topic Re: Feature Request: GL_AMD_pinned_memory in Graphics

Feature Request: GL_AMD_pinned_memory

idata — Tue, 19 Feb 2013 12:38:41 GMT

Hi,

Is it hard to implement GL_AMD_pinned_memory?

It would be very nice for my game as I need to upload tons of small buffer updates. At the moment, I call glMapBufferRange(unsync) for every buffer update, but this command wastes most of the time of my gpu thread.

I know it is possible for such a GL_STREAM_DRAW buffer to map once and continue on using this pointer after unmapping, so I guess the hardware should be able to do this extension. There is also a _huge_ speedup in this hacky way, but I may never release such a hack...

By the way, uploading all of the update at once wouldn't be easy. I'll usually need to change some states and always call glDraw between two buffer updates. glDraw could be easyly delayed, but as I have to change the state between, It would be hard to delay the state changes.

I've tested my parts on a Sandy Bridge GPU.

Thank you,

Markus

Re: Feature Request: GL_AMD_pinned_memory

ROBERT_U_Intel — Tue, 19 Feb 2013 18:37:47 GMT

Hi Markus.

I will find out and get back to you.

Re: Feature Request: GL_AMD_pinned_memory

idata — Tue, 26 Feb 2013 19:47:06 GMT

Hi Robert,

Thanks for your support.

Has anybody answered?

Markus

Re: Feature Request: GL_AMD_pinned_memory

idata — Fri, 15 Mar 2013 11:16:38 GMT

Hello

Sorry, I found another thread requesting for this feature, so sorry for spam 🙂

http://software.intel.com/en-us/forums/topic/279618 OpenGL - Pinned Memory Transfers | Intel® Developer Zone

(but also without answer)

Markus