557 lines
18 KiB
NASM
557 lines
18 KiB
NASM
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; Copyright 2020 Electronic Arts Inc.
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;
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; TiberianDawn.DLL and RedAlert.dll and corresponding source code is free
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; software: you can redistribute it and/or modify it under the terms of
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; the GNU General Public License as published by the Free Software Foundation,
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; either version 3 of the License, or (at your option) any later version.
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; TiberianDawn.DLL and RedAlert.dll and corresponding source code is distributed
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; in the hope that it will be useful, but with permitted additional restrictions
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; under Section 7 of the GPL. See the GNU General Public License in LICENSE.TXT
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; distributed with this program. You should have received a copy of the
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; GNU General Public License along with permitted additional restrictions
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; with this program. If not, see [https://github.com/electronicarts/CnC_Remastered_Collection]>.
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; $Header: F:\projects\c&c0\vcs\code\support.asv 5.0 11 Nov 1996 09:40:30 JOE_BOSTIC $
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;***************************************************************************
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;** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S **
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;***************************************************************************
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;* *
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;* Project Name : Command & Conquer *
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;* *
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;* File Name : SUPPORT.ASM *
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;* *
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;* Programmer : Joe L. Bostic *
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;* *
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;* Start Date : September 23, 1993 *
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;* *
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;* Last Update : May 10, 1994 [JLB] *
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;* *
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;*-------------------------------------------------------------------------*
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;* Functions: *
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;* strtrim -- Remove the trailing white space from a string. *
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;* Fat_Put_Pixel -- Draws a fat pixel. *
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;* Conquer_Build_Fading_Table -- Builds custom shadow/light fading table.*
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;* Remove_From_List -- Removes a pointer from a list of pointers. *
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;* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
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IDEAL
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P386
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MODEL USE32 FLAT
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INCLUDE "gbuffer.inc"
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DISPLAY "Command & Conquer assembly support routines."
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CODESEG
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;***************************************************************************
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;* Fat_Put_Pixel -- Draws a fat pixel. *
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;* *
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;* Use this routine to draw a "pixel" that is bigger than 1 pixel *
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;* across. This routine is faster than drawing a similar small shape *
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;* and faster than calling Fill_Rect. *
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;* *
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;* INPUT: x,y -- Screen coordinates to draw the pixel's upper *
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;* left corner. *
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;* *
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;* color -- The color to render the pixel in. *
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;* *
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;* size -- The number of pixels width of the big "pixel". *
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;* *
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;* page -- The pointer to a GraphicBuffer class or something *
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;* *
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;* OUTPUT: none *
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;* *
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;* WARNINGS: none *
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;* *
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;* HISTORY: *
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;* 03/17/1994 JLB : Created. *
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;*=========================================================================*
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; VOID cdecl Fat_Put_Pixel(long x, long y, long color, long size, void *page)
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GLOBAL C Fat_Put_Pixel:NEAR
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PROC Fat_Put_Pixel C near
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USES eax, ebx, ecx, edx, edi, esi
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ARG x:DWORD ; X coordinate of upper left pixel corner.
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ARG y:DWORD ; Y coordinate of upper left pixel corner.
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ARG color:DWORD ; Color to use for the "pixel".
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ARG siz:DWORD ; Size of "pixel" to plot (square).
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ARG gpage:DWORD ; graphic page address to plot onto
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cmp [siz],0
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je short ??exit
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; Set EDI to point to start of logical page memory.
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;*===================================================================
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; Get the viewport information and put bytes per row in ecx
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;*===================================================================
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mov ebx,[gpage] ; get a pointer to viewport
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mov edi,[(GraphicViewPort ebx).GVPOffset] ; get the correct offset
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; Verify the the Y pixel offset is legal.
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mov eax,[y]
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cmp eax,[(GraphicViewPort ebx).GVPHeight] ;YPIXEL_MAX
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jae short ??exit
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mul [(GraphicViewPort ebx).GVPWidth]
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add edi,eax
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; Verify the the X pixel offset is legal.
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mov edx,[(GraphicViewPort ebx).GVPWidth]
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cmp edx,[x]
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jbe short ??exit
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add edi,[x]
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; Write the pixel to the screen.
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mov ebx,[siz] ; Copy of pixel size.
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sub edx,ebx ; Modulo to reach start of next row.
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mov eax,[color]
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??again:
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mov ecx,ebx
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rep stosb
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add edi,edx ; EDI points to start of next row.
