Add text multisampling option. (#201)

Author: Cameron-Micka

com.microsoft.mrtk.graphicstools.shadergraph.unity/package.json

@@ -1,6 +1,6 @@
 {
   "name": "com.microsoft.mrtk.graphicstools.shadergraph.unity",
-  "version": "0.6.2",
+  "version": "0.6.5",
   "displayName": "MRTK Graphics Tools Shader Graph",
   "description": "Graphics tools and components for developing Mixed Reality applications in Unity Shader Graph.",  
   "documentationUrl": "https://aka.ms/mrtk3graphics",

com.microsoft.mrtk.graphicstools.unity/Editor/ShaderGUIs/TextMeshProShaderGUI.cs

@@ -16,6 +16,14 @@ public class TextMeshProShaderGUI : TMP_SDFShaderGUI
     {
         private static bool doMode = true;
 
+        private static readonly ShaderFeature s_MultiSampleFeature = new()
+        {
+            label = new GUIContent("Multisample"),
+            undoLabel = "Multisample",
+            keywords = new[] { "MULTISAMPLE_ON" },
+            keywordLabels = new[] { new GUIContent("Off"), new GUIContent("On") }
+        };
+
         /// <inheritdoc/>
         protected override void DoGUI()
         {
@@ -27,6 +35,11 @@ protected override void DoGUI()
             EndPanel();
 
             base.DoGUI();
+
+            // Do Popup was behaving oddly, default to doing it more manually
+            s_MultiSampleFeature.ReadState(m_Material);
+            bool newValue = EditorGUILayout.Toggle("Multisample", s_MultiSampleFeature.Active);
+            s_MultiSampleFeature.SetActive(newValue, m_Material);
         }
 
         /// <inheritdoc/>

com.microsoft.mrtk.graphicstools.unity/Runtime/Shaders/GraphicsToolsTextMeshPro.shader

@@ -106,6 +106,7 @@ SubShader {
         #pragma fragment PixShader
         #pragma shader_feature_local __ OUTLINE_ON
         #pragma shader_feature_local __ UNDERLAY_ON UNDERLAY_INNER
+        #pragma shader_feature_local __ MULTISAMPLE_ON
 
         #pragma multi_compile_local _ UNITY_UI_CLIP_RECT
         #pragma multi_compile_local _ _UI_CLIP_RECT_ROUNDED _UI_CLIP_RECT_ROUNDED_INDEPENDENT
@@ -323,13 +324,30 @@ CBUFFER_END
             return output;
         }
 
+        float4 Tex2DMultisample(sampler2D tex, float2 uv)
+        {
+            float2 dx = ddx(uv) * 0.25;
+            float2 dy = ddy(uv) * 0.25;
+
+            float4 sample0 = tex2D(tex, uv + dx + dy);
+            float4 sample1 = tex2D(tex, uv + dx - dy);
+            float4 sample2 = tex2D(tex, uv - dx + dy);
+            float4 sample3 = tex2D(tex, uv - dx - dy);
+        
+            return (sample0 + sample1 + sample2 + sample3) * 0.25;
+        }
 
         // PIXEL SHADER
         fixed4 PixShader(pixel_t input) : SV_Target
         {
             UNITY_SETUP_INSTANCE_ID(input);
 
+            #if MULTISAMPLE_ON
+            half d = Tex2DMultisample(_MainTex, input.texcoord0.xy).a * input.param.x;
+            #else
             half d = tex2D(_MainTex, input.texcoord0.xy).a * input.param.x;
+            #endif
+
             half4 c = input.faceColor * saturate(d - input.param.w);
 
             #ifdef OUTLINE_ON

com.microsoft.mrtk.graphicstools.unity/package.json

@@ -1,6 +1,6 @@
 {
   "name": "com.microsoft.mrtk.graphicstools.unity",
-  "version": "0.6.3",
+  "version": "0.6.5",
   "displayName": "MRTK Graphics Tools",
   "description": "Graphics tools and components for developing Mixed Reality applications in Unity.",
   "documentationUrl": "https://aka.ms/mrtk3graphics",