Model.h

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/* Copyright (C) 2022 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
 * Mesh object with texture and skinning information
 */

#ifndef INCLUDED_MODEL
#define INCLUDED_MODEL

#include "graphics/Material.h"
#include "graphics/MeshManager.h"
#include "graphics/ModelAbstract.h"

#include <vector>

struct SPropPoint;
class CObjectEntry;
class CSkeletonAnim;
class CSkeletonAnimDef;
class CSimulation2;

#define MODELFLAG_CASTSHADOWS       (1<<0)
#define MODELFLAG_NOLOOPANIMATION   (1<<1)
#define MODELFLAG_SILHOUETTE_DISPLAY    (1<<2)
#define MODELFLAG_SILHOUETTE_OCCLUDER   (1<<3)
#define MODELFLAG_IGNORE_LOS        (1<<4)
#define MODELFLAG_FLOATONWATER      (1<<5)
///////////////////////////////////////////////////////////////////////////////
// CModel: basically, a mesh object - holds the texturing and skinning
// information for a model in game
class CModel : public CModelAbstract
{
    NONCOPYABLE(CModel);

public:
    struct Prop
    {
        Prop() : m_MinHeight(0.f), m_MaxHeight(0.f), m_Point(0), m_Model(0), m_ObjectEntry(0), m_Hidden(false), m_Selectable(true) {}

        float m_MinHeight;
        float m_MaxHeight;

        /**
         * Location of the prop point within its parent model, relative to either a bone in the parent model or to the
         * parent model's origin. See the documentation for @ref SPropPoint for more details.
         * @see SPropPoint
         */
        const SPropPoint* m_Point;

        /**
         * Pointer to the model associated with this prop. Note that the transform matrix held by this model is the full object-to-world
         * space transform, taking into account all parent model positioning (see @ref CModel::ValidatePosition for positioning logic).
         * @see CModel::ValidatePosition
         */
        CModelAbstract* m_Model;
        CObjectEntry* m_ObjectEntry;

        bool m_Hidden; ///< Should this prop be temporarily removed from rendering?
        bool m_Selectable; /// < should this prop count in the selection size?
    };

public:
    // constructor
    CModel(CSimulation2& simulation);
    // destructor
    ~CModel();


    /// Dynamic cast
    virtual CModel* ToCModel()
    {
        return this;
    }

    // setup model from given geometry
    bool InitModel(const CModelDefPtr& modeldef);
    // update this model's state; 'time' is the absolute time since the start of the animation, in MS
    void UpdateTo(float time);

    // get the model's geometry data
    const CModelDefPtr& GetModelDef() { return m_pModelDef; }

    // set the model's material
    void SetMaterial(const CMaterial &material);
    // set the model's player ID, recursively through props
    void SetPlayerID(player_id_t id);
    // set the models mod color
    virtual void SetShadingColor(const CColor& color);
    // get the model's material
    CMaterial& GetMaterial() { return m_Material; }

    // set the given animation as the current animation on this model
    bool SetAnimation(CSkeletonAnim* anim, bool once = false);

    // get the currently playing animation, if any
    CSkeletonAnim* GetAnimation() const { return m_Anim; }

    // set the animation state to be the same as from another; both models should
    // be compatible types (same type of skeleton)
    void CopyAnimationFrom(CModel* source);

    // set object flags
    void SetFlags(int flags) { m_Flags=flags; }
    // get object flags
    int GetFlags() const { return m_Flags; }
    // add object flags, recursively through props
    void AddFlagsRec(int flags);
    // remove shadow casting and receiving, recursively through props
    // TODO: replace with more generic shader define + flags setting
    void RemoveShadowsRec();

    virtual void SetTerrainDirty(ssize_t i0, ssize_t j0, ssize_t i1, ssize_t j1)
    {
        for (size_t i = 0; i < m_Props.size(); ++i)
            m_Props[i].m_Model->SetTerrainDirty(i0, j0, i1, j1);
    }

    virtual void SetEntityVariable(const std::string& name, float value)
    {
        for (size_t i = 0; i < m_Props.size(); ++i)
            m_Props[i].m_Model->SetEntityVariable(name, value);
    }

    // --- WORLD/OBJECT SPACE BOUNDS -----------------------------------------------------------------

    /// Overridden to calculate both the world-space and object-space bounds of this model, and stores the result in
    /// m_Bounds and m_ObjectBounds, respectively.
    virtual void CalcBounds();

