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Author Topic: 160x240 CSE scrolling speed test gives promising results  (Read 14334 times)

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Offline DJ Omnimaga

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160x240 CSE scrolling speed test gives promising results
« on: March 28, 2013, 10:37:17 pm »
Just now, tr1p1ea has posted the following video on Youtube and OmnomIRC:



This video shows a TI-84 Plus C Silver Edition tile-mapper, featuring scrolling, in the 160x240 resolution mode that Calc84maniac recently discovered. The speed result is very promising! The sprites used in the video are 8x8, with their height scaled up to 16 pixels, but since the calculator is set to 160x240 instead of 320x240, the sprites looks as large as their height.

Hopefully an ASM library that allows TI-BASIC programmers to change the horizontal screen resolution and the display starting position (z-adress) will also be released in the near future, so that those programmers can take advantage of that Atari/Commodore-like mode too!


This means that fast-paced side scrollers should be very easy to create on Texas Instruments' newly released color calculator.
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Offline Sorunome

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #1 on: March 28, 2013, 10:45:47 pm »
* Sorunome feels honord by being mentioned in that screenie
* Sorunome lost
* Sorunome thinks it is awesome and this little feature may get him to buy a CSE after all as it s so quick O.o
* Sorunome notices that his message only consists out of /me messagges
« Last Edit: March 28, 2013, 10:46:04 pm by Sorunome »
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Offline calc84maniac

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #2 on: March 28, 2013, 10:51:54 pm »
Note that the scrolling in that video doesn't involve drawing any pixels, by the way. It'll be a bit slower if you want to have a play area wider than two screen widths, since you'll have to actually draw in the new tiles. Should still be relatively fast, though.
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Offline tr1p1ea

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #3 on: March 28, 2013, 11:37:21 pm »
The test doesn't do any drawing but it also only processes every 16th frame so there is room to play possibly.
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Offline calc84maniac

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #4 on: March 29, 2013, 12:05:12 am »
Quote from: tr1p1ea on March 28, 2013, 11:37:21 pm
The test doesn't do any drawing but it also only processes every 16th frame so there is room to play possibly.
I keep wondering, what exactly is a "frame" here. I mean, if all you're doing is changing the scroll registers you can probably get over 9000 FPS, but that doesn't really affect the display which has its own frame rate.
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Offline tr1p1ea

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #5 on: March 29, 2013, 12:14:38 am »
Lol I was reluctant to use the word frame because it isn't really correct. Basically instead of scrolling every loop I only change x every 16 loops. The registers are still written to every iteration tho ... just wanted a quick delay *hides*
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Offline DJ Omnimaga

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #6 on: March 29, 2013, 01:33:55 am »
Do you think you could do a video showing scrolling where an entire column of tiles is updated every frame? I am curious about how fast it would be. TO make it more accurate, add a Mario sprite, along with 3 enemies and a shroom in the mix, using masking for all.
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Offline Ti-Programmer

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #7 on: March 29, 2013, 01:49:21 am »
Nice job with the tests.

So does that mean that the 84 CSE games will have levels that are just super-sized images that are zoomed in and scrolled, and the sprites are moved on them?
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Offline Streetwalrus

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #8 on: March 29, 2013, 04:21:38 am »
That's very nice !
So that's basically GBA resolution. Not bad at all ! I hope we can write fast enough tile map renderers. :)
Do we have that extra space on the vertical axis (for RPGs) ?
« Last Edit: March 29, 2013, 04:25:59 am by Streetwalker »
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Offline TIfanx1999

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #9 on: March 29, 2013, 05:14:01 am »
you should be able to make arbitrary sized buffers regardless, but the hardware doesnt support vertical scrolling the same way it does horizontal scrolling shown in the video. Vertical scrolling will be slower.
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Offline Streetwalrus

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #10 on: March 29, 2013, 08:28:29 am »
Arf that's too bad I got oversized hope. :(
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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #11 on: March 29, 2013, 11:54:24 am »
That's pretty cool. Hope lots of GBA-like games gets developed :P
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Offline Keoni29

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #12 on: March 29, 2013, 12:16:56 pm »
Can it also repeat the image and stitch the ends together?
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Offline calc84maniac

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #13 on: March 29, 2013, 12:24:58 pm »
Quote from: Keoni29 on March 29, 2013, 12:16:56 pm
Can it also repeat the image and stitch the ends together?
Yep, that's exactly what happens. If you draw tiles offscreen before you reach them, you can pretty much scroll infinitely in the horizontal direction.
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Offline Keoni29

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Re: 160x240 CSE scrolling speed test gives promising results
« Reply #14 on: March 29, 2013, 12:26:48 pm »
It doesnt look like it though. You see that it's just one image, but it's stretched out to fill multiple screens. You can only scroll within the boundaries of the image in this demo.
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