[Android] Add support for sterescopy configuration.

This menu allows us to configure the stereoscopy video settings if the device supports it.
This menu is only enabled if the hardware supports everything needed to use the feature.

Source/Android/res/layout/slider_layout.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:orientation="vertical"
+              android:layout_width="match_parent"
+              android:layout_height="match_parent"
+              android:weightSum="1"
+              android:gravity="center_horizontal">
+
+	<SeekBar
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:id="@+id/seekBar"
+		/>
+
+	<TextView
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:text="New Text"
+		android:id="@+id/textView"
+		android:textStyle="bold"/>
+
+</LinearLayout>

Source/Android/res/values/arrays.xml

@@ -155,5 +155,18 @@
         <item>3</item>
         <item>4</item>
     </string-array>
-    
+
+    <!-- Stereoscopy Preference -->
+    <string-array name="stereoscopyEntries" translatable="false">
+        <item>Off</item>
+        <item>Side-by-Side</item>
+        <item>Top-and-Bottom</item>
+        <item>Anaglyph</item>
+    </string-array>
+    <string-array name="stereoscopyValues" translatable="false">
+        <item>0</item>
+        <item>1</item>
+        <item>2</item>
+        <item>3</item>
+    </string-array>
 </resources>

Source/Android/res/values/strings.xml

@@ -174,6 +174,16 @@
     <string name="force_texture_filtering_descrip">Force texture filtering even if the emulated game explicitly disabled it. Improves texture quality slightly but causes glitches in some games.</string>
     <string name="disable_fog">Disable Fog</string>
     <string name="disable_fog_descrip">Makes distant objects more visible by removing fog, thus increasing the overall detail. Disabling fog will break some games which rely on proper fog emulation.</string>
+    <string name="stereoscopy">Stereoscopy</string>
+    <string name="stereoscopy_descrip">Stereoscopy allows you to get a better feeling of depth if you have the necessary hardware.\nHeavily decreases emulation speed and sometimes causes issues</string>
+    <string name="stereoscopy_mode">Stereoscopy Mode</string>
+    <string name="stereoscopy_mode_descrip">Select the stereoscopic 3D mode.</string>
+    <string name="sterescopy_depth">Depthn</string>
+    <string name="sterescopy_depth_descrip">Control the distance between the virtual cameras.\nA higher value creates a stronger feeling of depth while a lower value is more comfortable.</string>
+    <string name="convergence">Convergence</string>
+    <string name="convergence_descrip">Control the distance of the convergence plane, this is the distance at which objects will appear to be in front of the screen.\nA higher value creates stronger out-of-screen effects while a lower value is more comfortable.</string>
+    <string name="swap_eyes">Swap Eyes</string>
+    <string name="swap_eyes_descrip">Swap the left and right eye, mostly useful if you want to view side-by-side cross-eyed.</string>
 
     <string name="hacks">Hacks</string>
     <string name="embedded_frame_buffer">Embedded Frame Buffer</string>

Source/Android/res/xml/video_prefs.xml

@@ -57,6 +57,38 @@
             android:summary="@string/disable_fog_descrip"
             android:title="@string/disable_fog"/>
 
+		<PreferenceScreen
+			android:title="@string/stereoscopy"
+			android:key="StereoscopyScreen"
+			android:summary="@string/stereoscopy_descrip">
+
+			<ListPreference
+				android:entries="@array/stereoscopyEntries"
+				android:entryValues="@array/stereoscopyValues"
+				android:key="stereoscopyMode"
+				android:summary="@string/stereoscopy_mode_descrip"
+				android:title="@string/stereoscopy_mode"/>
+
+			<org.dolphinemu.dolphinemu.utils.SliderPreference
+				android:defaultValue="20"
+				android:key="stereoDepth"
+				android:max="100"
+				android:summary="@string/sterescopy_depth_descrip"
+				android:title="@string/sterescopy_depth" />
+
+			<org.dolphinemu.dolphinemu.utils.SliderPreference
+				android:defaultValue="20"
+				android:key="stereoConvergence"
+				android:max="500"
+				android:summary="@string/convergence_descrip"
+				android:title="@string/convergence" />
+
+			<CheckBoxPreference
+				android:defaultValue="false"
+				android:key="stereoSwapEyes"
+				android:summary="@string/swap_eyes_descrip"
+				android:title="@string/swap_eyes"/>
+		</PreferenceScreen>
     </PreferenceScreen>
 
