source/box.cpp

   1 #include <cmath>
   2 #include "box.h"
   3 #include "primitivebuilder.h"
   4
   5 using namespace std;
   6
   7 namespace Msp {
   8 namespace GL {
   9
  10 BoxBuilder::BoxBuilder(float w, float h, float d):
  11         origin(-w/2, -h/2, -d/2),
  12         span(w, h, d)
  13 { }
  14
  15 BoxBuilder::BoxBuilder(const Vector3 &o, const Vector3 &s):
  16         origin(o),
  17         span(s)
  18 { }
  19
  20 void BoxBuilder::build(PrimitiveBuilder &builder) const
  21 {
  22         builder.normal(1, 0, 0);
  23         build_face(builder, Vector3(origin.x+span.x, origin.y, origin.z), Vector3(0, span.y, 0), Vector3(0, 0, span.z));
  24         builder.normal(0, 1, 0);
  25         build_face(builder, Vector3(origin.x+span.x, origin.y+span.y, origin.z), Vector3(-span.x, 0, 0), Vector3(0, 0, span.z));
  26         builder.normal(-1, 0, 0);
  27         build_face(builder, Vector3(origin.x, origin.y+span.y, origin.z), Vector3(0, -span.y, 0), Vector3(0, 0, span.z));
  28         builder.normal(0, -1, 0);
  29         build_face(builder, origin, Vector3(span.x, 0, 0), Vector3(0, 0, span.z));
  30         builder.normal(0, 0, 1);
  31         build_face(builder, Vector3(origin.x, origin.y, origin.z+span.z), Vector3(span.x, 0, 0), Vector3(0, span.y, 0));
  32         builder.normal(0, 0, -1);
  33         build_face(builder, Vector3(origin.x+span.x, origin.y, origin.z), Vector3(-span.x, 0, 0), Vector3(0, span.y, 0));
  34 }
  35
  36 void BoxBuilder::build_face(PrimitiveBuilder &builder, const Vector3 &o, const Vector3 &s1, const Vector3 &s2) const
  37 {
  38         float l1 = 1, l2 = 1;
  39         if(tangent_attr>=0 || tex_fit!=STRETCH)
  40                 l1 = sqrt(s1.x*s1.x+s1.y*s1.y+s1.z*s1.z);
  41         if(binormal_attr>=0 || tex_fit!=STRETCH)
  42                 l2 = sqrt(s2.x*s2.x+s2.y*s2.y+s2.z*s2.z);
  43
  44         if(tangent_attr>=0)
  45                 builder.attrib(tangent_attr, s1.x/l1, s1.y/l1, s1.z/l1);
  46         if(binormal_attr>=0)
  47                 builder.attrib(binormal_attr, s2.x/l2, s2.y/l2, s2.z/l2);
  48
  49         float u_size = 1;
  50         float v_size = 1;
  51         adjust_texture_scale(u_size, v_size, l1, l2);
  52
  53         builder.begin(TRIANGLE_STRIP);
  54         builder.texcoord(0, v_size);
  55         builder.vertex(o.x+s2.x, o.y+s2.y, o.z+s2.z);
  56         builder.texcoord(0, 0);
  57         builder.vertex(o.x, o.y, o.z);
  58         builder.texcoord(u_size, v_size);
  59         builder.vertex(o.x+s1.x+s2.x, o.y+s1.y+s2.y, o.z+s1.z+s2.z);
  60         builder.texcoord(u_size, 0);
  61         builder.vertex(o.x+s1.x, o.y+s1.y, o.z+s1.z);
  62         builder.end();
  63 }
  64
  65 } // namespace GL
  66 } // namespace Msp