call .inloopc2
+.inloopa2
     mov ax,[esi]
+    mov [es:edi],ax
     add esi,byte 2
-    mov [es:edi],ax
     add edi,byte 2
-    ret
-.inloopc2
-    push eax
-    mov ebp,[esi+2]
-    shr eax,byte 1
-    push ebp
-    shr ebx,byte 2
-    and eax,7befh
-    shr ebp,byte 2
-    and ebx,39e7h
-    add eax,ebx
-    and ebp,39e7h
-    add eax,ebp
+    mov ecx,254
+    call .inloopb
+    mov ax,[esi]
     mov [es:edi],ax
-    pop eax
-    pop ebx
+    add esi,16*2+16*2+2
+    add edi,32*2+320*2+32*2+2
+    dec dl
+    jnz .inloopa2
+    jmp .done
+.inloopb
+    mov ax,[esi]
+    mov bx,[esi-2]
+    cmp ax,bx
+    jne .inloopb2
+    mov [es:edi],ax
+    mov [es:edi-2],bx
+    jmp .inloopb3
+.inloopb2
+    shr ax,byte 1
+    shr bx,byte 1
+    and ax,7befh
+    and bx,7befh
+    add ax,bx
+    mov [es:edi],ax
+    mov [es:edi-2],ax
+.inloopb3
     add esi,byte 2
     add edi,byte 2
     dec ecx
-    jnz .inloopc2
+    jnz .inloopb
     ret
 
 .done