components/terrain/world.hpp

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#ifndef COMPONENTS_TERRAIN_H
#define COMPONENTS_TERRAIN_H

#include <OgreHardwareIndexBuffer.h>
#include <OgreHardwareVertexBuffer.h>
#include <OgreAxisAlignedBox.h>
#include <OgreTexture.h>

namespace Loading
{
    class Listener;
}

namespace Ogre
{
    class Camera;
}

namespace Terrain
{

    class QuadTreeNode;
    class Storage;

    class World
    {
    public:
        World(Loading::Listener* loadingListener, Ogre::SceneManager* sceneMgr,
                Storage* storage, int visiblityFlags, bool distantLand, bool shaders);
        ~World();

        void setLoadingListener(Loading::Listener* loadingListener) { mLoadingListener = loadingListener; }

        bool getDistantLandEnabled() { return mDistantLand; }
        bool getShadersEnabled() { return mShaders; }
        bool getShadowsEnabled() { return mShadows; }
        bool getSplitShadowsEnabled() { return mSplitShadows; }

        float getHeightAt (const Ogre::Vector3& worldPos);

        void update (const Ogre::Vector3& cameraPos);

        Ogre::AxisAlignedBox getWorldBoundingBox (const Ogre::Vector2& center);

        Ogre::SceneManager* getSceneManager() { return mSceneMgr; }

        Ogre::SceneNode* getRootSceneNode() { return mRootSceneNode; }

        Storage* getStorage() { return mStorage; }

        void setVisible(bool visible);
        bool getVisible();

        void applyMaterials(bool shadows, bool splitShadows);

        int getVisiblityFlags() { return mVisibilityFlags; }

        int getMaxBatchSize() { return mMaxBatchSize; }

        void enableSplattingShader(bool enabled);

    private:
        bool mDistantLand;
        bool mShaders;
        bool mShadows;
        bool mSplitShadows;
        bool mVisible;

        Loading::Listener* mLoadingListener;

        QuadTreeNode* mRootNode;
        Ogre::SceneNode* mRootSceneNode;
        Storage* mStorage;

        int mVisibilityFlags;

        Ogre::SceneManager* mSceneMgr;
        Ogre::SceneManager* mCompositeMapSceneMgr;

        Ogre::AxisAlignedBox mBounds;

        float mMinBatchSize;
        float mMaxBatchSize;

        void buildQuadTree(QuadTreeNode* node);

    public:
        // ----INTERNAL----

        enum IndexBufferFlags
        {
            IBF_North = 1 << 0,
            IBF_East  = 1 << 1,
            IBF_South = 1 << 2,
            IBF_West  = 1 << 3
        };

        Ogre::HardwareIndexBufferSharedPtr getIndexBuffer (int flags, size_t& numIndices);

        Ogre::HardwareVertexBufferSharedPtr getVertexBuffer (int numVertsOneSide);

        Ogre::SceneManager* getCompositeMapSceneManager() { return mCompositeMapSceneMgr; }

        // Delete all quads
        void clearCompositeMapSceneManager();
        void renderCompositeMap (Ogre::TexturePtr target);

    private:
        // Index buffers are shared across terrain batches where possible. There is one index buffer for each
        // combination of LOD deltas and index buffer LOD we may need.
        std::map<int, Ogre::HardwareIndexBufferSharedPtr> mIndexBufferMap;

        std::map<int, Ogre::HardwareVertexBufferSharedPtr> mUvBufferMap;

        Ogre::RenderTarget* mCompositeMapRenderTarget;
        Ogre::TexturePtr mCompositeMapRenderTexture;
    };

}

#endif