source: GTP/trunk/App/Demos/Illum/Shark3D/version164x12u/IllumDemo/src/res/levelutil/shader/prog/d3d9_hlsl/gtp_caustic_cubemap_tri_d3d9_hlsl_vs3x0.s3d_shadercode @ 2196

// gametools
#include \
    <levelutil/shader/prog/d3d9_hlsl/include_stddef_d3d9_hlsl.s3d_shadercode_run>


struct VS_INPUT
{
    float2 texCoord : TEXCOORD0;
    float4 posObj: POSITION;   
};

struct VS_OUTPUT
{
    float4 posScr: POSITION;
    float4 color :TEXCOORD0;
    
};


///////////////////////////////////////////////////////////////////////////////
// Vertexshader
// Profile: 3x0
const float4x4 projMat;
const float4x4 matView;
const float4x4 matViewInv;
sampler tex0: register(s0);

VS_OUTPUT main(VS_INPUT input)
{
    
    VS_OUTPUT output = (VS_OUTPUT)0;
  
   float4 pos = tex2Dlod(tex0, float4(input.posObj.x, input.posObj.y,0,0));
    
  output.color = float4(1,0,1,1);
   if(pos.w == 0)
   {
        output.color = float4(0,0,0,0);
        output.posScr = float4(0, 0, -1000000, 1);
   }
   else
   {
        float4 mPosition = float4(normalize(pos.xyz),1); 
       float4 cPosition = mul(mPosition, matView);
        float4 hPosition = mul(cPosition, projMat); 
       
        float intensity = 0.25;         
         
        //read four neighbours
        float pixel = 1.0 / 32.0;
        float sumdist = 0;
        float dist;
        float valids = 0;
        float4 pos1 = tex2Dlod(tex0, float4(input.posObj.xy + float2(pixel, pixel),0,0));
        if(pos1.a != 0)
        {
            dist = length(pos1.xyz - pos.xyz);
            sumdist += dist;
            valids++;
        }           
        
        float4 pos2 = tex2Dlod(tex0, float4(input.posObj.xy + float2(-pixel, pixel),0,0));
        if(pos2.a != 0)
        {
            dist = length(pos2.xyz - pos.xyz);
            sumdist += dist;
            valids++;
        }
        
        float4 pos3 = tex2Dlod(tex0, float4(input.posObj.xy + float2(pixel, -pixel),0,0));
        if(pos3.a != 0)
        {
            dist = length(pos3.xyz - pos.xyz);
            sumdist += dist;
            valids++;
        }
        
        float4 pos4 = tex2Dlod(tex0, float4(input.posObj.xy + float2(-pixel, -pixel),0,0));
        if(pos4.a != 0)
        {
            dist = length(pos4.xyz - pos.xyz);
            sumdist += dist;
            valids++;
        }
        
        float avrdist = sumdist / valids;
        intensity = 0.5 / (avrdist * avrdist * 3.14);
        
        output.color = intensity;        
        output.posScr = hPosition;          
   } 
    
   return output;
}

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