Generate GrGLInterface and GrGlAssembleInterface* from table

This CL creates a go program that takes a JSON file of
GPU functions and creates the assemble and validate code
based on that.

This approach will hopefully will lessen the need for
"shotgun surgery" anytime a new function/extensions is added.

Additionally, it should be easier to add a new standard
(concretely, WebGL) using this technique.

There are a few potential bugs/mismatches in the current
implementation that this has identified, for example,
Requiring GL 3.x for adding a feature, but only verifying
it is there on GL 4.x - I did not attempt to correct these
bugs in the old version, as we will hopefully be able to delete
that version and use the generated files.

Bug: skia:8474, skia:8378
Change-Id: Ie8144bbab8e03f2c815fd942fa9f7f91dedba101
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/202137
Commit-Queue: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/gn/gpu.gni b/gn/gpu.gni
index e2e5463..26cdb32 100644
--- a/gn/gpu.gni
+++ b/gn/gpu.gni
@@ -420,10 +420,10 @@
   "$_src/gpu/text/GrTextBlobVertexRegenerator.cpp",
   "$_src/gpu/text/GrTextTarget.h",
 
-  "$_src/gpu/gl/GrGLAssembleInterface.cpp",
-  "$_src/gpu/gl/GrGLAssembleInterface_gl.cpp",
-  "$_src/gpu/gl/GrGLAssembleInterface_gles.cpp",
+  "$_src/gpu/gl/GrGLAssembleGLESInterfaceAutogen.cpp",
+  "$_src/gpu/gl/GrGLAssembleGLInterfaceAutogen.cpp",
   "$_src/gpu/gl/GrGLAssembleHelpers.cpp",
+  "$_src/gpu/gl/GrGLAssembleInterface.cpp",
   "$_src/gpu/gl/GrGLBuffer.cpp",
   "$_src/gpu/gl/GrGLBuffer.h",
   "$_src/gpu/gl/GrGLCaps.cpp",
@@ -441,7 +441,7 @@
   "$_src/gpu/gl/GrGLGpuCommandBuffer.h",
   "$_src/gpu/gl/GrGLGpuProgramCache.cpp",
   "$_src/gpu/gl/GrGLExtensions.cpp",
-  "$_src/gpu/gl/GrGLInterface.cpp",
+  "$_src/gpu/gl/GrGLInterfaceAutogen.cpp",
   "$_src/gpu/gl/GrGLIRect.h",
   "$_src/gpu/gl/GrGLProgram.cpp",
   "$_src/gpu/gl/GrGLProgram.h",
diff --git a/src/gpu/gl/GrGLAssembleGLESInterfaceAutogen.cpp b/src/gpu/gl/GrGLAssembleGLESInterfaceAutogen.cpp
new file mode 100644
index 0000000..0ed73d7
--- /dev/null
+++ b/src/gpu/gl/GrGLAssembleGLESInterfaceAutogen.cpp
@@ -0,0 +1,502 @@
+/*
+ * Copyright 2019 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * THIS FILE IS AUTOGENERATED
+ * Make edits to tools/gpu/gl/interface/templates.go or they will
+ * be overwritten.
+ */
+
+#include "gl/GrGLAssembleInterface.h"
+#include "gl/GrGLAssembleHelpers.h"
+#include "gl/GrGLUtil.h"
+
+#define GET_PROC(F) functions->f##F = (GrGL##F##Fn*)get(ctx, "gl" #F)
+#define GET_PROC_SUFFIX(F, S) functions->f##F = (GrGL##F##Fn*)get(ctx, "gl" #F #S)
+#define GET_PROC_LOCAL(F) GrGL##F##Fn* F = (GrGL##F##Fn*)get(ctx, "gl" #F)
+
+#define GET_EGL_PROC_SUFFIX(F, S) functions->fEGL##F = (GrEGL##F##Fn*)get(ctx, "egl" #F #S)
+
+#if SK_DISABLE_GL_ES_INTERFACE
+sk_sp<const GrGLInterface> GrGLMakeAssembledGLESInterface(void *ctx, GrGLGetProc get) {
+    return nullptr;
+}
+#else
+sk_sp<const GrGLInterface> GrGLMakeAssembledGLESInterface(void *ctx, GrGLGetProc get) {
+    GET_PROC_LOCAL(GetString);
+    if (nullptr == GetString) {
+        return nullptr;
+    }
+
+    const char* verStr = reinterpret_cast<const char*>(GetString(GR_GL_VERSION));
+    GrGLVersion glVer = GrGLGetVersionFromString(verStr);
+
+    if (glVer < GR_GL_VER(2,0)) {
+        return nullptr;
+    }
+
+    GET_PROC_LOCAL(GetIntegerv);
+    GET_PROC_LOCAL(GetStringi);
+    GrEGLQueryStringFn* queryString;
+    GrEGLDisplay display;
+    GrGetEGLQueryAndDisplay(&queryString, &display, ctx, get);
+    GrGLExtensions extensions;
+    if (!extensions.init(kGLES_GrGLStandard, GetString, GetStringi, GetIntegerv, queryString,
+                         display)) {
+        return nullptr;
+    }
+
+    sk_sp<GrGLInterface> interface(new GrGLInterface);
+    GrGLInterface::Functions* functions = &interface->fFunctions;
+
+    // Autogenerated content follows
+    GET_PROC(ActiveTexture);
+    GET_PROC(AttachShader);
+    GET_PROC(BindAttribLocation);
+    GET_PROC(BindBuffer);
+    GET_PROC(BindTexture);
+    GET_PROC(BlendColor);
+    GET_PROC(BlendEquation);
+    GET_PROC(BlendFunc);
+    GET_PROC(BufferData);
+    GET_PROC(BufferSubData);
+    GET_PROC(Clear);
+    GET_PROC(ClearColor);
+    GET_PROC(ClearStencil);
+    GET_PROC(ColorMask);
+    GET_PROC(CompileShader);
+    GET_PROC(CompressedTexImage2D);
+    GET_PROC(CompressedTexSubImage2D);
+    GET_PROC(CopyTexSubImage2D);
+    GET_PROC(CreateProgram);
+    GET_PROC(CreateShader);
+    GET_PROC(CullFace);
+    GET_PROC(DeleteBuffers);
+    GET_PROC(DeleteProgram);
+    GET_PROC(DeleteShader);
+    GET_PROC(DeleteTextures);
+    GET_PROC(DepthMask);
+    GET_PROC(Disable);
+    GET_PROC(DisableVertexAttribArray);
+    GET_PROC(DrawArrays);
+    GET_PROC(DrawElements);
+    GET_PROC(Enable);
+    GET_PROC(EnableVertexAttribArray);
+    GET_PROC(Finish);
+    GET_PROC(Flush);
+    GET_PROC(FrontFace);
+    GET_PROC(GenBuffers);
+    GET_PROC(GenTextures);
+    GET_PROC(GetBufferParameteriv);
+    GET_PROC(GetError);
+    GET_PROC(GetIntegerv);
+    GET_PROC(GetProgramInfoLog);
+    GET_PROC(GetProgramiv);
+    GET_PROC(GetShaderInfoLog);
+    GET_PROC(GetShaderiv);
+    GET_PROC(GetString);
+    GET_PROC(GetUniformLocation);
+    GET_PROC(IsTexture);
+    GET_PROC(LineWidth);
+    GET_PROC(LinkProgram);
+    GET_PROC(PixelStorei);
+    GET_PROC(ReadPixels);
+    GET_PROC(Scissor);
+    GET_PROC(ShaderSource);
+    GET_PROC(StencilFunc);
+    GET_PROC(StencilFuncSeparate);
+    GET_PROC(StencilMask);
+    GET_PROC(StencilMaskSeparate);
+    GET_PROC(StencilOp);
+    GET_PROC(StencilOpSeparate);
+    GET_PROC(TexImage2D);
+    GET_PROC(TexParameterf);
+    GET_PROC(TexParameterfv);
+    GET_PROC(TexParameteri);
+    GET_PROC(TexParameteriv);
+    GET_PROC(TexSubImage2D);
+    GET_PROC(Uniform1f);
+    GET_PROC(Uniform1fv);
+    GET_PROC(Uniform1i);
+    GET_PROC(Uniform1iv);
+    GET_PROC(Uniform2f);
+    GET_PROC(Uniform2fv);
+    GET_PROC(Uniform2i);
+    GET_PROC(Uniform2iv);
+    GET_PROC(Uniform3f);
+    GET_PROC(Uniform3fv);
+    GET_PROC(Uniform3i);
+    GET_PROC(Uniform3iv);
+    GET_PROC(Uniform4f);
+    GET_PROC(Uniform4fv);
+    GET_PROC(Uniform4i);
+    GET_PROC(Uniform4iv);
+    GET_PROC(UniformMatrix2fv);
+    GET_PROC(UniformMatrix3fv);
+    GET_PROC(UniformMatrix4fv);
+    GET_PROC(UseProgram);
+    GET_PROC(VertexAttrib1f);
+    GET_PROC(VertexAttrib2fv);
+    GET_PROC(VertexAttrib3fv);
+    GET_PROC(VertexAttrib4fv);
+    GET_PROC(VertexAttribPointer);
+    GET_PROC(Viewport);
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(GetStringi);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(BindVertexArray);
+        GET_PROC(DeleteVertexArrays);
+        GET_PROC(GenVertexArrays);
+    } else if (extensions.has("GL_OES_vertex_array_object")) {
+        GET_PROC_SUFFIX(BindVertexArray, OES);
+        GET_PROC_SUFFIX(DeleteVertexArrays, OES);
+        GET_PROC_SUFFIX(GenVertexArrays, OES);
+    }
+
+    if (glVer >= GR_GL_VER(3,0) && extensions.has("GL_EXT_blend_func_extended")) {
