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DKT
Registered: Aug 2004
Posts: 96 |
AGSP stop
Howdy!
How to "stop" AGSP and show another static gfx starting at some position of the screen? AGSP starts from the top of the screen and I would like to show static logo at the bottom of the screen.
VSP is possible to stop with "anti" VSP, but what to do with Linecrunch? Is it possible with some trickery or do I have to move regions of mem to show gfx in a right place?
DKT |
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ChristopherJam
Registered: Aug 2004
Posts: 1370 |
Well, you know, each sprite is 3 chars wide, so 14*3=42, enough to cover the width of the screen.
Just write $3fff to register $d015 to enable them.
(No time to open borders though, with all that DMA going on.) |
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Peacemaker
Registered: Sep 2004
Posts: 243 |
14 sprites at same rasterline(s)?
did i miss something? :D |
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Spinball
Registered: Sep 2002
Posts: 87 |
Just make shure the sinus of the DYCP never gives you more then 8 sprites per line? |
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Oswald
Registered: Apr 2002
Posts: 5017 |
Quote: Well, you know, each sprite is 3 chars wide, so 14*3=42, enough to cover the width of the screen.
Just write $3fff to register $d015 to enable them.
(No time to open borders though, with all that DMA going on.)
ok you need 14 physical multiplexed sprites. thats cool :) $3fff = typo ? |
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ChristopherJam
Registered: Aug 2004
Posts: 1370 |
Nah, I was just being silly because I didn't follow what compyx was getting at :)
Kind of skimmed over the dycp bit because DKT had been talking about displaying a logo rather than a scroller (besides, would that not be a dysp??) |
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Golara
Account closed
Registered: Jan 2018
Posts: 212 |
Quote: Nah, I was just being silly because I didn't follow what compyx was getting at :)
Kind of skimmed over the dycp bit because DKT had been talking about displaying a logo rather than a scroller (besides, would that not be a dysp??)
I guess one can draw a logo with each letter being the size of a sprite so they can move up and down. |
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Compyx
Registered: Jan 2005
Posts: 631 |
I see I caused some confusion here :)
But yes, using a 14-sprite multiplexer with fixed Y-values will allow you to create the illusion of a DYCP when moving the sprites in the X-direction really fast. This will make rendering chars in the sprites really simple, the Y-offsets are fixed and there's no need to clear the chars. (Somewhat similar to plotters cheating with fixed X-positions)
An example is in the final part of Untouchable II where I use this trick to have DYCP over a bitmap logo, another example is the 'DYCP' over a FLI logo in Not Worthy . |
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Perplex
Registered: Feb 2009
Posts: 254 |
First time I can remember seeing that particular trick was in the final part of Digital Delight by Panoramic Designs. |
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Digger
Registered: Mar 2005
Posts: 421 |
Ah these logos Compyx, such mastery. |
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DKT
Registered: Aug 2004
Posts: 96 |
Doing second line-crunch and VSP with opposite values was the best solution to achieve it, to stabilize bottom gfx.
I used the method in Ukiyo
So, the first Oswald's suggestion with "anti line-crunch" was what should be done, thx :)
Topic closed ;) |
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