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path: root/src/gpu/gl/GrGLPathRendering.cpp
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* Revert of Enable stencil clipping in mixed sampled render targets (patchset ↵Gravatar cdalton2015-11-11
| | | | | | | | | | | | | | | | | | | | | | | | | | | #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
* Revert of Fix mixed samples stencil clip (patchset #5 id:80001 of ↵Gravatar cdalton2015-11-10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | https://codereview.chromium.org/1431593006/ ) Reason for revert: Co-centered sample locations are not needed to do stencil clip with mixed samples. Original issue's description: > Fix mixed samples stencil clip > > Fixes rendering bugs and nondeterminism in gm. > > Before, mixed samples stencil clip would try to infer whether the draw > wanted co-centered sample locations from within GrGLGpu, which caused > various errors. This change reworks it so the draw itself can request > the co-centered sample locations when it knows it will need them. > > Also reduces framebuffer binds by moving the code that enables > GL_FRAMEBUFFER_PROGRAMMABLE_SAMPLE_LOCATIONS into flushRenderTarget. > > Committed: https://skia.googlesource.com/skia/+/14184d5567b58085b6d8a6375796d405056f7f73 TBR=bsalomon@google.com NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true Review URL: https://codereview.chromium.org/1407063011
* Fix mixed samples stencil clipGravatar cdalton2015-11-09
| | | | | | | | | | | | | | Fixes rendering bugs and nondeterminism in gm. Before, mixed samples stencil clip would try to infer whether the draw wanted co-centered sample locations from within GrGLGpu, which caused various errors. This change reworks it so the draw itself can request the co-centered sample locations when it knows it will need them. Also reduces framebuffer binds by moving the code that enables GL_FRAMEBUFFER_PROGRAMMABLE_SAMPLE_LOCATIONS into flushRenderTarget. Review URL: https://codereview.chromium.org/1431593006
* Create GLSL base class for ProgramDataManagerGravatar egdaniel2015-10-28
| | | | | | BUG=skia: Review URL: https://codereview.chromium.org/1428543003
* Implement stencil clipping in mixed sampled render targetsGravatar vbuzinov2015-09-30
| | | | | | | | | | | | | | 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
* Style Change: NULL->nullptrGravatar halcanary2015-08-27
| | | | | | DOCS_PREVIEW= https://skia.org/?cl=1316233002 Review URL: https://codereview.chromium.org/1316233002
* Style Change: SkNEW->new; SkDELETE->deleteGravatar halcanary2015-08-26
| | | | | | DOCS_PREVIEW= https://skia.org/?cl=1316123003 Review URL: https://codereview.chromium.org/1316123003
* Implement support for CHROMIUM_path_rendering pseudo extensionGravatar kkinnunen2015-07-14
| | | | | | | | | | | | | | | | Implement support for path rendering in Chromium through CHROMIUM_path_rendering pseudo extension. The extension defines a new pseudo-gl function, BindFragmentInputLocation. This behaves similarly to the BindUniformLocation pseudo-gl function. The idea is to assign fragment input location to a fragment input before linking the program. BUG=chromium:344330 Committed: https://skia.googlesource.com/skia/+/eeef46d181f9f8db388ecea81df699fc1b3c9280 Review URL: https://codereview.chromium.org/1192663002
