RainCloseDropsParticles.h

//
//              Realistic rain real-time simulation program
//
//              Pierre Rousseau
//
//
//              Particle systems handling
//

#ifndef __RAIN_CLOSE_DROPS_PARTICLES__
#define __RAIN_CLOSE_DROPS_PARTICLES__


#include "CommonRain.h"
#include "RainTextureFrameListener.h"
#include "RainManualHardwareBillboardMeshLoader.h"
#include "RainLight.h"






class CloseDropsParticles
{
private :
    SceneManager *mSceneMgr;
    RainLightManager *mRainLightMgr;
    SceneNode *mParticlesNode, *mParentCam, *mParentSyst;

    // wide angle camera used to render the drops
    Ogre::Camera *mCamera;
    RenderTexture *dropsTexture;
    MaterialPtr dropsTexturesMaterial;

    // simulation textures, containing particle positions
    int mActiveParticlesCount;
    RenderTexture *particlePosTexture, *particlePosTextureBackup;

    BillboardSet *bbSet1, *bbSet2; // billboardsets for ping-pong position textures


public :
    float mRainWidth;
    float mRainStreaksHeight;


    CloseDropsParticles(SceneManager *sceneMgr, SceneNode *parentSyst, SceneNode *parentCam);

    ~CloseDropsParticles();

    void createLights();

    RainLightManager *getLightManagerPtr();

    void updateLights();

    void definePosTextureAndBackup();

    void makeControlOverlay();

    void updatePositionTexture(bool primary);

    void updateFragmentProgramParameter(const String &name, float value);
    void updateFragmentProgramParameter(const String &name, Ogre::Vector3 value);
    void updateFragmentProgramParameter(const String &name, Ogre::Vector4 value);
    void updateShaderParameters(float tslf, float rainBbSide, float streaksHeight, int nbLights,
                                Vector3 viewPos, Vector3 viewDir, Vector3 fallVect, Vector3 boxMin, Vector3 boxMax, Vector3 lastMove, Vector3 randomMove, int useShader);


    void updateTimeSinceLastFrame(float tslf);
    void updateRainBilboardSideLength(float rainBbSide);
    void updateStreaksHeight(float streaksHeight);
    void updateLightCount(float nbLights);
    void updateViewPos(Vector3 viewPos);
    void updateViewDir(Vector3 viewDir);
    void updateFallVector(Vector3 fallVect);
    void updateBoxMin(Vector3 boxMin);
    void updateBoxMax(Vector3 boxMax);
    void updateLastMove(Vector3 lastMove);
    void updateRandomMove(Vector3 randomMove);

    void hidePositionBillboards()
    {
        bbSet1->setVisible(false);
        bbSet2->setVisible(false);
    }
    void showPositionBillboards()
    {
        bbSet1->setVisible(true);
        bbSet2->setVisible(true);
    }

private :

    void createMaterial(String name);

    Camera* createDropsCamera();

    void GPUmaterial();
    
    void initializeBillboardsPositionTexture();
    
    MeshPtr createHardwareBillboardMesh(String materialName, String meshName=BILLBOARD_MESH_NAME);

    void modifyClonedHardwareBillboardMesh(MeshPtr msh, int partNumber);

    void initParticles();
    
    void createBillboardsPositionRenderTexture(RenderTexture *PSPosTexture, Vector3 nodePos, BillboardSet *bbSet);

    void createBillboardsPositionTextureMaterial(String inputTextureName);
};




#endif // __RAIN_CLOSE_DROPS_PARTICLES__

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