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Gold Medal Software 2
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Gold Medal Software Volume 2 (Gold Medal) (1994).iso
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asm_n_z.arj
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VIDEO.ASM
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Assembly Source File
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1986-04-07
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20KB
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448 lines
;-------------------------------------------------------------------------------
;
; video.asm created 5-11-85
;
; VIDEO ROUTINES
; (C) COPYRIGHT 1985 BY THOMAS D. WEBB
;
; MODIFIED FOR MICROSOFT 'C' BY GREGORY ETCHELL 4-1-86
;
; ALL RIGHTS RESERVED.
; PERMISSION IS GRANTED FOR UNLIMITED PERSONAL, NON-COMMERCIAL USE ONLY.
;
;-------------------------------------------------------------------------------
TITLE VIDEO
_TEXT SEGMENT BYTE PUBLIC 'CODE'
_TEXT ENDS
CONST SEGMENT WORD PUBLIC 'CONST'
CONST ENDS
_BSS SEGMENT WORD PUBLIC 'BSS'
_BSS ENDS
_DATA SEGMENT WORD PUBLIC 'DATA'
_DATA ENDS
DGROUP GROUP CONST, _BSS, _DATA
ASSUME CS: _TEXT, DS: DGROUP, SS: DGROUP, ES:DGROUP
_BSS SEGMENT
BUFFER_SIZE EQU 2000D ;THE VIDEO BUFFER SIZE IN WORDS
NUM_BYTES_IN_ROW EQU 80 ;NUMBER OF BYTES IN A ROW
MONOCHROME_SEGADR EQU 0B000H ;ADDRESS OF MONOCHROME BUFFER
GRAPHICS_SEGADR EQU 0B800H ;ADDRESS OF GRAPHICS BUFFER
EVEN
_BSS ENDS
_TEXT SEGMENT
;-------------------------------------------------------------------------------
; CLEAR (ROUTINE 1)
; THIS ROUTINE CLEARS THE SCREEN
; THE C LANGUAGE CALL IS:
; CLEAR();
; THE ASSEMBLY CALL IS:
; CALL CLEAR
;-------------------------------------------------------------------------------
PUBLIC _clear
_clear PROC NEAR
PUSH BP ;THE FRAME POINTER
MOV AH,6 ;SCROLL ACTIVE PAGE UP
MOV AL,019H ;CLEAR 25 LINES
MOV CX,0H ;UPPER LEFT OF SCROLL
MOV DX,2479H ;LOWER RIGHT OF SCROLL
MOV BH,7H ;USE NORMAL ATTRIBUTE ON BLANKED LINE
INT 10H ;VIDEO-IO
POP BP ;THE FRAME POINTER
RET
_clear ENDP
;-------------------------------------------------------------------------------
; LOCATE (ROUTINE 2)
; THIS ROUTINE WILL LOCATE THE CURSOR AT A ROW AND COLUMN ON THE SCREEN
; THE C LANGUAGE CALL IS:
; LOCATE(ROW,COLUMN);è; THE ASSEMBLY CALL IS:
; MOV DX,COL ;RANGE IS 0 - 79
; PUSH DX
; MOV DX,ROW ;RANGE IS 0 - 24
; PUSH DX
; CALL LOCATE
;-------------------------------------------------------------------------------
PUBLIC _locate
_locate PROC NEAR ;PROC TO LOCATE THE CURSOR
PUSH BP ;THE FRAME POINTER
MOV BP,SP ;POINT TO MOST RECENT STACK ELE
MOV DH,[BP+4] ;GET THE ROW..
MOV DL,[BP+6] ;..AND THE COL
MOV BH,0H ;GRAPHICS PAGE NO.
