103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
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#include <osg/Referenced>
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#include <osg/Node>
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#include <osg/Camera>
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#include <osg/TextureRectangle>
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#include <osg/Texture2D>
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#include <osgGA/GUIEventHandler>
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#include <limits>
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#ifndef DEPTHPEELING_H
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#define DEPTHPEELING_H
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// Some choices for the kind of textures we can use ...
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#define USE_TEXTURE_RECTANGLE
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//#define USE_NON_POWER_OF_TWO_TEXTURE
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#define USE_PACKED_DEPTH_STENCIL
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template<typename T>
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inline T
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nextPowerOfTwo(T k)
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{
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if (k == T(0))
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return 1;
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k--;
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for (int i = 1; i < std::numeric_limits<T>::digits; i <<= 1)
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k = k | k >> i;
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return k + 1;
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}
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class DepthPeeling : public osg::Referenced {
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public:
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DepthPeeling(unsigned int width, unsigned int height);
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void setSolidScene(osg::Node* scene);
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void setTransparentScene(osg::Node* scene);
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osg::Node* getRoot();
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void resize(int width, int height);
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void setNumPasses(unsigned int numPasses);
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unsigned int getNumPasses() const;
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void setTexUnit(unsigned int texUnit);
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void setShowAllLayers(bool showAllLayers);
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bool getShowAllLayers() const;
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void setOffsetValue(unsigned int offsetValue);
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unsigned int getOffsetValue() const;
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static const char *PeelingShader; /* use this to support depth peeling in GLSL shaders in transparent objects */
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class EventHandler : public osgGA::GUIEventHandler {
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public:
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EventHandler(DepthPeeling* depthPeeling);
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/** Handle events, return true if handled, false otherwise. */
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virtual bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter&, osg::Object*, osg::NodeVisitor*);
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protected:
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osg::ref_ptr<DepthPeeling> _depthPeeling;
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};
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protected:
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osg::Node *createQuad(unsigned int layerNumber, unsigned int numTiles);
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void createPeeling();
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class CullCallback : public osg::NodeCallback {
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public:
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CullCallback(unsigned int texUnit, unsigned int texWidth, unsigned int texHeight, unsigned int offsetValue);
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virtual void operator()(osg::Node* node, osg::NodeVisitor* nv);
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private:
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unsigned int _texUnit;
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unsigned int _texWidth;
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unsigned int _texHeight;
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unsigned int _offsetValue;
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};
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unsigned int _numPasses;
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unsigned int _texUnit;
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unsigned int _texWidth;
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unsigned int _texHeight;
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bool _showAllLayers;
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unsigned int _offsetValue;
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// The root node that is handed over to the viewer
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osg::ref_ptr<osg::Group> _root;
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// The scene that is displayed
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osg::ref_ptr<osg::Group> _solidscene;
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osg::ref_ptr<osg::Group> _transparentscene;
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// The final camera that composites the pre rendered textures to the final picture
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osg::ref_ptr<osg::Camera> _compositeCamera;
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#ifdef USE_TEXTURE_RECTANGLE
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std::vector<osg::ref_ptr<osg::TextureRectangle> > _depthTextures;
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std::vector<osg::ref_ptr<osg::TextureRectangle> > _colorTextures;
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#else
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std::vector<osg::ref_ptr<osg::Texture2D> > _depthTextures;
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std::vector<osg::ref_ptr<osg::Texture2D> > _colorTextures;
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#endif
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};
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#endif // #ifndef DEPTHPEELING_H
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