Hi,
The entries of GLBufferObject can't be erased because the images
(BufferData) use
their index (_bufferIndex) to retrieve their offset in the GL buffer.
A Boolean or a copied count in each buffer entry could do the job.
It was the first solution I tried (hence the BufferData parameter of
GLBufferObject::setBufferEntryUsed).
I changed for a global counter (in GLBufferObject) because I didn't want
to loop through
the buffer entries to count the used/unused entries.
I try ...
On 23/01/2013 13:55, Robert Osfield wrote:
Hi Lionel,
I have just reviewed your changes and don't feel that it's an elegant
solution, and could easily lead to confusion and misuse down the line.
I haven't yet settled upon a solution but it feels to be that that the
GLObjectBuffer::BufferEntry data structures themselves should be
marked as no longer required, and once all the BufferEntry objects
have been used and no longer required have the whole GLObjectBuffer
released. Perhaps simply deleting the BufferEntry would be sufficient
for this purpose, this way once the GLObjectBuffer has an entry
_bufferEntries it's should be able to be released safely, or perhaps
the modifiedCount could be used in conjunction with a copied count.
Thoughts?
Robert.
On 10 January 2013 15:01, Lionel Lagarde <[email protected]> wrote:
Hi,
Happy new year !!!
Here is the fix for the multiple PBO creation/destruction happening when
paging textures.
The problem was:
the pager loads X.osgb containing the textures A (A.png), B (B.png) and C
(C.png).
the incremental compile operation sets the PBO of the images (the same PBO
for every image)
during the database compilation, for each textures:
a GL buffer object is created and the three images are uploaded into
the GL buffer content is used to as source of glTexImage
because the "copy data and release GL buffer object" member of the images
buffer object is true, the GL buffer object is released
i.e. every texture compilation creates/uploads images/destroys the GL buffer
object
In this fix, during the first texture compilation, the GL buffer object is
created and the images are uploaded. During the last texture
compilation, the GL buffer object is destroyed.
I introduced a new counter in GLBufferObject: how many buffer entries of the
buffer have not been used.
Because the counter is in GLBufferObject, it is only valid for the context
of the GL buffer.
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