798 replies to this topic

[Cranium]

Well there's a nice explanation of how old games did their wizardry with their memory limits. Series starts here.

[Bomb Bloke]

Heh. I used to number my sprite columns using powers of two (as opposed to the exponents), made 'em easier to tally up.

He was a bit off in that he was talking in terms of Manufacturer's Megabytes; though I've no doubt he understood the error and just didn't want to complicate his explanation by elaborating on it. Long story short the C64's RAM (like every other device I've ever been aware of) isn't measured that way, and a full screen 4bit image doesn't quite add up to 32KB.

Even colour depth within palettes (which also consume RAM, by the way) was packed down in those days; you might assume each index would consume 24bits, but it was often less. The same technique still sees use today in some image file formats.

Hardware-controlled sprites were fun; they made it very very simple to move multiple images around a screen without worrying about how they might interfere with each other. I've got a hunch Dan may've built something along their lines into COS2.

[COOLGAMETUBE]

I want Bling Bling Lamps on the front (I opened a post)

[CaosTECH]

Dan, I played Redirection (The Real Version Not Computercraft Version) And It Was Awesome, But I have a question, why did it raise from 2 - 5 dollars?

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[oeed]

ArchTyler, on 13 November 2015 - 12:44 AM, said:

Why did it raise from 2 - 5 dollars?

Because it's his main (I think?) source of income... If anything $5 is waaaay too low.

[dan200]

ArchTyler, on 13 November 2015 - 12:44 AM, said:

Dan, I played Redirection (The Real Version Not Computercraft Version) And It Was Awesome, But I have a question, why did it raise from 2 - 5 dollars?

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This is a weird way to contact me... but Redirection was never $2. The lowest it has been is $4 on sale.

[CaosTECH]

ArchTyler, on 14 October 2015 - 08:49 PM, said:

Whats that supposed to be? From the code it looked like a spaceship, but now it just looks plain creepy

oeed, on 14 October 2015 - 08:42 PM, said:

Not as good, although very understandable news:

"Ok, focus for the time being is back to @redirectiongame. Finances are such that I can't have two projects in development limbo at a time!"

I have been waiting to ask this question... why does redirection cost money? If we can play it for free on CC?

Before I asked this I looked at the website and it said 2$

[SquidDev]

I had a go at writing a 3D engine using the Silica emulator, though it is far from perfect:



As you can see there are several glitches with rendering. It does however implement depth testing, so you don't need to sort triangles before drawing. The weird colours are due to the fact that I tried to implement colour blending, which looks much better in Love:



I've also tried to massively optimise it, but it still runs like a snail in CC (but is fine in Love which is even odder). If you want to have a look through the source, it lives on GitHub but is kinda ugly in places. It uses quite a lot of code generation - the matrix, buffer and graphics library are generated by the build file. This should mean the matrix library is slightly quicker, and also means I can generate triangle rendering code that blends z values, colours or whatever you specify - it would be easy to generate a triangle drawer using texture coordinates instead. This also means I can provide triangles with and without colour blending to speed up triangle rasterisation a bit more. This isn't really a "serious" project though, more of a way for me to learn the basics about 3D graphics.

That being said, I'm happy for people to take this and improve it - it is still pretty buggy. Also alpha blending is a thing, though I see no point of it in CC (also it is very buggy due to overlapping triangles - though I'm not sure where all of those lines have come from).



Update:
A couple of minor optimisations later and this can render a spinning cube at about 30fps - though this isn't really practical for anything advanced. Blitting to the screen is still the slowest part of this: drawing to the buffer (and calculating matricies, etc... ) takes 0.00065 seconds, compared with 0.02793 to draw to the screen.

For those interested, you can see a video here. I don't know why it looks so jumpy - my calculations show it is running at 30fps, but it doesn't look like it is. There is also a pastebin here if people fancy a play (the code is really ugly - see above). I guess my next goal will be to get some sort of maze game working.

Another update:
I messed up some stuff and so started the next-frame timer after rendering not before hand, and so ended up running at 15fps instead (though seeing as CC's refresh rate is 20fps it doesn't really matter).

Edited by SquidDev, 14 November 2015 - 04:34 PM.

