Hi Ken,
The callback is called on every frame, the callback is then
responsible for check to see if the subload is required. At least
that's what I remember, its about 5 years since I wrote or used the
code :-)
Robert.
On 10/19/07, Sewell, Kenneth R Civ USAF AFRL/RYZW
<[EMAIL PROTECTED]> wrote:
>
>
>
>
> Thanks for the response. If you don't mind could you answer a couple more
> questions?
>
> What triggers the callbacks? How/where is the new data to be subloaded
> associated with the callback function?
>
>
>
> Thanks.
>
>
>
>
> Hi Ken,
> Basically you just need to setup a TextureSubloadCallback for your specific
> type of texture(1D,2D,3D).
> This allows you to override the load and subload methods that you would
> encounter in gl. Then set the
> subloadcallback to your texture using:
>
> Texture*D::setSubloadCallback(SubloadCallback* sb);
>
>
> Overrides are something like the following:
> load:
> ////////////////////////////////////////////////////////////////////////////////////
> void UpdateTextureCallback::load(const osg::Texture3D&
> texture,osg::State& state )const
> {
>
> texture.getExtensions(state.getContextID(),false)->glTexImage3D(GL_TEXTURE_3D,
> 0,
> GL_RGBA,
> _textureWidth,
> _textureHeight,
> _textureDepth,
> 0, GL_RGBA,
>
> GL_UNSIGNED_BYTE,
> (unsigned
> char*)_tm->dataField);
>
> }
> and subload :
> //////////////////////////////////////////////////////////////////////////////////////////////
> void UpdateTextureCallback::subload(const osg::Texture3D&
> texture,osg::State& state) const
> {
>
> texture.getExtensions(state.getContextID(),false)->glTexSubImage3D(GL_TEXTURE_3D,
> 0,
> 0,0,0,
> _textureWidth,
> _textureHeight,
> _textureDepth,
> GL_RGBA,
> GL_UNSIGNED_BYTE,
> (unsigned char*)_tm->dataField);
>
> }
>
> You'll have to adjust this for your texture type (this is ours for 3D
> textures) but this should give you a general idea.
> biv
>
>
> On 10/19/07, Sewell, Kenneth R Civ USAF AFRL/RYZW
> <[EMAIL PROTECTED]> wrote:
>
>
> Is there a good example of texture subloading in OSG? I have a large
> image and just want to replace small tiles of the texture. Can anyone
> give me a few starting pointers?
>
>
> Ken.
> _______________________________________________
> osg-users mailing list
> [email protected]
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
>
> _______________________________________________
> osg-users mailing list
> [email protected]
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
>
_______________________________________________
osg-users mailing list
[email protected]
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