+        GET_PROC_SUFFIX(BindFragDataLocation, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,0) && extensions.has("GL_EXT_blend_func_extended")) {
+        GET_PROC_SUFFIX(BindFragDataLocationIndexed, EXT);
+    }
+
+    if (extensions.has("GL_KHR_blend_equation_advanced")) {
+        GET_PROC_SUFFIX(BlendBarrier, KHR);
+    } else if (extensions.has("GL_NV_blend_equation_advanced")) {
+        GET_PROC_SUFFIX(BlendBarrier, NV);
+    }
+
+    if (extensions.has("GL_EXT_clear_texture")) {
+        GET_PROC_SUFFIX(ClearTexImage, EXT);
+        GET_PROC_SUFFIX(ClearTexSubImage, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(DrawArraysInstanced);
+        GET_PROC(DrawElementsInstanced);
+    } else if (extensions.has("GL_EXT_draw_instanced")) {
+        GET_PROC_SUFFIX(DrawArraysInstanced, EXT);
+        GET_PROC_SUFFIX(DrawElementsInstanced, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(DrawBuffers);
+        GET_PROC(ReadBuffer);
+    }
+
+    if (glVer >= GR_GL_VER(3,1)) {
+        GET_PROC(DrawArraysIndirect);
+        GET_PROC(DrawElementsIndirect);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(DrawRangeElements);
+    }
+
+    if (glVer >= GR_GL_VER(3,1)) {
+        GET_PROC(GetMultisamplefv);
+    }
+
+    if (glVer >= GR_GL_VER(3,1)) {
+        GET_PROC(GetTexLevelParameteriv);
+    }
+
+    if (extensions.has("GL_EXT_multi_draw_indirect")) {
+        GET_PROC_SUFFIX(MultiDrawArraysIndirect, EXT);
+        GET_PROC_SUFFIX(MultiDrawElementsIndirect, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,2)) {
+        GET_PROC(TexBuffer);
+    } else if (extensions.has("GL_OES_texture_buffer")) {
+        GET_PROC_SUFFIX(TexBuffer, OES);
+    } else if (extensions.has("GL_EXT_texture_buffer")) {
+        GET_PROC_SUFFIX(TexBuffer, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,2)) {
+        GET_PROC(TexBufferRange);
+    } else if (extensions.has("GL_OES_texture_buffer")) {
+        GET_PROC_SUFFIX(TexBufferRange, OES);
+    } else if (extensions.has("GL_EXT_texture_buffer")) {
+        GET_PROC_SUFFIX(TexBufferRange, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(TexStorage2D);
+    } else if (extensions.has("GL_EXT_texture_storage")) {
+        GET_PROC_SUFFIX(TexStorage2D, EXT);
+    }
+
+    if (extensions.has("GL_NV_texture_barrier")) {
+        GET_PROC_SUFFIX(TextureBarrier, NV);
+    }
+
+    if (extensions.has("GL_EXT_discard_framebuffer")) {
+        GET_PROC_SUFFIX(DiscardFramebuffer, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(VertexAttribDivisor);
+    } else if (extensions.has("GL_EXT_instanced_arrays")) {
+        GET_PROC_SUFFIX(VertexAttribDivisor, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(VertexAttribIPointer);
+    }
+
+    GET_PROC(BindFramebuffer);
+    GET_PROC(BindRenderbuffer);
+    GET_PROC(CheckFramebufferStatus);
+    GET_PROC(DeleteFramebuffers);
+    GET_PROC(DeleteRenderbuffers);
+    GET_PROC(FramebufferRenderbuffer);
+    GET_PROC(FramebufferTexture2D);
+    GET_PROC(GenFramebuffers);
+    GET_PROC(GenRenderbuffers);
+    GET_PROC(GenerateMipmap);
+    GET_PROC(GetFramebufferAttachmentParameteriv);
+    GET_PROC(GetRenderbufferParameteriv);
+    GET_PROC(RenderbufferStorage);
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(BlitFramebuffer);
+    } else if (extensions.has("GL_CHROMIUM_framebuffer_multisample")) {
+        GET_PROC_SUFFIX(BlitFramebuffer, CHROMIUM);
+    } else if (extensions.has("GL_ANGLE_framebuffer_blit")) {
+        GET_PROC_SUFFIX(BlitFramebuffer, ANGLE);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(RenderbufferStorageMultisample);
+    } else if (extensions.has("GL_CHROMIUM_framebuffer_multisample")) {
+        GET_PROC_SUFFIX(RenderbufferStorageMultisample, CHROMIUM);
+    } else if (extensions.has("GL_ANGLE_framebuffer_multisample")) {
+        GET_PROC_SUFFIX(RenderbufferStorageMultisample, ANGLE);
+    }
+
+    if (extensions.has("GL_CHROMIUM_map_sub")) {
+        GET_PROC_SUFFIX(MapBufferSubData, CHROMIUM);
+        GET_PROC_SUFFIX(MapTexSubImage2D, CHROMIUM);
+        GET_PROC_SUFFIX(UnmapBufferSubData, CHROMIUM);
+        GET_PROC_SUFFIX(UnmapTexSubImage2D, CHROMIUM);
+    }
+
+    if (extensions.has("GL_EXT_multisampled_render_to_texture")) {
+        GET_PROC_SUFFIX(FramebufferTexture2DMultisample, EXT);
+    } else if (extensions.has("GL_IMG_multisampled_render_to_texture")) {
+        GET_PROC_SUFFIX(FramebufferTexture2DMultisample, IMG);
+    }
+
+    if (extensions.has("GL_EXT_multisampled_render_to_texture")) {
+        functions->fRenderbufferStorageMultisampleES2EXT =(GrGLRenderbufferStorageMultisampleFn*)get(ctx, "glRenderbufferStorageMultisampleEXT");
+    }
+
+    if (extensions.has("GL_IMG_multisampled_render_to_texture")) {
+        functions->fRenderbufferStorageMultisampleES2EXT =(GrGLRenderbufferStorageMultisampleFn*)get(ctx, "glRenderbufferStorageMultisampleIMG");
+    }
+
+    if (extensions.has("GL_APPLE_framebuffer_multisample")) {
+        GET_PROC_SUFFIX(ResolveMultisampleFramebuffer, APPLE);
+        functions->fRenderbufferStorageMultisampleES2APPLE =(GrGLRenderbufferStorageMultisampleFn*)get(ctx, "glRenderbufferStorageMultisampleAPPLE");
+    }
+
+    if (extensions.has("GL_OES_mapbuffer")) {
+        GET_PROC_SUFFIX(MapBuffer, OES);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(UnmapBuffer);
+    } else if (extensions.has("GL_OES_mapbuffer")) {
+        GET_PROC_SUFFIX(UnmapBuffer, OES);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(FlushMappedBufferRange);
+        GET_PROC(MapBufferRange);
+    } else if (extensions.has("GL_EXT_map_buffer_range")) {
+        GET_PROC_SUFFIX(FlushMappedBufferRange, EXT);
+        GET_PROC_SUFFIX(MapBufferRange, EXT);
+    }
+
+    if (extensions.has("GL_EXT_debug_marker")) {
+        GET_PROC_SUFFIX(InsertEventMarker, EXT);
+        GET_PROC_SUFFIX(PopGroupMarker, EXT);
+        GET_PROC_SUFFIX(PushGroupMarker, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,1)) {
+        GET_PROC(GetProgramResourceLocation);
+    }
+
+    if (extensions.has("GL_CHROMIUM_path_rendering")) {
+        GET_PROC_SUFFIX(MatrixLoadIdentity, CHROMIUM);
+        GET_PROC_SUFFIX(MatrixLoadf, CHROMIUM);
+    } else if (extensions.has("GL_NV_path_rendering")) {
+        GET_PROC_SUFFIX(MatrixLoadIdentity, EXT);
+        GET_PROC_SUFFIX(MatrixLoadf, EXT);
+    }
+
+    if (extensions.has("GL_CHROMIUM_path_rendering")) {
+        GET_PROC_SUFFIX(CoverFillPath, CHROMIUM);
+        GET_PROC_SUFFIX(CoverFillPathInstanced, CHROMIUM);
+        GET_PROC_SUFFIX(CoverStrokePath, CHROMIUM);
+        GET_PROC_SUFFIX(CoverStrokePathInstanced, CHROMIUM);
+        GET_PROC_SUFFIX(DeletePaths, CHROMIUM);
+        GET_PROC_SUFFIX(GenPaths, CHROMIUM);
+        GET_PROC_SUFFIX(IsPath, CHROMIUM);
+        GET_PROC_SUFFIX(PathCommands, CHROMIUM);
+        GET_PROC_SUFFIX(PathParameterf, CHROMIUM);
+        GET_PROC_SUFFIX(PathParameteri, CHROMIUM);
+        GET_PROC_SUFFIX(PathStencilFunc, CHROMIUM);
+        GET_PROC_SUFFIX(ProgramPathFragmentInputGen, CHROMIUM);
