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YaleO'neil

I’m building a system for live performance where I may need many different shader modes. To avoid having one very long shader file with dozens of branches, I’d like to preload multiple jit.gl.shader objects and simply switch them at runtime. For this to be reliable on stage, I need to be sure about when compilation actually happens, and whether switching shaders ever triggers recompilation.

• When exactly does a jit.gl.shader compile its code? Is it compiled immediately when I read a file or set the @file attribute (when autowatch is 1), or only once it is bound to a jit.gl.mesh (or other OB3D)? Otherwise, if autowatch is 0, does it just sit idle until I explicitly send "compile" or "read"?

• Is “compile” and “bind” treated as separate steps in Jitter (like OpenGL’s glCompileShader vs. glUseProgram)? “For example, if I change the @shader attribute of a jit.gl.mesh from phongShader to blinnShader, does that trigger any recompilation, or does it simply bind an already compiled program?”

• Does the autowatch attribute affect this process? My understanding is that autowatch 1 only recompiles when the source file changes on disk, not when shaders are bound/unbound. Is that correct?

I’ve read the reference docs, and while they imply this separation, they don’t spell it out. I’d love to have a confirmation of how jit.gl.shader handles compilation vs binding, and exactly what role autowatch plays. 

I’m building a system for live performance where I may need many different shader modes. To avoid having one very long shader file with...

jitglshader-compilation-vs-binding-and-autowatch-behavior

 jit.gl.shader — compilation vs. binding, and autowatch behavior

Martin Daigle

Hello, I made this little scrambler which randomly re-arranges sections of an image. Love the use of jit.scisors, and jit.glue, and I'm wondering if it there is potential for an alternative in gl. 

Hello, I made this little scrambler which randomly re-arranges sections of an image. Love the use of jit.scisors, and jit.glue, and I'm...

jitgl-row-and-column-scrambler

Jit.gl. row and column scrambler.

John M. WARTS

For a theater project, I need to retrieve a video stream via a Blackmagic 3G Recorder; so far, no problems.

I'm processing the video and want to send it back via the network to another Mac with Millumin (the NDI input appears and the stream goes through).

With this network and [udpsend 192.168.0.XX 1024] (the IP address of the other Mac and the Millumin OSC input port), I want to control Millu to launch the next columns and other effects. 

It works, but I lose the connection quite quickly. My solution is to jit-bang the [port 1024] message, and it works, but it doesn't seem very secure. 

Are you aware of this problem? Could it be Millu? I've already used [udpsend between Macs, from Max to Max, and haven't had this problem].

Thank you in advance for your help. Best regards.

Hi everyone, 

For a theater project, I need to retrieve a video stream via a Blackmagic 3G Recorder; so far, no problems.

I'm processing...

udpsend-to-millumin-via-ethernet

[udpsend] to Millumin via ethernet

Julien Bayle

beside making music with capacitive mushrooms driving karplus strong within a pi's RNBO export, I'm now focusing on a new feature for my late developments for a new a+v live performance.

Using OpenFrameworks for generative & procedural visuals is a strong way I already work with for many projects. I'm talking about agents drawing on the screens, different rules & contexts etc.

I built a small but efficient system for having different context, using OSC from Max for control purposes etc. Very cool.

Textures traveling through Syphon. Solid... on the paper side.

Actually, I cannot have a constant fps on Jitter's side and the classic (but sometimes too much theoretical) moving element from left to right is PERFECTLY drawn on OF side BUT on Jitter side... some subtle but visible stutter effect. I mean... the circle travel sometimes jitter a very bit at slow speed. 

Most noticeable at 1080p than 720p and yes that could be performances problem too (M1 Max 64Gb) but OF side is really showing a ... PERFECT movement. Even with A LOT of circles etc.

Overdrive + Scheduler in Audio Interrupt enabled (tried also to disable them)

I'm wring through FBO on OF. Very conventional.

Max/Jitter pulling Syphon textures asynchronously

 within its UI scheduler, while openFrameworks pushes frames at its own perfectly stable GPU clock.

 lacks frame-perfect sync, causing micro jitter even at high FPS.

My question: should I expect a better quality rendering with any stutter or that way, if some tested it, always involves this kind of things ?

Shouldn't I instanciate syphon things on Max side on a different way ?

Let me know if you want variants for your forum posts or internal notes.

Any ideas, words, discussions around it would be very cool :-)

Hi there,

beside making music with capacitive mushrooms driving karplus strong within a pi's RNBO export, I'm now focusing on a new...

of-to-syphon-to-max

OF to Syphon to Max

syrinx

Hi folks! When using gl2 as the render engine, it's possible to query the maximum texture size supported by your GPU by passing the message "glget max_texture_size" to jit.gl.sketch (as noted in 

). When using glcore, however, jit.gl.sketch throws an error:

jit_gl_sketch: doesn't understand "glget"

Is there some other way to retrieve the maximum texture size while using glcore?

Hi folks! When using gl2 as the render engine, it's possible to query the maximum texture size supported by your GPU by passing the message...

cant-query-maxtexturesize-via-jitglsketch-while-using-glcore

Can't query max_texture_size via jit.gl.sketch while using glcore

Sabina Covarrubias

Can someone please help me understand how to avoid this visual “jitter” or “noise”? It looks like small squares or tearing, whereas it should appear as a smooth, flat surface.

, or any type of quads or triangles. I specifically need to use these draw modes.

Is there any trick to avoid this visual noise while still using 

[Image: Screenshot 2025-06-25 at 12.54.09.png ]
Hello,

Can someone please help me understand how to avoid this visual “jitter” or “noise”?...

how-to-avoid-visual-noise-in-quands-or-triangles-polygon-drawmode

How to avoid "visual noise"  using jit.slide in quads or triangles, or  polygon  draw_mode ? 

it made a while. Hope everyone fine here. 

A couple of questions more C74 oriented to.

I have some habits using GL contexts and GPU things (like bypassing jit.gl.pix etc) for saving GPU (& CPU if some parameters are flowing too) but I wanted to clarify them. For instance, jit.fx... family, as a comparison, got a bypass internal attributes/features , so nowadays, this is the way, I understand.

Does a jit.gl.node consume something if it is "directed" by changing the drawto to a null context ? Is it "better" to disable it (enable 0) ?

Does a GL 3D objects (I mean gridshape, sketch etc etc) has to be disable too if it is rendered by a jit.gl.node which have been disabled ? More precisely, do I have to disable and/or switch drawto  to null the jit.gl.node AND disable GL 3D objects too ?

I used to do both, but maybe the rendering context (jit.gl.node) is the only one to be switched (drawto, etc)

Maybe, some other questions will come here.

Hi mates,

it made a while. Hope everyone fine here. 

A couple of questions more C74 oriented to.

I have some habits using GL contexts...

gl-rendering-context-switching-gl-objects-and-cpugpu-saving

GL Rendering context switching, GL Objects & cpu/gpu saving

aartcore

Is there a way to rotate the anim.path like the jit.gl.path with the orient function. I want the path with pathstyle ribbon to lay flat. If i use the rotatexyz on the the jit.gl.path the animation of the gridshape doesn't follow..

Is there a way to rotate the anim.path like the jit.gl.path with the orient function. I want the path with pathstyle ribbon to lay flat. If...

Jitter Forum