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Added callbacks to allow users to modify the underlying functionality of

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LOD, Billboard and Drawabel objects.
This commit is contained in:
Robert Osfield
2002-02-07 01:07:11 +00:00
parent a4ea331f3a
commit b00d103f4e
6 changed files with 134 additions and 88 deletions
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38
include/osg/Billboard
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@@ -77,8 +77,35 @@ class SG_EXPORT Billboard : public Geode
* and do not the reference count of gset is left unchanged.
*/
virtual const bool removeDrawable( Drawable *gset );
void calcTransform(const Vec3& eye_local, const Vec3& up_local, const Vec3& pos_local,Matrix& mat) const;
/** Callback attached to an Billboard which allows the users to customize the billboard orientation calculation during cull traversal.*/
struct ComputeBillboardCallback : public osg::Referenced
{
/** Get the transformation matrix which moves from local coords to world coords.*/
virtual void computeMatrix(const Matrix& matrix, const Billboard* billboard, const Vec3& eye_local, const Vec3& up_local, const Vec3& pos_local) const;
};
friend struct osg::Billboard::ComputeBillboardCallback;
/** Set the ComputeBillboardCallback which allows users to attach custom computation of the local transformation as
* seen by cull traversers and alike.*/
void setComputeBillboardCallback(ComputeBillboardCallback* ctc) { _computeBillboardCallback=ctc; }
/** Get the non const ComputeBillboardCallback.*/
ComputeBillboardCallback* getComputeBillboardCallback() { return _computeBillboardCallback.get(); }
/** Get the const ComputeBillboardCallback.*/
const ComputeBillboardCallback* getComputeBillboardCallback() const { return _computeBillboardCallback.get(); }
inline void getMatrix(Matrix& matrix, const Vec3& eye_local, const Vec3& up_local, const Vec3& pos_local) const
{
if (_computeBillboardCallback.valid())
return _computeBillboardCallback->computeMatrix(matrix,this,eye_local,up_local,pos_local);
else
return computeMatrix(matrix,eye_local,up_local,pos_local);
}
protected:
@@ -86,6 +113,8 @@ class SG_EXPORT Billboard : public Geode
virtual const bool computeBound() const;
virtual void computeMatrix(Matrix& matrix, const Vec3& eye_local, const Vec3& up_local, const Vec3& pos_local) const;
enum AxisAligned
{
AXIAL_ROT_X_AXIS=AXIAL_ROT+1,
@@ -94,9 +123,10 @@ class SG_EXPORT Billboard : public Geode
};
Mode _mode;
Vec3 _axis;
PositionList _positionList;
Mode _mode;
Vec3 _axis;
PositionList _positionList;
ref_ptr<ComputeBillboardCallback> _computeBillboardCallback;
// used internally as cache of which what _axis is aligned to help
// deicde which method of rotation to use.

