// Created by Ofer Rubinstein.
// Licesne http://c...content-available-to-author-only...s.org/licenses/by/3.0/
 
 
float4 DrawPS(GeoOut pin) : SV_TARGET
{
	pin.PosH2/=pin.PosH2.w;
	pin.PosH2.y = -pin.PosH2.y;
	// Sample Depth map according to screen space coordinates of the pixel.
	float2 d = gDepth.Sample(samLinear, float3(0.5*(pin.PosH2.xy+1), 0), 0);
	// Clip pixels hidden behind solid geometry(according to the depth map)
	clip (d.r-pin.PosH2.z);
	// Fade out pixels which are of distance of Delta units in the Z value
	float Delta = 10; 
	float z1 = gProj._43/(pin.PosH2.z-gProj._33);
	float z2 = gProj._43/(d.r-gProj._33);
	float l = max(min((z2-z1), Delta)/Delta, 0);
	// Make the particle look like a sphere
	float a = max((1.0-((pin.Tex.x-0.5)*(pin.Tex.x-0.5) + (pin.Tex.y-0.5)*(pin.Tex.y-0.5))/0.25), 0);
	// Blending two colors so that the particle is more red around the edge.
	float3 c1 = float3(0.75, 0.5, 0.1);
	float3 c2 = float3(0.5, 0, 0);
	a*=a;
	return float4((c1*a+(1-a)*c2)*a*l, a*l);
}
 

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