v0.4.2: VBOs now work with android 2.2

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

@@ -24,6 +24,7 @@ package com.watabou.glwrap;
 import java.nio.FloatBuffer;
 
 import android.opengl.GLES20;
+import android.os.Build;
 
 public class Attribute {
 
@@ -50,6 +51,10 @@ public class Attribute {
 	}
 
 	public void vertexBuffer( int size, int stride, int offset) {
-		GLES20.glVertexAttribPointer( location, size, GLES20.GL_FLOAT, false, stride * Float.SIZE / 8, offset * Float.SIZE / 8 );
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
+			GLES20.glVertexAttribPointer(location, size, GLES20.GL_FLOAT, false, stride * Float.SIZE / 8, offset * Float.SIZE / 8);
+		} else {
+			FroyoGLES20Fix.glVertexAttribPointer(location, size, GLES20.GL_FLOAT, false, stride * Float.SIZE / 8, offset * Float.SIZE / 8);
+		}
 	}
 }

SPD-classes/src/main/java/com/watabou/glwrap/FroyoGLES20Fix.java

@@ -0,0 +1,50 @@
+/*
+ * 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.glwrap;
+
+//This class exists because the back-end OpenGL implementation (written in C)
+// supports VBO operations (along with the rest of GLES 2.0) since android 2.2 (Froyo, api 8),
+// but for some reason the Java calls for these methods were only added in 2.3 (Gingerbread, api 9)
+
+//So this class is here specifically to reference an armabi/x86 compiled binary
+// which gives us Java hooks for VBOs on android 2.2
+
+//...I don't know what google engineer forgot to put the java hooks in android 2.2 back in 2010,
+// but you know who you are and this class is your fault.
+
+//Note that compiled binares are included with this source,
+// so the android NDK is not needed to compile this project
+
+//DO NOT REFERENCE THIS CLASS ON DEVICES API 9 AND ABOVE, use android.opengl.GLES20 instead.
+@SuppressWarnings("JniMissingFunction")
+public class FroyoGLES20Fix {
+
+	static
+	{
+		System.loadLibrary("FroyoGLES20Fix");
+	}
+
+	native public static void glVertexAttribPointer(int index, int size, int type, boolean normalized, int stride, int offset);
+
+	native public static void glDrawElements(int mode, int count, int type, int offset);
+
+}