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lib/maxsdk70/include/IProjectionRenderHandler.h

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+/**********************************************************************
+ *<
+	FILE:			ProjectionRenderHandler.h
+
+	DESCRIPTION:	Render time functionality for projection mapping
+
+	CREATED BY:		Michaelson Britt
+
+	HISTORY:		05-01-2004
+
+ *>	Copyright (c) 2004, All Rights Reserved.
+ **********************************************************************/
+
+
+#ifndef __PROJECTIONRENDERHANDLER_H__
+#define __PROJECTIONRENDERHANDLER_H__
+
+#include "Max.h"
+#include "resource.h"
+#include "istdplug.h"
+#include "iparamb2.h"
+#include "iparamm2.h"
+
+//-----------------------------------------------------------------------------
+// Types
+
+class IMeshWrapper;
+class IProjectionRenderMgr;
+
+
+typedef struct {
+	int v0, v1, v2;
+} GenTri;
+
+typedef struct  {
+	Point3 v0, v1, v2;
+} GenTriPoints;
+
+typedef struct {
+	Point3 uBasis, vBasis;
+} TangentBasis;
+
+
+//===========================================================================
+//
+// Class IProjectionRenderHandler
+//
+//===========================================================================
+
+class IProjectionRenderHandler {
+	public:
+		typedef struct {
+			RenderInstance*	inst;
+			IMeshWrapper*	mesh; //CAMERA SPACE mesh wrapper for the inst
+			float			dist;
+			int				faceIndex;
+			Point3			faceBary;
+			BOOL			isBackfacing;
+			int				err; //used when Project() returns FALSE
+		} ProjectionResult;
+
+		enum { ERR_NONE=0,
+			ERR_RAYMISS,	//ray did not hit a reference model
+			ERR_NONSELFACE,	//the working model face is not in the active selection, skipped
+		};
+
+
+		virtual ~IProjectionRenderHandler() {}
+		virtual void		DeleteThis() = 0;
+
+		virtual int			RenderBegin(TimeValue t, ULONG flags=0) = 0;
+		virtual int			RenderEnd(TimeValue t) = 0;
+
+		// NOTE: Init() may require several seconds to calculate sorting structures for the reference models
+		virtual BOOL		Init( RenderInstance* workingModelInst, RenderGlobalContext* rgc ) = 0;
+		virtual BOOL		Valid() = 0; //true if initialized, false otherwise
+		// Reference & working model info
+		virtual void				GetReferenceModels( Tab<RenderInstance*>& refModels ) = 0;
+		virtual IMeshWrapper*		GetWorkingModelMesh() = 0;
+		virtual RenderInstance*		GetWorkingModelInst() = 0;
+		virtual void				GetWorkingModelMask( BitArray& mask ) = 0;
+
+		// Do the projection from working model to reference model
+		virtual BOOL		Project( int faceIndex, Point3& faceBary, Point3& faceNorm, ProjectionResult& result ) = 0;
+};
+
+
+// Manager class to create render handler instances
+
+#define IPROJECTIONRENDERMGR_INTERFACE_ID Interface_ID(0x45390e61, 0x42de3b37)
+inline IProjectionRenderMgr* GetIProjectionRenderMgr()
+{return (IProjectionRenderMgr*)GetCOREInterface(IPROJECTIONRENDERMGR_INTERFACE_ID);}
+
+class IProjectionRenderMgr : public FPStaticInterface {
+	public:
+		virtual IProjectionRenderHandler* CreateProjectionRenderHandler() = 0;
+};
+
+
+//===========================================================================
+//
+// Class IMeshWrapper
+// An object defined as a set of triangles
+//
+//===========================================================================
+
+
+//FIXME: hopefully this can become a subclass of ObjectWrapper
+class IMeshWrapper {
+	public:
+		virtual void		DeleteThis() = 0;
+
+		virtual int			NumTriangles() = 0;
+		// For a given triangle, find the face number, and the index of the triangle within the face
+		virtual void		Translate( int rawTriIndex, int& faceIndex, int& faceTriIndex ) = 0;
+
+		// Transform affects the geometry & geom normals, but not the mapping data
+		virtual Matrix3		GetTM() = 0;
+		virtual void		SetTM( Matrix3 tm ) = 0;
+
+		// Geom triangles & verts
+		virtual GenTri		GetTri( int triIndex ) = 0;
+		virtual void		GetTriPoints( int triIndex, GenTriPoints& triPoints ) = 0;
+		virtual Point3		GetVert( int vertIndex ) = 0;
+		virtual int			NumVerts() = 0;
+
+		// Map triangles & verts
+		virtual BOOL		GetChannelSupport( int mapChannel ) = 0;
+		virtual GenTri		GetMapTri( int triIndex, int mapChannel ) = 0;
+		virtual void		GetMapTriPoints( int triIndex, int mapChannel, GenTriPoints& triPoints ) = 0;
+		virtual Point3		GetMapVert( int vertIndex, int mapChannel ) = 0;
+		virtual int			NumMapVerts( int mapChannel ) = 0;
+	
+		// Normals
+		virtual Point3		GetNormal( int triIndex ) = 0;
+		virtual TangentBasis GetTangentBasis( int triIndex, int mapChannel ) = 0;
+		virtual Point3		GetVertexNormal( int vertIndex, DWORD smGroup ) = 0;
+		virtual TangentBasis GetVertexTangentBasis( int vertIndex, DWORD smGroup, int mapChannel ) = 0;
+		virtual Point3		GetMapNormal( int triIndex, int mapChannel ) = 0; //UVW space
+
+		// Face properties
+		virtual MtlID		GetMtlID( int triIndex ) = 0;
+		virtual DWORD		GetSmoothingGroup( int triIndex ) = 0;
+
+		// Helpers
+		virtual void		GetPoint( int triIndex, const Point3& triBary, Point3& point ) = 0;
+		virtual void		GetMapPoint( int triIndex, const Point3& triBary, int mapChannel, Point3& uvw ) = 0;
+		virtual void		GetNormal( int triIndex, const Point3& triBary, Point3& point ) = 0;
+		virtual void		GetTangentBasis( int triIndex, const Point3& triBary, int mapChannel, TangentBasis& tangentBasis ) = 0;
+};
+
+
+#endif //__PROJECTIONRENDERHANDLER_H___