     <!-- Video Hacks -->

Source/Android/src/org/dolphinemu/dolphinemu/settings/UserPreferences.java

@@ -57,6 +57,10 @@ public final class UserPreferences
 		editor.putBoolean("disableFog",            getConfig("gfx_opengl.ini", "Settings", "DisableFog", "False").equals("True"));
 		editor.putBoolean("skipEFBAccess",         getConfig("gfx_opengl.ini", "Hacks", "EFBAccessEnable", "False").equals("True"));
 		editor.putBoolean("ignoreFormatChanges",   getConfig("gfx_opengl.ini", "Hacks", "EFBEmulateFormatChanges", "False").equals("False"));
+		editor.putString("stereoscopyMode", getConfig("gfx_opengl.ini", "Enhancements", "StereoMode", "0"));
+		editor.putBoolean("stereoSwapEyes",        getConfig("gfx_opengl.ini", "Enhancements", "StereoSwapEyes", "False").equals("True"));
+		editor.putString("stereoDepth",            getConfig("gfx_opengl.ini", "Enhancements", "StereoDepth", "20"));
+		editor.putString("stereoConvergence",      getConfig("gfx_opengl.ini", "Enhancements", "StereoConvergence", "20"));
 
 		String efbCopyOn     = getConfig("gfx_opengl.ini", "Hacks", "EFBCopyEnable", "True");
 		String efbToTexture  = getConfig("gfx_opengl.ini", "Hacks", "EFBToTextureEnable", "True");
@@ -182,6 +186,17 @@ public final class UserPreferences
 		// Whether or not fog is disabled.
 		boolean fogIsDisabled = prefs.getBoolean("disableFog", false);
 
+		// Stereoscopy setting
+		String stereoscopyMode = prefs.getString("stereoscopyMode", "0");
+
+		// Stereoscopy swap eyes
+		boolean stereoscopyEyeSwap = prefs.getBoolean("stereoSwapEyes", false);
+
+		// Stereoscopy separation
+		String stereoscopySeparation = prefs.getString("stereoDepth", "20");
+
+		// Stereoscopy convergence
+		String stereoscopyConvergence = prefs.getString("stereoConvergence", "20");
 
 		// CPU related Settings
 		NativeLibrary.SetConfig("Dolphin.ini", "Core", "CPUCore", currentEmuCore);
@@ -251,5 +266,9 @@ public final class UserPreferences
 		NativeLibrary.SetConfig("gfx_opengl.ini", "Settings", "EnablePixelLighting", usingPerPixelLighting ? "True" : "False");
 		NativeLibrary.SetConfig("gfx_opengl.ini", "Enhancements", "ForceFiltering", isForcingTextureFiltering ? "True" : "False");
 		NativeLibrary.SetConfig("gfx_opengl.ini", "Settings", "DisableFog", fogIsDisabled ? "True" : "False");
+		NativeLibrary.SetConfig("gfx_opengl.ini", "Enhancements", "StereoMode", stereoscopyMode);
+		NativeLibrary.SetConfig("gfx_opengl.ini", "Enhancements", "StereoSwapEyes", stereoscopyEyeSwap ? "True" : "False");
+		NativeLibrary.SetConfig("gfx_opengl.ini", "Enhancements", "StereoDepth", stereoscopySeparation);
+		NativeLibrary.SetConfig("gfx_opengl.ini", "Enhancements", "StereoConvergence", stereoscopyConvergence);
 	}
 }

Source/Android/src/org/dolphinemu/dolphinemu/settings/video/VideoSettingsFragment.java

