228 lines
8.4 KiB
C++
228 lines
8.4 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2003 Robert Osfield
|
|
*
|
|
* This library is open source and may be redistributed and/or modified under
|
|
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
|
|
* (at your option) any later version. The full license is in LICENSE file
|
|
* included with this distribution, and on the openscenegraph.org website.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* OpenSceneGraph Public License for more details.
|
|
*/
|
|
|
|
#ifndef OSG_ImpostorSprite
|
|
#define OSG_ImpostorSprite 1
|
|
|
|
#include <osg/Vec2>
|
|
#include <osg/BoundingSphere>
|
|
#include <osg/Drawable>
|
|
#include <osg/ImpostorSprite>
|
|
#include <osg/AlphaFunc>
|
|
#include <osg/TexEnv>
|
|
|
|
namespace osg {
|
|
|
|
class Texture2D;
|
|
class Impostor;
|
|
class ImpostorSpriteManager;
|
|
|
|
/** An ImposterSprite is a textured quad which is rendered in place of
|
|
* 3D geometry. The ImposterSprite is generated by rendering the original
|
|
* 3D geometry to a texture as an image cache. The ImpostorSprite is
|
|
* automatically generated by the osgUtil::CullVisitor so it not
|
|
* necessary to deal with it directly.
|
|
*/
|
|
class SG_EXPORT ImpostorSprite : public Drawable
|
|
{
|
|
public:
|
|
|
|
ImpostorSprite();
|
|
|
|
/** Clone an object of the same type as an ImpostorSprite. */
|
|
virtual Object* cloneType() const { return new ImpostorSprite(); }
|
|
|
|
/** Clone on ImpostorSprite just returns a clone of type,
|
|
* since it is not appropriate to share data of an ImpostorSprite.
|
|
*/
|
|
virtual Object* clone(const CopyOp&) const { return new ImpostorSprite(); }
|
|
virtual bool isSameKindAs(const Object* obj) const { return dynamic_cast<const ImpostorSprite*>(obj)!=NULL; }
|
|
virtual const char* libraryName() const { return "osg"; }
|
|
virtual const char* className() const { return "ImpostorSprite"; }
|
|
|
|
/** Set the parent, which must be an Impostor.
|
|
* Unlike conventional Drawables, ImpostorSprites can only ever have
|
|
* one parent.
|
|
*/
|
|
void setParent(Impostor* parent) { _parent = parent; }
|
|
|
|
/** Get the parent, which is an Impostor. */
|
|
Impostor* getParent() { return _parent; }
|
|
|
|
/** Get the const parent, which is an Impostor. */
|
|
const Impostor* getParent() const { return _parent; }
|
|
|
|
/** Set the eye point for when the ImpostorSprite was snapped. */
|
|
inline void setStoredLocalEyePoint(const Vec3& v) { _storedLocalEyePoint=v; }
|
|
|
|
/** Get the eye point for when the ImpostorSprite was snapped. */
|
|
inline const Vec3& getStoredLocalEyePoint() const { return _storedLocalEyePoint; }
|
|
|
|
/** Set the frame number for when the ImpostorSprite was last used in rendering. */
|
|
inline void setLastFrameUsed(int frameNumber) { _lastFrameUsed = frameNumber; }
|
|
|
|
/** Get the frame number for when the ImpostorSprite was last used in rendering. */
|
|
inline int getLastFrameUsed() const { return _lastFrameUsed; }
|
|
|
|
|
|
/** Get the coordinates of the corners of the quad.
|
|
* Stored in the order, [0] - top_left, [1] - bottom_left, [2] - bottom_right, [3] - top_left.
|
|
*/
|
|
inline Vec3* getCoords() { return _coords; }
|
|
|
|
/** Get the const coordinates of the corners of the quad. */
|
|
inline const Vec3* getCoords() const { return _coords; }
|
|
|
|
|
|
|
|
/** Get the texture coordinates of the corners of the quad.
|
|
* Stored in the order, [0] - top_left, [1] - bottom_left, [2] - bottom_right, [3] - top_left.
|
|
*/
|
|
inline Vec2* getTexCoords() { return _texcoords; }
|
|
|
|
/** Get the const texture coordinates of the corners of the quad. */
|
|
inline const Vec2* getTexCoords() const { return _texcoords; }
|
|
|
|
/** Get the control coordinates of the corners of the quad.
|
|
* The control coordinates are the corners of the quad projected
|
|
* out onto the front face of bounding box which enclosed the impostor
|
|
* geometry when it was pre-rendered into the impostor sprite's texture.
|
|
* At the point of creation/or update of the impostor sprite the control
|
|
* coords will lie on top of the corners of the quad in screen space - with a pixel error
|
|
* of zero. Once the camera moves relative to the impostor sprite the
|
|
* control coords will no longer lie on top of the corners of the quad in
|
|
* screen space - a pixel error will have accumulated. This pixel error
|
|
* can then be used to determine whether the impostor needs to be updated.
