Commit Graph

120 Commits

Author SHA1 Message Date
Mike Klein
c0bd9f9fe5 rewrite includes to not need so much -Ifoo
Current strategy: everything from the top

Things to look at first are the manual changes:

   - added tools/rewrite_includes.py
   - removed -Idirectives from BUILD.gn
   - various compile.sh simplifications
   - tweak tools/embed_resources.py
   - update gn/find_headers.py to write paths from the top
   - update gn/gn_to_bp.py SkUserConfig.h layout
     so that #include "include/config/SkUserConfig.h" always
     gets the header we want.

No-Presubmit: true
Change-Id: I73a4b181654e0e38d229bc456c0d0854bae3363e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209706
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
2019-04-24 16:27:11 +00:00
Chris Dalton
4c56b03cfd Drop support for GL_EXT_raster_multisample
We had only used this extension in conjunction with
GL_NV_framebuffer_mixed_samples to draw directly to the framebuffer.
However, it's faster and higher quality to just use our own analytic
AA if we can draw directly to the framebuffer.

It might have been interesting to fake mixed samples using
GL_EXT_raster_multisample and PLS together, but those two extensions
don't appear to ever exist together.

Bug: skia:
Change-Id: Iea489cb0e03fc55aa64d3ea7fccc61b539cc461e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/197082
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
2019-03-05 11:35:21 +00:00
Brian Salomon
2cb3b9535b Remove GR_GL_USE_NEW_SHADER_SOURCE_SIGNATURE flag.
Enough's enough. It's been a long time since the standard was updated.

Change-Id: I49ae08ee49f06cb8403c9cb72a811edd35b25575
Reviewed-on: https://skia-review.googlesource.com/c/178930
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2018-12-19 14:15:01 +00:00
Brian Salomon
0a7e58f4c9 Add glTexParameterf[v] to GrGLInterface
Change-Id: Icd1f2a84f76cedfdb9dfd358e57e0fbc6cae49cb
Reviewed-on: https://skia-review.googlesource.com/c/175828
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
2018-12-10 14:50:23 +00:00
Brian Osman
f5bbf66eb4 Finish removing sample shading support
Chrome's initialization of the function pointer is gone:
https://chromium-review.googlesource.com/c/chromium/src/+/1366758

Bug: skia:
Change-Id: I025db12fbf8cfbcaee580b3494bd56e41b8fd325
Reviewed-on: https://skia-review.googlesource.com/c/175982
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2018-12-10 14:28:19 +00:00
Brian Salomon
a2a94a4c59 Add GrGLInterface support for sampler objects and GrGLCaps detection.
BUGL skia:8471

Change-Id: If67dbbcdca2d3130f6e10720c052c55a3b16482f
Reviewed-on: https://skia-review.googlesource.com/c/162561
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2018-10-16 20:30:58 +00:00
Brian Salomon
23952e2694 Remove legacy GrGLFunction specialization
Requires https://chromium-review.googlesource.com/c/chromium/src/+/1224660
to land.
Bug: skia:8262
Change-Id: I278360315d408e54e04d2e8e331e0be0b76a0d77
Reviewed-on: https://skia-review.googlesource.com/154501
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2018-09-28 13:43:37 +00:00
Brian Salomon
2424ec46e9 Make GrGLInterface great for Win32 x86 again
Bug: skia:8262
Change-Id: I607644198d5dc7992e2b89eb34651eb1dc88c6ba
Reviewed-on: https://skia-review.googlesource.com/149225
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2018-08-27 16:09:48 +00:00
Robert Phillips
752e08b1ae Fix abandonment of programs
Bug: skia:8092
TBR=bsalomon@google.com
Change-Id: If9cf4ed9f8ded4b7fbb58a244ec0b179b8430ca2
Reviewed-on: https://skia-review.googlesource.com/137121
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2018-06-25 12:09:55 +00:00
Ben Wagner
29f2eaf6e5 Remove string.h from SkTypes.h
Change-Id: I2be84f37ea11a386206a96d2fef6e0fc9464e21b
Reviewed-on: https://skia-review.googlesource.com/135264
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2018-06-15 20:32:05 +00:00
Brian Osman
3fc79ea031 Remove image functions from GrGLInterface, part two
First part is at:
https://skia-review.googlesource.com/c/skia/+/106120

Change-Id: I52c79a8635dcfb9eaf4c70f3a48b11349f9540d5
Reviewed-on: https://skia-review.googlesource.com/106268
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2018-02-12 20:45:43 +00:00
Brian Osman
426e6c5cba Remove (unused) NV_bindless_texture from GL interface
Change-Id: I232c200c30f348da4f61cd7d6d73f3f3b46e0770
Reviewed-on: https://skia-review.googlesource.com/105984
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2018-02-09 15:01:41 +00:00
Brian Osman
0ee0190173 Remove EXT_direct_state_access (unused)
Change-Id: I501fab7be512f5a0c4b26d666bbf883de4b73a59
Reviewed-on: https://skia-review.googlesource.com/105902
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2018-02-09 13:51:19 +00:00
Ethan Nicholas
d1b2eec0d0 API to cache shader binaries between runs of Skia.
This CL does not include an actual implementation of said cache.
Stan is working on the cache implementation on the Android side of
things.

