stereo library in opengl 2.0+

seleters

stereo library in opengl 2.0+

in Library and Tool Development • 1 year ago

Hi,
I'm trying to adapt a stereo library created in processing 1.5 for processing 2.0, since my sketch is too slow in processing 1.5 but I'm having a hard time trying to figure out what to change since openGL libraries are changed.

Here's the code for the two main classes:
old version:
http://pastebin.com/gWmK0YVc
http://pastebin.com/4Cnjuu2d

"new" version:
http://pastebin.com/8Fq7jSzX
http://pastebin.com/C0n3A8PM

Can someone help me?
By now I get an NPE exception and a "Already called beginDraw()" message, but I can't find out what triggers it.

Thanks.

Replies(6)

andres

Re: stereo library in opengl 2.0+

1 year ago

Hello, how does your library works? From what I see in the code, the Stereoscopia class checks if the main renderer is of type Teatro, in which case the stereo is enabled. Do you render the stereo scene into a Stereoscopia offscreen buffer? Could you post a short snippet of a sketch using the library where you show the initialization steps?

One problem that I can already see is that you create an OpenGL context in Teatro.allocate(), which is probably conflicting with the context created by jogl.

seleters

Re: stereo library in opengl 2.0+

1 year ago

Thank you for your answer. I haven't written the library so I'm not sure I completely get how it works.

Anyway yes, Teatro should be the renderer, it's a virtual theatre using quad buffering. I'm not sure if it renders the scene into an offscreen buffer.

Here's a sketch using the library:

Stereoscopia stereo;
void setup() {
size(displayWidth, displayHeight, "stereoscopia.Teatro");
stereo = new Stereoscopia(this, iod, fov, nearPlane, farPlane);
stereo.setManual(false);
stereo.setCamera(0, 0, 700, 0, 0, 0, 0, -1, 0);
}
void draw() {
stereo.beginScene();
background(0);
sphere(200);
stereo.endScene();
}

what context should I use to make things work?

I've tried using pg objects inside the sketch with no libraries to get the left and right image, but I can't tell the renderer to use 4 buffers... here's what I've tried: http://pastebin.com/5mZhfE5J

andres

Re: stereo library in opengl 2.0+

1 year ago

Ok I see one of the problems,with the library: you need to create your OpenGL context with capabilities.setStereo(true), but in Processing 2.0 the context initialization is hidden inside PGL.initPrimarySurface(), which is difficult to override...

The other problem is that the library uses the fixed-function pipeline (glMatrixMode, gluLookAt), while the GL-renderers in Processing (P2D/P3D) moved over to a fully shader-based pipeline, this will cause problems as well.

Is this library available somewhere for download?

seleters

Re: stereo library in opengl 2.0+

1 year ago

Sadly I don't have the jar here, but here is the source code:

http://pastebin.com/gWmK0YVc
http://pastebin.com/4Cnjuu2d

can't make a jar file cause these files do not compile anymore.

I've been trying using P3D as a renderer and creating the stereo images inside the sketch, but I can't find a way to tell the openGL context to use quad buffering.

Here:

drawable.set(pgl, factory.getGLDrawable(parent, capabilities, null));

drawable is now protected and the getGLDrawable method doesn't exist anymore.

seleters

Re: stereo library in opengl 2.0+

1 year ago

jar file: http://www.mediafire.com/?zza7xkhmt2h23vs

andres

Re: stereo library in opengl 2.0+

1 year ago

Thanks. Getting libraries that set the capabilities of the GL context, such as this one, to work properly will probably need some additional API adjustments in Processing itself. I will post back once I make some progress about it.

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