MeshHandler.h

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/*********************************************************\
 *  File: MeshHandler.h                                  *
 *
 *  Copyright (C) 2002-2011 The PixelLight Team (http://www.pixellight.org/)
 *
 *  This file is part of PixelLight.
 *
 *  PixelLight is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  PixelLight is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with PixelLight. If not, see <http://www.gnu.org/licenses/>.
\*********************************************************/


#ifndef __PLMESH_MESHHANDLER_H__
#define __PLMESH_MESHHANDLER_H__
#pragma once


//[-------------------------------------------------------]
//[ Includes                                              ]
//[-------------------------------------------------------]
#include <PLCore/Base/Event/EventHandler.h>
#include <PLCore/Container/Bitset.h>
#include <PLCore/Container/ResourceManager.h>
#include <PLCore/Container/ResourceHandler.h>
#include <PLMath/Plane.h>
#include "PLMesh/Mesh.h"


//[-------------------------------------------------------]
//[ Forward declarations                                  ]
//[-------------------------------------------------------]
namespace PLMath {
    class Vector3;
    class PlaneSet;
    class AABoundingBox;
}
namespace PLGraphics {
    class Color4;
}
namespace PLRenderer {
    class Font;
    class Material;
    class Renderer;
    class Animation;
    class IndexBuffer;
    class VertexBuffer;
    class AnimationInfo;
    class MaterialHandler;
}
namespace PLMesh {
    class Mesh;
    class MeshEdge;
    class JointHandler;
    class MeshTriangle;
    class MeshLODLevel;
    class SkeletonHandler;
    class MeshAnimationManager;
}


//[-------------------------------------------------------]
//[ Namespace                                             ]
//[-------------------------------------------------------]
namespace PLMesh {


//[-------------------------------------------------------]
//[ Classes                                               ]
//[-------------------------------------------------------]
/**
*  @brief
*    Mesh handler
*
*  @remarks
*    A mesh handler will use a mesh and is able to use own materials and an own
*    vertex buffer for e.g. animations. Whenever working with meshes you should use
*    a mesh handler!\n
*    Animation example\n
*    pMH->CreateMeshAnimationManager(); // Create a mesh animation manager first!\n
*    Animation *pAnimation = pMH->GetMeshAnimationManager()->Create("attack");\n
*    pAnimation->Start(pMH->GetAnimationInfo(pAnimation->GetName()));
*
*  @note
*    - Whenever you manipulated mesh data "from outside" you need to call "MeshUpdateRequired()" to set a "dirty"-flag
*    - Animation frame changes automatically set the internal 'mesh update required'-flag
*/
class MeshHandler : public PLCore::ResourceHandler<Mesh> {


    //[-------------------------------------------------------]
    //[ Public functions                                      ]
    //[-------------------------------------------------------]
    public:
        //[-------------------------------------------------------]
        //[ Main functions                                        ]
        //[-------------------------------------------------------]
        /**
        *  @brief
        *    Constructor
        */
        PLMESH_API MeshHandler();

        /**
        *  @brief
        *    Destructor
        */
        PLMESH_API virtual ~MeshHandler();

        /**
        *  @brief
        *    Returns the used renderer
        *
        *  @return
        *    Pointer to the renderer that is used, can be a null pointer
        */
        PLMESH_API PLRenderer::Renderer *GetRenderer() const;

        /**
        *  @brief
        *    Whenever you manipulated mesh data "from outside" you need to call this function to set a "dirty"-flag
        */
        PLMESH_API void MeshUpdateRequired();

        /**
        *  @brief
        *    Returns the used mesh
        *
        *  @return
        *    Pointer to the used mesh, can be a null pointer
        *
        *  @note
        *    - Call "MeshUpdateRequired()" to set a "dirty"-flag if you manipulated the mesh
        */
        PLMESH_API Mesh *GetMesh() const;