+        GET_PROC_SUFFIX(StencilFillPath, CHROMIUM);
+        GET_PROC_SUFFIX(StencilFillPathInstanced, CHROMIUM);
+        GET_PROC_SUFFIX(StencilStrokePath, CHROMIUM);
+        GET_PROC_SUFFIX(StencilStrokePathInstanced, CHROMIUM);
+        GET_PROC_SUFFIX(StencilThenCoverFillPath, CHROMIUM);
+        GET_PROC_SUFFIX(StencilThenCoverFillPathInstanced, CHROMIUM);
+        GET_PROC_SUFFIX(StencilThenCoverStrokePath, CHROMIUM);
+        GET_PROC_SUFFIX(StencilThenCoverStrokePathInstanced, CHROMIUM);
+    } else if (extensions.has("GL_NV_path_rendering")) {
+        GET_PROC_SUFFIX(CoverFillPath, NV);
+        GET_PROC_SUFFIX(CoverFillPathInstanced, NV);
+        GET_PROC_SUFFIX(CoverStrokePath, NV);
+        GET_PROC_SUFFIX(CoverStrokePathInstanced, NV);
+        GET_PROC_SUFFIX(DeletePaths, NV);
+        GET_PROC_SUFFIX(GenPaths, NV);
+        GET_PROC_SUFFIX(IsPath, NV);
+        GET_PROC_SUFFIX(PathCommands, NV);
+        GET_PROC_SUFFIX(PathParameterf, NV);
+        GET_PROC_SUFFIX(PathParameteri, NV);
+        GET_PROC_SUFFIX(PathStencilFunc, NV);
+        GET_PROC_SUFFIX(ProgramPathFragmentInputGen, NV);
+        GET_PROC_SUFFIX(StencilFillPath, NV);
+        GET_PROC_SUFFIX(StencilFillPathInstanced, NV);
+        GET_PROC_SUFFIX(StencilStrokePath, NV);
+        GET_PROC_SUFFIX(StencilStrokePathInstanced, NV);
+        GET_PROC_SUFFIX(StencilThenCoverFillPath, NV);
+        GET_PROC_SUFFIX(StencilThenCoverFillPathInstanced, NV);
+        GET_PROC_SUFFIX(StencilThenCoverStrokePath, NV);
+        GET_PROC_SUFFIX(StencilThenCoverStrokePathInstanced, NV);
+    }
+
+    if (extensions.has("GL_CHROMIUM_path_rendering")) {
+        GET_PROC_SUFFIX(BindFragmentInputLocation, CHROMIUM);
+    }
+
+    if (extensions.has("GL_CHROMIUM_framebuffer_mixed_samples")) {
+        GET_PROC_SUFFIX(CoverageModulation, CHROMIUM);
+    } else if (extensions.has("GL_NV_framebuffer_mixed_samples")) {
+        GET_PROC_SUFFIX(CoverageModulation, NV);
+    }
+
+    if (extensions.has("GL_KHR_debug")) {
+        GET_PROC_SUFFIX(DebugMessageCallback, KHR);
+        GET_PROC_SUFFIX(DebugMessageControl, KHR);
+        GET_PROC_SUFFIX(DebugMessageInsert, KHR);
+        GET_PROC_SUFFIX(GetDebugMessageLog, KHR);
+        GET_PROC_SUFFIX(ObjectLabel, KHR);
+        GET_PROC_SUFFIX(PopDebugGroup, KHR);
+        GET_PROC_SUFFIX(PushDebugGroup, KHR);
+    }
+
+    if (extensions.has("GL_CHROMIUM_bind_uniform_location")) {
+        GET_PROC_SUFFIX(BindUniformLocation, CHROMIUM);
+    }
+
+    if (extensions.has("GL_EXT_window_rectangles")) {
+        GET_PROC_SUFFIX(WindowRectangles, EXT);
+    }
+
+    if (extensions.has("EGL_KHR_image")) {
+        GET_EGL_PROC_SUFFIX(CreateImage, KHR);
+        GET_EGL_PROC_SUFFIX(DestroyImage, KHR);
+    } else if (extensions.has("EGL_KHR_image_base")) {
+        GET_EGL_PROC_SUFFIX(CreateImage, KHR);
+        GET_EGL_PROC_SUFFIX(DestroyImage, KHR);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(ClientWaitSync);
+        GET_PROC(DeleteSync);
+        GET_PROC(FenceSync);
+        GET_PROC(IsSync);
+        GET_PROC(WaitSync);
+    } else if (extensions.has("GL_APPLE_sync")) {
+        GET_PROC_SUFFIX(ClientWaitSync, APPLE);
+        GET_PROC_SUFFIX(DeleteSync, APPLE);
+        GET_PROC_SUFFIX(FenceSync, APPLE);
+        GET_PROC_SUFFIX(IsSync, APPLE);
+        GET_PROC_SUFFIX(WaitSync, APPLE);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(GetInternalformativ);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(GetProgramBinary);
+        GET_PROC(ProgramBinary);
+        GET_PROC(ProgramParameteri);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(BindSampler);
+        GET_PROC(DeleteSamplers);
+        GET_PROC(GenSamplers);
+        GET_PROC(SamplerParameteri);
+        GET_PROC(SamplerParameteriv);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(BeginQuery);
+        GET_PROC(DeleteQueries);
+        GET_PROC(EndQuery);
+        GET_PROC(GenQueries);
+        GET_PROC(GetQueryObjectuiv);
+        GET_PROC(GetQueryiv);
+    } else if (extensions.has("GL_EXT_occlusion_query_boolean")) {
+        GET_PROC_SUFFIX(BeginQuery, EXT);
+        GET_PROC_SUFFIX(DeleteQueries, EXT);
+        GET_PROC_SUFFIX(EndQuery, EXT);
+        GET_PROC_SUFFIX(GenQueries, EXT);
+        GET_PROC_SUFFIX(GetQueryObjectuiv, EXT);
+        GET_PROC_SUFFIX(GetQueryiv, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(InvalidateFramebuffer);
+        GET_PROC(InvalidateSubFramebuffer);
+    }
+
+    GET_PROC(GetShaderPrecisionFormat);
+
+
+    // End autogenerated content
+    // TODO(kjlubick): Do we want a feature that removes the extension if it doesn't have
+    // the function? This is common on some low-end GPUs.
+
+    if (extensions.has("GL_KHR_debug")) {
+        // In general we have a policy against removing extension strings when the driver does
+        // not provide function pointers for an advertised extension. However, because there is a
+        // known device that advertises GL_KHR_debug but fails to provide the functions and this is
+        // a debugging- only extension we've made an exception. This also can happen when using
+        // APITRACE.
+        if (!interface->fFunctions.fDebugMessageControl) {
+            extensions.remove("GL_KHR_debug");
+        }
+    }
+    interface->fStandard = kGLES_GrGLStandard;
+    interface->fExtensions.swap(&extensions);
+
+    return std::move(interface);
+}
+#endif
diff --git a/src/gpu/gl/GrGLAssembleGLInterfaceAutogen.cpp b/src/gpu/gl/GrGLAssembleGLInterfaceAutogen.cpp
new file mode 100644
index 0000000..31833c7
--- /dev/null
+++ b/src/gpu/gl/GrGLAssembleGLInterfaceAutogen.cpp
@@ -0,0 +1,504 @@
+/*
+ * Copyright 2019 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * THIS FILE IS AUTOGENERATED
+ * Make edits to tools/gpu/gl/interface/templates.go or they will
+ * be overwritten.
+ */
+
+#include "gl/GrGLAssembleInterface.h"
+#include "gl/GrGLAssembleHelpers.h"
+#include "gl/GrGLUtil.h"
+
+#define GET_PROC(F) functions->f##F = (GrGL##F##Fn*)get(ctx, "gl" #F)
+#define GET_PROC_SUFFIX(F, S) functions->f##F = (GrGL##F##Fn*)get(ctx, "gl" #F #S)
+#define GET_PROC_LOCAL(F) GrGL##F##Fn* F = (GrGL##F##Fn*)get(ctx, "gl" #F)
+
+#define GET_EGL_PROC_SUFFIX(F, S) functions->fEGL##F = (GrEGL##F##Fn*)get(ctx, "egl" #F #S)
+
+#if SK_DISABLE_GL_INTERFACE
+sk_sp<const GrGLInterface> GrGLMakeAssembledGLInterface(void *ctx, GrGLGetProc get) {
+    return nullptr;
+}
+#else
+sk_sp<const GrGLInterface> GrGLMakeAssembledGLInterface(void *ctx, GrGLGetProc get) {
+    GET_PROC_LOCAL(GetString);
+    GET_PROC_LOCAL(GetStringi);
+    GET_PROC_LOCAL(GetIntegerv);
+
+    // GetStringi may be nullptr depending on the GL version.
+    if (nullptr == GetString || nullptr == GetIntegerv) {
+        return nullptr;
+    }
+
+    const char* versionString = (const char*) GetString(GR_GL_VERSION);
+    GrGLVersion glVer = GrGLGetVersionFromString(versionString);
+
+    if (glVer < GR_GL_VER(2,0) || GR_GL_INVALID_VER == glVer) {
+        // This is our minimum for non-ES GL.