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dec [siz]
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jnz short ??again
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??exit:
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ret
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ENDP Fat_Put_Pixel
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if 0
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;***************************************************************************
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;* strtrim -- Remove the trailing white space from a string. *
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;* *
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;* Use this routine to remove white space characters from the beginning *
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;* and end of the string. The string is modified in place by *
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;* this routine. *
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;* *
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;* INPUT: buffer -- Pointer to the string to modify. *
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;* *
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;* OUTPUT: none *
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;* *
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;* WARNINGS: none *
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;* *
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;* HISTORY: *
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;* 10/07/1992 JLB : Created. *
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;*=========================================================================*
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; VOID cdecl strtrim(BYTE *buffer);
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GLOBAL C strtrim :NEAR
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PROC strtrim C near
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USES ax, edi, esi
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ARG buffer:DWORD ; Pointer to string to modify.
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cmp [buffer],0
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je short ??fini
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; Prepare for string scanning by loading pointers.
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cld
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mov esi,[buffer]
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mov edi,esi
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; Strip white space from the start of the string.
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??looper:
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lodsb
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cmp al,20h ; Space
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je short ??looper
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cmp al,9 ; TAB
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je short ??looper
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stosb
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; Copy the rest of the string.
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??gruntloop:
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lodsb
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stosb
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or al,al
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jnz short ??gruntloop
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dec edi
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; Strip the white space from the end of the string.
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??looper2:
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mov [edi],al
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dec edi
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mov ah,[edi]
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cmp ah,20h
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je short ??looper2
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cmp ah,9
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je short ??looper2
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??fini:
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ret
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ENDP strtrim
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;***************************************************************************
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;* Conquer_Build_Fading_Table -- Builds custom shadow/light fading table. *
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;* *
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;* This routine is used to build a special fading table for C&C. There *
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;* are certain colors that get faded to and cannot be faded again. *
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;* With this rule, it is possible to draw a shadow multiple times and *
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;* not have it get any lighter or darker. *
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;* *
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;* INPUT: palette -- Pointer to the 768 byte IBM palette to build from. *
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;* *
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;* dest -- Pointer to the 256 byte remap table. *
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;* *
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;* color -- Color index of the color to "fade to". *
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;* *
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;* frac -- The fraction to fade to the specified color *
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;* *
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;* OUTPUT: Returns with pointer to the remap table. *
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;* *
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;* WARNINGS: none *
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;* *
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;* HISTORY: *
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;* 10/07/1992 JLB : Created. *
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;*=========================================================================*/
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;VOID * cdecl Conquer_Build_Fading_Table(VOID *palette, VOID *dest, long color, long frac);
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GLOBAL C Conquer_Build_Fading_Table : NEAR
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PROC Conquer_Build_Fading_Table C near
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USES ebx, ecx, edi, esi
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ARG palette:DWORD
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ARG dest:DWORD
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ARG color:DWORD
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ARG frac:DWORD
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LOCAL matchvalue:DWORD ; Last recorded match value.
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LOCAL targetred:BYTE ; Target gun red.
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LOCAL targetgreen:BYTE ; Target gun green.
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LOCAL targetblue:BYTE ; Target gun blue.
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LOCAL idealred:BYTE
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LOCAL idealgreen:BYTE
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LOCAL idealblue:BYTE
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LOCAL matchcolor:BYTE ; Tentative match color.
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ALLOWED_COUNT EQU 16
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ALLOWED_START EQU 256-ALLOWED_COUNT
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cld
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; If the source palette is NULL, then just return with current fading table pointer.
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cmp [palette],0
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je ??fini1
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cmp [dest],0
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je ??fini1
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; Fractions above 255 become 255.
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mov eax,[frac]
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cmp eax,0100h
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jb short ??ok
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mov [frac],0FFh
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??ok:
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; Record the target gun values.
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mov esi,[palette]
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mov ebx,[color]
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add esi,ebx
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add esi,ebx
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add esi,ebx
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lodsb
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mov [targetred],al
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lodsb
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mov [targetgreen],al
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lodsb
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mov [targetblue],al
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; Main loop.
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xor ebx,ebx ; Remap table index.
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; Transparent black never gets remapped.
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mov edi,[dest]
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mov [edi],bl
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inc edi
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; EBX = source palette logical number (1..255).
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; EDI = running pointer into dest remap table.
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??mainloop:
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inc ebx
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mov esi,[palette]
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add esi,ebx
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add esi,ebx
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add esi,ebx
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mov edx,[frac]
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shr edx,1
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; new = orig - ((orig-target) * fraction);
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lodsb ; orig
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mov dh,al ; preserve it for later.
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sub al,[targetred] ; al = (orig-target)
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imul dl ; ax = (orig-target)*fraction
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shl eax,1
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sub dh,ah ; dh = orig - ((orig-target) * fraction)
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mov [idealred],dh ; preserve ideal color gun value.
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lodsb ; orig
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mov dh,al ; preserve it for later.
