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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 (c) 2000-2006 Torus Knot Software Ltd
    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 You may alternatively use this source under the terms of a specific version of
    00025 the OGRE Unrestricted License provided you have obtained such a license from
    00026 Torus Knot Software Ltd.
    00027 -----------------------------------------------------------------------------
    00028 */
    00029 #ifndef __ShadowCaster_H__
    00030 #define __ShadowCaster_H__
    00031
    00032 #include "OgrePrerequisites.h"
    00033 #include "OgreRenderable.h"
    00034
    00035
    00036 namespace Ogre {
    00037
    00038
    00047     class _OgreExport ShadowRenderable : public Renderable
    00048     {
    00049     protected:
    00050         MaterialPtr mMaterial;
    00051         RenderOperation mRenderOp;
    00052         ShadowRenderable* mLightCap; // used only if isLightCapSeparate == true
    00053     public:
    00054         ShadowRenderable() : mMaterial(), mLightCap(0) {}
    00055         virtual ~ShadowRenderable() { delete mLightCap; }
    00059         void setMaterial(const MaterialPtr& mat) { mMaterial = mat; }
    00061         const MaterialPtr& getMaterial(void) const { return mMaterial; }
    00063         void getRenderOperation(RenderOperation& op) { op = mRenderOp; }
    00065         RenderOperation* getRenderOperationForUpdate(void) {return &mRenderOp;}
    00067         void getWorldTransforms(Matrix4* xform) const = 0;
    00069         const Quaternion& getWorldOrientation(void) const = 0;
    00071         const Vector3& getWorldPosition(void) const = 0;
    00073         Real getSquaredViewDepth(const Camera*) const{ return 0; /* not used */}
    00075         const LightList& getLights(void) const;
    00086         bool isLightCapSeparate(void) const { return mLightCap != 0; }
    00087
    00089         ShadowRenderable* getLightCapRenderable(void) { return mLightCap; }
    00091         virtual bool isVisible(void) const { return true; }
    00092
    00093     };
    00094
    00096     enum ShadowRenderableFlags
    00097     {
    00099         SRF_INCLUDE_LIGHT_CAP = 0x00000001,
    00101         SRF_INCLUDE_DARK_CAP  = 0x00000002,
    00103         SRF_EXTRUDE_TO_INFINITY  = 0x00000004
    00104     };
    00105
    00108     class _OgreExport ShadowCaster
    00109     {
    00110     public:
    00111         virtual ~ShadowCaster() { }
    00113         virtual bool getCastShadows(void) const = 0;
    00114
    00116         virtual EdgeData* getEdgeList(void) = 0;
    00118         virtual bool hasEdgeList(void) = 0;
    00119
    00121         virtual const AxisAlignedBox& getWorldBoundingBox(bool derive = false) const = 0;
    00123         virtual const AxisAlignedBox& getLightCapBounds(void) const = 0;
    00125         virtual const AxisAlignedBox& getDarkCapBounds(const Light& light, Real dirLightExtrusionDist) const = 0;
    00126
    00127         typedef std::vector<ShadowRenderable*> ShadowRenderableList;
    00128         typedef VectorIterator<ShadowRenderableList> ShadowRenderableListIterator;
    00129
    00145         virtual ShadowRenderableListIterator getShadowVolumeRenderableIterator(
    00146             ShadowTechnique shadowTechnique, const Light* light,
    00147             HardwareIndexBufferSharedPtr* indexBuffer,
    00148             bool extrudeVertices, Real extrusionDistance, unsigned long flags = 0 ) = 0;
    00149
    00169         static void extrudeVertices(const HardwareVertexBufferSharedPtr& vertexBuffer,
    00170             size_t originalVertexCount, const Vector4& lightPos, Real extrudeDist);
    00172         virtual Real getPointExtrusionDistance(const Light* l) const = 0;
    00173     protected:
    00175         Real getExtrusionDistance(const Vector3& objectPos, const Light* light) const;
    00183         virtual void updateEdgeListLightFacing(EdgeData* edgeData,
    00184             const Vector4& lightPos);
    00185
    00199         virtual void generateShadowVolume(EdgeData* edgeData,
    00200             const HardwareIndexBufferSharedPtr& indexBuffer, const Light* light,
    00201             ShadowRenderableList& shadowRenderables, unsigned long flags);
    00208         virtual void extrudeBounds(AxisAlignedBox& box, const Vector4& lightPos,
    00209             Real extrudeDist) const;
    00210
    00211
    00212     };
    00213 }
    00214
    00215 #endif

Copyright © 2000-2005 by The OGRE Team
This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Sun Sep 30 10:50:57 2007