OgreShaderFFPFog.h

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/*
-----------------------------------------------------------------------------
This source file is part of OGRE
(Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org

Copyright (c) 2000-2014 Torus Knot Software Ltd
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
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The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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THE SOFTWARE.
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*/
#ifndef _ShaderFFPFog_
#define _ShaderFFPFog_

#include "OgreShaderPrerequisites.h"
#ifdef RTSHADER_SYSTEM_BUILD_CORE_SHADERS
#include "OgreShaderParameter.h"
#include "OgreShaderSubRenderState.h"
#include "OgreVector4.h"

namespace Ogre {
namespace RTShader {

class _OgreRTSSExport FFPFog : public SubRenderState
{
public:

    // Fog calculation mode enum.
    enum CalcMode
    {
        CM_PER_VERTEX   = 1,        // Per vertex fog calculations. (Default).
        CM_PER_PIXEL    = 2         // Per pixel fog calculations.
    };

// Interface.
public:

    FFPFog();

    virtual const String& getType() const;

    virtual int getExecutionOrder() const;

    virtual void updateGpuProgramsParams(Renderable* rend, Pass* pass, const AutoParamDataSource* source, const LightList* pLightList);

    virtual void copyFrom(const SubRenderState& rhs);

    virtual bool preAddToRenderState(const RenderState* renderState, Pass* srcPass, Pass* dstPass);

    void setFogProperties(FogMode fogMode, 
        const ColourValue& fogColour, 
        float fogStart, 
        float fogEnd, 
        float fogDensity);

    void setCalcMode(CalcMode calcMode) { mCalcMode = calcMode; }

    CalcMode getCalcMode() const { return mCalcMode; }

    static String Type;

// Protected methods
protected:

    virtual bool resolveParameters(ProgramSet* programSet);

    virtual bool resolveDependencies(ProgramSet* programSet);

    virtual bool addFunctionInvocations(ProgramSet* programSet);

// Attributes.
protected:  
    // Fog calculation mode.
    CalcMode mCalcMode;
    // Fog formula. 
    FogMode mFogMode;
    // Fog colour value.
    ColourValue mFogColourValue;
    // Fog parameters (density, start, end, 1/end-start).
    Vector4 mFogParamsValue;
    // True if the fog parameters should be taken from the pass.
    bool mPassOverrideParams;

    // World view projection parameter.     
    UniformParameterPtr mWorldViewProjMatrix;
    // Fog colour parameter.    
    UniformParameterPtr mFogColour;
    // Fog parameters program parameter.    
    UniformParameterPtr mFogParams;
    // Vertex shader input position parameter.
    ParameterPtr mVSInPos;
    // Vertex shader output fog colour parameter.
    ParameterPtr mVSOutFogFactor;
    // Pixel shader input fog factor.
    ParameterPtr mPSInFogFactor;
    // Vertex shader output depth.
    ParameterPtr mVSOutDepth;
    // Pixel shader input depth.
    ParameterPtr mPSInDepth;
    // Pixel shader output diffuse colour.
    ParameterPtr mPSOutDiffuse;
};


class _OgreRTSSExport FFPFogFactory : public SubRenderStateFactory
{
public:

    virtual const String& getType() const;

    virtual SubRenderState* createInstance(ScriptCompiler* compiler, PropertyAbstractNode* prop, Pass* pass, SGScriptTranslator* translator);

    virtual void writeInstance(MaterialSerializer* ser, SubRenderState* subRenderState, Pass* srcPass, Pass* dstPass);

    
protected:

    virtual SubRenderState* createInstanceImpl();


};

}
}

#endif
#endif