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//Shader code by Mark Blosser
//WEBSITE:  www.hyrumark.com
//EMAIL:  [email protected]

//Description:  Shader for SEGMENTS in FPSC. Uses normal mapping and specular, combined with lightmap texture auto-generated from FPS Creator.

//Textures: 
//"texture_D.dds"      diffuse texture
//"texture_I.dd"       specular texture
//"texture_N.dds"       normal map texture
/************* UNTWEAKABLES **************/

float4x4 World      : WORLD;

float4x4 WorldViewProj : WorldViewProjection;
float4x4 WorldIT : WorldInverseTranspose;
float4x4 ViewInv : ViewInverse;
float4 eyePos : CameraPosition;
float4x4 WorldInv : WorldInverse;



/******TWEAKABLES***************************/




float LightHeight : Power
<
    string UIWidget = "slider";
    float UIMin = -100.0;
    float UIMax = 200.0;
    float UIStep = 10;
    string UIName =  "specular power";
> = 20.0;

float SpecAmount : Power
<
    string UIWidget = "slider";
    float UIMin = 0.0;
    float UIMax = 2.0;
    float UIStep = 0.1;
    string UIName =  "specular power";
> = 1.4;

float Glossiness : Power
<
    string UIWidget = "slider";
    float UIMin = 1.0;
    float UIMax = 128.0;
    float UIStep = 1;
    string UIName =  "Glossiness";
> = 24.0;

float BumpIntensity : Power
<
    string UIWidget = "slider";
    float UIMin = -2.0;
    float UIMax = 2.0;
    float UIStep = 0.1;
    string UIName =  "bump intensity";
> = 1.5;

float Tiling : Power
<
    string UIWidget = "slider";
    float UIMin = 1.0;
    float UIMax = 5.0;
    float UIStep = 1.0;
    string UIName =  "bump intensity";
> = 1.0;


/******VALUES PULLED FROM FPSC - NON TWEAKABLE**********/

float4 AmbiColor : Ambient
<
    string UIName =  "Ambient Light Color";
> = {0.05f, 0.05f, 0.05f, 1.0f};






/****************** TEXTURES AND SAMPLERS*********************/

texture LightMap : DiffuseMap
<
    string Name = "LM.dds";
    string type = "2D";
>;

texture DiffuseMap : DiffuseMap
<
    string Name = "D.dds";
    string type = "2D";
>;

//could be anything here - ill,spec,normal,cube
texture SpecularMap : DiffuseMap
<
    string Name = "I.dds";
    string type = "2D";
>;

texture NormalMap : DiffuseMap
<
    string Name = "N.dds";
    string type = "2D";
>;



//Lightmap texture
sampler2D LightmapSampler = sampler_state
{
    Texture   = <LightMap>;
    MipFilter = ANISOTROPIC;
    MinFilter = ANISOTROPIC;
    MagFilter = ANISOTROPIC;
};


//Diffuse Texture _D
sampler2D DiffuseSampler = sampler_state
{
    Texture   = <DiffuseMap>;
    MipFilter = ANISOTROPIC;
    MinFilter = ANISOTROPIC;
    MagFilter = ANISOTROPIC;
};

//Effect Texture _I (could be anything here - ill,spec,normal,cube)
sampler2D SpecularSampler = sampler_state
{
    Texture   = <SpecularMap>;
    MipFilter = ANISOTROPIC;
    MinFilter = ANISOTROPIC;
    MagFilter = ANISOTROPIC;
};

//Effect Texture _N (could be anything here - ill,spec,normal,cube)
sampler2D NormalSampler = sampler_state
{
    Texture   = <NormalMap>;
    MipFilter = ANISOTROPIC;
    MinFilter = ANISOTROPIC;
    MagFilter = ANISOTROPIC;
};


;





/************* DATA STRUCTS **************/

struct appdata {
    float4 Position	: POSITION;
    float4 UV0		: TEXCOORD0;
    float4 UV1		: TEXCOORD1;
    float4 Normal	: NORMAL;
    
};



/*data passed to pixel shader*/
struct vertexOutput
{
    float4 Position    : POSITION;
    float2 TexCoord     : TEXCOORD0;
    float2 TexCoordLM   : TEXCOORD1;
    float3 LightVec	    : TEXCOORD2;
    float3 WorldNormal	: TEXCOORD3;
    float4 WPos : TEXCOORD4;
    float3 objEyeVec : TEXCOORD5;
};


/*******Vertex Shader***************************/

vertexOutput mainVS(appdata IN)   
{
    
	vertexOutput OUT;
    
    //float4 tempPos = float4(IN.Position, 1);
    float4 worldSpacePos = mul(IN.Position, World);
    
