Actually, the permTexture is 256*256 pixels

Change-Id: Ia32c98d8162f31a8ee0b0d0c1301ca204c9c3c87

slideshow/opengl/dissolveFragmentShader.glsl

@@ -38,9 +38,7 @@ float snoise(vec2 P) {
 }
 
 void main() {
-     // No idea why the multiplication by 10 (and not 16, which would seem more logical to me, as
-     // the permTexture is 16*16 pixels in size).
-     float sn = snoise(10.0*v_texturePosition);
+     float sn = snoise(256*v_texturePosition);
      if( sn < time)
          gl_FragColor = texture2D(enteringSlideTexture, v_texturePosition);
      else