make some flags shader_feature to reduce the number of shader variants.

Assets/uDesktopDuplication/Shaders/uDD_Standard.shader

@@ -25,13 +25,13 @@ SubShader
 
     #pragma target 3.0
     #pragma surface surf Standard fullforwardshadows vertex:vert
-    #pragma multi_compile ___ INVERT_X
-    #pragma multi_compile ___ INVERT_Y
+    #pragma shader_feature ___ INVERT_X
+    #pragma shader_feature ___ INVERT_Y
+    #pragma shader_feature _FORWARD_Y _FORWARD_Z
+    #pragma shader_feature ___ USE_GAMMA_TO_LINEAR_SPACE
     #pragma multi_compile ___ ROTATE90 ROTATE180 ROTATE270
     #pragma multi_compile ___ USE_CLIP
     #pragma multi_compile ___ BEND_ON
-    #pragma multi_compile _FORWARD_Y _FORWARD_Z
-    #pragma multi_compile ___ USE_GAMMA_TO_LINEAR_SPACE
 
     #define SURFACE_SHADER
     #include "./uDD_Common.cginc"

Assets/uDesktopDuplication/Shaders/uDD_Unlit.shader

@@ -49,13 +49,13 @@ Pass
     CGPROGRAM
     #pragma vertex vert
     #pragma fragment frag
-    #pragma multi_compile ___ INVERT_X
-    #pragma multi_compile ___ INVERT_Y
+    #pragma shader_feature ___ INVERT_X
+    #pragma shader_feature ___ INVERT_Y
+    #pragma shader_feature _FORWARD_Y _FORWARD_Z
+    #pragma shader_feature ___ USE_GAMMA_TO_LINEAR_SPACE
     #pragma multi_compile ___ ROTATE90 ROTATE180 ROTATE270
     #pragma multi_compile ___ USE_CLIP
     #pragma multi_compile ___ BEND_ON
-    #pragma multi_compile _FORWARD_Y _FORWARD_Z
-    #pragma multi_compile ___ USE_GAMMA_TO_LINEAR_SPACE
     ENDCG
 }
 

Assets/uDesktopDuplication/Shaders/uDD_Unlit_BlackMask.shader

@@ -55,13 +55,13 @@ Pass
     CGPROGRAM
     #pragma vertex vert
     #pragma fragment frag
-    #pragma multi_compile ___ INVERT_X
-    #pragma multi_compile ___ INVERT_Y
+    #pragma shader_feature ___ INVERT_X
+    #pragma shader_feature ___ INVERT_Y
+    #pragma shader_feature _FORWARD_Y _FORWARD_Z
+    #pragma shader_feature ___ USE_GAMMA_TO_LINEAR_SPACE
     #pragma multi_compile ___ ROTATE90 ROTATE180 ROTATE270
     #pragma multi_compile ___ USE_CLIP
     #pragma multi_compile ___ BEND_ON
-    #pragma multi_compile _FORWARD_Y _FORWARD_Z
-    #pragma multi_compile ___ USE_GAMMA_TO_LINEAR_SPACE
     ENDCG
 }
 

Assets/uDesktopDuplication/Shaders/uDD_Unlit_Displacement.shader

@@ -162,13 +162,13 @@ Pass
     #pragma fragment frag
     #pragma hull hull
     #pragma domain domain
-    #pragma multi_compile ___ INVERT_X
-    #pragma multi_compile ___ INVERT_Y
+    #pragma shader_feature ___ INVERT_X
+    #pragma shader_feature ___ INVERT_Y
+    #pragma shader_feature _FORWARD_Y _FORWARD_Z
+    #pragma shader_feature ___ USE_GAMMA_TO_LINEAR_SPACE
     #pragma multi_compile ___ ROTATE90 ROTATE180 ROTATE270
     #pragma multi_compile ___ USE_CLIP
     #pragma multi_compile ___ BEND_ON
-    #pragma multi_compile _FORWARD_Y _FORWARD_Z
-    #pragma multi_compile ___ USE_GAMMA_TO_LINEAR_SPACE
     ENDCG
 }
 

Assets/uDesktopDuplication/Shaders/uDD_Unlit_Transparent.shader

@@ -51,13 +51,13 @@ Pass
     CGPROGRAM
     #pragma vertex vert
     #pragma fragment frag
-    #pragma multi_compile ___ INVERT_X
-    #pragma multi_compile ___ INVERT_Y
+    #pragma shader_feature ___ INVERT_X
+    #pragma shader_feature ___ INVERT_Y
+    #pragma shader_feature _FORWARD_Y _FORWARD_Z
+    #pragma shader_feature ___ USE_GAMMA_TO_LINEAR_SPACE
     #pragma multi_compile ___ ROTATE90 ROTATE180 ROTATE270
     #pragma multi_compile ___ USE_CLIP
     #pragma multi_compile ___ BEND_ON
-    #pragma multi_compile _FORWARD_Y _FORWARD_Z
-    #pragma multi_compile ___ USE_GAMMA_TO_LINEAR_SPACE
     ENDCG
 }