/// <inheritdoc/>
public float4 Execute()
{
float2 position = ((float2)(256 * ThreadIds.XY)) / DispatchSize.X + time;
float4 color = 0;
for (int i = 0; i < 6; i++)
{
float2 a = Hlsl.Floor(position);
float2 b = Hlsl.Frac(position);
float4 w = Hlsl.Frac(
(Hlsl.Sin(a.X * 7 + 31.0f * a.Y + 0.01f * time) +
new float4(0.035f, 0.01f, 0, 0.7f))
* 13.545317f);
color.XYZ += w.XYZ *
2.0f * Hlsl.SmoothStep(0.45f, 0.55f, w.W) *
Hlsl.Sqrt(16.0f * b.X * b.Y * (1.0f - b.X) * (1.0f - b.Y));
position /= 2.0f;
color /= 2.0f;
}
color.XYZ = Hlsl.Pow(color.XYZ, new float3(0.7f, 0.8f, 0.5f));
color.W = 1.0f;
return(color);
}
/// <inheritdoc/>
public float4 Execute()
{
float2 uv = (ThreadIds.XY - (float2)DispatchSize.XY * 0.5f) / DispatchSize.Y;
float3 col = 0;
float t = time * 0.3f;
for (float i = 0.0f; i <= 1.0f; i += 1.0f / NumberOfLayers)
{
float d = Hlsl.Frac(i + t);
float s = Hlsl.Lerp(5.0f, 0.5f, d);
float f = d * Hlsl.SmoothStep(1.0f, 0.9f, d);
col += Tex(new float3(uv.X * s, uv.Y * s, i * 4.0f)).XYZ *f;
}
col /= NumberOfLayers;
col *= new float3(2, 1.0f, 2.0f);
col = Hlsl.Pow(col, 0.5f);
return(new(col.X, col.Y, col.Z, 1.0f));
}
// The scene's distance function: There'd be faster ways to do this, but it's
// more readable this way. Plus, this is a pretty simple scene, so it's
// efficient enough.
private static float M(Float3 p)
{
float fl = -p.Z;
float obj = Truchet(p.XY);
obj = Hlsl.Max(obj, Hlsl.Abs(p.Z) - 0.125f) - Hlsl.SmoothStep(0.03f, 0.25f, -obj) * 0.1f;
float studs = 1e5f;
const float sc = 0.5f;
Float2 q = p.XY + 0.5f * sc;
Float2 iq = Hlsl.Floor(q / sc) + 0.5f;
q -= iq * sc;
if (Mod(iq.X + iq.Y, 2.0f) > 0.5f)
{
studs = Hlsl.Max(Hlsl.Length(q) - 0.1f * sc - 0.02f, Hlsl.Abs(p.Z) - 0.26f);
}
objID = fl < obj && fl < studs ? 0 : obj < studs ? 1 : 2;
return(Hlsl.Min(Hlsl.Min(fl, obj), studs));
}