        /**
        *  @brief
        *    Sets the used mesh
        *
        *  @param[in] pMesh
        *    Pointer to the mesh which should be used, can be a null pointer
        *
        *  @return
        *    'true' if all went fine, else 'false'
        *
        *  @note
        *    - The mesh handler materials are set to the mesh materials, therefore
        *      first load/setup a mesh and then use this function!
        *    - After a mesh itself was manipulated, for instance the material list was
        *      changed you should reset the mesh in your mesh handler!
        */
        PLMESH_API bool SetMesh(Mesh *pMesh = nullptr);

        /**
        *  @brief
        *    Updates the mesh handler
        *
        *  @param[in] fTimeDifference
        *    Past time since last frame (use e.g. PLCore::Timing::GetInstance()->GetTimeDifference())
        *  @param[in] nLODLevel
        *    LOD level to use
        *
        *  @remarks
        *    This function for instance updates the animations but will also setup
        *    individual mesh data required for drawing the mesh the mesh handler is
        *    using.
        */
        PLMESH_API void Update(float fTimeDifference, PLCore::uint32 nLODLevel = 0);

        //[-------------------------------------------------------]
        //[ Draw functions                                        ]
        //[-------------------------------------------------------]
        /**
        *  @brief
        *    Draws the mesh
        *
        *  @param[in] bBlend
        *    Draw only mesh parts which use a blended material?
        *  @param[in] bUseMaterials
        *    Use the mesh materials? If 'false' no material is bound.
        *
        *  @note
        *    - Update() must have been called before the mesh can be drawn because
        *      this function setup the individual mesh data
        */
        PLMESH_API void Draw(bool bBlend = false, bool bUseMaterials = true) const;

        /**
        *  @brief
        *    Draws the vertices of the mesh (for debugging)
        *  @param[in] cColor
        *    Color to use
        *
        *  @note
        *    - Ensure that correct render states are set...
        */
        PLMESH_API void DrawVertices(const PLGraphics::Color4 &cColor) const;

        /**
        *  @brief
        *    Draws the normals of the mesh (for debugging)
        *
        *  @param[in] cColor
        *    Color to use
        *  @param[in] mWorldViewProjection
        *    World view projection matrix to use
        *  @param[in] fScale
        *    Normal scale
        *  @param[in] fLineWidth
        *    Line width
        *
        *  @see
        *    - DrawVertices()
        */
        PLMESH_API void DrawNormals(const PLGraphics::Color4 &cColor, const PLMath::Matrix4x4 &mWorldViewProjection, float fScale = 1.0f, float fLineWidth = 1.0f) const;

        /**
        *  @brief
        *    Draws the tangents of the mesh (for debugging)
        *
        *  @param[in] cColor
        *    Color to use
        *  @param[in] mWorldViewProjection
        *    World view projection matrix to use
        *  @param[in] fScale
        *    Tangent scale
        *  @param[in] fLineWidth
        *    Line width
        *
        *  @see
        *    - DrawVertices()
        */
        PLMESH_API void DrawTangents(const PLGraphics::Color4 &cColor, const PLMath::Matrix4x4 &mWorldViewProjection, float fScale = 1.0f, float fLineWidth = 1.0f) const;

        /**
        *  @brief
        *    Draws the binormals of the mesh (for debugging)
        *
        *  @param[in] cColor
        *    Color to use
        *  @param[in] mWorldViewProjection
        *    World view projection matrix to use
        *  @param[in] fScale
        *    Binormals scale
        *  @param[in] fLineWidth
        *    Line width
        *
        *  @see
        *    - DrawVertices()
        */
        PLMESH_API void DrawBinormals(const PLGraphics::Color4 &cColor, const PLMath::Matrix4x4 &mWorldViewProjection, float fScale = 1.0f, float fLineWidth = 1.0f) const;

        /**
        *  @brief
        *    Draws the vertex numbers of the mesh (for debugging)
        *
        *  @param[in] cFont
        *    Font to use
        *  @param[in] cColor
        *    Color to use
        *  @param[in] mWorldViewProjection
        *    World view projection matrix to use
        *
        *  @see
        *    - DrawVertices()
        */
        PLMESH_API void DrawVertexNumbers(PLRenderer::Font &cFont, const PLGraphics::Color4 &cColor, const PLMath::Matrix4x4 &mWorldViewProjection) const;

