source: GTP/trunk/App/Demos/Vis/FriendlyCulling/src/shaders/temporal.cg @ 2868

/** Computes the temporally smoothed indirect illumination buffer and combines it
        with the color buffer
*/
pixel main(fragment IN, 
                   uniform sampler2D colors,
                   uniform sampler2D ssao,
                   uniform sampler2D oldssao,
                   uniform sampler2D positions
                   const uniform float4x4 oldModelViewProj,
                   uniform float maxDepth,
                   uniform float expFactor
                   )
{
        pixel OUT;

        float4 centerPosition = tex2D(positions, IN.texCoord.xy);
        
        float4 col = tex2D(colors, IN.texCoord.xy);

        float ao = tex2D(ssao, IN.texCoord.xy);
        float4 attenuated_color = ao * col;
        //float4 attenuated_color = ao;

        //float4 new_col = globIllum(IN, colors, positions, noiseTexture, samples, normal.xyz, viewDir, noiseMultiplier, centerPosition); 
        //float4 attenuated_color = ao * col + new_col;
        
        const float x = expFactor;

        float4 dummy = centerPosition * maxDepth;
        dummy.w = 1.0f;

        float4 oldPos = mul(oldModelViewProj, dummy);

        float newDepth = oldPos.z / oldPos.w;
 
        float2 tex = (oldPos.xy / oldPos.w) * 0.5f + 0.5f;
        float4 col1 = tex2D(oldTex, tex);

        float oldDepth = col1.w;
        float depthDif = 1.0f - newDepth / oldDepth;

        if ((tex.x >= 0.0f) && (tex.x < 1.0f) && 
                (tex.y >= 0.0f) && (tex.y < 1.0f) && 
                (abs(depthDif)  < 1e-4f))
        {
                OUT.color = attenuated_color * expFactor + col1 * float4(1.0f - expFactor);
        }
        else
        {
                OUT.color = attenuated_color;
        }

        //OUT.color.xyz = viewDir;
        //OUT.color = attenuated_color;
        
        //OUT.color.w = tex2D(colors, IN.texCoord.xy).w;

        return OUT;
}