932608f804
"I have adapted to osgShadow the soft shadow map technique described in "Efficient Soft-Edged Shadows Using Pixel Shader Branching" by Yury Uralsky, Chapter 17 of GPU Gems 2 (Matt Pharr ed. Addison-Wesley). Here is my code in attachment: basically, it works in the same way as osgShadow/ShadowMap (core code is copied from it) but implements a specific GLSL shader for the soft rendering of penumbra. I have tested it under Linux with a NVidia graphic card, but there should be no dependency on platform nor on the graphics driver (as far as they support GLSL 2). Screenshots attached show the current results (frame rate bound to v-sync, but the shader takes actually not much time)."
95 lines
3.6 KiB
C++
95 lines
3.6 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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#ifndef OSGSHADOW_SOFTSHADOWMAP
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#define OSGSHADOW_SOFTSHADOWMAP 1
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#include <osg/Camera>
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#include <osg/Material>
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#include <osgShadow/ShadowTechnique>
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namespace osgShadow {
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/** SoftShadowMap provides an implementation of soft shadows with shadow maps.*/
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class OSGSHADOW_EXPORT SoftShadowMap : public ShadowTechnique
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{
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public :
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SoftShadowMap();
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SoftShadowMap(const SoftShadowMap& es, const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);
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META_Object(osgShadow, SoftShadowMap);
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/** Set the texture unit that the shadow texture will be applied on.*/
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void setTextureUnit(unsigned int unit);
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/** Get the texture unit that the shadow texture will be applied on.*/
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unsigned int getTextureUnit() const { return _textureUnit; }
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/** Set the values for the ambient bias the shader will use.*/
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void setAmbientBias(const osg::Vec2& ambientBias );
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/** Set the values for width of the soft penumbra the shader will use.
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* Zero is for hard shadow (no penumbra). 0.01 is already very soft penumbra.
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* Default is 0.005.*/
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void setSoftnessWidth(const float softnesswidth );
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/** Set the values for jittering scale the shader will use.
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* Zero is no jittering (i.e. see the banding in penumbra)
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* High values (>64) cause 'pixelization' of the penumbra.
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* Usually but not necessarily power of two number.
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* Default is 32. */
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void setJitteringScale(const float jitteringscale );
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/** Get the values that are used for the ambient bias in the shader.*/
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const osg::Vec2& getAmbientBias() const { return _ambientBias; }
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/** Get the value used for width of the soft penumbra in the shader.*/
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const float getSoftnessWidth() const { return _softnesswidth; }
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/** Get the value used for jittering scale in the shader.*/
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const float getJitteringScale() const { return _jitteringscale; }
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/** initialize the ShadowedScene and local cached data structures.*/
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virtual void init();
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/** run the update traversal of the ShadowedScene and update any loca chached data structures.*/
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virtual void update(osg::NodeVisitor& nv);
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/** run the cull traversal of the ShadowedScene and set up the rendering for this ShadowTechnique.*/
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virtual void cull(osgUtil::CullVisitor& cv);
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/** Clean scene graph from any shadow technique specific nodes, state and drawables.*/
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virtual void cleanSceneGraph();
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protected :
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virtual ~SoftShadowMap() {}
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void initJittering(osg::StateSet *);
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osg::ref_ptr<osg::Camera> _camera;
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osg::ref_ptr<osg::TexGen> _texgen;
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osg::ref_ptr<osg::Texture2D> _texture;
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osg::ref_ptr<osg::StateSet> _stateset;
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unsigned int _textureUnit;
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osg::Vec2 _ambientBias;
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float _softnesswidth;
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float _jitteringscale;
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};
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}
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#endif
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