[unity] Fixed `Shadow alpha cutoff` shader parameters ignoring SlotColor.alpha at all Spine shaders. Now the texture color is multiplied with slot color before the alpha test. Closes #1350.

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

@@ -91,19 +91,20 @@ Shader "Spine/Skeleton Fill" {
 
 			struct VertexOutput { 
 				V2F_SHADOW_CASTER;
-				float2 uv : TEXCOORD1;
+				float4 uvAndAlpha : TEXCOORD1;
 			};
 
-			VertexOutput vert (appdata_base v) {
+			VertexOutput vert (appdata_base v, float4 vertexColor : COLOR) {
 				VertexOutput o;
-				o.uv = v.texcoord;
+				o.uvAndAlpha = v.texcoord;
+				o.uvAndAlpha.a = vertexColor.a;
 				TRANSFER_SHADOW_CASTER(o)
 				return o;
 			}
 
 			float4 frag (VertexOutput i) : COLOR {
-				fixed4 texcol = tex2D(_MainTex, i.uv);
-				clip(texcol.a - _Cutoff);
+				fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
+				clip(texcol.a * i.uvAndAlpha.a - _Cutoff);
 				SHADOW_CASTER_FRAGMENT(i)
 			}
 			ENDCG

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

@@ -94,19 +94,20 @@ Shader "Spine/Skeleton Tint" {
 
 			struct VertexOutput { 
 				V2F_SHADOW_CASTER;
-				float2 uv : TEXCOORD1;
+				float4 uvAndAlpha : TEXCOORD1;
 			};
 
-			VertexOutput vert (appdata_base v) {
+			VertexOutput vert (appdata_base v, float4 vertexColor : COLOR) {
 				VertexOutput o;
-				o.uv = v.texcoord;
+				o.uvAndAlpha = v.texcoord;
+				o.uvAndAlpha.a = vertexColor.a;
 				TRANSFER_SHADOW_CASTER(o)
 				return o;
 			}
 
 			float4 frag (VertexOutput i) : COLOR {
-				fixed4 texcol = tex2D(_MainTex, i.uv);
-				clip(texcol.a - _Cutoff);
+				fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
+				clip(texcol.a * i.uvAndAlpha.a - _Cutoff);
 				SHADOW_CASTER_FRAGMENT(i)
 			}
 			ENDCG

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

@@ -91,19 +91,20 @@ Shader "Spine/Special/Skeleton Grayscale" {
 
 			struct VertexOutput { 
 				V2F_SHADOW_CASTER;
-				float2 uv : TEXCOORD1;
+				float4 uvAndAlpha : TEXCOORD1;
 			};
 
-			VertexOutput vert (appdata_base v) {
+			VertexOutput vert (appdata_base v, float4 vertexColor : COLOR) {
 				VertexOutput o;
-				o.uv = v.texcoord;
+				o.uvAndAlpha = v.texcoord;
+				o.uvAndAlpha.a = vertexColor.a;
 				TRANSFER_SHADOW_CASTER(o)
 				return o;
 			}
 
 			float4 frag (VertexOutput i) : COLOR {
-				fixed4 texcol = tex2D(_MainTex, i.uv);
-				clip(texcol.a - _Cutoff);
+				fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
+				clip(texcol.a * i.uvAndAlpha.a - _Cutoff);
 				SHADOW_CASTER_FRAGMENT(i)
 			}
 			ENDCG

spine-unity/Assets/Spine/Runtime/spine-unity/Modules/Shaders/Sprite/CGIncludes/SpriteShadows.cginc

@@ -16,18 +16,20 @@ struct vertexInput
 struct vertexOutput
 { 
 	V2F_SHADOW_CASTER;
-	float2 texcoord : TEXCOORD1;
+	float4 texcoordAndAlpha : TEXCOORD1;
 };
 
 ////////////////////////////////////////
 // Vertex program
 //
 
-vertexOutput vert(vertexInput v)
+vertexOutput vert(vertexInput v, float4 vertexColor : COLOR)
 {
 	vertexOutput o;
 	TRANSFER_SHADOW_CASTER(o)
-	o.texcoord = calculateTextureCoord(v.texcoord);
+	o.texcoordAndAlpha.xy = calculateTextureCoord(v.texcoord);
+	o.texcoordAndAlpha.z = 0;
+	o.texcoordAndAlpha.a = vertexColor.a;
 	return o;
 }
 
@@ -40,8 +42,8 @@ uniform fixed _ShadowAlphaCutoff;
 
 fixed4 frag(vertexOutput IN) : COLOR 
 {
-	fixed4 texureColor = calculateTexturePixel(IN.texcoord);
-	clip(texureColor.a - _ShadowAlphaCutoff);
+	fixed4 texureColor = calculateTexturePixel(IN.texcoordAndAlpha.xy);
+	clip(texureColor.a * IN.texcoordAndAlpha.a - _ShadowAlphaCutoff);
 	
