119 lines
4 KiB
C
119 lines
4 KiB
C
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#pragma once
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#include <vector>
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#include <deque>
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#include <cgv/math/fvec.h>
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namespace cgv {
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namespace media {
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namespace mesh {
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/** pure abstract interface to handle callbacks of a streaming mesh */
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struct streaming_mesh_callback_handler
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{
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/// called when a new vertex is generated
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virtual void new_vertex(unsigned int vertex_index) = 0;
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/// announces a new polygon defines by the vertex indices stored in the given vector
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virtual void new_polygon(const std::vector<unsigned int>& vertex_indices) = 0;
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/// drop the currently first vertex that has the given global vertex index
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virtual void before_drop_vertex(unsigned int vertex_index) = 0;
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};
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/// class used to perform the marching cubes algorithm
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template <typename T>
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class streaming_mesh
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{
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public:
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/// type of vertex locations
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typedef cgv::math::fvec<T,3> pnt_type;
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/// type of vertex normals
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typedef cgv::math::fvec<T,3> vec_type;
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protected:
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/// offset used to address vertices in deque
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int idx_off;
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/// count the number of faces
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unsigned int nr_faces;
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/// store currently used points in deque
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std::deque<pnt_type> pnts;
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/// store currently used normals in deque
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std::deque<vec_type> nmls;
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/// store a pointer to the callback handler
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streaming_mesh_callback_handler* smcbh;
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public:
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/// construct from callback handler
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streaming_mesh(streaming_mesh_callback_handler* _smcbh = 0) : smcbh(_smcbh), nr_faces(0), idx_off(0) {
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}
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/// set a new callback handler
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void set_callback_handler(streaming_mesh_callback_handler* _smcbh) {
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smcbh = _smcbh;
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}
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/// return the number of vertices dropped from the front, what is used as index offset into a deque
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unsigned int get_nr_dropped_vertices() const { return idx_off; }
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/// return the number of vertices
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unsigned int get_nr_vertices() const { return (unsigned int) pnts.size()+idx_off; }
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/// return the number of faces
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unsigned int get_nr_faces() const { return nr_faces; }
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/// drop the front most vertex from the deque
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void drop_vertex() {
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if (pnts.empty())
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return;
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if (smcbh)
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smcbh->before_drop_vertex(idx_off);
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pnts.pop_front();
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nmls.pop_front();
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++idx_off;
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}
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/// drop n vertices from the front of the deque
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void drop_vertices(unsigned int n) {
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for (unsigned int i=0; i<n; ++i)
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drop_vertex();
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}
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/// write access to vertex locations
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pnt_type& vertex_location(unsigned int vi) { return pnts[vi-idx_off]; }
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/// read access to vertex locations
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const pnt_type& vertex_location(unsigned int vi) const { return pnts[vi-idx_off]; }
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/// read access to vertex normals
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const vec_type& vertex_normal(unsigned int vi) const { return nmls[vi-idx_off]; }
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/// write access to vertex normals
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vec_type& vertex_normal(unsigned int vi) { return nmls[vi-idx_off]; }
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/// add a new vertex with the given location and call the callback of the callback handler
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unsigned int new_vertex(const pnt_type& p) {
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unsigned int vi = (int)pnts.size()+idx_off;
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pnts.push_back(p);
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nmls.push_back(vec_type(0,0,0));
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if (smcbh)
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smcbh->new_vertex(vi);
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return vi;
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}
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/// construct a new triangle by calling the new polygon method of the callback handler
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void new_triangle(unsigned int vi, unsigned int vj, unsigned int vk) {
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static std::vector<unsigned int> vis(3);
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vis[0] = vi;
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vis[1] = vj;
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vis[2] = vk;
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++nr_faces;
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if (smcbh)
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smcbh->new_polygon(vis);
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}
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/// construct a new quad by calling the new polygon method of the callback handler
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void new_quad(unsigned int vi, unsigned int vj, unsigned int vk, unsigned int vl) {
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static std::vector<unsigned int> vis(4);
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vis[0] = vi;
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vis[1] = vj;
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vis[2] = vk;
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vis[3] = vl;
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++nr_faces;
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if (smcbh)
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smcbh->new_polygon(vis);
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}
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/// construct a new polygon by calling the new polygon method of the callback handler
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void new_polygon(const std::vector<unsigned int>& vertex_indices) {
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++nr_faces;
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if (smcbh)
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smcbh->new_polygon(vertex_indices);
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}
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};
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}
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}
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}
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