From e784103de99b468f738ffa9349c9fd84444cb024 Mon Sep 17 00:00:00 2001
From: Harald Csaszar <harald.csaszar@pixelcloudgames.com>
Date: Tue, 6 Sep 2022 17:25:54 +0200
Subject: [PATCH] [unity] Fixed Sprite pixel-lit shader incorrectly applying
 secondary lights. Closes #2147.

---
 .../Shaders/Sprite/CGIncludes/SpritePixelLighting.cginc    | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/CGIncludes/SpritePixelLighting.cginc b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/CGIncludes/SpritePixelLighting.cginc
index 8878df766..945e86f08 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/CGIncludes/SpritePixelLighting.cginc
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Sprite/CGIncludes/SpritePixelLighting.cginc
@@ -222,6 +222,13 @@ fixed4 fragAdd(VertexOutput input) : SV_Target
 
 	ALPHA_CLIP(texureColor, input.color)
 
+	// previous fragBase pass was zwrite pass, so overlapping regions require
+	// full alpha applied since they are applied only once.
+#if defined(_ALPHAPREMULTIPLY_ON)
+	texureColor.rgb /= texureColor.a == 0 ? 1 : texureColor.a;
+#endif
+	texureColor.a = 1.0;
+
 	//Get normal direction
 	fixed3 normalWorld = calculateNormalWorld(input);