Disable FP frame buffer when GL_ARG_texture_float is not present.

Change-Id: I975243b3238ded1d21656646788eb7117e5348b8
Return early if ProjectedTetrahedra volume rendering is unsupported.

Change-Id: Ib08bed8cc680a5f5ef50aafb44f1b84c079bb5e4
Add new baseline for rendering without floating point buffers.

Change-Id: I7b7f04b8503ea9cec42c8d4264f6550f34c2f8ff
Merge topic '14615-disable-FPFB' into master

f61c11bc Add new baseline for rendering without floating point buffers.
f521f415 Return early if ProjectedTetrahedra volume rendering is unsupported.
16368b4d Disable FP frame buffer when GL_ARG_texture_float is not present.