+++ /dev/null
-#include <cmath>
-#include <vector>
-#include "primitivebuilder.h"
-#include "sphere.h"
-
-using namespace std;
-
-namespace Msp {
-namespace GL {
-
-UvSphereBuilder::UvSphereBuilder(float r, unsigned s, unsigned n):
- radius(r),
- segments(s),
- rings(n)
-{
- if(segments<3)
- segments = 3;
-
- if(rings==0)
- rings = (segments+1)/2;
- else if(rings<2)
- rings = 2;
-}
-
-void UvSphereBuilder::build(PrimitiveBuilder &builder) const
-{
- float u_scale = 1.0f/segments;
- float v_scale = 1.0f/rings;
- adjust_texture_scale(u_scale, v_scale, radius*M_PI*2, radius*M_PI);
-
- for(unsigned i=0; i<=rings; ++i)
- {
- float av = i*M_PI/rings-M_PI/2;
- float cv = cos(av);
- float sv = sin(av);
-
- for(unsigned j=0; j<=segments; ++j)
- {
- float au = j*M_PI*2/segments;
- float cu = cos(au);
- float su = sin(au);
-
- builder.normal(cv*cu, cv*su, sv);
- builder.texcoord(j*u_scale, i*v_scale);
- if(generate_tbn)
- {
- builder.tangent(-su, cu, 0);
- builder.binormal(-sv*cu, -sv*su, cv);
- }
- builder.vertex(cv*cu*radius, cv*su*radius, sv*radius);
- }
- }
-
- builder.begin(TRIANGLES);
- for(unsigned j=0; j<segments; ++j)
- {
- builder.element(j);
- builder.element(segments+2+j);
- builder.element(segments+1+j);
- }
- unsigned top = (rings+1)*(segments+1)-1;
- for(unsigned j=0; j<segments; ++j)
- {
- builder.element(top-j);
- builder.element(top-(segments+2+j));
- builder.element(top-(segments+1+j));
- }
- builder.end();
-
- for(unsigned i=1; i<rings; ++i)
- {
- builder.begin(TRIANGLE_STRIP);
- unsigned base = i*(segments+1);
- for(unsigned j=0; j<=segments; ++j)
- {
- builder.element(base+segments+1+j);
- builder.element(base+j);
- }
- builder.end();
- }
-}
-
-
-// https://en.wikipedia.org/wiki/Regular_icosahedron#Cartesian_coordinates
-float IcoSphereBuilder::base_vertices[12*3] =
-{
- 0.0f, -0.5257311f, -0.8506508f,
- 0.0f, 0.5257311f, -0.8506508f,
- 0.0f, -0.5257311f, 0.8506508f,
- 0.0f, 0.5257311f, 0.8506508f,
- -0.8506508f, 0.0f, -0.5257311f,
- -0.8506508f, 0.0f, 0.5257311f,
- 0.8506508f, 0.0f, -0.5257311f,
- 0.8506508f, 0.0f, 0.5257311f,
- -0.5257311f, -0.8506508f, 0.0f,
- 0.5257311f, -0.8506508f, 0.0f,
- -0.5257311f, 0.8506508f, 0.0f,
- 0.5257311f, 0.8506508f, 0.0f
-};
-
-unsigned IcoSphereBuilder::base_triangles[20*3] =
-{
- 0, 1, 6,
- 1, 0, 4,
- 2, 3, 5,
- 3, 2, 7,
- 4, 5, 10,
- 5, 4, 8,
- 6, 7, 9,
- 7, 6, 11,
- 8, 9, 2,
- 9, 8, 0,
- 10, 11, 1,
- 11, 10, 3,
- 0, 8, 4,
- 0, 6, 9,
- 1, 4, 10,
- 1, 11, 6,
- 2, 5, 8,
- 2, 9, 7,
- 3, 10, 5,
- 3, 7, 11
-};
-
-unsigned IcoSphereBuilder::base_edges[30*2] = { 0, 0 };
-unsigned IcoSphereBuilder::base_tri_edges[20*3] = { 0, 0, 0 };
-
-IcoSphereBuilder::IcoSphereBuilder(float r, unsigned s):
- radius(r),
- subdivision(s)
-{
- if(base_edges[0]==base_edges[1])
- initialize_edges();
-}
-
-void IcoSphereBuilder::initialize_edges()
-{
- vector<int> edge_map(12*12, -1);
- unsigned next_edge = 0;
