Distorted Android

Some fixes for issues discovered by the Multiblur app.

Beginnings of the 'Multiblur' app.

Beginnings of the 'Multiblur' app.

Separable Gaussian Blur with linear sampling done.

Linear sampling implemented - i.e. blurring by a (2N+1)x(2N+1) gaussian kernel (centeral pixel + N pixels in each direction) requires exactly 2N + (N%2==1 ? 4:2) texture fetches.

Separable Box blur (almost) works.

Correct a bug in Effects3D.

Try using OpenGL ES 3.0 everywhere (but if device does not support it, try creating 2.0 context - this is important because of the emulator!)

Manifest: require OpenGL ES 3.0.

Improvements for the 'Cubes' and 'Effects3D' apps.

Small bugfix