Regarding SetWindowSize

[ghost]

I noticed the following in SetWindowSize in gltest.go.

// Need to wait for the reshape event, otherwise it happens at an arbitrary
// point in the future (some unknown number of SwapBuffers())
//glfw.PollEvents() // Doesn't work
//glfw.WaitEvents() // might be racy (ideally, we'd need to send an event)

Have you tried calling glfw.Disable(glfw.AutoPollEvents) during setup?
By default, glfw implicitely calls PollEvents when you call SwapBuffers. By disabling AutoPollEvents, you get manual control over your calls to PollEvents.

[pwaller]

I don't think that will help. The problem is that when you run SetWindowSize, I'm guessing Reshape doesn't get called until the WM notification that there was a resize comes through to glfw. So when doing WaitEvents() if there was any non-resize event that happens to be waiting in the pipeline, SwapBuffers() or PollEvents() (or anything else) might not call Reshape. Hence what I settled on: Sleep (hopefully long enough for the WM to kick in) followed by SwapBuffers (which I've verified then calls Reshape() as I expect). What might be better is if there was a way to trigger the resize, then another event which we can reliably wait for, such as a mouse move event at a specific pixel, or something along those lines (preferably something that wouldn't happen by accident..)

[ghost]

If I understand you correctly, the purpose of that function is to force a resize and then pause execution of the test/example until the resize has actually propagated to the reshape function?

[pwaller]

Exactly. I don't know of a non-complicated, 100% reliable way to do that. I imagine waiting 10ms will get pretty damn close, though, without impacting execution time significantly. If you can think of other non-racy ways to do it I would love to know.

[ghost]

I'll give it some thought.