#include <OpenThreads/Mutex>
#include <osg/ref_ptr>
-#include <osg/AlphaFunc>
#include <osg/Array>
-#include <osg/BlendFunc>
-#include <osg/CullFace>
-#include <osg/ShadeModel>
-#include <osg/Texture2D>
-#include <osg/TexEnv>
+
+namespace osg
+{
+class AlphaFunc;
+class BlendFunc;
+class CullFace;
+class Depth;
+class ShadeModel;
+class Texture2D;
+class TexEnv;
+}
+
+#include <simgear/structure/Singleton.hxx>
// Return read-only instances of common OSG state attributes.
namespace simgear
{
-class StateAttributeFactory : public osg::Referenced {
+class StateAttributeFactory :
+ public ReferencedSingleton<StateAttributeFactory> {
public:
// Alpha test > .01
osg::AlphaFunc* getStandardAlphaFunc() { return _standardAlphaFunc.get(); }
osg::Texture2D* getWhiteTexture() { return _whiteTexture.get(); }
// White color
osg::Vec4Array* getWhiteColor() {return _white.get(); }
+ // A white, completely transparent texture
+ osg::Texture2D* getTransparentTexture()
+ {
+ return _transparentTexture.get();
+ }
// cull front and back facing polygons
osg::CullFace* getCullFaceFront() { return _cullFaceFront.get(); }
osg::CullFace* getCullFaceBack() { return _cullFaceBack.get(); }
-
- static StateAttributeFactory* instance();
+ // Standard depth with writes disabled.
+ osg::Depth* getDepthWritesDisabled() { return _depthWritesDisabled.get(); }
+ StateAttributeFactory();
protected:
- StateAttributeFactory();
osg::ref_ptr<osg::AlphaFunc> _standardAlphaFunc;
osg::ref_ptr<osg::ShadeModel> _smooth;
osg::ref_ptr<osg::ShadeModel> _flat;
osg::ref_ptr<osg::BlendFunc> _standardBlendFunc;
osg::ref_ptr<osg::TexEnv> _standardTexEnv;
osg::ref_ptr<osg::Texture2D> _whiteTexture;
+ osg::ref_ptr<osg::Texture2D> _transparentTexture;
osg::ref_ptr<osg::Vec4Array> _white;
osg::ref_ptr<osg::CullFace> _cullFaceFront;
osg::ref_ptr<osg::CullFace> _cullFaceBack;
- static osg::ref_ptr<StateAttributeFactory> _theInstance;
- static OpenThreads::Mutex _instanceMutex;
+ osg::ref_ptr<osg::Depth> _depthWritesDisabled;
};
}
#endif