Use NV glsl shader compiler for Vulkan

Use NV glsl shader compiler for Vulkan

The nvidia direct glsl shader compiler seems to perform much better than using
shaderc to compile to spir-v first.

This change also includes a change to prefer host cached memory for buffers.
Having cached buffers signifcantly improves performance whenever we need to do
buffer reads and writes.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1835813003

Committed: https://skia.googlesource.com/skia/+/c5ec1408298510410270ea67e895570ccfa76e54

[egdaniel, 2016-03-28 17:42:35]

Description was changed from

==========
Use NV glsl shader compiler for Vulkan

The nvidia direct glsl shader compiler seems to perform much better than using
shaderc to compile to spir-v first.

This change also includes a change to prefer host cached memory for buffers.
Having cached buffers signifcantly improves performance whenever we need to do
buffer reads and writes.

BUG=skia:
==========

to

==========
Use NV glsl shader compiler for Vulkan

The nvidia direct glsl shader compiler seems to perform much better than using
shaderc to compile to spir-v first.

This change also includes a change to prefer host cached memory for buffers.
Having cached buffers signifcantly improves performance whenever we need to do
buffer reads and writes.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

[egdaniel, 2016-03-28 17:46:51]

egdaniel@google.com changed reviewers:
+ jvanverth@google.com

[jvanverth1, 2016-03-28 18:17:10]

lgtm

[egdaniel, 2016-03-28 18:57:45]

The CQ bit was checked by egdaniel@google.com

[commit-bot: I haz the power, 2016-03-28 18:57:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1835813003/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1835813003/40001

[commit-bot: I haz the power, 2016-03-28 19:14:46]

Description was changed from

==========
Use NV glsl shader compiler for Vulkan

The nvidia direct glsl shader compiler seems to perform much better than using
shaderc to compile to spir-v first.

This change also includes a change to prefer host cached memory for buffers.
Having cached buffers signifcantly improves performance whenever we need to do
buffer reads and writes.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
==========

to

==========
Use NV glsl shader compiler for Vulkan

The nvidia direct glsl shader compiler seems to perform much better than using
shaderc to compile to spir-v first.

This change also includes a change to prefer host cached memory for buffers.
Having cached buffers signifcantly improves performance whenever we need to do
buffer reads and writes.

BUG=skia:
GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...

Committed:
https://skia.googlesource.com/skia/+/c5ec1408298510410270ea67e895570ccfa76e54
==========

[commit-bot: I haz the power, 2016-03-28 19:14:47]

Committed patchset #3 (id:40001) as
https://skia.googlesource.com/skia/+/c5ec1408298510410270ea67e895570ccfa76e54