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Assembly Source File | 1994-03-20 | 28.5 KB | 995 lines

;************************************************************************ ;* * ;* TPLAS.ASM - Generate a Plasma fractal of 320x200 dimensions * ;* and display on screen. * ;* * ;* This is a working prototype of what will become TomsPlas. At * ;* that point, the fractal will be twice the size of the screen * ;* (640x480), allowing greater movement in the window, and the * ;* window will be expanded to much more of the screen (perhaps * ;* all?). Controls will be added to vary the speed (1-9 the * ;* number of frames to skip to speed it up, +/- a delay factor.) * ;* The code itself will be optimized to eliminate repetitive * ;* code, such as a push right before a pop, from the macros. * ;* Also, the movement and palette generation routines should * ;* be moved into the function itself rather than in the data * ;* file. This would shrink the data file to exactly 65,536 * ;* bytes, all of which would be numbers for the random series. * ;* * ;* All code and original algorithms expressed herein, * ;* Copyright (C) 1994 by Tom Dibble * ;************************************************************************ .MODEL TINY ; always must be TINY model for .COM ... LOCALS ;<<Macros>> Screen_MaxX equ 320 Screen_MaxY equ 240 ; PrintNum(n) ; Print a decimal number to the screen using DBuf and INT 21h:09h ; Prints number up to 1000 PrintNum MACRO n LOCAL @@PosNum push ax push bx push cx push dx push di xor bx,bx mov di,offset DBuf mov ax,n cmp ax,0 jg @@PosNum neg ax mov [di+0], BYTE PTR '-' inc bx @@PosNum: xor dx,dx mov cx,1000 div cx add ax,48 ; convert whole # to ASCII mov [di+bx],al inc bx mov ax,dx ; put remainder in ax xor dx,dx mov cx,100 div cx add ax,48 ; convert whole # to ASCII mov [di+bx],al inc bx mov ax,dx ; put remainder in ax xor dx,dx mov cx,10 div cx add ax,48 ; convert whole # to ASCII mov [di+bx],al inc bx mov ax,dx ; put remainder in ax add ax,48 ; convert whole # to ASCII mov [di+bx],al inc bx mov ax,dx ; put remainder in ax inc bx mov [di+bx], BYTE PTR 10 ; CR inc bx mov [di+bx], BYTE PTR 13 ; LF inc bx mov [di+bx], BYTE PTR '$' ; terminate string mov ah,09h mov dx,offset DBuf int 21h pop di pop dx pop bx pop cx pop ax endm ; GetPoint(x,y) ; Get the point in DS:[plasma] and place it in AL ; x and y can not be any of the following: AX, BX, CX GetPoint MACRO x,y push bx ; So we have some regs to play with push cx ; push ds mov bx, y mov cx, bx ; multiply by (320) [256+64 == <<8 + <<6] xchg bh, bl ; shl cx, 6 ; add bx, cx ; add bx, x mov ds, [Plasma] ; DS --> (0,0) in Plasma mem block mov al, [bx] ; Get the damned byte pop ds pop cx pop bx endm ; SetPoint(x,y) ; Set the point in DS:[plasma] to value in AL SetPoint MACRO x,y push bx ; So we have some regs to play with push cx ; push ds mov bx, y mov cx, bx ; multiply by (320) [256+64 == <<8 + <<6] xchg bh, bl ; (mov low into high, same as shl bx, 8) shl cx, 6 ; add bx, cx ; add bx, x mov ds, [Plasma] ; DS --> (0,0) in Plasma mem block mov [bx], al ; Set the damned byte pop ds ; DS --> Data push ds mov ds, [Video] ; DS --> Video mem block mov [bx], al ; Put this bitch on screen! pop ds pop cx pop bx endm ; SubDivide x1, y1, x2, y2 ; Subdivide a Plasma rectangle defined by given coordinates