Bug: skia:
Change-Id: Iabe4f19b2dbacaaa1ead8bb3fa68d88c687b9a84
Reviewed-on: https://skia-review.googlesource.com/54780
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
2017-11-02 13:07:41 +00:00
Mike Klein
7634330c98 reduce code size in GrGLTestInterface.o and GrGLAssembleInterface.o
All these std::function instantiations fill the object files up with
almost 1MB of boilerplate generated code.  I think we can do better by
implementing GrGLFunction as its own std::function-like type with much
less overhead, bringing the total object file size down to about 200K.

This reduces DM from 28780344 to 27726144 on my Mac, a touch above 1MB.

Change-Id: I219a86737d1dfb8b68e4eb47b51a8a98b18ff282
Reviewed-on: https://skia-review.googlesource.com/20551
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
2017-07-21 16:51:33 +00:00
Greg Daniel
dba7e7ccfb Add test for flushing empty surface with semaphores
Bug: skia:
Change-Id: I8d7dcb29c5b4c460aa5137842caf6563448ba5d3
Reviewed-on: https://skia-review.googlesource.com/25181
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2017-07-20 20:26:28 +00:00
Greg Daniel
81e7bf8d6d Update gpu caps for valid sample counts.
Instead of query and maxSampleCount and using that to cap, we now have
each config store its supported values and when requested returns either
the next highest or equal supported value, or if non the max config supported.

Bug: skia:
Change-Id: I8802d44c13b3b1703ee54a7e69b82102d4b8dc2d
Reviewed-on: https://skia-review.googlesource.com/24302
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2017-07-19 19:13:25 +00:00
Brian Salomon
d17b4a678b Revert "Revert "Add a flag to GrSurfaceFlags that requires the texture to be cleared upon creation. ""
This reverts commit a9e795eab5.

Bug: skia:
Change-Id: Ibfc51497ae99f332f8f72a799393a1b2996f7f3f
Reviewed-on: https://skia-review.googlesource.com/17767
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2017-05-23 21:38:38 +00:00
Brian Salomon
a9e795eab5 Revert "Add a flag to GrSurfaceFlags that requires the texture to be cleared upon creation. "
This reverts commit 45e5068a6d.

Reason for revert: :'(

Original change's description:
> Add a flag to GrSurfaceFlags that requires the texture to be cleared upon creation. 
> 
> Bug: chromium:656320
> 
> Change-Id: I940bfa24540516ab83a2ed52f761b96eb6ad19f1
> Reviewed-on: https://skia-review.googlesource.com/17391
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> 

TBR=egdaniel@google.com,bsalomon@google.com,robertphillips@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Bug: chromium:656320

Change-Id: I8a4f71537e45f3c4cf37b10b2dc8ee38fe6959ba
Reviewed-on: https://skia-review.googlesource.com/17765
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2017-05-23 19:03:01 +00:00
Brian Salomon
45e5068a6d Add a flag to GrSurfaceFlags that requires the texture to be cleared upon creation.
Bug: chromium:656320

Change-Id: I940bfa24540516ab83a2ed52f761b96eb6ad19f1
Reviewed-on: https://skia-review.googlesource.com/17391
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2017-05-23 18:07:25 +00:00
Jim Van Verth
609e7ccc66 Add glPolygonMode support.
Mainly added because it's useful for rendering in wireframe mode.

Change-Id: I84dab43ce5b56a48d47dd16d4c98fa7648bb1f0b
Reviewed-on: https://skia-review.googlesource.com/10530
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2017-03-30 19:08:47 +00:00
Greg Daniel
6be3523885 Add support for Semaphores (gpu waiting on gpu) in Ganesh
BUG=skia:

Change-Id: I4324b65bc50a3dfd90372459899870d5f1952fdc
Reviewed-on: https://skia-review.googlesource.com/9120
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2017-03-02 01:14:01 +00:00
Brian Salomon
0b63ceb10c Add image functions to GrGLInterface
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4840

Change-Id: I250cc4e637765c321c90e33c9b3f25c4ad12fe04
Reviewed-on: https://skia-review.googlesource.com/4840
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
2016-11-15 19:37:35 +00:00
jvanverth
84741b3084 Add fence support for TransferBuffers
BUG=skia:4604
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2384463003

Review-Url: https://codereview.chromium.org/2384463003
2016-09-30 08:39:03 -07:00
bsalomon
fc9527a0df Add support for glDrawRangeElements
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2287003002

