[unity] Allow non-PMA textures for basic Spine-Unity shaders.

spine-unity/Assets/Spine/Runtime/spine-unity/Modules/Shaders/Spine-Skeleton-Fill.shader

@@ -1,12 +1,13 @@
 // - Unlit + no shadow
-// - Premultiplied Alpha Blending (One OneMinusSrcAlpha)
+// - Premultiplied Alpha Blending (Optional straight alpha input)
 // - Double-sided, no depth
 
 Shader "Spine/Skeleton Fill" {
 	Properties {
 		_FillColor ("FillColor", Color) = (1,1,1,1)
 		_FillPhase ("FillPhase", Range(0, 1)) = 0
-		[NoScaleOffset]_MainTex ("MainTex", 2D) = "white" {}
+		[NoScaleOffset] _MainTex ("MainTex", 2D) = "white" {}
+		[Toggle(_STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
 	}
 	SubShader {
 		Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane" }
@@ -17,6 +18,7 @@ Shader "Spine/Skeleton Fill" {
 
 		Pass {
 			CGPROGRAM
+			#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
 			#pragma vertex vert
 			#pragma fragment frag
 			#include "UnityCG.cginc"
@@ -40,13 +42,18 @@ Shader "Spine/Skeleton Fill" {
 				VertexOutput o = (VertexOutput)0;
 				o.uv = v.uv;
 				o.vertexColor = v.vertexColor;
-				o.pos = UnityObjectToClipPos(v.vertex); // Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
+				o.pos = UnityObjectToClipPos(v.vertex);
 				return o;
 			}
 
 			float4 frag (VertexOutput i) : COLOR {
 				float4 rawColor = tex2D(_MainTex,i.uv);
 				float finalAlpha = (rawColor.a * i.vertexColor.a);
+
+				#if defined(_STRAIGHT_ALPHA_INPUT)
+				rawColor.rgb *= rawColor.a;
+				#endif
+
 				float3 finalColor = lerp((rawColor.rgb * i.vertexColor.rgb), (_FillColor.rgb * finalAlpha), _FillPhase); // make sure to PMA _FillColor.
 				return fixed4(finalColor, finalAlpha);
 			}

spine-unity/Assets/Spine/Runtime/spine-unity/Modules/Shaders/Spine-Skeleton-Tint.shader

@@ -1,7 +1,7 @@
 // Spine/Skeleton Tint
 // - Two color tint
 // - unlit
-// - Premultiplied alpha blending
+// - Premultiplied alpha blending (Optional straight alpha input)
 // - No depth, no backface culling, no fog.
 
 Shader "Spine/Skeleton Tint" {
@@ -9,6 +9,7 @@ Shader "Spine/Skeleton Tint" {
 		_Color ("Tint Color", Color) = (1,1,1,1)
 		_Black ("Black Point", Color) = (0,0,0,0)
 		[NoScaleOffset] _MainTex ("MainTex", 2D) = "black" {}
+		[Toggle(_STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
 		_Cutoff ("Shadow alpha cutoff", Range(0,1)) = 0.1
 	}
 
@@ -23,6 +24,7 @@ Shader "Spine/Skeleton Tint" {
 
 		Pass {
 			CGPROGRAM
+			#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
 			#pragma vertex vert
 			#pragma fragment frag
 			#include "UnityCG.cginc"
@@ -44,7 +46,7 @@ Shader "Spine/Skeleton Tint" {
 
 			VertexOutput vert (VertexInput v) {
 				VertexOutput o;
-				o.pos = UnityObjectToClipPos(v.vertex); // replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
+				o.pos = UnityObjectToClipPos(v.vertex);
 				o.uv = v.uv;
 				o.vertexColor = v.vertexColor * float4(_Color.rgb * _Color.a, _Color.a); // Combine a PMA version of _Color with vertexColor.
 				return o;
@@ -52,6 +54,11 @@ Shader "Spine/Skeleton Tint" {
 
 			float4 frag (VertexOutput i) : COLOR {
 				float4 texColor = tex2D(_MainTex, i.uv);
+
+				#if defined(_STRAIGHT_ALPHA_INPUT)
+				texColor.rgb *= texColor.a;
+				#endif
+
 				return (texColor * i.vertexColor) + float4(((1-texColor.rgb) * _Black.rgb * texColor.a*_Color.a*i.vertexColor.a), 0);
 			}
 			ENDCG

spine-unity/Assets/Spine/Runtime/spine-unity/Modules/Shaders/Straight Alpha.meta

@@ -1,9 +0,0 @@
-fileFormatVersion: 2
-guid: d6f7e10049c6d6348ae5c92ccb3825e0
-folderAsset: yes
-timeCreated: 1521392482
-licenseType: Free
-DefaultImporter:
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 

spine-unity/Assets/Spine/Runtime/spine-unity/Modules/Shaders/Straight Alpha/Spine-Straight-Skeleton-Fill.shader

