Can't use glReadPixels

GlowingApple

I'm trying to use glReadPixels in my python3 application.

Here's a segment of my code:

self.vp = QOpenGLVersionProfile()
self.vp.setVersion(2,1)
self.glFunc = QOpenGLContext.currentContext().versionFunctions(self.vp)
self.glFunc.glReadPixels(...)

Regardless of what I pass to the function, I get an error:

AttributeError: 'QOpenGLFunctions_2_1' object has no attribute 'glReadPixels'

Any ideas what I'm doing wrong?

jsulm

@GlowingApple said in Can't use glReadPixels:

self.glFunc

Did you check what self.glFunc contains?

print(self.glFunc)
print(dir(self.glFunc))

GlowingApple

print(self.glFunc) returns

<PyQt5._QOpenGLFunctions_2_1.QOpenGLFunctions_2_1 object at 0x12217e5e8>

and print(dir(self.glFunc) returns a huge list: https://pastebin.com/QB4fjCBR

Searching through the list there is no glReadPixels method. There is a GL_READ_PIXELS, but it's not a method, just an int. I searched for other similar functions containing read and/or pixels, but couldn't find anything else that seemed suitable.

Is glReadPixels not available in OpenGL 2.1?

I'm using Qt 5.8.0 and PyQt 5.8.0 on macOS 10.12.4 by the way.

jsulm

@GlowingApple As far as I know glReadPixels is part of OpenGL 2.1
But I'm not an OpenGL expert, maybe somebody else can help.