Could also be a memory leak + some texture optimizations. The image
from string patches use the CPU side to draw the text with typical
Quartz text rendering if I am not mistaken, and probably use some
texture optimization tricks to keep contents from being copied many
times to the GPU (client storage and texture range). If there is a
memory leak somewhere it could make the contents of the texture
corrupt. Just a thought?
Can you see if your app or QC leaks memory over the duration it is
running? You can simply use activity monitor and just note the start
real memory usage and see what it is like after your normal runtime.
You can also, if you are willing, run your QC app from the OpenGL
Profiler, and then when you see your issue, set a breakpoint and
inspect the texture resources manually (by looking at the textures and
seeing if they are actually corrupt, or if the glitch is a different
area, ie, not in the texture itself).
Good luck.
On Jan 9, 2010, at 6:52 PM, Christopher Wright wrote:
Mighty QC List, I have a visualization that accumulates multiple
words over time, and the once the comp has been running for a while
it starts to draw words that are corrupted into strange blocks.
In the image notice that some of the word sprites are drawn as
distorted blocks or lines although the original string is feeding
into the sprite intact. Any hunches on this?
<Screen shot 2010-01-09 at 1.38.12 PM.png>
Are you on 10.5 or 10.6? Which GPU are you using? What kind of
uptime does it take for this to set in ("a while" could equal a few
seconds or a few days)? Can you post the composition (or one like
it that reproduces the issue)?
If you're on 10.6, give it a spin on 10.5 -- the drivers on 10.5
seem much more reliable (in my completely unscientific opinion and
limited hardware experience -- just a GMA950 and an NVidia 8800), so
it could be GL drivers to blame. It could be QC4 to blame (or QC3,
if you're on 10.5). It could be bad vram (in which case it's
specific to just that machine -- however, I'd imagine bad vram would
manifest itself elsewhere as well ;)
--
[ christopher wright ]
[email protected]
http://kineme.net/
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