Rearrange soucre files into subdirectories

[libs/gl.git] / source / builders / box.cpp

diff --git a/source/builders/box.cpp b/source/builders/box.cpp
new file mode 100644 (file)
index 0000000..46f1b48
--- /dev/null
+++ b/source/builders/box.cpp
@@ -0,0 +1,68 @@
+#include <cmath>
+#include "box.h"
+#include "primitivebuilder.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+BoxBuilder::BoxBuilder(float w, float h, float d):
+       origin(-w/2, -h/2, -d/2),
+       span(w, h, d)
+{ }
+
+BoxBuilder::BoxBuilder(const Vector3 &o, const Vector3 &s):
+       origin(o),
+       span(s)
+{ }
+
+void BoxBuilder::build(PrimitiveBuilder &builder) const
+{
+       builder.normal(1, 0, 0);
+       build_face(builder, Vector3(origin.x+span.x, origin.y, origin.z), Vector3(0, span.y, 0), Vector3(0, 0, span.z));
+       builder.normal(0, 1, 0);
+       build_face(builder, Vector3(origin.x+span.x, origin.y+span.y, origin.z), Vector3(-span.x, 0, 0), Vector3(0, 0, span.z));
+       builder.normal(-1, 0, 0);
+       build_face(builder, Vector3(origin.x, origin.y+span.y, origin.z), Vector3(0, -span.y, 0), Vector3(0, 0, span.z));
+       builder.normal(0, -1, 0);
+       build_face(builder, origin, Vector3(span.x, 0, 0), Vector3(0, 0, span.z));
+       builder.normal(0, 0, 1);
+       build_face(builder, Vector3(origin.x, origin.y, origin.z+span.z), Vector3(span.x, 0, 0), Vector3(0, span.y, 0));
+       builder.normal(0, 0, -1);
+       build_face(builder, Vector3(origin.x+span.x, origin.y, origin.z), Vector3(-span.x, 0, 0), Vector3(0, span.y, 0));
+}
+
+void BoxBuilder::build_face(PrimitiveBuilder &builder, const Vector3 &o, const Vector3 &s1, const Vector3 &s2) const
+{
+       float l1 = 1, l2 = 1;
+       if(generate_tbn || tex_fit!=STRETCH)
+       {
+               l1 = s1.norm();
+               l2 = s2.norm();
+       }
+
+       if(generate_tbn)
+       {
+               builder.tangent(s1/l1);
+               builder.binormal(s2/l2);
+       }
+
+       float u_size = 1;
+       float v_size = 1;
+       adjust_texture_scale(u_size, v_size, l1, l2);
+
+       builder.begin(TRIANGLE_STRIP);
+       builder.texcoord(0, v_size);
+       builder.vertex(o+s2);
+       builder.texcoord(0, 0);
+       builder.vertex(o);
+       builder.texcoord(u_size, v_size);
+       builder.vertex(o+s1+s2);
+       builder.texcoord(u_size, 0);
+       builder.vertex(o+s1);
+       builder.end();
+}
+
+} // namespace GL
+} // namespace Msp