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+#ifndef __CNLOHR_INC
+#define __CNLOHR_INC
+
+#include "globals.cginc"
+#include "interpolators.cginc"
+
+/*
+ * MIT License
+ *
+ * NOTE: Much content here is originally from others.  Content in third party
+ * folder may not be fully MIT-licensable. 
+ *
+ * Copyright (c) 2021 cnlohr, et. al.
+ *
+ * All other content in this repository falls under the following terms:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE
+ * SOFTWARE.
+ */
+
+// Source:
+// https://github.com/cnlohr/shadertrixx?tab=readme-ov-file#eye-center-position
+bool isMirror() { return _VRChatMirrorMode != 0; }
+
+// Source:
+// https://github.com/cnlohr/shadertrixx?tab=readme-ov-file#eye-center-position
+float3 getCenterCamPos() {
+#if defined(USING_STEREO_MATRICES) || defined(UNITY_SINGLE_PASS_STEREO)
+  return (unity_StereoWorldSpaceCameraPos[0] + unity_StereoWorldSpaceCameraPos[1]) * 0.5;
+#else
+  return isMirror() ? _VRChatMirrorCameraPos : _WorldSpaceCameraPos.xyz;
+#endif
+}
+
+bool isVR() {
+#if defined(USING_STEREO_MATRICES)
+  return true;
+#else
+  return false;
+#endif
+}
+
+float GetLinearZFromZDepth_WorksWithMirrors(float zDepthFromMap, float2 screenUV)
+{
+	#if defined(UNITY_REVERSED_Z)
+		zDepthFromMap = 1 - zDepthFromMap;
+
+		// When using a mirror, the far plane is whack.  This just checks for it and aborts.
+		if( zDepthFromMap >= 1.0 ) return _ProjectionParams.z;
+	#endif
+
+	float4 clipPos = float4(screenUV.xy, zDepthFromMap, 1.0);
+	clipPos.xyz = 2.0f * clipPos.xyz - 1.0f;
+	float4 camPos = mul(unity_CameraInvProjection, clipPos);
+	return -camPos.z / camPos.w;
+}
+
+void GetScreenUVAndPerspectiveFactor(float3 worldPos, float4 clipPos, out float2 screen_uv, out float perspective_factor) {
+    float3 full_vec_eye_to_geometry = worldPos - _WorldSpaceCameraPos;
+    float perspective_divide = 1.0f / clipPos.w;
+    perspective_factor = length(full_vec_eye_to_geometry * perspective_divide);
+    screen_uv = ComputeScreenPos(clipPos).xy;
+}
+
+#if defined(_SSAO)
+float GetDepthOfWorldPos(float3 worldPos, out float2 debug)
+{
+  float3 objPos = mul(unity_WorldToObject, float4(worldPos, 1));
+  float4 clipPos = UnityObjectToClipPos(objPos);
+  float4 screenPos = ComputeScreenPos(clipPos);
+  const float2 screen_uv = screenPos.xy / screenPos.w;
+
+  float zDepthFromMap = SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, screen_uv);
+  float linearZ =
+    GetLinearZFromZDepth_WorksWithMirrors(zDepthFromMap, screen_uv);
+  linearZ = min(1E3, linearZ);
+
+	debug = screen_uv;
+  return linearZ;
+}
+#endif
+
+#endif  // __CNLOHR_INC