urho3d/Engine/Graphics/StaticModel.h

//
// Urho3D Engine
// Copyright (c) 2008-2012 Lasse Öörni
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

#pragma once

#include "Drawable.h"

class Model;

/// Static model per-batch data.
struct StaticModelBatch
{
    /// Current distance.
    float distance_;
    /// Current LOD geometry.
    Geometry* geometry_;
    /// Material.
    SharedPtr<Material> material_;
    /// Current LOD level.
    unsigned lodLevel_;
    /// Geometry center.
    Vector3 center_;
};

/// Static model component.
class StaticModel : public Drawable
{
    OBJECT(StaticModel);
    
public:
    /// Construct.
    StaticModel(Context* context);
    /// Destruct.
    ~StaticModel();
    /// Register object factory. Drawable must be registered first.
    static void RegisterObject(Context* context);
    
    /// Process octree raycast. May be called from a worker thread.
    virtual void ProcessRayQuery(const RayOctreeQuery& query, PODVector<RayQueryResult>& results);
    /// Calculate distance and LOD level for rendering. May be called from worker thread(s), possibly re-entrantly.
    virtual void UpdateDistance(const FrameInfo& frame);
    /// Return number of batches.
    virtual unsigned GetNumBatches();
    /// Fill rendering batch with distance, geometry, material and world transform.
    virtual void GetBatch(Batch& batch, const FrameInfo& frame, unsigned batchIndex);
    /// Return number of occlusion geometry triangles.
    virtual unsigned GetNumOccluderTriangles();
    /// Draw to occlusion buffer. Return true if did not run out of triangles.
    virtual bool DrawOcclusion(OcclusionBuffer* buffer);
    
    /// %Set model.
    void SetModel(Model* model);
    /// %Set material on all geometries.
    void SetMaterial(Material* material);
    /// %Set material on one geometry. Return true if successful.
    bool SetMaterial(unsigned index, Material* material);
    /// %Set software LOD level, used in raycast and occlusion. By default (M_MAX_UNSIGNED) same as visible.
    void SetSoftwareLodLevel(unsigned level);
    
    /// Return model.
    Model* GetModel() const { return model_; }
    /// Return model's bounding box.
    const BoundingBox& GetBoundingBox() const { return boundingBox_; }
    /// Return number of geometries.
    unsigned GetNumGeometries() const { return geometries_.Size(); }
    /// Return material by geometry index.
    Material* GetMaterial(unsigned index) const;
    /// Return software LOD level.
    unsigned GetSoftwareLodLevel() const { return softwareLodLevel_; }
    
    /// %Set model attribute.
    void SetModelAttr(ResourceRef value);
    /// %Set materials attribute.
    void SetMaterialsAttr(const ResourceRefList& value);
    /// Return model attribute.
    ResourceRef GetModelAttr() const;
    /// Return materials attribute.
    const ResourceRefList& GetMaterialsAttr() const;
    
protected:
    /// Recalculate the world-space bounding box.
    virtual void OnWorldBoundingBoxUpdate();
    /// %Set the bounding box.
    void SetBoundingBox(const BoundingBox& box);
    /// %Set number of geometries.
    void SetNumGeometries(unsigned num);
    /// Reset LOD levels.
    void ResetLodLevels();
    /// Choose LOD levels based on distance.
    void CalculateLodLevels();
    
    /// Per-batch data.
    Vector<StaticModelBatch> batches_;
    /// Bounding box.
    BoundingBox boundingBox_;
    /// All geometries.
    Vector<Vector<SharedPtr<Geometry> > > geometries_;
    /// Model.
    SharedPtr<Model> model_;
    /// Software LOD level, used in raycasting and occlusion.
    unsigned softwareLodLevel_;
    /// Material list attribute.
    mutable ResourceRefList materialsAttr_;
    
private:
    /// Handle model reload finished.
    void HandleModelReloadFinished(StringHash eventType, VariantMap& eventData);
};