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include/engine/core/geometry_tree.h

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+/* -----------------------------------------------------------------------------
+	GSFramework
+	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
+----------------------------------------------------------------------------- */
+
+
+#ifndef	__NGEOTREE__
+#define	__NGEOTREE__
+
+
+		#include "core/graphic_resource_factory.h"
+		#include "core/geometry.h"
+		#include "math/vector.h"
+
+
+namespace GS {
+	namespace Core {
+
+struct	GeometryTraceBase
+{
+		Geometry	*g;
+
+		float		i_t;					///< Distance to intersection from ray's origin.
+		bool		backface;				///< Hit is on the back face of the polygon.
+
+		int			ip;						///< Polygon index.
+		uint		it;						///< Triangle index in polygon.
+		uint		bi;						///< Polygon binding start index.
+		float		u, v, w;				///< Barycentric coordinates.
+
+		Material	*m;
+		ShaderTree	*st;
+};
+
+// Raytrace result.
+struct	GeometryTrace : public GeometryTraceBase
+{
+		Vector4		s;						///< Ray origin.
+		Vector4		d;						///< Ray direction.
+
+		bool		want_closest;
+		bool		has_i;					///< Do we have an intersection.
+
+		uint		node_visited;			///< Number of nodes visited.
+		uint		tri_test;				///< Number of triangle tested.
+
+		GeometryTrace(bool closest = true)
+		{
+			want_closest = closest;
+			has_i = false;
+
+			node_visited = 0;
+			tri_test = 0;
+		}
+};
+
+/*!
+	@short	Geometry abstract tree.
+	@author	Emmanuel Julien (ejulien@gsworks.fr)
+*/
+class	IGeometryTree
+{
+protected:
+
+		sGeometry		geometry;
+
+public:
+
+		Geometry		*GetGeometry() const { return geometry; }
+
+		/*!
+			@short	Specify a fixed ray origin.
+
+			This function provides the tree implementation with an optimization
+			opportunity by specifying a fixed ray origin.
+
+			@note	Pass NULL to remove hint.
+		*/
+virtual	void			SetRayOriginHint(const Vector4 *) {}
+
+/*!
+	@name	Interface core functions.
+	@{
+*/
+		/// Raytrace the geometry tree.
+virtual	void			RaytraceGeometry(GeometryTrace &, const Vector4 &s, const Vector4 &d, float length = -1.f) = 0;
+		/// Build tree from a geometry.
+virtual	bool			BuildFromGeometry(ResourceFactory &, Geometry *) = 0;
+		/// Free all internal structures.
+virtual	void			Free() = 0;
+/// @}
+
+virtual	~IGeometryTree() {}
+};
+
+	} // Core
+} // GS
+
+
+#endif	// __NGEOTREE__