Hi J.P.,
Let's say you have 1000 textures. You can't create 1000 PBOs as this would
consume far too much memory.
What you do is play with 2 PBOs. Have a look at the diagram here, in the figure
called Streaming texture uploads with 2 PBOs:
http://www.songho.ca/opengl/gl_pbo.html#unpack
You
Hi Fred,
On 08/12/10 20:22, Fred Smith wrote:
Hi J.P.,
Let's say you have 1000 textures. You can't create 1000 PBOs as this
would consume far too much memory.
Can you explain at a higher level what you want to do. Do you just have
1000 textures you want to upload once? Or do you have 1000
Hi Fred,
The PBO support built into osg::Texture/osg::Image for passing image
data from the osg::Image to the texture, and does not presently
support reading the result back.
When doing read back using PBO's the situation is a little more
convoluted than when passing data from main memory to the
Hi Robert,
Let's leave GPU - CPU transfers aside. I don't mind if they are slow.
You usually have to use 2 PBOs.
If I use a single PBO to upload texture data to the GPU, performance will be
very low.
It seems to me I have two ways to do CPU - GPU transfers efficiently.
1) Use 2 differents
Hi Fred,
I have too much other work on right now to go chasing supports threads
at a low level, I have time to point users in roughly the right
direction, but then have to get back to work - I have 3.0 to get out
the door.
Robert.
On Mon, Dec 6, 2010 at 1:16 PM, Fred Smith osgfo...@tevs.eu
Hi Fred,
what bandwidth are you trying to achieve? We've had no issues with
updating multiple osg Images from camera input with just a PBO attached
as per e.g.:
osg_image_buffer[i]-setPixelBufferObject(new
osg::PixelBufferObject(osg_image_buffer[i].get()));
where osg_image_buffer[i] is a
fred_em wrote:
Hi,
I am confused about how to use PBOs in OSG. I browsed the forum quite a bit
but still can't make my code work.
1) GPU - CPU pixel transfers
As I understand it, an osg::Image with an osg::PixelBufferObject cannot be
used (yet) to read FBO contents. I have actually
Hi,
I am confused about how to use PBOs in OSG. I browsed the forum quite a bit but
still can't make my code work.
1) GPU - CPU pixel transfers
As I understand it, an osg::Image with an osg::PixelBufferObject cannot be used
(yet) to read FBO contents. I have actually checked that and could
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