3 This file is part of libmspgl
4 Copyright © 2011 Mikko Rasa, Mikkosoft Productions
5 Distributed under the LGPL
10 #include "primitivebuilder.h"
17 CapsuleBuilder::CapsuleBuilder(float r, float l, unsigned s, unsigned n):
30 void CapsuleBuilder::build(PrimitiveBuilder &builder) const
32 float u_scale = 1.0/segments;
33 float v_scale = 1/(length+radius*M_PI);
34 adjust_texture_scale(u_scale, v_scale, radius*M_PI*2, length+radius*M_PI);
36 builder.normal(0, 0, -1);
37 builder.texcoord(0.5, 0);
38 builder.vertex(0, 0, -length/2-radius);
39 for(unsigned i=1; i<rings; ++i)
41 float cz = length*(i>rings/2 ? 0.5 : -0.5);
42 float v = ((i>rings/2 ? i-1 : i)*radius*M_PI/(rings-1)+(i>rings/2 ? length : 0))*v_scale;
43 float ra = (i>rings/2 ? i-1 : i)*M_PI/(rings-1);
46 for(unsigned j=0; j<=segments; ++j)
48 float sa = j*M_PI*2/segments;
51 builder.normal(rs*sc, rs*ss, -rc);
53 builder.attrib(tangent_attr, -ss, sc, 0);
55 builder.attrib(binormal_attr, rc*sc, rc*ss, rs);
56 builder.texcoord(j*u_scale, v);
57 builder.vertex(rs*sc*radius, rs*ss*radius, cz-rc*radius);
60 builder.normal(0, 0, 1);
61 builder.texcoord(0.5, (length+radius*M_PI)*v_scale);
62 builder.vertex(0, 0, length/2+radius);
64 for(unsigned i=0; i<segments; ++i)
66 builder.begin(GL::TRIANGLE_STRIP);
68 for(unsigned j=0; j+1<rings; ++j)
70 builder.element(1+j*(segments+1)+i+1);
71 builder.element(1+j*(segments+1)+i);
73 builder.element((segments+1)*(rings-1)+1);