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# OgreShadowCaster.h

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    00001 /*
    00002 -----------------------------------------------------------------------------
    00003 This source file is part of OGRE
    00004     (Object-oriented Graphics Rendering Engine)
    00005 For the latest info, see http://www.ogre3d.org/
    00006
    00007 Copyright © 2000-2004 The OGRE Team
    00008 Also see acknowledgements in Readme.html
    00009
    00010 This program is free software; you can redistribute it and/or modify it under
    00011 the terms of the GNU Lesser General Public License as published by the Free Software
    00012 Foundation; either version 2 of the License, or (at your option) any later
    00013 version.
    00014
    00015 This program is distributed in the hope that it will be useful, but WITHOUT
    00016 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    00017 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
    00018
    00019 You should have received a copy of the GNU Lesser General Public License along with
    00020 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
    00021 Place - Suite 330, Boston, MA 02111-1307, USA, or go to
    00022 http://www.gnu.org/copyleft/lesser.txt.
    00023 -----------------------------------------------------------------------------
    00024 */
    00025 #ifndef __ShadowCaster_H__
    00026 #define __ShadowCaster_H__
    00027
    00028 #include "OgrePrerequisites.h"
    00029 #include "OgreRenderable.h"
    00030
    00031
    00032 namespace Ogre {
    00033
    00034
    00043     class _OgreExport ShadowRenderable : public Renderable
    00044     {
    00045     protected:
    00046         Material* mMaterial;
    00047         RenderOperation mRenderOp;
    00048         ShadowRenderable* mLightCap; // used only if isLightCapSeparate == true
    00049     public:
    00050         ShadowRenderable() : mMaterial(0), mLightCap(0) {}
    00051         virtual ~ShadowRenderable() { delete mLightCap; }
    00055         void setMaterial(Material* mat) { mMaterial = mat; }
    00057         Material* getMaterial(void) const { return mMaterial; }
    00059         void getRenderOperation(RenderOperation& op) { op = mRenderOp; }
    00061         RenderOperation* getRenderOperationForUpdate(void) {return &mRenderOp;}
    00063         void getWorldTransforms(Matrix4* xform) const = 0;
    00065         const Quaternion& getWorldOrientation(void) const = 0;
    00067         const Vector3& getWorldPosition(void) const = 0;
    00069         Real getSquaredViewDepth(const Camera* cam) const{ return 0; /* not used */}
    00071         const LightList& getLights(void) const
    00072         {
    00073             // return empty
    00074             static LightList ll;
    00075             return ll;
    00076         }
    00087         bool isLightCapSeparate(void) const { return mLightCap != 0; }
    00088
    00090         ShadowRenderable* getLightCapRenderable(void) { return mLightCap; }
    00092         virtual bool isVisible(void) const { return true; }
    00093
    00094     };
    00095
    00097     enum ShadowRenderableFlags
    00098     {
    00100         SRF_INCLUDE_LIGHT_CAP = 0x00000001,
    00102         SRF_INCLUDE_DARK_CAP  = 0x00000002,
    00104         SRF_EXTRUDE_TO_INFINITY  = 0x00000004
    00105     };
    00106
    00109     class _OgreExport ShadowCaster
    00110     {
    00111     public:
    00113         virtual bool getCastShadows(void) const = 0;
    00114
    00116         virtual EdgeData* getEdgeList(void) = 0;
    00117
    00119         virtual const AxisAlignedBox& getWorldBoundingBox(bool derive = false) const = 0;
    00121         virtual const AxisAlignedBox& getLightCapBounds(void) const = 0;
    00123         virtual const AxisAlignedBox& getDarkCapBounds(const Light& light, Real dirLightExtrusionDist) const = 0;
    00124
    00125         typedef std::vector<ShadowRenderable*> ShadowRenderableList;
    00126         typedef VectorIterator<ShadowRenderableList> ShadowRenderableListIterator;
    00127
    00143         virtual ShadowRenderableListIterator getShadowVolumeRenderableIterator(
    00144             ShadowTechnique shadowTechnique, const Light* light,
    00145             HardwareIndexBufferSharedPtr* indexBuffer,
    00146             bool extrudeVertices, Real extrusionDistance, unsigned long flags = 0 ) = 0;
    00147
    00149         virtual ShadowRenderableListIterator getLastShadowVolumeRenderableIterator (void) = 0;
    00150
    00170         static void extrudeVertices(HardwareVertexBufferSharedPtr vertexBuffer,
    00171             size_t originalVertexCount, const Vector4& lightPos, Real extrudeDist);
    00173         virtual Real getPointExtrusionDistance(const Light* l) const = 0;
    00174     protected:
    00176         Real getExtrusionDistance(const Vector3& objectPos, const Light* light) const;
    00184         virtual void updateEdgeListLightFacing(EdgeData* edgeData,
    00185             const Vector4& lightPos);
    00186
    00200         virtual void generateShadowVolume(EdgeData* edgeData,
    00201             HardwareIndexBufferSharedPtr indexBuffer, const Light* light,
    00202             ShadowRenderableList& shadowRenderables, unsigned long flags);
    00209         virtual void extrudeBounds(AxisAlignedBox& box, const Vector4& lightPos,
    00210             Real extrudeDist) const;
    00211
    00212
    00213     };
    00214 }
    00215
    00216 #endif

Copyright © 2002-2003 by The OGRE Team
Last modified Sun Nov 28 19:48:46 2004