Add functions to support NV_path_rendering in OpenGL ES

Add OpenGL ES extension functions needed to support NV_path_rendering in OpenGL
ES.

The added glProgramPathFragmentInputGenNV call is defined in NV_path_rendering
revision 30, similar to following:

    Append to the end of the "Shader Inputs" subsection of Section 3.12.2
    "Shader Execution":

    The command

        void ProgramPathFragmentInputGenNV(uint program,
                                           int location,
                                           enum genMode,
                                           int components,
                                           const float *coeffs);

    controls how a user-defined (non-built-in) fragment input of a
    GLSL program object is computed for fragment shading operations that
    occur as a result of CoverFillPathNV or CoverStrokePathNV.

    /program/ names a GLSL program object.  If /program/ has not been
    successfully linked, the error INVALID_OPERATION is generated.

    The given fragment input generation state is loaded into the fragment
    input variable location identified by /location/.  This location
    is a value returned either by GetProgramResourceLocation with a
    /programInterface/ of FRAGMENT_INPUT_NV and a given fragment shader
    input variable name or by GetProgramResourceiv with FRAGMENT_INPUT_NV
    for the /programInterface/ and LOCATION for the property for a given
    fragment input resource index.

    ....

glProgramPathFragmentInputGenNV will be used instead of glPathTexGen,
because the latter depends on fixed function pipeline that is not
exposed in ES.

Also add glGetProgramResourceLocation from OpenGL 4.3 or
ARB_program_interface_query.

Also add FRAGMENT_INPUT define to be used with glGetProgramResourceLocation.

The added functions are not used yet, but they're needed when implementing
NV_path_rendering support for OpenGL ES. They can also be used on OpenGL.

Remove uncalled NV_path_rendering functions, so they do not cause confusion
or take space in the interface definition. The ones that are later used
can be re-added when needed.

Remove definitions NV_path_rendering that are for NV_path_rendering function
parameters that are not used. The ones that are later used
can be re-added when needed.

