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include/engine/core/geometry_bih.h

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+/* -----------------------------------------------------------------------------
+	GSFramework
+	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
+----------------------------------------------------------------------------- */
+
+
+#ifndef	__NGEOMETRYBIH__
+#define	__NGEOMETRYBIH__
+
+
+		#include "bih/bih.h"
+		#include "core/shader_tree.h"
+		#include "core/material.h"
+		#include "core/geometry.h"
+		#include "core/geometry_tree.h"
+
+
+namespace GS {
+	namespace Core {
+		struct ResourceFactory;
+
+/// BIH ray/triangle intersection acceleration structure.
+struct	GeometryBIHAccel
+{
+	char		cu, cv;
+	Array <float> k;
+	float		d;
+};
+
+struct	GeometryBIHMaterial
+{
+	sMaterial	material;
+	sShaderTree	shader_tree;
+};
+
+/*
+	@short	Geometry polygon bounding interval hierarchy.
+
+	Raytracing/intersection acceleration structure theoretically
+	performing within 70% of the SAH/KD-Tree performances.
+
+	@author	Emmanuel Julien (ejulien@gsworks.fr)
+*/
+class	GeometryBIH : public IGeometryTree, public BIH::Tree
+{
+		Array <GeometryBIHMaterial> material_table;	///< Material table.
+		Array <uint> pol_index;
+
+		Array <GeometryBIHAccel> acc;					///< Raytracing lookup tables.
+
+		/// Trace leaf content.
+		void			TraceLeaf(BIH::Node *leaf, float tmin, float tmax, BIH::Trace &trace, void *parm = 0);
+		/// Build raytracing lookup tables.
+		bool			BuildLUT();
+
+public:
+
+		/// Return the raytracing LUT structure.
+		const GeometryBIHAccel *GetRaytracingAccelerationStructure() const { return acc; }
+
+		/// Fast polygon test.
+		bool			FastPolyTest(uint ip, Vector4 &s, Vector4 &d, float l = -1.f);
+
+		void			RaytraceGeometry(GeometryTrace &trace, const Vector4 &s, const Vector4 &d, float l = -1.f);
+		bool			BuildFromGeometry(ResourceFactory &, Geometry *);
+		void			Free();
+};
+
+/*!
+	@short	Geometry BIH tree.
+	@author	Emmanuel Julien (ejulien@gsworks.fr)
+*/
+class	GeometryBIHTree : public IGeometryTree
+{
+		GeometryBIH		bih;
+
+public:
+
+/*!
+	@name	Interface core functions.
+	@{
+*/
+		/// Raytrace the geometry tree.
+		void			RaytraceGeometry(GeometryTrace &trace, const Vector4 &s, const Vector4 &d, float l = -1.f) { bih.RaytraceGeometry(trace, s, d, l); }
+		/// Build tree from a geometry.
+		bool			BuildFromGeometry(ResourceFactory &gf, Geometry *g) { return bih.BuildFromGeometry(gf, g); }
+		/// Free all internal structures.
+		void			Free() { bih.Free(); }
+/// @}
+
+		~GeometryBIHTree()
+		{	Free();	}
+};
+
+	} // Core
+} // GS
+
+
+#endif	// __NGEOMETRYBIH__