and recurse. SubDivide MACRO x1,y1,x2,y2 mov ax,y2 push ax mov ax,x2 push ax mov ax,y1 push ax mov ax,x1 push ax call SubDiv endm ; Adjust x1, y1, x2, y2, xm, ym ; Adjust point (x,ym) to average of (x,y1) and (x,y2) plus a random val. ; Adjust MACRO x1, y1, x2, y2, xm, ym mov ax, ym push ax mov ax, xm push ax mov ax, y2 push ax mov ax, x2 push ax mov ax, y1 push ax mov ax, x1 push ax call Adj endm ; Rand8 ; Get the next 8-bit random value from Rand_Series. Put it into AL. Rand8 MACRO push ds mov bx, Rand_Ptr mov ds, [Rand_Series] mov al, [bx] pop ds inc Rand_Ptr endm ; Rand16 ; Get the next 16-bit random value from Rand_Series. Put it into AX. Rand16 MACRO push ds mov bx, Rand_Ptr mov ds, [Rand_Series] mov ax, [bx] pop ds inc Rand_Ptr inc Rand_Ptr endm ; GetTRand ; Get System-Time 'seconds' and '1/100 seconds' into DH and DL, respectively ; 'hour' and 'minute' into CH and CL, respectively GetTRand MACRO push ax mov ah, 2Ch ; DOS Interrupt Fn: 'Get System Time' int 21h pop ax endm ; malloc: allocate memory to program in 16-byte chunks ; 'amount' is the number of 'paragraphs' to allocate ; (a paragraph being 16 bytes). ; CF set on error, AX is 09h, BX is size of largest block ; The segment address is left in AX if successful malloc MACRO amount mov ah,48h mov bx,amount int 21h endm ; mfree: frees malloc'd memory. mfree MACRO where mov ah,49h mov es,where int 21h endm ; keyp: check for key press ; CF set if key is present. keyp MACRO mov ah,0bh int 21h or al,al endm ; kwait: wait for key-press kwait MACRO push ax mov ah, 08h int 21h pop ax endm ; exit: exit with error code exit MACRO return_code mov al,return_code mov ah,4ch int 21h endm ; prints: print a string to text screen prints MACRO str mov ah,09h mov dx,offset str int 21h endm ; fopen: open a file for read (0) or write (1) or both (2) ; CF set on error, AX holds error code. ; file handle left in AX if successful. fopen macro file,attrib mov ah,3dh mov al,attrib mov dx,offset file int 21h endm ; fread: read information from file opened by fopen. ; Data read into (AX:00h). ; CF set on error. ; AX return (number of bytes read) is nuked. fread macro handle,bytes push ax push ds push ax mov ah,3fh mov bx,[handle] mov cx,bytes xor dx,dx ; Segment is (00h) pop ds ; this used to be AX! int 21h pop ds pop ax endm ;**************************** << CODE SEGMENT >> ****************************; .CODE org 100h start: jmp begin ; Variables ; Strings CopyRight db "Tom's Plasma (C) 1994 by Tom Dibble",10,13,"$" TPVersion db "Revision 1.1, March 19, 1994",10,13,"$" NoMemory db "Out of Base Memory!",10,13,"$" NoFile db 10,13,\ "ERROR: Couldn't open TomsPlas.DAT!",10,13,\ " Change to the directory containing",10,13,\ " TomsPlas.DAT and restart the program!",10,13,"$" DebugPoint db "Debug Point!",10,13,"$" DataFile db "TOMSPLASM.DAT",0 DBuf db 80 dup (?) ; General Variables OrigVMode db 03h ; Mode the video card was in when we got here! recadj db 11111111B ; last 8 bits set (255) count dw 0 ; loop counter while swimmin' and cyclin' DATHandle dw ? ; Handle to Data File Rand_Ptr dw ? ; Pointer to next random value in [Rand_Series] WinHide db 0 ; Is the swim-window hidden? ; Segment Addresses Plasma dw 0 ; Segment beginning for Plasma Bitmap Video dw 0 ; Segment beginning for Video Memory Color dw 0 ; Segment for