Replace all instances of _WorldSpaceCameraPos with center eye pos

Fixes left/right eye mismatch in VR.

1 files changed, 53 insertions, 0 deletions

diff --git a/cnlohr.cginc b/cnlohr.cginc
new file mode 100644
index 0000000..4df0ef1
--- /dev/null
+++ b/cnlohr.cginc
@@ -0,0 +1,53 @@
+#ifndef __CNLOHR_INC
+#define __CNLOHR_INC
+
+#include "globals.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)
+  return (unity_StereoWorldSpaceCameraPos[0] + unity_StereoWorldSpaceCameraPos[1]) / 2;
+#else
+  return isMirror() ? _VRChatMirrorCameraPos : _WorldSpaceCameraPos.xyz;
+#endif
+}
+
+#endif  // __CNLOHR_INC