R=bsalomon@google.com

Author: kkinnunen@nvidia.com

Review URL: https://codereview.chromium.org/345723002

7 files changed, 94 insertions, 263 deletions

diff --git a/include/gpu/gl/GrGLFunctions.h b/include/gpu/gl/GrGLFunctions.h
index 5ac77a2556..f31ae8a2a3 100644
--- a/include/gpu/gl/GrGLFunctions.h
+++ b/include/gpu/gl/GrGLFunctions.h
@@ -214,11 +214,14 @@ extern "C" {
     // Experimental: Functions for GL_NV_path_rendering. These will be
     // alphabetized with the above functions once this is fully supported
     // (and functions we are unlikely to use will possibly be omitted).
+    // EXT_direct_state_access
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLMatrixLoadfProc)(GrGLenum matrixMode, const GrGLfloat* m);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLMatrixLoadIdentityProc)(GrGLenum);
+    // ARB_program_interface_query
+    typedef GrGLint (GR_GL_FUNCTION_TYPE* GrGLGetProgramResourceLocationProc)(GrGLuint program, GrGLenum programInterface, const GrGLchar *name);
+    // NV_path_rendering
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathCommandsProc)(GrGLuint path, GrGLsizei numCommands, const GrGLubyte *commands, GrGLsizei numCoords, GrGLenum coordType, const GrGLvoid *coords);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathCoordsProc)(GrGLuint path, GrGLsizei numCoords, GrGLenum coordType, const GrGLvoid *coords);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathSubCommandsProc)(GrGLuint path, GrGLsizei commandStart, GrGLsizei commandsToDelete, GrGLsizei numCommands, const GrGLubyte *commands, GrGLsizei numCoords, GrGLenum coordType, const GrGLvoid *coords);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathSubCoordsProc)(GrGLuint path, GrGLsizei coordStart, GrGLsizei numCoords, GrGLenum coordType, const GrGLvoid *coords);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathStringProc)(GrGLuint path, GrGLenum format, GrGLsizei length, const GrGLvoid *pathString);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathGlyphsProc)(GrGLuint firstPathName, GrGLenum fontTarget, const GrGLvoid *fontName, GrGLbitfield fontStyle, GrGLsizei numGlyphs, GrGLenum type, const GrGLvoid *charcodes, GrGLenum handleMissingGlyphs, GrGLuint pathParameterTemplate, GrGLfloat emScale);
@@ -227,45 +230,22 @@ extern "C" {
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLCopyPathProc)(GrGLuint resultPath, GrGLuint srcPath);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLInterpolatePathsProc)(GrGLuint resultPath, GrGLuint pathA, GrGLuint pathB, GrGLfloat weight);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLTransformPathProc)(GrGLuint resultPath, GrGLuint srcPath, GrGLenum transformType, const GrGLfloat *transformValues);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathParameterivProc)(GrGLuint path, GrGLenum pname, const GrGLint *value);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathParameteriProc)(GrGLuint path, GrGLenum pname, GrGLint value);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathParameterfvProc)(GrGLuint path, GrGLenum pname, const GrGLfloat *value);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathParameterfProc)(GrGLuint path, GrGLenum pname, GrGLfloat value);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathDashArrayProc)(GrGLuint path, GrGLsizei dashCount, const GrGLfloat *dashArray);
     typedef GrGLuint (GR_GL_FUNCTION_TYPE* GrGLGenPathsProc)(GrGLsizei range);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLDeletePathsProc)(GrGLuint path, GrGLsizei range);
-    typedef GrGLboolean (GR_GL_FUNCTION_TYPE* GrGLIsPathProc)(GrGLuint path);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathStencilFuncProc)(GrGLenum func, GrGLint ref, GrGLuint mask);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathStencilDepthOffsetProc)(GrGLfloat factor, GrGLfloat units);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLStencilFillPathProc)(GrGLuint path, GrGLenum fillMode, GrGLuint mask);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLStencilStrokePathProc)(GrGLuint path, GrGLint reference, GrGLuint mask);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLStencilFillPathInstancedProc)(GrGLsizei numPaths, GrGLenum pathNameType, const GrGLvoid *paths, GrGLuint pathBase, GrGLenum fillMode, GrGLuint mask, GrGLenum transformType, const GrGLfloat *transformValues);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLStencilStrokePathInstancedProc)(GrGLsizei numPaths, GrGLenum pathNameType, const GrGLvoid *paths, GrGLuint pathBase, GrGLint reference, GrGLuint mask, GrGLenum transformType, const GrGLfloat *transformValues);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathCoverDepthFuncProc)(GrGLenum zfunc);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathColorGenProc)(GrGLenum color, GrGLenum genMode, GrGLenum colorFormat, const GrGLfloat *coeffs);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathTexGenProc)(GrGLenum texCoordSet, GrGLenum genMode, GrGLint components, const GrGLfloat *coeffs);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLPathFogGenProc)(GrGLenum genMode);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLCoverFillPathProc)(GrGLuint path, GrGLenum coverMode);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLCoverStrokePathProc)(GrGLuint name, GrGLenum coverMode);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLCoverFillPathInstancedProc)(GrGLsizei numPaths, GrGLenum pathNameType, const GrGLvoid *paths, GrGLuint pathBase, GrGLenum coverMode, GrGLenum transformType, const GrGLfloat *transformValues);
     typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLCoverStrokePathInstancedProc)(GrGLsizei numPaths, GrGLenum pathNameType, const GrGLvoid *paths, GrGLuint pathBase, GrGLenum coverMode, GrGLenum transformType, const GrGLfloat* transformValues);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetPathParameterivProc)(GrGLuint name, GrGLenum param, GrGLint *value);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetPathParameterfvProc)(GrGLuint name, GrGLenum param, GrGLfloat *value);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetPathCommandsProc)(GrGLuint name, GrGLubyte *commands);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetPathCoordsProc)(GrGLuint name, GrGLfloat *coords);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetPathDashArrayProc)(GrGLuint name, GrGLfloat *dashArray);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetPathMetricsProc)(GrGLbitfield metricQueryMask, GrGLsizei numPaths, GrGLenum pathNameType, const GrGLvoid *paths, GrGLuint pathBase, GrGLsizei stride, GrGLfloat *metrics);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetPathMetricRangeProc)(GrGLbitfield metricQueryMask, GrGLuint fistPathName, GrGLsizei numPaths, GrGLsizei stride, GrGLfloat *metrics);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetPathSpacingProc)(GrGLenum pathListMode, GrGLsizei numPaths, GrGLenum pathNameType, const GrGLvoid *paths, GrGLuint pathBase, GrGLfloat advanceScale, GrGLfloat kerningScale, GrGLenum transformType, GrGLfloat *returnedSpacing);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetPathColorGenivProc)(GrGLenum color, GrGLenum pname, GrGLint *value);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetPathColorGenfvProc)(GrGLenum color, GrGLenum pname, GrGLfloat *value);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetPathTexGenivProc)(GrGLenum texCoordSet, GrGLenum pname, GrGLint *value);
-    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLGetPathTexGenfvProc)(GrGLenum texCoordSet, GrGLenum pname, GrGLfloat *value);
-    typedef GrGLboolean (GR_GL_FUNCTION_TYPE* GrGLIsPointInFillPathProc)(GrGLuint path, GrGLuint mask, GrGLfloat x, GrGLfloat y);
-    typedef GrGLboolean (GR_GL_FUNCTION_TYPE* GrGLIsPointInStrokePathProc)(GrGLuint path, GrGLfloat x, GrGLfloat y);
-    typedef GrGLfloat (GR_GL_FUNCTION_TYPE* GrGLGetPathLengthProc)(GrGLuint path, GrGLsizei startSegment, GrGLsizei numSegments);
-    typedef GrGLboolean (GR_GL_FUNCTION_TYPE* GrGLPointAlongPathProc)(GrGLuint path, GrGLsizei startSegment, GrGLsizei numSegments, GrGLfloat distance, GrGLfloat *x, GrGLfloat *y, GrGLfloat *tangentX, GrGLfloat *tangentY);
 
