140 lines
4.1 KiB
NASM
140 lines
4.1 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/>.
|
||
;
|
||
|
||
; $Header: g:/library/wwlib32/video/rcs/vertblnk.asm 1.1 1994/04/18 09:34:51 jeff_wilson Exp $
|
||
;***************************************************************************
|
||
;** C O N F I D E N T I A L --- W E S T W O O D A S S O C I A T E S **
|
||
;***************************************************************************
|
||
;* *
|
||
;* Project Name : Library routine *
|
||
;* *
|
||
;* File Name : VERTBLNK.ASM *
|
||
;* *
|
||
;* Programmer : Christopher Yates *
|
||
;* *
|
||
;* Last Update : 20 August, 1990 [CY] *
|
||
;* *
|
||
;*-------------------------------------------------------------------------*
|
||
;* Functions: *
|
||
;* *
|
||
; WORD Get_Vert_Blank(VOID); *
|
||
; VOID Wait_Vert_Blank(VOID); *
|
||
; WORD get_vga_state (VOID) ;
|
||
; VOID set_vga_mode (WORD) ;
|
||
;* *
|
||
;* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
|
||
|
||
IDEAL
|
||
P386
|
||
MODEL USE32 FLAT
|
||
|
||
LOCALS ??
|
||
|
||
GLOBAL Get_Vert_Blank : NEAR
|
||
GLOBAL Wait_Vert_Blank : NEAR
|
||
GLOBAL get_vga_state : NEAR
|
||
GLOBAL set_vga_mode : NEAR
|
||
|
||
|
||
CODESEG
|
||
|
||
; ----------------------------------------------------------------
|
||
;
|
||
; Here are prototypes for the routines defined within this module:
|
||
;
|
||
; WORD Get_Vert_Blank(VOID);
|
||
; VOID Wait_Vert_Blank(VOID);
|
||
; WORD get_vga_state (VOID) ;
|
||
; VOID set_vga_mode (WORD) ;
|
||
|
||
;
|
||
; ----------------------------------------------------------------
|
||
|
||
;----------------------------------------------------------------------------
|
||
|
||
PROC Get_Vert_Blank C near
|
||
USES edx
|
||
|
||
mov dx,03DAH ; CRTC status register
|
||
in al,dx
|
||
and al,008H ; look at bit 3 vertical sync
|
||
xor ah,ah ; zero ah
|
||
ret
|
||
|
||
ENDP Get_Vert_Blank
|
||
|
||
;----------------------------------------------------------------------------
|
||
|
||
;----------------------------------------------------------------------------
|
||
PROC Wait_Vert_Blank C near
|
||
USES eax,ebx,edx
|
||
ARG blank:DWORD
|
||
|
||
mov ebx,[blank] ; get vertical blank 0 or 1 for on
|
||
|
||
mov edx,03DAH ; CRTC status register
|
||
|
||
and bl,01b
|
||
shl bl,3
|
||
|
||
??in_vbi:
|
||
in al,dx ; read CRTC status
|
||
and al,008h ; only vertical sync bit
|
||
xor al,bl
|
||
je ??in_vbi ; in vertical sync
|
||
|
||
??out_vbi:
|
||
in al,dx ; read CRTC status
|
||
and al,008h ; only vertical sync bit
|
||
xor al,bl
|
||
jne ??out_vbi ; not in vertical sync
|
||
|
||
ret
|
||
|
||
ENDP Wait_Vert_Blank
|
||
|
||
;----------------------------------------------------------------------------
|
||
|
||
; WORD get_vga_state (VOID) ;
|
||
|
||
PROC get_vga_state C near
|
||
USES ebx
|
||
mov eax,0f00h
|
||
int 10h
|
||
and eax, 0ffh
|
||
ret
|
||
ENDP get_vga_state
|
||
|
||
;----------------------------------------------------------------------------
|
||
|
||
; VOID set_vga_mode (WORD) ;
|
||
|
||
PROC set_vga_mode C near
|
||
ARG mode:dword
|
||
mov eax , [mode]
|
||
and eax , 0ffh
|
||
int 10h
|
||
ret
|
||
ENDP set_vga_mode
|
||
|
||
|
||
|
||
END
|
||
|
||
|