source: GTP/trunk/App/Demos/Illum/pathmap/pathMap.fx @ 2304

float4x4 modelToWorldMatrix;
float4x4 inverseTransposedModelToWorldMatrix;
float4x4 modelToProjMatrix;

float4x4 occWorldToProjMatrix;
float3x3 occProjToTexMatrix;

int2 prmAtlasTiles;
float2 atlasHalfPixel;

texture brdfMap;                                                                //material texture sampler
sampler2D brdfMapSampler =      sampler_state{  
                texture = < brdfMap >;
                MinFilter = LINEAR;
                MagFilter = LINEAR;
                MipFilter = None;
                AddressU  = Wrap;
                AddressV  = Wrap;
                };
                
texture bumpMap;                                                                //material texture sampler
sampler2D bumpMapSampler =      sampler_state{  
                texture = < bumpMap >;
                MinFilter = LINEAR;
                MagFilter = LINEAR;
                MipFilter = None;
                AddressU  = Wrap;
                AddressV  = Wrap;
                };
                
texture normalMap;                                                              //material texture sampler
sampler2D normalMapSampler =    sampler_state{  
                texture = < normalMap >;
                MinFilter = LINEAR;
                MagFilter = LINEAR;
                MipFilter = None;
                AddressU  = Wrap;
                AddressV  = Wrap;
                };

texture filteredAtlas;
sampler filteredAtlasSampler = sampler_state
{
   Texture = <filteredAtlas>;
   MinFilter = LINEAR;
   MagFilter = LINEAR;
   MipFilter = None;
   AddressU = Wrap;
   AddressV = Wrap;
};

texture depthMap;
sampler2D depthMapSampler =     sampler_state{  
                texture = < depthMap >;
                MinFilter = Linear;
                MagFilter = Linear;
                MipFilter = None;
                AddressU  = Clamp;
                AddressV  = Clamp;
//              AddressU  = Border;
//              AddressV  = Border;
//              BorderColor = float4(65535, 65535, 65535, 65535);
                };
                
float3          lightPos;
float3          lightDir;
float3          lightPower;

float4          weightsa[8];

struct vsInputWalk
{
    float4 pos                  : POSITION;
    float3 normal               : NORMAL;
    float2 tex                  : TEXCOORD0;
    float2 texAtlas             : TEXCOORD1;
    float3 tangent              : TEXCOORD2;
    float3 binormal             : TEXCOORD3;
};

struct vsOutputWalk
{
    float4 pos                  : POSITION;
    float3 normal               : NORMAL;
    float3 tangent              : TEXCOORD4;
    float3 binormal             : TEXCOORD5;
    
    float2 tex                  : TEXCOORD0;
    float2 texAtlas             : TEXCOORD1;
    float4 worldPos             : TEXCOORD2;
    float4 occProjPos   : TEXCOORD3;    
};


vsOutputWalk
        vsWalk(vsInputWalk input)
{
        vsOutputWalk output = (vsOutputWalk)0;
        output.pos = mul(input.pos, modelToProjMatrix);

        output.worldPos = mul(input.pos, modelToWorldMatrix);
        output.occProjPos = mul(output.worldPos, occWorldToProjMatrix); 
        
        output.normal = mul(inverseTransposedModelToWorldMatrix, float4(input.normal.xyz, 0.0));
        output.tangent = mul(inverseTransposedModelToWorldMatrix, float4(input.tangent.xyz, 0.0));
        output.binormal = mul(inverseTransposedModelToWorldMatrix, float4(input.binormal.xyz, 0.0));
        output.tex = input.tex;
        output.texAtlas = input.texAtlas;
        
        return output;
}


float4
        psWalk(vsOutputWalk input) : COLOR
{
        float3 col = 0;
        for(int iCluster=0; iCluster<32; iCluster++)
        {
                float2 prmTexPos = float2(
                        (input.texAtlas.x + (iCluster % prmAtlasTiles.x)) / prmAtlasTiles.x,
                        1.0 - (input.texAtlas.y + (iCluster / prmAtlasTiles.x)) / prmAtlasTiles.y) + atlasHalfPixel;
                float4 weight = weightsa[iCluster/4];
                //weight = 0.065;
                float3 val = tex2D(filteredAtlasSampler, prmTexPos);
                col += val.xyz * weight.x;
                iCluster++;
                
                prmTexPos.x += 1.0 / prmAtlasTiles.x;
                val = tex2D(filteredAtlasSampler, prmTexPos);
                col += val.xyz * weight.y;
                iCluster++;
                
                prmTexPos.x += 1.0 / prmAtlasTiles.x;
                val = tex2D(filteredAtlasSampler, prmTexPos);
                col += val.xyz * weight.z;
                iCluster++;
                
                prmTexPos.x += 1.0 / prmAtlasTiles.x;
                val = tex2D(filteredAtlasSampler, prmTexPos);
                col += val.xyz * weight.w;
        }
//      col *= 1000.01; 
//      col *= 0.8;
//      col = 0;