        /**
        *  @brief
        *    Draws the anchor points of the mesh (for debugging)
        *
        *  @param[in] cFont
        *    Font to use
        *  @param[in] cColor
        *    Color to use
        *  @param[in] mWorldViewProjection
        *    World view projection matrix to use
        *
        *  @see
        *    - DrawVertices()
        */
        PLMESH_API void DrawAnchorPoints(PLRenderer::Font &cFont, const PLGraphics::Color4 &cColor, const PLMath::Matrix4x4 &mWorldViewProjection) const;

        //[-------------------------------------------------------]
        //[ Material functions                                    ]
        //[-------------------------------------------------------]
        /**
        *  @brief
        *    Returns the number of materials
        *
        *  @return
        *    Number of materials
        */
        PLMESH_API PLCore::uint32 GetNumOfMaterials() const;

        /**
        *  @brief
        *    Gets one of the mesh handler's materials
        *
        *  @param[in] nMaterial
        *    Number of the material to get
        *
        *  @return
        *    Pointer to the material, or a null pointer
        */
        PLMESH_API PLRenderer::Material *GetMaterial(PLCore::uint32 nMaterial = 0) const;

        /**
        *  @brief
        *    Sets one of the mesh handler's materials
        *
        *  @param[in] nMaterial
        *    Number of the material to set
        *  @param[in] pMaterial
        *    Pointer to the material to set, can be a null pointer
        *
        *  @return
        *    'true' if all went fine, else 'false'
        */
        PLMESH_API bool SetMaterial(PLCore::uint32 nMaterial, PLRenderer::Material *pMaterial);

        //[-------------------------------------------------------]
        //[ Morph target functions                                ]
        //[-------------------------------------------------------]
        /**
        *  @brief
        *    Returns an array holding the the base weight of each morph target
        *
        *  @return
        *    Morph target base weights
        *
        *  @see
        *    - Have a look at the mesh class Mesh for more morph target stuff
        *
        * @note
        *    - Use whenever possible the 'const' version of this function (performance)
        *    - The none 'const' version automatically sets the internal 'mesh update required'-flag
        */
        PLMESH_API PLCore::Array<float> &GetBaseMorphTargetWeights();
        PLMESH_API const PLCore::Array<float> &GetBaseMorphTargetWeights() const;

        /**
        *  @brief
        *    Returns an array holding the the current weight of each morph target
        *
        *  @return
        *    Current morph target weights
        *
        *  @note
        *    - This current weights are changed automatically through animations, use
        *      the base weights to set the 'general' base weight
        *
        *  @see
        *    - GetBaseMorphTargetWeights()
        *
        * @note
        *    - Use whenever possible the 'const' version of this function (performance)
        *    - The none 'const' version automatically sets the internal 'mesh update required'-flag
        */
        PLMESH_API PLCore::Array<float> &GetMorphTargetWeights();
        PLMESH_API const PLCore::Array<float> &GetMorphTargetWeights() const;

        //[-------------------------------------------------------]
        //[ Animation functions                                   ]
        //[-------------------------------------------------------]
        /**
        *  @brief
        *    Returns the skeleton handler
        *
        *  @return
        *    The mesh handlers skeleton handler, a null pointer if there's no such handler
        *
        *  @note
        *    - Call "MeshUpdateRequired()" to set a "dirty"-flag if you manipulated the skeleton
        */
        PLMESH_API SkeletonHandler *GetSkeletonHandler() const;

        /**
        *  @brief
        *    Returns the mesh animation manager
        *
        *  @return
        *    The mesh handlers animation manager, a null pointer if there's no such manager
        *
        *  @note
        *    - By default the mesh handler has no animation manager, you have
        *      to create a manager using CreateMeshAnimationManager() by yourself!
        */
        PLMESH_API MeshAnimationManager *GetMeshAnimationManager() const;
        
