source: GTP/trunk/App/Demos/Illum/IBRBillboardCloudTrees/OGRE/IBRTreesOGRE/media/oldgeneral/tree_idtexturing_spotlight_vp_ATI_9700.shd @ 1493

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

float distanceScale;
float4 lattenuation;
float4 lightPosition;
float4 lightDirection;
float4 cameraPosition;
float4 cameraDirection;
float4x4 worldviewproj;
float4x4 worldmatrix;
float4x4 proj_matrix;
float4x4 texAdjMatrix;
float4x4 texMat;
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 worldpos = mul(worldmatrix,position);
        Out.normal = normal;
        Out.lightVec = lightPosition.xyz - worldpos.xyz;
        Out.viewVec = cameraPosition.xyz - position.xyz;
        Out.texCoord = texCoord;
        Out.texCoordNormalized = texCoordNormalized;
        //float4x4 texMat = mul(texMat,worldmatrix);
        //float4x4 texMat = mul(worldmatrix,texMat);    
        //float4 sPos = mul(texMat,position);
        
        //float4 sPos = mul(mul(proj_matrix,worldmatrix),position);
        float4 sPos = Out.Pos;
        // Use projective texturing to map the position of each fragment
        // to its corresponding texel in the shadow map.
        sPos.z += 1.0;
        //Out.shadowCrd.x = sPos.z + sPos.x;
        //Out.shadowCrd.y = sPos.z - sPos.y;
        //Out.shadowCrd.z = 0;
        //Out.shadowCrd.w = sPos.z + sPos.z;
        //Out.shadowCrd = sPos;
        // Projective texture coordinates, adjust for mapping
        float4x4 scalemat = float4x4(0.5,   0,      0,   0.5, 
                                     0,     -0.5,   0,   0.5,
                                     0,      0,     0.5, 0.5,
                                     0,      0,     0,   1);
        Out.shadowCrd = mul(scalemat,sPos);



        return Out;
}