More VGA tests
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Jeff Parsons
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327
tests/pc/vga/L27-2.ASM
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327
tests/pc/vga/L27-2.ASM
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; Program to illustrate one use of write mode 2 of the VGA and EGA by
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; drawing lines in color patterns.
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;
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; Assemble with MASM or TASM
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;
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; By Michael Abrash
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;
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Stack segment para stack 'STACK'
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db 512 dup(0)
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Stack ends
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SCREEN_WIDTH_IN_BYTES equ 80
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GRAPHICS_SEGMENT equ 0a000h ;mode 10 bit-map segment
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SC_INDEX equ 3c4h ;Sequence Controller Index register
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MAP_MASK equ 2 ;index of Map Mask register
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GC_INDEX equ 03ceh ;Graphics Controller Index reg
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GRAPHICS_MODE equ 5 ;index of Graphics Mode reg
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BIT_MASK equ 8 ;index of Bit Mask reg
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Data segment para common 'DATA'
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Pattern0 db 16
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db 0, 1, 2, 3, 4, 5, 6, 7, 8
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db 9, 10, 11, 12, 13, 14, 15
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Pattern1 db 6
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db 2, 2, 2, 10, 10, 10
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Pattern2 db 8
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db 15, 15, 15, 0, 0, 15, 0, 0
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Pattern3 db 9
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db 1, 1, 1, 2, 2, 2, 4, 4, 4
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Data ends
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Code segment para public 'CODE'
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assume cs:Code, ds:Data
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Start proc near
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mov ax,Data
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mov ds,ax
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mov ax,10h
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int 10h ;select video mode 10h (640x350)
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;
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; Draw 8 radial lines in upper-left quadrant in pattern 0.
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;
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mov bx,0
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mov cx,0
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mov si,offset Pattern0
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call QuadrantUp
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;
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; Draw 8 radial lines in upper-right quadrant in pattern 1.
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;
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mov bx,320
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mov cx,0
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mov si,offset Pattern1
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call QuadrantUp
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;
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; Draw 8 radial lines in lower-left quadrant in pattern 2.
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;
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mov bx,0
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mov cx,175
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mov si,offset Pattern2
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call QuadrantUp
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;
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; Draw 8 radial lines in lower-right quadrant in pattern 3.
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;
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mov bx,320
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mov cx,175
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mov si,offset Pattern3
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call QuadrantUp
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;
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; Wait for a key before returning to text mode and ending.
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;
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mov ah,01h
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int 21h
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mov ax,03h
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int 10h
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mov ah,4ch
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int 21h
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;
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; Draws 8 radial lines with specified pattern in specified mode 10h
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; quadrant.
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;
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; Input:
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; BX = X coordinate of upper left corner of quadrant
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; CX = Y coordinate of upper left corner of quadrant
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; SI = pointer to pattern, in following form:
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; Byte 0: Length of pattern
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; Byte 1: Start of pattern, one color per byte
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;
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; AX, BX, CX, DX destroyed
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;
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QuadrantUp proc near
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add bx,160
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add cx,87 ;point to the center of the quadrant
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mov ax,0
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mov dx,160
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call LineUp ;draw horizontal line to right edge
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mov ax,1
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mov dx,88
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call LineUp ;draw diagonal line to upper right
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mov ax,2
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mov dx,88
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call LineUp ;draw vertical line to top edge
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mov ax,3
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mov dx,88
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call LineUp ;draw diagonal line to upper left
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mov ax,4
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mov dx,161
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call LineUp ;draw horizontal line to left edge
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mov ax,5
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mov dx,88
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call LineUp ;draw diagonal line to lower left
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mov ax,6
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mov dx,88
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call LineUp ;draw vertical line to bottom edge
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mov ax,7
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mov dx,88
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call LineUp ;draw diagonal line to bottom right
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ret
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QuadrantUp endp
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;
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; Draws a horizontal, vertical, or diagonal line (one of the eight
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; possible radial lines) of the specified length from the specified
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; starting point.
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;
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; Input:
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; AX = line direction, as follows:
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; 3 2 1
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; 4 * 0
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; 5 6 7
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; BX = X coordinate of starting point
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; CX = Y coordinate of starting point
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; DX = length of line (number of pixels drawn)
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;
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; All registers preserved.
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;
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; Table of vectors to routines for each of the 8 possible lines.
