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added on the 2025-04-23 15:35:18 by orac81  |
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//This is the TurboC version source. (144 bytes)
Code:
/* MAGIXFLY.C - Tiny MSDOS 3d flying effect demo in 144 bytes.
(C) A.Millett 2012-2025. Released as free software under GNU GPL3 license.
(See: www.gnu.org/licenses/gpl-3.0.html )
Simple demo of ultra-small compilation using TurboC 3.
To compile: tctiny.bat tc3path magixfly
ie: tctiny \m\tc3\bin magixfly
(needs MASM and exe2bin, or TASM)
*/
#include "tctiny.c"
unsigned char far *pVdu;
unsigned int frame; /* Frame count */
void main()
{
register unsigned int x;
unsigned int y;
unsigned int calcy;
IO_VIDEOMODE (0x13); /* Set VGA video mode 13h 320x200x256 */
do {
pVdu = (char far *) ((long) 0xa0000000L);
for (y=10; y<210; y++) {
calcy = ((2560/y) + frame) ;
for (x=320; x; x --) {
*pVdu = (BYTE) (((((x<<4)/y) ^ calcy) + (frame >> 8)) & 31) ;
pVdu ++;
}
}
frame ++;
IO_GETKEY (x); /* See if ESC key hit */
} while (x == 0);
}
Welcome to the playground:)
Youi might want to check 32 bytes versions of
Tilted scrolling plane effects
Platforms 32b
Floorcast 32b
Youi might want to check 32 bytes versions of
Tilted scrolling plane effects
Platforms 32b
Floorcast 32b
Welcome!
Here's how to make the code 51 bytes without changing very much how it works, just switching some registers:
Here's how to make the code 51 bytes without changing very much how it works, just switching some registers:
Code:
; es:di = pixel address, bx=time, bp=y, cx=x
OFFSETY equ 12
org 100h
mov al,19
int 10h
push 0A000h
pop es
reloop:
mov bp,OFFSETY
loopY:
inc bp
mov ax,0A00h
cwd ; dx=0 (ax=2560)
div bp
add ax,bx
xchg ax,si
mov cx,320
loopX:
imul ax,cx,16
cwd ; dx=0 (ax<=5120)
div bp
xor ax,si
add al,bh
and al,31
stosb
test di,di
loopnz loopX
jnz loopY
; di=0 after the loop
inc bx
mov ah,1
int 16h
je reloop
ret
Ha! That brilliant Hellmood, I will add your version to the zip.
There is another 4 bytes saved if its no exit, so thats 47 bytes. I wonder how low it can go? :-)
There is another 4 bytes saved if its no exit, so thats 47 bytes. I wonder how low it can go? :-)
sorry i mean rrrola..
I will add a thumbs up for rrrola's improvements! One downside of that is the addition of imult. it uses an imult/div on each pixel, which is slow on an 8088. A solution is to precalc x*16/y for the whole screen, then just use a lookup, xor, add, and to gen the pixel. of course it makes the demo much bigger.
I have updated the demo. This version (MAGIXFLY.COM) now runs on a real 8086, the previous version needed v20/286. Its now 54 bytes long Also added MAGIXNOX.COM no exit version (47 bytes), and a CGA version MAGIXCGA.COM.
smooth. and as they said: welcome to the playground!
Nice!
submit changes
if this prod is a fake, some info is false or the download link is broken,
do not post about it in the comments, it will get lost.
instead, click here !
---------------------------------------------------------------------------
Released as free/open software under the terms of the GNU GPL3 license.
See: www.gnu.org/licenses/gpl-3.0.html
This is an old-school DOS/VGA graphics demo program.
It gives the (classic) effect of flying over a changing landscape.
The x86 assembler source code (MAGIXFLY.ASM) is included, and there
are comments with suggestions for changes, if you want to experiment.
It can run on an 8086 (or later) PC with VGA under MSDOS/Freedos.
An FPU is not needed.
For modern PCs, it will run on Linux/Windows in DOSBOX, or other emulators.
To run, boot DOS and type:
MAGIXFLY.COM <ENTER>
Hit ESC to exit the demo. Type CLS or MODE 80 to return to 80 col display.
All variables held in registers, which makes the code smaller/faster.
AX,DX,SI are temp calc regs.
DS (data seg) points to VGA screen (A000h)
BX = Pixel position for plotting.
CX = time (frame count)
DI - Y position (for fx calc)
BP = X position (for fx calc)
It uses the open source NETWORK x86 assembler, NASM, but can easily be adapted to others.
Build with: NAS2COM magixfly
or NASM -f bin magixfly.asm -o magixfly.com
Also included on the TurboC folder is a C version compiled with
my TCTINY build util, the exe is only 144 bytes.
The demo isnt wildly new/original, but does have a few little ideas of its own,
and it all neatly fits into 63 bytes. Enjoy!