+    typedef GrGLvoid (GR_GL_FUNCTION_TYPE* GrGLProgramPathFragmentInputGenProc)(GrGLuint program, GrGLint location, GrGLenum genMode, GrGLint components,const GrGLfloat *coeffs);
 }  // extern "C"
 
 #endif
diff --git a/include/gpu/gl/GrGLInterface.h b/include/gpu/gl/GrGLInterface.h
index 6c5ab24fdc..add7ee2567 100644
--- a/include/gpu/gl/GrGLInterface.h
+++ b/include/gpu/gl/GrGLInterface.h
@@ -317,55 +317,24 @@ public:
         // Experimental: Functions for GL_NV_path_rendering. These will be
         // alphabetized with the above functions once this is fully supported
         // (and functions we are unlikely to use will possibly be omitted).
+        GLPtr<GrGLGetProgramResourceLocationProc> fGetProgramResourceLocation;
         GLPtr<GrGLPathCommandsProc> fPathCommands;
         GLPtr<GrGLPathCoordsProc> fPathCoords;
-        GLPtr<GrGLPathSubCommandsProc> fPathSubCommands;
-        GLPtr<GrGLPathSubCoordsProc> fPathSubCoords;
-        GLPtr<GrGLPathStringProc> fPathString;
-        GLPtr<GrGLPathGlyphsProc> fPathGlyphs;
-        GLPtr<GrGLPathGlyphRangeProc> fPathGlyphRange;
-        GLPtr<GrGLWeightPathsProc> fWeightPaths;
-        GLPtr<GrGLCopyPathProc> fCopyPath;
-        GLPtr<GrGLInterpolatePathsProc> fInterpolatePaths;
-        GLPtr<GrGLTransformPathProc> fTransformPath;
-        GLPtr<GrGLPathParameterivProc> fPathParameteriv;
         GLPtr<GrGLPathParameteriProc> fPathParameteri;
-        GLPtr<GrGLPathParameterfvProc> fPathParameterfv;
         GLPtr<GrGLPathParameterfProc> fPathParameterf;
-        GLPtr<GrGLPathDashArrayProc> fPathDashArray;
         GLPtr<GrGLGenPathsProc> fGenPaths;
         GLPtr<GrGLDeletePathsProc> fDeletePaths;
-        GLPtr<GrGLIsPathProc> fIsPath;
         GLPtr<GrGLPathStencilFuncProc> fPathStencilFunc;
-        GLPtr<GrGLPathStencilDepthOffsetProc> fPathStencilDepthOffset;
         GLPtr<GrGLStencilFillPathProc> fStencilFillPath;
         GLPtr<GrGLStencilStrokePathProc> fStencilStrokePath;
         GLPtr<GrGLStencilFillPathInstancedProc> fStencilFillPathInstanced;
         GLPtr<GrGLStencilStrokePathInstancedProc> fStencilStrokePathInstanced;
-        GLPtr<GrGLPathCoverDepthFuncProc> fPathCoverDepthFunc;
-        GLPtr<GrGLPathColorGenProc> fPathColorGen;
         GLPtr<GrGLPathTexGenProc> fPathTexGen;
-        GLPtr<GrGLPathFogGenProc> fPathFogGen;
         GLPtr<GrGLCoverFillPathProc> fCoverFillPath;
         GLPtr<GrGLCoverStrokePathProc> fCoverStrokePath;
         GLPtr<GrGLCoverFillPathInstancedProc> fCoverFillPathInstanced;
         GLPtr<GrGLCoverStrokePathInstancedProc> fCoverStrokePathInstanced;
-        GLPtr<GrGLGetPathParameterivProc> fGetPathParameteriv;
-        GLPtr<GrGLGetPathParameterfvProc> fGetPathParameterfv;
-        GLPtr<GrGLGetPathCommandsProc> fGetPathCommands;
-        GLPtr<GrGLGetPathCoordsProc> fGetPathCoords;
-        GLPtr<GrGLGetPathDashArrayProc> fGetPathDashArray;
-        GLPtr<GrGLGetPathMetricsProc> fGetPathMetrics;
-        GLPtr<GrGLGetPathMetricRangeProc> fGetPathMetricRange;
-        GLPtr<GrGLGetPathSpacingProc> fGetPathSpacing;
-        GLPtr<GrGLGetPathColorGenivProc> fGetPathColorGeniv;
-        GLPtr<GrGLGetPathColorGenfvProc> fGetPathColorGenfv;
-        GLPtr<GrGLGetPathTexGenivProc> fGetPathTexGeniv;
-        GLPtr<GrGLGetPathTexGenfvProc> fGetPathTexGenfv;
-        GLPtr<GrGLIsPointInFillPathProc> fIsPointInFillPath;
-        GLPtr<GrGLIsPointInStrokePathProc> fIsPointInStrokePath;
-        GLPtr<GrGLGetPathLengthProc> fGetPathLength;
-        GLPtr<GrGLPointAlongPathProc> fPointAlongPath;
+        GLPtr<GrGLProgramPathFragmentInputGenProc> fProgramPathFragmentInputGen;
     } fFunctions;
 
