/** 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;
}