v0.6.3: refactored all opengl code out of the core module (except fog)

SPD-classes/src/main/java/com/watabou/glwrap/Blending.java

@@ -0,0 +1,53 @@
+/*
+ * Pixel Dungeon
+ * Copyright (C) 2012-2015  Oleg Dolya
+ *
+ * Shattered Pixel Dungeon
+ * Copyright (C) 2014-2017 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.glwrap;
+
+import android.opengl.GLES20;
+
+import javax.microedition.khronos.opengles.GL10;
+
+public class Blending {
+	
+	public static void useDefault(){
+		enable();
+		setNormalMode();
+	}
+	
+	public static void enable(){
+		GLES20.glEnable( GL10.GL_BLEND );
+	}
+	
+	public static void disable(){
+		GLES20.glDisable( GL10.GL_BLEND );
+	}
+	
+	//in this mode colors overwrite eachother, based on alpha value
+	public static void setNormalMode(){
+		GLES20.glBlendFunc( GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA );
+	}
+	
+	//in this mode colors add to eachother, eventually reaching pure white
+	public static void setLightMode(){
+		GLES20.glBlendFunc( GL10.GL_SRC_ALPHA, GL10.GL_ONE );
+	}
+	
+}