        /**
        *  @brief
        *    Creates the mesh animation manager
        *
        *  @param[in] sName
        *    Name of the mesh animation manager class to use, empty to
        *    destroy the actual manager without creating a new one
        *
        *  @return
        *    The created mesh handlers animation manager, a null pointer on error
        *    (maybe unknown class or the class is not derived from 'PLMesh::MeshAnimationManager')
        */
        PLMESH_API MeshAnimationManager *CreateMeshAnimationManager(const PLCore::String &sName = "PLMesh::MeshAnimationManagerSoftware");

        /**
        *  @brief
        *    Returns a list of all currently available animations
        *
        *  @param[out] lstAnimations
        *    Receives a list of all currently available animations (list is cleared automatically before it's filled)
        *
        *  @see
        *    - GetAnimationInfo()
        */
        PLMESH_API void GetAnimationsList(PLCore::Array<PLCore::String> &lstAnimations) const;

        /**
        *  @brief
        *    Returns a pointer to the requested animation information
        *
        *  @param[in] sName
        *    Name of the animation information
        *  @param[in] nLogMessage
        *    Should a warning message be written into the log if the requested
        *    animation information wasn't found? If < 0, write no log message,
        *    else the integer indicates the debug mode where the message should be written.
        *
        *  @return
        *    Pointer to the requested animation information, a null pointer if there was an error
        *
        *  @remarks
        *    Using this function you are e.g. able to backup pointers to the animation information\n
        *    in a quit comfortable way for instance in an scene node:\n
        *    m_pStandAnimation = GetMeshHandler()->GetAnimationInfo("Stand");
        *
        *  @note
        *    - This function will search for the requested animation information within the skeleton
        *      manager and the morph targets of the mesh the mesh handler is using.
        */
        PLMESH_API PLRenderer::AnimationInfo *GetAnimationInfo(const PLCore::String &sName, int nLogMessage = 1) const;

        /**
        *  @brief
        *    Returns a current joint handler
        *
        *  @param[in] sJointName
        *    Name of the joint
        *
        *  @return
        *    The requested current joint handler, a null pointer on error
        *
        *  @note
        *    - Call "MeshUpdateRequired()" to set a "dirty"-flag if you manipulated the skeleton
        */
        PLMESH_API JointHandler *GetJointHandler(const PLCore::String &sJointName) const;

        /**
        *  @brief
        *    Returns a base joint handler
        *
        *  @param[in] sJointName
        *    Name of the joint
        *
        *  @return
        *    The requested base joint handler, a null pointer on error
        *
        *  @note
        *    - Using this base joint handler you can for instance change the initial joint
        *      settings
        *    - Call "MeshUpdateRequired()" to set a "dirty"-flag if you manipulated the skeleton
        */
        PLMESH_API JointHandler *GetBaseJointHandler(const PLCore::String &sJointName) const;

        //[-------------------------------------------------------]
        //[ Visibility functions                                  ]
        //[-------------------------------------------------------]
        /**
        *  @brief
        *    Updates the mesh visibility
        *
        *  @param[in] cPlaneSet
        *    Plane set we want to check against - the planes must be in the object space
        *  @param[in] bFirst
        *    First visibility determination or add visible things?
        *
        *  @note
        *    - Current LOD level is used (see Update())
        *    - Use GetGeometryVisibility() to get the visibility of each mesh geometry
        */
        PLMESH_API void UpdateVisibility(const PLMath::PlaneSet &cPlaneSet, bool bFirst = true);

        /**
        *  @brief
        *    Returns the bit set holding the geometry visibility state
        *
        *  @return
        *    Bitset holding the geometry visibility state
        *
        *  @note
        *    - Call UpdateVisibility() to update the visibility stuff
        */
        PLMESH_API PLCore::Bitset &GetGeometryVisibility();

        //[-------------------------------------------------------]
        //[ LOD functions                                         ]
        //[-------------------------------------------------------]
        /**
        *  @brief
        *    Returns the number of mesh LOD levels
        *
        *  @return
        *    The number of mesh LOD levels
        *
        *  @see
        *    - Update()
        */
        PLMESH_API PLCore::uint32 GetNumOfLODLevels() const;