    OUT.WorldNormal = normalize(mul(IN.Normal, WorldIT).xyz);
    
    //object space eye position
    float4 objSpaceEyePos = mul(ViewInv[3] , WorldInv);
    OUT.objEyeVec = (objSpaceEyePos.xyz - IN.Position.xyz);
   
    float3 eyeoffset = float3 (10,LightHeight,0);
    OUT.LightVec = normalize (eyePos+eyeoffset - worldSpacePos );
    //OUT.LightVec = normalize (LightSource - worldSpacePos );
    OUT.Position = mul(IN.Position, WorldViewProj);
    OUT.TexCoord  = Tiling * IN.UV0 ; 
    OUT.TexCoordLM  = IN.UV1; 
    
    OUT.WPos =   worldSpacePos;                                                                        
                                           

    return OUT;
}


/****************Framgent Shader*****************/

float4 mainPS(vertexOutput IN) : COLOR
{
    
    
     float3 V  = (eyePos - IN.WPos);  
     float3 Vn  = normalize(V);
    
    ////////TANGENT BASIS CONSTRUCTION
    
    // get edge vectors of the pixel triangle
    float3 dp1 = ddx( -V );
    float3 dp2 = ddy( -V );
    float2 duv1 = ddx( IN.TexCoord.xy );
    float2 duv2 = ddy( IN.TexCoord.xy );

    // solve the linear system
    // (not much solving is left going here)
    float2x3 M = float2x3( dp1, dp2 );
    float3 T = mul( float2( duv1.x, duv2.x ), M );
    float3 B = mul( float2( duv1.y, duv2.y ), M );
    float3 Nn = normalize(IN.WorldNormal);
    // construct tangent frame basis matrix 
    float3x3 tangentbasis = float3x3(BumpIntensity* normalize(T),BumpIntensity* normalize(B),Nn );
    ///////////////////////////////////////////////////
        
        
    float4 diffuse = tex2D(DiffuseSampler,IN.TexCoord.xy);  //sample diffuse texture    
    float4 lightmap = tex2D(LightmapSampler,IN.TexCoordLM); //sample lightmap texture
    float4 effectmap = tex2D(SpecularSampler,IN.TexCoord.xy);  //sample specular map texture 
    //sample normal map and transform it into tangent space
    float3 Nb = normalize( mul( 2 * tex2D(NormalSampler,IN.TexCoord.xy ) - 1, tangentbasis ) );
    
    
   
    
    float3 Ln = normalize(IN.LightVec);
    
    
        
    //half vector
    float3 Hn = normalize(Vn+Ln);
    
    
    //calculate lighting Half Lambert scale and bias 
    //float4 lighting = lit(pow(0.5*(dot(Ln,Nb))+0.5,4),dot(Hn,Nb),32);
    float4 lighting = lit(((dot(Ln,Nb))),dot(Hn,Nb),Glossiness);

    
    //diffuse light contribution
    float4 diffuseContrib = (lightmap + AmbiColor) * diffuse * lighting.y ;
    
    //specular light contribution
    float4 specContrib = lighting.z * effectmap * (lightmap+0.1)  ;
    
    //hemisphere lighting simulation
    float HemisphereLight = 1 ;  
    float4 sky = lerp(0.5, 1, Nb.g);
    
        
    //final lighting with hemisphere lighting 
    //float4 result = diffuseContrib + (SpecAmount*specContrib) + (sky* diffuse*HemisphereLight)  ;
    
    //final lighting with hemisphere lighting and lightmap boost
    //float4 result = diffuseContrib + (SpecAmount*specContrib) + (sky* diffuse*HemisphereLight) +1.0*(lightmap*diffuse) ;
    
    //final lighting with lightmap boost
    //float4 result = diffuseContrib + (SpecAmount*specContrib) +1.0*(lightmap*diffuse) ;
    
    //final lighting 
    float4 result = diffuseContrib*sky + (SpecAmount*specContrib) +(0.5*lightmap*diffuse) ;
    
        
    return result;
    result.w =1;
}


/****** technique ********************************/

technique dx9textured
{
    pass P0
    {
        // lighting
        Lighting       = FALSE;
        FogEnable      = FALSE;
        CullMode = None;
        AlphaBlendEnable = FALSE;
        AlphaTestEnable = FALSE;

        // samplers
        //Sampler[0] = (LightmapSampler);
        //Sampler[1] = (DiffuseSampler);
        //Sampler[2] = (IllSpecSampler);
		//Sampler[3] = (NormalSampler);

        // shaders
        VertexShader = compile vs_3_0 mainVS();
        PixelShader  = compile ps_3_0 mainPS();
    }
}