Support for UnityUI RectMask2D (#9702)

* Adding UNITY_UI_CLIP_RECT support to the MRTK/Standard shader.

Author: Cameron-Micka

Assets/MRTK/SDK/Features/UX/Prefabs/Slate/SlateUGUI.prefab

@@ -352,9 +352,9 @@ GameObject:
   serializedVersion: 6
   m_Component:
   - component: {fileID: 224017967242958273}
-  - component: {fileID: 114708886606366759}
   - component: {fileID: 222065373125170189}
   - component: {fileID: 114854708881193683}
+  - component: {fileID: 4090038691019577845}
   m_Layer: 5
   m_Name: Viewport
   m_TagString: Untagged
@@ -382,19 +382,6 @@ RectTransform:
   m_AnchoredPosition: {x: 0, y: 0}
   m_SizeDelta: {x: 0, y: 0}
   m_Pivot: {x: 0, y: 1}
---- !u!114 &114708886606366759
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 1542384694952789}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: -1200242548, guid: f70555f144d8491a825f0804e09c671c, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
-  m_ShowMaskGraphic: 0
 --- !u!222 &222065373125170189
 CanvasRenderer:
   m_ObjectHideFlags: 0
@@ -430,6 +417,18 @@ MonoBehaviour:
   m_FillClockwise: 1
   m_FillOrigin: 0
   m_UseSpriteMesh: 0
+--- !u!114 &4090038691019577845
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 1542384694952789}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: -146154839, guid: f70555f144d8491a825f0804e09c671c, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
 --- !u!1 &1712204423372907
 GameObject:
   m_ObjectHideFlags: 0
@@ -2206,9 +2205,9 @@ GameObject:
   serializedVersion: 6
   m_Component:
   - component: {fileID: 6647081080591808399}
-  - component: {fileID: 703902783973535641}
   - component: {fileID: 7409808861860865596}
   - component: {fileID: 520160181843908597}
+  - component: {fileID: 910422878816264293}
   m_Layer: 5
   m_Name: Viewport
   m_TagString: Untagged
@@ -2236,19 +2235,6 @@ RectTransform:
   m_AnchoredPosition: {x: 0, y: 0}
   m_SizeDelta: {x: -18, y: 0}
   m_Pivot: {x: 0, y: 1}
---- !u!114 &703902783973535641
-MonoBehaviour:
-  m_ObjectHideFlags: 0
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 2848800613087917502}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: -1200242548, guid: f70555f144d8491a825f0804e09c671c, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
-  m_ShowMaskGraphic: 0
 --- !u!222 &7409808861860865596
 CanvasRenderer:
   m_ObjectHideFlags: 0
@@ -2284,6 +2270,18 @@ MonoBehaviour:
   m_FillClockwise: 1
   m_FillOrigin: 0
   m_UseSpriteMesh: 0
+--- !u!114 &910422878816264293
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 2848800613087917502}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: -146154839, guid: f70555f144d8491a825f0804e09c671c, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
 --- !u!1 &3059731576085144653
 GameObject:
   m_ObjectHideFlags: 0

Assets/MRTK/StandardAssets/Shaders/MRTK.Shaders.sentinel

@@ -1 +1 @@
-ver: 0
+ver: 1

Assets/MRTK/StandardAssets/Shaders/MixedRealityStandard.shader

@@ -142,6 +142,7 @@ Shader "Mixed Reality Toolkit/Standard"
 
             #pragma multi_compile_instancing
             #pragma multi_compile _ LIGHTMAP_ON
+            #pragma multi_compile _ UNITY_UI_CLIP_RECT
             #pragma multi_compile _ _HOVER_LIGHT_MEDIUM _HOVER_LIGHT_HIGH
             #pragma multi_compile _ _CLIPPING_PLANE _CLIPPING_SPHERE _CLIPPING_BOX
 
@@ -186,6 +187,7 @@ Shader "Mixed Reality Toolkit/Standard"
             #define IF(a, b, c) lerp(b, c, step((fixed) (a), 0.0)); 
 
             #include "UnityCG.cginc"
+            #include "UnityUI.cginc"
             #include "UnityStandardConfig.cginc"
             #include "UnityStandardUtils.cginc"
             #include "MixedRealityShaderUtils.cginc"
@@ -211,7 +213,13 @@ Shader "Mixed Reality Toolkit/Standard"
             #undef _WORLD_POSITION
 #endif
 
-#if defined(_ALPHATEST_ON) || defined(_CLIPPING_PRIMITIVE) || defined(_ROUND_CORNERS)
+#if defined(UNITY_UI_CLIP_RECT)
+            #define _LOCAL_POSITION
+#else
+            #undef _LOCAL_POSITION
+#endif
+
+#if defined(_ALPHATEST_ON) || defined(UNITY_UI_CLIP_RECT) || defined(_CLIPPING_PRIMITIVE) || defined(_ROUND_CORNERS)
             #define _ALPHA_CLIP
 #else
             #undef _ALPHA_CLIP
@@ -298,6 +306,9 @@ Shader "Mixed Reality Toolkit/Standard"
                 float3 worldPosition : TEXCOORD2;
 #endif
 #endif
+#if defined(_LOCAL_POSITION)
+                float3 localPosition : TEXCOORD7;
+#endif
 #if defined(_SCALE)
                 float3 scale : TEXCOORD3;
 #endif
@@ -345,6 +356,10 @@ Shader "Mixed Reality Toolkit/Standard"
             fixed _Cutoff;
 #endif
 
+#if defined(UNITY_UI_CLIP_RECT)
+            float4 _ClipRect;
+#endif
+
             fixed _Metallic;
             fixed _Smoothness;
 
@@ -623,6 +638,10 @@ Shader "Mixed Reality Toolkit/Standard"
                 o.worldPosition.xyz = worldVertexPosition;
 #endif
 
+#if defined(_LOCAL_POSITION)
+                o.localPosition.xyz = vertexPosition;
+#endif
+
 #if defined(_NEAR_PLANE_FADE)
                 float rangeInverse = 1.0 / (_FadeBeginDistance - _FadeCompleteDistance);
 #if defined(_NEAR_LIGHT_FADE)
@@ -1029,6 +1048,10 @@ Shader "Mixed Reality Toolkit/Standard"
                 pointToLight *= roundCornerClip;
 #endif
 
+#ifdef UNITY_UI_CLIP_RECT
+                albedo.a *= UnityGet2DClipping(i.localPosition.xy, _ClipRect);
+#endif
+
 #if defined(_ALPHA_CLIP)
 #if !defined(_ALPHATEST_ON)
                 _Cutoff = 0.5;