/*!
 * @file mapped_water.h
 *  worldentity for flat, cool looking, mapped water
*/
/*! example input in .oxw file with the standard values
<MappedWater>
  <waterpos>0,0,0</waterpos>
  <watersize>100,100</watersize>
  <wateruv>9</wateruv><!-- size of the waves -->
  <waterflow>0.08</waterflow>
  <lightpos>0,10,0</lightpos>
  <waterangle>0</waterangle>
  <normalmapscale>0.25</normalmapscale><!-- you won't see a big differnce if you change that -->
</MappedWater>
*/


#ifndef _MAPPED_WATER_H
#define _MAPPED_WATER_H

#include "world_entity.h"
#include "material.h"
#include "shader.h"


class MappedWater : public WorldEntity
{
  public:
    MappedWater(const TiXmlElement* root = NULL);
    virtual ~MappedWater();

    void loadParams(const TiXmlElement* root);

    void draw() const;
    void tick(float dt);

    // function to prepare renderpaths for creation of refleaction and reflaction textures
    void activateReflection();
    void deactivateReflection();
    void activateRefraction();
    void deactivateRefraction();

    // functions to set parameters for the water, usually they're called through loadparam
    void setLightPos(float x, float y, float z) { this->lightPos = Vector(x,y,z); };
    void setWaterPos(float x, float y, float z) { this->waterPos = Vector(x,y,z); };
    void setWaterSize(float x, float z) { this->xWidth = x; this->zWidth = z; };
    void setWaterAngle(float angle) { this->waterAngle = angle; };
    void setWaterUV(float uv) { this->waterUV = uv; };
    void setWaterFlow(float flow) { this->waterFlow = flow; };
    void setNormalMapScale(float scale) { this->kNormalMapScale = scale; };

  private:
    void initParams();
    void initTextures();
    void initShaders();

  private:
    Vector              waterPos;               //!< position of the water
    float               xWidth, zWidth;         //!< size of the water quad
    Vector              lightPos;               //!< position of the light that is used to render the reflection
    float               waterAngle;             //!< defines how much the water will be turned around the point waterPos

    float               move;                   //!< textures coords, speeds, positions for the shaded textures....
    float               move2;
    float               waterUV;                //!< size of the waves
    float               waterFlow;              //!< speed of the water
    float               normalUV;
    float               kNormalMapScale;

    int                 textureSize;            //!< height and width of the texture
    Material            mat;
    Shader*             shader;
    Shader::Uniform*    cam_uni;                //!< uniform that is used for the camera position
};

#endif