520 lines
11 KiB
NASM
520 lines
11 KiB
NASM
; tinyfrac.asm
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;
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; teeny program displays the Mandelbrot set.
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;
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; written on Sun 03-26-1995 by Ed Beroset (Fidonet 1:3641/1.250)
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;
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; This program was based on a program by Frank Hommers, later optimized
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; for size by Mikko Hyvarinen and posted in Fidonet's 80XXX echo.
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;
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; This new version has many new features and was based on my own
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; optimization of Hyvarinen's version. Some features:
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;
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; pan using the arrow keys, one can navigate the fractal.
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;
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; Home Up PgUp
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; Left Right correspond to 8 obvious directions
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; End Dn PgDn
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;
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; zoom there are now ten levels of magnification available. If the
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; program is assembled with FEATURES defined, the number
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; corresponding to the zoom level (0-9, zero is most zoomed in)
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; is displayed in the upper left hand corner of the screen just
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; before each new fractal is drawn. The gray '+' key zooms out,
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; the gray '-' key zooms in.
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;
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; beep the program will beep at the completion of each fractal
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; drawing or if the user attempts to zoom past either limit.
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;
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; mode if the program is assembled with MODECHANGE defined, the
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; will change to the next video mode if the 'v' key is pressed.
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; This is handy because drawing fractals at high resolution can
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; be very timeconsuming. The user can find an interesting spot
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; in a low res mode and then change to a high res mode to see it
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; more fully rendered.
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;
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; size this whole project was started off as a size optimization
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; exercise, so there have been some rather ugly tradeoffs to
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; sacrifice speed for size.
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;
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; 8086 yes, it runs on an 8086 although only if you leave out either
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; the FEATURES option or the MODECHANGE option and it would be
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; slower and more painful than oral surgery.
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;
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; cost there IS such a thing as a free lunch! This code is hereby
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; released to the public domain by the author.
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;
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;
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; to assemble & link:
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; TASM /m2 tinyfrac (assemble using two pass mode if required)
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; TLINK /Tdc tinyfrac (link Target platform is DOS, COM file)
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;
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;
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PIXWIDTH equ 511
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PIXHEIGHT equ 255
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ZOOMLIMIT equ 13 ; can change to up to 13 for extended zoom in
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; feel free to experiment with the following constants:
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DELTA equ 200 ; the unit of pan movement in pixels
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THRESHOLD equ 7 ; must be in the range of (0,255)
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STARTSCALE equ 5 ; a number from 0 to ZOOMLIMIT, inclusive
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CHAR_COLOR equ 0fh ; white on black background (for PRINTZOOM feature)
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; ************************************************************
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;
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; Menuet header
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use32
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org 0x0
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db 'MENUET01'
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dd 0x01
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dd START
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dd I_END
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dd 0x62000
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dd 0x1000
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dd 0,0
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include 'lang.inc'
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include 'macros.inc'
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STARTX dd 200
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STARTY dd 120
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scaleaddy dd 120
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scaleaddx dd 200
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START:
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call draw_window
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call draw_fractal
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still:
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mov eax,10
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int 0x40
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cmp eax,1
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je red
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cmp eax,2
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je key
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cmp eax,3
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je button
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jmp still
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red:
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call draw_window
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call put_image
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jmp still
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key:
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mov eax,2
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int 0x40
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cmp ah,'e'
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je cycle
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cmp ah,'r'
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je cycle
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jmp no_cycle
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cycle:
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call color_cycle
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jmp still
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no_cycle:
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cmp ah,'q'
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jne no_in
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inc byte [scale]
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mov ebx,[STARTX]
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imul ebx,2
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sub ebx,[scaleaddx]
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mov [STARTX],ebx
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mov ebx,[STARTY]
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imul ebx,2
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sub ebx,[scaleaddy]
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mov [STARTY],ebx
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no_in:
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cmp ah,'w'
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jne no_out
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dec byte [scale]
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mov ebx,[STARTX]
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add ebx,[scaleaddx]
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shr ebx,1
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mov [STARTX],ebx
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mov ebx,[STARTY]
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add ebx,[scaleaddy]
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shr ebx,1
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mov [STARTY],ebx
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no_out:
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cmp ah,130+48
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jne no_up
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sub [STARTY],100
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no_up:
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cmp ah,129+48
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jne no_down
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add [STARTY],100
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no_down:
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cmp ah,128+48
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jne no_left
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sub [STARTX],100
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no_left:
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cmp ah,131+48
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jne no_right
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add [STARTX],100
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no_right:
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call draw_fractal
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jmp still
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button:
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mov eax,17
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int 0x40
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cmp ah,1
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jne no_close
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mov eax,-1
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int 0x40
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no_close:
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cmp ah,2
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jne no_bgr
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mov eax,15 ; bgr 512 x 256
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mov ebx,1
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mov ecx,512
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mov edx,256
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int 0x40
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mov eax,15
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mov ebx,5
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mov ecx,0x1000
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mov edx,0
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mov esi,512*3*256
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int 0x40
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mov eax,15
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mov ebx,3
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int 0x40
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jmp still
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no_bgr:
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cmp ah,3
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jb no_color
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cmp ah,5
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jg no_color
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shr eax,8
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sub eax,3
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imul eax,8
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add eax,8
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not eax
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and eax,11000b
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; sub eax,8
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mov [shlc],al
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call draw_fractal
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jmp still
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no_color:
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jmp still
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color_cycle:
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pusha
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mov ecx,0x08080808
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mov esi,(256/8)*5
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cmp ah,'e'
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je f_out
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mov ecx,-0x08080808
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mov esi,(256/8)*5-1
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f_out:
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newcycle:
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mov edi,0x1000
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newpix:
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mov eax,[edi]
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add eax,ecx
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mov [edi],eax
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add edi,4
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cmp edi,0x1000+512*256*3
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jb newpix
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call put_image
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mov eax,5
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mov ebx,1
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int 0x40
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dec esi
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jnz newcycle
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mov eax,0
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mov edi,0x1000
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mov ecx,512*256*3 / 4 +50
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cld
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rep stosd
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popa
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call draw_fractal
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ret
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; **********************************************************************
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;
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; Tinyfrac
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;
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draw_fractal:
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pusha
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mov eax,4
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mov ebx,15*65536+35
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mov ecx,0xffffff
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mov edx,calc
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mov esi,calcl-calc
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int 0x40
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popa
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pusha
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movzx ebp,word [STARTX]
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movzx edi,word [STARTY]
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; This routine is the fractal drawing engine. It has been
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; optimized for size, sacrificing speed.
