HaxeJolt

lib/haxejolt/JoltPhysics/Jolt/Shaders/ShaderVec3.h

@@ -0,0 +1,28 @@
+// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
+// SPDX-FileCopyrightText: 2025 Jorrit Rouwe
+// SPDX-License-Identifier: MIT
+
+inline float3 JPH_Vec3DecompressUnit(uint inValue)
+{
+	const float cOneOverSqrt2 = 0.70710678f;
+	const uint cNumBits = 14;
+	const uint cMask = (1u << cNumBits) - 1;
+	const uint cMaxValue = cMask - 1; // Need odd number of buckets to quantize to or else we can't encode 0
+	const float cScale = 2.0f * cOneOverSqrt2 / float(cMaxValue);
+
+	// Restore two components
+	float2 v2 = float2(float(inValue & cMask), float((inValue >> cNumBits) & cMask)) * cScale - float2(cOneOverSqrt2, cOneOverSqrt2);
+
+	// Restore the highest component
+	float3 v = float3(v2, sqrt(max(1.0f - dot(v2, v2), 0.0f)));
+
+	// Extract sign
+	if ((inValue & 0x80000000u) != 0)
+		v = -v;
+
+	// Swizzle the components in place
+	uint max_element = (inValue >> 29) & 3;
+	v = max_element == 0? v.zxy : (max_element == 1? v.xzy : v);
+
+	return v;
+}