Color-Palette Data Movement dw 0 ; Movement data Rand_Series dw 0 ; 64k of random values ASSUME CS:@code,DS:@code,ES:@code .386 ; select the processor begin: ; from here on in is executable stuffs ... mov sp,offset stacktop ; set new stack mov bx,last_inst-start+100h ; (size of prog. + 100h header) shr bx,4 ; shrink memory usage to program size inc bx ; in pages (16 bytes) mov ah,4ah int 21h ; ES segment is resized. ES is set to @code prints CopyRight ; display header message prints TPVersion ; display header message, part 2 ; InitProgram sets video mode, allocates memory, seeds 'Random' CALL InitProgram ; GenPlasma does all the work mov [recadj], 11111111B ; last eight bits default ('Rough') CALL ClearPlasma NewPlasma: CALL ShowPlasma CALL ClearPlasma CALL GenPlasma ; Cycle the colors and swim the image ContinueCycle: cmp [WinHide],0 jne NoWindow CALL CycleSwim jmp KeyDecipher NoWindow: CALL ShowPlasma CALL CycleNoSwim KeyDecipher: ; Wait for a key to be pressed (if none has already) mov ah, 08h int 21h ; Process that key! cmp al, 13 ; Return --> New Plasma! je NewPlasma cmp al, ' ' ; Space --> Hide Window! je ToggleWindow cmp al, '1' ; New Plasma, recadj of 255 je RoughPlasma cmp al, '2' ; New Plasma, recadj of 127 je MedPlasma cmp al, '3' ; New Plasma, recadj of 63 je SmoothPlasma cmp al,27 ; <Esc> --> Get outta here! je LeaveProg jmp ContinueCycle ToggleWindow: not [WinHide] jmp ContinueCycle ; any key puts the window back! RoughPlasma: mov recadj, 11111111B jmp NewPlasma MedPlasma: mov recadj, 01111111B jmp NewPlasma SmoothPlasma: mov recadj, 00111111B jmp NewPlasma LeaveProg: ; Clean out memory allocated, return to right video mode CALL CleanUp ;Now exit to DOS mov ah,4Ch int 21h ret ;************************************************************************ ;* * ;* InitProgram * ;* * ;* Allocate memory to Plasma, clear it out * ;* Open Data File * ;* Allocate memory to Movement, read * ;* Allocate memory to Color, read * ;* Allocate memory to Rand_Series, read * ;* Get Rand_Ptr from system time function * ;* Set Video Mode to 13 * ;* * ;************************************************************************ InitProgram PROC NEAR malloc 4000+1 ; allocate memory for plasma buffer + 1 para. jc nomem ; break if not enough memory mov [Plasma],ax ; store address malloc 2500+1 ; allocate memory for movement buffer + 1 jc nomem ; as above... mov [Movement],ax malloc 192+1 ; allocate memory for color buffer + 1 jc nomem mov [Color],ax malloc 1000h ; allocate memory for random buffer + 1 jc nomem mov [Rand_Series],ax jmp allocok ; skip the following allocok: fopen DataFile,0 ; open TomsPlas.DAT read only jnc loadok ; prints NoFile ; You schmuck! It's not here! mfree [Plasma] mfree [Movement] mfree [Color] mfree [Rand_Series] exit 254 ; so quit loadok: mov [DATHandle],ax ; store handle mov ax,[Movement] ; read movement data fread DATHandle,40000 mov ax,[Color] ; color data fread DATHandle,3072 mov ax,[Rand_Series] ; and random series fread DATHandle,0ffffh GetTRand ; get 'time' values into CX and DX add cx, dx ; accumulate values mov Rand_Ptr, cx ; put Rand_Ptr as a random place in series mov ax,0F00h ; get the video mode now int 10h ; mov [OrigVMode], al mov ax,0013h ; set video mode 13 int 10h mov [Video],0a000h ; Start segment for Video Mem mov si, 