@@ -1,56 +0,0 @@
-// - Unlit + no shadow
-// - Double-sided, no depth
-
-Shader "Spine/Straight Alpha/Skeleton Fill" {
-	Properties {
-		_FillColor ("FillColor", Color) = (1,1,1,1)
-		_FillPhase ("FillPhase", Range(0, 1)) = 0
-		[NoScaleOffset]_MainTex ("MainTex", 2D) = "white" {}
-	}
-	SubShader {
-		Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane" }
-		Blend One OneMinusSrcAlpha
-		Cull Off
-		ZWrite Off
-		Lighting Off
-
-		Pass {
-			CGPROGRAM
-			#pragma vertex vert
-			#pragma fragment frag
-			#include "UnityCG.cginc"
-			sampler2D _MainTex;
-			float4 _FillColor;
-			float _FillPhase;
-
-			struct VertexInput {
-				float4 vertex : POSITION;
-				float2 uv : TEXCOORD0;
-				float4 vertexColor : COLOR;
-			};
-
-			struct VertexOutput {
-				float4 pos : SV_POSITION;
-				float2 uv : TEXCOORD0;
-				float4 vertexColor : COLOR;
-			};
-
-			VertexOutput vert (VertexInput v) {
-				VertexOutput o = (VertexOutput)0;
-				o.uv = v.uv;
-				o.vertexColor = v.vertexColor;
-				o.pos = UnityObjectToClipPos(v.vertex);
-				return o;
-			}
-
-			float4 frag (VertexOutput i) : COLOR {
-				float4 rawColor = tex2D(_MainTex,i.uv);
-				float finalAlpha = (rawColor.a * i.vertexColor.a);
-				float3 finalColor = lerp((rawColor.rgb * i.vertexColor.rgb * rawColor.a), (_FillColor.rgb * finalAlpha), _FillPhase);
-				return fixed4(finalColor, finalAlpha);
-			}
-			ENDCG
-		}
-	}
-	FallBack "Diffuse"
-}

spine-unity/Assets/Spine/Runtime/spine-unity/Modules/Shaders/Straight Alpha/Spine-Straight-Skeleton-Fill.shader.meta

@@ -1,9 +0,0 @@
-fileFormatVersion: 2
-guid: ec3c686f972ccf5459c2b55555e6635f
-timeCreated: 1492385797
-licenseType: Free
-ShaderImporter:
-  defaultTextures: []
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 

spine-unity/Assets/Spine/Runtime/spine-unity/Modules/Shaders/Straight Alpha/Spine-Straight-Skeleton-Tint.shader

