CnC_Red_Alert/WWFLAT32/SVGAPRIM/VPUTPIX.ASM

116 lines
5.3 KiB
NASM

;
; Command & Conquer Red Alert(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 **
;***************************************************************************
;* *
;* Project Name : Clear the Full Mcga Screen *
;* *
;* File Name : PUTPIXEL.ASM *
;* *
;* Programmer : Phil Gorrow *
;* *
;* Start Date : June 7, 1994 *
;* *
;* Last Update : June 8, 1994 [PWG] *
;* *
;*-------------------------------------------------------------------------*
;* Functions: *
;* GVPC::Put_Pixel -- Puts a pixel on a graphic viewport *
;* VIVPC::Put_Pixel -- Puts a pixel on a virtual viewport *
;* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
IDEAL
P386
MODEL USE32 FLAT
LOCALS ??
INCLUDE "svgaprim.inc"
INCLUDE "gbuffer.inc"
CODESEG
;***************************************************************************
;* VIVPC::PUT_PIXEL -- Puts a pixel on a video viewport *
;* *
;* INPUT: WORD the x position for the pixel relative to the upper *
;* left corner of the viewport *
;* WORD the y pos for the pixel relative to the upper left *
;* corner of the viewport *
;* UBYTE the color of the pixel to write *
;* *
;* OUTPUT: none *
;* *
;* WARNING: If pixel is to be placed outside of the viewport then *
;* this routine will abort. *
;* *
;* HISTORY: *
;* 06/08/1994 PWG : Created. *
;*=========================================================================*
PROC Vesa_Put_Pixel C near
USES eax,ebx,ecx,edx,edi,esi
ARG this:DWORD ; this is a member function
ARG x_pixel:DWORD ; x position of pixel to set
ARG y_pixel:DWORD ; y position of pixel to set
ARG color:BYTE ; what color should we clear to
;*===================================================================
; Get the viewport information and put bytes per row in ecx
;*===================================================================
mov ebx,[this] ; get a pointer to viewport
mov edi,[(VideoViewPort ebx).VIVPOffset] ; get the correct offset
mov ecx,[(VideoViewPort ebx).VIVPHeight] ; edx = height of viewport
mov edx,[(VideoViewPort ebx).VIVPWidth] ; ecx = width of viewport
;*===================================================================
; Verify that the X pixel offset if legal
;*===================================================================
mov eax,[x_pixel] ; find the x position
cmp eax,edx ; is it out of bounds
jae short ??exit ; if so then get out
add edi,eax ; otherwise add in offset
;*===================================================================
; Verify that the Y pixel offset if legal
;*===================================================================
mov eax,[y_pixel] ; get the y position
cmp eax,ecx ; is it out of bounds
jae ??exit ; if so then get out
add edx,[(VideoViewPort ebx).VIVPXAdd] ; otherwise find bytes per row
mul edx ; offset = bytes per row * y
add edi,eax ; add it into the offset
;*===================================================================
;* Figure out what bank we are in and set it, then adjust the
;* offset.
;*===================================================================
call Vesa_Asm_Set_Win
;*===================================================================
; Write the pixel to the screen
;*===================================================================
mov al,[color] ; read in color value
mov [edi],al ; write it to the screen
??exit:
ret
ENDP Vesa_Put_Pixel
END