* Revert of Implement support for CHROMIUM_path_rendering pseudo extension ↵Gravatar jvanverth2015-07-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (patchset #4 id:60001 of https://codereview.chromium.org/1192663002/) Reason for revert: DEPS roll failing Original issue's description: > Implement support for CHROMIUM_path_rendering pseudo extension > > Implement support for path rendering in Chromium through > CHROMIUM_path_rendering pseudo extension. > > The extension defines a new pseudo-gl function, > BindFragmentInputLocation. This behaves similarly to the > BindUniformLocation pseudo-gl function. The idea is to assign fragment > input location to a fragment input before linking the program. > > BUG=chromium:344330 > > Committed: https://skia.googlesource.com/skia/+/eeef46d181f9f8db388ecea81df699fc1b3c9280 TBR=bsalomon@google.com,joshualitt@google.com,kkinnunen@nvidia.com NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=chromium:344330 Review URL: https://codereview.chromium.org/1223673002
* Implement support for CHROMIUM_path_rendering pseudo extensionGravatar kkinnunen2015-07-02
| | | | | | | | | | | | | | Implement support for path rendering in Chromium through CHROMIUM_path_rendering pseudo extension. The extension defines a new pseudo-gl function, BindFragmentInputLocation. This behaves similarly to the BindUniformLocation pseudo-gl function. The idea is to assign fragment input location to a fragment input before linking the program. BUG=chromium:344330 Review URL: https://codereview.chromium.org/1192663002
* Cleanup legacy NVPR-related definitionsGravatar kkinnunen2015-07-01
| | | | | | | | | | | | | | | | | | | | | | | | Fixed-function NVPR codepaths were removed a while ago. Only NVPR API version 1.3 (PathFragmentInputGen) was left working. Remove backwards-compatibility code that was left behind. Remove some NVPR API function typedefs that were left from initial commits. Remove PathCoords function pointer from GrGLInterface, it has never been called and causes problems in the future, since it will not be implemented in the Chromium pseudo extension. Avoid failing interface creation even if nvprmsaaXX config is requested but the driver is not recent enough. The SAN bots have old driver, but try to run nvprmsaa16 configs. Instead, print out a warning. Committed: https://skia.googlesource.com/skia/+/fb8d6884e0e01d0c2f8596adf5af1efb0d08de7e Committed: https://skia.googlesource.com/skia/+/e35b5d99d8dfcc6b2be844df28cba47436380809 Review URL: https://codereview.chromium.org/1177243004
* Revert of Cleanup legacy NVPR-related definitions (patchset #4 id:60001 of ↵Gravatar jvanverth2015-06-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | https://codereview.chromium.org/1177243004/) Reason for revert: Breaks the Ubuntu *SAN bots. Original issue's description: > Cleanup legacy NVPR-related definitions > > Fixed-function NVPR codepaths were removed a while ago. Only NVPR API > version 1.3 (PathFragmentInputGen) was left working. Remove > backwards-compatibility code that was left behind. > > Remove some NVPR API function typedefs that were left from initial > commits. > > Remove PathCoords function pointer from GrGLInterface, it has > never been called and causes problems in the future, since it will > not be implemented in the Chromium pseudo extension. > > Committed: https://skia.googlesource.com/skia/+/fb8d6884e0e01d0c2f8596adf5af1efb0d08de7e > > Committed: https://skia.googlesource.com/skia/+/e35b5d99d8dfcc6b2be844df28cba47436380809 TBR=joshualitt@google.com,cdalton@nvidia.com,bsalomon@google.com,kkinnunen@nvidia.com NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true Review URL: https://codereview.chromium.org/1219663005
* Cleanup legacy NVPR-related definitionsGravatar kkinnunen2015-06-30
| | | | | | | | | | | | | | | | | Fixed-function NVPR codepaths were removed a while ago. Only NVPR API version 1.3 (PathFragmentInputGen) was left working. Remove backwards-compatibility code that was left behind. Remove some NVPR API function typedefs that were left from initial commits. Remove PathCoords function pointer from GrGLInterface, it has never been called and causes problems in the future, since it will not be implemented in the Chromium pseudo extension. Committed: https://skia.googlesource.com/skia/+/fb8d6884e0e01d0c2f8596adf5af1efb0d08de7e Review URL: https://codereview.chromium.org/1177243004