+        return nullptr;
+    }
+
+    GrEGLQueryStringFn* queryString;
+    GrEGLDisplay display;
+    GrGetEGLQueryAndDisplay(&queryString, &display, ctx, get);
+    GrGLExtensions extensions;
+    if (!extensions.init(kGL_GrGLStandard, GetString, GetStringi, GetIntegerv, queryString,
+                         display)) {
+        return nullptr;
+    }
+
+    sk_sp<GrGLInterface> interface(new GrGLInterface());
+    GrGLInterface::Functions* functions = &interface->fFunctions;
+
+    // Autogenerated content follows
+    GET_PROC(ActiveTexture);
+    GET_PROC(AttachShader);
+    GET_PROC(BindAttribLocation);
+    GET_PROC(BindBuffer);
+    GET_PROC(BindTexture);
+    GET_PROC(BlendColor);
+    GET_PROC(BlendEquation);
+    GET_PROC(BlendFunc);
+    GET_PROC(BufferData);
+    GET_PROC(BufferSubData);
+    GET_PROC(Clear);
+    GET_PROC(ClearColor);
+    GET_PROC(ClearStencil);
+    GET_PROC(ColorMask);
+    GET_PROC(CompileShader);
+    GET_PROC(CompressedTexImage2D);
+    GET_PROC(CompressedTexSubImage2D);
+    GET_PROC(CopyTexSubImage2D);
+    GET_PROC(CreateProgram);
+    GET_PROC(CreateShader);
+    GET_PROC(CullFace);
+    GET_PROC(DeleteBuffers);
+    GET_PROC(DeleteProgram);
+    GET_PROC(DeleteShader);
+    GET_PROC(DeleteTextures);
+    GET_PROC(DepthMask);
+    GET_PROC(Disable);
+    GET_PROC(DisableVertexAttribArray);
+    GET_PROC(DrawArrays);
+    GET_PROC(DrawElements);
+    GET_PROC(Enable);
+    GET_PROC(EnableVertexAttribArray);
+    GET_PROC(Finish);
+    GET_PROC(Flush);
+    GET_PROC(FrontFace);
+    GET_PROC(GenBuffers);
+    GET_PROC(GenTextures);
+    GET_PROC(GetBufferParameteriv);
+    GET_PROC(GetError);
+    GET_PROC(GetIntegerv);
+    GET_PROC(GetProgramInfoLog);
+    GET_PROC(GetProgramiv);
+    GET_PROC(GetShaderInfoLog);
+    GET_PROC(GetShaderiv);
+    GET_PROC(GetString);
+    GET_PROC(GetUniformLocation);
+    GET_PROC(IsTexture);
+    GET_PROC(LineWidth);
+    GET_PROC(LinkProgram);
+    GET_PROC(PixelStorei);
+    GET_PROC(ReadPixels);
+    GET_PROC(Scissor);
+    GET_PROC(ShaderSource);
+    GET_PROC(StencilFunc);
+    GET_PROC(StencilFuncSeparate);
+    GET_PROC(StencilMask);
+    GET_PROC(StencilMaskSeparate);
+    GET_PROC(StencilOp);
+    GET_PROC(StencilOpSeparate);
+    GET_PROC(TexImage2D);
+    GET_PROC(TexParameterf);
+    GET_PROC(TexParameterfv);
+    GET_PROC(TexParameteri);
+    GET_PROC(TexParameteriv);
+    GET_PROC(TexSubImage2D);
+    GET_PROC(Uniform1f);
+    GET_PROC(Uniform1fv);
+    GET_PROC(Uniform1i);
+    GET_PROC(Uniform1iv);
+    GET_PROC(Uniform2f);
+    GET_PROC(Uniform2fv);
+    GET_PROC(Uniform2i);
+    GET_PROC(Uniform2iv);
+    GET_PROC(Uniform3f);
+    GET_PROC(Uniform3fv);
+    GET_PROC(Uniform3i);
+    GET_PROC(Uniform3iv);
+    GET_PROC(Uniform4f);
+    GET_PROC(Uniform4fv);
+    GET_PROC(Uniform4i);
+    GET_PROC(Uniform4iv);
+    GET_PROC(UniformMatrix2fv);
+    GET_PROC(UniformMatrix3fv);
+    GET_PROC(UniformMatrix4fv);
+    GET_PROC(UseProgram);
+    GET_PROC(VertexAttrib1f);
+    GET_PROC(VertexAttrib2fv);
+    GET_PROC(VertexAttrib3fv);
+    GET_PROC(VertexAttrib4fv);
+    GET_PROC(VertexAttribPointer);
+    GET_PROC(Viewport);
+
+    GET_PROC(DrawBuffer);
+    GET_PROC(PolygonMode);
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(GetStringi);
+    }
+
+    GET_PROC(BindVertexArray);
+    GET_PROC(DeleteVertexArrays);
+    GET_PROC(GenVertexArrays);
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(BindFragDataLocation);
+    }
+
+    if (glVer >= GR_GL_VER(3,3)) {
+        GET_PROC(BindFragDataLocationIndexed);
+    } else if (extensions.has("GL_ARB_blend_func_extended")) {
+        GET_PROC(BindFragDataLocationIndexed);
+    }
+
+    if (extensions.has("GL_KHR_blend_equation_advanced")) {
+        GET_PROC_SUFFIX(BlendBarrier, KHR);
+    } else if (extensions.has("GL_NV_blend_equation_advanced")) {
+        GET_PROC_SUFFIX(BlendBarrier, NV);
+    }
+
+    if (glVer >= GR_GL_VER(4,4)) {
+        GET_PROC(ClearTexImage);
+        GET_PROC(ClearTexSubImage);
+    } else if (extensions.has("GL_ARB_clear_texture")) {
+        GET_PROC(ClearTexImage);
+        GET_PROC(ClearTexSubImage);
+    }
+
+    if (glVer >= GR_GL_VER(3,1)) {
+        GET_PROC(DrawArraysInstanced);
+        GET_PROC(DrawElementsInstanced);
+    } else if (extensions.has("GL_ARB_draw_instanced")) {
+        GET_PROC(DrawArraysInstanced);
+        GET_PROC(DrawElementsInstanced);
+    } else if (extensions.has("GL_EXT_draw_instanced")) {
+        GET_PROC_SUFFIX(DrawArraysInstanced, EXT);
+        GET_PROC_SUFFIX(DrawElementsInstanced, EXT);
+    }
+
+    GET_PROC(DrawBuffers);
+    GET_PROC(ReadBuffer);
+
+    if (glVer >= GR_GL_VER(4,0)) {
+        GET_PROC(DrawArraysIndirect);
+        GET_PROC(DrawElementsIndirect);
+    } else if (extensions.has("GL_ARB_draw_indirect")) {
+        GET_PROC(DrawArraysIndirect);
+        GET_PROC(DrawElementsIndirect);
+    }
+
+    GET_PROC(DrawRangeElements);
+
+    if (glVer >= GR_GL_VER(3,2)) {
+        GET_PROC(GetMultisamplefv);
+    } else if (extensions.has("GL_ARB_texture_multisample")) {
+        GET_PROC(GetMultisamplefv);
+    }
+
+    GET_PROC(GetTexLevelParameteriv);
+
+    if (glVer >= GR_GL_VER(4,3)) {
+        GET_PROC(MultiDrawArraysIndirect);
+        GET_PROC(MultiDrawElementsIndirect);
+    } else if (extensions.has("GL_ARB_multi_draw_indirect")) {
+        GET_PROC(MultiDrawArraysIndirect);
+        GET_PROC(MultiDrawElementsIndirect);
+    }
+
+    if (glVer >= GR_GL_VER(3,1)) {
+        GET_PROC(TexBuffer);
+    }
+
+    if (glVer >= GR_GL_VER(4,3)) {
+        GET_PROC(TexBufferRange);
+    }
+
+    if (glVer >= GR_GL_VER(4,2)) {
+        GET_PROC(TexStorage2D);
+    } else if (extensions.has("GL_ARB_texture_storage")) {
+        GET_PROC(TexStorage2D);
+    } else if (extensions.has("GL_EXT_texture_storage")) {
+        GET_PROC_SUFFIX(TexStorage2D, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(4,5)) {
+        GET_PROC(TextureBarrier);
+    } else if (extensions.has("GL_ARB_texture_barrier")) {
+        GET_PROC(TextureBarrier);
+    } else if (extensions.has("GL_NV_texture_barrier")) {
+        GET_PROC_SUFFIX(TextureBarrier, NV);
+    }
+
+    if (glVer >= GR_GL_VER(3,2)) {
+        GET_PROC(VertexAttribDivisor);
+    } else if (extensions.has("GL_ARB_instanced_arrays")) {
+        GET_PROC(VertexAttribDivisor);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(VertexAttribIPointer);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(BindFramebuffer);
+        GET_PROC(BindRenderbuffer);
+        GET_PROC(CheckFramebufferStatus);
+        GET_PROC(DeleteFramebuffers);
+        GET_PROC(DeleteRenderbuffers);
+        GET_PROC(FramebufferRenderbuffer);
+        GET_PROC(FramebufferTexture2D);
+        GET_PROC(GenFramebuffers);
+        GET_PROC(GenRenderbuffers);
+        GET_PROC(GenerateMipmap);
