update headers

ios/include/filament/Options.h

@@ -390,6 +390,14 @@ struct VsmShadowOptions {
      */
     bool mipmapping = false;
 
+    /**
+     * Whether to use a 32-bits or 16-bits texture format for VSM shadow maps. 32-bits
+     * precision is rarely needed, but it does reduces light leaks as well as "fading"
+     * of the shadows in some situations. Setting highPrecision to true for a single
+     * shadow map will double the memory usage of all shadow maps.
+     */
+    bool highPrecision = false;
+
     /**
      * VSM minimum variance scale, must be positive.
      */