0 mov cx, 3*255 ; Set Color Palette! push ds ; mov ds, [Color] cld mov dx, 03C8h ; mov al, 1 ; start with color '1' out dx, al ; inc dx rep outsb pop ds ret nomem: prints NoMemory exit -1 InitProgram ENDP ClearPlasma PROC NEAR push eax ; push cx ; push es ; Clear out the memory devoted to push di ; the Plasma buffer so that ; we can create a new Plasma! mov ax, 0 ; shl eax, 16 ; mov ax,0 ; mov cx, [Plasma] ; mov es, cx ; mov di, 0 ; mov cx, 64000/4 ; rep stosd ; put eax into es:di ; pop di ; pop es ; pop cx ; pop eax ; ret ClearPlasma ENDP ShowPlasma PROC NEAR push ax push cx push es push ds push si push di mov si,0 mov di,0 mov ax,[Video] mov es,ax mov ds,[Plasma] mov cx, 320*200/4 rep movsd pop di pop si pop ds pop es pop cx pop ax ret ShowPlasma ENDP CleanUp PROC NEAR push ax mfree [Plasma] mfree [Movement] mfree [Color] mfree [Rand_Series] mov ah,00h mov al,[OrigVMode] ; set video mode back to what it was int 10h prints CopyRight ; Tell 'em this again! pop ax ret CleanUp ENDP GenPlasma PROC NEAR Rand8 SetPoint 0,0 Rand8 SetPoint 319, 199 Rand8 SetPoint 0, 199 Rand8 SetPoint 319, 0 SubDivide 0,0,319,199 ret GenPlasma ENDP ;************************************************************************ ;* * ;* SubDiv x1, y1, x2, y2 * ;* * ;* Corners have already been set to proper values. * ;* Check each side if it has been set yet, and if not, * ;* set it to the average of associated corners plus * ;* a random value based on Code:recadj. * ;* Set middle to average of four sides. * ;* Recurse for each of four sectors in lt,rt,rb,lb order. * ;* Free up our memory and get the hell outta here! * ;* * ;* 18 bytes on stack per recursion, times 7 recursions. Stack * ;* size must be large enough to handle this load! * ;* * ;************************************************************************ SubDiv PROC ARG x1:word, y1:word, x2:word, y2:word LOCAL x:word, y:word=LocalStk push bp mov bp,sp sub sp,LocalStk ; Set-up local stack push cx push dx ; First, check for recursion halts. ; < if(xhalt && yhalt) return > mov ax,[x1] add ax,[x2] shr ax,1 ; divide by two for average of x1,x2 mov [x],ax ; now 'x' is on stack! ; Find the 'y' value now! mov cx,[y1] add cx,[y2] shr cx,1 ; divide by two for average of y1,y2 mov [y],cx ; now 'y' is on stack! cmp ax,[x1] jg xchecks ; if x1 != x, keep on going ; x does not check. ; Check for 'y' value recursion halt. cmp cx,[y1] jg ychecks ; y checks. Jump out. pop dx ; Cleanup: return DX, to it's place pop cx ; and same with CX, SP and BP ... mov sp,bp ; pop bp ; ret 8 xchecks: ychecks: ; Okay! We have checked for recursion halt ; and have calculated x and y. ; Next, check each of the four sides for empty ; and call 'Adjust' if so. Meanwhile, keep ; a running total of all the four sides so we ; can do a quick average of them in the next ; step. GetPoint [x],[y1] cmp al,0 jne topgood Adjust [x1],[y1],[x2],[y1],[x],[y1] topgood: mov ah,0 push ax GetPoint [x2],[y] cmp al,0 jne rightgood Adjust [x2],[y1],[x2],[y2],[x2],[y] rightgood: mov ah,0 pop bx add ax,bx push ax GetPoint [x],[y2] cmp al,0 jne bottomgood Adjust [x1],[y2],[x2],[y2],[x],[y2] bottomgood: mov ah,0 pop bx add ax,bx push ax GetPoint [x1],[y] cmp al,0 jne leftgood Adjust [x1],[y1],[x1],[y2],[x1],[y] leftgood: mov ah,0 pop cx add cx,ax ; No push of AX here! ; Okay. All