//[entrypoint(ps)]
float ps_DrawDepth(in Hull h, out float d : SV_Depth) : SV_Target0
{
	float3 rd;
	float t;
	d = 0;
	if (raymarch(h, 24, rd, t))
	{
		float3 p = h.world + t * rd;
		d = length(p - _c._e.xyz) / 500;
		return exp(80 * d);
	}
	discard;
	return 0;
}

float log_conv(float x0, float X, float y0, float Y)
{
	return X + log(x0 + (y0 * exp(Y - X)));
}

float blur(float2 uv, float2 dirAndSize)
{
	const float coeff[7] = { 0.006, 0.061, 0.242, 0.382, 0.242, 0.061, 0.006 };
	float2 s = uv - 3 * dirAndSize.xy;
	float accum = 0;
	for (int i = 0; i < 7; ++i)
		accum += t2d4.Sample(s0, s + i * dirAndSize.xy).x * coeff[i];
	return accum;
}

//[entrypoint(ps)]
float ps_BlurH(in float2 uv : TEXCOORD) : SV_Target0
{
	float w,h;
	t2d4.GetDimensions(w, h);
	return blur(uv, float2(1/w,0));
}

//[entrypoint(ps)]
float ps_BlurV(in float2 uv : TEXCOORD) : SV_Target0
{
	float w,h;
	t2d4.GetDimensions(w, h);
	return blur(uv, float2(0,1/h));
}