- for(unsigned i=0; i<20; ++i)
- for(unsigned j=0; j<3; ++j)
- {
- unsigned v1 = base_triangles[i*3+j];
- unsigned v2 = base_triangles[i*3+(j+1)%3];
- int e = edge_map[v1*12+v2];
- if(e<0)
- {
- e = next_edge++;
- base_edges[e*2] = v1;
- base_edges[e*2+1] = v2;
- // The other triangle using this edge will have the vertices swapped
- edge_map[v2*12+v1] = e|32;
- }
- base_tri_edges[i*3+j] = e;
- }
-}
-
-void IcoSphereBuilder::build(PrimitiveBuilder &bld) const
-{
- for(unsigned i=0; i<12; ++i)
- {
- const float *v = base_vertices+i*3;
- bld.normal(v[0], v[1], v[2]);
- bld.vertex(v[0]*radius, v[1]*radius, v[2]*radius);
- }
-
- if(subdivision>1)
- {
- vector<Vector3> edge_subdiv(30*(subdivision+1));
- for(unsigned i=0; i<30; ++i)
- {
- Vector3 v1(base_vertices+base_edges[i*2]*3);
- Vector3 v2(base_vertices+base_edges[i*2+1]*3);
- for(unsigned j=1; j<subdivision; ++j)
- {
- float t = static_cast<float>(j)/subdivision;
- Vector3 v = v1*(1.0f-t)+v2*t;
- edge_subdiv[i*(subdivision-1)+j-1] = v;
- v.normalize();
- bld.normal(v);
- bld.vertex(v*radius);
- }
- }
-
- for(unsigned i=0; i<20; ++i)
- for(unsigned j=1; j<subdivision; ++j)
- {
- unsigned e = base_tri_edges[i*3];
- Vector3 v1 = edge_subdiv[edge_vertex(e, subdivision-j)];
- e = base_tri_edges[i*3+1];
- Vector3 v2 = edge_subdiv[edge_vertex(e, j)];
- for(unsigned k=1; k<j; ++k)
- {
- float t = static_cast<float>(k)/j;
- Vector3 v = normalize(v1*(1.0f-t)+v2*t);
- bld.normal(v);
- bld.vertex(v*radius);
- }
- }
-
- for(unsigned i=0; i<20; ++i)
- {
- unsigned mid = 12+30*(subdivision-1)+i*(subdivision-1)*(subdivision-2)/2;
- for(unsigned j=1; j<=subdivision; ++j)
- {
- bld.begin(TRIANGLE_STRIP);
- if(j==subdivision)
- bld.element(base_triangles[i*3]);
- else
- bld.element(12+edge_vertex(base_tri_edges[i*3], subdivision-j));
-
- if(j==1)
- {
- bld.element(base_triangles[i*3+1]);
- bld.element(12+edge_vertex(base_tri_edges[i*3+1], j));
- }
- else
- {
- bld.element(12+edge_vertex(base_tri_edges[i*3], subdivision-j+1));
-
- if(j==subdivision)
- bld.element(12+edge_vertex(base_tri_edges[i*3+2], subdivision-1));
- else
- bld.element(mid+(j-1)*(j-2)/2);
-
- for(unsigned k=2; k<j; ++k)
- {
- bld.element(mid+(j-2)*(j-3)/2+k-2);
- if(j==subdivision)
- bld.element(12+edge_vertex(base_tri_edges[i*3+2], subdivision-k));
- else
- bld.element(mid+(j-1)*(j-2)/2+k-1);
- }
-
- bld.element(12+edge_vertex(base_tri_edges[i*3+1], j-1));
- if(j==subdivision)
- bld.element(base_triangles[i*3+2]);
- else
- bld.element(12+edge_vertex(base_tri_edges[i*3+1], j));
- }
- bld.end();
- }
- }
- }
- else
- {
- bld.begin(TRIANGLES);
- for(unsigned i=0; i<20*3; ++i)
- bld.element(base_triangles[i]);
- bld.end();
- }
-}
-
-unsigned IcoSphereBuilder::edge_vertex(unsigned e, unsigned i) const
-{
- return (e&31)*(subdivision-1)+((e&32)?subdivision-i:i)-1;
-}
-
-} // namespace GL
-} // namespace Msp
projects / libs / gl.git / blobdiff