[unity] Fixed URP shader issue with bloom and HDR. Closes #2574.

spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/2D/Include/Spine-Sprite-StandardPass-URP-2D.hlsl

@@ -109,7 +109,8 @@ half4 CombinedShapeLightFragment(VertexOutputSpriteURP2D input) : SV_Target
 #endif
 
 	half4 mask = SAMPLE_TEXTURE2D(_MaskTex, sampler_MaskTex, input.texcoord.xy);
-	main.rgb = main.a == 0 ? main.rgb : main.rgb / main.a; // un-premultiply for additive lights in CombinedShapeLightShared, reapply afterwards
+	// un-premultiply for additive lights in CombinedShapeLightShared, reapply afterwards
+	main.rgb = main.a < 0.001 ? main.rgb : main.rgb / main.a; // < epsilon prevents imprecision issues on some HW.
 #if UNITY_VERSION  < 202120
 	half4 pixel = half4(CombinedShapeLightShared(half4(main.rgb, 1), mask, input.lightingUV).rgb * main.a, main.a);
 #else

spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/Shaders/2D/Spine-SkeletonLit-URP-2D.shader

@@ -139,7 +139,7 @@ Shader "Universal Render Pipeline/2D/Spine/Skeleton Lit" {
 					return main;
 				#endif
 				// un-premultiply for additive lights in CombinedShapeLightShared, reapply afterwards
-				main.rgb = main.a == 0 ? main.rgb : main.rgb / main.a;
+				main.rgb = main.a < 0.001 ? main.rgb : main.rgb / main.a;
 			#else
 				#if !defined(_LIGHT_AFFECTS_ADDITIVE)
 				if (i.color.a == 0) {
@@ -149,10 +149,10 @@ Shader "Universal Render Pipeline/2D/Spine/Skeleton Lit" {
 
 				#if !defined(_STRAIGHT_ALPHA_INPUT)
 				// un-premultiply for additive lights in CombinedShapeLightShared, reapply afterwards
-				tex.rgb = tex.a == 0 ? tex.rgb : tex.rgb / tex.a;
+				tex.rgb = tex.a < 0.001 ? tex.rgb : tex.rgb / tex.a; // < epsilon prevents imprecision issues on some HW.
 				#endif
 				half4 main = tex * i.color;
-			#endif
+				#endif
 				half4 mask = SAMPLE_TEXTURE2D(_MaskTex, sampler_MaskTex, i.uv);
 			#if UNITY_VERSION  < 202120
 				return half4(CombinedShapeLightShared(half4(main.rgb, 1), mask, i.lightingUV).rgb * main.a, main.a);

spine-unity/Modules/com.esotericsoftware.spine.urp-shaders/package.json

@@ -2,7 +2,7 @@
   "name": "com.esotericsoftware.spine.urp-shaders",
   "displayName": "Spine Universal RP Shaders",
   "description": "This plugin provides universal render pipeline (URP) shaders for the spine-unity runtime.\n\nPrerequisites:\nIt requires a working installation of the spine-unity runtime, version 4.2.\n(See http://esotericsoftware.com/git/spine-runtimes/spine-unity)",
-  "version": "4.2.34",
+  "version": "4.2.35",
   "unity": "2019.3",
   "author": {
     "name": "Esoteric Software",