Wireframe ( Geometry shader version )

Author: przemyslawzaworski

GeometryShaders/Wireframe.shader

@@ -0,0 +1,45 @@
+Shader "Wireframe (Geometry Shader)"
+{
+	SubShader
+	{
+		Tags { "RenderType" = "Transparent" "Queue" = "Transparent" }
+		Pass
+		{
+			Blend SrcAlpha OneMinusSrcAlpha
+			CGPROGRAM
+			#pragma vertex VSMain
+			#pragma geometry GSMain
+			#pragma fragment PSMain
+			#pragma target 5.0
+
+			struct Data
+			{
+				float4 vertex : SV_Position;
+				float2 barycentric : BARYCENTRIC;
+			};
+
+			void VSMain(inout float4 vertex:POSITION) { }
+
+			[maxvertexcount(3)] 
+			void GSMain( triangle float4 patch[3]:SV_Position, inout TriangleStream<Data> stream)
+			{
+				Data GS;
+				for (uint i = 0; i < 3; i++)
+				{
+					GS.vertex = UnityObjectToClipPos(patch[i]);
+					GS.barycentric = float2(fmod(i,2.0), step(2.0,i));
+					stream.Append(GS);
+				}
+				stream.RestartStrip();
+			}
+
+			float4 PSMain(Data PS) : SV_Target
+			{
+				float3 coord = float3(PS.barycentric, 1.0 - PS.barycentric.x - PS.barycentric.y);
+				coord = smoothstep(fwidth(coord)*0.1, fwidth(coord)*0.1 + fwidth(coord), coord);
+				return float4(0..xxx, 1.0 - min(coord.x, min(coord.y, coord.z)));
+			}
+			ENDCG
+		}
+	}
+}