Author Topic: nGL - a fast (enough) 3D engine for the nspire (Read 266038 times)

Matrefeytontias · « **Reply #15 on:** November 28, 2013, 04:35:32 pm »

Simple but awesome proof-of-concept

I feel like I'll be doing something to see how powerful it is ...

* Matrefeytontias is planning things, be ready people

Vogtinator · « **Reply #16 on:** November 28, 2013, 04:36:29 pm »

Not really, it needs three division per horizontal line (z, u and v) and the pixel() function checks whether the pixel is visible (clipping and z-buffer). It basically scales linear to height, but I'll improve that once I implement triangle clipping.

Edit: If you're reading this and getting confused, this is a reply to the second last post

Matrefeytontias · « **Reply #17 on:** November 28, 2013, 04:37:29 pm »

By the way, what attachment should I download to have the latest version of the nGL lib ?

Vogtinator · « **Reply #18 on:** November 28, 2013, 04:39:56 pm »

Just the snake3d_something.tar.gz. the only snake specific parts are the textures and main.cpp.
If you want to I can give you a tool to convert images (png, gif, jpeg, tiff...) to header files with filled TEXTURE structs.

Matrefeytontias · « **Reply #19 on:** November 28, 2013, 04:40:24 pm »

Yeah I might want to use that

Vogtinator · « **Reply #20 on:** November 28, 2013, 04:44:38 pm »

Beware: It's written in C++ (with Qt), source code and binary for x86_64 linux attached. It's sort of hacked together (doesn't even show whether the file exists), but it should work.
./ConvertImg test.png >> textures.h and then #include "textures.h" and use the texture with glBindTexture(&test);

Matrefeytontias · « **Reply #21 on:** November 28, 2013, 04:50:25 pm »

And if I use Windows ?

Levak · « **Reply #22 on:** November 28, 2013, 05:13:28 pm »

Quote from: Matrefeytontias on November 28, 2013, 04:50:25 pm

And if I use Windows ?

Then use drapes.

edit : More seriously, Qt development tools exist for Windows, just google it and compile it yourself.

DJ Omnimaga · « **Reply #23 on:** December 19, 2013, 03:02:03 am »

Quote from: Vogtinator on November 28, 2013, 03:47:51 pm

So, I fixed a few bugs in nGL (fewer crashes) and converted my snake game (I made exactly one year ago) to 3D.
No special features, just plain snake.
You can still move around and look.
The apple is just a cube with apple texture (I found on the internet), I couldn't find a suitable 3D model of an apple and I can't use blender.
Every block on the screen is drawn and textured completely, the game isn't optimized at all (walls between two wall blocks) but still runs smooth.
Sorry, but I'm more programmer than game designer and I just couldn't do it any better...

Controls: 8-6-4-2: Move snake
WASD: Move around (for testing with nspire_emu)
touchpad: Look around

Nice HP Prime game! Oh wait nvm it's Nspire

(it just reminded me a bit of the 3D thing I made, except it was actually pseudo 3D in my case)

I like how this library is turning out so far.

Vogtinator · « **Reply #24 on:** December 24, 2013, 08:30:17 pm »

UPDATE!

I made some progress on nGL and made another demo (which is again, not intended to be "played"): crafti!

Changes:

Faster! A lot faster, actually. I can't tell any numbers, but with large triangles it went from slow to smooth
Interpolating colors between vertices, which is actually slower than textured rendering
Prefixed functions with ngl (for example nglInit)
Something like vertex arrays (nglAddVertices)
Wireframed rendering
Doesn't crash anymore
Some documentation
Clipping! (X: Per pixel Y: Per line Z: Per triangle)

Todo:

Colored textures (non-interpolated)
Compressed textures (zlib). nGL doesn't lose performance with higher-resolution images, they just get too big in raw format
Make a real, playable, good looking game which uses nGL
FPS counter

It looks a lot better on the emulator and on calc than these gifs (byzanz-record is crap):

(The emulator runs at 90% speed here, I accidentially hit F9)

The textures used aren't mine this time, terrain.png came from http://www.planetminecraft.com/texture_pack/fancycraft-by-jjjas0n-64x64-version-100.
Also, the controls (same as nGL in the first post) are a bit weird to use on a PC so the twitches you see are just my fingers finding the keys.

