sets arm64 emulator for aarch64 macs

Author: codeanticode

mode/src/processing/mode/android/SysImageDownloader.java

@@ -386,7 +386,8 @@ public void run() {
       // Either there was no image architecture selected, or the default was set.
       // In this case, we give the user the option to choose between ARM and x86
 
-      final int result;
+      int result = 0;
+      boolean arm64 = false;
       // PROCESSOR_IDENTIFIER is only defined on Windows. For cross-platform CPU
       // info, in the future we could use OSHI: https://github.com/oshi/oshi
       String procId = System.getenv("PROCESSOR_IDENTIFIER");
@@ -399,14 +400,22 @@ public void run() {
           result = JOptionPane.NO_OPTION;
         }
       } else if (Platform.isMacOS()) {
-        // Macs only have Intel CPUs, so we also go for the x86 abi
-        result = JOptionPane.YES_OPTION;
+        if (Platform.getNativeArch().equals("aarch64")) {
+          // Apple Silicon Mac, so we go for the arm64 abi
+          arm64 = true;
+          result = JOptionPane.NO_OPTION;
+        } else {
+          // Intel Mac, so we go for the x86 abi
+          result = JOptionPane.YES_OPTION;
+        }
       } else {
         result = showSysImageMessage();  
       }
       if (result == JOptionPane.YES_OPTION || result == JOptionPane.CLOSED_OPTION) {
         abi = "x86";
         installHAXM();
+      } else if (arm64) {
+        abi = "arm64-v8a";
       } else {
         abi = "arm";        
       }