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Old 24 October 2019, 04:57   #1
turrican3
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kind of way to display gfx on amiga ?

hello guys,
i know that there is bobs and sprites,
is there others ways to display characters, backgrounds on amiga ??
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Old 24 October 2019, 06:23   #2
Samurai_Crow
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Tiles are quicker than Bobs.
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Old 24 October 2019, 10:18   #3
meynaf
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Quote:
Originally Posted by turrican3 View Post
hello guys,
i know that there is bobs and sprites,
is there others ways to display characters, backgrounds on amiga ??
Aside of bobs (Blitter OBjectS) and sprites (hardware incrusted objects), you can always do things with the cpu.


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Tiles are quicker than Bobs.
But Amiga has no tiled mode.
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Old 24 October 2019, 10:20   #4
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By "tiles" I mean a regular opaque blit.
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Old 24 October 2019, 10:26   #5
meynaf
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Quote:
Originally Posted by Samurai_Crow View Post
By "tiles" I mean a regular opaque blit.
This appears to be very similar to a blitter object...
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Old 24 October 2019, 10:35   #6
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Transparency masked blits take twice as long as a straight copy because the blitter needs to read the mask for each bitplane separately.
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Old 24 October 2019, 10:45   #7
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Originally Posted by Samurai_Crow View Post
Transparency masked blits take twice as long as a straight copy because the blitter needs to read the mask for each bitplane separately.
Right, but both are nevertheless blitter objects. Else we would go into more details such as line drawing, blitter filling, etc. Probably not the kind of answer the OP wanted.
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Old 24 October 2019, 11:15   #8
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Quote:
Originally Posted by meynaf View Post
Right, but both are nevertheless blitter objects. Else we would go into more details such as line drawing, blitter filling, etc. Probably not the kind of answer the OP wanted.
Agreed.
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Old 24 October 2019, 11:50   #9
dodke
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Maybe 'copper chunky' would count as displaying graphics that's not either.

Basically using multiple colours that you update in the copperlist on each line to show an image. Or for much lower resolution you could just update the same colour.

For scrolling or animation you can use blitter to set the colours in the copperlist.
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Old 24 October 2019, 11:53   #10
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Originally Posted by turrican3 View Post
hello guys,
i know that there is bobs and sprites,
is there others ways to display characters, backgrounds on amiga ??
You can also generate background images with the copper, with very low horizontal resolution (8 lowres pixels), but all 4096 colors. Some demos used it, mainly for plasma effects.
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Old 24 October 2019, 13:06   #11
ross
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Copper Chunky example.

Pixels are.. hmm.. big





EDIT:
Download .gif version to see it 'in action'.
Actually much better given that on Amiga it is 50fps and 12 bit RGB.
This is not pure Copper COLOR00 effect (as said by chb) because use AGA colors bank switching and BPLs as CLUT indexer (as dodke pointed out),
but the concept is that and is used with different variations in many demos.
[just to clarify, this mode does not a software (CPU and/or Blitter) chunky2planar conversion, but use directly the Amiga hardware properties]
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Old 24 October 2019, 13:17   #12
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Chunky example.

Pixels are.. hmm.. big
I wonder what that would look like in more subtle colours. Whether I could use it to give a gradient to the sky and ground in a flight sim game...
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Old 24 October 2019, 13:35   #13
ross
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I wonder what that would look like in more subtle colours. Whether I could use it to give a gradient to the sky and ground in a flight sim game...
Nah.. too much DMA intensive.
Blitter is practically unusable during "pixels" display.
You need to restrict display window or use CPU and fastmem to do something decent.
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