305 lines
9.7 KiB
C++
305 lines
9.7 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 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_TRIANGLEINDEXFUNCTOR
|
|
#define OSG_TRIANGLEINDEXFUNCTOR 1
|
|
|
|
#include <osg/PrimitiveSet>
|
|
#include <osg/Notify>
|
|
|
|
namespace osg {
|
|
|
|
template<class T>
|
|
class TriangleIndexFunctor : public PrimitiveIndexFunctor, public T
|
|
{
|
|
public:
|
|
|
|
virtual void setVertexArray(unsigned int,const Vec2*) {}
|
|
virtual void setVertexArray(unsigned int ,const Vec3*) {}
|
|
virtual void setVertexArray(unsigned int,const Vec4*) {}
|
|
virtual void setVertexArray(unsigned int,const Vec2d*) {}
|
|
virtual void setVertexArray(unsigned int ,const Vec3d*) {}
|
|
virtual void setVertexArray(unsigned int,const Vec4d*) {}
|
|
|
|
virtual void drawArrays(GLenum mode,GLint first,GLsizei count)
|
|
{
|
|
switch(mode)
|
|
{
|
|
case(GL_TRIANGLES):
|
|
{
|
|
unsigned int pos=first;
|
|
for(GLsizei i=2;i<count;i+=3,pos+=3)
|
|
{
|
|
this->operator()(pos,pos+1,pos+2);
|
|
}
|
|
break;
|
|
}
|
|
case(GL_TRIANGLE_STRIP):
|
|
{
|
|
unsigned int pos=first;
|
|
for(GLsizei i=2;i<count;++i,++pos)
|
|
{
|
|
if ((i%2)) this->operator()(pos,pos+2,pos+1);
|
|
else this->operator()(pos,pos+1,pos+2);
|
|
}
|
|
break;
|
|
}
|
|
case(GL_QUADS):
|
|
{
|
|
unsigned int pos=first;
|
|
for(GLsizei i=3;i<count;i+=4,pos+=4)
|
|
{
|
|
this->operator()(pos,pos+1,pos+2);
|
|
this->operator()(pos,pos+2,pos+3);
|
|
}
|
|
break;
|
|
}
|
|
case(GL_QUAD_STRIP):
|
|
{
|
|
unsigned int pos=first;
|
|
for(GLsizei i=3;i<count;i+=2,pos+=2)
|
|
{
|
|
this->operator()(pos,pos+1,pos+2);
|
|
this->operator()(pos+1,pos+3,pos+2);
|
|
}
|
|
break;
|
|
}
|
|
case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
|
|
case(GL_TRIANGLE_FAN):
|
|
{
|
|
unsigned int pos=first+1;
|
|
for(GLsizei i=2;i<count;++i,++pos)
|
|
{
|
|
this->operator()(first,pos,pos+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,const GLubyte* indices)
|
|
{
|
|
if (indices==0 || count==0) return;
|
|
|
|
typedef GLubyte Index;
|
|
typedef const Index* IndexPointer;
|
|
|
|
switch(mode)
|
|
{
|
|
case(GL_TRIANGLES):
|
|
{
|
|
IndexPointer ilast = &indices[count];
|
|
for(IndexPointer iptr=indices;iptr<ilast;iptr+=3)
|
|
this->operator()(*iptr,*(iptr+1),*(iptr+2));
|
|
break;
|
|
}
|
|
case(GL_TRIANGLE_STRIP):
|
|
{
|
|
IndexPointer iptr = indices;
|
|
for(GLsizei i=2;i<count;++i,++iptr)
|
|
{
|
|
if ((i%2)) this->operator()(*(iptr),*(iptr+2),*(iptr+1));
|
|
else this->operator()(*(iptr),*(iptr+1),*(iptr+2));
|
|
}
|
|
break;
|
|
}
|
|
case(GL_QUADS):
|
|
{
|
|
IndexPointer iptr = indices;
|
|
for(GLsizei i=3;i<count;i+=4,iptr+=4)
|
|
{
|
|
this->operator()(*(iptr),*(iptr+1),*(iptr+2));
|
|
this->operator()(*(iptr),*(iptr+2),*(iptr+3));
|
|
}
|
|
break;
|
|
}
|
|
case(GL_QUAD_STRIP):
|
|
{
|
|
IndexPointer iptr = indices;
|
|
for(GLsizei i=3;i<count;i+=2,iptr+=2)
|
|
{
|
|
this->operator()(*(iptr),*(iptr+1),*(iptr+2));
|
|
this->operator()(*(iptr+1),*(iptr+3),*(iptr+2));
|
|
}
|
|
break;
|
|
}
|
|
case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