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mov cx, PIXHEIGHT ; height of screen in pixels
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sub di,cx ; adjust our Y offset
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@@CalcRow:
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push cx
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; and cl,0x7
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; cmp cl,0
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; jne noim
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; call put_image
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; noim:
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mov cx, PIXWIDTH -1 ; width of screen in pixels
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sub bp,cx ;
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@@CalcPixel:
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push cx ; save the column counter on stack
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xor cx, cx ; clear out color loop counter
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xor bx, bx ; zero i coefficient
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xor dx, dx ; zero j coefficient
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@@CycleColors:
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push dx ; save j value for later
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mov ax, bx ; ax = i
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sub ax, dx ; ax = i - j
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add dx, bx ; dx = i + j
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stc ; one additional shift, please
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call Shifty ; ax = ((i+j)*(i-j)) shifted right
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pop dx ; retrieve our saved value for j
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add ax,bp ; account for base offset...
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cmp ah,THRESHOLD ; Q: is i > THRESHOLD * 256?
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xchg bx,ax ; now swap new i with old i
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jg @@draw ; Y: draw this pixel
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clc ; no additional shifts here, please
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call Shifty ; now dx:ax = old i * j
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xchg dx,ax ;
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add dx,di ; account for base offset...
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inc cl ; increment color
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jnz @@CycleColors ; keep going until we're done
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@@draw:
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xchg ax, cx ; mov color into al
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pop cx ; retrieve our column counter
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pop dx ; fetch row (column already in cx)
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push dx ; must leave a copy on the stack
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xor bx,bx ; write to video page zero
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call put_pixel
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inc bp
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loop @@CalcPixel
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inc di
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pop cx
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loop @@CalcRow
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call put_image
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popa
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ret
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put_image:
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pusha
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mov eax,7
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mov ebx,0x1000
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mov ecx,512*65536+255
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mov edx,10*65536+30
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int 0x40
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popa
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ret
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shlc db 0
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put_pixel:
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pusha
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sub edi,[STARTY]
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sub ebp,[STARTX]
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and edi,0xff
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and ebp,0x1ff
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shl edi,9
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mov ebx,edi ; * 3 - Y
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add edi,ebx
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add edi,ebx
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mov ebx,ebp
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add ebp,ebx
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add ebp,ebx
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add edi,ebp
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mov cl,[shlc]
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mov ebx,0xff
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shl ebx,cl
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add cl,3
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shl eax,cl
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and eax,ebx
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mov [0x1000+edi],eax
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popa
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ret
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;****************************************************************************
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;
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; This routine multiplies AX by DX and shifts the result (in
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; DX:AX) to the right by scale bits (or scale+1 bits if CY is
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; set). The resulting value is left in AX. DX is destroyed.
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;
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;****************************************************************************
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Shifty:
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push cx ; save middle bits (i*i - j*j)
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db 0b1h ; code for mov cl,immed8
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scale db STARTSCALE
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adc cl,0 ; adjust per CY flag
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imul dx ; do the multiply
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xchg ax,dx ;
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shl eax,16 ; put hi part in hi 16 bits
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xchg ax,dx
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shr eax,cl ;
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pop cx ;
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ret ;
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; **********************************************************************
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;
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; WINDOW DEFINITIONS AND DRAW
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;
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; **********************************************************************
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draw_window:
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pusha
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mov eax,12
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mov ebx,1
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int 0x40
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mov eax,0
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mov ebx,50*65536+531
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mov ecx,100*65536+256+48
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mov edx,0x02334455
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mov esi,0x80778899
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mov edi,0x00778899
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int 0x40
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mov eax,8
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mov ebx,(531-19)*65536+12
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mov ecx,5*65536+12
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mov edx,1
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mov esi,0x808080
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int 0x40
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mov eax,8
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mov ebx,300*65536+112
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mov ecx,5*65536+12
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mov edx,2
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mov esi,0x808080
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int 0x40
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mov ebx,430*65536+12
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mov ecx,5*65536+12
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mov edx,3
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mov esi,0xa00000
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mov edi,3
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newcolor:
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mov eax,8
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int 0x40
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add ebx,13*65536
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shr esi,8
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inc edx
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dec edi
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jnz newcolor
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mov eax,4
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mov ebx,8*65536+8
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mov ecx,0xffffff
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mov edx,l
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mov esi,ll-l
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int 0x40
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mov eax,12
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mov ebx,2
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int 0x40
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popa
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ret
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; ***************************************************************
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;
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; DATA AREA
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;
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l: db 'TINYFRAC - MOVE: ARROWS, ZOOM Q/W, CYCLE: E/R '
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db 'SET AS WALLPAPER'
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ll:
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calc db 'CALCULATING'
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calcl:
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I_END:
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