[unity] Built-in shaders for SkeletonGraphic tint black.

CHANGELOG.md

@@ -96,6 +96,7 @@
    * **Two color tinting** is currently supported via extra UV2 and UV3 mesh vertex streams. To use Two color tinting, you need to:
      * switch on "Tint Black" under "Advanced...",
      * use the new `Spine/Skeleton Tint Black` shader, or your own shader that treats the UV2 and UV3 streams similarly.
+     * Additionally, for SkeletonGraphic, you can use `Spine/SkeletonGraphic Tint Black` (or the bundled SkeletonGraphicTintBlack material) or your own shader that uses UV2 and UV3 streams similarly. **Additional Shader Channels** TexCoord1 and TexCoord2 will need to be enabled from the Canvas component's inspector. These correspond to UV2 and UV3. 
    * **Clipping** is now supported. Caution: The SkeletonAnimation switches to slightly slower mesh generation code when clipping so limit your use of `ClippingAttachment`s when using on large numbers of skeletons.
  * **SkeletonRenderer.initialFlip** Spine components such as SkeletonRenderer, SkeletonAnimation, SkeletonAnimator now has `initialFlipX` and `initialFlipY` fields which are also visible in the inspector under "Advanced...". It will allow you to set and preview a starting flip value for your skeleton component. This is applied immediately when the internal skeleton object is instantiated. 
  * **[SpineAttribute] Improvements** 

spine-unity/Assets/spine-unity/Modules/SkeletonGraphic/Shaders/SkeletonGraphicTintBlack.mat

@@ -0,0 +1,79 @@
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spine-unity/Assets/spine-unity/Modules/SkeletonGraphic/Shaders/SkeletonGraphicTintBlack.mat.meta

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spine-unity/Assets/spine-unity/Modules/SkeletonGraphic/Shaders/Spine-SkeletonGraphic-TintBlack.shader

@@ -0,0 +1,100 @@
+// This is a premultiply-alpha adaptation of the built-in Unity shader "UI/Default" to allow Unity UI stencil masking.
+
+Shader "Spine/SkeletonGraphic Tint Black (Premultiply Alpha)"
+{
+	Properties
+	{
+		[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
+		_Color ("Tint", Color) = (1,1,1,1)
+		_Black ("Black Point", Color) = (0,0,0,0)
+
+		_StencilComp ("Stencil Comparison", Float) = 8
+		_Stencil ("Stencil ID", Float) = 0
+		_StencilOp ("Stencil Operation", Float) = 0
+		_StencilWriteMask ("Stencil Write Mask", Float) = 255
+		_StencilReadMask ("Stencil Read Mask", Float) = 255
+
+		_ColorMask ("Color Mask", Float) = 15
+	}
+
+	SubShader
+	{
+		Tags
+		{ 
+			"Queue"="Transparent" 
+			"IgnoreProjector"="True" 
+			"RenderType"="Transparent" 
+			"PreviewType"="Plane"
+			"CanUseSpriteAtlas"="True"
+		}
+		
+		Stencil
+		{
+			Ref [_Stencil]
+			Comp [_StencilComp]
+			Pass [_StencilOp] 
+			ReadMask [_StencilReadMask]
+			WriteMask [_StencilWriteMask]
+		}
+
+		Cull Off
+		Lighting Off
+		ZWrite Off
+		ZTest [unity_GUIZTestMode]
+		Fog { Mode Off }
+		Blend One OneMinusSrcAlpha
+		ColorMask [_ColorMask]
+
+		Pass
+		{
+		CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+			#include "UnityCG.cginc"
+			fixed4 _Color;
+			fixed4 _Black;
+
+			struct VertexInput {
+				float4 vertex   : POSITION;
+				float4 color    : COLOR;
+				float2 texcoord : TEXCOORD0;
+				float2 uv1 : TEXCOORD1;
+				float2 uv2 : TEXCOORD2;
+			};
+
+			struct VertexOutput {
+				float4 vertex   : SV_POSITION;
+				fixed4 color    : COLOR;
+				half2 texcoord  : TEXCOORD0;
+				float2 uv1 : TEXCOORD1;
+				float2 uv2 : TEXCOORD2;
+			};
+			
+
+			VertexOutput vert (VertexInput IN) {
+				VertexOutput OUT;
+				OUT.vertex = UnityObjectToClipPos(IN.vertex);
+				OUT.texcoord = IN.texcoord;
+
+				#ifdef UNITY_HALF_TEXEL_OFFSET
+				OUT.vertex.xy += (_ScreenParams.zw-1.0) * float2(-1,1);
+				#endif
+
+				OUT.color = IN.color * float4(_Color.rgb * _Color.a, _Color.a); // Combine a PMA version of _Color with vertexColor.
+				OUT.uv1 = IN.uv1;
+				OUT.uv2 = IN.uv2;
+				return OUT;
+			}
+
+			sampler2D _MainTex;
+
+			fixed4 frag (VertexOutput IN) : SV_Target
+			{
+				float4 texColor = tex2D(_MainTex, IN.texcoord);
+				//clip(color.a - 0.01);
+				return (texColor * IN.color) + float4(((1-texColor.rgb) * texColor.a * (_Black.rgb + float3(IN.uv1.r, IN.uv1.g, IN.uv2.r))), 0);
+			}
+		ENDCG
+		}
+	}
+}

spine-unity/Assets/spine-unity/Modules/SkeletonGraphic/Shaders/Spine-SkeletonGraphic-TintBlack.shader.meta

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