|
|
* Stored in the order, [0] - top_left, [1] - bottom_left, [2] - bottom_right, [3] - top_left.
|
|
*/
|
|
inline Vec3* getControlCoords() { return _controlcoords; }
|
|
|
|
/** Get the const control coordinates of the corners of the quad. */
|
|
inline const Vec3* getControlCoords() const { return _controlcoords; }
|
|
|
|
|
|
/** Calculate the pixel error value for passing in the ModelViewProjectionWindow transform,
|
|
* which transform local coords into screen space.
|
|
*/
|
|
float calcPixelError(const Matrix& MVPW) const;
|
|
|
|
void setTexture(Texture2D* tex,int s,int t);
|
|
Texture2D* getTexture() { return _texture; }
|
|
const Texture2D* getTexture() const { return _texture; }
|
|
|
|
int s() const { return _s; }
|
|
int t() const { return _t; }
|
|
|
|
/** Draw ImpostorSprite directly. */
|
|
virtual void drawImplementation(State& state) const;
|
|
|
|
/** Return true, osg::ImpostorSprite does support accept(AttributeFunctor&). */
|
|
virtual bool supports(const AttributeFunctor&) const { return true; }
|
|
|
|
/** Accept an AttributeFunctor and call its methods to tell it about the interal attributes that this Drawable has. */
|
|
virtual void accept(AttributeFunctor& af);
|
|
|
|
/** Return true, osg::ImpostorSprite does support accept(ConstAttributeFunctor&). */
|
|
virtual bool supports(const ConstAttributeFunctor&) const { return true; }
|
|
|
|
/** Accept a ConstAttributeFunctor and call its methods to tell it about the interal attributes that this Drawable has. */
|
|
virtual void accept(ConstAttributeFunctor& af) const;
|
|
|
|
/** Return true, osg::ImpostorSprite does support accept(PrimitiveFunctor&). */
|
|
virtual bool supports(const PrimitiveFunctor&) const { return true; }
|
|
|
|
/** Accept a PrimtiveFunctor and call its methods to tell it about the interal primtives that this Drawable has. */
|
|
virtual void accept(PrimitiveFunctor& pf) const;
|
|
|
|
// for debugging purposes.
|
|
Vec4 _color;
|
|
|
|
protected:
|
|
|
|
ImpostorSprite(const ImpostorSprite&):Drawable() {}
|
|
ImpostorSprite& operator = (const ImpostorSprite&) { return *this;}
|
|
|
|
virtual ~ImpostorSprite();
|
|
|
|
virtual bool computeBound() const;
|
|
|
|
Impostor* _parent;
|
|
|
|
friend class osg::ImpostorSpriteManager;
|
|
|
|
// support for a double linked list managed by the
|
|
// ImposotorSpriteManager.
|
|
ImpostorSpriteManager* _ism;
|
|
ImpostorSprite* _previous;
|
|
ImpostorSprite* _next;
|
|
|
|
int _lastFrameUsed;
|
|
|
|
Vec3 _storedLocalEyePoint;
|
|
|
|
Vec3 _coords[4];
|
|
Vec2 _texcoords[4];
|
|
Vec3 _controlcoords[4];
|
|
|
|
Texture2D* _texture;
|
|
int _s;
|
|
int _t;
|
|
|
|
|
|
};
|
|
|
|
/** Helper class for managing the reuse of ImpostorSprite resources. */
|
|
class SG_EXPORT ImpostorSpriteManager : public Referenced
|
|
{
|
|
public:
|
|
|
|
ImpostorSpriteManager();
|
|
|
|
bool empty() const { return _first==0; }
|
|
|
|
ImpostorSprite* first() { return _first; }
|
|
|
|
ImpostorSprite* last() { return _last; }
|
|
|
|
void push_back(ImpostorSprite* is);
|
|
|
|
void remove(ImpostorSprite* is);
|
|
|
|
ImpostorSprite* createOrReuseImpostorSprite(int s,int t,int frameNumber);
|
|
|
|
StateSet* createOrReuseStateSet();
|
|
|
|
void reset();
|
|
|
|
protected:
|
|
|
|
|
|
~ImpostorSpriteManager();
|
|
|
|
ref_ptr<TexEnv> _texenv;
|
|
ref_ptr<AlphaFunc> _alphafunc;
|
|
|
|
ImpostorSprite* _first;
|
|
ImpostorSprite* _last;
|
|
|
|
typedef std::vector< ref_ptr<StateSet> > StateSetList;
|
|
StateSetList _stateSetList;
|
|
unsigned int _reuseStateSetIndex;
|
|
|
|
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|