Atari ST - 1992
Pixelize
- Genre
- Programming - Aids / Routines / Tools
- Year
- 1992
- Language
- Compiled C
- Publisher
- [no publisher]
- Controls
- Keyboard
- Distributor
- -
- Players
- —
- Developer
- Atari Corporation
- Resolution
- Low / Medium / High
- Licensed from
- -
- Programmer(s)
- Stedman, Roy
- Country
- Graphic Artist(s)
- —
- Software
- English
- Game design
- —
- Box/Instructions
- English
- Musician(s)
- —
- License
- PD / Freeware / Shareware
- Sound FX
- —
- Serial
- —
- Cover Artist(s)
- —
- ST Type
- ST, STe, TT, Falcon030 / 0.5MB
- MIDI
- —
- Version
- 0.6
- Dump
- Download
- Number of Disks
- 1 / Double Sided / HD Installable
- Dump format
- MSA
- Protection
- —
ADDITIONAL COMMENTS
Found from ex-Atari employee's hard disk. C sources included.
INSTRUCTIONS
Pixel Stuff - convert ST style bitplanes to packed pixel format for the Falcon Algorithm used is to shift bits out of planes and into packed pix register one at a time, high bit first. Note: Don't do this with 1 bpp data, it wastes time & confuses things. Pseudo-Code to convert 16 pixels (2 4 or 8 bpp) to packed pixels -------------------------------------------------------------------------------- LOAD PLANES[1..NUMBITPLANES] WITH one bitplane word (16 bits) each ; (sequential out of memory) FOR k = 1 to (NUMBITPLANES/2) ; save every 32 bits of ppix FOR i = 1 to (32/NUMBITPLANES) ; create 32 bits of packedpixels FOR j = NUMBITPLANES downto 1 ; Get MSB of the pixel first LSL.L PLANE[j] ; shift bit left into X bit ROXL.L PACKEDPIX ; Rotate X bit left into dest. ENDFOR j ENDFOR i SAVE PACKEDPIX ; save 32 bits of ppix ENDFOR k --------------------------------------------------------------------------------