+        GET_PROC(GetFramebufferAttachmentParameteriv);
+        GET_PROC(GetRenderbufferParameteriv);
+        GET_PROC(RenderbufferStorage);
+    } else if (extensions.has("GL_ARB_framebuffer_object")) {
+        GET_PROC(BindFramebuffer);
+        GET_PROC(BindRenderbuffer);
+        GET_PROC(CheckFramebufferStatus);
+        GET_PROC(DeleteFramebuffers);
+        GET_PROC(DeleteRenderbuffers);
+        GET_PROC(FramebufferRenderbuffer);
+        GET_PROC(FramebufferTexture2D);
+        GET_PROC(GenFramebuffers);
+        GET_PROC(GenRenderbuffers);
+        GET_PROC(GenerateMipmap);
+        GET_PROC(GetFramebufferAttachmentParameteriv);
+        GET_PROC(GetRenderbufferParameteriv);
+        GET_PROC(RenderbufferStorage);
+    } else if (extensions.has("GL_EXT_framebuffer_object")) {
+        GET_PROC_SUFFIX(BindFramebuffer, EXT);
+        GET_PROC_SUFFIX(BindRenderbuffer, EXT);
+        GET_PROC_SUFFIX(CheckFramebufferStatus, EXT);
+        GET_PROC_SUFFIX(DeleteFramebuffers, EXT);
+        GET_PROC_SUFFIX(DeleteRenderbuffers, EXT);
+        GET_PROC_SUFFIX(FramebufferRenderbuffer, EXT);
+        GET_PROC_SUFFIX(FramebufferTexture2D, EXT);
+        GET_PROC_SUFFIX(GenFramebuffers, EXT);
+        GET_PROC_SUFFIX(GenRenderbuffers, EXT);
+        GET_PROC_SUFFIX(GenerateMipmap, EXT);
+        GET_PROC_SUFFIX(GetFramebufferAttachmentParameteriv, EXT);
+        GET_PROC_SUFFIX(GetRenderbufferParameteriv, EXT);
+        GET_PROC_SUFFIX(RenderbufferStorage, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(BlitFramebuffer);
+    } else if (extensions.has("GL_ARB_framebuffer_object")) {
+        GET_PROC(BlitFramebuffer);
+    } else if (extensions.has("GL_EXT_framebuffer_blit")) {
+        GET_PROC_SUFFIX(BlitFramebuffer, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(RenderbufferStorageMultisample);
+    } else if (extensions.has("GL_ARB_framebuffer_object")) {
+        GET_PROC(RenderbufferStorageMultisample);
+    } else if (extensions.has("GL_EXT_framebuffer_multisample")) {
+        GET_PROC_SUFFIX(RenderbufferStorageMultisample, EXT);
+    }
+
+    GET_PROC(MapBuffer);
+
+    GET_PROC(UnmapBuffer);
+
+    if (glVer >= GR_GL_VER(3,0)) {
+        GET_PROC(FlushMappedBufferRange);
+        GET_PROC(MapBufferRange);
+    } else if (extensions.has("GL_ARB_map_buffer_range")) {
+        GET_PROC(FlushMappedBufferRange);
+        GET_PROC(MapBufferRange);
+    }
+
+    if (extensions.has("GL_EXT_debug_marker")) {
+        GET_PROC_SUFFIX(InsertEventMarker, EXT);
+        GET_PROC_SUFFIX(PopGroupMarker, EXT);
+        GET_PROC_SUFFIX(PushGroupMarker, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(4,3)) {
+        GET_PROC(GetProgramResourceLocation);
+    } else if (extensions.has("GL_ARB_program_interface_query")) {
+        GET_PROC(GetProgramResourceLocation);
+    }
+
+    if (extensions.has("GL_NV_path_rendering")) {
+        GET_PROC_SUFFIX(MatrixLoadIdentity, EXT);
+        GET_PROC_SUFFIX(MatrixLoadf, EXT);
+    }
+
+    if (extensions.has("GL_NV_path_rendering")) {
+        GET_PROC_SUFFIX(CoverFillPath, NV);
+        GET_PROC_SUFFIX(CoverFillPathInstanced, NV);
+        GET_PROC_SUFFIX(CoverStrokePath, NV);
+        GET_PROC_SUFFIX(CoverStrokePathInstanced, NV);
+        GET_PROC_SUFFIX(DeletePaths, NV);
+        GET_PROC_SUFFIX(GenPaths, NV);
+        GET_PROC_SUFFIX(IsPath, NV);
+        GET_PROC_SUFFIX(PathCommands, NV);
+        GET_PROC_SUFFIX(PathParameterf, NV);
+        GET_PROC_SUFFIX(PathParameteri, NV);
+        GET_PROC_SUFFIX(PathStencilFunc, NV);
+        GET_PROC_SUFFIX(ProgramPathFragmentInputGen, NV);
+        GET_PROC_SUFFIX(StencilFillPath, NV);
+        GET_PROC_SUFFIX(StencilFillPathInstanced, NV);
+        GET_PROC_SUFFIX(StencilStrokePath, NV);
+        GET_PROC_SUFFIX(StencilStrokePathInstanced, NV);
+        GET_PROC_SUFFIX(StencilThenCoverFillPath, NV);
+        GET_PROC_SUFFIX(StencilThenCoverFillPathInstanced, NV);
+        GET_PROC_SUFFIX(StencilThenCoverStrokePath, NV);
+        GET_PROC_SUFFIX(StencilThenCoverStrokePathInstanced, NV);
+    }
+
+    if (extensions.has("GL_NV_framebuffer_mixed_samples")) {
+        GET_PROC_SUFFIX(CoverageModulation, NV);
+    }
+
+    if (glVer >= GR_GL_VER(4,3)) {
+        GET_PROC(DebugMessageCallback);
+        GET_PROC(DebugMessageControl);
+        GET_PROC(DebugMessageInsert);
+        GET_PROC(GetDebugMessageLog);
+        GET_PROC(ObjectLabel);
+        GET_PROC(PopDebugGroup);
+        GET_PROC(PushDebugGroup);
+    } else if (extensions.has("GL_KHR_debug")) {
+        GET_PROC(DebugMessageCallback);
+        GET_PROC(DebugMessageControl);
+        GET_PROC(DebugMessageInsert);
+        GET_PROC(GetDebugMessageLog);
+        GET_PROC(ObjectLabel);
+        GET_PROC(PopDebugGroup);
+        GET_PROC(PushDebugGroup);
+    }
+
+    if (extensions.has("GL_EXT_window_rectangles")) {
+        GET_PROC_SUFFIX(WindowRectangles, EXT);
+    }
+
+    if (extensions.has("EGL_KHR_image")) {
+        GET_EGL_PROC_SUFFIX(CreateImage, KHR);
+        GET_EGL_PROC_SUFFIX(DestroyImage, KHR);
+    } else if (extensions.has("EGL_KHR_image_base")) {
+        GET_EGL_PROC_SUFFIX(CreateImage, KHR);
+        GET_EGL_PROC_SUFFIX(DestroyImage, KHR);
+    }
+
+    if (glVer >= GR_GL_VER(3,2)) {
+        GET_PROC(ClientWaitSync);
+        GET_PROC(DeleteSync);
+        GET_PROC(FenceSync);
+        GET_PROC(IsSync);
+        GET_PROC(WaitSync);
+    } else if (extensions.has("GL_ARB_sync")) {
+        GET_PROC(ClientWaitSync);
+        GET_PROC(DeleteSync);
+        GET_PROC(FenceSync);
+        GET_PROC(IsSync);
+        GET_PROC(WaitSync);
+    }
+
+    if (glVer >= GR_GL_VER(4,2)) {
+        GET_PROC(GetInternalformativ);
+    } else if (extensions.has("GL_ARB_internalformat_query")) {
+        GET_PROC(GetInternalformativ);
+    }
+
+    if (glVer >= GR_GL_VER(4,1)) {
+        GET_PROC(GetProgramBinary);
+        GET_PROC(ProgramBinary);
+        GET_PROC(ProgramParameteri);
+    }
+
+    if (glVer >= GR_GL_VER(3,2)) {
+        GET_PROC(BindSampler);
+        GET_PROC(DeleteSamplers);
+        GET_PROC(GenSamplers);
+        GET_PROC(SamplerParameteri);
+        GET_PROC(SamplerParameteriv);
+    } else if (extensions.has("GL_ARB_sampler_objects")) {
+        GET_PROC(BindSampler);
+        GET_PROC(DeleteSamplers);
+        GET_PROC(GenSamplers);
+        GET_PROC(SamplerParameteri);
+        GET_PROC(SamplerParameteriv);
+    }
+
+    GET_PROC(GetQueryObjectiv);
+
+    GET_PROC(BeginQuery);
+    GET_PROC(DeleteQueries);
+    GET_PROC(EndQuery);
+    GET_PROC(GenQueries);
+    GET_PROC(GetQueryObjectuiv);
+    GET_PROC(GetQueryiv);
+
+    if (glVer >= GR_GL_VER(3,3)) {
+        GET_PROC(GetQueryObjecti64v);
+        GET_PROC(GetQueryObjectui64v);
+    } else if (extensions.has("GL_ARB_timer_query")) {
+        GET_PROC(GetQueryObjecti64v);
+        GET_PROC(GetQueryObjectui64v);
