Time for a contest? Simplest maze-like printing..

[petersieg]

I like simple code, that does (un)expected, but still interesting/nice things

From C64 (and probably a dozen more retro computer languages), exist a very nice writeup about a one line basic program, that basically just prints out a slash and a backslash randlomly and endless and therefore produces a maze like picture.

Links:
Homapage: https://10print.org/
PDF: https://10print.org/10_PRINT_121114.pdf (BY-NC-SA 3.0)
Video: https://www.youtube.com/watch?v=B-Cky_2l11U

So I quickly wrote one in glcc (v0) and one that uses two colors (v1). (laby.zip)
(I switched to output < and >, because the(back)slash does not look that nice with Gigatron char set at the moment)
I also tried myself in gtbasic. (laby_gbas.zip)

I am sure, both can be optimized in size and probably also speed.
And one can do even 'better' in gcl, assembler - you name it.
And possible draw bitmaps/sprites instead of simple chars.

So, who is next?

Who can make the smallest gt1?
Who the most beautiful one?

Anyone, have fun if you like

best, Peter

[lb3361]

This one prints slashes/backslashes in 8x8 squares, avoiding the console and the default font.
Writing the same in GCL or GASM would probably cut the gt1 size by a factor of two or so.

Compile with

Code: Select all

glcc -map=32k -rom=v5a TSTmaze.c -o TSTmaze.gt1 --no-runtime-bss-initialization

TSTmaze.gt1

(714 Bytes) Downloaded 460 times

TSTmaze.c

(803 Bytes) Downloaded 441 times

maze2.png (15.25 KiB) Viewed 9647 times

Code: Select all

#include <gigatron/sys.h>
#include <gigatron/console.h>

char * __near addr = 0;

void print_fslash(void)
{
	int b;
	for (b = 1; (char)b; b <<= 1, addr++) 
		SYS_VDrawBits(CONSOLE_DEFAULT_FGBG, b, addr); 
}

void print_bslash(void)
{
	int b;
	char *p = addr + 8;
	addr = p;
	for (b = 1; (char)b; b <<= 1) 
		SYS_VDrawBits(CONSOLE_DEFAULT_FGBG, b, --p);
}

void scroll(void)
{
	byte *p = videoTable;
	byte x = *p;
	addr = (char*)(x << 8);
	for(; p != videoTable + 112 * 2; p += 2)
		p[0] = p[16];
	for(; p != videoTable + 120 * 2; p += 2, x++)
		p[0] = x;
}

void main(void)
{
	while(1) {
		if (addr == 0) {
			scroll();
			_console_clear(addr, CONSOLE_DEFAULT_FGBG, 8);
		}
		if ((int) SYS_Random() < 0)
			print_fslash();
		else
			print_bslash();
		if ((char)(unsigned)addr == 160)
			addr = 0;
	}
}

[lb3361]

GCL version of the same. ROMv5a and above only because it uses opcode CALLI.

Only 188 bytes. I don't think GLCC will ever match this.

maze.gcl

(803 Bytes) Downloaded 446 times

maze.gt1

(188 Bytes) Downloaded 441 times

Code: Select all

gcl0x

160 addr=
[do
  <addr, 160- [if=0 \scroll!]
  \SYS_Random_34 _sysFn= 34!!
  [if<0 \print_fslash! else \print_bslash!]
loop]

{ Print a forward slash }
[ _print_fslash=*
  \SYS_VDrawBits_134 _sysFn=
  $3f20 _sysArgs0=
  1 [do b= addr _sysArgs4= 1+ addr= b \sysArgs2. 134!!
        1<< \vACL, if<>0loop]
  ret]

{ Print a backward slash }
[ _print_bslash=*
  \SYS_VDrawBits_134 _sysFn=
  $3f20 _sysArgs0=
  addr 8+ addr= p=
  1 [do b= p 1- p= _sysArgs4= b \sysArgs2. 134!!
      1<< \vACL, if<>0loop]
  ret]

{ Scroll and clear last line }
[ _scroll=*
  \videoTable p= peek x= >addr. 0 <addr.
  [do
    p 16+ peek p. <p++ <p++
    $1e0 p- if<>0loop]
  \SYS_SetMemory_v2_54 _sysFn=
  [do
    x p. >_sysArgs2. 0 <_sysArgs2. $20a0 _sysArgs0= 54!!
    <x++ <p++ <p++
    $1f0 p- if<>0loop]
   ret]

[petersieg]

VERY nice looking!
Will have a closer look..

Many thx.
Best, Peter

[Phibrizzo]

Hello

This is my contribution for the contest.

175 bytes.

maze.gt1

(175 Bytes) Downloaded 453 times

Pure vCPU v5 code.

