X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fbuilders%2Fcapsule.cpp;fp=source%2Fbuilders%2Fcapsule.cpp;h=65a18eb3e2cbf6e8915d4c239b4a4460dc4b4eb3;hb=7aaec9a70b8d7733429bec043f8e33e02956f266;hp=0000000000000000000000000000000000000000;hpb=bec07999d95b76f4b47cffcc564d0cd0afc0435e;p=libs%2Fgl.git

diff --git a/source/builders/capsule.cpp b/source/builders/capsule.cpp
new file mode 100644
index 00000000..65a18eb3
--- /dev/null
+++ b/source/builders/capsule.cpp
@@ -0,0 +1,74 @@
+#define _USE_MATH_DEFINES
+#include <cmath>
+#include "capsule.h"
+#include "primitivebuilder.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+CapsuleBuilder::CapsuleBuilder(float r, float l, unsigned s, unsigned n):
+	radius(r),
+	length(l),
+	segments(s),
+	rings(n)
+{
+	if(segments<3)
+		segments = 3;
+	rings |= 1;
+	if(rings<3)
+		rings = 3;
+}
+
+void CapsuleBuilder::build(PrimitiveBuilder &builder) const
+{
+	float u_scale = 1.0/segments;
+	float v_scale = 1/(length+radius*M_PI);
+	adjust_texture_scale(u_scale, v_scale, radius*M_PI*2, length+radius*M_PI);
+
+	builder.normal(0, 0, -1);
+	builder.texcoord(0.5, 0);
+	builder.vertex(0, 0, -length/2-radius);
+	for(unsigned i=1; i<rings; ++i)
+	{
+		float cz = length*(i>rings/2 ? 0.5 : -0.5);
+		float v = ((i>rings/2 ? i-1 : i)*radius*M_PI/(rings-1)+(i>rings/2 ? length : 0))*v_scale;
+		float ra = (i>rings/2 ? i-1 : i)*M_PI/(rings-1);
+		float rc = cos(ra);
+		float rs = sin(ra);
+		for(unsigned j=0; j<=segments; ++j)
+		{
+			float sa = j*M_PI*2/segments;
+			float sc = cos(sa);
+			float ss = sin(sa);
+			builder.normal(rs*sc, rs*ss, -rc);
+			if(generate_tbn)
+			{
+				builder.tangent(-ss, sc, 0);
+				builder.binormal(rc*sc, rc*ss, rs);
+			}
+			builder.texcoord(j*u_scale, v);
+			builder.vertex(rs*sc*radius, rs*ss*radius, cz-rc*radius);
+		}
+	}
+	builder.normal(0, 0, 1);
+	builder.texcoord(0.5, (length+radius*M_PI)*v_scale);
+	builder.vertex(0, 0, length/2+radius);
+
+	for(unsigned i=0; i<segments; ++i)
+	{
+		builder.begin(TRIANGLE_STRIP);
+		builder.element(0);
+		for(unsigned j=0; j+1<rings; ++j)
+		{
+			builder.element(1+j*(segments+1)+i+1);
+			builder.element(1+j*(segments+1)+i);
+		}
+		builder.element((segments+1)*(rings-1)+1);
+		builder.end();
+	}
+}
+
+} // namespace GL
+} // namespace Msp