Init

Assets/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_ScreenPosInputsNode.shader

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+Shader "Hidden/ScreenPosInputsNode"
+{
+	SubShader
+	{
+		CGINCLUDE
+			#include "UnityCG.cginc"
+			#include "Preview.cginc"
+			#pragma vertex vert_img
+			#pragma fragment frag
+
+			uniform float4 _ASEPreviewSize;
+
+			inline float4 CalculateScreenPos( float2 uv, bool norm = true, float z = 0.01 )
+			{
+				float2 xy = 2 * uv - 1;
+				float3 vertexPos = float3( xy, z );
+				float4x4 P = float4x4( 1, 0, 0, 0, 0, -1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 ); //UNITY_MATRIX_P
+				float4x4 V = UNITY_MATRIX_V; //float4x4(1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1); //UNITY_MATRIX_V
+				float4x4 M = unity_ObjectToWorld; //float4x4(1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1); //unity_ObjectToWorld
+				float4x4 VPmatrix = mul( P, V );
+				float4 clipPos = mul( VPmatrix, mul( M, float4( vertexPos, 1.0 ) ) ); //same as object to clip pos
+				float4 screenPos = ComputeScreenPos( clipPos );
+				screenPos = norm ? screenPos / screenPos.w : screenPos;
+				return screenPos;
+			}
+		ENDCG
+
+		// Normalized
+		Pass
+		{
+			CGPROGRAM
+				float4 frag( v2f_img i ) : SV_Target
+				{
+					return CalculateScreenPos( i.uv );
+				}
+			ENDCG
+		}
+
+		// Raw
+		Pass
+		{
+			CGPROGRAM
+				float4 frag( v2f_img i ) : SV_Target
+				{
+					return CalculateScreenPos( i.uv, false, 0.99 );
+				}
+			ENDCG
+		}
+
+		// Center
+		Pass
+		{
+			CGPROGRAM
+				float4 frag( v2f_img i ) : SV_Target
+				{
+					float4 screenPos = CalculateScreenPos( i.uv );
+					return float4( screenPos.xy * 2 - 1, 0, 0 );
+				}
+			ENDCG
+		}
+
+		// Tiled
+		Pass
+		{
+			CGPROGRAM
+				float4 frag( v2f_img i ) : SV_Target
+				{
+					float4 screenPos = CalculateScreenPos( i.uv );
+					return frac( float4( ( screenPos.x * 2 - 1 ) * _ASEPreviewSize.x / _ASEPreviewSize.y, screenPos.y * 2 - 1, 0, 0 ) );
+				}
+			ENDCG
+		}
+
+		// Screen
+		Pass
+		{
+			CGPROGRAM
+				float4 frag( v2f_img i ) : SV_Target
+				{
+					float4 screenPos = CalculateScreenPos( i.uv );
+					screenPos.xy *= _ASEPreviewSize.xy;
+				#if UNITY_UV_STARTS_AT_TOP
+					screenPos.xy = float2( screenPos.x, ( _ProjectionParams.x < 0 ) ? _ASEPreviewSize.y - screenPos.y : screenPos.y );
+				#else
+					screenPos.xy = float2( screenPos.x, ( _ProjectionParams.x > 0 ) ? _ASEPreviewSize.y - screenPos.y : screenPos.y );
+				#endif
+					return float4( screenPos.xy, 0, 0 );
+				}
+			ENDCG
+		}
+	}
+}