* Revert of Cleanup legacy NVPR-related definitions (patchset #3 id:40001 of ↵Gravatar fmalita2015-06-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | https://codereview.chromium.org/1177243004/) Reason for revert: Broke the GPU SAN bots: https://build.chromium.org/p/client.skia/builders/Test-Ubuntu-GCC-Golo-GPU-GT610-x86_64-Debug-ASAN/builds/779/steps/dm/logs/stdio Original issue's description: > Cleanup legacy NVPR-related definitions > > Fixed-function NVPR codepaths were removed a while ago. Only NVPR API > version 1.3 (PathFragmentInputGen) was left working. Remove > backwards-compatibility code that was left behind. > > Remove some NVPR API function typedefs that were left from initial > commits. > > Remove PathCoords function pointer from GrGLInterface, it has > never been called and causes problems in the future, since it will > not be implemented in the Chromium pseudo extension. > > Committed: https://skia.googlesource.com/skia/+/fb8d6884e0e01d0c2f8596adf5af1efb0d08de7e TBR=joshualitt@google.com,cdalton@nvidia.com,bsalomon@google.com,kkinnunen@nvidia.com NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true Review URL: https://codereview.chromium.org/1206333003
* Cleanup legacy NVPR-related definitionsGravatar kkinnunen2015-06-25
| | | | | | | | | | | | | | | Fixed-function NVPR codepaths were removed a while ago. Only NVPR API version 1.3 (PathFragmentInputGen) was left working. Remove backwards-compatibility code that was left behind. Remove some NVPR API function typedefs that were left from initial commits. Remove PathCoords function pointer from GrGLInterface, it has never been called and causes problems in the future, since it will not be implemented in the Chromium pseudo extension. Review URL: https://codereview.chromium.org/1177243004
* Stop using the NVPR glyph loading functionalityGravatar kkinnunen2015-06-23
| | | | | | Remove the NVPR glyph loading functionality. A bit risky feature. Review URL: https://codereview.chromium.org/1176113008
* don't rely on fonts having a streamGravatar caryclark2015-06-15
| | | | | | | | | | Portable fonts don't have streams, so expect the stream open to fail. R=bungeman@google.com TBR=cdalton@nvidia.com Review URL: https://codereview.chromium.org/1185803003
* Refactor GrGpu path rendering functions to GrPathRenderingGravatar kkinnunen2015-06-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | GrGpu, GrGLGpu, GrPathRendering, GrGLPathRendering all duplicated each others' path rendering related member functions. Make GrPathRending the logical extension of GrGpu by removing the methods from GrGpu. Similarly to the GL variants. Changes includes and forward declarations due to removing GrDrawTarget.h include from GrGpu.h. This was necessary due to GrDrawTarget.h including GrPathRendering.h, and now GrPathRendering.h includes GrGpu.h. (Also GrGpu.h does not need GrDrawTarget.h anymore). Very slight runtime improvement on x86_64: desk_fontwipe.skp_1 836us -> 841us 1.01x desk_silkfinance.skp_1 2.01ms -> 2.01ms 1x desk_forecastio.skp_1 7.03ms -> 7.05ms 1x desk_weather.skp_1 3.74ms -> 3.74ms 1x desk_twitter.skp_1 8.02ms -> 8.01ms 1x desk_mapsvg.skp_1 5.24ms -> 5.23ms 1x desk_pokemonwiki.skp_1 7.06ms -> 7.03ms 1x desk_sfgate.skp_1 3.19ms -> 3.17ms 1x tabl_cuteoverload.skp_1 2.66ms -> 2.64ms 0.99x ... tabl_transformice.skp_1 3.06ms -> 2.98ms 0.98x tabl_googlecalendar.skp_1 11.3ms -> 11ms 0.97x tabl_gamedeksiam.skp_1 12.8ms -> 12.4ms 0.97x desk_samoasvg.skp_1 10.6ms -> 10.3ms 0.97x tabl_worldjournal.skp_1 4.44ms -> 4.3ms 0.97x Review URL: https://codereview.chromium.org/1157683006
* Avoid creating GrGLPath to the resource cache when creating GrGLPathRangesGravatar kkinnunen2015-05-24
