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analogdevicesinc / Pixelpulse2

Pixelpulse2 is a user interface for analog systems exploration.
Mozilla Public License 2.0
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Pixelpulse2 Waveform Glitches #172

Open jonpearson opened 8 years ago

jonpearson commented 8 years ago

I've seen glitches on the generated waveforms while making videos, and originally attributed them to an interaction between Pixelpulse and Camtasia (and possibly partially due to problems with my old PC), but have recently observed them on a new PC when not running Camtasia. Some examples are shown in the following screenshots. I had the system set up to source voltage on Channel A and measure voltage on Channel B.

m1k glitch 1 m1k glitch 2 m1k glitch 3 m1k glitch 4

dNechita commented 8 years ago

I have seen this behavior on systems where there was no graphic acceleration (such as virtual machines) but Qt managed to switch to a software graphic renderer. It would help to know what kind of graphic renderer this system has and which version of OpenGL the renderer supports. @jonpearson could you please use glview to get this kind of information and post it here? You should look for the first opengl version that doesn't show 100% feature complete, like version 4.2 in the picture below and expand it when taking the screenshot. Also the information from the panel on the right is useful. glview

Thank you, -Dan

jonpearson commented 8 years ago

Hi Dan,

Here's the screenshot:

opengl screenshot

Thanks.

--Jonathan

dNechita commented 8 years ago

Thanks Jonathan!

It looks that your system has more than enough graphic resources. I will keep investigating.

Once you start seeing these glitches, do they persist for a while? or the glitch happens once in a while for a very short period of time?

jonpearson commented 8 years ago

Hi Dan,

They occur for short time intervals, but keep happening over and over. It took a number of tries to get a reasonable screen capture because their occurrence was random and short-lived. Their frequency was variable as well. When using Camtasia they got much more frequent when I began recording the screen.

Hope this helps.

--Jonathan

luciansin commented 8 years ago

Hi all, If you want to see more often a glitch you can make a full screen window, activate X-Y plots, run play and then activate any menu from the window (I kept activated the settings menu). See attached picture: glitches

Settings are source voltage for both channels. Lucian