Sprite issues

attle · 21 February 2016, 22:00

Trying to learn Amiga C programming and I've run into an issue when displaying my hardware sprite. I am using this as a basis:

http://wiki.amigaos.net/wiki/Hardwar...Sprite_Example

Trying to adapt this example to a 32-color palette, and use a sprite drawn with that palette. I used sprite 2, so colors 20-23. The palette was exported to C source with PPaint, the sprite too, and this is the result when it is displayed (see attached image)

Sprite on the left, the correct brush I exported from is on the right.

Full source here: http://pastebin.com/P2JaN0MW

It does get the proper palette index, but the data is all jumbled around.

Why is that? Should some special tool be used? I've tried exporting in PPaint, PicConv, ArtPro etc, sprite data is of course the same.

Edit: I realised after posting, that the brush probably must be two bitplanes in depth. I re-saved it and the data was different, but the sprite still looks messed up.

losso · 22 February 2016, 09:45

Your data:

Code:

 | ..############.. | 
 | .##############. | 
 | ################ | 
 | ################ | 
 | ################ | 
 | ################ | 
 | ################ | 
 | .##############. | 
 | .##############. | 
 | ..############.. | 
 | ...#........#... | 
 | ..###......###.. | 
 | ..####....####.. | 
 | ..#..........#.. | 
 | ...#..#..#..#... | 
 | ....#.#..#.#.... | 
 | ..############.. | 
 | .#............#. | 
 | #..###....###..# | 
 | #..............# | 
 | #.####....####.# | 
 | ###..######..### | 
 | #.####....####.# | 
 | .#............#. | 
 | .##...####...##. | 
 | ..##........##.. | 
 | ...##########... | 
 | ..#..######..#.. | 
 | ..#...####...#.. | 
 | ..############.. | 
 | ...##########... | 
 | ....###..###.... |

…needs to be interleaved (currently, it’s one plane after the other). Does PPaint have a switch for that?

attle · 22 February 2016, 12:53

Yes, that's it.

If the image is reduced to one bitplane in PPaint instead, with the two sprite bitplanes laid out beside each other, and THEN exported as a brush to source, it works (thanks Menthos!)

Kind of a hassle to draw sprites that way though! Is there really no tool for this?

Leffmann · 22 February 2016, 16:57

PicCon can save brushes as raw sprite data, you can find it on Aminet.

attle · 23 February 2016, 09:28

PicCon almost does what I want, but it saves the data in a ULONG array instead of UWORD. Not a big deal to fix in a text editor, but I may end up writing my own converter.

hooverphonique · 23 February 2016, 13:23

Quote:

Originally Posted by velourfog

PicCon almost does what I want, but it saves the data in a ULONG array instead of UWORD. Not a big deal to fix in a text editor, but I may end up writing my own converter.

isn't that just because it includes both bitplanes in the same longword?

attle · 23 February 2016, 13:46

Maybe, I didn't try just casting to UWORD so I don't know if it will work.

http://amigadev.elowar.com/read/ADCD.../node00C5.html

Leffmann · 23 February 2016, 14:26

It doesn't matter what type it's declared as or casted from, as long as the data is in the right place and has the right format it will work. If you open the image settings panel then you can select sprite format and check the CTRLwords setting, and it will export as UWORD.

A better way is to export to object format and just pass it to the linker instead, that way you don't have to include your graphics as large arrays into your source code.

21 February 2016, 22:00	#1
attle Registered User Join Date: Aug 2012 Location: RAM: Posts: 83	Sprite issues Trying to learn Amiga C programming and I've run into an issue when displaying my hardware sprite. I am using this as a basis: http://wiki.amigaos.net/wiki/Hardwar...Sprite_Example Trying to adapt this example to a 32-color palette, and use a sprite drawn with that palette. I used sprite 2, so colors 20-23. The palette was exported to C source with PPaint, the sprite too, and this is the result when it is displayed (see attached image) Sprite on the left, the correct brush I exported from is on the right. Full source here: http://pastebin.com/P2JaN0MW It does get the proper palette index, but the data is all jumbled around. Why is that? Should some special tool be used? I've tried exporting in PPaint, PicConv, ArtPro etc, sprite data is of course the same. Edit: I realised after posting, that the brush probably must be two bitplanes in depth. I re-saved it and the data was different, but the sprite still looks messed up. Attached Images Last edited by attle; 22 February 2016 at 06:18. Reason: fixed image

22 February 2016, 12:53	#3
attle Registered User Join Date: Aug 2012 Location: RAM: Posts: 83	Yes, that's it. If the image is reduced to one bitplane in PPaint instead, with the two sprite bitplanes laid out beside each other, and THEN exported as a brush to source, it works (thanks Menthos!) Kind of a hassle to draw sprites that way though! Is there really no tool for this? Attached Images

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22 February 2016, 16:57	#4
Leffmann Join Date: Jul 2008 Location: Sweden Posts: 2,269	PicCon can save brushes as raw sprite data, you can find it on Aminet.

23 February 2016, 09:28	#5
attle Registered User Join Date: Aug 2012 Location: RAM: Posts: 83	PicCon almost does what I want, but it saves the data in a ULONG array instead of UWORD. Not a big deal to fix in a text editor, but I may end up writing my own converter.

23 February 2016, 13:46	#7
attle Registered User Join Date: Aug 2012 Location: RAM: Posts: 83	Maybe, I didn't try just casting to UWORD so I don't know if it will work. http://amigadev.elowar.com/read/ADCD.../node00C5.html

23 February 2016, 14:26	#8
Leffmann Join Date: Jul 2008 Location: Sweden Posts: 2,269	It doesn't matter what type it's declared as or casted from, as long as the data is in the right place and has the right format it will work. If you open the image settings panel then you can select sprite format and check the CTRLwords setting, and it will export as UWORD. A better way is to export to object format and just pass it to the linker instead, that way you don't have to include your graphics as large arrays into your source code.

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