| | | | | | | | | | | Do not create a GrGLPath when loading glyphs with the driver and creating GrGLPathRange based on those. The path would be inserted to the GPU resource cache and then immediately be released. Instead, just init the first path object of the path range as the template. Review URL: https://codereview.chromium.org/1146983004
* Improve caching of dashed paths in GrStencilAndCoverPathRendererGravatar kkinnunen2015-05-18
| | | | | | | | | | | | | | | | Improve caching of dashed paths in GrStencilAndCoverPathRenderer. Look up the (NVPR specific) GrGLPath based on GrStrokeInfo and the original path. Use unique keys for all GrPaths. Dash the path with Skia dash stroker and use that path geometry for NVPR path. NVPR internal dashing stroke is not used, because the dashing implementation of NVPR does not match Skia implementation. Review URL: https://codereview.chromium.org/1116123003
* Pull out shader-specific caps into GrShaderCaps and GrGLSLCapsGravatar jvanverth2015-04-29
| | | | | | BUG=skia: Review URL: https://codereview.chromium.org/1116713002
* Remove legacy NVPR supportGravatar jvanverth2015-04-27
| | | | | | BUG=skia: Review URL: https://codereview.chromium.org/1110553003
* Make SkStream *not* ref counted.Gravatar scroggo2015-01-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | SkStream is a stateful object, so it does not make sense for it to have multiple owners. Make SkStream inherit directly from SkNoncopyable. Update methods which previously called SkStream::ref() (e.g. SkImageDecoder::buildTileIndex() and SkFrontBufferedStream::Create(), which required the existing owners to call SkStream::unref()) to take ownership of their SkStream parameters and delete when done (including on failure). Switch all SkAutoTUnref<SkStream>s to SkAutoTDelete<SkStream>s. In some cases this means heap allocating streams that were previously stack allocated. Respect ownership rules of SkTypeface::CreateFromStream() and SkImageDecoder::buildTileIndex(). Update the comments for exceptional methods which do not affect the ownership of their SkStream parameters (e.g. SkPicture::CreateFromStream() and SkTypeface::Deserialize()) to be explicit about ownership. Remove test_stream_life, which tested that buildTileIndex() behaved correctly when SkStream was a ref counted object. The test does not make sense now that it is not. In SkPDFStream, remove the SkMemoryStream member. Instead of using it, create a new SkMemoryStream to pass to fDataStream (which is now an SkAutoTDelete). Make other pdf rasterizers behave like SkPDFDocumentToBitmap. SkPDFDocumentToBitmap delete the SkStream, so do the same in the following pdf rasterizers: SkPopplerRasterizePDF SkNativeRasterizePDF SkNoRasterizePDF Requires a change to Android, which currently treats SkStreams as ref counted objects. Review URL: https://codereview.chromium.org/849103004
* possible bug fix for nvprGravatar joshualitt2015-01-14
| | | | | | | TBR=bsalomon@google.com BUG=skia: Review URL: https://codereview.chromium.org/850953003
* fix for winvdows nvprGravatar joshualitt2015-01-13
| | | | | | | TBR=bsalomon@google.com BUG=skia: Review URL: https://codereview.chromium.org/804023005
* ViewMatrix uniform upload moved to GeometryProcessorGravatar joshualitt2014-12-30
| | | | | | BUG=skia: Review URL: https://codereview.chromium.org/827973002
* Rename GrGpuGL -> GrGLGpuGravatar jvanverth2014-12-22
| | | | Review URL: https://codereview.chromium.org/824753002
* Rename GrGpuGL to GrGLGpu for consistencyGravatar bsalomon2014-12-16
| | | | Review URL: https://codereview.chromium.org/808593003
* More win64 warning fixesGravatar bsalomon2014-12-12
| | | | Review URL: https://codereview.chromium.org/798723002
* Fix some win64 warnings.Gravatar bsalomon2014-12-11
| | | | Review URL: https://codereview.chromium.org/795223002
* Add IndexType parameter to GrDrawTarget::drawPathsGravatar cdalton2014-11-25