Code: Select all

_CPU    v5.vcpu

_VAR    FC_Main         #$20a0
_VAR    FC_Slash        #$21a0
_VAR    FC_BSlash       #$22a0
_VAR    FC_Scroll       #$23a0

_RUN    FC_Main

; ---------------

_VAR    adres   #129
_VAR    adresH  #130

_ORG    FC_Main

        LDWI    #$0B03  ; SetMemory
        STW     sysFn
        LDI     #60
        ST      sysArg1 ; copy value
_LAB #4
        LDWI    #$01df  ; videoTable + $df
        DEEK            ; ugly byte swap
        STW     adres
_LAB #1
        LD      #$9
        XORW    #$6
        ANDI    #1
        BNE     #2
        LDWI    FC_Slash
        BRA     #3
_LAB #2
        LDWI    FC_BSlash
_LAB #3
        CALL    vAC

        LD      adres
        XORI    #160
        BNE     #1

        LDWI    FC_Scroll
        CALL    vAC

        BRA     #4

; ---------------

_ORG    FC_Slash

        LD      adresH
        ADDI    #8
        ST      adresH
_LAB #1
        LD      adresH
        SUBI    #1
        ST      adresH

        LDI     #0
        POKE    adres
        
        INC     adres
        LD      adres
        ANDI    #7
        BNE     #1

        RET
;----------------

_ORG    FC_BSlash

_LAB #1
        LDI     #0
        POKE    adres
       
        INC     adresH

        INC     adres
        LD      adres
        ANDI    #7
        BNE     #1

        LD      adresH
        SUBI    #8
        ST      adresH

        RET
;----------------

_VAR    videoTable      #$0100
_VAR    source          #131
_VAR    destin          #133
_VAR    y               #135
_VAR    yH              #136

_ORG    FC_Scroll

        LDWI    videoTable
        ST      y          ; ugly clear y
        STW     destin
        ADDI    #16
        STW     source

        LDW     destin
        PEEK
        ST      yH

_LAB #1
        LDW     source
        PEEK
        POKE    destin

        INC     source
        INC     source
        INC     destin
        INC     destin
        
        LD      destin
        XORI    #224
        BNE     #1

_LAB #2
        LD      yH
        POKE    destin

        LDI     #160
        ST      sysArg0 ; copy count
        
        LDW     y
        STW     sysArg2 ; dest adrr
        
        SYS     #54

        INC     yH
        INC     destin
        INC     destin

        LD      destin
        XORI    #240
        BNE     #2

        RET

[petersieg]

Very nice job!

best, Peter

[lb3361]

Lots of neat tricks in Phibrizzo's code.

[lb3361]

A different effect, without scroll, 88 bytes.

maze2.gcl

(308 Bytes) Downloaded 443 times

maze2.gt1

(88 Bytes) Downloaded 453 times

Code: Select all

gcl0x

$78f8 mask=
[do
  \SYS_Random_34 _sysFn=
  [do [do 34!! mask& _sysArgs4= \sysArgs4, 160- if>=0loop] \sysArgs5, 8- if<0loop ]
  1 x= 34!! [if<0 -1 x= _sysArgs4 7+ _sysArgs4=]
  \SYS_VDrawBits_134 _sysFn= $3f00 _sysArgs0=
  1 [do \sysArgs2. 1<< b= 134!! _sysArgs4 x+ _sysArgs4= <b, if<>0loop]
loop]

[petersieg]

Very nice and SMALL too!

Thx, Peter

[Phibrizzo]

A different effect, without scroll, 88 bytes.

I tried to make an effect like yours.
It is shorter but less effective.

Maze_Phib.gt1

(79 Bytes) Downloaded 435 times

Code: Select all

_CPU    v5.vcpu

_VAR    FC_Main #$20A0

_RUN    FC_Main

; -----------------------

_VAR    line    #129
_VAR    sign    #131

_ORG    FC_Main

        LDWI    #$04E1  ; VDrawBits
        STW     sysFn
        LDWI    #$3F00  ; Colors
        STW     sysArg0

; -- Random position ---

_LAB #1
        LD      #$8
        ANDI    #%11111000
        ST      sysArg4 ; X
        SUBI    #160
        BGE     #1

_LAB #2
        LD      #$7
        ANDI    #%01111000
        BEQ     #2
        ST      sysArg5 ; Y

; -- Change direction --

        LDI     #1
        ST      line
        STW     sign

        LDW     #$6
        BLE     #3

        LDI     #-1
        ST      sign

        LD      sysArg4
        ADDI    #7
        ST      sysArg4

; ------ Draw loop ------

_LAB #3
        LD      line
        BEQ     #1

        ST      sysArg2
        SYS     #134
        
        LD      sysArg4
        ADDW    sign
        ST      sysArg4

        LD      line
        LSLW
        ST      line

        BRA     #3