MOV AH,2H ;SET_CURSOR_POSITION
INT 10H ;VIDEO-IO
POP BP ;THE FRAME POINTER
RET
_locate ENDP
;-------------------------------------------------------------------------------
; CURSIZE (ROUTINE 3)
; THIS ROUTINE SETS THE SIZE OF THE CURSOR
; THE C LANGUAGE CALL IS:
; CURSIZE(START_LINE,STOP_LINE);
; THE ASSEMBLY CALL IS:
; MOV DX,STOP_LINE ;13 IS NORMAL STOP_LINE FOR MONOCHROME ADAPTOR
; PUSH DX
; MOV DX,START_LINE ;12 IS NORMAL START_LINE FOR MONOCHROME ADAPTOR
; PUSH DX
; CALL CURSIZE
;-------------------------------------------------------------------------------
PUBLIC _cursize
_cursize PROC NEAR
PUSH BP ;THE FRAME POINTER
MOV BP,SP ;POINT TO MOST RECENT STACK ELE
MOV CH,[BP+4] ;CURSOR START LINE
MOV CL,[BP+6] ;CURSOR STOP LINE
MOV AH,1H ;SET CURSOR TYPE
INT 10H ;VIDEO-IO
POP BP ;THE FRAME POINTER
RET
_cursize ENDP
;-------------------------------------------------------------------------------
; GET_MODE (ROUTINE 4)
; THIS ROUTINE RETURNS THE CRT MODE IN AL, AND THE NUMBER OF CHARACTER
; COLUMNS ON THE SCREEN IN AH
; THE C LANGUAGE CALL IS: mode_area.value = get_mode();
; WHERE mode_area is defined as:
; union
; {
; int value;
; struct
; {è; char al; /*al EQ 7 is monochrome*/
; char ah; /*number of character columns on the screen*/
; } al_ah;
; } mode_area;
;
; THE ASSEMBLY CALL IS:
; CALL GET_MODE
;-------------------------------------------------------------------------------
PUBLIC _get_mode
_get_mode PROC NEAR
PUSH BP ;THE FRAME POINTER
MOV AX,0 ;CLEAR THE REG
MOV AH,15 ;GET CURRENT VIDEO MODE
INT 10H ;VIDEO-IO
POP BP ;THE FRAME POINTER
RET
_get_mode ENDP
;-------------------------------------------------------------------------------
; SET_VIDEO_ADDRESS (ROUTINE 5)
; THIS ROUTINE IS USED IN SEVERAL OF THE OTHER ROUTINES TO TEST THE VIDEO
; MODE AND TO SET THE CORRECT VIDEO BUFFER ADDRESS (MONOCHROME OR GRAPHICS).
; THE VIDEO BUFFER ADDRESS IS RETURNED IN AX.
; THIS IS AN INTERNAL ROUTINE SO THE C LANGUAGE AND ASSEMBLY LANGUAGE
; CALLS ARE NOT SHOWN IN THIS PROLOGUE.
;-------------------------------------------------------------------------------
SET_VIDEO_ADDRESS PROC NEAR
CALL _get_mode ;GET CRT MODE
CMP AL,7H ;IS IT A MONOCHROME CARD?
JNE ITS_GRAPHICS
MOV AX,MONOCHROME_SEGADR ;MONOCHROME BUFFER SEG ADDR
JMP RETURN
ITS_GRAPHICS: MOV AX,GRAPHICS_SEGADR ;GRAPHICS BUFFER SEG ADR
RETURN: RET
SET_VIDEO_ADDRESS ENDP
;-------------------------------------------------------------------------------
; CALC_VIDEO_OFFSET (ROUTINE 6)
; THIS ROUTINE IS USED BY SEVERAL OF THE ROUTINES TO CALCULATE THE OFFSET
; INTO THE VIDEO BUFFER FOR MOVING CHARACTERS INTO OR FROM THE VIDEO BUFFER.
; DX MUST BE SET TO THE ROW, AND CX MUST BE SET TO THE COLUMN BEFORE THIS
; ROUTINE IS EXECUTED. THE OFFSET IS RETURNED IN AX.
; THIS IS AN INTERNAL ROUTINE SO THE C LANGUAGE AND ASSEMBLY LANGUAGE
; CALLS ARE NOT SHOWN IN THIS PROLOGUE.