| | | | | | | | | Allows the caller to decide whether they sent 8, 16, or 32 bit path indices. BUG=skia: Review URL: https://codereview.chromium.org/746253003
* Snap optdrawstate in inorder draw buffer and pass into gpuGravatar joshualitt2014-11-10
| | | | | | BUG=skia: Review URL: https://codereview.chromium.org/709133003
* Beginning to refactor nvpr codeGravatar joshualitt2014-10-31
| | | | | | BUG=skia: Review URL: https://codereview.chromium.org/687563008
* Fix stack-allocated GPU path objectGravatar cdalton2014-09-19
| | | | | | | | | | | | Fixes nvpr text to dynamically allocate its template path object, as per the Skia policy. BUG=skia: R=robertphillips@google.com, bsalomon@google.com Author: cdalton@nvidia.com Review URL: https://codereview.chromium.org/582033003
* Uses a single pre-baked set of paths for drawing nvpr text of a givenGravatar cdalton2014-09-18
| | | | | | | | | | | | | | | | | | | | | | | | | typeface. Loads the paths using the driver's glyph loading routines. Refactors GrPathRange to accept a PathGenerator class that it uses to lazily initialize its paths. The client code is no longer expected to initialize the paths in a GrPathRange; instead it must provide a PathGenerator* instance to createPathRange(). Adds a new createGlyphs() method to GrPathRendering that creates a range of glyph paths, indexed by glyph id. GrPathRendering implements createGlyphs() with a PathGenerator that loads glyph paths using the skia frameworks. GrGLPathRendering uses glMemoryGlyphIndexArrayNV() instead, when possible, to load the glyph paths. Removes all GlyphPathRange logic from GrStencilAndCoverTextContext. It instead uses createGlyphs(). BUG=skia:2939 R=bsalomon@google.com, jvanverth@google.com Author: cdalton@nvidia.com Review URL: https://codereview.chromium.org/563283004
* Adds glMemoryGlyphIndexArrayNV to the GrGLInterface and beginsGravatar cdalton2014-09-17
| | | | | | | | | | | detecting support for this method in GrGLPathRendering. BUG=skia:2939 R=bsalomon@google.com Author: cdalton@nvidia.com Review URL: https://codereview.chromium.org/570733002
* "NULL !=" = NULLGravatar bsalomon2014-09-05
| | | | | | | | R=reed@google.com Author: bsalomon@google.com Review URL: https://codereview.chromium.org/544233002
* Implement NV_path_rendering on OpenGL ESGravatar kkinnunen2014-08-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Implement support for NV_path_rendering on OpenGL ES. Use glProgramPathFragmentInputGenNV function call instead of glPathTexGenNV to communicate transforms to fragment shader. The intention is that the NVPR paths will be drawn with the same shader program as non-NVPR geometry. For NVPR calls, the GPU will skip the vertex shader and just run the fragment shader. After program is linked, query the locations of the fragment shader inputs with glGetResourceLocation. The location will be used to set the transforms with glProgramPathFragmentInputGenNV. The functions and their workings are documented in: glProgramPathFragmentInputGenNV https://www.opengl.org/registry/specs/NV/path_rendering.txt (note: addition as of API version 1.3) glGetResourceLocation https://www.opengl.org/registry/specs/ARB/program_interface_query.txt http://www.opengl.org/registry/doc/glspec44.core.pdf (function is in core Open GL 4.4) Note: glProgramPathFragmentInputGenNV could be used also for OpenGL. However, using seems to trigger a bug in the driver. Disable this feature on OpenGL at least until the driver is fixed and released. The bug manifests in shadertext test, where the lower-left text pair is missing. Valgrind catches a bad read for the test and causes the context to OOM reproducibly. R=bsalomon@google.com, cdalton@nvidia.com, joshualitt@google.com, joshualitt@chromium.org Author: kkinnunen@nvidia.com Review URL: https://codereview.chromium.org/367643004