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sub al,[targetgreen] ; al = (orig-target)
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imul dl ; ax = (orig-target)*fraction
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shl eax,1
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sub dh,ah ; dh = orig - ((orig-target) * fraction)
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mov [idealgreen],dh ; preserve ideal color gun value.
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lodsb ; orig
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mov dh,al ; preserve it for later.
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sub al,[targetblue] ; al = (orig-target)
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imul dl ; ax = (orig-target)*fraction
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shl eax,1
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sub dh,ah ; dh = orig - ((orig-target) * fraction)
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mov [idealblue],dh ; preserve ideal color gun value.
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; Sweep through a limited set of existing colors to find the closest
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; matching color.
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mov eax,[color]
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mov [matchcolor],al ; Default color (self).
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mov [matchvalue],-1 ; Ridiculous match value init.
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mov ecx,ALLOWED_COUNT
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mov esi,[palette] ; Pointer to original palette.
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add esi,(ALLOWED_START)*3
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; BH = color index.
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mov bh,ALLOWED_START
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??innerloop:
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xor edx,edx ; Comparison value starts null.
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; Build the comparison value based on the sum of the differences of the color
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; guns squared.
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lodsb
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sub al,[idealred]
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mov ah,al
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imul ah
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add edx,eax
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lodsb
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sub al,[idealgreen]
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mov ah,al
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imul ah
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add edx,eax
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lodsb
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sub al,[idealblue]
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mov ah,al
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imul ah
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add edx,eax
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jz short ??perfect ; If perfect match found then quit early.
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cmp edx,[matchvalue]
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jae short ??notclose
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mov [matchvalue],edx ; Record new possible color.
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mov [matchcolor],bh
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??notclose:
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inc bh ; Checking color index.
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loop ??innerloop
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mov bh,[matchcolor]
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??perfect:
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mov [matchcolor],bh
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xor bh,bh ; Make BX valid main index again.
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; When the loop exits, we have found the closest match.
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mov al,[matchcolor]
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stosb
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cmp ebx,ALLOWED_START-1
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jne ??mainloop
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; Fill the remainder of the remap table with values
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; that will remap the color to itself.
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mov ecx,ALLOWED_COUNT
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??fillerloop:
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inc bl
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mov al,bl
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stosb
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loop ??fillerloop
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??fini1:
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mov esi,[dest]
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mov eax,esi
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ret
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ENDP Conquer_Build_Fading_Table
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;***************************************************************************
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;* Remove_From_List -- Removes a pointer from a list of pointers. *
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;* *
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;* This low level routine is used to remove a pointer from a list of *
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;* pointers. The trailing pointers are moved downward to fill the *
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;* hole. *
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;* *
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;* INPUT: list -- Pointer to list of pointer. *
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;* *
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;* index -- Pointer to length of pointer list. *
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;* *
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;* ptr -- The pointer value to search for and remove. *
|
||
|
|
;* *
|
||
|
|
;* OUTPUT: none *
|
||
|
|
;* *
|
||
|
|
;* WARNINGS: none *
|
||
|
|
;* *
|
||
|
|
;* HISTORY: *
|
||
|
|
;* 04/11/1994 JLB : Created. *
|
||
|
|
;* 04/22/1994 JLB : Convert to assembly language. *
|
||
|
|
;* 05/10/1994 JLB : Short pointers now. *
|
||
|
|
;*=========================================================================*/
|
||
|
|
;VOID cdecl Remove_From_List(VOID **list, long *index, long ptr);
|
||
|
|
GLOBAL C Remove_From_List:NEAR
|
||
|
|
PROC Remove_From_List C near
|
||
|
|
USES edi, esi, ecx, eax
|
||
|
|
ARG list:DWORD ; Pointer to list.
|
||
|
|
ARG index:DWORD ; Pointer to count.
|
||
|
|
ARG element:DWORD ; Element to remove.
|
||
|
|
|
||
|
|
; Fetch the number of elements in the list. If there are no
|
||
|
|
; elements, then just exit quickly.
|
||
|
|
mov edi,[index]
|
||
|
|
mov ecx,[edi]
|
||
|
|
jcxz short ??fini2
|
||
|
|
|
||
|
|
; Fetch pointer to list.
|
||
|
|
cmp [list],0
|
||
|
|
je short ??fini2
|
||
|
|
mov edi,[list]
|
||
|
|
|
||
|
|
; Loop through all elements searching for a match.
|
||
|
|
mov eax,[element]
|
||
|
|
repne scasd
|
||
|
|
jne short ??fini2 ; No match found.
|
||
|
|
|
||
|
|
; Copy all remaining elements down. If this is the
|
||
|
|
; last element in the list then nothing needs to be
|
||
|
|
; copied -- just decrement the list size.
|
||
|
|
jcxz short ??nocopy ; No copy necessary.