@@ -121,6 +121,15 @@ public final class VideoSettingsFragment extends PreferenceFragment
 			mainScreen.getPreference(0).setEnabled(true);
 			mainScreen.getPreference(1).setEnabled(true);
 			mainScreen.getPreference(3).setEnabled(true);
+
+			// Check if we support stereo
+			// If we support desktop GL then we must support at least OpenGL 3.2
+			// If we only support OpenGLES then we need both OpenGLES 3.1 and AEP
+			if ((eglHelper.supportsOpenGL() && eglHelper.GetVersion() >= 320) ||
+			    (eglHelper.supportsGLES3() && eglHelper.GetVersion() >= 310 && eglHelper.SupportsExtension("GL_ANDROID_extension_pack_es31a")))
+				mainScreen.findPreference("StereoscopyScreen").setEnabled(true);
+			else
+				mainScreen.findPreference("StereoscopyScreen").setEnabled(false);
 		}
 
 		// Also set a listener, so that if someone changes the video backend, it will disable

Source/Android/src/org/dolphinemu/dolphinemu/utils/SliderPreference.java

@@ -0,0 +1,97 @@
+package org.dolphinemu.dolphinemu.utils;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.os.Bundle;
+import android.preference.DialogPreference;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.Button;
+import android.widget.LinearLayout;
+import android.widget.SeekBar;
+import android.widget.TextView;
+
+import org.dolphinemu.dolphinemu.R;
+
+public class SliderPreference extends DialogPreference implements SeekBar.OnSeekBarChangeListener, View.OnClickListener
+{
+	private static final String androidns = "http://schemas.android.com/apk/res/android";
+
+	private Context m_context;
+
+	// SeekBar
+	private int m_max, m_value;
+	private SeekBar m_seekbar;
+
+	// TextView
+	private TextView m_textview;
+
+	public SliderPreference(Context context, AttributeSet attrs)
+	{
+		super(context,attrs);
+		m_context = context;
+
+		// Seekbar values
+		m_value = attrs.getAttributeIntValue(androidns, "defaultValue", 0);
+		m_max = attrs.getAttributeIntValue(androidns, "max", 100);
+	}
+
+	@Override
+	protected View onCreateDialogView()
+	{
+		LayoutInflater inflater = LayoutInflater.from(m_context);
+		LinearLayout layout = (LinearLayout)inflater.inflate(R.layout.slider_layout, null, false);
+
+		m_seekbar = (SeekBar)layout.getChildAt(0);
+		m_textview = (TextView)layout.getChildAt(1);
+
+		if (shouldPersist())
+			m_value = Integer.valueOf(getPersistedString(Integer.toString(m_value)));
+
+		m_seekbar.setMax(m_max);
+		m_seekbar.setProgress(m_value);
+		setProgressText(m_value);
+		m_seekbar.setOnSeekBarChangeListener(this);
+
+		return layout;
+	}
+
+	// SeekBar overrides
+	@Override
+	public void onProgressChanged(SeekBar seek, int value, boolean fromTouch)
+	{
+		m_value = value;
+		setProgressText(value);
+	}
+
+	@Override
+	public void onStartTrackingTouch(SeekBar seek) {}
+	@Override
+	public void onStopTrackingTouch(SeekBar seek) {}
+
+	void setProgressText(int value)
+	{
+		m_textview.setText(String.valueOf(value));
+	}
+
+	@Override
+	public void showDialog(Bundle state) {
+
+		super.showDialog(state);
+
+		Button positiveButton = ((AlertDialog) getDialog()).getButton(AlertDialog.BUTTON_POSITIVE);
+		positiveButton.setOnClickListener(this);
+	}
+
+	@Override
+	public void onClick(View v) {
+		if (shouldPersist())
+		{
+			persistString(Integer.toString(m_seekbar.getProgress()));
+			callChangeListener(m_seekbar.getProgress());
+		}
+		((AlertDialog) getDialog()).dismiss();
+	}
+}