浏览器嵌入，国旗文件

Assets/Resources/Circle/ShaderSetup.cginc

@@ -0,0 +1,25 @@
+struct appdata {
+    float4 vertex : POSITION;
+    float2 uv : TEXCOORD0;
+    float4 color : COLOR;  // set from Image component property
+};
+
+struct v2f {
+    float2 uv : TEXCOORD0;
+    float4 vertex : SV_POSITION;
+    float4 color : COLOR;
+};
+
+v2f vert (appdata v) {
+    v2f o;
+    o.vertex = UnityObjectToClipPos(v.vertex);
+    o.uv = v.uv;
+    o.color = v.color;
+    return o;
+}
+
+inline fixed4 mixAlpha(fixed4 mainTexColor, fixed4 color, float sdfAlpha){
+    fixed4 col = mainTexColor * color;
+    col.a = min(col.a, sdfAlpha);
+    return col;
+}