Add tea, lcg and pcg into nb::hlsl::random

Author: kevyuu

docker/compiler-explorer

@@ -0,0 +1,34 @@
+// Copyright (C) 2018-2025 - DevSH Graphics Programming Sp. z O.O.
+// This file is part of the "Nabla Engine".
+// For conditions of distribution and use, see copyright notice in nabla.h
+
+#ifndef _NBL_BUILTIN_GLSL_RANDOM_LCG_HLSL_INCLUDED_
+#define _NBL_BUILTIN_GLSL_RANDOM_LCG_HLSL_INCLUDED_
+
+namespace nbl
+{
+namespace hlsl
+{
+
+struct Lcg
+{
+    static Lcg construct(NBL_CONST_REF_ARG(uint32_t) state)
+	{
+        return Lcg(state);
+    }
+	
+	uint32_t2 operator()()
+	{
+        uint32_t LCG_A = 1664525u;
+        uint32_t LCG_C = 1013904223u;
+        state = (LCG_A * state + LCG_C);
+        state &= 0x00FFFFFF;
+        return state;
+    }
+
+    uint32_t state;
+};
+
+}
+}
+#endif

include/nbl/builtin/hlsl/random/lcg.hlsl

@@ -0,0 +1,34 @@
+// Copyright (C) 2018-2025 - DevSH Graphics Programming Sp. z O.O.
+// This file is part of the "Nabla Engine".
+// For conditions of distribution and use, see copyright notice in nabla.h
+
+#ifndef _NBL_BUILTIN_GLSL_RANDOM_PCG_HLSL_INCLUDED_
+#define _NBL_BUILTIN_GLSL_RANDOM_PCG_HLSL_INCLUDED_
+
+namespace nbl
+{
+namespace hlsl
+{
+
+struct Pcg
+{
+	static Pcg construct(NBL_CONST_REF_ARG(uint32_t) initialState)
+	{
+		uint32_t state = {initialState};
+		return Pcg(state);
+	}
+	
+	uint32_t operator()()
+	{
+        const uint32_t tmp = state * 747796405u + 2891336453u;
+        const uint32_t word = ((tmp >> ((tmp >> 28u) + 4u)) ^ tmp) * 277803737u;
+        state = (word >> 22u) ^ word;
+		return state;
+    }
+	
+	uint32_t state;
+};
+
+}
+}
+#endif

include/nbl/builtin/hlsl/random/pcg.hlsl

@@ -0,0 +1,40 @@
+// Copyright (C) 2018-2025 - DevSH Graphics Programming Sp. z O.O.
+// This file is part of the "Nabla Engine".
+// For conditions of distribution and use, see copyright notice in nabla.h
+
+#ifndef _NBL_BUILTIN_GLSL_RANDOM_TEA_HLSL_INCLUDED_
+#define _NBL_BUILTIN_GLSL_RANDOM_TEA_HLSL_INCLUDED_
+
+namespace nbl
+{
+namespace hlsl
+{
+
+struct Tea
+{
+    static Tea construct()
+	{
+        Tea tea = {};
+        return tea;
+    }
+	
+    uint32_t2 operator()(uint32_t stream, uint32_t sequence, uint32_t roundCount)
+	{
+        uint32_t sum = 0;
+        uint32_t v0 = stream;
+        uint32_t v1 = sequence;
+        for (uint32_t n = 0; n < roundCount; n++)
+        {
+            sum += 0x9e3779b9;
+            v0 += ((v1 << 4) + 0xa341316c) ^ (v1 + sum) ^ ((v1 >> 5) + 0xc8013ea4);
+            v1 += ((v0 << 4) + 0xad90777d) ^ (v0 + sum) ^ ((v0 >> 5) + 0x7e95761e);
+        }
+
+		return uint32_t2(v0, v1);
+    }
+
+};
+
+}
+}
+#endif

include/nbl/builtin/hlsl/random/tea.hlsl

@@ -106,6 +106,9 @@ LIST_BUILTIN_RESOURCE(NBL_RESOURCES_TO_EMBED "glsl/property_pool/copy.comp")
 # random numbers
 LIST_BUILTIN_RESOURCE(NBL_RESOURCES_TO_EMBED "glsl/random/xoroshiro.glsl")
 LIST_BUILTIN_RESOURCE(NBL_RESOURCES_TO_EMBED "hlsl/random/xoroshiro.hlsl")
+LIST_BUILTIN_RESOURCE(NBL_RESOURCES_TO_EMBED "hlsl/random/pcg.hlsl")
+LIST_BUILTIN_RESOURCE(NBL_RESOURCES_TO_EMBED "hlsl/random/lcg.hlsl")
+LIST_BUILTIN_RESOURCE(NBL_RESOURCES_TO_EMBED "hlsl/random/tea.hlsl")
 # sampling
 LIST_BUILTIN_RESOURCE(NBL_RESOURCES_TO_EMBED "glsl/sampling/bilinear.glsl")
 LIST_BUILTIN_RESOURCE(NBL_RESOURCES_TO_EMBED "glsl/sampling/box_muller_transform.glsl")