        /**
        *  @brief
        *    Returns the current used mesh LOD level index
        *
        *  @return
        *    The current used LOD level index
        *
        *  @see
        *    - Update()
        */
        PLMESH_API PLCore::uint32 GetLODLevelIndex() const;

        /**
        *  @brief
        *    Returns the current used mesh LOD level
        *
        *  @return
        *    The current used LOD level, a null pointer on error
        *
        *  @note
        *    - Don't manipulate the LOD level!
        *
        *  @see
        *    - Update()
        */
        PLMESH_API MeshLODLevel *GetLODLevel() const;

        //[-------------------------------------------------------]
        //[ Tool functions                                        ]
        //[-------------------------------------------------------]
        /**
        *  @brief
        *    Calculates the current axis aligned joint bounding box
        *
        *  @param[out] cAAB
        *    Will receive the current axis aligned joint bounding box
        *
        *  @return
        *    'true' if all went fine, else 'false'
        */
        PLMESH_API bool CalculateJointBoundingBox(PLMath::AABoundingBox &cAAB) const;

        /**
        *  @brief
        *    Returns the current used vertex buffer of the mesh
        *
        *  @return
        *    Current used vertex buffer of the mesh, can be a null pointer
        *
        *  @note
        *    - You shouldn't manipulate this vertex buffer - use it for read only!
        *      Internally the mesh handler will use the meshes vertex buffer directly
        *      whenever possible, but if there are e.g. animations the mesh handler has
        *      it's own vertex buffer with the current individual data.
        *
        *  @see
        *    - Update()
        */
        PLMESH_API PLRenderer::VertexBuffer *GetVertexBuffer() const;

        /**
        *  @brief
        *    Returns the total number of current triangles
        *
        *  @return
        *    Total number of current triangles
        */
        PLMESH_API PLCore::uint32 GetNumOfTriangles() const;

        /**
        *  @brief
        *    Returns the first mesh triangle intersecting the line
        *
        *  @param[in]  vLineStartPos
        *    Line start position
        *  @param[in]  vLineEndPos
        *    Line end position
        *  @param[out] nTriangle
        *    Will receive the ID of the found triangle
        *  @param[out] pnGeometry
        *    Receives the owner geometry ID of the found triangle if not a null pointer
        *  @param[out] pvCollisionPoint
        *    Will receive the collision point if not a null pointer
        *  @param[in]  plstGeometries
        *    List of geometry indices to use, if a null pointer all geometries are used
        *
        *  @return
        *    'true' if a triangle was found, else 'false'
        *
        *  @note
        *    - The line is assumed to be in the object space of the mesh handlers mesh
        */
        PLMESH_API bool FindTriangle(const PLMath::Vector3 &vLineStartPos,
                                     const PLMath::Vector3 &vLineEndPos,
                                     PLCore::uint32 &nTriangle, PLCore::uint32 *pnGeometry = nullptr,
                                     PLMath::Vector3 *pvCollisionPoint = nullptr, PLCore::Array<PLCore::uint32> *plstGeometries = nullptr) const;

        /**
        *  @brief
        *    Returns a list of mesh geometries intersecting the plane set
        *
        *  @param[in]  cPlaneSet
        *    Plane set we want to check against
        *  @param[out] ppnGeometries
        *    If not a null pointer, receives the geometries intersecting the plane set.
        *    You have to delete this list by self after usage! (delete [] ...)
        *  @param[in]  pvCamDir
        *    Camera direction vector, if not null faces where the normal is
        *    facing away from the given camera direction are ignored
        *
        *  @return
        *    Number of found geometries if all went fine, else 0
        *
        *  @note
        *    - The the planes must be in the object space
        */
        PLMESH_API PLCore::uint32 FindGeometries(const PLMath::PlaneSet &cPlaneSet, PLCore::uint32 **ppnGeometries = nullptr, PLMath::Vector3 *pvCamDir = nullptr) const;

        /**
        *  @brief
        *    Gets the triangle list
        *
        *  @return
        *    Triangle list, a null pointer on error
        *
        *  @see
        *    - MeshLODLevel::BuildTriangleList()
        */
        PLMESH_API PLCore::Array<MeshTriangle> *GetTriangleList();

