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

/*
void main_vp(
      float4 position: POSITION,
      float4 normal: NORMAL,
      float2 texCoord : TEXCOORD0,

      out float3 lightpos : TEXCOORD3,
      out float3 eyePosition : TEXCOORD2,
      out float4 oPosition: POSITION,
      out float2 otexCoord : TEXCOORD0,
      //out float3 otexPos : TEXCOORD1,
      out float3 V : TEXCOORD1,
      out float3 L : TEXCOORD4,
      uniform float4 lightposition,             // world space
      uniform float4 cameraposition,            // world space
      uniform float3 camPosition : TEXCOORD2,   
      uniform float3 lightposi : TEXCOORD3,
      uniform float4x4 worldviewproj,
      uniform float4x4 worldmatrix,
      uniform float4x4 invworldmatrix,
      uniform float4x4 viewmatrix,
      uniform float4x4 projmatrix,
      uniform float4x4 viewprojmatrix,
      uniform float4x4 worldviewmatrix
      )
{
        oPosition = mul(worldviewproj,position);
        float4 pos = mul(worldviewmatrix,position);

        //float4 campos = mul(viewmatrix,float4(camPosition,1.0));
        float4 campos = mul(viewmatrix,cameraposition);
        eyePosition = campos.xyz;
        
        float4 lightp = mul(viewmatrix,float4(lightposi,1.0));
        //float4 lightp = mul(viewmatrix,lightposition);
        lightpos = lightp.xyz;

        V = -pos.xyz;
        L = lightpos - pos.xyz;

        otexCoord = texCoord;
}
*/
/*
void main_vp(
      float4 position : POSITION,
      float4 normal : NORMAL,
      float2 texCoord : TEXCOORD0,
      float2 texCoordNormalized : TEXCOORD1,

      out float4 oPosition : POSITION,
      out float2 otexCoord : TEXCOORD0,
      out float2 otexCoordNormalized : TEXCOORD1,
      uniform float4x4 worldviewproj
      )
{
        oPosition = mul(worldviewproj,position);
        otexCoord = texCoord;
        otexCoordNormalized = texCoordNormalized;
}
*/



void main_vp(
      float4 position : POSITION,
      float4 normal : NORMAL,
      float2 texCoord : TEXCOORD0,
      float2 texCoordNormalized : TEXCOORD1,

      uniform float distanceScale,
      uniform float4 lightPosition,
      uniform float4 lightDirection,
      uniform float4 camera_pos,
      uniform float4x4 worldviewproj,
      uniform float4x4 worldmatrix,
      uniform float4x4 proj_matrix,
      uniform float time_0_X,

      out float4 opos:       POSITION,
      out float3 onormal:    TEXCOORD0,
      out float3 olightVec : TEXCOORD1,
      out float3 oviewVec:   TEXCOORD2,
      out float4 oshadowCrd: TEXCOORD3,
      out float2 otexCoord:  TEXCOORD4,
      out float2 otexCoordNormalized: TEXCOORD5
      )
{
        opos = mul(worldviewproj, position);

        //------------------------------------------------------------
        // World-space lighting
        //------------------------------------------------------------
        onormal = normal;
        //onormal = mul(worldmatrix,normal);
        olightVec = distanceScale * (lightPosition - opos.xyz);
        oviewVec = camera_pos - opos.xyz;
        otexCoord = texCoord;
        otexCoordNormalized = texCoordNormalized;

        //------------------------------------------------------------
        // Light-space coordinates
        //------------------------------------------------------------
        float4 sPos = mul(proj_matrix, position);
        // Use projective texturing to map the position of each fragment
        // to its corresponding texel in the shadow map.
        sPos.z += 10;
        oshadowCrd.x = 0.5 * (sPos.z + sPos.x);
        oshadowCrd.y = 0.5 * (sPos.z - sPos.y);
        oshadowCrd.z = 0;
        oshadowCrd.w = sPos.z;
}