     // Per-GL func callback
diff --git a/src/gpu/gl/GrGLAssembleGLESInterface.h b/src/gpu/gl/GrGLAssembleGLESInterface.h
index ddbc980929..2a3f4f6734 100644
--- a/src/gpu/gl/GrGLAssembleGLESInterface.h
+++ b/src/gpu/gl/GrGLAssembleGLESInterface.h
@@ -233,6 +233,38 @@ const GrGLInterface* GrGLAssembleGLESInterface(void* ctx, GrGLGetProc get) {
     GET_PROC(InvalidateTexImage);
     GET_PROC(InvalidateTexSubImage);
 
+    if (extensions.has("GL_EXT_direct_state_access")) {
+        GET_PROC_SUFFIX(MatrixLoadf, EXT);
+        GET_PROC_SUFFIX(MatrixLoadIdentity, EXT);
+    }
+
+#if USE_LINKED && GL_ES_VERSION_3_1
+    GET_LINKED(GetProgramResourceLocation);
+#else
+    if (version >= GR_GL_VER(3,1)) {            
+        GET_PROC(GetProgramResourceLocation);
+    }
+#endif
+
+    if (extensions.has("GL_NV_path_rendering")) {
+        GET_PROC_SUFFIX(PathCommands, NV);
+        GET_PROC_SUFFIX(PathCoords, NV);
+        GET_PROC_SUFFIX(PathParameteri, NV);
+        GET_PROC_SUFFIX(PathParameterf, NV);
+        GET_PROC_SUFFIX(GenPaths, NV);
+        GET_PROC_SUFFIX(DeletePaths, NV);
+        GET_PROC_SUFFIX(PathStencilFunc, NV);
+        GET_PROC_SUFFIX(StencilFillPath, NV);
+        GET_PROC_SUFFIX(StencilStrokePath, NV);
+        GET_PROC_SUFFIX(StencilFillPathInstanced, NV);
+        GET_PROC_SUFFIX(StencilStrokePathInstanced, NV);
+        GET_PROC_SUFFIX(CoverFillPath, NV);
+        GET_PROC_SUFFIX(CoverStrokePath, NV);
+        GET_PROC_SUFFIX(CoverFillPathInstanced, NV);
+        GET_PROC_SUFFIX(CoverStrokePathInstanced, NV);
+        GET_PROC_SUFFIX(ProgramPathFragmentInputGen, NV);
+    }
+
     interface->fStandard = kGLES_GrGLStandard;
     interface->fExtensions.swap(&extensions);
 
