From 6d8ff3edecf5c97e72bc79a7e733aa58f053c28c Mon Sep 17 00:00:00 2001
From: Robert Dorn <dorn@prefrontalcortex.de>
Date: Thu, 11 Jul 2024 13:52:07 +0200
Subject: [PATCH] fixes #746 - added uv-starts-at-top check -  based on unity
 docs

---
 Runtime/Shaders/ShaderGraph/PBRHelpers.cginc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Runtime/Shaders/ShaderGraph/PBRHelpers.cginc b/Runtime/Shaders/ShaderGraph/PBRHelpers.cginc
index d87dc03a4..1435ee864 100644
--- a/Runtime/Shaders/ShaderGraph/PBRHelpers.cginc
+++ b/Runtime/Shaders/ShaderGraph/PBRHelpers.cginc
@@ -51,6 +51,11 @@ float3 Sample4Tap(float2 uv, float lod)
 
 void SampleSceneColor_float(float2 uv, float lod, out float3 color)
 {
+	#if !UNITY_UV_STARTS_AT_TOP
+	if (_CameraOpaqueTexture_TexelSize.y > 0)
+		uv.y = 1-uv.y;
+	#endif
+	
 	#define REQUIRE_OPAQUE_TEXTURE // seems we need to define this ourselves? HDSceneColorNode does that as well
 
 #if defined(USE_CAMERA_OPAQUE)