Shadertest #1
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Shadertest #1
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This now uses 4 textures. Before the trigger, we alternate between a white box in the top left, and a black screen. This is a "clock" of the frames. After the trigger, we do the same, but also draw a white box in the bottom left.
Host PC sends 'g' to the Arduino to signal it to switch LEDs, take a time diff, and send it back over serial.
Calling glFinish at the end of repaint reduces e2e latency by about 1 frame (~4ms).
Rather than have everything in the same loop and thread, this splits off a separate thread for drawing to the display, with two atomic reference. First to a trigger boolean to know when to draw the white square, and second to a drawing delay to be able to report back the value to the main thread.
Gets rid of the newline in the CSV output log.
Just so we can see a frame clock in the swap_interval=0 setting.
Sequence diagram is generated using PlantUML using the web-service:
https://www.planttext.com/
The markup for the UML diagram is:
```
@startuml
Host->ASG: Switch Eye Command
note over ASG: toggle IR LED, t_start = now()
Host->Host: poll EyeLink for new samples
ASG->ASG: sample = photodiode level
note over Host: new EyeLink Sample > DELTA
Host->Display: draw white box
note over ASG: sample > trigger level, t_end = now()
ASG -> Host: t_end - t_start
@enduml
```
Takes the results.csv and outputs a histogram, CDF, and boxplots to visualize the distribution of latencies.
When collapsed, it's harder to search for keywords. Given it doesn't take a ton of space, might as well show the information.
Reads gaze data using ZMQ
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Display.cc contains the shader I tried to write which is almost an exact copy of the working C++ code (aided by opencv) in equitest.cc. In trying to narrow down the source of the bug, I'm only playing around with the Y channel of the image and only for a particular head orientation (so I know exactly what it SHOULD look like).