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include/framework/geometry/frustum.h

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+/* -----------------------------------------------------------------------------
+	GSFramework
+	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
+----------------------------------------------------------------------------- */
+
+
+#ifndef	__NFRUSTRUM__
+#define	__NFRUSTRUM__
+
+
+		#include "geometry/plane.h"
+
+
+class	nMatrix4;
+
+namespace GS {
+
+	struct Shape;
+	class MinMax;
+
+/*!
+	@short	Frustum.
+	@author	Emmanuel Julien (ejulien@nworks.fr)
+*/
+class	Frustum
+{
+public:
+
+enum	Visibility
+{
+	Outside = 0,
+	Inside,
+	Clipped
+};
+
+enum	VolumePlane
+{
+	Top = 0,
+	Bottom,
+	Left,
+	Right,
+	Near,
+	Far
+};
+
+protected:
+
+		Vector4			vtx[8];			///< Frustum vertices.
+		Plane			plane[6];		///< Frustum planes.
+
+public:
+
+inline	const Vector4	*GetVertices() const { return vtx; }
+
+		/// Compute perspective frustum volume planes.
+		void			SetPerspective(float fov, float near, float far, const Matrix4 *m = 0, float h_ar = 1, float v_ar = 1);
+		/// Compute orthographic frustum volume planes.
+		void			SetOrthographic(float width, float height, float near, float far, const Matrix4 *m = 0, float h_ar = 1, float v_ar = 1);
+
+		/// Return the visibility flag of a vector set against this frustum.
+		Visibility		ClassifySet(uint count, const Vector4 * const GSRESTRICT set, const float offset = 0) const;
+		/// Return the visibility flag of a frustum against this frustum.
+		Visibility		ClassifyFrustrum(const Frustum &frustum) const;
+		/// Return the visibility flag of a sphere against this frustum.
+		Visibility		ClassifySphere(const Vector4 &p, float r) const;
+		/// Return the visibility flag of a minmax against this frustum.
+		Visibility		ClassifyMinMax(const MinMax &mm, const Matrix4 *m = 0) const;
+
+		/// Return the visibility flag of a shape against this frustum.
+		Visibility		ClassifyShape(const Shape &s, const Matrix4 *m = 0) const;
+};
+
+} // GS
+
+
+#endif	// __NFRUSTRUM__