It's a bit slower on calc than on the emulator, I suspect it's the touchpad polling every frame, but if that get's a real issue, I'll take care of that.
If you want to use nGL, grab gl.cpp, gl.h, fastmath.h, fastmath.cpp, fix.h and don't forget to read gl.h and #define SAFE_MODE in gl.h!

Levak · « **Reply #25 on:** December 24, 2013, 08:37:08 pm »

Quote from: Vogtinator on December 24, 2013, 08:30:17 pm

It's a bit slower on calc than on the emulator, I suspect it's the touchpad polling every frame, but if that get's a real issue, I'll take care of that.
If you want to use nGL, grab gl.cpp, gl.h, fastmath.h, fastmath.cpp, fix.h and don't forget to read gl.h and #define SAFE_MODE in gl.h!

I notived that on my nAk3d project (dropped down due to your way better GL implementation

).
This is indeed due to pooling, touchpad or keypad, both are time critical for something running on 30fps.
For example, my first attempts ran on emulator at 200fps, but only 16 fps on calc. I removed keypad pooling and it then raised to 120fps.
notice : This problem is not visible on emulator due to not emulating mapped memory access delays.

I then managed to create a keypad pooling without using an interruption handler. It uses the ndless code of sleep.c that setup an arm co-processor to wakeup the arm processor when a certain time has arrived. This let me cleverly set my keypad pooling without spamming at each frame.

Sorunome · « **Reply #26 on:** December 24, 2013, 08:39:58 pm »

Wow, this is insanley fast&smooth

Great job!

Vogtinator · « **Reply #27 on:** December 24, 2013, 08:50:11 pm »

Quote

I then managed to create a keypad pooling without using an interruption handler. It uses the ndless code of sleep.c that setup an arm co-processor to wakeup the arm processor when a certain time has arrived. This let me cleverly set my keypad pooling without spamming at each frame.

Or I register a function as a keypad interrupt handler which sets some bits of keys currently pressed to 1.
I'll have to implement interrupt support for the FPS counter (timers

) anyway...

TIfanx1999 · « **Reply #28 on:** December 24, 2013, 09:46:42 pm »

This is looking pretty impressive. Nice work Vogtinator!

fb39ca4 · « **Reply #29 on:** December 24, 2013, 11:41:44 pm »

The Nspire has timers you can use to calculate framerate/frametime.

http://hackspire.unsads.com/wiki/index.php/Memory-mapped_I/O_ports#900D0000_-_Second_timer

Author Topic: nGL - a fast (enough) 3D engine for the nspire (Read 266038 times)

Matrefeytontias

Re: nGL - a fast (enough) 3D engine for the nspire

Vogtinator

Re: nGL - a fast (enough) 3D engine for the nspire

Matrefeytontias

Re: nGL - a fast (enough) 3D engine for the nspire

Vogtinator

Re: nGL - a fast (enough) 3D engine for the nspire

Matrefeytontias

Re: nGL - a fast (enough) 3D engine for the nspire

Vogtinator

Re: nGL - a fast (enough) 3D engine for the nspire

Matrefeytontias

Re: nGL - a fast (enough) 3D engine for the nspire

Levak

Re: nGL - a fast (enough) 3D engine for the nspire

DJ Omnimaga

Re: nGL - a fast (enough) 3D engine for the nspire

Vogtinator

Re: nGL - a fast (enough) 3D engine for the nspire

Levak

Re: nGL - a fast (enough) 3D engine for the nspire

Sorunome

Re: nGL - a fast (enough) 3D engine for the nspire

Vogtinator

Re: nGL - a fast (enough) 3D engine for the nspire

TIfanx1999

Re: nGL - a fast (enough) 3D engine for the nspire

fb39ca4

Re: nGL - a fast (enough) 3D engine for the nspire