diff --git a/src/gpu/gl/GrGLAssembleInterface.cpp b/src/gpu/gl/GrGLAssembleInterface.cpp
index 98dabffe13..4c02a6eb58 100644
--- a/src/gpu/gl/GrGLAssembleInterface.cpp
+++ b/src/gpu/gl/GrGLAssembleInterface.cpp
@@ -224,53 +224,21 @@ const GrGLInterface* GrGLAssembleGLInterface(void* ctx, GrGLGetProc get) {
     if (extensions.has("GL_NV_path_rendering")) {
         GET_PROC_SUFFIX(PathCommands, NV);
         GET_PROC_SUFFIX(PathCoords, NV);
-        GET_PROC_SUFFIX(PathSubCommands, NV);
-        GET_PROC_SUFFIX(PathSubCoords, NV);
-        GET_PROC_SUFFIX(PathString, NV);
-        GET_PROC_SUFFIX(PathGlyphs, NV);
-        GET_PROC_SUFFIX(PathGlyphRange, NV);
-        GET_PROC_SUFFIX(WeightPaths, NV);
-        GET_PROC_SUFFIX(CopyPath, NV);
-        GET_PROC_SUFFIX(InterpolatePaths, NV);
-        GET_PROC_SUFFIX(TransformPath, NV);
-        GET_PROC_SUFFIX(PathParameteriv, NV);
         GET_PROC_SUFFIX(PathParameteri, NV);
-        GET_PROC_SUFFIX(PathParameterfv, NV);
         GET_PROC_SUFFIX(PathParameterf, NV);
-        GET_PROC_SUFFIX(PathDashArray, NV);
         GET_PROC_SUFFIX(GenPaths, NV);
         GET_PROC_SUFFIX(DeletePaths, NV);
-        GET_PROC_SUFFIX(IsPath, NV);
         GET_PROC_SUFFIX(PathStencilFunc, NV);
-        GET_PROC_SUFFIX(PathStencilDepthOffset, NV);
         GET_PROC_SUFFIX(StencilFillPath, NV);
         GET_PROC_SUFFIX(StencilStrokePath, NV);
         GET_PROC_SUFFIX(StencilFillPathInstanced, NV);
         GET_PROC_SUFFIX(StencilStrokePathInstanced, NV);
-        GET_PROC_SUFFIX(PathCoverDepthFunc, NV);
-        GET_PROC_SUFFIX(PathColorGen, NV);
         GET_PROC_SUFFIX(PathTexGen, NV);
-        GET_PROC_SUFFIX(PathFogGen, NV);
         GET_PROC_SUFFIX(CoverFillPath, NV);
         GET_PROC_SUFFIX(CoverStrokePath, NV);
         GET_PROC_SUFFIX(CoverFillPathInstanced, NV);
         GET_PROC_SUFFIX(CoverStrokePathInstanced, NV);
-        GET_PROC_SUFFIX(GetPathParameteriv, NV);
-        GET_PROC_SUFFIX(GetPathParameterfv, NV);
-        GET_PROC_SUFFIX(GetPathCommands, NV);
-        GET_PROC_SUFFIX(GetPathCoords, NV);
-        GET_PROC_SUFFIX(GetPathDashArray, NV);
-        GET_PROC_SUFFIX(GetPathMetrics, NV);
-        GET_PROC_SUFFIX(GetPathMetricRange, NV);
-        GET_PROC_SUFFIX(GetPathSpacing, NV);
-        GET_PROC_SUFFIX(GetPathColorGeniv, NV);
-        GET_PROC_SUFFIX(GetPathColorGenfv, NV);
-        GET_PROC_SUFFIX(GetPathTexGeniv, NV);
-        GET_PROC_SUFFIX(GetPathTexGenfv, NV);
-        GET_PROC_SUFFIX(IsPointInFillPath, NV);
-        GET_PROC_SUFFIX(IsPointInStrokePath, NV);
-        GET_PROC_SUFFIX(GetPathLength, NV);
-        GET_PROC_SUFFIX(PointAlongPath, NV);
+        GET_PROC_SUFFIX(ProgramPathFragmentInputGen, NV);
     }
 
     if (extensions.has("GL_EXT_debug_marker")) {
@@ -288,6 +256,10 @@ const GrGLInterface* GrGLAssembleGLInterface(void* ctx, GrGLGetProc get) {
         GET_PROC(InvalidateTexSubImage);
     }
 
+    if (glVer >= GR_GL_VER(4,3) || extensions.has("GL_ARB_program_interface_query")) {
+        GET_PROC(GetProgramResourceLocation);
+    }
+
     interface->fStandard = kGL_GrGLStandard;
     interface->fExtensions.swap(&extensions);
 
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index fdf6cacc08..94a295cf7e 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -312,7 +312,13 @@ bool GrGLCaps::init(const GrGLContextInfo& ctxInfo, const GrGLInterface* gli) {
     fMaxRenderTargetSize = SkTMin(fMaxTextureSize, fMaxRenderTargetSize);
 
     fPathRenderingSupport = ctxInfo.hasExtension("GL_NV_path_rendering") &&
-        ctxInfo.hasExtension("GL_EXT_direct_state_access");
+        ctxInfo.hasExtension("GL_EXT_direct_state_access") &&
+        (kGL_GrGLStandard == standard &&      
+         (ctxInfo.version() >= GR_GL_VER(4,3) ||
+          ctxInfo.hasExtension("GL_ARB_program_interface_query")));
+    // Note: path rendering is not yet implemented for GLES.
+    // Once it is, this will contain also:
+    // || (kGLES_GrGLStandard == standard && ctxInfo.version() >= GR_GL_VER(3,1))
 
     fGpuTracingSupport = ctxInfo.hasExtension("GL_EXT_debug_marker");
 
diff --git a/src/gpu/gl/GrGLDefines.h b/src/gpu/gl/GrGLDefines.h
index e2ddde88c4..1e8d7cc278 100644
--- a/src/gpu/gl/GrGLDefines.h
+++ b/src/gpu/gl/GrGLDefines.h
@@ -827,19 +827,6 @@
 #define GR_GL_ARC_TO                                        0xFE
 #define GR_GL_RELATIVE_ARC_TO                               0xFF
 
-// path string formats
-#define GR_GL_PATH_FORMAT_SVG                               0x9070
-#define GR_GL_PATH_FORMAT_PS                                0x9071
-
-// font targets
-#define GR_GL_STANDARD_FONT_NAME                            0x9072
-#define GR_GL_SYSTEM_FONT_NAME                              0x9073
-#define GR_GL_FILE_NAME                                     0x9074
-
-// handle missing glyphs
-#define GR_GL_SKIP_MISSING_GLYPH                            0x90A9
-#define GR_GL_USE_MISSING_GLYPH                             0x90AA
-
 // path parameters
 #define GR_GL_PATH_STROKE_WIDTH                             0x9075
 #define GR_GL_PATH_INITIAL_END_CAP                          0x9077
@@ -870,10 +857,6 @@
 #define GR_GL_COUNT_DOWN                                    0x9089
 /*      GL_PATH_FILL_MODE_NV */
 
