Converted ShatteredPD to Build from Gradle

Major Changes:
- Shattered now builds effortlessly either from gradle CLI or android studio
- Much better dependency management through gradle (although it's not really used atm)
- Separate PD-classes repo is now SPD-classes module within main repo

SPD-classes/src/main/java/com/watabou/gltextures/TextureCache.java

@@ -0,0 +1,164 @@
+/*
+ * Pixel Dungeon
+ * Copyright (C) 2012-2015  Oleg Dolya
+ *
+ * Shattered Pixel Dungeon
+ * Copyright (C) 2014-2016 Evan Debenham
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+package com.watabou.gltextures;
+
+import java.util.HashMap;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.graphics.Canvas;
+import android.graphics.LinearGradient;
+import android.graphics.Paint;
+import android.graphics.Shader.TileMode;
+
+import com.watabou.glwrap.Texture;
+
+public class TextureCache {
+
+	public static Context context;
+	
+	private static HashMap<Object,SmartTexture> all = new HashMap<>();
+	
+	// No dithering, no scaling, 32 bits per pixel
+	private static BitmapFactory.Options bitmapOptions = new BitmapFactory.Options();
+	static {
+		bitmapOptions.inScaled = false;
+		bitmapOptions.inDither = false;
+		bitmapOptions.inPreferredConfig = Bitmap.Config.ARGB_8888;
+	}
+
+	public static SmartTexture createSolid( int color ) {
+		final String key = "1x1:" + color;
+		
+		if (all.containsKey( key )) {
+			
+			return all.get( key );
+			
+		} else {
+		
+			Bitmap bmp = Bitmap.createBitmap( 1, 1, Bitmap.Config.ARGB_8888 );
+			bmp.eraseColor( color );
+			
+			SmartTexture tx = new SmartTexture( bmp );
+			all.put( key, tx );
+			
+			return tx;
+		}
+	}
+	
+	public static SmartTexture createGradient( int width, int height, int... colors ) {
+		
+		final String key = "" + width + "x" + height + ":" + colors;
+		
+		if (all.containsKey( key )) {
+			
+			return all.get( key );
+			
+		} else {
+		
+			Bitmap bmp = Bitmap.createBitmap( width, height, Bitmap.Config.ARGB_8888 );
+			Canvas canvas = new Canvas( bmp );
+			Paint paint = new Paint();
+			paint.setShader( new LinearGradient( 0, 0, 0, height, colors, null, TileMode.CLAMP ) );
+			canvas.drawPaint( paint );
+			
+			SmartTexture tx = new SmartTexture( bmp );
+			all.put( key, tx );
+			return tx;
+		}
+		
+	}
+	
+	public static void add( Object key, SmartTexture tx ) {
+		all.put( key, tx );
+	}
+
+	public static SmartTexture get( Object src ) {
+		
+		if (all.containsKey( src )) {
+			
+			return all.get( src );
+			
+		} else if (src instanceof SmartTexture) {
+			
+			return (SmartTexture)src;
+			
+		} else {
+
+			SmartTexture tx = new SmartTexture( getBitmap( src ) );
+			all.put( src, tx );
+			return tx;
+		}
+		
+	}
+	
+	public static void clear() {
+		
+		for (Texture txt:all.values()) {
+			txt.delete();
+		}
+		all.clear();
+		
+	}
+	
+	public static void reload() {
+		for (SmartTexture tx:all.values()) {
+			tx.reload();
+		}
+	}
+	
+	public static Bitmap getBitmap( Object src ) {
+		
+		try {
+			if (src instanceof Integer){
+				
+				return BitmapFactory.decodeResource(
+					context.getResources(), (Integer)src, bitmapOptions );
+				
+			} else if (src instanceof String) {
+				
+				return BitmapFactory.decodeStream(
+					context.getAssets().open( (String)src ), null, bitmapOptions );
+				
+			} else if (src instanceof Bitmap) {
+				
+				return (Bitmap)src;
+				
+			} else {
+				
+				return null;
+				
+			}
+		} catch (Exception e) {
+			
+			e.printStackTrace();
+			return null;
+			
+		}
+	}
+	
+	public static boolean contains( Object key ) {
+		return all.containsKey( key );
+	}
+	
+}