@@ -1,99 +0,0 @@
-// - Two color tint
-// - unlit
-// - No depth, no backface culling, no fog.
-
-Shader "Spine/Straight Alpha/Skeleton Tint" {
-	Properties {
-		_Color ("Tint Color", Color) = (1,1,1,1)
-		_Black ("Black Point", Color) = (0,0,0,0)
-		[NoScaleOffset] _MainTex ("MainTex", 2D) = "black" {}
-		_Cutoff ("Shadow alpha cutoff", Range(0,1)) = 0.1
-	}
-
-	SubShader {
-		Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane" }
-
-		Fog { Mode Off }
-		Cull Off
-		ZWrite Off
-		Blend One OneMinusSrcAlpha
-		Lighting Off
-
-		Pass {
-			CGPROGRAM
-			#pragma vertex vert
-			#pragma fragment frag
-			#include "UnityCG.cginc"
-			sampler2D _MainTex;
-			float4 _Color;
-			float4 _Black;
-
-			struct VertexInput {
-				float4 vertex : POSITION;
-				float2 uv : TEXCOORD0;
-				float4 vertexColor : COLOR;
-			};
-
-			struct VertexOutput {
-				float4 pos : SV_POSITION;
-				float2 uv : TEXCOORD0;
-				float4 vertexColor : COLOR;
-			};
-
-			VertexOutput vert (VertexInput v) {
-				VertexOutput o;
-				o.pos = UnityObjectToClipPos(v.vertex); // replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
-				o.uv = v.uv;
-				o.vertexColor = v.vertexColor * float4(_Color.rgb * _Color.a, _Color.a); // Combine a PMA version of _Color with vertexColor.
-				return o;
-			}
-
-			float4 frag (VertexOutput i) : COLOR {
-				float4 texColor = tex2D(_MainTex, i.uv);
-				texColor = float4(texColor.rgb * texColor.a, texColor.a);
-				return (texColor * i.vertexColor) + float4(((1-texColor.rgb) * _Black.rgb * texColor.a*_Color.a*i.vertexColor.a), 0);
-			}
-			ENDCG
-		}
-
-		Pass {
-			Name "Caster"
-			Tags { "LightMode"="ShadowCaster" }
-			Offset 1, 1
-			ZWrite On
-			ZTest LEqual
-
-			Fog { Mode Off }
-			Cull Off
-			Lighting Off
-
-			CGPROGRAM
-			#pragma vertex vert
-			#pragma fragment frag
-			#pragma multi_compile_shadowcaster
-			#pragma fragmentoption ARB_precision_hint_fastest
-			#include "UnityCG.cginc"
-			sampler2D _MainTex;
-			fixed _Cutoff;
-
-			struct VertexOutput { 
-				V2F_SHADOW_CASTER;
-				float2 uv : TEXCOORD1;
-			};
-
-			VertexOutput vert (appdata_base v) {
-				VertexOutput o;
-				o.uv = v.texcoord;
-				TRANSFER_SHADOW_CASTER(o)
-				return o;
-			}
-
-			float4 frag (VertexOutput i) : COLOR {
-				fixed4 texcol = tex2D(_MainTex, i.uv);
-				clip(texcol.a - _Cutoff);
-				SHADOW_CASTER_FRAGMENT(i)
-			}
-			ENDCG
-		}
-	}
-}

spine-unity/Assets/Spine/Runtime/spine-unity/Modules/Shaders/Straight Alpha/Spine-Straight-Skeleton-Tint.shader.meta

@@ -1,7 +0,0 @@
-fileFormatVersion: 2
-guid: c9a84b3418d033a4f9749511a6ac36d6
-ShaderImporter:
-  defaultTextures: []
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: 

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

@@ -1,10 +1,12 @@
 // 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)"
+Shader "Spine/SkeletonGraphic Tint Black"
 {
 	Properties
 	{
 		[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
+		[Toggle(_STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
+
 		_Color ("Tint", Color) = (1,1,1,1)
 		_Black ("Black Point", Color) = (0,0,0,0)
 
@@ -50,6 +52,7 @@ Shader "Spine/SkeletonGraphic Tint Black (Premultiply Alpha)"
 		Pass
 		{
 		CGPROGRAM
+			#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
 			#pragma vertex vert
 			#pragma fragment frag
 
@@ -104,6 +107,10 @@ Shader "Spine/SkeletonGraphic Tint Black (Premultiply Alpha)"
 			{
 				half4 texColor = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd);
 
+				#if defined(_STRAIGHT_ALPHA_INPUT)
+				texColor.rgb *= texColor.a;
+				#endif
+
 				texColor.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
 
 				#ifdef UNITY_UI_ALPHACLIP

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

@@ -1,10 +1,11 @@
 // This is a premultiply-alpha adaptation of the built-in Unity shader "UI/Default" in Unity 5.6.2 to allow Unity UI stencil masking.
 
-Shader "Spine/SkeletonGraphic (Premultiply Alpha)"
+Shader "Spine/SkeletonGraphic"
 {
 	Properties
 	{
 		[PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
+		[Toggle(_STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
 		_Color ("Tint", Color) = (1,1,1,1)
 		
 		_StencilComp ("Stencil Comparison", Float) = 8
@@ -49,6 +50,7 @@ Shader "Spine/SkeletonGraphic (Premultiply Alpha)"
 		Pass
 		{
 		CGPROGRAM
+			#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
 			#pragma vertex vert
 			#pragma fragment frag
 			#pragma target 2.0
@@ -99,7 +101,13 @@ Shader "Spine/SkeletonGraphic (Premultiply Alpha)"
 
 			fixed4 frag (VertexOutput IN) : SV_Target
 			{
-				half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;
+				half4 texColor = tex2D(_MainTex, IN.texcoord);
+
+				#if defined(_STRAIGHT_ALPHA_INPUT)
+				texColor.rgb *= texColor.a;
+				#endif
+
+				half4 color = (texColor + _TextureSampleAdd) * IN.color;
 
 				color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
 

spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SlotBlendModes/Spine-Skeleton-PMA-Multiply.shader

