(Android) Add in code to set refresh rate to that of the device's

refresh rate in case display screen has a refresh rate lower than
60Hz - ie. 58.2Hz/59.0Hz - is ifdeffed specifically for PHOENIX_LEGACY
- new Phoenix frontend needs to do pass the refresh rate of the screen
determined in the Java frontend to the native activity - see phoenix-legacy
code

android/native/jni/android_general.h

@@ -37,6 +37,7 @@ struct droid
    int32_t last_orient;
    unsigned reinit_video;
    unsigned activity_paused;
+   float disp_refresh_rate;
 };
 
 extern struct droid g_android;

android/native/jni/main.c

@@ -26,6 +26,10 @@
 #include "../../../performance.h"
 #include "../../../driver.h"
 
+#ifdef PHOENIX_LEGACY
+#include "../../../config.def.h"
+#endif
+
 void free_saved_state(struct android_app* android_app)
 {
    pthread_mutex_lock(&android_app->mutex);
@@ -334,12 +338,21 @@ static void* android_app_entry(void* param)
    // Get arguments */
    android_get_char_argv(rom_path, sizeof(rom_path), "ROM");
    android_get_char_argv(libretro_path, sizeof(libretro_path), "LIBRETRO");
+#ifdef PHOENIX_LEGACY
+   char refreshrate_char[128];
+   float refreshrate;
+
+   android_get_char_argv(refreshrate_char,sizeof(refreshrate_char), "REFRESHRATE");
+
+   refreshrate = (float)strtod(refreshrate_char, NULL);
+#endif
 
    RARCH_LOG("Checking arguments passed...\n");
    RARCH_LOG("ROM Filename: [%s].\n", rom_path);
    RARCH_LOG("Libretro path: [%s].\n", libretro_path);
-
 #ifdef PHOENIX_LEGACY
+   RARCH_LOG("Display Refresh rate: %.2fHz.\n", refreshrate);
+
    /* ugly hack for now - hardcode libretro path to 'allowed' dir */
    snprintf(libretro_path, sizeof(libretro_path), "/data/data/com.retroarch/lib/libretro.so");
 #endif
@@ -377,6 +390,23 @@ static void* android_app_entry(void* param)
 
    g_extern.verbose = true;
 
+#ifdef PHOENIX_LEGACY
+   bool disp_refresh_read = refreshrate > 0.0f;
+
+   g_android.disp_refresh_rate = refresh_rate;
+
+   if(disp_refresh_read)
+   {
+      if(refreshrate < refresh_rate)
+      {
+         RARCH_WARN("Display refresh rate of your device is likely lower than 60Hz.\n");
+         g_android.disp_refresh_rate = refreshrate;
+      }
+   }
+
+   RARCH_LOG("Setting RetroArch video refresh rate to: %.2fHz.\n", g_android.disp_refresh_rate);
+#endif
+
    while(!(g_android.input_state & (1ULL << RARCH_WINDOW_READY)))
    {
       if(!android_run_events(android_app))

android/phoenix-legacy/src/com/retroarch/phoenix.java

@@ -21,10 +21,13 @@ import com.retroarch.fileio.FileChooser;
 
 import android.app.Activity;
 import android.app.NativeActivity;
+import android.content.Context;
 import android.content.Intent;
+import android.view.Display;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
+import android.view.WindowManager;
 import android.widget.Toast;
 import android.os.Bundle;
 
@@ -50,6 +53,14 @@ public class phoenix extends Activity
     	return true;
     }
     
+    public float getRefreshRate()
+    {
+    	final WindowManager wm = (WindowManager)getSystemService(Context.WINDOW_SERVICE);
+    	final Display display = wm.getDefaultDisplay();
+    	float rate = display.getRefreshRate();
+    	return rate;
+    }
+    
     public boolean onOptionsItemSelected(MenuItem item)
     {
     	Intent myIntent;
@@ -91,6 +102,7 @@ public class phoenix extends Activity
     				   myIntent = new Intent(this, NativeActivity.class);
     				   myIntent.putExtra("ROM", data.getStringExtra("PATH"));
     				   myIntent.putExtra("LIBRETRO", libretro_path);
+    				   myIntent.putExtra("REFRESHRATE", Float.toString(getRefreshRate()));
     				   startActivity(myIntent);
     			   }
     			   else

settings.c

@@ -189,7 +189,13 @@ void config_set_defaults(void)
    g_settings.video.second_pass_smooth = second_pass_smooth;
 #endif
 
+   // Android screens can have variable refresh rates - don't set a 
+   // hardcoded value for Android devices
+#if defined(ANDROID) && defined(PHOENIX_LEGACY)
+   g_settings.video.refresh_rate = g_android.disp_refresh_rate;
+#else
    g_settings.video.refresh_rate = refresh_rate;
+#endif
    g_settings.video.post_filter_record = post_filter_record;
    g_settings.video.gpu_record = gpu_record;
    g_settings.video.gpu_screenshot = gpu_screenshot;