;-------------------------------------------------------------------------------
CALC_VIDEO_OFFSET PROC NEAR
MOV AX,NUM_BYTES_IN_ROW ;NUMBER OF BYTES IN ROW
MUL DX ;RESULT IS IN AX
ADD AX,CX ;THE COL
SHL AX,1 ;MULTIPLY BY 2 FOR CHAR/ATTR
RET
CALC_VIDEO_OFFSET ENDP
;-------------------------------------------------------------------------------
; ISRTSTR (ROUTINE 7)
; THIS ROUTINE POSITIONS ITSELF IN THE VIDEO BUFFER, THEN INSERTS A
; NULL-TERMINATED STRING, ALONG WITH AN ATTRIBUTE, DIRECTLY INTO THE VIDEO
; BUFFER
; THE C LANGUAGE CALL IS: ISRTSTR(ROW,COL,STRING,ATTR);
; THE ASSEMBLY CALL IS:
; MOV DX,ATTRIBUTE ;THE ATTRIBUTE BYTE (VALUE OF NORMAL IS 7)
; PUSH DX
; LEA DX,STRING ;GET ADDRESS OF THE STRING
; PUSH DX
; MOV DX,COL ;RANGE IS 0 - 79
; PUSH DX
; MOV DX,ROW ;RANGE IS 0 - 24
; PUSH DX
; CALL ISRTSTR
;-------------------------------------------------------------------------------
PUBLIC _isrtstr
_isrtstr PROC NEAR
PUSH ES
PUSH BP ;THE FRAME POINTER
MOV BP,SP ;POINT TO STACK
MOV DX,[BP+6] ;GET THE ROW
MOV CX,[BP+8] ;GET THE COLUMN
CALL CALC_VIDEO_OFFSET ;CALC OFFSET INTO VIDEO BUFFER
MOV DI,AX ;OFFSET WAS RETURNED IN AX
MOV SI,[BP+10] ;GET THE SOURCE STRING OFFSET
MOV DH,[BP+12] ;GET THE ATTRIBUTE BYTE
CALL SET_VIDEO_ADDRESS ;SET THE MONOCHROME OR GRAPHICS
MOV ES,AX ;..VIDEO BUFFER ADDRESS INTO ES
ISRT_LOOP: MOV DL,BYTE PTR [SI] ;THE CHARACTER TO INSERT
CMP DL,0 ;IS IT END OF STRING?
JE ISRTSTR_EXIT ;EXIT IF END OF STRING
MOV ES:WORD PTR [DI],DX ;MOVE CHAR AND ATTR TO CRT BUF
ADD DI,2H ;POINT TO NEXT CRT BUF LOC
ADD SI,1H ;POINT TO NEXT SORC STRING BYTE
JMP ISRT_LOOP ;GO MOVE ANOTHER WORD
ISRTSTR_EXIT: POP BP ;THE FRAME POINTER
POP ES
RET
_isrtstr ENDP
;-------------------------------------------------------------------------------
; ISRTCNT (ROUTINE 8)
; THIS ROUTINE POSITIONS ITSELF IN THE VIDEO BUFFER, THEN INSERTS
; N BYTES FROM AN ARRAY DIRECTLY INTO THE VIDEO BUFFER, ALONG WITH AN
; ATTRIBUTE BYTE
; THE C LANGUAGE CALL IS:
; ISRTCNT(ROW,COL,STRING,ATTR,NUM_BYTES);è; THE ASSEMBLY CALL IS:
; MOV DX,NUM_BYTES ;THE NUMBER OF BYTES TO BE DISPLAYED
; PUSH DX
; MOV DX,ATTRIBUTE ;THE ATTRIBUTE BYTE (NORMAL VALUE IS 7)
; PUSH DX
; LEA DX,ARRAY ;GET THE CHARACTER ARRAY ADDRESS
; PUSH DX
; MOV DL,COL ;RANGE IS 0 - 79
; PUSH DX
; MOV DL,ROW ;RANGE IS 0 - 24
; PUSH DX
; CALL ISRTCNT
;-------------------------------------------------------------------------------
PUBLIC _isrtcnt
_isrtcnt PROC NEAR
PUSH ES
PUSH BP ;THE FRAME POINTER
MOV BP,SP ;POINT TO STACK
MOV DX,[BP+6] ;GET THE ROW
MOV CX,[BP+8] ;GET THE COLUMN
CALL CALC_VIDEO_OFFSET ;CALC OFFSET INTO VIDEO BUFFER
MOV DI,AX ;OFFSET WAS RETURNED IN AX
MOV SI,[BP+10] ;GET THE SOURCE STRING OFFSET
MOV DH,[BP+12] ;GET THE ATTRIBUTE BYTE
MOV CX,[BP+14] ;GET NUMBER OF BYTES TO INSERT
CALL SET_VIDEO_ADDRESS ;SET THE MONOCHROME OR GRAPHICS
MOV ES,AX ;..VIDEO BUFFER ADDRESS INTO ES
ISRTCNT_LOOP: MOV DL,BYTE PTR [SI] ;THE CHARACTER TO INSERT
MOV ES:WORD PTR [DI],DX ;MOVE CHAR AND ATTR TO CRT BUF
ADD DI,2H ;POINT TO NEXT CRT BUF LOC
ADD SI,1H ;POINT TO NEXT SORC STRING BYTE
LOOP ISRTCNT_LOOP ;GO MOVE ANOTHER WORD
ISRTCNT_EXIT: POP BP ;THE FRAME POINTER
POP ES
RET
_isrtcnt ENDP
;-------------------------------------------------------------------------------
; PUTCHAT (ROUTINE 9)
; WRITES A CHARACTER AND ATTRIBUTE TO THE SCREEN. THE CURSOR DOES NOT MOVE.
