FGFS-4.1/OpenSceneGraph
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Added osg::Drawable::PrimitiveFunctor and TriangleFunctor subclass for

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querrying the primitive data inside Drawables.  Moved various support
classes over from being osg::GeoSet based to osg::Geometry based.
This commit is contained in:
Robert Osfield
2002-06-25 20:27:51 +00:00
parent 336c47e5fe
commit cbeeeefdab
20 changed files with 737 additions and 651 deletions
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348
include/osg/Drawable
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@@ -33,7 +33,7 @@ class Node;
#define USE_SEPERATE_COMPILE_AND_EXECUTE
/** Pure virtual base class for drawable Geometry. Contains no drawing primitives
directly, these are provided by subclasses such as GeoSet. State attributes
directly, these are provided by subclasses such as osg::Geometry. State attributes
for a Drawable are maintained in StateSet which the Drawable maintains
a referenced counted pointer to. Both Drawable's and StateSet's can
be shared for optimal memory usage and graphics performance.
@@ -41,7 +41,7 @@ class Node;
Subclasses should provide an instance of getStats(Statistics *st) if the subclass
contains drawing primitives. This member function should add the primitives it
draws into the Statistics class; for example add the number of quads, triangles etc
created. For an example see GeoSet.cpp:
created. For an example see Geometry.cpp:
getStats(osgUtil::Statistics *stat).
Failure to implement this routine will only result in the stats displayed for
your drawable being wrong.
@@ -261,6 +261,26 @@ class SG_EXPORT Drawable : public Object
virtual AttributeBitMask applyAttributeOperation(AttributeFunctor&) { return 0; }
class PrimitiveFunctor
{
public:
virtual void setVertexArray(unsigned int count,Vec3* vertices) = 0;
virtual void drawArrays(GLenum mode,GLint first,GLsizei count) = 0;
virtual void drawElements(GLenum mode,GLsizei count,unsigned char* indices) = 0;
virtual void drawElements(GLenum mode,GLsizei count,unsigned short* indices) = 0;
virtual void drawElements(GLenum mode,GLsizei count,unsigned int* indices) = 0;
virtual void begin(GLenum mode) = 0;
virtual void vertex(const Vec3& vert) = 0;
virtual void vertex(float x,float y,float z) = 0;
virtual void end() = 0;
};
/** apply the internal geometry as basic primitives to a PrimitiveFunctor.*/
virtual void applyPrimitiveOperation(PrimitiveFunctor&) {}
protected:
@@ -354,7 +374,329 @@ inline void Drawable::draw(State& state)
else
drawImmediateMode(state);
}
}
};
template<class T>
class TriangleFunctor : public Drawable::PrimitiveFunctor, public T
{
public:
TriangleFunctor()
{
_vertexArraySize=0;
_vertexArrayPtr=0;
_modeCache=0;
}
virtual ~TriangleFunctor() {}
virtual void setVertexArray(unsigned int count,Vec3* vertices)
{
_vertexArraySize = count;
_vertexArrayPtr = vertices;
}
virtual void drawArrays(GLenum mode,GLint first,GLsizei count)
{
if (_vertexArrayPtr==0 && count==0) return;
switch(mode)
{
case(GL_TRIANGLES):
{
Vec3* vlast = &_vertexArrayPtr[first+count];
for(Vec3* vptr=&_vertexArrayPtr[first];vptr<vlast;vptr+=3)
operator()(*(vptr),*(vptr+1),*(vptr+2));
break;
}
case(GL_TRIANGLE_STRIP):
{
Vec3* vptr = &_vertexArrayPtr[first];
for(GLsizei i=2;i<count;++i,++vptr)
{
if ((i%2)) operator()(*(vptr),*(vptr+2),*(vptr+1));
else operator()(*(vptr),*(vptr+1),*(vptr+2));
}
break;
}
case(GL_QUADS):
{
Vec3* vptr = &_vertexArrayPtr[first];
for(GLsizei i=3;i<count;i+=4,vptr+=4)
{
operator()(*(vptr),*(vptr+1),*(vptr+2));
operator()(*(vptr),*(vptr+2),*(vptr+3));
}
break;
}
case(GL_QUAD_STRIP):
{
Vec3* vptr = &_vertexArrayPtr[first];
for(GLsizei i=3;i<count;i+=2,vptr+=2)
{
operator()(*(vptr),*(vptr+1),*(vptr+2));
operator()(*(vptr),*(vptr+2),*(vptr+3));
}
break;
}
case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
case(GL_TRIANGLE_FAN):
{
Vec3* vfirst = &_vertexArrayPtr[first];
Vec3* vptr = vfirst+1;
for(GLsizei i=2;i<count;++i,++vptr)
{
operator()(*(vfirst),*(vptr),*(vptr+1));
}
break;
}
case(GL_POINTS):
case(GL_LINES):
case(GL_LINE_STRIP):
case(GL_LINE_LOOP):
default:
// can't be converted into to triangles.