* Simplify GrGLPathRendering interfaceGravatar kkinnunen2014-08-20
| | | | | | | | | | | | | | | | | | | | | | | Simplify GrGLPathRendering interface by removing polymorphism and functions that simply wrap GL functions unnecessarily. Replace the polymorphism by if -condition. Call the unconditional GL functions directly. GrGLPath, GrGLPathRange and GrGLPathRendering are part of the same logical subsystem. This means that the subsystem implementation details are taken into account within these classes. Example: if support for using conics would be added, the feature flag would go to GrGLPathRendering::Caps, the emulation would go to GrGLPath instead of GrGLPathRendering::pathCommands. Wrapping glPathCommandsNV is not useful. Try to expose the interface fully in same logical level; rename fragment input function to reflect this. R=bsalomon@google.com, cdalton@nvidia.com Author: kkinnunen@nvidia.com Review URL: https://codereview.chromium.org/450283002
* Separate GL path rendering state from GrGpuGL to GrGLPathRenderingGravatar kkinnunen2014-08-20
| | | | | | | | | | | | | | | | | | | Separate GL path rendering state from GrGpuGL to GrGLPathRendering. This makes GrGpuGL code simpler. The intention is that while GrGpuGL represents the global environment for GL, the GrGLPathRendering represents the global environment for path rendering extension. Add GrPathRendering, a base class for path rendering, and inherit GrGLPathRendering from that. Move the path rendering virtual functions from GrGpu to GrPathRendering. R=bsalomon@google.com, cdalton@nvidia.com Author: kkinnunen@nvidia.com Review URL: https://codereview.chromium.org/452823002
* Revert of Add GrResourceCache2. (patchset #4 of ↵Gravatar bsalomon2014-08-19
| | | | | | | | | | | | | | | | | | | | | | | https://codereview.chromium.org/481443002/) Reason for revert: Likely caused a leak detected in Chromium after last Skia roll. Original issue's description: > Add GrResourceCache2. > > Currently it just replaces GrGpu as the owner of the linked list of resources. > > Committed: https://skia.googlesource.com/skia/+/94ce9ac8624dbb45656b8f5c992fad9c9ff3ee5f R=mtklein@google.com, robertphillips@google.com TBR=mtklein@google.com, robertphillips@google.com NOTREECHECKS=true NOTRY=true Author: bsalomon@google.com Review URL: https://codereview.chromium.org/477323006
* Add GrResourceCache2.Gravatar bsalomon2014-08-19
| | | | | | | | | | Currently it just replaces GrGpu as the owner of the linked list of resources. R=robertphillips@google.com, mtklein@google.com Author: bsalomon@google.com Review URL: https://codereview.chromium.org/481443002
* Wrap NV_path_rendering API with GrGLPathRenderingGravatar cdalton2014-08-11
| | | | | | | | | | | | | | 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: R=bungeman@google.com, bsalomon@google.com, kkinnunen@nvidia.com Author: cdalton@nvidia.com Review URL: https://codereview.chromium.org/444223002
* Revert "Adds a GrGLPathRendering class that wraps the NV_path_rendering"Gravatar bungeman2014-08-06
| | | | | | | | | | | | | | | | | | This reverts commit 5672da0fa54f31c9727568e9dd5fe82c6e1585bc. This appears to be blocking the Skia roll by causing failures in the blink layout tests on the canvas-lost-gpu-context.html test. The bisect for this can be seen at: https://codereview.chromium.org/449473002/ Original issue's description: > 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. > > Committed: https://skia.googlesource.com/skia/+/5672da0fa54f31c9727568e9dd5fe82c6e1585bc
* Adds a GrGLPathRendering class that wraps the NV_path_renderingGravatar cdalton2014-08-04
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. R=bsalomon@google.com, kkinnunen@nvidia.com, markkilgard@gmail.com Author: cdalton@nvidia.com Review URL: https://codereview.chromium.org/437473002
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