Player Designed Graphics

[Mr SQL]

 

 

 

 

Checkout the artful player designed graphics!

 

Silly Venture demo Breakout 2000 Laserbeams is playing in Gameloader the Atari 2600 emulator for the Commodore 64 that adds fantastic commodore graphics to Atari games.

 

How it works:

Gameloader lets the player redesign the graphics on the fly (the tiles and background tiles are made up of 4 PETSCII characters each) after adding this code to the game: 

 

 rem --20221005 c64 2nd joystick button controls changing tile petscii
 if joy1fire=0 or f<>1 then goto skippetscii
 if joy1up=1 then BackgroundTileCharacters(0)=BackgroundTileCharacters(0)+1
 if joy1down=1 then BackgroundTileCharacters(1)=BackgroundTileCharacters(1)+1
 if joy1left=1 then BackgroundTileCharacters(2)=BackgroundTileCharacters(2)+1
 if joy1right=1 then BackgroundTileCharacters(3)=BackgroundTileCharacters(3)+1

 if joy0up=1 then TileCharacters(0)=TileCharacters(0)+1
 if joy0down=1 then TileCharacters(1)=TileCharacters(1)+1
 if joy0left=1 then TileCharacters(2)=TileCharacters(2)+1
 if joy0right=1 then TileCharacters(3)=TileCharacters(3)+1
skippetscii   

Since player2 (or the CPU) does not use the button it activates the ability to use both joysticks to change the 8 PETSCII characters comprising the foreground and background tiles. 

 

The code is in BASIC for simplicity, Assembly is also supported.

 

Load and Color

 

Here's a video of the color palette being player designed as well!

 

How it works:

I wrote a simple loader program for the Commodore to color in the screen using the top two rows of the keyboard after loading the ROM, this can also be done by hand using the color key combinations to change the screen colors with the color keys: