Ported osgGLUT based src/Demos across to being osgProducer based, and placed

them in the new examples/ directory.

examples/osghangglide/tank.cpp

@@ -0,0 +1,166 @@
+#include <math.h>
+
+#include <osg/GL>
+#include <osg/Group>
+#include <osg/Geode>
+#include <osg/Geometry>
+#include <osg/Texture2D>
+#include <osg/TexEnv>
+#include <osg/StateSet>
+#include <osg/Matrix>
+
+#include <osgDB/ReadFile>
+
+#ifdef _MSC_VER
+#pragma warning( disable : 4244 )
+#pragma warning( disable : 4305 )
+#endif
+
+using namespace osg;
+
+extern void getDatabaseCenterRadius( float dbcenter[3], float *dbradius );
+
+static float radius = 2.0;
+static float dbcenter[3], dbradius;
+
+static void conv( const Vec3& a, const Matrix& mat, Vec3& b )
+{
+    int i;
+    Vec3 t;
+
+    for( i = 0; i < 3; i++ )
+    {
+        t[i] =  (a[0] * mat(0,i)) +
+            (a[1] * mat(1,i)) +
+            (a[2] * mat(2,i)) +
+            mat(3,i);
+    }
+    b[0] = t[0];
+    b[1] = t[1];
+    b[2] = t[2];
+}
+
+
+Node *makeTank( void )
+{
+
+    Geode *geode = new Geode;
+
+    getDatabaseCenterRadius( dbcenter, &dbradius );
+
+    Matrix mat(
+        0.05, 0, 0, 0,
+        0, 0.05, 0, 0,
+        0, 0, 0.05, 0,
+        1.5999 - 0.3,
+        3.1474,
+        dbcenter[2] + 0.6542 - 0.09,
+        1
+        );
+
+    // 42 required for sodes, 22 for the top.
+    Vec3Array& vc = *(new Vec3Array(42+22));
+    Vec2Array& tc = *(new Vec2Array(42+22));
+
+    Geometry *gset = new Geometry;
+    gset->setVertexArray( &vc );
+    gset->setTexCoordArray( 0, &tc );
+
+    // create the sides of the tank.
+    unsigned int i, c = 0;
+    for( i = 0; i <= 360; i += 18 )
+    {
+        float x, y, z;
+        float s, t;
+        float theta = osg::DegreesToRadians((float)i);
+
+        s = (float)i/90.0;
+        t = 1.0;
+
+        x = radius * cosf( theta );
+        y = radius * sinf( theta );
+        z = 1.0;
+
+        vc[c][0] = x;
+        vc[c][1] = y;
+        vc[c][2] = z;
+
+        tc[c][0] = s;
+        tc[c][1] = t;
+
+        c++;
+
+        t = 0.0;
+        z = 0.0;
+
+        vc[c][0] = x;
+        vc[c][1] = y;
+        vc[c][2] = z;
+
+        tc[c][0] = s;
+        tc[c][1] = t;
+        c++;
+    }
+
+    gset->addPrimitiveSet( new DrawArrays(PrimitiveSet::TRIANGLE_STRIP,0,c) );
+
+    // create the top of the tank.
+
+    int prev_c = c;
+
+    vc[c][0] = 0.0f;
+    vc[c][1] = 0.0f;
+    vc[c][2] = 1.0f;
+
+    tc[c][0] = 0.0f;
+    tc[c][1] = 0.0f;
+    c++;
+
+    for( i = 0; i <= 360; i += 18 )
+    {
+        float x, y, z;
+        float s, t;
+        float theta = osg::DegreesToRadians((float)i);
+
+        //    s = (float)i/360.0;
+        //   t = 1.0;
+        s = cosf( theta );
+        t = sinf( theta );
+
+        x = radius * cosf( theta );
+        y = radius * sinf( theta );
+        z = 1.0;
+
+        vc[c][0] = x;
+        vc[c][1] = y;
+        vc[c][2] = z;
+
+        tc[c][0] = s;
+        tc[c][1] = t;
+
+        c++;
+    }
+
+    for( i = 0; i < c; i++ )
+        conv( vc[i], mat, vc[i] );
+     
+     gset->addPrimitiveSet(new DrawArrays(PrimitiveSet::TRIANGLE_FAN,prev_c,c-prev_c));
+
+
+
+
+    Texture2D *tex = new Texture2D;
+
+    tex->setWrap( Texture2D::WRAP_S, Texture2D::REPEAT );
+    tex->setWrap( Texture2D::WRAP_T, Texture2D::REPEAT );
+    tex->setImage(osgDB::readImageFile("Images/tank.rgb"));
+
+    StateSet *dstate = new StateSet;
+    dstate->setTextureAttributeAndModes(0, tex, StateAttribute::ON );
+    dstate->setTextureAttribute(0, new TexEnv );
+
+    gset->setStateSet( dstate );
+    geode->addDrawable( gset );
+
+    return geode;
+}