-// path color gen
-/*      GL_PRIMARY_COLOR */
-#define GR_GL_SECONDARY_COLOR                               0x852D
-
 // gen mode
 /*      GL_NONE */
 /*      GL_EYE_LINEAR */
@@ -897,11 +880,6 @@
 #define GR_GL_TRANSPOSE_AFFINE_2D                           0x9096
 #define GR_GL_TRANSPOSE_AFFINE_3D                           0x9098
 
-// path string types
-#define GR_GL_UTF8                                          0x909A
-#define GR_GL_UTF16                                         0x909B
-
-#define GR_GL_PATH_COMPUTED_LENGTH                          0x90A0
 
 // cap/dash values
 /*      GL_FLAT */
@@ -916,60 +894,9 @@
 #define GR_GL_MITER_REVERT                                  0x90A7
 #define GR_GL_MITER_TRUNCATE                                0x90A8
 
-// path dash reset values
-#define GR_GL_MOVE_TO_RESETS                                0x90B5
-#define GR_GL_MOVE_TO_CONTINUES                             0x90B6
-
-// font styles
-/*      GL_NONE */
-#define GR_GL_BOLD_BIT                                      0x01
-#define GR_GL_ITALIC_BIT                                    0x02
-
-// pnames for glGet
-#define GR_GL_PATH_ERROR_POSITION                           0x90AB
-#define GR_GL_PATH_FOG_GEN_MODE                             0x90AC
-#define GR_GL_PATH_STENCIL_FUNC                             0x90B7
-#define GR_GL_PATH_STENCIL_REF                              0x90B8
-#define GR_GL_PATH_STENCIL_VALUE_MASK                       0x90B9
-#define GR_GL_PATH_STENCIL_DEPTH_OFFSET_FACTOR              0x90BD
-#define GR_GL_PATH_STENCIL_DEPTH_OFFSET_UNITS               0x90BE
-#define GR_GL_PATH_COVER_DEPTH_FUNC                         0x90BF
-
-// per-glyph metrics bits in metric mask query
-#define GR_GL_GLYPH_WIDTH_BIT                               0x01
-#define GR_GL_GLYPH_HEIGHT_BIT                              0x02
-#define GR_GL_GLYPH_HORIZONTAL_BEARING_X_BIT                0x04
-#define GR_GL_GLYPH_HORIZONTAL_BEARING_Y_BIT                0x08
-#define GR_GL_GLYPH_HORIZONTAL_BEARING_ADVANCE_BIT          0x10
-#define GR_GL_GLYPH_VERTICAL_BEARING_X_BIT                  0x20
-#define GR_GL_GLYPH_VERTICAL_BEARING_Y_BIT                  0x40
-#define GR_GL_GLYPH_VERTICAL_BEARING_ADVANCE_BIT            0x80
-#define GR_GL_GLYPH_HAS_KERNING                             0x100
-
-// per-font face metrics in metric mask query
-#define GR_GL_FONT_X_MIN_BOUNDS                             0x00010000
-#define GR_GL_FONT_Y_MIN_BOUNDS                             0x00020000
-#define GR_GL_FONT_X_MAX_BOUNDS                             0x00040000
-#define GR_GL_FONT_Y_MAX_BOUNDS                             0x00080000
-#define GR_GL_FONT_UNITS_PER_EM                             0x00100000
-#define GR_GL_FONT_ASCENDER                                 0x00200000
-#define GR_GL_FONT_DESCENDER                                0x00400000
-#define GR_GL_FONT_HEIGHT                                   0x00800000
-#define GR_GL_FONT_MAX_ADVANCE_WIDTH                        0x01000000
-#define GR_GL_FONT_MAX_ADVANCE_HEIGHT                       0x02000000
-#define GR_GL_FONT_UNDERLINE_POSITION                       0x04000000
-#define GR_GL_FONT_UNDERLINE_THICKNESS                      0x08000000
-#define GR_GL_FONT_HAS_KERNING                              0x10000000
-
-// path list modes (glGetPathSpacing)
-#define GR_GL_ACCUM_ADJACENT_PAIRS                          0x90AD
-#define GR_GL_ADJACENT_PAIRS                                0x90AE
-#define GR_GL_FIRST_TO_REST                                 0x90AF
-
-//path gen modes
-#define GR_GL_PATH_GEN_MODE                                 0x90B0
-#define GR_GL_PATH_GEN_COEFF                                0x90B1
-#define GR_GL_PATH_GEN_COLOR_FORMAT                         0x90B2
-#define GR_GL_PATH_GEN_COMPONENTS                           0x90B3
+// NV_path_rendering extension to ARB_program_interface_query:
+// .. corresponds to the set of active input variables used by the fragment
+// shader stage of <program> (if a fragment stage exists).
+#define GR_GL_FRAGMENT_INPUT                                0x936D
 