Review-Url: https://codereview.chromium.org/2287003002
2016-08-29 09:18:39 -07:00
csmartdalton
9bc1187249 Include EXT_window_rectangles API
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2221393004

Review-Url: https://codereview.chromium.org/2221393004
2016-08-09 12:42:47 -07:00
csmartdalton
739bbb2dad Fix glDraw*Indirect prototypes
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2050403002

Review-Url: https://codereview.chromium.org/2050403002
2016-06-09 19:42:38 -07:00
cdalton
f8a6ce8d8c Add GLSL support for texelFetch
Adds a cap and builder methods for texelFetch. This is required for
texel buffers. Also moves the texel buffer cap into the general shader
caps, and adds glTexBufferRange to the GL interface.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1869063005

Review URL: https://codereview.chromium.org/1869063005
2016-04-11 13:02:05 -07:00
ethannicholas
28ef445d2e added support for glMinSampleShading
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1812223002

Review URL: https://codereview.chromium.org/1812223002
2016-03-25 09:26:03 -07:00
bsalomon
b5a94e3e24 Store null GL context's state in interface object
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1814113002

Review URL: https://codereview.chromium.org/1814113002
2016-03-18 12:07:24 -07:00
cdalton
c04ce676d4 Add caps and GL API for buffer texture
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1784063003

Review URL: https://codereview.chromium.org/1784063003
2016-03-11 14:07:38 -08:00
cdalton
eb79eea617 Include glGetMultisamplefv API
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1720963002

Committed: https://skia.googlesource.com/skia/+/69c1b24bcaa7cffd59753a75a7f3d155696fcac4

Review URL: https://codereview.chromium.org/1720963002
2016-02-26 10:39:34 -08:00
ethannicholas
f15b07b75c Revert of Include glGetMultisamplefv API (patchset #1 id:1 of https://codereview.chromium.org/1720963002/ )
Reason for revert:
This is in the blamelist for Visualbench failures:

https://build.chromium.org/p/client.skia/builders/Perf-Ubuntu-GCC-ShuttleA-GPU-GTX660-x86_64-Release-VisualBench/builds/1035

and seems the most likely candidate for the failure, so I am tentatively reverting.

Original issue's description:
> Include glGetMultisamplefv API
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1720963002
>
> Committed: https://skia.googlesource.com/skia/+/69c1b24bcaa7cffd59753a75a7f3d155696fcac4

TBR=bsalomon@google.com,joshualitt@google.com,cdalton@nvidia.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1731333002
2016-02-24 08:19:04 -08:00
cdalton
69c1b24bca Include glGetMultisamplefv API
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1720963002

Review URL: https://codereview.chromium.org/1720963002
2016-02-23 13:38:47 -08:00
bsalomon
eb00475d23 Use skstd::remove_pointer_t in GrGLFunction
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1684513003

Review URL: https://codereview.chromium.org/1684513003
2016-02-09 08:28:54 -08:00
cdalton
793dc26ca6 Improve GLSL integer support
- Adds shader types for uint.
 - Adds a cap for integer support.
 - Uses glVertexAttribIPointer for integer attribs.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1669853002

Committed: https://skia.googlesource.com/skia/+/3a2caf8ecf38124f4ad21a0f6c4dabfcfa17911a

Review URL: https://codereview.chromium.org/1669853002
2016-02-08 10:11:47 -08:00
bsalomon
9f2dc27642 Replace GrGLInterface's function pointers with std::functions.
This is to facilitate binding to GLES2Interface in Chromium rather than the C interface. It requires capturing the GLES2Interface.
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1674823002

Review URL: https://codereview.chromium.org/1674823002
2016-02-08 07:22:17 -08:00
dcheng
c4d196c9c8 Revert of Improve GLSL integer support (patchset #1 id:1 of https://codereview.chromium.org/1669853002/ )
Reason for revert:
MSAN bots are unhappy with this change: https://build.chromium.org/p/chromium.memory.fyi/builders/Linux%20ChromeOS%20MSan%20Tests/builds/7068

Original issue's description:
> Improve GLSL integer support
>
>  - Adds shader types for uint.
>  - Adds a cap for integer support.
>  - Uses glVertexAttribIPointer for integer attribs.
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1669853002
>
> Committed: https://skia.googlesource.com/skia/+/3a2caf8ecf38124f4ad21a0f6c4dabfcfa17911a

TBR=bsalomon@google.com,egdaniel@google.com,ethannicholas@google.com,cdalton@nvidia.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1674813004
2016-02-06 15:08:55 -08:00
cdalton
3a2caf8ecf Improve GLSL integer support
- Adds shader types for uint.
 - Adds a cap for integer support.
 - Uses glVertexAttribIPointer for integer attribs.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1669853002

