Distorted Android

Revert "Beginnings of support for DistortedEffects.drawPrivFeedback()"

This reverts commit a22c66287b616833b0ad72d81d40cc321e4bc920.

Revert "Some progress with Transform Feedback. Still many bugs all over."

This reverts commit 79921db22e4ff5a3b2e6e3466a39445f5607a695.

Some progress with Transform Feedback. Still many bugs all over.

Beginnings of support for DistortedEffects.drawPrivFeedback()

This commit (and reading the OpenGL ES 3.0 spec) pretty conclusively proves that, sadly, Nexus 4's Transform Feedback implementation is incomplete (doesn't work with GL_TRIANGLES primitiveMode)

Progress with TransferFeedback app - introduce two modes: USEPOINTS 'true' or 'false'.

On Nexus5X, it works with 'true' and 'false'. On Nexus 4, it works with 'true', but returns GL_INVALID_OPERATION with 'false'.

This version appears to be fully working on Nexus 5X (it transfers back all the vertices and, if there are no vertex effects, the vertices transferred back are identical to the ones passed).

This however crashes with GL_INVALID_OPERATION during glDrawArrays() when run on Nexus 4.

Progress with Transform Feedback.

Progress with VBOs - this time abstract out a new class, DistortedObject - i.e. everything that uploads something to GPU and thus needs to be auto re-created upon loss of the context.

Preparation for Transfer Feedback: Convert the meshes from client-side to VBOs.