140 lines
4.1 KiB
NASM
140 lines
4.1 KiB
NASM
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; Command & Conquer Red Alert(tm)
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; Copyright 2025 Electronic Arts Inc.
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;
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; This program is free software: you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation, either version 3 of the License, or
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; (at your option) any later version.
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;
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; This program is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program. If not, see <http://www.gnu.org/licenses/>.
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;
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; $Header: g:/library/wwlib32/video/rcs/vertblnk.asm 1.1 1994/04/18 09:34:51 jeff_wilson Exp $
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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 A S S O C I A T E S **
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;***************************************************************************
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;* *
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;* Project Name : Library routine *
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;* *
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;* File Name : VERTBLNK.ASM *
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;* *
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;* Programmer : Christopher Yates *
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;* *
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;* Last Update : 20 August, 1990 [CY] *
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;* *
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;*-------------------------------------------------------------------------*
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;* Functions: *
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;* *
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; WORD Get_Vert_Blank(VOID); *
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; VOID Wait_Vert_Blank(VOID); *
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; WORD get_vga_state (VOID) ;
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; VOID set_vga_mode (WORD) ;
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;* *
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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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LOCALS ??
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GLOBAL Get_Vert_Blank : NEAR
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GLOBAL Wait_Vert_Blank : NEAR
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GLOBAL get_vga_state : NEAR
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GLOBAL set_vga_mode : NEAR
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CODESEG
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; ----------------------------------------------------------------
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;
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; Here are prototypes for the routines defined within this module:
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;
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; WORD Get_Vert_Blank(VOID);
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; VOID Wait_Vert_Blank(VOID);
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; WORD get_vga_state (VOID) ;
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; VOID set_vga_mode (WORD) ;
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;
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; ----------------------------------------------------------------
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;----------------------------------------------------------------------------
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PROC Get_Vert_Blank C near
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USES edx
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mov dx,03DAH ; CRTC status register
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in al,dx
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and al,008H ; look at bit 3 vertical sync
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xor ah,ah ; zero ah
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ret
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ENDP Get_Vert_Blank
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;----------------------------------------------------------------------------
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;----------------------------------------------------------------------------
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PROC Wait_Vert_Blank C near
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USES eax,ebx,edx
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ARG blank:DWORD
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mov ebx,[blank] ; get vertical blank 0 or 1 for on
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mov edx,03DAH ; CRTC status register
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and bl,01b
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shl bl,3
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??in_vbi:
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in al,dx ; read CRTC status
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and al,008h ; only vertical sync bit
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xor al,bl
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je ??in_vbi ; in vertical sync
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??out_vbi:
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in al,dx ; read CRTC status
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and al,008h ; only vertical sync bit
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xor al,bl
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jne ??out_vbi ; not in vertical sync
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ret
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ENDP Wait_Vert_Blank
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;----------------------------------------------------------------------------
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; WORD get_vga_state (VOID) ;
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PROC get_vga_state C near
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USES ebx
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mov eax,0f00h
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int 10h
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and eax, 0ffh
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ret
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ENDP get_vga_state
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;----------------------------------------------------------------------------
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; VOID set_vga_mode (WORD) ;
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PROC set_vga_mode C near
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ARG mode:dword
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mov eax , [mode]
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and eax , 0ffh
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int 10h
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ret
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ENDP set_vga_mode
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END
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