four side pixels have been computed ; and plotted on the screen and in memory. AX ; holds the sum of all four pixels. Divide by four ; and set x,y to the resulting value. shr cx,2 mov al,cl SetPoint [x],[y] ; Finally. All the real work is done. Now, decrease ; the recurse-level adjustment and recurse down ; to the next level for each of the four quads mov al, recadj push ax shr al, 1 mov recadj, al SubDivide [x1], [y1], [x], [y] SubDivide [x], [y1], [x2], [y] SubDivide [x], [y], [x2], [y2] SubDivide [x1], [y], [x], [y2] pop ax mov recadj, al ; return it to what it was before we got here. pop dx ; Cleanup: return DX, to it's place pop cx ; and same with CX, SP and BP ... mov sp,bp ; pop bp ; ret 8 SubDiv ENDP ;************************************************************************ ;* * ;* Adj x1, y1, x2, y2, x, y * ;* * ;* Sets the point at (x,y) to be the average of points (x1,y1) * ;* and (x2,y2), plus a random factor based on recval. * ;* * ;* Get points (1) and (2) into AH, AL. * ;* Average the values into AL. * ;* CBW AL, move into BX. * ;* Get a random 16-bit number into AX * ;* Multiply AX and recval. * ;* Shift DX to the right 2 bits (same as shifting 32-bit 18) * ;* Move DX into AX * ;* Add BX into AX * ;* if AX < 1, AX = 1. * ;* if AH != 0, AL = 255 * ;* Set point (x,y) to value in AL. * ;* * ;************************************************************************ Adj PROC NEAR ARG x1:word, y1:word, x2:word, y2:word, xm:word, ym:word push bp mov bp, sp push bx push cx push dx mov ah,0 GetPoint [x1], [y1] ; Sets 'AL' mov cl, al ; Put it into 'CL' GetPoint [x2], [y2] ; Sets 'AL' add cx, ax ; Add this guy to the first. shr cx, 1 ; Divide by two (to make average) Rand8 ; random byte in al mov bl, recadj and al, bl ; restrict the rand # shr bl, 1 ; div by 2 sub al, bl ; subtract 1/2 (so low # neg, high pos) cbw add ax, cx ; cx is pos. ax may be + or - ; If the sum exceeded 255, ah will ; have a positive number in it. ; If the sum was less than zero, ax ; will be negative. cmp ax,0 jg AdjLowCheck mov ax,1 ; ax < 0, force it to lower bound! jmp AdjSetPoint AdjLowCheck: cmp ax,256 jl AdjSetPoint mov ax,255 ; ax > 255, force it to upper bound! AdjSetPoint: SetPoint [xm], [ym]; Set (x,y) to 'AL' pop dx pop cx pop bx pop bp ret 12 ; 6*2 parameters Adj ENDP ;************************************************************************ ;* * ;* CycleSwim * ;* * ;* Cycle the color palette and swim a middle window of plasma. * ;* * ;* 'Swimming' is the process of adding two sections of the * ;* plasma fractal together, then moving the pointers * ;* to each of those sections in a loop so as to create * ;* a composite, changing fractal. * ;* * ;************************************************************************ CycleSwim PROC NEAR mov ax, [Video] ; Put the video segment address in es mov es, ax ; for stosd loop below. mainloop: ; We'll do all this setup stuff *BEFORE* we wait for VRT. ; This sets things up for :setpl: loop below ... ; Rotate the palette! push ds push es cld mov es, [Color] mov ds, [Color] mov bx, 0 mov ax, [bx] ; r,g of color[0] mov dl, [bx+2] ; b of color[0] mov cx, 256*3 ; loop 256*4*3/4 times mov si, 3 mov di, 0 rep movsd ; move bytes from ds:si to es:di mov bx, 256*4*3-3 ; copy saved rgb to end of current pal. mov [bx],ax mov [bx+2],dl