+    } else if (extensions.has("GL_EXT_timer_query")) {
+        GET_PROC_SUFFIX(GetQueryObjecti64v, EXT);
+        GET_PROC_SUFFIX(GetQueryObjectui64v, EXT);
+    }
+
+    if (glVer >= GR_GL_VER(3,3)) {
+        GET_PROC(QueryCounter);
+    } else if (extensions.has("GL_ARB_timer_query")) {
+        GET_PROC(QueryCounter);
+    }
+
+    if (glVer >= GR_GL_VER(4,3)) {
+        GET_PROC(InvalidateBufferData);
+        GET_PROC(InvalidateBufferSubData);
+        GET_PROC(InvalidateTexImage);
+        GET_PROC(InvalidateTexSubImage);
+    } else if (extensions.has("GL_ARB_invalidate_subdata")) {
+        GET_PROC(InvalidateBufferData);
+        GET_PROC(InvalidateBufferSubData);
+        GET_PROC(InvalidateTexImage);
+        GET_PROC(InvalidateTexSubImage);
+    }
+
+    if (glVer >= GR_GL_VER(4,3)) {
+        GET_PROC(InvalidateFramebuffer);
+        GET_PROC(InvalidateSubFramebuffer);
+    } else if (extensions.has("GL_ARB_invalidate_subdata")) {
+        GET_PROC(InvalidateFramebuffer);
+        GET_PROC(InvalidateSubFramebuffer);
+    }
+
+    if (glVer >= GR_GL_VER(4,3)) {
+        GET_PROC(GetShaderPrecisionFormat);
+    } else if (extensions.has("GL_ARB_ES2_compatibility")) {
+        GET_PROC(GetShaderPrecisionFormat);
+    }
+
+
+    // End autogenerated content
+    interface->fStandard = kGL_GrGLStandard;
+    interface->fExtensions.swap(&extensions);
+
+    return std::move(interface);
+}
+#endif
diff --git a/src/gpu/gl/GrGLAssembleInterface_gl.cpp b/src/gpu/gl/GrGLAssembleInterface_gl.cpp
index e4d3463..1c8527f 100644
--- a/src/gpu/gl/GrGLAssembleInterface_gl.cpp
+++ b/src/gpu/gl/GrGLAssembleInterface_gl.cpp
@@ -117,9 +117,8 @@
     GET_PROC(Flush);
     GET_PROC(FrontFace);
     GET_PROC(GenBuffers);
-    GET_PROC(GetBufferParameteriv);
-    GET_PROC(GetError);
-    GET_PROC(GetIntegerv);
+    GET_PROC(GenQueries);
+    GET_PROC(GenTextures);
     if (glVer >= GR_GL_VER(3,2) || extensions.has("GL_ARB_texture_multisample")) {
         GET_PROC(GetMultisamplefv);
     }
@@ -133,17 +132,18 @@
         GET_PROC_SUFFIX(GetQueryObjecti64v, EXT);
         GET_PROC_SUFFIX(GetQueryObjectui64v, EXT);
     }
-    GET_PROC(GetQueryiv);
+    GET_PROC(GetBufferParameteriv);
+    GET_PROC(GetError);
+    GET_PROC(GetIntegerv);
     GET_PROC(GetProgramInfoLog);
     GET_PROC(GetProgramiv);
+    GET_PROC(GetQueryiv);
     GET_PROC(GetShaderInfoLog);
+    GET_PROC(GetShaderPrecisionFormat);
     GET_PROC(GetShaderiv);
     GET_PROC(GetString);
     GET_PROC(GetStringi);
-    GET_PROC(GetShaderPrecisionFormat);
     GET_PROC(GetTexLevelParameteriv);
-    GET_PROC(GenQueries);
-    GET_PROC(GenTextures);
     GET_PROC(GetUniformLocation);
     GET_PROC(IsTexture);
     GET_PROC(LineWidth);
@@ -190,20 +190,20 @@
         GET_PROC_SUFFIX(TextureBarrier, NV);
     }
     GET_PROC(Uniform1f);
-    GET_PROC(Uniform1i);
     GET_PROC(Uniform1fv);
+    GET_PROC(Uniform1i);
     GET_PROC(Uniform1iv);
     GET_PROC(Uniform2f);
-    GET_PROC(Uniform2i);
     GET_PROC(Uniform2fv);
+    GET_PROC(Uniform2i);
     GET_PROC(Uniform2iv);
     GET_PROC(Uniform3f);
-    GET_PROC(Uniform3i);
     GET_PROC(Uniform3fv);
+    GET_PROC(Uniform3i);
     GET_PROC(Uniform3iv);
     GET_PROC(Uniform4f);
-    GET_PROC(Uniform4i);
     GET_PROC(Uniform4fv);
+    GET_PROC(Uniform4i);
     GET_PROC(Uniform4iv);
     GET_PROC(UniformMatrix2fv);
     GET_PROC(UniformMatrix3fv);
@@ -246,35 +246,35 @@
     // First look for GL3.0 FBO or GL_ARB_framebuffer_object (same since
     // GL_ARB_framebuffer_object doesn't use ARB suffix.)
     if (glVer >= GR_GL_VER(3,0) || extensions.has("GL_ARB_framebuffer_object")) {
-        GET_PROC(GenerateMipmap);
-        GET_PROC(GenFramebuffers);
-        GET_PROC(GetFramebufferAttachmentParameteriv);
-        GET_PROC(GetRenderbufferParameteriv);
         GET_PROC(BindFramebuffer);
-        GET_PROC(FramebufferTexture2D);
+        GET_PROC(BindRenderbuffer);
+        GET_PROC(BlitFramebuffer);
         GET_PROC(CheckFramebufferStatus);
         GET_PROC(DeleteFramebuffers);
-        GET_PROC(RenderbufferStorage);
-        GET_PROC(GenRenderbuffers);
         GET_PROC(DeleteRenderbuffers);
         GET_PROC(FramebufferRenderbuffer);
-        GET_PROC(BindRenderbuffer);
+        GET_PROC(FramebufferTexture2D);
+        GET_PROC(GenFramebuffers);
+        GET_PROC(GenRenderbuffers);
+        GET_PROC(GenerateMipmap);
+        GET_PROC(GetFramebufferAttachmentParameteriv);
+        GET_PROC(GetRenderbufferParameteriv);
+        GET_PROC(RenderbufferStorage);
         GET_PROC(RenderbufferStorageMultisample);
-        GET_PROC(BlitFramebuffer);
     } else if (extensions.has("GL_EXT_framebuffer_object")) {
-        GET_PROC_SUFFIX(GenerateMipmap, EXT);
-        GET_PROC_SUFFIX(GenFramebuffers, EXT);
-        GET_PROC_SUFFIX(GetFramebufferAttachmentParameteriv, EXT);
-        GET_PROC_SUFFIX(GetRenderbufferParameteriv, EXT);
         GET_PROC_SUFFIX(BindFramebuffer, EXT);
-        GET_PROC_SUFFIX(FramebufferTexture2D, EXT);
+        GET_PROC_SUFFIX(BindRenderbuffer, EXT);
         GET_PROC_SUFFIX(CheckFramebufferStatus, EXT);
         GET_PROC_SUFFIX(DeleteFramebuffers, EXT);
-        GET_PROC_SUFFIX(RenderbufferStorage, EXT);
-        GET_PROC_SUFFIX(GenRenderbuffers, EXT);
         GET_PROC_SUFFIX(DeleteRenderbuffers, EXT);
         GET_PROC_SUFFIX(FramebufferRenderbuffer, EXT);
-        GET_PROC_SUFFIX(BindRenderbuffer, EXT);
+        GET_PROC_SUFFIX(FramebufferTexture2D, EXT);
+        GET_PROC_SUFFIX(GenFramebuffers, EXT);
+        GET_PROC_SUFFIX(GenRenderbuffers, EXT);
+        GET_PROC_SUFFIX(GenerateMipmap, EXT);
+        GET_PROC_SUFFIX(GetFramebufferAttachmentParameteriv, EXT);
+        GET_PROC_SUFFIX(GetRenderbufferParameteriv, EXT);
+        GET_PROC_SUFFIX(RenderbufferStorage, EXT);
         if (extensions.has("GL_EXT_framebuffer_multisample")) {
             GET_PROC_SUFFIX(RenderbufferStorageMultisample, EXT);
         }
@@ -287,28 +287,29 @@
     }
 
     if (extensions.has("GL_NV_path_rendering")) {
-        GET_PROC_SUFFIX(MatrixLoadf, EXT);
         GET_PROC_SUFFIX(MatrixLoadIdentity, EXT);
-        GET_PROC_SUFFIX(PathCommands, NV);
-        GET_PROC_SUFFIX(PathParameteri, NV);
-        GET_PROC_SUFFIX(PathParameterf, NV);
-        GET_PROC_SUFFIX(GenPaths, NV);
-        GET_PROC_SUFFIX(DeletePaths, NV);
-        GET_PROC_SUFFIX(IsPath, 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(MatrixLoadf, EXT);
+
         GET_PROC_SUFFIX(CoverFillPath, NV);
-        GET_PROC_SUFFIX(CoverStrokePath, NV);
         GET_PROC_SUFFIX(CoverFillPathInstanced, NV);
+        GET_PROC_SUFFIX(CoverStrokePath, NV);
         GET_PROC_SUFFIX(CoverStrokePathInstanced, NV);
-        GET_PROC_SUFFIX(StencilThenCoverFillPath, NV);
-        GET_PROC_SUFFIX(StencilThenCoverStrokePath, NV);
-        GET_PROC_SUFFIX(StencilThenCoverFillPathInstanced, NV);