 	SHADOW_CASTER_FRAGMENT(IN)
 }

spine-unity/Assets/Spine/Runtime/spine-unity/Modules/Shaders/Sprite/SpriteShadows.cginc

@@ -16,7 +16,7 @@ struct vertexInput
 struct vertexOutput
 { 
 	V2F_SHADOW_CASTER;
-	float4 texcoord : TEXCOORD1;
+	float4 texcoordAndAlpha : TEXCOORD1;
 };
 
 ////////////////////////////////////////
@@ -26,11 +26,13 @@ struct vertexOutput
 uniform sampler2D _MainTex;
 uniform fixed4 _MainTex_ST;
 
-vertexOutput vert(vertexInput v)
+vertexOutput vert(vertexInput v, float4 vertexColor : COLOR)
 {
 	vertexOutput o;
 	TRANSFER_SHADOW_CASTER(o)
-	o.texcoord = float4(TRANSFORM_TEX(v.texcoord, _MainTex), 0, 0);
+	o.texcoordAndAlpha.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
+	o.texcoordAndAlpha.z = 0;
+	o.texcoordAndAlpha.a = vertexColor.a;
 	return o;
 }
 
@@ -43,8 +45,8 @@ uniform fixed _ShadowAlphaCutoff;
 
 fixed4 frag(vertexOutput IN) : COLOR 
 {
-	fixed4 texureColor = tex2D(_MainTex, IN.texcoord.xy);
-	clip(texureColor.a - _ShadowAlphaCutoff);
+	fixed4 texureColor = tex2D(_MainTex, IN.texcoordAndAlpha.xy);
+	clip(texureColor.a * IN.texcoordAndAlpha.a - _ShadowAlphaCutoff);
 	
 	SHADOW_CASTER_FRAGMENT(IN)
 }

spine-unity/Assets/Spine/Runtime/spine-unity/Modules/Shaders/Sprite/SpritesUnlit.shader

@@ -80,7 +80,7 @@ Shader "Spine/Sprite/Unlit"
 			Cull Off
 			Lighting Off
 			
-			CGPROGRAM		
+			CGPROGRAM
 				#pragma fragmentoption ARB_precision_hint_fastest
 				#pragma multi_compile_shadowcaster
 				#pragma multi_compile _ PIXELSNAP_ON

spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Additive.shader

@@ -88,15 +88,17 @@ Shader "Spine/Blend Modes/Skeleton PMA Additive" {
 			#include "UnityCG.cginc"
 			struct v2f { 
 				V2F_SHADOW_CASTER;
-				float2 uv : TEXCOORD1;
+				float4 uvAndAlpha : TEXCOORD1;
 			};
 
 			uniform float4 _MainTex_ST;
 
-			v2f vert (appdata_base v) {
+			v2f vert (appdata_base v, float4 vertexColor : COLOR) {
 				v2f o;
 				TRANSFER_SHADOW_CASTER(o)
-				o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
+				o.uvAndAlpha.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
+				o.uvAndAlpha.z = 0;
+				o.uvAndAlpha.a = vertexColor.a;
 				return o;
 			}
 
@@ -104,8 +106,8 @@ Shader "Spine/Blend Modes/Skeleton PMA Additive" {
 			uniform fixed _Cutoff;
 
 			float4 frag (v2f i) : COLOR {
-				fixed4 texcol = tex2D(_MainTex, i.uv);
-				clip(texcol.a - _Cutoff);
+				fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
+				clip(texcol.a * i.uvAndAlpha.a - _Cutoff);
 				SHADOW_CASTER_FRAGMENT(i)
 			}
 			ENDCG

spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Multiply.shader

@@ -88,15 +88,17 @@ Shader "Spine/Blend Modes/Skeleton PMA Multiply" {
 			#include "UnityCG.cginc"
 			struct v2f { 
 				V2F_SHADOW_CASTER;
-				float2 uv : TEXCOORD1;
+				float4 uvAndAlpha : TEXCOORD1;
 			};
 
 			uniform float4 _MainTex_ST;
 
-			v2f vert (appdata_base v) {
+			v2f vert (appdata_base v, float4 vertexColor : COLOR) {
 				v2f o;
 				TRANSFER_SHADOW_CASTER(o)
-				o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
+				o.uvAndAlpha.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
+				o.uvAndAlpha.z = 0;
+				o.uvAndAlpha.a = vertexColor.a;
 				return o;
 			}
 
@@ -104,8 +106,8 @@ Shader "Spine/Blend Modes/Skeleton PMA Multiply" {
 			uniform fixed _Cutoff;
 
 			float4 frag (v2f i) : COLOR {
-				fixed4 texcol = tex2D(_MainTex, i.uv);
-				clip(texcol.a - _Cutoff);
+				fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
+				clip(texcol.a * i.uvAndAlpha.a - _Cutoff);
 				SHADOW_CASTER_FRAGMENT(i)
 			}
 			ENDCG

spine-unity/Assets/Spine/Runtime/spine-unity/Shaders/BlendModes/Spine-Skeleton-PMA-Screen.shader

