source: GTP/trunk/App/Demos/Illum/IBRBillboardCloudTrees/OGRE/IBRTreesOGRE/media/oldgeneral/tree_idtexturing_spotlight_vp.shd @ 1493

struct VS_OUTPUT {
   float4 Pos:       POSITION;
   float3 normal:    TEXCOORD0;
   float4 lightVec : TEXCOORD1;
   float3 halfvec: TEXCOORD2;
   float4 shadowCrd: TEXCOORD3;
   float2 texCoord:  TEXCOORD4;
   float2 texCoordNormalized: TEXCOORD5;
   float4 lightVecNM: TEXCOORD6;
   float backside: TEXCOORD7;
};

float distanceScale;
float4 lattenuation;
float4 lightPosition;
float4 lightDirection;
float4 cameraPosition;
float4 cameraDirection;
float4x4 worldviewproj;
float4x4 worldmatrix;
float4x4 proj_matrix;
float time_0_X;

VS_OUTPUT main_vp(
      float4 position : POSITION,
      float3 normal : NORMAL,
      float2 texCoord : TEXCOORD0,
      float2 texCoordNormalized : TEXCOORD1,
      float3 inTangent : TEXCOORD2,
      float3 inBinormal : BINORMAL
      )
{

        VS_OUTPUT Out;

        Out.Pos = mul(worldviewproj, position);
        float4 world_pos = mul(worldmatrix,position);
        Out.backside = 0.0;

        // Thats why we compute the backside before converting
        // the normal to world-space coordinates...
        // cameraDirection is expressed in object space 
        if (dot(normal,cameraDirection) < 0.0)
        {
                Out.backside = 1.0;
        }
        cameraDirection = mul(worldmatrix,cameraDirection);
        normal = mul(worldmatrix,normal);
        Out.normal = normal;
        //Out.lightVec = lightPosition - world_pos;
        Out.lightVec = lightDirection;
        float dist = length(Out.lightVec.xyz);
        Out.lightVecNM.xyz = -Out.lightVec.xyz / dist; // For shadow mapping we were using distanceScale
        Out.lightVecNM.w = clamp(0.0,1.0,1.0 / (lattenuation.x + lattenuation.y * dist + lattenuation.z * dist * dist) );
        normal = mul(worldmatrix,normal);
        inTangent = mul(worldmatrix,inTangent);
        inBinormal = mul(worldmatrix,inBinormal);
        float3x3 tangentSpace;
        tangentSpace[0] = inTangent;
        tangentSpace[1] = cross(inTangent,normal.xyz);
        tangentSpace[2] = normal.xyz;
        float4 oviewVec = normalize(cameraPosition - world_pos);
        Out.halfvec = mul(tangentSpace,normalize(Out.lightVecNM.xyz+oviewVec.xyz));
        Out.lightVecNM = oviewVec;
        Out.texCoord = texCoord;
        Out.texCoordNormalized = texCoordNormalized;
        Out.shadowCrd = mul(proj_matrix, position);

        return Out;
}