; THE C LANGUAGE CALL IS: PUTCHAT(CHARACTER,ATTR);
; THE ASSEMBLY LANGUAGE CALL IS:
; MOV DX,0
; MOV DL,CHARACTER ;THE CHARACTER TO BE DISPLAYED
; PUSH DX
; MOV DL,ATTRIBUTE ;THE ATTRIBUTE TO BE DISPLAYED
; PUSH DXè; CALL PUTCHAT
;-------------------------------------------------------------------------------
PUBLIC _putchat
_putchat PROC NEAR
PUSH BP ;THE FRAME POINTER
MOV BP,SP ;POINT TO STACK
MOV AL,[BP+4] ;THE CHARACTER
MOV BL,[BP+6] ;THE ATTRIBUTE
MOV BH,0H ;DISPLAY PAGE #
MOV CX,1H ;NUMBER OF CHARACTERS TO WRITE
MOV AH,9H ;WRITE CHAR/ATTR AT CURPOS
INT 10H ;VIDEO_IO
POP BP ;THE FRAME POINTER
RET
_putchat ENDP
;-------------------------------------------------------------------------------
; CRTBUF (ROUTINE 10)
; ACCEPTS TWO PARAMETERS:
; 1. SAVE = 0 AND REPLACE = 1.
; 2. THE ADDRESS TO SAVE THE VIDEO BUFFER INTO OR REPLACE THE VIDEO
; BUFFER FROM
; CALLS CRTSAVE TO SAVE THE CRT BUFFER,
; CALLS CRTREPL TO REPLACE THE CRT BUFFER.
; THE C LANGUAGE CALL IS: CRTBUF(SAVE,SAVE_AREA); OR CRTBUF(REPLACE,SAVE_AREA);
; THE ASSEMBLY CALL IS:
; LEA DX,SAVE_AREA ;GET ADDRESS OF SAVE_AREA
; PUSH DX
; MOV DX,0 ;SAVE (MOV DX,1 TO REPLACE)
; PUSH DX
; CALL CRTBUF
;-------------------------------------------------------------------------------
PUBLIC _crtbuf
_crtbuf PROC NEAR
PUSH BP ;THE FRAME POINTER
MOV BP,SP ;POINT TO STACK
MOV DX,[BP+4] ;SAVE/RESTORE INDICATOR
CMP DX,0 ;SAVE THE CRT BUFFER?
JNE RESTORE_IT
SAVE_IT: CALL CRTSAVE
JMP CRTBUF_EXIT
RESTORE_IT: CALL CRTREPL
CRTBUF_EXIT: POP BP ;THE FRAME POINTER
RET
_crtbuf ENDP
;-------------------------------------------------------------------------------
; CRTSAVE (ROUTINE 11)
; THIS ROUTINE IS CALLED BY CRTBUF TO SAVE THE CRT BUFFER INTO A SAVE AREA.
;
;-------------------------------------------------------------------------------
CRTSAVE PROC NEAR
PUSH ES ;ES AND DS ARE MODIFIED..
