tree d5216a2fa307a657f2601057f49459b260449cee
parent cba224e83385c5141c9dfbf9f8cfee2d7fc83f31
author Arun <arun.demeure@imgtec.com> 1485171666 +0000
committer John Reck <jreck@google.com> 1493997087 +0000

Reduce hwui CPU time by using glDrawRangeElements

The CPU overhead of glDrawElements in the GPU driver is significant
with client-side vertex data (unique per draw call) as the driver has
to calculate the mininimum and maximum indices from the index buffer
in order to evaluate the range of vertex data required. This can be
avoided by keeping track of the min-max in hwui and passing it with
glDrawRangeElements. This requires OpenGL ES3.0 support (which is
already checked for elsewhere in hwui).

Test: manual - visual inspection on fugu (nexus player)

Change-Id: I57bb1ddd239a1032f74f1cd2683bbe0970e84bd9