 #endif
diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
index b81d9ceeb8..825ad69029 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -39,57 +39,23 @@ const GrGLInterface* GrGLInterfaceRemoveNVPR(const GrGLInterface* interface) {
     GrGLInterface* newInterface = GrGLInterface::NewClone(interface);
 
     newInterface->fExtensions.remove("GL_NV_path_rendering");
-
     newInterface->fFunctions.fPathCommands = NULL;
     newInterface->fFunctions.fPathCoords = NULL;
-    newInterface->fFunctions.fPathSubCommands = NULL;
-    newInterface->fFunctions.fPathSubCoords = NULL;
-    newInterface->fFunctions.fPathString = NULL;
-    newInterface->fFunctions.fPathGlyphs = NULL;
-    newInterface->fFunctions.fPathGlyphRange = NULL;
-    newInterface->fFunctions.fWeightPaths = NULL;
-    newInterface->fFunctions.fCopyPath = NULL;
-    newInterface->fFunctions.fInterpolatePaths = NULL;
-    newInterface->fFunctions.fTransformPath = NULL;
-    newInterface->fFunctions.fPathParameteriv = NULL;
     newInterface->fFunctions.fPathParameteri = NULL;
-    newInterface->fFunctions.fPathParameterfv = NULL;
     newInterface->fFunctions.fPathParameterf = NULL;
-    newInterface->fFunctions.fPathDashArray = NULL;
     newInterface->fFunctions.fGenPaths = NULL;
     newInterface->fFunctions.fDeletePaths = NULL;
-    newInterface->fFunctions.fIsPath = NULL;
     newInterface->fFunctions.fPathStencilFunc = NULL;
-    newInterface->fFunctions.fPathStencilDepthOffset = NULL;
     newInterface->fFunctions.fStencilFillPath = NULL;
     newInterface->fFunctions.fStencilStrokePath = NULL;
     newInterface->fFunctions.fStencilFillPathInstanced = NULL;
     newInterface->fFunctions.fStencilStrokePathInstanced = NULL;
-    newInterface->fFunctions.fPathCoverDepthFunc = NULL;
-    newInterface->fFunctions.fPathColorGen = NULL;
     newInterface->fFunctions.fPathTexGen = NULL;
-    newInterface->fFunctions.fPathFogGen = NULL;
     newInterface->fFunctions.fCoverFillPath = NULL;
     newInterface->fFunctions.fCoverStrokePath = NULL;
     newInterface->fFunctions.fCoverFillPathInstanced = NULL;
     newInterface->fFunctions.fCoverStrokePathInstanced = NULL;
-    newInterface->fFunctions.fGetPathParameteriv = NULL;
-    newInterface->fFunctions.fGetPathParameterfv = NULL;
-    newInterface->fFunctions.fGetPathCommands = NULL;
-    newInterface->fFunctions.fGetPathCoords = NULL;
-    newInterface->fFunctions.fGetPathDashArray = NULL;
-    newInterface->fFunctions.fGetPathMetrics = NULL;
-    newInterface->fFunctions.fGetPathMetricRange = NULL;
-    newInterface->fFunctions.fGetPathSpacing = NULL;
-    newInterface->fFunctions.fGetPathColorGeniv = NULL;
-    newInterface->fFunctions.fGetPathColorGenfv = NULL;
-    newInterface->fFunctions.fGetPathTexGeniv = NULL;
-    newInterface->fFunctions.fGetPathTexGenfv = NULL;
-    newInterface->fFunctions.fIsPointInFillPath = NULL;
-    newInterface->fFunctions.fIsPointInStrokePath = NULL;
-    newInterface->fFunctions.fGetPathLength = NULL;
-    newInterface->fFunctions.fPointAlongPath = NULL;
-
+    newInterface->fFunctions.fProgramPathFragmentInputGen = NULL;
     return newInterface;
 }
 