break;
}
}
virtual void drawElements(GLenum mode,GLsizei count,unsigned char* indices)
{
if (indices==0 || count==0) return;
typedef unsigned char* IndexPointer;
switch(mode)
{
case(GL_TRIANGLES):
{
IndexPointer ilast = &indices[count];
for(IndexPointer iptr=indices;iptr<ilast;iptr+=3)
operator()(_vertexArrayPtr[*iptr],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
break;
}
case(GL_TRIANGLE_STRIP):
{
IndexPointer iptr = indices;
for(GLsizei i=2;i<count;++i,++iptr)
{
if ((i%2)) operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+1)]);
else operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
}
break;
}
case(GL_QUADS):
{
IndexPointer iptr = indices;
for(GLsizei i=3;i<count;i+=4,iptr+=4)
{
operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+3)]);
}
break;
}
case(GL_QUAD_STRIP):
{
IndexPointer iptr = indices;
for(GLsizei i=3;i<count;i+=2,iptr+=2)
{
operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+3)]);
}
break;
}
case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
case(GL_TRIANGLE_FAN):
{
IndexPointer iptr = indices;
Vec3& vfirst = _vertexArrayPtr[*iptr];
++iptr;
for(GLsizei i=2;i<count;++i,++iptr)
{
operator()(vfirst,_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)]);
}
break;
}
case(GL_POINTS):
case(GL_LINES):
case(GL_LINE_STRIP):
case(GL_LINE_LOOP):
default:
// can't be converted into to triangles.
break;
}
}
virtual void drawElements(GLenum mode,GLsizei count,unsigned short* indices)
{
if (indices==0 || count==0) return;
typedef unsigned short* IndexPointer;
switch(mode)
{
case(GL_TRIANGLES):
{
IndexPointer ilast = &indices[count];
for(IndexPointer iptr=indices;iptr<ilast;iptr+=3)
{
operator()(_vertexArrayPtr[*iptr],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
}
break;
}
case(GL_TRIANGLE_STRIP):
{
IndexPointer iptr = indices;
for(GLsizei i=2;i<count;++i,++iptr)
{
if ((i%2)) operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+1)]);
else operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
}
break;
}
case(GL_QUADS):
{
IndexPointer iptr = indices;
for(GLsizei i=3;i<count;i+=4,iptr+=4)
{
operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+3)]);
}
break;
}
case(GL_QUAD_STRIP):
{
IndexPointer iptr = indices;
for(GLsizei i=3;i<count;i+=2,iptr+=2)
{
operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+3)]);
}
break;
}
case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
case(GL_TRIANGLE_FAN):
{
IndexPointer iptr = indices;
Vec3& vfirst = _vertexArrayPtr[*iptr];
++iptr;
for(GLsizei i=2;i<count;++i,++iptr)
{
operator()(vfirst,_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)]);
}
break;
}
case(GL_POINTS):
case(GL_LINES):
case(GL_LINE_STRIP):
case(GL_LINE_LOOP):
default:
// can't be converted into to triangles.
break;
}
}
virtual void drawElements(GLenum mode,GLsizei count,unsigned int* indices)
{
if (indices==0 || count==0) return;
typedef unsigned int* IndexPointer;
switch(mode)
{
case(GL_TRIANGLES):
{
IndexPointer ilast = &indices[count];
for(IndexPointer iptr=indices;iptr<ilast;iptr+=3)
operator()(_vertexArrayPtr[*iptr],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
break;
}
case(GL_TRIANGLE_STRIP):
{
IndexPointer iptr = indices;
for(GLsizei i=2;i<count;++i,++iptr)
{
if ((i%2)) operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+1)]);
else operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
}
break;
}
case(GL_QUADS):
{
IndexPointer iptr = indices;
for(GLsizei i=3;i<count;i+=4,iptr+=4)
{
operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+3)]);
}
break;
}
case(GL_QUAD_STRIP):
{
IndexPointer iptr = indices;
for(GLsizei i=3;i<count;i+=2,iptr+=2)
{
operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+3)]);
}
break;
}
case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
case(GL_TRIANGLE_FAN):
{
IndexPointer iptr = indices;
Vec3& vfirst = _vertexArrayPtr[*iptr];
++iptr;
for(GLsizei i=2;i<count;++i,++iptr)
{
operator()(vfirst,_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)]);
}
break;
}
case(GL_POINTS):
case(GL_LINES):
case(GL_LINE_STRIP):
case(GL_LINE_LOOP):
default:
// can't be converted into to triangles.
break;
}
}
/** begin(..),vertex(..) & end() are convinience methods for adapting
* non vertex array primitives to vertex array based primitives.
* this is done to simplify the implementation of primtive functor
* subclasses - users only need override drawArray and drawElements.*/
inline void begin(GLenum mode)
{
_modeCache = mode;
_vertexCache.clear();
}
inline void vertex(const Vec3& vert) { _vertexCache.push_back(vert); }
inline void vertex(float x,float y,float z) { _vertexCache.push_back(osg::Vec3(x,y,z)); }
inline void end()
{
if (!_vertexCache.empty())
{
setVertexArray(_vertexCache.size(),&_vertexCache.front());
drawArrays(_modeCache,0,_vertexCache.size());
}
}
protected:
unsigned int _vertexArraySize;
Vec3* _vertexArrayPtr;
GLenum _modeCache;
std::vector<Vec3> _vertexCache;
};
}