Wrap NV_path_rendering API with GrGLPathRendering

Wrap NV_path_rendering API with GrGLPathRendering

Adds a GrGLPathRendering class that wraps the NV_path_rendering
extension and manages its various API versions. It also provides
backup implementations when certain NVpr methods from later API
versions are not present on the current system.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/c7103a104fdc7150b4e3c0d3efc42735ad359616

[Chris Dalton, 2014-08-06 23:17:18]

The bug was in GrGpuGL_program.cpp. It was abandoning the path rendering
resources without checking if path rendering existed in the first place (i.e.
without checking for null pointer).

[Chris Dalton, 2014-08-07 22:03:00]

Adding Brian

[Kimmo Kinnunen, 2014-08-08 12:39:45]

./gyp_skia && ninja -C out/Debug/ dm &&  gdb --args ./out/Debug/dm --config
nvprmsaa4 -w p  --abandonGpuContext

....


Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffed400700 (LWP 6861)]
0x00000000009cb136 in
GrStencilAndCoverTextContext::GlyphPathRange::gpuMemorySize
(this=0x7fffa82064f0) at ../../src/gpu/GrStencilAndCoverTextContext.cpp:79
79	    virtual size_t gpuMemorySize() const SK_OVERRIDE { return
fPathRange->gpuMemorySize(); }
(gdb) bt
#0  0x00000000009cb136 in
GrStencilAndCoverTextContext::GlyphPathRange::gpuMemorySize
(this=0x7fffa82064f0) at ../../src/gpu/GrStencilAndCoverTextContext.cpp:79
#1  0x00000000009c6060 in GrResourceCacheEntry::validate (this=0x7fffa85f6b90)
at ../../src/gpu/GrResourceCache.cpp:62
#2  0x00000000009c725f in GrResourceCache::validate (this=0x7fffa8c69fe0) at
../../src/gpu/GrResourceCache.cpp:499
#3  0x00000000009c75b1 in
GrAutoResourceCacheValidate::GrAutoResourceCacheValidate (this=0x7fffed3ffd60,
cache=0x7fffa8c69fe0) at ../../src/gpu/GrResourceCache.h:388
#4  0x00000000009c6dd5 in GrResourceCache::purgeAllUnlocked
(this=0x7fffa8c69fe0) at ../../src/gpu/GrResourceCache.cpp:425
#5  0x000000000098a6c7 in GrContext::abandonContext (this=0x7fffa8c5f000) at
../../src/gpu/GrContext.cpp:199
#6  0x00000000004134a5 in GrContextFactory::abandonContexts
(this=0x7fffed3ffe30) at ../../include/gpu/GrContextFactory.h:114
#7  0x00000000004131a2 in DM::GpuTask::run (this=0x1021cd0, factory=...) at
../../dm/DMTask.cpp:72
#8  0x00000000004144bc in
SkThreadPoolPrivate::ThreadLocal<GrContextFactory>::run (this=0x7fffed3ffe30,
r=0x1021cf0) at ../../src/utils/SkThreadPool.h:110
#9  0x0000000000413ecc in SkTThreadPool<GrContextFactory>::Loop
(arg=0x7fffffffddc0) at ../../src/utils/SkThreadPool.h:207
#10 0x000000000095055e in thread_start (arg=0xff1930) at
../../src/utils/SkThreadUtils_pthread.cpp:66
#11 0x00007ffff736ae9a in start_thread (arg=0x7fffed400700) at
pthread_create.c:308
#12 0x00007ffff5cd973d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112

[Chris Dalton, 2014-08-11 18:57:55]

On 2014/08/08 12:39:45, kkinnunen wrote:
> ./gyp_skia && ninja -C out/Debug/ dm &&  gdb --args ./out/Debug/dm --config
> nvprmsaa4 -w p  --abandonGpuContext
> 
> ....

This crash was actually unrelated, but fixed here:
https://codereview.chromium.org/452273003/

[bsalomon, 2014-08-11 19:03:04]

lgtm

[Chris Dalton, 2014-08-11 19:37:03]

The CQ bit was checked by cdalton@nvidia.com

[commit-bot: I haz the power, 2014-08-11 19:37:58]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/cdalton@nvidia.com/444223002/1

[commit-bot: I haz the power, 2014-08-11 19:38:03]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-08-11 19:38:04]

Failed to apply patch for gyp/gpu.gypi:
While running git apply --index -p1;
  error: patch failed: gyp/gpu.gypi:202
  error: gyp/gpu.gypi: patch does not apply

Patch:       gyp/gpu.gypi
Index: gyp/gpu.gypi
diff --git a/gyp/gpu.gypi b/gyp/gpu.gypi
index
f2bd4e2f8207a6e77bce25b95d16a2fb0d07e225..4da75978b432e8d84250272cbdd20bac11aacc40
100644
--- a/gyp/gpu.gypi
+++ b/gyp/gpu.gypi
@@ -202,6 +202,8 @@
       '<(skia_src_path)/gpu/gl/GrGLPath.h',
       '<(skia_src_path)/gpu/gl/GrGLPathRange.cpp',
       '<(skia_src_path)/gpu/gl/GrGLPathRange.h',
+      '<(skia_src_path)/gpu/gl/GrGLPathRendering.cpp',
+      '<(skia_src_path)/gpu/gl/GrGLPathRendering.h',
       '<(skia_src_path)/gpu/gl/GrGLProgram.cpp',
       '<(skia_src_path)/gpu/gl/GrGLProgram.h',
       '<(skia_src_path)/gpu/gl/GrGLProgramDesc.cpp',

[Chris Dalton, 2014-08-11 20:56:06]

The CQ bit was checked by cdalton@nvidia.com

[commit-bot: I haz the power, 2014-08-11 20:56:31]

CQ is trying da patch. Follow status at
 https://skia-tree-status.appspot.com/cq/cdalton@nvidia.com/444223002/20001

[commit-bot: I haz the power, 2014-08-11 21:05:12]

Change committed as c7103a104fdc7150b4e3c0d3efc42735ad359616