@@ -88,15 +88,17 @@ Shader "Spine/Blend Modes/Skeleton PMA Screen" {
 			#include "UnityCG.cginc"
 			struct v2f { 
 				V2F_SHADOW_CASTER;
-				float2 uv : TEXCOORD1;
+				float4 uvAndAlpha : TEXCOORD1;
 			};
 
 			uniform float4 _MainTex_ST;
 
-			v2f vert (appdata_base v) {
+			v2f vert (appdata_base v, float4 vertexColor : COLOR) {
 				v2f o;
 				TRANSFER_SHADOW_CASTER(o)
-				o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
+				o.uvAndAlpha.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
+				o.uvAndAlpha.z = 0;
+				o.uvAndAlpha.a = vertexColor.a;
 				return o;
 			}
 
@@ -104,8 +106,8 @@ Shader "Spine/Blend Modes/Skeleton PMA Screen" {
 			uniform fixed _Cutoff;
 
 			float4 frag (v2f i) : COLOR {
-				fixed4 texcol = tex2D(_MainTex, i.uv);
-				clip(texcol.a - _Cutoff);
+				fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
+				clip(texcol.a * i.uvAndAlpha.a - _Cutoff);
 				SHADOW_CASTER_FRAGMENT(i)
 			}
 			ENDCG

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

@@ -100,19 +100,20 @@ Shader "Spine/Skeleton Tint Black" {
 
 			struct v2f { 
 				V2F_SHADOW_CASTER;
-				float2 uv : TEXCOORD1;
+				float4 uvAndAlpha : TEXCOORD1;
 			};
 
-			v2f vert (appdata_base v) {
+			v2f vert (appdata_base v, float4 vertexColor : COLOR) {
 				v2f o;
 				TRANSFER_SHADOW_CASTER(o)
-				o.uv = v.texcoord;
+				o.uvAndAlpha = v.texcoord;
+				o.uvAndAlpha.a = vertexColor.a;
 				return o;
 			}
 
 			float4 frag (v2f i) : COLOR {
-				fixed4 texcol = tex2D(_MainTex, i.uv);
-				clip(texcol.a - _Cutoff);
+				fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
+				clip(texcol.a * i.uvAndAlpha.a - _Cutoff);
 				SHADOW_CASTER_FRAGMENT(i)
 			}
 			ENDCG

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

@@ -84,19 +84,20 @@ Shader "Spine/Skeleton" {
 
 			struct VertexOutput { 
 				V2F_SHADOW_CASTER;
-				float2 uv : TEXCOORD1;
+				float4 uvAndAlpha : TEXCOORD1;
 			};
 
-			VertexOutput vert (appdata_base v) {
+			VertexOutput vert (appdata_base v, float4 vertexColor : COLOR) {
 				VertexOutput o;
-				o.uv = v.texcoord;
+				o.uvAndAlpha = v.texcoord;
+				o.uvAndAlpha.a = vertexColor.a;
 				TRANSFER_SHADOW_CASTER(o)
 				return o;
 			}
 
 			float4 frag (VertexOutput i) : COLOR {
-				fixed4 texcol = tex2D(_MainTex, i.uv);
-				clip(texcol.a - _Cutoff);
+				fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
+				clip(texcol.a * i.uvAndAlpha.a - _Cutoff);
 				SHADOW_CASTER_FRAGMENT(i)
 			}
 			ENDCG

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

@@ -179,15 +179,17 @@ Shader "Spine/Skeleton Lit" {
 			#include "UnityCG.cginc"
 			struct v2f { 
 				V2F_SHADOW_CASTER;
-				float2  uv : TEXCOORD1;
+				float4 uvAndAlpha : TEXCOORD1;
 			};
 
 			uniform float4 _MainTex_ST;
 
-			v2f vert (appdata_base v) {
+			v2f vert (appdata_base v, float4 vertexColor : COLOR) {
 				v2f o;
 				TRANSFER_SHADOW_CASTER(o)
-				o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
+				o.uvAndAlpha.xy = TRANSFORM_TEX(v.texcoord, _MainTex);
+				o.uvAndAlpha.z = 0;
+				o.uvAndAlpha.a = vertexColor.a;
 				return o;
 			}
 
@@ -195,8 +197,8 @@ Shader "Spine/Skeleton Lit" {
 			uniform fixed _Cutoff;
 
 			float4 frag (v2f i) : COLOR {
-				fixed4 texcol = tex2D(_MainTex, i.uv);
-				clip(texcol.a - _Cutoff);
+				fixed4 texcol = tex2D(_MainTex, i.uvAndAlpha.xy);
+				clip(texcol.a * i.uvAndAlpha.a - _Cutoff);
 				SHADOW_CASTER_FRAGMENT(i)
 			}
 			ENDCG