Hi,
I’m trying to optimize an offscreen rendering in my application. I currently
rely on glReadPixels to get the rendered image but in its more direct form is a
blocking call.
I want to take advantage of PBO to make this copy asynchronous and take less
time to render the scene.
However, when trying to glMapBufferRange I always get a null ptr and if I check
the GL error code I have “Invalid operation”:
You can have a look at the code here -> https://pastebin.com/KNKZgeQ0
I’m on Qt 6.8.0 and I’m still using OpenGL because I’m really stick to it on
this application.
Is anyone using PBO’s to async copy from GPU to CPU from a framebuffer with Qt?
Thanks in advance!
Nuno
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