@@ -11,6 +11,7 @@ Shader "Spine/Skeleton PMA Multiply" {
 	Properties {
 		_Color ("Tint Color", Color) = (1,1,1,1)
 		[NoScaleOffset] _MainTex ("MainTex", 2D) = "black" {}
+		[Toggle(_STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
 		_Cutoff ("Shadow alpha cutoff", Range(0,1)) = 0.1
 	}
 
@@ -26,6 +27,7 @@ Shader "Spine/Skeleton PMA Multiply" {
 
 		Pass {
 			CGPROGRAM
+			#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
 			#pragma vertex vert
 			#pragma fragment frag
 			#include "UnityCG.cginc"
@@ -54,6 +56,11 @@ Shader "Spine/Skeleton PMA Multiply" {
 
 			float4 frag (VertexOutput i) : COLOR {
 				float4 texColor = tex2D(_MainTex, i.uv);
+				
+				#if defined(_STRAIGHT_ALPHA_INPUT)
+				texColor.rgb *= texColor.a;
+				#endif
+
 				return (texColor * i.vertexColor);
 			}
 			ENDCG

spine-unity/Assets/Spine/Runtime/spine-unity/Modules/SlotBlendModes/Spine-Skeleton-PMA-Screen.shader

@@ -9,6 +9,7 @@ Shader "Spine/Skeleton PMA Screen" {
 	Properties {
 		_Color ("Tint Color", Color) = (1,1,1,1)
 		[NoScaleOffset] _MainTex ("MainTex", 2D) = "black" {}
+		[Toggle(_STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
 		_Cutoff ("Shadow alpha cutoff", Range(0,1)) = 0.1
 	}
 
@@ -24,6 +25,7 @@ Shader "Spine/Skeleton PMA Screen" {
 
 		Pass {
 			CGPROGRAM
+			#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
 			#pragma vertex vert
 			#pragma fragment frag
 			#include "UnityCG.cginc"
@@ -52,6 +54,11 @@ Shader "Spine/Skeleton PMA Screen" {
 
 			float4 frag (VertexOutput i) : COLOR {
 				float4 texColor = tex2D(_MainTex, i.uv);
+
+				#if defined(_STRAIGHT_ALPHA_INPUT)
+				texColor.rgb *= texColor.a;
+				#endif
+
 				return (texColor * i.vertexColor);
 			}
 			ENDCG

spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton-TintBlack.shader

@@ -3,7 +3,7 @@
 // - UV2 and UV3 as Black Tint color.
 // - Final black tint is (UV black data and _Black/"Black Point")
 // - unlit
-// - Premultiplied alpha blending
+// - Premultiplied alpha blending (optional straight alpha input)
 // - No depth, no backface culling, no fog.
 
 Shader "Spine/Skeleton Tint Black" {
@@ -11,6 +11,7 @@ Shader "Spine/Skeleton Tint Black" {
 		_Color ("Tint Color", Color) = (1,1,1,1)
 		_Black ("Black Point", Color) = (0,0,0,0)
 		[NoScaleOffset] _MainTex ("MainTex", 2D) = "black" {}
+		[Toggle(_STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
 		_Cutoff ("Shadow alpha cutoff", Range(0,1)) = 0.1
 	}
 
@@ -26,6 +27,7 @@ Shader "Spine/Skeleton Tint Black" {
 
 		Pass {
 			CGPROGRAM
+			#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
 			#pragma vertex vert
 			#pragma fragment frag
 			#include "UnityCG.cginc"
@@ -61,6 +63,11 @@ Shader "Spine/Skeleton Tint Black" {
 
 			float4 frag (VertexOutput i) : COLOR {
 				float4 texColor = tex2D(_MainTex, i.uv);
+				
+				#if defined(_STRAIGHT_ALPHA_INPUT)
+				texColor.rgb *= texColor.a;
+				#endif
+
 				return (texColor * i.vertexColor) + float4(((1-texColor.rgb) * (_Black.rgb + float3(i.uv1.r, i.uv1.g, i.uv2.r)) * texColor.a*_Color.a*i.vertexColor.a), 0);
 			}
 			ENDCG

spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-Skeleton.shader

@@ -2,10 +2,11 @@ Shader "Spine/Skeleton" {
 	Properties {
 		_Cutoff ("Shadow alpha cutoff", Range(0,1)) = 0.1
 		[NoScaleOffset] _MainTex ("Main Texture", 2D) = "black" {}
+		[Toggle(_STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
 	}
 
 	SubShader {
-		Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane"}
+		Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" "PreviewType"="Plane" }
 