|
|
case(GL_TRIANGLE_FAN):
|
|
{
|
|
IndexPointer iptr = indices;
|
|
Index first = *iptr;
|
|
++iptr;
|
|
for(GLsizei i=2;i<count;++i,++iptr)
|
|
{
|
|
this->operator()(first,*(iptr),*(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,const GLushort* indices)
|
|
{
|
|
if (indices==0 || count==0) return;
|
|
|
|
typedef GLushort Index;
|
|
typedef const Index* IndexPointer;
|
|
|
|
switch(mode)
|
|
{
|
|
case(GL_TRIANGLES):
|
|
{
|
|
IndexPointer ilast = &indices[count];
|
|
for(IndexPointer iptr=indices;iptr<ilast;iptr+=3)
|
|
this->operator()(*iptr,*(iptr+1),*(iptr+2));
|
|
break;
|
|
}
|
|
case(GL_TRIANGLE_STRIP):
|
|
{
|
|
IndexPointer iptr = indices;
|
|
for(GLsizei i=2;i<count;++i,++iptr)
|
|
{
|
|
if ((i%2)) this->operator()(*(iptr),*(iptr+2),*(iptr+1));
|
|
else this->operator()(*(iptr),*(iptr+1),*(iptr+2));
|
|
}
|
|
break;
|
|
}
|
|
case(GL_QUADS):
|
|
{
|
|
IndexPointer iptr = indices;
|
|
for(GLsizei i=3;i<count;i+=4,iptr+=4)
|
|
{
|
|
this->operator()(*(iptr),*(iptr+1),*(iptr+2));
|
|
this->operator()(*(iptr),*(iptr+2),*(iptr+3));
|
|
}
|
|
break;
|
|
}
|
|
case(GL_QUAD_STRIP):
|
|
{
|
|
IndexPointer iptr = indices;
|
|
for(GLsizei i=3;i<count;i+=2,iptr+=2)
|
|
{
|
|
this->operator()(*(iptr),*(iptr+1),*(iptr+2));
|
|
this->operator()(*(iptr+1),*(iptr+3),*(iptr+2));
|
|
}
|
|
break;
|
|
}
|
|
case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
|
|
case(GL_TRIANGLE_FAN):
|
|
{
|
|
IndexPointer iptr = indices;
|
|
Index first = *iptr;
|
|
++iptr;
|
|
for(GLsizei i=2;i<count;++i,++iptr)
|
|
{
|
|
this->operator()(first,*(iptr),*(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,const GLuint* indices)
|
|
{
|
|
if (indices==0 || count==0) return;
|
|
|
|
typedef GLuint Index;
|
|
typedef const Index* IndexPointer;
|
|
|
|
switch(mode)
|
|
{
|
|
case(GL_TRIANGLES):
|
|
{
|
|
IndexPointer ilast = &indices[count];
|
|
for(IndexPointer iptr=indices;iptr<ilast;iptr+=3)
|
|
this->operator()(*iptr,*(iptr+1),*(iptr+2));
|
|
break;
|
|
}
|
|
case(GL_TRIANGLE_STRIP):
|
|
{
|
|
IndexPointer iptr = indices;
|
|
for(GLsizei i=2;i<count;++i,++iptr)
|
|
{
|
|
if ((i%2)) this->operator()(*(iptr),*(iptr+2),*(iptr+1));
|
|
else this->operator()(*(iptr),*(iptr+1),*(iptr+2));
|
|
}
|
|
break;
|
|
}
|
|
case(GL_QUADS):
|
|
{
|
|
IndexPointer iptr = indices;
|
|
for(GLsizei i=3;i<count;i+=4,iptr+=4)
|
|
{
|
|
this->operator()(*(iptr),*(iptr+1),*(iptr+2));
|
|
this->operator()(*(iptr),*(iptr+2),*(iptr+3));
|
|
}
|
|
break;
|
|
}
|
|
case(GL_QUAD_STRIP):
|
|
{
|
|
IndexPointer iptr = indices;
|
|
for(GLsizei i=3;i<count;i+=2,iptr+=2)
|
|
{
|
|
this->operator()(*(iptr),*(iptr+1),*(iptr+2));
|
|
this->operator()(*(iptr+1),*(iptr+3),*(iptr+2));
|
|
}
|
|
break;
|
|
}
|
|
case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
|
|
case(GL_TRIANGLE_FAN):
|
|
{
|
|
IndexPointer iptr = indices;
|
|
Index first = *iptr;
|
|
++iptr;
|
|
for(GLsizei i=2;i<count;++i,++iptr)
|
|
{
|
|
this->operator()(first,*(iptr),*(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;
|
|
}
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
#endif
|