This will be a short one.
Start Turbo Rascal SE and click the “images” tab. Select a new image of type “multicolor”, and press “import”.
In the import section, open an image of your own choosing. For that special effect, I decided on a nice image of a moose during sunset. Probably because I live in Norway. Play around with parameters in order to create a perfect atmospheric image of a moose.
Here’s a screenshot of the editor
When you are done with the image, export as binary to your .RAS project folder.
Now here’s the nice part: the code is absolutely short.
program Tutorial6; var image_color: IncBin("images/moose_color.bin", "$5000"); image_data: IncBin("images/moose_data.bin", "$6000"); begin setmulticolormode(); setbitmapmode(); poke(VIC_DATA_LOC, 0,$18); setbank(VIC_BANK1); copyimagecolordata(image_color,1); // bank 1 Loop(); end.
Some handy explanations:
- The binary part of the image is split into two parts: _data and _color. The _data file contains the 8×8 character information for this bitmap, while the color binary contains the color information.
- Notice that the color and data are stored in the VIC bank #1, with memory addresses between $4000-$8000. This is done because we’ll have tons of space for code on lower memory addresses
- The function “setmulticolormode” sets the VIC multi color mode, while the setbitmapmode enables bitmap displaying (and disables character text etc)
- The technical part: We need to poke the VIC_DATA_LOC in order to tell the VIC that
- The screen memory will be placed at $400, which is specified by the high bit of $18: $1 * $400 = 400
- The bitmap data is stored at $400*8 = $2000, but locally on bank #1 at $4000 means that the actual position is $2000 +$4000 = $6000
- We then set BANK 1 to be enabled, using memory addresses $4000-$8000 for the current display
- Finally, we copy the color information from the variable image_color to the actual screen memory, using bank 1 (specified by the final parameter)
- In the end, loop and enjoy!
Here’s the code running on VICE.<