    // get tangent space normal vector
/*    float3 tNormal = tex2D(normalMapSampler, input.tex).rgb;
        // which is the transpose of ModelToTangent
    float3 mNormal = normalize( input.tangent * tNormal.x + input.binormal * tNormal.y + input.normal * tNormal.z );

        input.normal = mNormal;
*/      
//      return float4(input.normal, 1);

        input.occProjPos /= input.occProjPos.w;
        float2 occTexPos = mul(input.occProjPos.xyw, occProjToTexMatrix);
        float3 toLight = lightPos - input.worldPos;
        float3 toLightDir = normalize(lightPos - input.worldPos);
        float cosa = dot(input.normal, toLightDir);
        float cosb = dot(lightDir, -toLightDir);
        
        float visibility = tex2Dproj(depthMapSampler, float4(occTexPos, input.occProjPos.z, 1));
        if(cosa > 0 && cosb > 0.0)
                col += cosa.xxx * pow(cosb, 9) * visibility / dot(toLight, toLight);
                
//      return float4(input.tangent,1);
//      return tex2D(filteredAtlasSampler, float2(input.texAtlas.x / 32.0, 1.0 - input.texAtlas.y));
        return float4( lightPower * col  * tex2D(brdfMapSampler, input.tex) , 1);
//      return float4(lightPower * col * tex2D(bumpMapSampler, input.tex), 1);
}

float4
        psWalkIndirect(vsOutputWalk input) : COLOR
{
        float3 col = 0;
        for(int iCluster=0; iCluster<32; iCluster++)
        {
                float2 prmTexPos = float2(
                        (input.texAtlas.x + (iCluster % prmAtlasTiles.x)) / prmAtlasTiles.x,
                        1.0 - (input.texAtlas.y + (iCluster / prmAtlasTiles.x)) / prmAtlasTiles.y) + atlasHalfPixel;
                float4 weight = weightsa[iCluster/4];
//              weight = 0.065;
                float3 val = tex2D(filteredAtlasSampler, prmTexPos);
                col += val.xyz * weight.x;
                iCluster++;
                
                prmTexPos.x += 1.0 / prmAtlasTiles.x;
                val = tex2D(filteredAtlasSampler, prmTexPos);
                col += val.xyz * weight.y;
                iCluster++;
                
                prmTexPos.x += 1.0 / prmAtlasTiles.x;
                val = tex2D(filteredAtlasSampler, prmTexPos);
                col += val.xyz * weight.z;
                iCluster++;
                
                prmTexPos.x += 1.0 / prmAtlasTiles.x;
                val = tex2D(filteredAtlasSampler, prmTexPos);
                col += val.xyz * weight.w;
        }

        return float4( lightPower * col  * tex2D(brdfMapSampler, input.tex) , 1);
//      return float4( lightPower * col, 1);
}

float4
        psWalkDirect(vsOutputWalk input) : COLOR
{
        float3 col = 0;

        input.occProjPos /= input.occProjPos.w;
        float2 occTexPos = mul(input.occProjPos.xyw, occProjToTexMatrix);
        float3 toLight = lightPos - input.worldPos;
        float3 toLightDir = normalize(lightPos - input.worldPos);
        float cosa = dot(input.normal, toLightDir);
        float cosb = dot(lightDir, -toLightDir);
        
        float visibility = tex2Dproj(depthMapSampler, float4(occTexPos, input.occProjPos.z, 1));
        if(cosa > 0 && cosb > 0.0)
                col += cosa.xxx * pow(cosb, 9) * visibility / dot(toLight, toLight);

        return float4( lightPower * col  * tex2D(brdfMapSampler, input.tex) , 1);
}

float4
        psWalkAmbient(vsOutputWalk input) : COLOR
{
        float3 col = 0.0001;

        input.occProjPos /= input.occProjPos.w;
        float2 occTexPos = mul(input.occProjPos.xyw, occProjToTexMatrix);
        float3 toLight = lightPos - input.worldPos;
        float3 toLightDir = normalize(lightPos - input.worldPos);
        float cosa = dot(input.normal, toLightDir);
        float cosb = dot(lightDir, -toLightDir);
        
        float visibility = tex2Dproj(depthMapSampler, float4(occTexPos, input.occProjPos.z, 1));
        if(cosa > 0 && cosb > 0.0)
                col += cosa.xxx * pow(cosb, 9) * visibility / dot(toLight, toLight);

        return float4( lightPower * col  * tex2D(brdfMapSampler, input.tex) , 1);
}

technique walk{
        pass P0
    {
        VertexShader = compile vs_3_0 vsWalk();
        PixelShader  = compile ps_3_0 psWalk();
    }
}

technique walkIndirect{
        pass P0
    {
        VertexShader = compile vs_3_0 vsWalk();
        PixelShader  = compile ps_3_0 psWalkIndirect();
    }
}

technique walkAmbient{
        pass P0
    {
        VertexShader = compile vs_3_0 vsWalk();
        PixelShader  = compile ps_3_0 psWalkAmbient();
    }
}

technique walkDirect{
        pass P0
    {
        VertexShader = compile vs_3_0 vsWalk();
        PixelShader  = compile ps_3_0 psWalkDirect();
    }
}

#include "bushToAtlas.fx"
#include "normalize.fx"
#include "showTex.fx"
#include "computeWeights.fx"
#include "depthMap.fx"
#include "dots.fx"
#include "torch.tx"