commit 53873b847790de39109ad79ece8bf51a3c455c21
Author: Leszek Koltunski <leszek@koltunski.pl>
Date:   Fri Aug 21 11:38:38 2020 +0100

    Bugfix.

diff --git a/src/main/res/raw/main_vertex_shader.glsl b/src/main/res/raw/main_vertex_shader.glsl
index 816763c..61a1d08 100644
--- a/src/main/res/raw/main_vertex_shader.glsl
+++ b/src/main/res/raw/main_vertex_shader.glsl
@@ -141,6 +141,10 @@ void main()
     v_Position    = vec3(tmp1);
     v_endPosition = vec3(tmp1+100.0*tmp2);
     }
+  else
+    {
+    v_Position = v;
+    }
 #endif
 
   v_TexCoordinate = a_TexCoordinate;