-        GET_PROC_SUFFIX(StencilThenCoverStrokePathInstanced, NV);
+        GET_PROC_SUFFIX(DeletePaths, NV);
+        GET_PROC_SUFFIX(GenPaths, NV);
+        GET_PROC_SUFFIX(IsPath, NV);
+        GET_PROC_SUFFIX(PathCommands, NV);
+        GET_PROC_SUFFIX(PathParameterf, NV);
+        GET_PROC_SUFFIX(PathParameteri, NV);
+        GET_PROC_SUFFIX(PathStencilFunc, NV);
         GET_PROC_SUFFIX(ProgramPathFragmentInputGen, NV);
+        GET_PROC_SUFFIX(StencilFillPath, NV);
+        GET_PROC_SUFFIX(StencilFillPathInstanced, NV);
+        GET_PROC_SUFFIX(StencilStrokePath, NV);
+        GET_PROC_SUFFIX(StencilStrokePathInstanced, NV);
+        GET_PROC_SUFFIX(StencilThenCoverFillPath, NV);
+        GET_PROC_SUFFIX(StencilThenCoverFillPathInstanced, NV);
+        GET_PROC_SUFFIX(StencilThenCoverStrokePath, NV);
+        GET_PROC_SUFFIX(StencilThenCoverStrokePathInstanced, NV);
     }
 
     if (extensions.has("GL_NV_framebuffer_mixed_samples")) {
@@ -355,11 +356,11 @@
     }
 
     if (glVer >= GR_GL_VER(3, 2) || extensions.has("GL_ARB_sync")) {
+        GET_PROC(ClientWaitSync);
+        GET_PROC(DeleteSync);
         GET_PROC(FenceSync);
         GET_PROC(IsSync);
-        GET_PROC(ClientWaitSync);
         GET_PROC(WaitSync);
-        GET_PROC(DeleteSync);
     }
 
     if (glVer >= GR_GL_VER(4,2) || extensions.has("GL_ARB_internalformat_query")) {
diff --git a/src/gpu/gl/GrGLAssembleInterface_gles.cpp b/src/gpu/gl/GrGLAssembleInterface_gles.cpp
index 8c9f8b4..bfe811a 100644
--- a/src/gpu/gl/GrGLAssembleInterface_gles.cpp
+++ b/src/gpu/gl/GrGLAssembleInterface_gles.cpp
@@ -334,53 +334,55 @@
     }
 
     if (extensions.has("GL_NV_path_rendering")) {
-        GET_PROC_SUFFIX(MatrixLoadf, EXT);
         GET_PROC_SUFFIX(MatrixLoadIdentity, EXT);
-        GET_PROC_SUFFIX(PathCommands, NV);
-        GET_PROC_SUFFIX(PathParameteri, NV);
-        GET_PROC_SUFFIX(PathParameterf, NV);
-        GET_PROC_SUFFIX(GenPaths, NV);
-        GET_PROC_SUFFIX(DeletePaths, NV);
-        GET_PROC_SUFFIX(IsPath, 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(MatrixLoadf, EXT);
+
         GET_PROC_SUFFIX(CoverFillPath, NV);
-        GET_PROC_SUFFIX(CoverStrokePath, NV);
         GET_PROC_SUFFIX(CoverFillPathInstanced, NV);
+        GET_PROC_SUFFIX(CoverStrokePath, NV);
         GET_PROC_SUFFIX(CoverStrokePathInstanced, NV);
-        GET_PROC_SUFFIX(StencilThenCoverFillPath, NV);
-        GET_PROC_SUFFIX(StencilThenCoverStrokePath, NV);
-        GET_PROC_SUFFIX(StencilThenCoverFillPathInstanced, NV);
-        GET_PROC_SUFFIX(StencilThenCoverStrokePathInstanced, NV);
+        GET_PROC_SUFFIX(DeletePaths, NV);
+        GET_PROC_SUFFIX(GenPaths, NV);
+        GET_PROC_SUFFIX(IsPath, NV);
+        GET_PROC_SUFFIX(PathCommands, NV);
+        GET_PROC_SUFFIX(PathParameterf, NV);
+        GET_PROC_SUFFIX(PathParameteri, NV);
+        GET_PROC_SUFFIX(PathStencilFunc, NV);
         GET_PROC_SUFFIX(ProgramPathFragmentInputGen, NV);
+        GET_PROC_SUFFIX(StencilFillPath, NV);
+        GET_PROC_SUFFIX(StencilFillPathInstanced, NV);
+        GET_PROC_SUFFIX(StencilStrokePath, NV);
+        GET_PROC_SUFFIX(StencilStrokePathInstanced, NV);
+        GET_PROC_SUFFIX(StencilThenCoverFillPath, NV);
+        GET_PROC_SUFFIX(StencilThenCoverFillPathInstanced, NV);
+        GET_PROC_SUFFIX(StencilThenCoverStrokePath, NV);
+        GET_PROC_SUFFIX(StencilThenCoverStrokePathInstanced, NV);
     }
 
     if (extensions.has("GL_CHROMIUM_path_rendering")) {
-        GET_PROC_SUFFIX(MatrixLoadf, CHROMIUM);
         GET_PROC_SUFFIX(MatrixLoadIdentity, CHROMIUM);
-        GET_PROC_SUFFIX(PathCommands, CHROMIUM);
-        GET_PROC_SUFFIX(PathParameteri, CHROMIUM);
-        GET_PROC_SUFFIX(PathParameterf, CHROMIUM);
-        GET_PROC_SUFFIX(GenPaths, CHROMIUM);
-        GET_PROC_SUFFIX(DeletePaths, CHROMIUM);
-        GET_PROC_SUFFIX(IsPath, CHROMIUM);
-        GET_PROC_SUFFIX(PathStencilFunc, CHROMIUM);
-        GET_PROC_SUFFIX(StencilFillPath, CHROMIUM);
-        GET_PROC_SUFFIX(StencilStrokePath, CHROMIUM);
-        GET_PROC_SUFFIX(StencilFillPathInstanced, CHROMIUM);
-        GET_PROC_SUFFIX(StencilStrokePathInstanced, CHROMIUM);
+        GET_PROC_SUFFIX(MatrixLoadf, CHROMIUM);
+
         GET_PROC_SUFFIX(CoverFillPath, CHROMIUM);
-        GET_PROC_SUFFIX(CoverStrokePath, CHROMIUM);
         GET_PROC_SUFFIX(CoverFillPathInstanced, CHROMIUM);
+        GET_PROC_SUFFIX(CoverStrokePath, CHROMIUM);
         GET_PROC_SUFFIX(CoverStrokePathInstanced, CHROMIUM);
-        GET_PROC_SUFFIX(StencilThenCoverFillPath, CHROMIUM);
-        GET_PROC_SUFFIX(StencilThenCoverStrokePath, CHROMIUM);
-        GET_PROC_SUFFIX(StencilThenCoverFillPathInstanced, CHROMIUM);
-        GET_PROC_SUFFIX(StencilThenCoverStrokePathInstanced, CHROMIUM);
+        GET_PROC_SUFFIX(DeletePaths, CHROMIUM);
+        GET_PROC_SUFFIX(GenPaths, CHROMIUM);
+        GET_PROC_SUFFIX(IsPath, CHROMIUM);
+        GET_PROC_SUFFIX(PathCommands, CHROMIUM);
+        GET_PROC_SUFFIX(PathParameterf, CHROMIUM);
+        GET_PROC_SUFFIX(PathParameteri, CHROMIUM);
+        GET_PROC_SUFFIX(PathStencilFunc, CHROMIUM);
         GET_PROC_SUFFIX(ProgramPathFragmentInputGen, CHROMIUM);
+        GET_PROC_SUFFIX(StencilFillPath, CHROMIUM);
+        GET_PROC_SUFFIX(StencilFillPathInstanced, CHROMIUM);
+        GET_PROC_SUFFIX(StencilStrokePath, CHROMIUM);
+        GET_PROC_SUFFIX(StencilStrokePathInstanced, CHROMIUM);
+        GET_PROC_SUFFIX(StencilThenCoverFillPath, CHROMIUM);
+        GET_PROC_SUFFIX(StencilThenCoverFillPathInstanced, CHROMIUM);
+        GET_PROC_SUFFIX(StencilThenCoverStrokePath, CHROMIUM);
+        GET_PROC_SUFFIX(StencilThenCoverStrokePathInstanced, CHROMIUM);
         // GL_CHROMIUM_path_rendering additions:
         GET_PROC_SUFFIX(BindFragmentInputLocation, CHROMIUM);
     }
@@ -424,17 +426,17 @@
     }
 
     if (version >= GR_GL_VER(3, 0)) {
+        GET_PROC(ClientWaitSync);
+        GET_PROC(DeleteSync);
         GET_PROC(FenceSync);
         GET_PROC(IsSync);
-        GET_PROC(ClientWaitSync);
         GET_PROC(WaitSync);
-        GET_PROC(DeleteSync);
     } else if (extensions.has("GL_APPLE_sync")) {
+        GET_PROC_SUFFIX(ClientWaitSync, APPLE);
+        GET_PROC_SUFFIX(DeleteSync, APPLE);
         GET_PROC_SUFFIX(FenceSync, APPLE);
         GET_PROC_SUFFIX(IsSync, APPLE);
-        GET_PROC_SUFFIX(ClientWaitSync, APPLE);
         GET_PROC_SUFFIX(WaitSync, APPLE);
-        GET_PROC_SUFFIX(DeleteSync, APPLE);
     }
 
     if (version >= GR_GL_VER(3,0)) {
diff --git a/src/gpu/gl/GrGLInterfaceAutogen.cpp b/src/gpu/gl/GrGLInterfaceAutogen.cpp
new file mode 100644
index 0000000..3e2de68
--- /dev/null
+++ b/src/gpu/gl/GrGLInterfaceAutogen.cpp
@@ -0,0 +1,702 @@
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * THIS FILE IS AUTOGENERATED
+ * Make edits to tools/gpu/gl/interface/templates.go or they will
+ * be overwritten.