54
include/osg/Drawable
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@@ -56,14 +56,7 @@ class SG_EXPORT Drawable : public Object
Drawable();
/** Copy constructor using CopyOp to manage deep vs shallow copy.*/
Drawable(const Drawable& drawable,const CopyOp& copyop=CopyOp::SHALLOW_COPY):
Object(drawable,copyop),
_dstate(copyop(drawable._dstate.get())),
_supportsDisplayList(drawable._supportsDisplayList),
_useDisplayList(drawable._useDisplayList),
_globjList(drawable._globjList),
_bbox(drawable._bbox),
_bbox_computed(drawable._bbox_computed) {}
Drawable(const Drawable& drawable,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
virtual bool isSameKindAs(const Object* obj) const { return dynamic_cast<const Drawable*>(obj)!=NULL; }
virtual const char* className() const { return "Drawable"; }
@@ -135,12 +128,38 @@ class SG_EXPORT Drawable : public Object
Note II, compile is not intended to be overridden in subclasses.*/
void compile(State& state);
/** Callback attached to an Drawable which allows the users to customize the drawing of an exist Drawable object.
* The draw callback is implement as a replacement to the Drawable's own drawImmediateMode() method, if the
* the user intends to decorate the exist draw code then simple call the drawable->drawImmediateMode() from
* with the callbacks drawImmediateMode() method. This allows the users to do both pre and post callbacks
* without fuss and can even diable the inner draw in required.*/
struct DrawCallback : public osg::Referenced
{
/** do customized draw code.*/
virtual void drawImmediateMode(State& state,osg::Drawable* drawable) const;
};
friend struct osg::Drawable::DrawCallback;
/** Set the DrawCallback which allows users to attach customize the drawing of existing Drawable object.*/
void setDrawCallback(DrawCallback* dc) { _drawCallback=dc; dirtyBound(); }
/** Get the non const ComputerTransfromCallback.*/
DrawCallback* getDrawCallback() { return _drawCallback.get(); }
/** Get the const ComputerTransfromCallback.*/
const DrawCallback* getDrawCallback() const { return _drawCallback.get(); }
/** draw directly ignoring an OpenGL display list which could be attached.
* This is the internal draw method which does the drawing itself,
* and is the method to override when deriving from Drawable.
*/
virtual void drawImmediateMode(State& state) = 0;
/** use deleteDisplayList instead of glDeleteList to allow
* OpenGL display list to cached until they can be deleted
* by the OpenGL context in which they were created, specified
@@ -196,6 +215,8 @@ class SG_EXPORT Drawable : public Object
virtual AttributeBitMask applyAttributeOperation(AttributeFunctor&) { return 0; }
protected:
Drawable& operator = (const Drawable&) { return *this;}
@@ -217,6 +238,8 @@ class SG_EXPORT Drawable : public Object
mutable BoundingBox _bbox;
mutable bool _bbox_computed;
ref_ptr<DrawCallback> _drawCallback;
// static cache of deleted display lists which can only
// by completely deleted once the appropriate OpenGL context
// is set.
@@ -250,14 +273,20 @@ inline void Drawable::draw(State& state)
#ifdef USE_SEPERATE_COMPILE_AND_EXECUTE
globj = glGenLists( 1 );
glNewList( globj, GL_COMPILE );
drawImmediateMode(state);
if (_drawCallback.valid())
_drawCallback->drawImmediateMode(state,this);
else
drawImmediateMode(state);
glEndList();
glCallList( globj);
#else
globj = glGenLists( 1 );
glNewList( globj, GL_COMPILE_AND_EXECUTE );
drawImmediateMode(state);
if (_drawCallback.valid())
_drawCallback->drawImmediateMode(state,this);
else
drawImmediateMode(state);
glEndList();
#endif
}
@@ -266,7 +295,10 @@ inline void Drawable::draw(State& state)
else
{
// draw object as nature intended..
drawImmediateMode(state);
if (_drawCallback.valid())
_drawCallback->drawImmediateMode(state,this);
else
drawImmediateMode(state);
}
}

33
include/osg/LOD
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@@ -56,21 +56,52 @@ class SG_EXPORT LOD : public Group
inline const Vec3& getCenter() const { return _center; }
/** Callback attached to an LOD which allows the users to customize the selection of LOD children.*/
struct EvaluateLODCallback : public osg::Referenced
{
/** Compute the child to select.*/
virtual const int evaluateLODChild(const osg::LOD* lod, const Vec3& eye_local, const float bias) const;
};
friend struct osg::LOD::EvaluateLODCallback;
/** Set the EvaluateLODCallback which allows users to attach customize computation of the the selection of LOD children.*/
void setEvaluateLODCallback(EvaluateLODCallback* cbc) { _evaluateLODCallback=cbc; }
/** Get the non const ComputeBillboardCallback.*/
EvaluateLODCallback* getEvaluateLODCallback() { return _evaluateLODCallback.get(); }
/** Get the const ComputeBillboardCallback.*/
const EvaluateLODCallback* getEvaluateLODCallback() const { return _evaluateLODCallback.get(); }
/** return the child to traverse.
Selected by the distance between the eye point in local
coordinates and the LOD center, multiplied by the bias.*/
const int evaluate(const Vec3& eye_local,const float bias=1.0f) const;
inline const int evaluate(const Vec3& eye_local,const float bias=1.0f) const
{
if (_evaluateLODCallback.valid())
return _evaluateLODCallback->evaluateLODChild(this,eye_local,bias);
else
return evaluateLODChild(eye_local,bias);
}
protected :
virtual ~LOD() {}
virtual const int evaluateLODChild(const Vec3& eye_local,const float bias) const;
typedef std::vector<float> RangeList;
RangeList _rangeList;
RangeList _rangeList2;
ref_ptr<EvaluateLODCallback> _evaluateLODCallback;
Vec3 _center;
};
}