[osg-users] DDS Textures

[Robert Osfield]

Hi David,

On 27 October 2015 at 23:24, David Heitbrink <david-heitbrink at uiowa.edu>
wrote:

> I have two separate issues with DDS textures. First and the most annoying
> is after moving from  OSG-3.2.x to OSG-3.4.0 my grayscale textures now show
> up red. I did not change the source textures or models between versions.
>

I don't think this will a DDS plugin issue.

Are you compiling the OSG with GL3 profile?  There is now GL3 specific code
path in src/osg/Texture.cpp that maps GL_INTENSITY and GL_LUMINANCE to
GL_RED, as modern versions of OpenGL have deprecated these old single
channel channels.



> I have another problem with mip mapped dds textures. I have a number of
> textures that have mip maps, stepping through the code after they are
> loaded, it looks like OSG has the texture setup to use the mip maps. What I
> am seeing it is clearly not using the mip maps. I modified a texture to
> alternate the color on every level. I got the largest texture the entire
> time. I also used a shader to turn the model solid red, if it had only 1
> texture level, and I got a red model. I suspect this might be more of a
> driver/video card issue (Quadro K5000).
>

The DDS plugin used to discard the mipmap, but not honours it.  The OSG
will only render with mipmap if your have the osg::Texture MAG_FILTER set
to one of the *_MIPMAP_* enum's, LINEAR or NEAREST for MAG_FILTER won't use
mipmaps.

Robert.
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