337 lines
11 KiB
Plaintext
337 lines
11 KiB
Plaintext
//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
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//Distributed under the terms of the GNU Library General Public License (LGPL)
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//as published by the Free Software Foundation.
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#ifndef OSG_TRIANGLEFUNCTOR
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#define OSG_TRIANGLEFUNCTOR 1
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#include <osg/Drawable>
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namespace osg {
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template<class T>
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class TriangleFunctor : public Drawable::PrimitiveFunctor, public T
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{
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public:
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TriangleFunctor()
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{
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_vertexArraySize=0;
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_vertexArrayPtr=0;
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_modeCache=0;
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}
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virtual ~TriangleFunctor() {}
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virtual void setVertexArray(unsigned int count,const Vec3* vertices)
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{
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_vertexArraySize = count;
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_vertexArrayPtr = vertices;
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}
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virtual void drawArrays(GLenum mode,GLint first,GLsizei count)
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{
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if (_vertexArrayPtr==0 && count==0) return;
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switch(mode)
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{
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case(GL_TRIANGLES):
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{
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const Vec3* vlast = &_vertexArrayPtr[first+count];
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for(const Vec3* vptr=&_vertexArrayPtr[first];vptr<vlast;vptr+=3)
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operator()(*(vptr),*(vptr+1),*(vptr+2));
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break;
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}
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case(GL_TRIANGLE_STRIP):
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{
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const Vec3* vptr = &_vertexArrayPtr[first];
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for(GLsizei i=2;i<count;++i,++vptr)
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{
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if ((i%2)) operator()(*(vptr),*(vptr+2),*(vptr+1));
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else operator()(*(vptr),*(vptr+1),*(vptr+2));
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}
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break;
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}
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case(GL_QUADS):
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{
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const Vec3* vptr = &_vertexArrayPtr[first];
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for(GLsizei i=3;i<count;i+=4,vptr+=4)
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{
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operator()(*(vptr),*(vptr+1),*(vptr+2));
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operator()(*(vptr),*(vptr+2),*(vptr+3));
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}
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break;
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}
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case(GL_QUAD_STRIP):
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{
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const Vec3* vptr = &_vertexArrayPtr[first];
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for(GLsizei i=3;i<count;i+=2,vptr+=2)
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{
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operator()(*(vptr),*(vptr+1),*(vptr+2));
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operator()(*(vptr+1),*(vptr+3),*(vptr+2));
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}
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break;
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}
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case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
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case(GL_TRIANGLE_FAN):
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{
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const Vec3* vfirst = &_vertexArrayPtr[first];
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const Vec3* vptr = vfirst+1;
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for(GLsizei i=2;i<count;++i,++vptr)
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{
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operator()(*(vfirst),*(vptr),*(vptr+1));
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}
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break;
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}
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case(GL_POINTS):
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case(GL_LINES):
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case(GL_LINE_STRIP):
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case(GL_LINE_LOOP):
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default:
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// can't be converted into to triangles.
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break;
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}
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}
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virtual void drawElements(GLenum mode,GLsizei count,const GLubyte* indices)
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{
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if (indices==0 || count==0) return;
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typedef const GLubyte* IndexPointer;
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switch(mode)
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{
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case(GL_TRIANGLES):
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{
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IndexPointer ilast = &indices[count];
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for(IndexPointer iptr=indices;iptr<ilast;iptr+=3)
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operator()(_vertexArrayPtr[*iptr],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
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break;
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}
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case(GL_TRIANGLE_STRIP):
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{
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IndexPointer iptr = indices;
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for(GLsizei i=2;i<count;++i,++iptr)
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{
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if ((i%2)) operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+1)]);
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else operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
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}
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break;
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}
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case(GL_QUADS):
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{
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IndexPointer iptr = indices;
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for(GLsizei i=3;i<count;i+=4,iptr+=4)
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{
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operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
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operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+3)]);
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}
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break;
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}
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case(GL_QUAD_STRIP):
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{
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IndexPointer iptr = indices;
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for(GLsizei i=3;i<count;i+=2,iptr+=2)
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{
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operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
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operator()(_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+3)],_vertexArrayPtr[*(iptr+2)]);
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}
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break;
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}
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case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
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case(GL_TRIANGLE_FAN):
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{
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IndexPointer iptr = indices;
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const Vec3& vfirst = _vertexArrayPtr[*iptr];
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++iptr;
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for(GLsizei i=2;i<count;++i,++iptr)
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{
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operator()(vfirst,_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)]);
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}
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break;
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}
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case(GL_POINTS):
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case(GL_LINES):
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case(GL_LINE_STRIP):
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case(GL_LINE_LOOP):
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default:
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// can't be converted into to triangles.
