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

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

float distanceScale;
float4 lattenuation;
float4 lightPosition;
float4 lightDirection;
float4 cameraPosition;
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);

        //------------------------------------------------------------
        // World-space lighting
        //------------------------------------------------------------
        // world_pos,lightPosition,
        float world_pos = mul(worldmatrix,position);
        Out.normal = normal;
        Out.lightVec = lightPosition - world_pos;  // Used for shadow mapping
        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) );

        // Debugging purpose...
        normal = mul(worldmatrix,normal);
        inTangent = mul(worldmatrix,inTangent);
        inBinormal = mul(worldmatrix,inBinormal);

        float3x3 tangentSpace;
        // In Ogre3D the TAG BINORMAL and TANGENT are not used...
        tangentSpace[0] = inTangent;
        tangentSpace[1] = cross(inTangent,normal.xyz);
        tangentSpace[2] = normal.xyz;

        Out.viewVec = normalize(cameraPosition - world_pos);
        
        // Converted to Tangent-space
        Out.halfvec = mul(tangentSpace,normalize(Out.lightVecNM.xyz+Out.viewVec.xyz));
        Out.lightVecNM = float4(mul(tangentSpace,Out.lightVecNM.xyz),Out.lightVecNM.w);

        Out.texCoord = texCoord;
        Out.texCoordNormalized = texCoordNormalized;

        //------------------------------------------------------------
        // Light-space coordinates
        //------------------------------------------------------------
        float4 sPos = mul(proj_matrix, position);
        //float4 sPos = mul(position,proj_matrix);
        sPos.z += 10;
        //Out.shadowCrd.x = 0.5 * (sPos.z + sPos.x);
        //Out.shadowCrd.y = 0.5 * (sPos.z - sPos.y);
        //Out.shadowCrd.z = 0;
        //Out.shadowCrd.w = sPos.z;

        //Out.shadowCrd.x = sPos.x;
        //Out.shadowCrd.y = 1.0 - sPos.y;
        //Out.shadowCrd.z = 0.0;
        //Out.shadowCrd.w = sPos.z;

        Out.shadowCrd.x = sPos.x;
        Out.shadowCrd.y = 1.0 - sPos.y;
        Out.shadowCrd.z = 0.0;
        Out.shadowCrd.w = sPos.z;

        return Out;
}