@@ -292,65 +258,6 @@ bool GrGLInterface::validate() const {
                 RETURN_FALSE_INTERFACE
             }
         }
-        if (fExtensions.has("GL_EXT_direct_state_access")) {
-            if (NULL == fFunctions.fMatrixLoadf ||
-                NULL == fFunctions.fMatrixLoadIdentity) {
-                RETURN_FALSE_INTERFACE
-            }
-        }
-        if (fExtensions.has("GL_NV_path_rendering")) {
-            if (NULL == fFunctions.fPathCommands ||
-                NULL == fFunctions.fPathCoords ||
-                NULL == fFunctions.fPathSubCommands ||
-                NULL == fFunctions.fPathSubCoords ||
-                NULL == fFunctions.fPathString ||
-                NULL == fFunctions.fPathGlyphs ||
-                NULL == fFunctions.fPathGlyphRange ||
-                NULL == fFunctions.fWeightPaths ||
-                NULL == fFunctions.fCopyPath ||
-                NULL == fFunctions.fInterpolatePaths ||
-                NULL == fFunctions.fTransformPath ||
-                NULL == fFunctions.fPathParameteriv ||
-                NULL == fFunctions.fPathParameteri ||
-                NULL == fFunctions.fPathParameterfv ||
-                NULL == fFunctions.fPathParameterf ||
-                NULL == fFunctions.fPathDashArray ||
-                NULL == fFunctions.fGenPaths ||
-                NULL == fFunctions.fDeletePaths ||
-                NULL == fFunctions.fIsPath ||
-                NULL == fFunctions.fPathStencilFunc ||
-                NULL == fFunctions.fPathStencilDepthOffset ||
-                NULL == fFunctions.fStencilFillPath ||
-                NULL == fFunctions.fStencilStrokePath ||
-                NULL == fFunctions.fStencilFillPathInstanced ||
-                NULL == fFunctions.fStencilStrokePathInstanced ||
-                NULL == fFunctions.fPathCoverDepthFunc ||
-                NULL == fFunctions.fPathColorGen ||
-                NULL == fFunctions.fPathTexGen ||
-                NULL == fFunctions.fPathFogGen ||
-                NULL == fFunctions.fCoverFillPath ||
-                NULL == fFunctions.fCoverStrokePath ||
-                NULL == fFunctions.fCoverFillPathInstanced ||
-                NULL == fFunctions.fCoverStrokePathInstanced ||
-                NULL == fFunctions.fGetPathParameteriv ||
-                NULL == fFunctions.fGetPathParameterfv ||
-                NULL == fFunctions.fGetPathCommands ||
-                NULL == fFunctions.fGetPathCoords ||
-                NULL == fFunctions.fGetPathDashArray ||
-                NULL == fFunctions.fGetPathMetrics ||
-                NULL == fFunctions.fGetPathMetricRange ||
-                NULL == fFunctions.fGetPathSpacing ||
-                NULL == fFunctions.fGetPathColorGeniv ||
-                NULL == fFunctions.fGetPathColorGenfv ||
-                NULL == fFunctions.fGetPathTexGeniv ||
-                NULL == fFunctions.fGetPathTexGenfv ||
-                NULL == fFunctions.fIsPointInFillPath ||
-                NULL == fFunctions.fIsPointInStrokePath ||
-                NULL == fFunctions.fGetPathLength ||
-                NULL == fFunctions.fPointAlongPath) {
-                RETURN_FALSE_INTERFACE
-            }
-        }
     }
 
     // optional function on desktop before 1.3
@@ -526,5 +433,43 @@ bool GrGLInterface::validate() const {
             RETURN_FALSE_INTERFACE;
         }
     }
+    if (fExtensions.has("GL_EXT_direct_state_access")) {
+        if (NULL == fFunctions.fMatrixLoadf ||
+            NULL == fFunctions.fMatrixLoadIdentity) {
+            RETURN_FALSE_INTERFACE
+        }
+    }
+    if ((kGL_GrGLStandard == fStandard && glVer >= GR_GL_VER(4,3)) ||
+        fExtensions.has("GL_ARB_program_interface_query")) {
+        if (NULL == fFunctions.fGetProgramResourceLocation) {
+            RETURN_FALSE_INTERFACE
+        }
+    }
+    if (fExtensions.has("GL_NV_path_rendering")) {
+        if (NULL == fFunctions.fPathCommands ||
+            NULL == fFunctions.fPathCoords ||
+            NULL == fFunctions.fPathParameteri ||
+            NULL == fFunctions.fPathParameterf ||
+            NULL == fFunctions.fGenPaths ||
+            NULL == fFunctions.fDeletePaths ||
+            NULL == fFunctions.fPathStencilFunc ||
+            NULL == fFunctions.fStencilFillPath ||
+            NULL == fFunctions.fStencilStrokePath ||
+            NULL == fFunctions.fStencilFillPathInstanced ||
+            NULL == fFunctions.fStencilStrokePathInstanced ||
+            NULL == fFunctions.fCoverFillPath ||
+            NULL == fFunctions.fCoverStrokePath ||
+            NULL == fFunctions.fCoverFillPathInstanced ||
+            NULL == fFunctions.fCoverStrokePathInstanced) {
+            RETURN_FALSE_INTERFACE
+        }
+        // Currently ProgramPathFragmentInputGen is not used on
+        // OpenGL, rather PathTexGen is.
+        if ((kGL_GrGLStandard == fStandard && NULL == fFunctions.fPathTexGen) ||
+            (kGLES_GrGLStandard == fStandard && NULL == fFunctions.fProgramPathFragmentInputGen)) {
+            RETURN_FALSE_INTERFACE
+        }
+    }
+
     return true;
 }