#line 1 "complex-ogre-grass2-in.txt" 
// shadow receiver  	
void main( 
                         float4 position : POSITION
                       , float4 shadowUV    : TEXCOORD0
                       , float3 uv	        : TEXCOORD1
                       , float4 vertexLight : COLOR     
                      
                       , out float4 oColour : COLOR
              
                       , uniform sampler2D shadowMap : register(s0)
                       , uniform sampler2D diffuseMap : register(s1)
                      
                      //, uniform float inverseShadowmapSize
                      , uniform float fixedDepthBias
                      , uniform float gradientClamp
                      , uniform float gradientScaleBias
              )
{		
    if (shadowUV.z > 0)
    {
       float4 diffuse = tex2D(diffuseMap, uv.xy);
       if (diffuse.a > 0.001)
       {
            oColour = float4(0.0f, 0.0f, 0.0f, 0.0f);
  }
       else
       {
            // point on shadowmap (no gradient as cg1.4 compiler is unable to handle that complexity)
            shadowUV = shadowUV / shadowUV.w;
            float4 shadowDepths = tex2D(shadowMap, shadowUV.xy);        
            
            float gradientFactor = gradientClamp * gradientScaleBias;
            float depthAdjust = gradientFactor + fixedDepthBias * shadowDepths.x;
            float centerdepth = shadowDepths.x + depthAdjust;
  
            oColour = (centerdepth > shadowUV.z) ? float4(vertexLight.rgb, diffuse.a) : float4(0, 0, 0, diffuse.a);
       }
    }
    else
    {
        oColour = float4(0.0f, 0.0f, 0.0f, 0.0f);
    }
}