source: GTP/trunk/App/Demos/Illum/Ogre/Media/MORIA/illum.hlsl @ 2404

#define SPOT_ANGLE 2.093
#define SPOT_FALLOFF 1
#define SHADOW_COLOR float4(0.3,0.3,0.3,1.0)
#define SHADOW_BIAS_POINT 0.0001
#define SHADOW_EPSILON_POINT 0.0001

float4 Illumination(float3 N, float3 L, float3 V, float4 lightColor, float4 lightRange, float4 diffuseColor, float specularity, float4 specularColor)
{
        // Blinn lighting
        float d = length(L);
        L = normalize(L);
        float3 H = normalize(L + V);
        float4 Lighting = lit(dot(N, L), dot(N, H), specularity);
        Lighting = saturate(Lighting);
        
        return   lightColor * (Lighting.y * diffuseColor + Lighting.z * specularColor) //color
                         / (lightRange.y + d * lightRange.z + d * d * lightRange.w) //attenuation
                         ;
                         
        //return lightColor * (Lighting.y * diffuseColor);
}

float3 NormalMap(float3 tangent, float3 binormal, float3 normal, float2 texCoord, sampler2D normalMap)
{       
        normal = normalize(normal);     
        //return normal;
        float3 mNormal;
        float3 tNormal = tex2D(normalMap, texCoord).rgb;
        //tNormal = float3(0.5,0.5,1.0);
        
    tangent = normalize(tangent);
        binormal = normalize(binormal); 
        float3x3 TangentToModel = float3x3(tangent, binormal, normal );
                
        tNormal.xy = (tNormal.xy *2.0) - 1.0;
        mNormal = normalize( mul( tNormal, TangentToModel ) );
        
    return mNormal;
}


float shadowPoint(samplerCUBE shadowMap, float3 lightCPos, float lightFarPlane)
{
          float light = 1;
          
          float dist = length(lightCPos) / lightFarPlane;
          float4 storedDist = texCUBE(shadowMap, float3(lightCPos.xy, -lightCPos.z));
          dist -= SHADOW_BIAS_POINT;
          float lit_factor = (dist <= storedDist.r);    
                 
          float M1 = storedDist.r;
          float M2 = storedDist.g;
          float v2 = min(max(M2 - M1 * M1, 0.0) +  SHADOW_EPSILON_POINT, 1.0);
          float m_d = M1 - dist;
          float pmax = v2 / (v2 + m_d * m_d);
                                                        
          light = max(lit_factor, pmax);        
                  
          return (SHADOW_COLOR + (1 - SHADOW_COLOR) * light);
}

uniform float4 prmAtlasTilesHalfPixel;
uniform float allClusterCount; 
uniform float clusterCount;

float4 PathMapIndirect(sampler2D PMTex, sampler2D weightIndexTex, sampler2D weightTex, float2 texAtlas)
{
        int2 prmAtlasTiles = prmAtlasTilesHalfPixel.xy;
        float2 atlasHalfPixel = prmAtlasTilesHalfPixel.zw;
        
        float3 col = 0;
        for(int iCluster = 0; iCluster < 8; iCluster++)
        {
                float2 prmTexPos = float2(
                        (texAtlas.x + (iCluster % prmAtlasTiles.x)) / prmAtlasTiles.x,
                        1.0 - (texAtlas.y + (iCluster / prmAtlasTiles.x)) / prmAtlasTiles.y);// + atlasHalfPixel;

                float weightIndex = tex2D(weightIndexTex, float2(((float)iCluster + 0.5) / clusterCount, 0.5)).r;
                float3 weight = tex2D(weightTex, float2((weightIndex + 0.5)/allClusterCount, 0.5)).rgb;
                float3 val = tex2D(PMTex, prmTexPos).xyz;
                if(length(val - float3(1,1,1))== 0)
                val = 0;
                col += val.xyz * weight;                
        }
        
        return float4(col,1);
}