Hi Jeremy, On Wed, Nov 12, 2008 at 4:21 PM, Jeremy Moles <[EMAIL PROTECTED]> wrote: > Well, in OpenGL there are to main formats I envision many of us wanting > to use: > > - ARGB32 (GL_RGBA) > - A8 (GL_ALPHA) > > A8 is really helpful because it allows you to create small, compact > "alpha masks" (maybe I'm using the wrong term here) for texturing. For > example, in osgPango I use CAIRO_FORMAT_A8 to render just the alpha > values for the font glyph, and later a osg::TexEnvCombine() object > (courtesy of Cedric) comes along and sets the actual color. This reduces > the texture memory size by 75%, since the RGB information is fully > irrelevant inside the Cairo texture.
Thanks for the explanation. I can certainly see A8 being useful, as well a straight RGB. Out of curiosity Is the an A16 format? > I don't know if you agree with me here, but once people learn about the > cool 2D stuff they can actually do with Cairo, I imagine many more > people will be interested! I'm very curious where it'll all take us. It's certainly is nice link into a whole set of tools that we don't normally get access to in the pure 3D world. Robert. _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
