X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbuilders%2Fbox.cpp;fp=source%2Fbuilders%2Fbox.cpp;h=46f1b48ed7bfc315a23a221134544adcccf5c19e;hb=7aaec9a70b8d7733429bec043f8e33e02956f266;hp=0000000000000000000000000000000000000000;hpb=bec07999d95b76f4b47cffcc564d0cd0afc0435e;p=libs%2Fgl.git

diff --git a/source/builders/box.cpp b/source/builders/box.cpp
new file mode 100644
index 00000000..46f1b48e
--- /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