void VertexBufferBase::drawBoundingSphere(VertexBufferState& state ) const
{
GLuint displayList = state.getDisplayList( &_boundingSphere );
if( displayList == state.INVALID )
{
displayList = state.newDisplayList( &_boundingSphere );
glNewList( displayList, GL_COMPILE );
const float x = _boundingSphere.x();
const float y = _boundingSphere.y();
const float z = _boundingSphere.z();
const float x1 = x - _boundingSphere.w();
const float x2 = x + _boundingSphere.w();
const float y1 = y - _boundingSphere.w();
const float y2 = y + _boundingSphere.w();
const float z1 = z - _boundingSphere.w();
const float z2 = z + _boundingSphere.w();
const float size = _boundingSphere.w();
glBegin( GL_QUADS );
glNormal3f( 1.0f, 0.0f, 0.0f );
glVertex3f( x1, y - size, z - size );
glVertex3f( x1, y + size, z - size );
glVertex3f( x1, y + size, z + size );
glVertex3f( x1, y - size, z + size );
glNormal3f( -1.0f, 0.0f, 0.0f );
glVertex3f( x2, y - size, z - size );
glVertex3f( x2, y - size, z + size );
glVertex3f( x2, y + size, z + size );
glVertex3f( x2, y + size, z - size );
glNormal3f( 0.0f, -1.0f, 0.0f );
glVertex3f( x - size, y2, z - size );
glVertex3f( x + size, y2, z - size );
glVertex3f( x + size, y2, z + size );
glVertex3f( x - size, y2, z + size );
glNormal3f( 0.0f, 1.0f, 0.0f );
glVertex3f( x - size, y1, z - size );
glVertex3f( x - size, y1, z + size );
glVertex3f( x + size, y1, z + size );
glVertex3f( x + size, y1, z - size );
glNormal3f( 0.0f, 0.0f, -1.0f );
glVertex3f( x - size, y - size, z2 );
glVertex3f( x - size, y + size, z2 );
glVertex3f( x + size, y + size, z2 );
glVertex3f( x + size, y - size, z2 );
glNormal3f( 0.0f, 0.0f, 1.0f );
glVertex3f( x - size, y - size, z1 );
glVertex3f( x + size, y - size, z1 );
glVertex3f( x + size, y + size, z1 );
glVertex3f( x - size, y + size, z1 );
glEnd();
glEndList();
}
glCallList( displayList );
}
/* Render the leaf with a display list. */
inline
void VertexBufferLeaf::renderDisplayList( VertexBufferState& state ) const
{
char* key = (char*)( this );
if( state.useColors( ))
++key;
GLuint displayList = state.getDisplayList( key );
if( displayList == state.INVALID )
setupRendering( state, &displayList );
glCallList( displayList );
}