Add opencsg.

OpenCSG is a library that does image-based CSG rendering using OpenGL.
OpenCSG is written in C++ and supports most modern graphics hardware.

WWW: http://www.opencsg.org/

Obtained from (slightly):	OpenBSD

graphics/Makefile

@@ -564,6 +564,7 @@
     SUBDIR += ocropus
     SUBDIR += ogre3d
     SUBDIR += openclipart
+    SUBDIR += opencsg
     SUBDIR += opencv
     SUBDIR += opencv-core
     SUBDIR += opendis

graphics/opencsg/Makefile

@@ -0,0 +1,36 @@
+# New ports collection makefile for:	opencsg
+# Date created:				17 August 2011
+# Whom:					Michael Reifenberger <mr@freebsd.org>
+#
+# $FreeBSD$
+#
+
+PORTNAME=	opencsg
+PORTVERSION=	1.3.1
+#PORTREVISION=	0
+CATEGORIES=	graphics
+MASTER_SITES=	http://www.opencsg.org/
+DISTNAME=	OpenCSG-${PORTVERSION}
+
+MAINTAINER=	mr@FreeBSD.org
+COMMENT=	Constructive Solid Geometry rendering library
+
+USE_GL=		glew
+WRKSRC=		${WRKDIR}/${DISTNAME}/src
+
+USE_QT_VER=     4
+QT_COMPONENTS=  qmake_build
+PLIST_SUB=      PORTVERSION=${PORTVERSION}
+#MAKE_JOBS_UNSAFE=yes
+
+do-configure:
+	cd ${WRKSRC} && ${QMAKE} src.pro
+
+do-install:
+	${INSTALL_LIB} ${WRKDIR}/${DISTNAME}/lib/libopencsg.so.${PORTVERSION} \
+		${PREFIX}/lib
+	${LN} -sf libopencsg.so.${PORTVERSION} ${PREFIX}/lib/libopencsg.so.1
+	${LN} -sf libopencsg.so.${PORTVERSION} ${PREFIX}/lib/libopencsg.so
+	${INSTALL_DATA} ${WRKDIR}/${DISTNAME}/include/opencsg.h ${PREFIX}/include
+
+.include <bsd.port.mk>

graphics/opencsg/distinfo

@@ -0,0 +1,2 @@
+SHA256 (OpenCSG-1.3.1.tar.gz) = d1e4f2404158e1a4084450288826e94f5286fb35766889cf8a84f6be3b27a0d9
+SIZE (OpenCSG-1.3.1.tar.gz) = 661106

graphics/opencsg/pkg-descr

@@ -0,0 +1,20 @@
+OpenCSG is a library that does image-based CSG rendering using OpenGL.
+OpenCSG is written in C++ and supports most modern graphics hardware.
+
+CSG is short for Constructive Solid Geometry and denotes an approach
+to model complex 3D-shapes using simpler ones. I.e., two shapes can be
+combined by taking the union of them, by intersecting them, or by
+subtracting one shape of the other. The most basic shapes, which are
+not result of such a CSG operation, are called primitives. Primitives
+must be solid, i.e., they must have a clearly defined interior and
+exterior. By construction, a CSG shape is also solid then.
+
+Image-based CSG rendering (also z-buffer CSG rendering) is a term that
+denotes algorithms for rendering CSG shapes without an explicit
+calculation of the geometric boundary of a CSG shape. Such algorithms
+use frame-buffer settings of the graphics hardware, e.g., the depth
+and stencil buffer, to compose CSG shapes. OpenCSG implements a
+variety of those algorithms, namely the Goldfeather algorithm and the
+SCS algorithm, both of them in several variants.
+
+WWW: http://www.opencsg.org/

graphics/opencsg/pkg-plist

@@ -0,0 +1,4 @@
+include/opencsg.h
+lib/libopencsg.so.%%PORTVERSION%%
+lib/libopencsg.so.1
+lib/libopencsg.so