[GLTFExporter] refactor: add FGLTFPackedVector8 and FGLTFPackedVector16

commit 701e4e07e0889bc20793bc64de0b3600bebdac67
Author: Aidin Abedi <aidin.abedi[at]animech.com>
Date: Sun, 27 Sep 2020 22:38:02 +0200

    refactor: add FGLTFPackedVector8 and FGLTFPackedVector16
    (cherry picked from commit c4793dfde04c55e2dc9b639aef13b98d717a0a97​)

#preflight none
#skipci

[CL 21635497 by aidinabedi in ue5-main branch]

Engine/Plugins/Enterprise/GLTFExporter/MigratedFromGit/Source/GLTFExporter/Private/Converters/GLTFPackedTypes.h

@@ -8,10 +8,32 @@
 // glTF uses RGBA independent of endianness, hence why we need this dedicated struct
 struct FGLTFPackedColor
 {
-	uint8 R,G,B,A;
+	uint8 R, G, B, A;
 
 	FGLTFPackedColor(uint8 R, uint8 G, uint8 B, uint8 A = 255)
 		: R(R), G(G), B(B), A(A)
 	{
 	}
 };
+
+// Primarily for type-safety
+struct FGLTFPackedVector8
+{
+	int8 X, Y, Z, W;
+
+	FGLTFPackedVector8(int8 X, int8 Y, int8 Z, int8 W = 0)
+        : X(X), Y(Y), Z(Z), W(W)
+	{
+	}
+};
+
+// Primarily for type-safety
+struct FGLTFPackedVector16
+{
+	int16 X, Y, Z, W;
+
+	FGLTFPackedVector16(int16 X, int16 Y, int16 Z, int16 W = 0)
+        : X(X), Y(Y), Z(Z), W(W)
+	{
+	}
+};