Home/ Questions/Q 8186545
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-07T02:14:44+00:00

I want to do parallel rendering with 2 GPUs. So a readback from GPU1

  • 0

I want to do parallel rendering with 2 GPUs. So a readback from GPU1 and then drawing pixels to GPU2 are needed.

I created two windows in each screen with its own GPU connected. And there are two threads associated to each window.

However, the readpixel+drawpixel is a bottleneck. So a async PBO method is considered: 2 PBOs for reading back and 2 PBOs for drawing back in alternative way.

My question is:

  1. Could Pointer returned from glMapBufferARB be used in another thread and different GPU?
  2. If not, I must copy data to main memory and copy it to another GPU, the bottleneck will be CPU->GPU copying. Is there any better idea?
Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Yes, pointer form glMapBuffer can be used by any thread – even without GL context. Just remember to synchronize threads and don’t call glUnmapBuffer before thread finishes its job with pointer.h

    • 0