Hey everyone,
I'm writing a fragment shader to do projective texturing. I'm using an
osg::camera to render a depth map to a texture, and then I'd like to bind that
texture to my model so that I can access it from within my fragment shader.
I looked at the osgmultitexture example, and the texture code is as follows:
osg::Texture2D* texture = new osg::Texture2D;
texture->setImage(image);
osg::TexGen* texgen = new osg::TexGen;
texgen->setMode(osg::TexGen::SPHERE_MAP);
osg::TexEnv* texenv = new osg::TexEnv;
texenv->setMode(osg::TexEnv::BLEND);
texenv->setColor(osg::Vec4(0.3f,0.3f,0.3f,0.3f));
osg::StateSet* stateset = new osg::StateSet;
stateset->setTextureAttributeAndModes(1,texture,osg::StateAttribute::ON);
stateset->setTextureAttributeAndModes(1,texgen,osg::StateAttribute::ON);
stateset->setTextureAttribute(1,texenv);
rootnode->setStateSet(stateset);
>From my understanding, the line:
stateset->setTextureAttributeAndModes(1,texture,osg::StateAttribute::ON);
binds "texture" to texture unit 1 and enables that texture. But then looking
at the two lines together:
stateset->setTextureAttributeAndModes(1,texture,osg::StateAttribute::ON);
stateset->setTextureAttributeAndModes(1,texgen,osg::StateAttribute::ON);
it would appear that both of these textures are being applied to texture unit
1, and are then being blended together by the osg::TexEnv that is defined (and
also applied to texture unit 1).
My initial thought was that I would just take my model's stateset (the model is
only using a single texture) and make a function call like:
osg::StateSet* stateset = model->getOrCreateStateSet();
stateset->setTextureAttributeAndModes(2,my_texture,osg::StateAttribute::ON);
to bind a texture into texture unit 2 for that model. I tried this and it
doesn't seem to allow me to access the second texture in my fragment shader. I
attempted to put the new texture in texture unit 1 (attempting to copy the
example where both textures are put in the first texture unit) but I didn't use
an osg::TexEnv to blend or anything like that (I just want to be able to access
both textures independently, I don't want them to be blended for me).
I realize this is a pretty elementary question, but it's had me stumped for
longer than I care to admit :). Thanks a bunch in advance for any help you
guys can offer!
Mark
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