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break;
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}
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}
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virtual void drawElements(GLenum mode,GLsizei count,const GLushort* indices)
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{
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if (indices==0 || count==0) return;
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typedef const GLushort* IndexPointer;
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switch(mode)
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{
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case(GL_TRIANGLES):
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{
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IndexPointer ilast = &indices[count];
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for(IndexPointer iptr=indices;iptr<ilast;iptr+=3)
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{
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operator()(_vertexArrayPtr[*iptr],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
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}
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break;
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}
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case(GL_TRIANGLE_STRIP):
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{
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IndexPointer iptr = indices;
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for(GLsizei i=2;i<count;++i,++iptr)
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{
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if ((i%2)) operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+1)]);
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else operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
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}
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break;
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}
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case(GL_QUADS):
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{
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IndexPointer iptr = indices;
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for(GLsizei i=3;i<count;i+=4,iptr+=4)
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{
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operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
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operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+3)]);
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}
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break;
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}
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case(GL_QUAD_STRIP):
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{
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IndexPointer iptr = indices;
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for(GLsizei i=3;i<count;i+=2,iptr+=2)
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{
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operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
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operator()(_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+3)],_vertexArrayPtr[*(iptr+2)]);
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}
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break;
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}
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case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
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case(GL_TRIANGLE_FAN):
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{
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IndexPointer iptr = indices;
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const Vec3& vfirst = _vertexArrayPtr[*iptr];
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++iptr;
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for(GLsizei i=2;i<count;++i,++iptr)
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{
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operator()(vfirst,_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)]);
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}
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break;
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}
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case(GL_POINTS):
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case(GL_LINES):
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case(GL_LINE_STRIP):
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case(GL_LINE_LOOP):
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default:
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// can't be converted into to triangles.
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break;
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}
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}
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virtual void drawElements(GLenum mode,GLsizei count,const GLuint* indices)
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{
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if (indices==0 || count==0) return;
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typedef const GLuint* IndexPointer;
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switch(mode)
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{
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case(GL_TRIANGLES):
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{
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IndexPointer ilast = &indices[count];
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for(IndexPointer iptr=indices;iptr<ilast;iptr+=3)
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operator()(_vertexArrayPtr[*iptr],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
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break;
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}
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case(GL_TRIANGLE_STRIP):
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{
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IndexPointer iptr = indices;
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for(GLsizei i=2;i<count;++i,++iptr)
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{
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if ((i%2)) operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+1)]);
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else operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
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}
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break;
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}
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case(GL_QUADS):
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{
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IndexPointer iptr = indices;
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for(GLsizei i=3;i<count;i+=4,iptr+=4)
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{
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operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
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operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+2)],_vertexArrayPtr[*(iptr+3)]);
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}
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break;
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}
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case(GL_QUAD_STRIP):
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{
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IndexPointer iptr = indices;
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for(GLsizei i=3;i<count;i+=2,iptr+=2)
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{
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operator()(_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+2)]);
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operator()(_vertexArrayPtr[*(iptr+1)],_vertexArrayPtr[*(iptr+3)],_vertexArrayPtr[*(iptr+2)]);
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}
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break;
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}
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case(GL_POLYGON): // treat polygons as GL_TRIANGLE_FAN
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case(GL_TRIANGLE_FAN):
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{
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IndexPointer iptr = indices;
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const Vec3& vfirst = _vertexArrayPtr[*iptr];
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++iptr;
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for(GLsizei i=2;i<count;++i,++iptr)
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{
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operator()(vfirst,_vertexArrayPtr[*(iptr)],_vertexArrayPtr[*(iptr+1)]);
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}
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break;
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}
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case(GL_POINTS):
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case(GL_LINES):
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case(GL_LINE_STRIP):
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case(GL_LINE_LOOP):
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default:
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// can't be converted into to triangles.
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break;
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}
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}
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/** begin(..),vertex(..) & end() are convinience methods for adapting
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* non vertex array primitives to vertex array based primitives.
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* this is done to simplify the implementation of primtive functor
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* subclasses - users only need override drawArray and drawElements.*/
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inline void begin(GLenum mode)
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{
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_modeCache = mode;
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_vertexCache.clear();
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}
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inline void vertex(const Vec3& vert) { _vertexCache.push_back(vert); }
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inline void vertex(float x,float y,float z) { _vertexCache.push_back(osg::Vec3(x,y,z)); }
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inline void end()
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{
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if (!_vertexCache.empty())
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{
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setVertexArray(_vertexCache.size(),&_vertexCache.front());
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drawArrays(_modeCache,0,_vertexCache.size());
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}
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}
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protected:
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unsigned int _vertexArraySize;
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const Vec3* _vertexArrayPtr;
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GLenum _modeCache;
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std::vector<Vec3> _vertexCache;
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};
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}
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#endif
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