 		Fog { Mode Off }
 		Cull Off
@@ -14,11 +15,43 @@ Shader "Spine/Skeleton" {
 		Lighting Off
 
 		Pass {
-			Fog { Mode Off }
-			ColorMaterial AmbientAndDiffuse
-			SetTexture [_MainTex] {
-				Combine texture * primary
+			CGPROGRAM
+			#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
+			#pragma vertex vert
+			#pragma fragment frag
+			#include "UnityCG.cginc"
+			sampler2D _MainTex;
+
+			struct VertexInput {
+				float4 vertex : POSITION;
+				float2 uv : TEXCOORD0;
+				float4 vertexColor : COLOR;
+			};
+
+			struct VertexOutput {
+				float4 pos : SV_POSITION;
+				float2 uv : TEXCOORD0;
+				float4 vertexColor : COLOR;
+			};
+
+			VertexOutput vert (VertexInput v) {
+				VertexOutput o;
+				o.pos = UnityObjectToClipPos(v.vertex);
+				o.uv = v.uv;
+				o.vertexColor = v.vertexColor;
+				return o;
+			}
+
+			float4 frag (VertexOutput i) : COLOR {
+				float4 texColor = tex2D(_MainTex, i.uv);
+
+				#if defined(_STRAIGHT_ALPHA_INPUT)
+				texColor.rgb *= texColor.a;
+				#endif
+
+				return (texColor * i.vertexColor);
 			}
+			ENDCG
 		}
 
 		Pass {
@@ -41,19 +74,19 @@ Shader "Spine/Skeleton" {
 			sampler2D _MainTex;
 			fixed _Cutoff;
 
-			struct v2f { 
+			struct VertexOutput { 
 				V2F_SHADOW_CASTER;
-				float2  uv : TEXCOORD1;
+				float2 uv : TEXCOORD1;
 			};
 
-			v2f vert (appdata_base v) {
-				v2f o;
-				TRANSFER_SHADOW_CASTER(o)
+			VertexOutput vert (appdata_base v) {
+				VertexOutput o;
 				o.uv = v.texcoord;
+				TRANSFER_SHADOW_CASTER(o)
 				return o;
 			}
 
-			float4 frag (v2f i) : COLOR {
+			float4 frag (VertexOutput i) : COLOR {
 				fixed4 texcol = tex2D(_MainTex, i.uv);
 				clip(texcol.a - _Cutoff);
 				SHADOW_CASTER_FRAGMENT(i)
@@ -61,20 +94,4 @@ Shader "Spine/Skeleton" {
 			ENDCG
 		}
 	}
-
-	SubShader {
-		Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
-
-		Cull Off
-		ZWrite Off
-		Blend One OneMinusSrcAlpha
-		Lighting Off
-
-		Pass {
-			ColorMaterial AmbientAndDiffuse
-			SetTexture [_MainTex] {
-				Combine texture * primary DOUBLE, texture * primary
-			}
-		}
-	}
 }

spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/Spine-SkeletonLit.shader

@@ -1,11 +1,12 @@
 // - Vertex Lit + ShadowCaster
-// - Premultiplied Alpha Blending (One OneMinusSrcAlpha)
+// - Premultiplied Alpha Blending (Optional straight alpha input)
 // - Double-sided, no depth
 
 Shader "Spine/Skeleton Lit" {
 	Properties {
 		_Cutoff ("Shadow alpha cutoff", Range(0,1)) = 0.1
 		[NoScaleOffset] _MainTex ("Main Texture", 2D) = "black" {}
+		[Toggle(_STRAIGHT_ALPHA_INPUT)] _StraightAlphaInput("Straight Alpha Texture", Int) = 0
 	}
 
 	SubShader {
@@ -38,6 +39,7 @@ Shader "Spine/Skeleton Lit" {
 			Blend One OneMinusSrcAlpha
 
 			CGPROGRAM
+			#pragma shader_feature _ _STRAIGHT_ALPHA_INPUT
 			#pragma vertex vert
 			#pragma fragment frag
 			#pragma target 2.0
@@ -135,7 +137,13 @@ Shader "Spine/Skeleton Lit" {
 				fixed4 tex = tex2D(_MainTex, i.uv0);
 
 				fixed4 col;
+
+				#if defined(_STRAIGHT_ALPHA_INPUT)
+				col.rgb = tex * i.color * tex.a;
+				#else
 				col.rgb = tex * i.color;
+				#endif
+				
 				col *= 2;
 				col.a = tex.a * i.color.a;
 				return col;