[CraftedCart]

Oooh... Pretty startup screen
https://vine.co/v/iB1EiEBpFOw
https://twitter.com/...552046213505025

Good job on the 3D engine SquidDev - I wouldn't even know where to start coding that.

Edited by CraftedCart, 14 November 2015 - 03:43 PM.

[SquidDev]

CraftedCart, on 14 November 2015 - 03:38 PM, said:

Oooh... Pretty startup screen
https://vine.co/v/iB1EiEBpFOw
https://twitter.com/...552046213505025

Ohhh, that looks nice. Wonder if it just an animation or if that is being calculated (so static frames or if the text position, pixels, etc... are being set through code).

CraftedCart, on 14 November 2015 - 03:38 PM, said:

Good job on the 3D engine SquidDev - I wouldn't even know where to start coding that.

Thanks! It is just matrices, lots and lots of them (well like 5).

[LeDark Lua]

aren't there are like 3 matrices? Or I'm wrong....

[Lignum]

LeDark Lua, on 14 November 2015 - 03:54 PM, said:

aren't there are like 3 matrices? Or I'm wrong....

Yes, usually it's the model, view and projection matrix. I'm not sure about how his 3D engine works, so I guess the other two are implementation details or something?

[SquidDev]

Lignum, on 14 November 2015 - 04:03 PM, said:

LeDark Lua, on 14 November 2015 - 03:54 PM, said:

aren't there are like 3 matrices? Or I'm wrong....

Yes, usually it's the model, view and projection matrix. I'm not sure about how his 3D engine works, so I guess the other two are implementation details or something?

Normally this is the case, but there is only one important matrix - which is the one every vertex is multiplied by. This example is so simple it doesn't need both a view and model matrix, instead the final matrix is made up of 4 view matrices (translate , rotate in x and y and scale) and one projection. However there is nothing stopping you changing the order: projecting the vertices into 3D space and then scaling them: such as rendering a scene upside down.

[oeed]

SquidDev, on 14 November 2015 - 12:04 PM, said:

I had a go at writing a 3D engine using the Silica emulator, though it is far from perfect:
--snip--

Wow. That's really impressive! I'm really looking forward to all the things people are going to make.

[Waitdev_]

thinking about it, its kind of obvious when you realise it. this is most likely going to be in minecraft, because why call it "CraftOS 2.0" if it wouldn't be in minecraft?
and for that startup video, why is that fullscreen? maybe it is gonna be a real OS.

[oeed]

Wait_, on 15 November 2015 - 01:12 AM, said:

thinking about it, its kind of obvious when you realise it. this is most likely going to be in minecraft, because why call it "CraftOS 2.0" if it wouldn't be in minecraft?
and for that startup video, why is that fullscreen? maybe it is gonna be a real OS.

We've covered this numerous times, we're about 90% certain that it's not in Minecraft. Now, it could be, but there's been a ton of evidence suggesting it isn't, including a screenshot of it as a standalone program with the Mac desktop in the background.

[Creeper9207]

#StarFoxCC
Is that engine actually running at like 15-30fps? if so how many polygons can it handle at that rate

Edited by Creeper9207, 15 November 2015 - 02:20 AM.

[Creator]

The question is, is it faster than Love2d?

[クデル]

Creator, on 15 November 2015 - 06:10 AM, said:

The question is, is it faster than Love2d?

Dan could be using the Love2d framework for all we know, unless something was previously mentioned that I can't be bothered checking for

[SquidDev]

I was bored:


For reference, this is an 8x8x8 chunk of blocks being rendered - there are about 2600 polygons here which are being drawn in 0.025 seconds, and blitted in 0.038. There are some pretty serious bugs with this: as you can see random lines are being drawn off the edge of triangles: I have no idea why Fixed! Also, when the z coordinate is close to 0, all sorts of things go wrong due to x and y technically being infinite. I'm going to try to fix these, but don't know how it will go.

On a positive note, these textures were rendered with about 20 lines of code which I think is pretty cool, and shows how powerful code generation can be.

Lets be honest though, this isn't ever going to be playable (though it is not too bad running in Love).

Update:
Fixing the additional line bug makes the alpha-blending look much better (though it easy too see that I'm not sorting faces correctly (green is opaque).

Edited by SquidDev, 16 November 2015 - 04:37 PM.