PUSH DS ;..SO SAVE THEM
PUSH BP ;SAVE THE FRAME POINTER
MOV BP,SP ;ADDRESS THE STACK
MOV CX,DS ;DATA SEG IS THE DESTINATION
MOV ES,CX ;ES HAS DESTINATION SEG ADDR
MOV DI,[BP+14] ;DESTINATION OFFSET
MOV CX,BUFFER_SIZE ;THE BUFFER SIZE IN WORDS
CALL SET_VIDEO_ADDRESS ;SET THE MONOCHROME OR GRAPHICS
MOV DS,AX ;..VIDEO BUFFER ADDRESS INTO DS
MOV SI,0 ;SOURCE OFFSET
CLD ;SET DF=0 TO MOVE FORWARD
REP MOVSW ;MOVE 2000 WORDS
;THE FRAME POINTER
POP BP ;MUST RESTORE DS..
POP DS ;..AND ES
POP ES
RET
CRTSAVE ENDP
;-------------------------------------------------------------------------------
; CRTREPL (ROUTINE 12)
; THIS ROUTINE IS CALLED BY CRTBUF TO REPLACE THE CRT BUFFER FROM A SAVE AREA.
;
;-------------------------------------------------------------------------------
CRTREPL PROC NEAR
PUSH ES ;ES IS MODIFIED, SO SAVE IT
PUSH BP ;SAVE THE FRAME POINTER
MOV BP,SP ;ADDRESS THE STACK
MOV SI,[BP+12] ;SOURCE OFFSET
CALL SET_VIDEO_ADDRESS ;SET THE MONOCHROME OR GRAPHICS
MOV ES,AX ;..VIDEO BUFFER ADDRESS INTO ES
MOV DI,0 ;DESTINATION OFFSET
;DS HAS SOURCE SEG ADDR
MOV CX,BUFFER_SIZE ;THE BUFFER SIZE IN WORDS
CLD ;SET DF=0 TO MOVE FORWARD
REP MOVSW ;MOVE 2000 WORDS
POP BP ;THE FRAME POINTER
POP ES ;MUST RESTORE ES
RET
CRTREPL ENDP
;-------------------------------------------------------------------------------
; SCANCRT (ROUTINE 13)
; POSITIONS ITSELF IN THE CRT BUFFER, THEN MOVES N BYTES, NOT NULL-TERMINATED,
; TO THE ADDRESS OF AN ARRAY PROVIDED BY THE CALLER.
;
; THE C LANGUAGE CALL IS: SCANCRT(ROW,COL,STRING,NUM_BYTES);
; THE ASSEMBLY CALL IS:
; MOV DX,NUM_BYTES ;THE NUMBER OF BYTES TO MOVE
; PUSH DX
; LEA DX,ARRAY ;GET CHARACTER ARRAY ADDRESS
; PUSH DX
; MOV DX,COL ;RANGE IS 0 - 79
; PUSH DX
; MOV DX,ROW ;RANGE IS 0 - 24
; PUSH DX
; CALL SCANCRT
;-------------------------------------------------------------------------------
PUBLIC _scancrt
_scancrt PROC NEAR
PUSH ES ;ES IS MODIFIED, SO SAVE IT
PUSH BP ;THE FRAME POINTER
MOV BP,SP ;POINT TO STACK
MOV DX,[BP+6] ;GET THE ROW
MOV CX,[BP+8] ;GET THE COLUMN
CALL CALC_VIDEO_OFFSET ;CALC OFFSET INTO VIDEO BUFFER
MOV DI,AX ;OFFSET WAS RETURNED IN AX
MOV SI,[BP+10] ;GET THE SOURCE STRING OFFSET
MOV CX,[BP+12] ;NUMBER OF BYTES TO MOVE
CALL SET_VIDEO_ADDRESS ;SET THE MONOCHROME OR GRAPHICS
MOV ES,AX ;..VIDEO BUFFER ADDRESS INTO ES
SCAN_LOOP: MOV DL,ES:BYTE PTR [DI] ;GET CHAR FROM CRT BUFFER
MOV BYTE PTR[SI],DL ;MOVE CHAR TO STRING IN CALLER
ADD DI,2H ;POINT TO NEXT CRT_BUF LOC
ADD SI,1H ;POINT TO NEXT DEST STRING BYTE
LOOP SCAN_LOOP
SCANCRT_EXIT: POP BP ;THE FRAME POINTER
POP ES ;MUST RESTORE ES
RET
_scancrt ENDP
_TEXT ENDS
END
