commit 0ce6fcefcb7a9e214f6c51ca9cb989e6fd57e32b
Author: Leszek Koltunski <leszek@distorted.org>
Date:   Tue Jul 26 20:01:33 2016 +0100

    Cull back faces of triangles.

diff --git a/src/main/java/org/distorted/library/Distorted.java b/src/main/java/org/distorted/library/Distorted.java
index ef9f5c1..4a47a94 100644
--- a/src/main/java/org/distorted/library/Distorted.java
+++ b/src/main/java/org/distorted/library/Distorted.java
@@ -347,6 +347,8 @@ public class Distorted
     GLES20.glDepthFunc(GLES20.GL_LEQUAL);
     GLES20.glEnable(GLES20.GL_BLEND);
     GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);
+    GLES20.glEnable(GLES20.GL_CULL_FACE);
+    GLES20.glCullFace(GLES20.GL_BACK);
 
     mTextureUniformH = GLES20.glGetUniformLocation(mProgramH, "u_Texture");