port from perforce

aquarium/src/intro/shaders/shadow.hlsl

@@ -0,0 +1,46 @@
+//[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));
+}