    /// Returns the object-space bounds for this model, excluding its children.
    const CBoundingBoxAligned& GetObjectBounds()
    {
        RecalculateBoundsIfNecessary();             // recalculates both object-space and world-space bounds if necessary
        return m_ObjectBounds;
    }

    virtual const CBoundingBoxAligned GetWorldBoundsRec();      // reimplemented here

    /// Auxiliary method; calculates object space bounds of this model, based solely on vertex positions, and stores
    /// the result in m_ObjectBounds. Called by CalcBounds (instead of CalcAnimatedObjectBounds) if it has been determined
    /// that the object-space bounds are static.
    void CalcStaticObjectBounds();

    /// Auxiliary method; calculate object-space bounds encompassing all vertex positions for given animation, and stores
    /// the result in m_ObjectBounds. Called by CalcBounds (instead of CalcStaticBounds) if it has been determined that the
    /// object-space bounds need to take animations into account.
    void CalcAnimatedObjectBounds(CSkeletonAnimDef* anim,CBoundingBoxAligned& result);

    // --- SELECTION BOX/BOUNDS ----------------------------------------------------------------------

    /// Reimplemented here since proper models should participate in selection boxes.
    virtual const CBoundingBoxAligned GetObjectSelectionBoundsRec();

    /**
     * Set transform of this object.
     *
     * @note In order to ensure that all child props are updated properly,
     * you must call ValidatePosition().
     */
    virtual void SetTransform(const CMatrix3D& transform);

    /**
     * Return whether this is a skinned/skeletal model. If it is, Get*BoneMatrices()
     * will return valid non-NULL arrays.
     */
    bool IsSkinned() { return (m_BoneMatrices != NULL); }

    // return the models bone matrices; 16-byte aligned for SSE reads
    const CMatrix3D* GetAnimatedBoneMatrices() {
        ENSURE(m_PositionValid);
        return m_BoneMatrices;
    }

    /**
     * Add a prop to the model on the given point.
     */
    void AddProp(const SPropPoint* point, CModelAbstract* model, CObjectEntry* objectentry, float minHeight = 0.f, float maxHeight = 0.f, bool selectable = true);

    /**
     * Add a prop to the model on the given point, and treat it as the ammo prop.
     * The prop will be hidden by default.
     */
    void AddAmmoProp(const SPropPoint* point, CModelAbstract* model, CObjectEntry* objectentry);

    /**
     * Show the ammo prop (if any), and hide any other props on that prop point.
     */
    void ShowAmmoProp();

    /**
     * Hide the ammo prop (if any), and show any other props on that prop point.
     */
    void HideAmmoProp();

    /**
     * Find the first prop used for ammo, by this model or its own props.
     */
    CModelAbstract* FindFirstAmmoProp();

    // return prop list
    std::vector<Prop>& GetProps() { return m_Props; }
    const std::vector<Prop>& GetProps() const { return m_Props; }

    // return a clone of this model
    virtual CModelAbstract* Clone() const;

    /**
     * Ensure that both the transformation and the bone
     * matrices are correct for this model and all its props.
     */
    virtual void ValidatePosition();

    /**
     * Mark this model's position and bone matrices,
     * and all props' positions as invalid.
     */
    virtual void InvalidatePosition();

private:
    // delete anything allocated by the model
    void ReleaseData();

    // Needed for terrain aligned props
    CSimulation2& m_Simulation;

    // object flags
    int m_Flags;
    // model's material
    CMaterial m_Material;
    // pointer to the model's raw 3d data
    CModelDefPtr m_pModelDef;
    // object space bounds of model - accounts for bounds of all possible animations
    // that can play on a model. Not always up-to-date - currently CalcBounds()
    // updates it when necessary.
    CBoundingBoxAligned m_ObjectBounds;
    // animation currently playing on this model, if any
    CSkeletonAnim* m_Anim;
    // time (in MS) into the current animation
    float m_AnimTime;

    /**
     * Current state of all bones on this model; null if associated modeldef isn't skeletal.
     * Props may attach to these bones by means of the SPropPoint::m_BoneIndex field; in this case their
     * transformation matrix held is relative to the bone transformation (see @ref SPropPoint and
     * @ref CModel::ValidatePosition).
     *
     * @see SPropPoint
     */
    CMatrix3D* m_BoneMatrices;
    // list of current props on model
    std::vector<Prop> m_Props;

    /**
     * The prop point to which the ammo prop is attached, or NULL if none
     */
    const SPropPoint* m_AmmoPropPoint;

    /**
     * If m_AmmoPropPoint is not NULL, then the index in m_Props of the ammo prop
     */
    size_t m_AmmoLoadedProp;
};

#endif