[osg-submissions] DDS cubemap support

[Smeenk, R.J.M. (Roland)]

Robert,

Yes, that was one of my thoughts too, but in that case we need to add
support for handling mipmap levels per depth level.

Roland

> -----Original Message-----
> From: osg-submissions-bounces at lists.openscenegraph.org 
> [mailto:osg-submissions-bounces at lists.openscenegraph.org] On 
> Behalf Of Robert Osfield
> Sent: vrijdag 28 september 2007 9:26
> To: OpenSceneGraph Submissions
> Subject: Re: [osg-submissions] DDS cubemap support
> 
> Hi Roland,
> 
> I'm only online briefly before I head out on the school run.  
> My first quick though is that rather than having 4 parameters 
> in your extended
> data() method we should just treat the 3d image layer as the face.
> The reason why we can do this is that texture cube maps can't 
> be 3d textures and visa versa.
> 
> Once I get back I'll do a proper review.
> 
> Robert.
> 
> On 9/28/07, Smeenk, R.J.M. (Roland) <roland.smeenk at tno.nl> wrote:
> >
> >
> > A couple of weeks ago I decided to make a minor modification to the 
> > dds reader for supporting cubemaps.
> > This quickly turned into a somewhat larger modification 
> than I expected.
> >
> > Here's a list of the things I changed:
> >
> > -osg::Image                        Supports for multiple data faces
> > (including possible mipmaps)
> > -osg::Texturecubemap     Collapsed image array inside into 
> a single image
> > with 6 faces
> > -osg::Texture                     Added face as parameter 
> to apply methods
> > -osgUtil::cubemapgenerator   Now using single 6 face image
> > -osgFX::specularhighlights    Now using single 6 face image
> >
> > -dds plugin
> >     -loading a cubemap into an 6 face image
> >     -writing a 6 face image as cubemap
> >
> > -osg plugin
> >     -loading new style cubemaps
> >     -loading old style cubemaps with automatic conversion 
> to new style 
> > cubemap
> >     -writing new style cubemaps
> >
> > -ive plugin
> >     -loading new style cubemaps
> >     -loading old style cubemaps with automatic conversion 
> to new style 
> > cubemap
> >     -writing new style cubemaps
> >
> > -osgcubemap example             Now using a single 6 face image
> > -osgvertexprogram example    Now using a single 6 face image
> >
> > I tried to keep the impact of the interface changes a low 
> as possible 
> > by using default parameters. However this is dangerous in 
> some cases. 
> > This is especially the case with osg::Image::data() which 
> exists in two variants:
> > inline unsigned char* data(unsigned int face) inline unsigned char* 
> > data(int column, int row=0, int image=0, unsigned int
> > face=0)
> >
> > For accessing specific face data you will have to 
> explicitly set it to 
> > an unsigned int to end up using the correct method.
> > unsigned char* facedata = data((unsigned int)2);
> >
> > Possible future additions related to these changes are:
> > -Convert TextureArray to using a multiple face image, but 
> there exists 
> > no multiface image format that I know of.
> > -.hdr loader support for cubemap loading/writing 
> -Cubemapgenerator for 
> > converting a cross image into a cubemap (with configurable face 
> > layout)
> >
> > kind regards,
> >
> > Roland Smeenk
> >
> >
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> >
> >
> >
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