        /**
        *  @brief
        *    Gets the edge list
        *
        *  @return
        *    Edge list, a null pointer on error
        *
        *  @see
        *    - MeshLODLevel::BuildEdgeList()
        */
        PLMESH_API PLCore::Array<MeshEdge> *GetEdgeList();

        /**
        *  @brief
        *    Builds the current triangle planes
        *
        *  @note
        *    - The triangle planes must be updated after manipulating
        *      geometries or vertices!
        *    - If the triangle list is available (MeshLODLevel::GetTriangleList())
        *      it will be used for faster triangle plane calculation, else the slower
        *      GetTriangle() is used instead.
        */
        PLMESH_API void BuildTrianglePlaneList();

        /**
        *  @brief
        *    Gets the triangle plane list
        *
        *  @return
        *    Triangle plane list, a null pointer on error
        *
        *  @note
        *    - If the mesh handler currently is using the original morph target vertex
        *      data the triangle planes of this morph target will be returned. But
        *      if the mesh handler is using an animated mesh it will need it's individual
        *      triangle planes!
        *
        *  @see
        *    - See BuildTrianglePlaneList()
        */
        PLMESH_API PLCore::Array<PLMath::Plane> *GetTrianglePlaneList();


    //[-------------------------------------------------------]
    //[ Private functions                                     ]
    //[-------------------------------------------------------]
    private:
        /**
        *  @brief
        *    Clears all materials
        */
        void ClearMaterials();

        /**
        *  @brief
        *    Adds a new material
        *
        *  @param[in] pMaterial
        *    Material to add, can be a null pointer
        *
        *  @return
        *    Pointer to the added material, a null pointer on error
        */
        PLRenderer::Material *AddMaterial(PLRenderer::Material *pMaterial);

        /**
        *  @brief
        *    Called when the frame of an animation manager animation has been changed
        */
        void OnAnimationFrameChange();


    //[-------------------------------------------------------]
    //[ Private event handlers                                ]
    //[-------------------------------------------------------]
    private:
        PLCore::EventHandler<> EventHandlerAnimationFrameChange;


    //[-------------------------------------------------------]
    //[ Private data                                          ]
    //[-------------------------------------------------------]
    private:
        PLRenderer::Renderer                        *m_pRenderer;       /**< Used renderer, can be a null pointer */
        Mesh                                        *m_pMesh;           /**< Used mesh, can be a null pointer */
        PLCore::Array<PLRenderer::MaterialHandler*>  m_lstMaterials;    /**< Materials */
        PLRenderer::VertexBuffer                    *m_pVertexBuffer;   /**< Mesh handler own vertex buffer (optional, can be a null pointer) */

        // Current stuff
        bool                      m_bMeshUpdateRequired;        /**< Mesh update required */
        PLCore::uint32            m_nLOD;                       /**< Current LOD level */
        PLRenderer::VertexBuffer *m_pCurrentVertexBuffer;       /**< Current vertex buffer to use, can be a null pointer */
        PLCore::Bitset            m_cGeometryVisibility;        /**< Holds which geometry is visible and which not */
        PLCore::Array<float>      m_lstBaseMorphTargetWeights;  /**< Morph target base weights */
        PLCore::Array<float>      m_lstMorphTargetWeights;      /**< Current morph target weights */
        SkeletonHandler          *m_pSkeletonHandler;           /**< Skeleton handler, can be a null pointer */
        MeshAnimationManager     *m_pMeshAnimationManager;      /**< Mesh animation manager, can be a null pointer */

        // Precalculated data
        bool                         m_bRecalculateTrianglePlanes;  /**< Do we need to recalculate the triangle planes? */
        PLCore::Array<PLMath::Plane> m_lstTrianglePlanes;           /**< List of triangle planes */


};


//[-------------------------------------------------------]
//[ Namespace                                             ]
//[-------------------------------------------------------]
} // PLMesh


#endif // __PLMESH_MESHHANDLER_H__