source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/SkyPreetham.h @ 3021

#ifndef _SKYPREETHAM_H__
#define _SKYPREETHAM_H__

#include "glInterface.h"
#include "common.h"
#include "ShaderProgram.h"

#include <Cg/cg.h>
#include <Cg/cgGL.h>


namespace CHCDemoEngine {
        class Vector3;
        class SceneEntity;
        class RenderState;
        class Camera;
}

class SkyPreetham
{
public:
        /// Constructor taking sky turbitity as parameter and the sky dome geometry
        SkyPreetham(float turbitity, CHCDemoEngine::SceneEntity *skyDome);
        
        ~SkyPreetham();

        void RenderSkyDome(const CHCDemoEngine::Vector3 &sunDir, 
                               CHCDemoEngine::Camera *camera, 
                                           CHCDemoEngine::RenderState *state, 
                                           bool scaleToRange);

        void ComputeFactors(const CHCDemoEngine::Vector3 &sunDir, 
                                CHCDemoEngine::Vector3 &zenithColor, 
                                                std::vector<CHCDemoEngine::Vector3> &ABCDE, 
                                                std::pair<float, float> &sunThetha) const;

        void ComputeSunColor(const CHCDemoEngine::Vector3 &sunDir, 
                                 CHCDemoEngine::Vector3 &ambient, 
                                                 CHCDemoEngine::Vector3 &diffuse,
                                                 bool scaleToRange) const;

        static void InitCG(CGcontext context);
        static void ReleaseCG();


protected:

        void RenderSunDisk(const CHCDemoEngine::Vector3 &lightDir, CHCDemoEngine::Camera *camera);
        void CreateSunQuad();


        /// Members.
/*      FEffect*                mEffect;

        FEffect*                mSunEffect;
        FTexture2D*             mSunTexture;
        FVertexBuffer*  mSunQuad;
*/
        CHCDemoEngine::SceneEntity *mSkyDome;

        float mTurbidity;

        static CHCDemoEngine::ShaderContainer sShaders;
};

#endif //_SKYPREETHAM_H__