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;
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LineUpVectors label word
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dw LineUp0, LineUp1, LineUp2, LineUp3
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dw LineUp4, LineUp5, LineUp6, LineUp7
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;
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; Macro to draw horizontal, vertical, or diagonal line.
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;
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; Input:
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; XParm = 1 to draw right, -1 to draw left, 0 to not move horz.
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; YParm = 1 to draw up, -1 to draw down, 0 to not move vert.
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; BX = X start location
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; CX = Y start location
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; DX = number of pixels to draw
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; DS:SI = line pattern
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;
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MLineUp macro XParm, YParm
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local LineUpLoop, CheckMoreLine
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mov di,si ;set aside start offset of pattern
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lodsb ;get length of pattern
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mov ah,al
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LineUpLoop:
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lodsb ;get color of this pixel...
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call DotUpInColor ;...and draw it
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if XParm EQ 1
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inc bx
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endif
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if XParm EQ -1
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dec bx
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endif
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if YParm EQ 1
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inc cx
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endif
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if YParm EQ -1
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dec cx
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endif
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dec ah ;at end of pattern?
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jnz CheckMoreLine
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mov si,di ;get back start of pattern
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lodsb
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mov ah,al ;reset pattern count
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CheckMoreLine:
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dec dx
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jnz LineUpLoop
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jmp LineUpEnd
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endm
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LineUp proc near
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push ax
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push bx
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push cx
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push dx
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push si
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push di
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push es
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mov di,ax
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mov ax,GRAPHICS_SEGMENT
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mov es,ax
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push dx ;save line length
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;
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; Enable writes to all planes.
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;
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mov dx,SC_INDEX
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mov al,MAP_MASK
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out dx,al
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inc dx
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mov al,0fh
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out dx,al
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;
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; Select write mode 2.
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;
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mov dx,GC_INDEX
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mov al,GRAPHICS_MODE
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out dx,al
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inc dx
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mov al,02h
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out dx,al
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;
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; Vector to proper routine.
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;
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pop dx ;get back line length
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shl di,1
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jmp cs:[LineUpVectors+di]
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;
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; Horizontal line to right.
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;
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LineUp0:
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MLineUp 1, 0
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;
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; Diagonal line to upper right.
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;
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LineUp1:
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MLineUp 1, -1
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;
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; Vertical line to top.
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;
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LineUp2:
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MLineUp 0, -1
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;
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; Diagonal line to upper left.
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;
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LineUp3:
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MLineUp -1, -1
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;
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; Horizontal line to left.
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;
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LineUp4:
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MLineUp -1, 0
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;
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; Diagonal line to bottom left.
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;
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LineUp5:
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MLineUp -1, 1
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;
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; Vertical line to bottom.
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;
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LineUp6:
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MLineUp 0, 1
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;
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; Diagonal line to bottom right.
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;
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LineUp7:
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MLineUp 1, 1
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LineUpEnd:
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pop es
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pop di
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pop si
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pop dx
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pop cx
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pop bx
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pop ax
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ret
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LineUp endp
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;
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; Draws a dot in the specified color at the specified location.
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; Assumes that the VGA is in write mode 2 with writes to all planes
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; enabled and that ES points to display memory.
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;
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; Input:
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; AL = dot color
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; BX = X coordinate of dot
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; CX = Y coordinate of dot
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; ES = display memory segment
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;
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; All registers preserved.
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;
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DotUpInColor proc near
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push bx
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push cx
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push dx
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push di
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;
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; Point ES:DI to the display memory byte in which the pixel goes, with
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; the bit mask set up to access that pixel within the addressed byte.
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;
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push ax ;preserve dot color
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mov ax,SCREEN_WIDTH_IN_BYTES
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mul cx ;offset of start of top scan line
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mov di,ax
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mov cl,bl
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and cl,111b
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mov dx,GC_INDEX
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mov al,BIT_MASK
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out dx,al
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inc dx
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mov al,80h
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shr al,cl
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out dx,al ;set the bit mask for the pixel
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shr bx,1
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shr bx,1
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shr bx,1 ;X in bytes
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add di,bx ;offset of byte pixel is in
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mov al,es:[di] ;load latches
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pop ax ;get back dot color
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stosb ;write dot in desired color
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pop di
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pop dx
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pop cx
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pop bx
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ret
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DotUpInColor endp
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Start endp
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Code ends
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end Start
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