Refactor material shaders generator to use modular features as extensions

Content/Editor/MaterialTemplates/Features/MotionVectors.hlsl

@@ -0,0 +1,44 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+@0// Motion Vectors: Defines
+@1// Motion Vectors: Includes
+@2// Motion Vectors: Constants
+@3// Motion Vectors: Resources
+@4// Motion Vectors: Utilities
+@5// Motion Vectors: Shaders
+
+// Pixel Shader function for Motion Vectors Pass
+META_PS(true, FEATURE_LEVEL_ES2)
+float4 PS_MotionVectors(PixelInput input) : SV_Target0
+{
+#if USE_DITHERED_LOD_TRANSITION
+	// LOD masking
+	ClipLODTransition(input);
+#endif
+
+#if MATERIAL_MASKED
+	// Perform per pixel clipping if material requries it
+	MaterialInput materialInput = GetMaterialInput(input);
+	Material material = GetMaterialPS(materialInput);
+	clip(material.Mask - MATERIAL_MASK_THRESHOLD);
+#endif
+
+	// Calculate this and previosu frame pixel locations in clip space
+	float4 prevClipPos = mul(float4(input.Geometry.PrevWorldPosition, 1), PrevViewProjectionMatrix);
+	float4 curClipPos = mul(float4(input.Geometry.WorldPosition, 1), ViewProjectionMatrix);
+	float2 prevHPos = prevClipPos.xy / prevClipPos.w;
+	float2 curHPos = curClipPos.xy / curClipPos.w;
+
+	// Revert temporal jitter offset
+	prevHPos -= TemporalAAJitter.zw;
+	curHPos -= TemporalAAJitter.xy;
+
+	// Clip Space -> UV Space
+	float2 vPosPrev = prevHPos.xy * 0.5f + 0.5f;
+	float2 vPosCur = curHPos.xy * 0.5f + 0.5f;
+	vPosPrev.y = 1.0 - vPosPrev.y;
+	vPosCur.y = 1.0 - vPosCur.y;
+
+	// Calculate per-pixel motion vector
+	return float4(vPosCur - vPosPrev, 0, 1);
+}

Content/Editor/MaterialTemplates/Features/Tessellation.hlsl

@@ -32,14 +32,13 @@ struct TessalationDSToPS
 
 MaterialInput GetMaterialInput(TessalationDSToPS input)
 {
-	MaterialInput result = (MaterialInput)0;
-	result.SvPosition = input.Position;
-	GetGeometryMaterialInput(result, input.Geometry);
-	result.TwoSidedSign = WorldDeterminantSign;
+	MaterialInput output = GetGeometryMaterialInput(input.Geometry);
+	output.SvPosition = input.Position;
+	output.TwoSidedSign = WorldDeterminantSign;
 #if USE_CUSTOM_VERTEX_INTERPOLATORS
-	result.CustomVSToPS = input.CustomVSToPS;
+	output.CustomVSToPS = input.CustomVSToPS;
 #endif
-	return result;
+	return output;
 }
 
 struct TessalationPatch