Re: A86: Question on tile maps
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Re: A86: Question on tile maps
Not only is this easier programming, but it makes the game go at a constant
rate. Remember how in penguins if you didn't move to the left or right the
game was extremely fast? but when you started moving, the game slowed down?
If you redraw the background independently of whether or not the player
moved, it will keep the game going at the same speed no matter what (as
opposed to using a timer routine). This is a *good* thing. Heed David's
advice.
-Justin Karneges [Infiniti]
>I've found that instead of using a SLOW sprite routine that saves the
>background, it's almost always much faster and easier to just save the
>background each frame into a secondary buffer. I call it "tripple
>buffering". You have your Video Ram or Video Buffer, Virtual Screen or
>Double Buffer, and you have the Map Screen or Map Buffer.
>
>You draw the map to the Map Buffer. At the beginning of each frame (top of
>the main loop), copy the Map Buffer to the Virtual Screen. This will
>effectively erase any sprites that were drawn the previous frame. During
>the frame, use whatever putsprite routine that you want and draw your
>sprites to the Virtual Screen. Don't worry about where they were or what
>was behind, them, just draw them as fast as possible. At the end of the
>frame, copy the Virtual Screen to Video Ram. This will save you alot of
>effort when programming, and it will be much faster if you have more than
>two or three on screen sprites. An extra 21000 t's for a buffer copy isn't
>much at all.
>
>Some example equates for this would be...
>
>VideoRam = $fc00
>VirtScr = $f600
>MapScr = $8100
>
>Example main loop... (a little easier to understand than asm, maybe)
>
>main_loop:
> copy MapScr to VirtScr
>
> ...
> draw sprites and do other stuff
> ...
>
> copy VirtScr to VideoRam
>goto main_loop
>
>--
>David Phillips <david@acz.org>
>http://www.acz.org/
>
>----- Original Message -----
>From: Andreas Finne <a_finne@hotmail.com>
>To: <assembly-86@lists.ticalc.org>
>Sent: Wednesday, January 27, 1999 7:18 AM
>Subject: Re: A86: Question on tile maps
>
>
>>
>>>From: BlAsTo1414@aol.com
>>>Date: Tue, 26 Jan 1999 22:28:35 EST
>>>To: assembly-86@lists.ticalc.org
>>>Subject: Re: A86: Question on tile maps
>>>Reply-To: assembly-86@lists.ticalc.org
>>
>>>How would I make a map(for a game like Chips Challenge{tiles also})
>>>print it to the screen and move a sprite over top of it?
>>>I also need to know how to check for collisions with other spites.
>>>ANY help on ANY of these
>>>questions would be appreciated SO much. :-)
>>>
>>>Thank you,
>>>BlAsTo1414
>>>
>>
>>To put a moveable sprite on top of other sprites without destroying the
>>background i suggest Jimmy Mardell's ASCR (ascr.h came with SQRXZ). It
>>saves the background so it doesn't get destroyed.
>>
>>Andreas Finne
>>
>>a_finne@hotmail.com
>>
>>______________________________________________________
>>Get Your Private, Free Email at http://www.hotmail.com
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>>
>
>
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