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Collection of Hack-Phreak Scene Programs
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VLA_FONT.ZIP
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HSCR4X.ASM
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Assembly Source File
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1993-09-28
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6KB
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261 lines
IDEAL
DOSSEG
MODEL SMALL
STACK 200h
CODESEG
p386
ASSUME CS:@CODE, DS:@CODE
────────────────────────────────────────────────────────────────────────────
STRUC VCHHDR
Ident db "VLACH"
From db ?
X db ?
Y db ?
NumChar db ?
ENDS
STRUC Pal
R db ?
G db ?
B db ?
ENDS
────────────────────────────────────────────────────────────────────────────
INCLUDE "MODEX.INC"
FileName_VCH db "Font5.VCH",0
FileName_PAL db "Font5.PAL",0
Seg_VCH dw 0
Palette Pal 256 dup (<>)
VCHHEADER VCHHDR <>
CharWidths db 256 dup (0)
TheMessage db " THIS SCROLLER IS NOT HUGE LIKE THE 8X ONE, "
db "BUT IT IS BY NO MEANS TINY. EACH PIXEL IS "
db "CONVIENIENTLY RESIZED TO 4X4 PIXELS THROUGH THE "
db "UTILIZATION OF A FEW KEY ASPECTS OF A STANDARD "
db "VGA CARD... CELL HEIGHT IS SET TO 7.. (THAT'S "
db "8 SCAN LINES PER PIXEL) "
db 0
MsgOff dw offset TheMessage
CharOff dw 0 ;offset to current column to draw of chr
XYsize dw ? ;number of bytes in a char
CurColumn db 1
DestOff dw 0
SCReenWidth = 130
────────────────────────────────────────────────────────────────────────────
────────────────────────────────────────────────────────────────────
; Load in the font named in FileName_VCH and loads in the Palette
; named in FileName_PAL.
;
; Returns CF = 1 if there was an error
────────────────────────────────────────────────────────────────────
PROC LoadFont NEAR
pusha
push ds
mov ax,cs
mov ds,ax
mov dx,offset FileName_PAL ;open the palette file
mov ax,3d00h
int 21h
jc @@Error
mov bx,ax
mov dx,offset Palette ;read in the palette
mov cx,768
mov ah,3fh
int 21h
mov ah,3eh ;close PAL file
int 21h
mov dx,offset FileName_VCH ;open VCH file
mov ax,3d00h
int 21h
jc @@Error
mov bx,ax
mov dx,offset VCHHeader ;load in the header
mov cx,size VCHHDR
mov ah,3fh
int 21h
mov al,[VCHHEADER.X] ;calc data size
mul [VCHHEADER.Y]
mov [XYsize],ax
movzx cx,[VCHHEADER.NumChar]
mul cx
mov cx,ax
mov ax,[cs:SEG_VCH] ;move SEG_VCH into DS, but be sure
or ax,ax ;the segment isn't 0
stc
je @@Error
mov ds,ax
xor dx,dx ;load in the data
mov ah,3fh
int 21h
mov ax,cs
mov ds,ax
mov dx,offset CharWidths
movzx cx,[VCHheader.NumChar]
mov ah,3fh
int 21h ;read in widths of chars
mov ah,3eh ;close VCH file
int 21h
clc
@@Error:
pop ds
popa
ret
ENDP
────────────────────────────────────────────────────────────────────
;Starts the next letter in the message
────────────────────────────────────────────────────────────────────
PROC NewChar NEAR
pusha
push ds
mov ax,cs
mov ds,ax
mov si,[MsgOff] ;get the offset to the next char
@@MsgLoop:
lodsb
or al,al
jne @@IsaChar
mov si,offset TheMessage
jmp short @@MsgLoop
@@IsaChar:
mov ah,[VCHHEADer.From]
add ah,[VCHHEADer.NumChar]
cmp al,[VCHHEADer.FROM]
jb @@MsgLoop
cmp al,ah
ja @@MsgLoop
mov [MsgOff],si
sub al,[VCHheader.From]
movzx ax,al
mov bx,ax
mul [XYsize]
mov [CharOff],ax
mov al,[CharWidths + bx]
mov [CurColumn],al
pop ds
popa
ret
ENDP
────────────────────────────────────────────────────────────────────
; Draws the Next column onto the screen, calls NewChar if done with
; current character
────────────────────────────────────────────────────────────────────
PROC DrawColumn NEAR
pusha
push ds es fs
mov ax,cs
mov ds,ax
mov bx,[DestOff]
add bx,2
@Set_Start_Offset
dec [CurColumn]
jne @@NoNew
call NewChar
@@NoNew:
mov fs,[SEG_VCH]
mov es,[VGASEG]
mov si,[CharOff] ;fs:si points to the data
mov di,[DestOff]
movzx dx,[VCHheader.X]
movzx cx,[VCHheader.Y]
mov bp,SCReenWidth ;screen width
@@Zloop:
mov al,[fs:si]
mov [es:di],al
mov [es:di+SCReenWidth/2],al
add di,bp
; mov [es:di],al
; mov [es:di+SCReenWidth/2],al
; add di,bp
; mov [es:di],al
; mov [es:di+SCReenWidth/2],al
; add di,bp
; mov [es:di],al
; mov [es:di+SCReenWidth/2],al
; add di,bp
add si,dx
loop @@ZLoop
inc [DestOff]
cmp [DestOff],ScreenWidth/2
jb @@okok
mov [DestOff],0
@@okok:
inc [CharOff]
pop fs es ds
popa
ret
ENDP
────────────────────────────────────────────────────────────────────────────
START:
mov ax,cs
mov ds,ax
mov ax,ss
mov bx,sp
add bx,15
shr bx,4
add ax,bx
mov [SEG_VCH],ax
@SetModeX m256x200x256, 520
call LoadFont
mov si,offset Palette
mov cx,256
mov al,0
@WritePalette
mov dx,CRTC_Index
mov al,9
mov ah,7 ;each dot is 8 high
out dx,ax
@@MainLoop:
@FullVertWait
call DrawColumn
mov ah,1
int 16h
jz @@MainLoop
mov ah,0
int 16h
mov ax,3
int 10h
mov ax,4c00h
int 21h
END START