1 files changed, 62 insertions, 0 deletions
diff --git a/Assets/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_ScreenPosInputsNode.shader b/Assets/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_ScreenPosInputsNode.shader
new file mode 100644
index 00000000..4c0338c4
--- /dev/null
+++ b/Assets/AmplifyShaderEditor/Plugins/EditorResources/Previews/Preview_ScreenPosInputsNode.shader
@@ -0,0 +1,62 @@
+Shader "Hidden/ScreenPosInputsNode"
+{
+	SubShader
+	{
+		CGINCLUDE
+			#include "UnityCG.cginc"
+			inline float4 PrevComputeNonStereoScreenPos (float4 pos) {
+				float4 o = pos * 0.5f;
+				o.xy = float2(o.x, o.y*_ProjectionParams.x) + o.w;
+				o.zw = pos.zw;
+				return o;
+			}
+
+			inline float4 CalculateScreenPos (float2 uv)
+			{
+				float2 xy = 2 * uv - 1;
+				float z = -sqrt (1 - saturate (dot (xy,xy)));
+				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);
+				return screenPos;
+			}
+		ENDCG
+
+		//Normalized
+		Pass
+		{
+			CGPROGRAM
+			#pragma vertex vert_img
+			#pragma fragment frag
+			
+
+			float4 frag( v2f_img i ) : SV_Target
+			{
+				return CalculateScreenPos(i.uv);
+			}
+			ENDCG
+		}
+
+		//Screen
+		Pass
+		{
+			CGPROGRAM
+			#pragma vertex vert_img
+			#pragma fragment frag
+
+			uniform float4 _ASEPreviewSize;
+
+			float4 frag (v2f_img i) : SV_Target
+			{
+				float4 screenPos = CalculateScreenPos (i.uv);
+				screenPos.xy *= _ASEPreviewSize.xy;
+				return screenPos;
+			}
+			ENDCG
+		}
+	}
+}