“1 OpenGL errors detected 0 : (1285) Out of memory” after tens of thousands of Loop (inside each Loop: use VTK, new Window, Render, VolumeMapper then delete them))

[Dark_Photon]

@gpu22

and do you know the inside memory layout or management of OpenGL? different on various platforms and drivers?

No. I’m not a driver developer. My experience is limit to being an OpenGL application developer. Mostly with NVIDIA’s OpenGL driver, both on Linux and Windows.

it seems that OpenGL is not able to alloc on the very large enough contigous VRAM…

While that may be one possible cause, there are others. For just a few of the many examples (with NVIDIA drivers), see this thread. Search for GL_OUT_OF_MEMORY:

Bindless Textures - resident textures Limits

From Bindless Texture documentation, it is written the following about maximum amount of resident textures: The amount of storage available for resident images/textures may be less than the total storage for textures that is available. As such, you should attempt to minimize the time a texture spends being resident. Do not attempt to take steps like making textures resident/unresident every frame or something. But if you are finished using a texture for some time, make it unresident. Is ther…

I’d suggest you see what the driver is telling you about your specific error. It may not be what you think.