[unity] Added outline-only shader `Spine/Outline/OutlineOnly-ZWrite` respecting overlapping attachments. Renders in two passes. Closes #1751.

CHANGELOG.md

@@ -236,6 +236,7 @@
   * Added **SkeletonGraphic Timeline support**. Added supprot for multi-track Timeline preview in the Editor outside of play mode (multi-track scrubbing). See the [Timeline-Extension-UPM-Package](http://esotericsoftware.com/spine-unity#Timeline-Extension-UPM-Package) section of the spine-unity documentation for more information.
   * Added support for double-sided lighting at all `SkeletonLit` shaders (including URP and LWRP packages).
   * Added frustum culling update mode parameters `Update When Invisible` (Inspector parameter) and `UpdateMode` (available via code) to all Skeleton components. This provides a simple way to disable certain updates when the `Renderer` is no longer visible (outside all cameras, culled in frustum culling). The new `UpdateMode` property allows disabling updates at a finer granularity level than disabling the whole component. Available modes are: `Nothing`, `OnlyAnimationStatus`, `EverythingExceptMesh` and `FullUpdate`.
+  * Added a new `Spine/Outline/OutlineOnly-ZWrite` shader to provide correct outline-only rendering. Note: the shader requires two render passes and is therefore not compatible with URP. The `Spine Examples/Other Examples/Outline Shaders` example scene has been updated to demonstrate the new shader.
 
 * **Changes of default values**
   * `SkeletonMecanim`'s `Layer Mix Mode` now defaults to `MixMode.MixNext` instead of `MixMode.MixAlways`.

spine-unity/Assets/Spine Examples/Other Examples/Outline Shaders.unity

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@@ -762,13 +992,90 @@ MonoBehaviour:
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+  m_Text: 'SkeletonAnimation
+
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@@ -1215,7 +1524,7 @@ GameObject:
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spine-unity/Assets/Spine Examples/Spine Skeletons/Hero/hero-pro_MaterialOutlineOnly.mat

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spine-unity/Assets/Spine Examples/Spine Skeletons/Hero/hero-pro_MaterialOutlineOnly.mat.meta

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spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/CGIncludes/Spine-DepthOnlyPass.cginc

@@ -0,0 +1,41 @@
+#ifndef SPRITES_DEPTH_ONLY_PASS_INCLUDED
+#define SPRITES_DEPTH_ONLY_PASS_INCLUDED
+
+#include "UnityCG.cginc"
+
+sampler2D _MainTex;
+float _Cutoff;
+float _ZWriteOffset;
+
+struct VertexInput {
+	float4 positionOS : POSITION;
+	float2 texcoord : TEXCOORD0;
+	float4 vertexColor : COLOR;
+};
+
+struct VertexOutput {
+	float4 positionCS : SV_POSITION;
+	float4 texcoordAndAlpha: TEXCOORD0;
+};
+
+VertexOutput DepthOnlyVertex (VertexInput v) {
+	VertexOutput o;
+	o.positionCS = UnityObjectToClipPos(v.positionOS - float4(0, 0, _ZWriteOffset, 0));
+	o.texcoordAndAlpha.xy = v.texcoord;
+	o.texcoordAndAlpha.z = 0;
+	o.texcoordAndAlpha.a = v.vertexColor.a;
+	return o;
+}
+
+float4 DepthOnlyFragment (VertexOutput input) : SV_Target{
+	float4 texColor = tex2D(_MainTex, input.texcoordAndAlpha.rg);
+
+	#if defined(_STRAIGHT_ALPHA_INPUT)
+	texColor.rgb *= texColor.a;
+	#endif
+
+	clip(texColor.a * input.texcoordAndAlpha.a - _Cutoff);
+	return 0;
+}
+
+#endif

spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/CGIncludes/Spine-DepthOnlyPass.cginc.meta

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spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-OutlineOnly-ZWrite.shader

@@ -0,0 +1,62 @@
+Shader "Spine/Outline/OutlineOnly-ZWrite" {
+	Properties {
+		_Cutoff ("Depth alpha cutoff", Range(0,1)) = 0.1
+		_ZWriteOffset ("Depth offset", Range(0,1)) = 0.01
+		[NoScaleOffset] _MainTex ("Main Texture", 2D) = "black" {}
+		[Toggle(_STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
+		[HideInInspector] _StencilRef("Stencil Reference", Float) = 1.0
+		[HideInInspector][Enum(UnityEngine.Rendering.CompareFunction)] _StencilComp("Stencil Comparison", Float) = 8 // Set to Always as default
+
+		// Outline properties are drawn via custom editor.
+		[HideInInspector] _OutlineWidth("Outline Width", Range(0,8)) = 3.0
+		[HideInInspector] _OutlineColor("Outline Color", Color) = (1,1,0,1)
+		[HideInInspector] _OutlineReferenceTexWidth("Reference Texture Width", Int) = 1024
+		[HideInInspector] _ThresholdEnd("Outline Threshold", Range(0,1)) = 0.25
+		[HideInInspector] _OutlineSmoothness("Outline Smoothness", Range(0,1)) = 1.0
+		[HideInInspector][MaterialToggle(_USE8NEIGHBOURHOOD_ON)] _Use8Neighbourhood("Sample 8 Neighbours", Float) = 1
+		[HideInInspector] _OutlineMipLevel("Outline Mip Level", Range(0,3)) = 0
+	}
+
+	SubShader {
+		Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane" }
+
+		Fog { Mode Off }
+		Cull Off
+		ZWrite Off
+		Blend One OneMinusSrcAlpha
+		Lighting Off
+
+		Stencil {
+			Ref[_StencilRef]
+			Comp[_StencilComp]
+			Pass Keep
+		}
+
+		Pass
+		{
+			Name "DepthOnly"
+
+			ZWrite On
+			ColorMask 0
+			Cull Off
+
+			CGPROGRAM
+			#pragma vertex DepthOnlyVertex
+			#pragma fragment DepthOnlyFragment
+			#include "../CGIncludes/Spine-DepthOnlyPass.cginc"
+			ENDCG
+		}
+
+		Pass {
+			Name "Outline"
+			CGPROGRAM
+			#pragma vertex vertOutline
+			#pragma fragment fragOutline
+			#pragma shader_feature _ _USE8NEIGHBOURHOOD_ON
+			#include "CGIncludes/Spine-Outline-Pass.cginc"
+			ENDCG
+		}
+	}
+	FallBack "Spine/Skeleton"
+	CustomEditor "SpineShaderWithOutlineGUI"
+}

spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Outline/Spine-Skeleton-OutlineOnly-ZWrite.shader.meta

@@ -0,0 +1,9 @@
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+ShaderImporter:
+  externalObjects: {}
+  defaultTextures: []
+  nonModifiableTextures: []
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: