Collision Detection

sandruzzo · 09 June 2016, 10:42

Hi,

I'm going to implent a collision detection system with bob and background on A1200 + Fastram. My thought is to do it with cpu on fast-ram. Is That the fastest way to go, or blitter collisions if faster?

Daedalus · 09 June 2016, 15:41

If the bitmaps and bobs are already in chip RAM for display, surely the blitter would be quicker as you would have to copy them all to fast RAM to do the detection. In chip RAM there's probably no point using the CPU to do it, but I could be wrong. If you're assembling the frames in fast RAM and then copying them to chip RAM to display, then you would probably be better off using the CPU.

Retro1234 · 09 June 2016, 15:47

How you going to do collision with Bobs and the background? Maths and boxing is probably what is normaly used - using a small amount of CPU that even a ZX could probably handle - you already have your map in Ram? so you already have your collision data ready to be read.

sandruzzo · 09 June 2016, 16:25

Yes, I have my map on ram, even a copy of collision mask is on fast ram

Retro1234 · 09 June 2016, 16:34

You can just use your map if you think a map editor in reverse instead of writing to the map your reading it seeing whats walkable and whats not.

Daedalus · 10 June 2016, 12:50

Yeah, then just use the CPU if the information's already there in fast RAM to be used.

09 June 2016, 10:42	#1
sandruzzo Registered User Join Date: Feb 2011 Location: Italy/Rome Posts: 2,292	Collision Detection Hi, I'm going to implent a collision detection system with bob and background on A1200 + Fastram. My thought is to do it with cpu on fast-ram. Is That the fastest way to go, or blitter collisions if faster?

09 June 2016, 15:47	#3
Retro1234 Phone Homer Join Date: Jun 2006 Location: 5150 Posts: 5,781	How you going to do collision with Bobs and the background? Maths and boxing is probably what is normaly used - using a small amount of CPU that even a ZX could probably handle - you already have your map in Ram? so you already have your collision data ready to be read. Last edited by Retro1234; 09 June 2016 at 15:55.

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09 June 2016, 15:41	#2
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,349	If the bitmaps and bobs are already in chip RAM for display, surely the blitter would be quicker as you would have to copy them all to fast RAM to do the detection. In chip RAM there's probably no point using the CPU to do it, but I could be wrong. If you're assembling the frames in fast RAM and then copying them to chip RAM to display, then you would probably be better off using the CPU.

09 June 2016, 16:25	#4
sandruzzo Registered User Join Date: Feb 2011 Location: Italy/Rome Posts: 2,292	Yes, I have my map on ram, even a copy of collision mask is on fast ram

09 June 2016, 16:34	#5
Retro1234 Phone Homer Join Date: Jun 2006 Location: 5150 Posts: 5,781	You can just use your map if you think a map editor in reverse instead of writing to the map your reading it seeing whats walkable and whats not.

10 June 2016, 12:50	#6
Daedalus Registered User Join Date: Jun 2009 Location: Dublin, then Glasgow Posts: 6,349	Yeah, then just use the CPU if the information's already there in fast RAM to be used.

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