Review URL: https://codereview.chromium.org/1669853002
2016-02-05 16:26:32 -08:00
cdalton
06604b9562 Add GL indirect drawing APIs
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1666803002

Review URL: https://codereview.chromium.org/1666803002
2016-02-05 10:09:51 -08:00
bsalomon
7ea33f5e1a Initial version of external_oes texture support and unit test
Committed: https://skia.googlesource.com/skia/+/27a048700778d4cebfc23301d1780649791b0e03

Review URL: https://codereview.chromium.org/1451683002
2015-11-22 14:51:00 -08:00
bsalomon
0315dbcb55 Revert of Initial version of external_oes texture support and unit test (patchset #14 id:260001 of https://codereview.chromium.org/1451683002/ )
Reason for revert:
Error wrapping external texture in GrTexture on some devices.

Original issue's description:
> Initial version of external_oes texture support and unit test
>
> Committed: https://skia.googlesource.com/skia/+/27a048700778d4cebfc23301d1780649791b0e03

TBR=joshualitt@google.com,egdaniel@google.com,robertphillips@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1459323004
2015-11-20 20:24:31 -08:00
bsalomon
27a0487007 Initial version of external_oes texture support and unit test
Review URL: https://codereview.chromium.org/1451683002
2015-11-20 19:34:37 -08:00
bsalomon
b1a32ad517 Add support for EGLImage to GrGLInterface
BUG=skia:

Review URL: https://codereview.chromium.org/1434813002
2015-11-16 06:48:44 -08:00
cdalton
7e806f3f8a Revert of Enable stencil clipping in mixed sampled render targets (patchset #6 id:100001 of https://codereview.chromium.org/1232103002/ )
Reason for revert:
Co-centered sample locations are not needed to do stencil clip with mixed samples

Original issue's description:
> Implement stencil clipping in mixed sampled render targets
>
> This change enables multisampled clipping for mixed sampled
> render targets.  Previously clipping in mixed samples config
> behaved the same as in the gpu config.
>
> In order to retrofit non-MSAA draw methods, programmable sample
> locations are used in order to colocate all samples at (0.5, 0.5).
> Requires support for NV_sample_locations.
>
> BUG=skia:4399
>
> Committed:
> https://skia.googlesource.com/skia/+/3e77ba96d56d15db30ac6d8ccb900e30aafcbb16

BUG=skia:

Review URL: https://codereview.chromium.org/1415873011
2015-11-11 15:16:07 -08:00
cdalton
24ddb0a4dd Revert of Fix setColocatedSampleLocations on ES and GL < 4.5 (patchset #2 id:20001 of https://codereview.chromium.org/1415503008/ )
Reason for revert:
Co-centered sample locations are not needed to do stencil clip with mixed samples.

Original issue's description:
> Fix setColocatedSampleLocations on ES and GL < 4.5
>
> Updates setColocatedSampleLocations to use glFramebufferParameteri
> when
> the DSA version glNamedFramebufferParameteri is not present.
>
> BUG=skia:
>
> Committed:
> https://skia.googlesource.com/skia/+/98cad6219b430eddf5528473311279f21dbd2e10

BUG=skia:

Review URL: https://codereview.chromium.org/1420883007
2015-11-11 15:03:46 -08:00
cdalton
98cad6219b Fix setColocatedSampleLocations on ES and GL < 4.5
Updates setColocatedSampleLocations to use glFramebufferParameteri when
the DSA version glNamedFramebufferParameteri is not present.

BUG=skia:

Review URL: https://codereview.chromium.org/1415503008
2015-11-03 09:33:21 -08:00
bsalomon
2fc11d39d1 Move definitions of GrGL basic types (e.g. GrGLenum) to their own header.
Review URL: https://codereview.chromium.org/1410333003
2015-10-19 09:03:23 -07:00
kkinnunen
0adfffba1b Fix dm with Chromium command buffer driver
Fix a crash in dm when run with Chromium command buffer driver.

Also removes glCopyTextureCHROMIUM, it does not seem to be used.
This is removed on the grounds that it would need similar change,
if it was used. The variable fCopyTextureCHROMIUM does not seem to
be populated in the Chromium side, either.

BUG=skia:2992

Review URL: https://codereview.chromium.org/1389213004
2015-10-13 12:58:38 -07:00
vbuzinov
3e77ba96d5 Implement stencil clipping in mixed sampled render targets
This change enables multisampled clipping for mixed sampled
render targets.  Previously clipping in mixed samples config
behaved the same as in the gpu config.

In order to retrofit non-MSAA draw methods, programmable sample
locations are used in order to colocate all samples at (0.5, 0.5).
Requires support for NV_sample_locations.

BUG=skia:4399

Review URL: https://codereview.chromium.org/1232103002
2015-09-30 23:02:06 -07:00