source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/mrt.cg @ 2988

// input
struct vtxin 
{
  float4 position: POSITION;
  float3 normal: NORMAL;
  float4 color: COLOR0;
  float4 texCoord: TEXCOORD0;
};

// vtx output
struct vtxout
{
  float4 position: POSITION; // eye space
  float4 texCoord: TEXCOORD0;    

  float4 color: COLOR0;  
  float4 worldPos: TEXCOORD1; // world position
  float3 normal: TEXCOORD2;
  float4 mypos: TEXCOORD3;
};


// fragment input
struct fragin
{
        float4 color: COLOR0;  
        float4 position: POSITION; // eye space
        float4 texCoord: TEXCOORD0;    

        float4 projPos: WPOS;
        float4 worldPos: TEXCOORD1; // world position
        float3 normal: TEXCOORD2;
        float4 mypos: TEXCOORD3;
};


struct pixel
{
  float4 col: COLOR0;
  float4 pos: COLOR1;
  float4 norm: COLOR2;
};

#pragma position_invariant vtx

vtxout vtx(vtxin IN, 
                   const uniform float4x4 ModelViewProj,
                   uniform float4x4 ModelView)
{
        vtxout OUT;

        OUT.color = IN.color;
        OUT.texCoord = IN.texCoord;

        //OUT.worldPos = mul(glstate.matrix.inverse.projection, OUT.position);
        OUT.worldPos = mul(ModelView, IN.position);
        // transform the vertex position into eye space
        OUT.position = mul(glstate.matrix.mvp, IN.position);

        OUT.normal = IN.normal;
        OUT.mypos = OUT.position;

        return OUT;
}


pixel fragtex(fragin IN, 
                          uniform sampler2D dirtTex,
                          uniform float maxDepth,
                          uniform sampler2D tex,
                          uniform float3 currentPos)
{
        pixel pix;

        float4 texColor = tex2D(tex, IN.texCoord.xy);

        // save color in first render target
        // hack: use combination of emmisive + diffuse (emmisive used as constant ambient term)
        pix.col = (glstate.material.emission + glstate.material.diffuse) * texColor; 
        
        // save world position in second render target
        pix.pos = IN.worldPos * maxDepth;
        // save world space normal in third rt
        pix.norm.xyz = IN.normal;

        // store projection coordinates with positions (used for ssao)
        pix.norm.w = IN.projPos.w;
        // write the depth
        pix.pos.w = IN.mypos.z / IN.mypos.w;

        // account for alpha blending
        if (pix.col.w < 0.5f)
                discard;

        // hack: squeeze some information about ambient into the texture
        //pix.col.w = glstate.material.emission.x;
        pix.col.w = length((currentPos - IN.worldPos) * maxDepth);

        return pix;
}


pixel frag(fragin IN, uniform float maxDepth, uniform float3 currentPos)
{
        pixel pix;

        // hack: use comination of emmisive + diffuse (emmisive used as constant ambient term)
        pix.col = glstate.material.diffuse + glstate.material.emission;
        pix.pos = IN.worldPos * maxDepth;

        pix.norm.xyz = IN.normal;
        
        // store projection coordinates with positions (used for ssao)
        pix.norm.w = IN.mypos.w;
        // the projected depth
        pix.pos.w = IN.mypos.z / IN.mypos.w;
        
        // hack: squeeze some information about the ambient term into the target
        //pix.col.w = glstate.material.emission.x;
        pix.col.w = length((currentPos - IN.worldPos) * maxDepth);

        return pix;
}