pop es pop ds mov si,0 mov cx,255*3 ; loop 255 times (for 255 DAC's) push ds mov ds,[Color] ; address segment cld ; ensure SI is incremented VSync: mov dx,03dah ; VGA input status register 1 in al,dx ; load value test al,08 ; vertical retrace?? je VSync ; if not, try again... ; Load all the info from the colour segment ; into the DAC's ... ; NOW do the final prep for color loading mov dx,3c8h ; DAC index register mov al,1 ; start with color 1 out dx,al ; and load inc dx ; DAC read/write register rep outsb pop ds ; and restore DS back to code segment mov di,[count] ; source = count * 4 shl di,2 ; push ds mov ds,[Movement] ; get segment address of movement data mov si,[di] ; load point 1, start of reading x-data mov bx,[di+2] ; load point 2, start of added x-data pop ds ; and restore DS back to code segment push ds mov ds,[Plasma] ; get segment of start of plasma mov di,320*50+90 ; put window in the center of the screen. mov ch,100 ; y loop = 100 pixels pl1: mov cl,40 ; x loop = 40 * 4 = 160 pixels pl2: lodsd ; get 4 source pixels from ds:si, inc si add eax,[si+bx] ; add 4 source pixels from ds:(si+bx) stosd ; and store them on screen to es:di, inc di dec cl ; dec x-counter jnz pl2 ; and loop.. sub si,160 ; reset source to beg. of :pl1: mov dx,ds ; add 20 to DS : add dx,20 ; move 20*16 = 320 bytes down in source mem mov ds,dx add di,160 ; add 160 to vid ptr (to beg of next line) dec ch ; dec y-counter jnz pl1 ; and loop.. pop ds ; and restore DS back to code segment inc word ptr [count] ; increase counter cmp word ptr [count],10000 ; reset it at end of cycle jne noreset mov word ptr [count],0 noreset: keyp ; keypressed?? jnz closedown ; if yes then quit.. jmp mainloop closedown: ret CycleSwim ENDP ;************************************************************************ ;* * ;* CycleNoSwim * ;* * ;* Just cycle the color palette. * ;* * ;************************************************************************ CycleNoSwim PROC NEAR mov ax, [Video] ; Put the video segment address in es mov es, ax ; for stosd loop below. CNSmainloop: ; We'll do all this setup stuff *BEFORE* we wait for VRT. ; This sets things up for :setpl: loop below ... ; Rotate the palette! push ds push es cld mov es, [Color] mov ds, [Color] mov bx, 0 mov ax, [bx] ; r,g of color[0] mov dl, [bx+2] ; b of color[0] mov cx, 256*3 ; loop 256*4*3/4 times mov si, 3 mov di, 0 rep movsd ; move bytes from ds:si to es:di mov bx, 256*4*3-3 ; copy saved rgb to end of current pal. mov [bx],ax mov [bx+2],dl pop es pop ds push ds mov si,0 mov cx,255*3 ; loop 255 times (for 255 DAC's) mov ds,[Color] ; address segment cld ; ensure SI is incremented CNSVSync: mov dx,03dah ; VGA input status register 1 in al,dx ; load value test al,08 ; vertical retrace?? je CNSVSync ; if not, try again... ; Load all the info from the colour segment ; into the DAC's ... ; NOW do the final prep for color loading mov dx,3c8h ; DAC index register mov al,1 ; start with color 1 out dx,al ; and load inc dx ; DAC read/write register rep outsb pop ds ; and restore DS back to code segment keyp ; keypressed?? jnz leaveCNS ; if yes then quit.. jmp CNSmainloop leaveCNS: ret CycleNoSwim ENDP mystack db 8192 dup (?) ; my stack: room for lots o' recursion stacktop equ $ ; top of my stack. last_inst: ; the end of the program! END start