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include/modules/raytracer/raytracer_scene.h

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+/* -----------------------------------------------------------------------------
+	GSFramework
+	Copyright 2001-2013 Emmanuel Julien. All Rights Reserved.
+----------------------------------------------------------------------------- */
+
+
+#ifndef	__NRAYTRACERSCENE__
+#define	__NRAYTRACERSCENE__
+
+
+		#include "core/geometry_tree.h"
+		#include "bih/bih.h"
+
+
+namespace GS {
+
+	namespace Core {
+		class Object;
+		class Geometry;
+		struct Material;
+	}
+	namespace S3D {
+		class Scene;
+		struct MLight;
+		struct MObject;
+	}
+	namespace Raytrace {
+		using Core::IGeometryTree;
+
+//
+struct	Trace : public Core::GeometryTrace
+{
+		Vector4			pi;					///< Intersection point.
+		Vector4			n;					///< Normal.
+
+		float			ir;					///< Current media index of refraction.
+		float			td;					///< Total distance traveled by the ray.
+
+		Core::Object	*o;					///< Object intersected.
+
+		Trace(bool closest = true) : Core::GeometryTrace(closest)
+		{
+			ir = 1;
+			td = 0;
+			m = NULL;
+		}
+};
+
+///
+struct	Object
+{
+		Core::Object	*o;					///< Object.
+		Core::sGeometry	og, g;				///< Associated geometry.
+
+		AutoPtr <IGeometryTree> tree;
+
+		Object() : o(0) {}
+};
+
+///
+struct	Light
+{
+		IGeometryTree	*g;					///< Shadow cache tree.
+		uint			ip;					///< Shadow cache polygon index.
+
+		S3D::MLight		*l;
+
+		Light() : l(0) {}
+};
+
+/*!
+	@short	Raytracer scene acceleration structure.
+*/
+class	SceneBIH : BIH::Tree
+{
+		Array <Object> obj;					///< Object array.
+
+		/// Trace leaf content.
+		void		TraceLeaf(BIH::Node *, float tmin, float tmax, BIH::Trace &, void *parm = 0);
+
+		/// Add an object to the scene BIH.
+		void		AddObject(Core::ResourceFactory &, S3D::MObject *, uint &obj_count, MinMax *varray, bool shadow);
+
+public:
+
+		/*!
+			@short	Translate proxy geometry.
+
+			The raytracer may need to make a hard copy of a geometry for example
+			to freeze its modifiers before building the acceleration structure.
+
+			This function returns the original geometry from the proxy one as
+			returned by a primary ray test.
+
+			@note	If the geometry is not a proxy, it will be returned as is.
+		*/
+		Core::Geometry *TranslateGeometry(Core::Geometry *) const;
+
+/*!
+	@group	Statistics
+	@{
+*/
+		uint		ray_count;				///< Number of ray traced.
+
+		/// Reset internal statistic counters.
+		void		ResetStats();
+/// @}
+
+		/// Build scene tree based on a scene instance.
+virtual bool		SetScene(Core::ResourceFactory &, const S3D::Scene *, bool shadow = false);
+		/// Free tree structures.
+virtual void		Free();
+
+		/// Raytrace hierarchy.
+virtual	void		RaytraceScene(Trace &, const Vector4 &s, const Vector4 &d, float l = -1.f);
+
+		SceneBIH() { min_leaf_vcount = 3; }
+};
+
+	} // Raytrace
+} // GS
+
+
+#endif	// __NRAYTRACERSCENE__