source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/Material.h @ 3045

#ifndef __MATERIAL_H
#define __MATERIAL_H

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


namespace CHCDemoEngine 
{

class Texture;
class RenderState;
class GPUProgramParameters;
class ShaderProgram;


/** Class representing an rgba color vector.
*/
class RgbaColor 
{

public:

        RgbaColor(): r(1), g(1), b(1), a(1)
        {}

        RgbaColor(float _r, float _g, float _b, float _a): r(_r), g(_g), b(_b), a(_a)
        {}

        friend RgbaColor RandomColor(float a = 0.0f, float b = 1.0f);


        /////////////////////

        float r, g, b, a;
};


// Forward declarations
RgbaColor RandomColor(float a, float b);


/** This class represents a certain rendering technique of a shape.
        A material consists of one or more techniques
*/
class Technique 
{
friend class ResourceManager;

public:

        /** Sets default material (ambient intensity 0.2f, diffuse intensity 1.0f)
        */
        Technique();

        Technique(const Technique &tech);

        ~Technique();
        /** Sets ambient and diffuse color to color
        */
        Technique(const RgbaColor &color);

        inline Texture *GetTexture() const { return mTexture; }

        inline RgbaColor GetAmbient() const { return mAmbientColor; }
        inline RgbaColor GetDiffuse() const { return mDiffuseColor; }
        inline RgbaColor GetSpecular() const { return mSpecularColor; }
        inline RgbaColor GetEmmisive() const { return mEmmisiveColor; }

        inline void SetTexture(Texture *texture) { mTexture = texture; }

        inline void SetAmbient(const RgbaColor &color) { mAmbientColor = color; }
        inline void SetDiffuse(const RgbaColor &color) { mDiffuseColor = color; }
        inline void SetSpecular(const RgbaColor &color) { mSpecularColor = color; }
        inline void SetEmmisive(const RgbaColor &color) { mEmmisiveColor = color; }
        
        inline void SetAlphaTestEnabled(bool alpha) { mAlphaTestEnabled = alpha; }
        inline void SetCullFaceEnabled(bool cull) { mCullFaceEnabled = cull; }

        inline bool IsAlphaTestEnabled() const { return mAlphaTestEnabled; } 
        inline bool IsCullFaceEnabled() const { return mCullFaceEnabled; } 
        /** Renders this technique.
        */
        void Render(RenderState *state);
        /** Initialize the material with default values
        */
        void InitMaterial();

        void SetFragmentProgram(ShaderProgram *p);
        void SetVertexProgram(ShaderProgram *p);

        ShaderProgram *GetFragmentProgram() { return mFragmentProgram; }
        ShaderProgram *GetVertexProgram() { return mVertexProgram; }

        //void SetFragmentProgramParameters(const GPUProgramParameters &p) { mGPUFragmentParameters = p; }
        //void SetVertexProgramParameters(const GPUProgramParameters &p) { mGPUVertexParameters = p; }

        /** Each technique has a distict set of parameters.
        */
        GPUProgramParameters * const GetFragmentProgramParameters() { return &mFragmentProgramParameters; }
        GPUProgramParameters * const GetVertexProgramParameters() { return &mVertexProgramParameters; }


protected:

        ///////////

        RgbaColor mDiffuseColor;
        RgbaColor mSpecularColor;
        RgbaColor mAmbientColor;
        RgbaColor mEmmisiveColor;

        bool mAlphaTestEnabled;
        bool mCullFaceEnabled;
        /// the associated texture
        Texture *mTexture;

        GPUProgramParameters mVertexProgramParameters;
        GPUProgramParameters mFragmentProgramParameters;

        ShaderProgram *mFragmentProgram;
        ShaderProgram *mVertexProgram;
};


/** A material consists of one or more techniques.
*/
class Material
{
public:
        /** Default constructor creating one default technique.
        */
        Material();

        ~Material();
        /** Renders this material.
        */
        void Render(RenderState *state);

        void AddTechnique(Technique *t);

        Technique *GetDefaultTechnique() const;

        Technique *GetTechnique(int i) const;

        int GetNumTechniques() const;



protected:

        TechniqueContainer mTechniques;
};

}

#endif