This is a speculative fix for the crashing N5 bots. It looks like the bots are
always failing in or around FloatingPointTextureTest.
It looks like sometimes they're hitting a SIGBUS, which I suspect is stack
overflow. FloatingPointTextureTest allocates ~320K on the stack, which may
be too much. This CL moves those buffers to the heap. For consistency I did
the same with the half-float tests, though they're only using ~1/8th the stack.
It looks like sometimes the bots are failing to malloc. I don't understand that,
and this CL doesn't address that directly. But it's possible this is still a stack
overflow, just trashing RAM and causing arbitrary mayhem instead of a SIGBUS.
I have no idea why this is a problem only on the N5. I have been unable to
reproduce this locally, neither with a K N5 nor an L N5, but the bots are pretty
reliable.
NOTREECHECKS=true
BUG=skia:
Review URL: https://codereview.chromium.org/871623002
Added in check for sized internal format.
Made choice between RED and ALPHA orthogonal to HALF_FLOAT and
HALF_FLOAT_OES.
Enabled rendertarget support on ES 2.0.
Review URL: https://codereview.chromium.org/805033002
It's unclear what params should be used for half float alpha
rendertargets, so they are disabled for the moment.
Review URL: https://codereview.chromium.org/799593002
This allows us to create distance field textures with better precision,
which may help text quality.
BUG=skia:3103
Review URL: https://codereview.chromium.org/762923003
Consolidate read/write funcs in context.
Remove support for reading pixels from a surface that's not a target. It's currently broken and neither used nor tested.
Review URL: https://codereview.chromium.org/648863002
