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Author Topic: Floorcaster  (Read 19056 times)

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Offline Galandros

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Re: Floorcaster
« Reply #15 on: July 24, 2010, 05:33:56 am »
bwang continues to bring 3D to Nspire. We could make a racing game with the engine.

What are the differences between mode7 and floorcaster (raytracer)?
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Offline Hot_Dog

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Re: Floorcaster
« Reply #16 on: July 24, 2010, 11:34:33 am »
Quote from: Galandros on July 24, 2010, 05:33:56 am
What are the differences between mode7 and floorcaster (raytracer)?

I was wondering about that myself.

Bwang, that sounds exciting!  Thanks for all the engines you're making!
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Offline fb39ca4

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Re: Floorcaster
« Reply #17 on: July 24, 2010, 02:08:20 pm »
Nice work!

Also, to make this more efficient, I would recommend drawing to a half-size screenbuffer (19200 bytes) and copying that to the bottom half of the screen. Then, you could have a parallax background in the top section.
« Last Edit: July 24, 2010, 03:12:33 pm by fb39ca4 »
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Offline bwang

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Re: Floorcaster
« Reply #18 on: July 24, 2010, 04:04:15 pm »
I only draw half the screen right now.
Quote from: Galandros on July 24, 2010, 05:33:56 am
What are the differences between mode7 and floorcaster (raytracer)?
Mode 7 takes a sprite, translates and rotates it, and then scales each horizontal line appropriately to give an illusion of perspective.
Floorcasting does a calculation for each pixel that determines the intersection between a ray and a plane.
They are completely different algorithms which give the same results.
« Last Edit: July 24, 2010, 04:19:10 pm by bwang »
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Offline bwang

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Re: Floorcaster
« Reply #19 on: July 24, 2010, 06:40:08 pm »
I converted everything to fixed point, and now I can draw twice the number of pixels and still get a 25% speed gain :)
Fixed point is amazing; I think my next project will be converting Ncaster to fixed point.
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Offline Galandros

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Re: Floorcaster
« Reply #20 on: July 24, 2010, 06:56:12 pm »
Thanks for the answer. ^^

That is a really cool speed up. The ARM cpu doesn't offer better support for floats than z80 for instance? Seems a dramatic speed up, never knew the difference on speed but I have read that is used for games for "desktop computer" games (x86).
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Offline bwang

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Re: Floorcaster
« Reply #21 on: July 24, 2010, 07:02:04 pm »
I'm not an ASM programmer, so I'm not sure whether the Nspire has an FPU.
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Offline TIfanx1999

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Re: Floorcaster
« Reply #22 on: July 25, 2010, 07:00:26 am »
Quote from: bwang on July 24, 2010, 06:40:08 pm
I converted everything to fixed point, and now I can draw twice the number of pixels and still get a 25% speed gain :)
Fixed point is amazing; I think my next project will be converting Ncaster to fixed point.
Very nice! I wonder how much of a speed gain Ncaster will get from this?
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Offline fb39ca4

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Re: Floorcaster
« Reply #23 on: July 25, 2010, 01:58:58 pm »
Quote from: bwang on July 24, 2010, 04:04:15 pm
I only draw half the screen right now.

What I mean is, since you only draw to the bottom half of the screen, you should only copy the bottom half of the screenbuffer.

Nice work with the fixed-point version. Could you have an option to change the quality in the next version? (2x2, 2x1, and single pixels.)
« Last Edit: July 25, 2010, 03:57:16 pm by fb39ca4 »
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Offline bwang

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Re: Floorcaster
« Reply #24 on: July 25, 2010, 04:17:08 pm »
Quote from: Art_of_camelot on July 25, 2010, 07:00:26 am
Quote from: bwang on July 24, 2010, 06:40:08 pm
I converted everything to fixed point, and now I can draw twice the number of pixels and still get a 25% speed gain :)
Fixed point is amazing; I think my next project will be converting Ncaster to fixed point.
Very nice! I wonder how much of a speed gain Ncaster will get from this?
Probably ~2x.
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Offline bwang

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Re: Floorcaster
« Reply #25 on: July 25, 2010, 11:03:31 pm »
Here's a small video of it in action on hardware, since I've given up trying to get screenshots to work.
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Offline calcdude84se

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Re: Floorcaster
« Reply #26 on: July 25, 2010, 11:29:23 pm »
Cool! Now for other textures besides a checkerboard ;D
Keep up the good work! :)
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Offline TIfanx1999

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Re: Floorcaster
« Reply #27 on: July 25, 2010, 11:49:04 pm »
Excellent! You should be very pleased with the results! If only wish TI had put in a better LCD.
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Offline bwang

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Re: Floorcaster
« Reply #28 on: July 26, 2010, 12:19:44 am »
Yeah, this turned out to be a lot more usable than I thought it would be.
I should add tile mapping, so then I can write F-Zero Nspire Edition :D
Blarg, except I have several other projects I'm thinking about, and I'm busy with real life :(
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Offline Builderboy

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Re: Floorcaster
« Reply #29 on: July 26, 2010, 01:32:26 am »
Wow that looks excellent!  I cant wait to see what it will look like with a tilemapper working :D Especially greyscale ^^ Although the LCD kinda is no good :/
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