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Initial commit of Command & Conquer source code.

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2025-02-27 14:50:48 +00:00
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;
; Command & Conquer(tm)
; Copyright 2025 Electronic Arts Inc.
;
; This program is free software: you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation, either version 3 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program. If not, see <http://www.gnu.org/licenses/>.
;
;***************************************************************************
;** 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 I N C **
;***************************************************************************
;* *
;* Project Name : Command & Conquer *
;* *
;* File Name : COORDA.ASM *
;* *
;* Programmer : Barry W. Green *
;* *
;* Start Date : February 17, 1995 *
;* *
;* Last Update : February 17, 1995 [BWG] *
;* *
;*-------------------------------------------------------------------------*
;* Functions: *
;* Cardinal_To_Fixed -- Converts cardinal numbers into a fixed point number. *
;* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
IDEAL
P386
MODEL USE32 FLAT
global C Cardinal_To_Fixed :NEAR
global C Fixed_To_Cardinal :NEAR
CODESEG
;***********************************************************************************************
;* Cardinal_To_Fixed -- Converts cardinal numbers into a fixed point number. *
;* *
;* This utility function will convert cardinal numbers into a fixed point fraction. The *
;* use of fixed point numbers occurs throughout the product -- since it is a convenient *
;* tool. The fixed point number is based on the formula: *
;* *
;* result = cardinal / base *
;* *
;* The accuracy of the fixed point number is limited to 1/256 as the lowest and up to *
;* 256 as the largest. *
;* *
;* INPUT: base -- The key number to base the fraction about. *
;* *
;* cardinal -- The other number (hey -- what do you call it?) *
;* *
;* OUTPUT: Returns with the fixed point number of the "cardinal" parameter as it relates *
;* to the "base" parameter. *
;* *
;* WARNINGS: none *
;* *
;* HISTORY: *
;* 02/17/1995 BWG : Created. *
;*=============================================================================================*/
;unsigned int Cardinal_To_Fixed(unsigned base, unsigned cardinal);
PROC Cardinal_To_Fixed C near
USES ebx, edx
ARG base:DWORD
ARG cardinal:DWORD
mov eax,0FFFFh ; establish default return value
mov ebx,[base]
or ebx,ebx
jz near ??retneg1 ; if base==0, return 65535
mov eax,[cardinal] ; otherwise, return (cardinal*256)/base
shl eax,8
xor edx,edx
div ebx
??retneg1:
ret
ENDP Cardinal_To_Fixed
;***********************************************************************************************
;* Fixed_To_Cardinal -- Converts a fixed point number into a cardinal number. *
;* *
;* Use this routine to convert a fixed point number into a cardinal number. *
;* *
;* INPUT: base -- The base number that the original fixed point number was created from. *
;* *
;* fixed -- The fixed point number to convert. *
;* *
;* OUTPUT: Returns with the reconverted number. *
;* *
;* WARNINGS: none *
;* *
;* HISTORY: *
;* 02/17/1995 BWG : Created. *
;*=============================================================================================*/
;unsigned int Fixed_To_Cardinal(unsigned base, unsigned fixed);
PROC Fixed_To_Cardinal C near
USES edx
ARG base:DWORD
ARG fixed:DWORD
mov eax,[base]
mul [fixed]
add eax,080h ; eax = (base * fixed) + 0x80
test eax,0FF000000h ; if high byte set, return FFFF
jnz ??rneg1
shr eax,8 ; else, return eax/256
ret
??rneg1 :
mov eax,0FFFFh ; establish default return value
ret
ENDP Fixed_To_Cardinal
END