I have found various resources about setting modes for
light in OSG. But I do not want to use setMode(), but
getMode(), which is giving me some problems.
I want to issue a command like the OpenGL
"glIsEnabled(GL_LIGHT0)" to see if a certain light is
already active. This is needed to find a "free" light
number to enable a new light besides the one already
in the scene. The thing is, the return value from my
getMode() command is always "8"! Any help is greatly
appreciated.
Here is a code fragment:
osg::StateSet* rootStateSet = root->getStateSet();
int lightNum = 0;
osg::StateAttribute::GLModeValue attr =
rootStateSet->getMode(GL_LIGHT0);
if(attr==0) {
lightNum = 0;
} else {
attr = rootStateSet->getMode(GL_LIGHT1);
if(attr==0) {
lightNum = 1;
} else {
attr = rootStateSet->getMode(GL_LIGHT2);
if(attr==0) {
lightNum = 2;
} else {
attr = rootStateSet->getMode(GL_LIGHT3);
if(attr==0) {
lightNum = 3;
}
}
}
}
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