|
||
|
|
mov esi,edi
|
||
|
|
sub edi,4
|
||
|
|
rep movsd
|
||
|
|
|
||
|
|
; Reduce the list count by one.
|
||
|
|
??nocopy:
|
||
|
|
mov edi,[index]
|
||
|
|
dec [DWORD PTR edi]
|
||
|
|
|
||
|
|
??fini2:
|
||
|
|
ret
|
||
|
|
|
||
|
|
ENDP Remove_From_List
|
||
|
|
|
||
|
|
|
||
|
|
; long cdecl Get_EAX();
|
||
|
|
GLOBAL C Get_EAX :NEAR
|
||
|
|
PROC Get_EAX C near
|
||
|
|
ret
|
||
|
|
|
||
|
|
ENDP Get_EAX
|
||
|
|
endif
|
||
|
|
|
||
|
|
|
||
|
|
DATASEG
|
||
|
|
|
||
|
|
TabA DD 6949350
|
||
|
|
DD 4913933
|
||
|
|
DD 3474675
|
||
|
|
DD 2456966
|
||
|
|
DD 1737338
|
||
|
|
DD 1228483
|
||
|
|
DD 868669
|
||
|
|
DD 614242
|
||
|
|
DD 434334
|
||
|
|
DD 307121
|
||
|
|
DD 217167
|
||
|
|
DD 153560
|
||
|
|
DD 108584
|
||
|
|
DD 76780
|
||
|
|
DD 54292
|
||
|
|
DD 38390
|
||
|
|
DD 27146
|
||
|
|
DD 19195
|
||
|
|
DD 13573
|
||
|
|
DD 9598
|
||
|
|
DD 6786
|
||
|
|
DD 4799
|
||
|
|
DD 3393
|
||
|
|
DD 2399
|
||
|
|
DD 1697
|
||
|
|
DD 1200
|
||
|
|
DD 848
|
||
|
|
DD 600
|
||
|
|
DD 424
|
||
|
|
DD 300
|
||
|
|
DD 212
|
||
|
|
DD 150
|
||
|
|
DD 106
|
||
|
|
|
||
|
|
TabB DD 154
|
||
|
|
DD 218
|
||
|
|
DD 309
|
||
|
|
DD 437
|
||
|
|
DD 618
|
||
|
|
DD 874
|
||
|
|
DD 1236
|
||
|
|
DD 1748
|
||
|
|
DD 2472
|
||
|
|
DD 3496
|
||
|
|
DD 4944
|
||
|
|
DD 6992
|
||
|
|
DD 9888
|
||
|
|
DD 13983
|
||
|
|
DD 19775
|
||
|
|
DD 27967
|
||
|
|
DD 39551
|
||
|
|
DD 55933
|
||
|
|
DD 79101
|
||
|
|
DD 111866
|
||
|
|
DD 158203
|
||
|
|
DD 223732
|
||
|
|
DD 316405
|
||
|
|
DD 447465
|
||
|
|
DD 632811
|
||
|
|
DD 894929
|
||
|
|
DD 1265621
|
||
|
|
DD 1789859
|
||
|
|
DD 2531243
|
||
|
|
DD 3579718
|
||
|
|
DD 5062486
|
||
|
|
DD 7159436
|
||
|
|
DD 10124971
|
||
|
|
|
||
|
|
CODESEG
|
||
|
|
|
||
|
|
;***********************************************************************************************
|
||
|
|
;* Square_Root -- Finds the square root of the fixed pointer parameter. *
|
||
|
|
;* *
|
||
|
|
;* INPUT: val -- The fixed point (16:16) value to find the square root of. *
|
||
|
|
;* *
|
||
|
|
;* OUTPUT: Returns with the square root of the fixed pointer parameter. *
|
||
|
|
;* *
|
||
|
|
;* WARNINGS: none *
|
||
|
|
;* *
|
||
|
|
;* HISTORY: *
|
||
|
|
;* 10/04/1995 JLB : Adapted. *
|
||
|
|
;*=============================================================================================*/
|
||
|
|
;unsigned Square_Root(unsigned val);
|
||
|
|
GLOBAL C Square_Root :NEAR
|
||
|
|
PROC Square_Root C near
|
||
|
|
USES ebx,edx
|
||
|
|
|
||
|
|
bsr ebx,eax
|
||
|
|
jz ??zero
|
||
|
|
|
||
|
|
mul [DWORD 4*ebx + OFFSET TabA]
|
||
|
|
shrd eax,edx,10h
|
||
|
|
add eax, [4*ebx + OFFSET TabB]
|
||
|
|
??zero:
|
||
|
|
ret
|
||
|
|
|
||
|
|
ENDP Square_Root
|
||
|
|
|
||
|
|
;----------------------------------------------------------------------------
|
||
|
|
|
||
|
|
END
|
||
|
|
|