'push'

Packages/com.waveharmonic.crest/Runtime/Shaders/Library/Utility/Noise/Noise.hlsl

@@ -0,0 +1,35 @@
+// See header/license in SOURCE.txt file accompanying this shader.
+
+// Trivial modifications made to the code to translate it to HLSL by Huw Bowles
+
+#ifndef CREST_GPU_NOISE_INCLUDED
+#define CREST_GPU_NOISE_INCLUDED
+
+uint baseHash(uint3 p)
+{
+    p = 1103515245U * ((p.xyz >> 1U) ^ (p.yzx));
+    uint h32 = 1103515245U * ((p.x^p.z) ^ (p.y >> 3U));
+    return h32 ^ (h32 >> 16);
+}
+
+float hash13(uint3 x)
+{
+    uint n = baseHash(x);
+    return float(n)*(1.0 / float(0xffffffffU));
+}
+
+float2 hash23(float3 x)
+{
+    uint n = baseHash(x);
+    uint2 rz = uint2(n, n * 48271U); //see: http://random.mat.sbg.ac.at/results/karl/server/node4.html
+    return float2(rz.xy & (uint2)0x7fffffffU) / float(0x7fffffff);
+}
+
+float3 hash33(uint3 x)
+{
+    uint n = baseHash(x);
+    uint3 rz = uint3(n, n * 16807U, n * 48271U); //see: http://random.mat.sbg.ac.at/results/karl/server/node4.html
+    return float3(rz & (uint3)0x7fffffffU) / float(0x7fffffff);
+}
+
+#endif // CREST_GPU_NOISE_INCLUDED