Hrm, im not so certain, unless you are referring to a bug within the
QC GLSL patch itself, and not globally for GLSL, as the video input
patch I am using to feed my QC plugin uses the YUV601 colorspace, and
things are working fine from the plugin side of things. (although
there *are* issues globally with vertex samplers, as reported on the
GL list, which ive seem to have run in to).
You could probably test this by using an animated 'render in image'
patch, which should have different colorspace than a QT/Video playback
device, ill let you know what I come up with.
Would you be able to do your project with a custom QC plugin rather
than the GLSL patch? It might be a bit more work, but it should let
you use VDM.
On Apr 24, 2008, at 3:38 AM, Chris Wood wrote:
I looked into this a while back in some depth, and it looks to
actually be colorspace related. I found that anything with
GenericRGB works fine with a displacement shader, but anything else
device specific or with LinearRGB would crash QC. I've filed a bug
for it under 5829909.
Seeing as I'm working on a project that requires displacement
mapping, I've been thinking about ways around the bug. Am I right in
thinking that with different colorspaces, the base texture data is
essentially the same but the way it's treated differs depending on
the colorspace information? And if so, how would I go about changing
the colorspace back to GenericRGB in a cocoa app without too much of
a penalty hit?
Chris
On 24 Apr 2008, at 07:10, vade wrote:
Hi. Ive taken another look at this issue, and have successfully run
this vertex shader (a variant thereof) within a QC plugin I am
developing.
The shader within the plugin works as expected with both video and
image sources, however it does not work within the GLSL patch
object with video sources (from the video input of QT playback
patches, only the image loader patch works as expected).
So something in the GLSL patch object is not happy wrt texturing,
whereas the GLSL shader within a QCPlugin seems to work just fine...
ill make a simple plugin and shader case and file a radar sometime
soon.
On Nov 5, 2007, at 6:14 PM, Pierre-Olivier Latour wrote:
I looked into this composition and it seems indeed that some types
of images do not work correctly when textured from inside a vertex
program, although they work fine inside the fragment program (at
least on my X1600).
This looks like a potential GLSL issue, so I cannot think of any
workaround.
<Vertex_Displace_Test_04-11-07.qtz>
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