+ */
+
+#include "gl/GrGLInterface.h"
+#include "gl/GrGLExtensions.h"
+#include "gl/GrGLUtil.h"
+
+#include <stdio.h>
+
+GrGLInterface::GrGLInterface() {
+    fStandard = kNone_GrGLStandard;
+}
+
+#define RETURN_FALSE_INTERFACE                                                 \
+    SkDEBUGF("%s:%d GrGLInterface::validate() failed.\n", __FILE__, __LINE__); \
+    return false
+
+bool GrGLInterface::validate() const {
+
+    if (kNone_GrGLStandard == fStandard) {
+        RETURN_FALSE_INTERFACE;
+    }
+
+    if (!fExtensions.isInitialized()) {
+        RETURN_FALSE_INTERFACE;
+    }
+
+    GrGLVersion glVer = GrGLGetVersion(this);
+    if (GR_GL_INVALID_VER == glVer) {
+        RETURN_FALSE_INTERFACE;
+    }
+    // Autogenerated content follows
+    if (!fFunctions.fActiveTexture ||
+        !fFunctions.fAttachShader ||
+        !fFunctions.fBindAttribLocation ||
+        !fFunctions.fBindBuffer ||
+        !fFunctions.fBindTexture ||
+        !fFunctions.fBlendColor ||
+        !fFunctions.fBlendEquation ||
+        !fFunctions.fBlendFunc ||
+        !fFunctions.fBufferData ||
+        !fFunctions.fBufferSubData ||
+        !fFunctions.fClear ||
+        !fFunctions.fClearColor ||
+        !fFunctions.fClearStencil ||
+        !fFunctions.fColorMask ||
+        !fFunctions.fCompileShader ||
+        !fFunctions.fCompressedTexImage2D ||
+        !fFunctions.fCompressedTexSubImage2D ||
+        !fFunctions.fCopyTexSubImage2D ||
+        !fFunctions.fCreateProgram ||
+        !fFunctions.fCreateShader ||
+        !fFunctions.fCullFace ||
+        !fFunctions.fDeleteBuffers ||
+        !fFunctions.fDeleteProgram ||
+        !fFunctions.fDeleteShader ||
+        !fFunctions.fDeleteTextures ||
+        !fFunctions.fDepthMask ||
+        !fFunctions.fDisable ||
+        !fFunctions.fDisableVertexAttribArray ||
+        !fFunctions.fDrawArrays ||
+        !fFunctions.fDrawElements ||
+        !fFunctions.fEnable ||
+        !fFunctions.fEnableVertexAttribArray ||
+        !fFunctions.fFinish ||
+        !fFunctions.fFlush ||
+        !fFunctions.fFrontFace ||
+        !fFunctions.fGenBuffers ||
+        !fFunctions.fGenTextures ||
+        !fFunctions.fGetBufferParameteriv ||
+        !fFunctions.fGetError ||
+        !fFunctions.fGetIntegerv ||
+        !fFunctions.fGetProgramInfoLog ||
+        !fFunctions.fGetProgramiv ||
+        !fFunctions.fGetShaderInfoLog ||
+        !fFunctions.fGetShaderiv ||
+        !fFunctions.fGetString ||
+        !fFunctions.fGetUniformLocation ||
+        !fFunctions.fIsTexture ||
+        !fFunctions.fLineWidth ||
+        !fFunctions.fLinkProgram ||
+        !fFunctions.fPixelStorei ||
+        !fFunctions.fReadPixels ||
+        !fFunctions.fScissor ||
+        !fFunctions.fShaderSource ||
+        !fFunctions.fStencilFunc ||
+        !fFunctions.fStencilFuncSeparate ||
+        !fFunctions.fStencilMask ||
+        !fFunctions.fStencilMaskSeparate ||
+        !fFunctions.fStencilOp ||
+        !fFunctions.fStencilOpSeparate ||
+        !fFunctions.fTexImage2D ||
+        !fFunctions.fTexParameterf ||
+        !fFunctions.fTexParameterfv ||
+        !fFunctions.fTexParameteri ||
+        !fFunctions.fTexParameteriv ||
+        !fFunctions.fTexSubImage2D ||
+        !fFunctions.fUniform1f ||
+        !fFunctions.fUniform1fv ||
+        !fFunctions.fUniform1i ||
+        !fFunctions.fUniform1iv ||
+        !fFunctions.fUniform2f ||
+        !fFunctions.fUniform2fv ||
+        !fFunctions.fUniform2i ||
+        !fFunctions.fUniform2iv ||
+        !fFunctions.fUniform3f ||
+        !fFunctions.fUniform3fv ||
+        !fFunctions.fUniform3i ||
+        !fFunctions.fUniform3iv ||
+        !fFunctions.fUniform4f ||
+        !fFunctions.fUniform4fv ||
+        !fFunctions.fUniform4i ||
+        !fFunctions.fUniform4iv ||
+        !fFunctions.fUniformMatrix2fv ||
+        !fFunctions.fUniformMatrix3fv ||
+        !fFunctions.fUniformMatrix4fv ||
+        !fFunctions.fUseProgram ||
+        !fFunctions.fVertexAttrib1f ||
+        !fFunctions.fVertexAttrib2fv ||
+        !fFunctions.fVertexAttrib3fv ||
+        !fFunctions.fVertexAttrib4fv ||
+        !fFunctions.fVertexAttribPointer ||
+        !fFunctions.fViewport) {
+        RETURN_FALSE_INTERFACE;
+    }
+
+    if (GR_IS_GR_GL(fStandard)) {
+        if (!fFunctions.fDrawBuffer ||
+            !fFunctions.fPolygonMode) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0))))) {
+        if (!fFunctions.fGetStringi) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if (GR_IS_GR_GL(fStandard) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_OES_vertex_array_object")))) {
+        if (!fFunctions.fBindVertexArray ||
+            !fFunctions.fDeleteVertexArrays ||
+            !fFunctions.fGenVertexArrays) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0) && fExtensions.has("GL_EXT_blend_func_extended"))))) {
+        if (!fFunctions.fBindFragDataLocation) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,3)) ||
+          fExtensions.has("GL_ARB_blend_func_extended"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0) && fExtensions.has("GL_EXT_blend_func_extended"))))) {
+        if (!fFunctions.fBindFragDataLocationIndexed) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          fExtensions.has("GL_KHR_blend_equation_advanced") ||
+          fExtensions.has("GL_NV_blend_equation_advanced"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_KHR_blend_equation_advanced") ||
+          fExtensions.has("GL_NV_blend_equation_advanced")))) {
+        if (!fFunctions.fBlendBarrier) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,4)) ||
+          fExtensions.has("GL_ARB_clear_texture"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_EXT_clear_texture")))) {
+        if (!fFunctions.fClearTexImage ||
+            !fFunctions.fClearTexSubImage) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,1)) ||
+          fExtensions.has("GL_ARB_draw_instanced") ||
+          fExtensions.has("GL_EXT_draw_instanced"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_EXT_draw_instanced")))) {
+        if (!fFunctions.fDrawArraysInstanced ||
+            !fFunctions.fDrawElementsInstanced) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if (GR_IS_GR_GL(fStandard) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0))))) {
+        if (!fFunctions.fDrawBuffers ||
+            !fFunctions.fReadBuffer) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,0)) ||
+          fExtensions.has("GL_ARB_draw_indirect"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,1))))) {
+        if (!fFunctions.fDrawArraysIndirect ||
+            !fFunctions.fDrawElementsIndirect) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if (GR_IS_GR_GL(fStandard) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0))))) {
+        if (!fFunctions.fDrawRangeElements) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,2)) ||
+          fExtensions.has("GL_ARB_texture_multisample"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,1))))) {
+        if (!fFunctions.fGetMultisamplefv) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if (GR_IS_GR_GL(fStandard) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,1))))) {
+        if (!fFunctions.fGetTexLevelParameteriv) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,3)) ||
+          fExtensions.has("GL_ARB_multi_draw_indirect"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_EXT_multi_draw_indirect")))) {
+        if (!fFunctions.fMultiDrawArraysIndirect ||
+            !fFunctions.fMultiDrawElementsIndirect) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,1)))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,2)) ||
+          fExtensions.has("GL_OES_texture_buffer") ||
+          fExtensions.has("GL_EXT_texture_buffer")))) {
+        if (!fFunctions.fTexBuffer) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,3)))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,2)) ||
+          fExtensions.has("GL_OES_texture_buffer") ||
+          fExtensions.has("GL_EXT_texture_buffer")))) {
+        if (!fFunctions.fTexBufferRange) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,2)) ||
+          fExtensions.has("GL_ARB_texture_storage") ||
+          fExtensions.has("GL_EXT_texture_storage"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_EXT_texture_storage")))) {
+        if (!fFunctions.fTexStorage2D) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,5)) ||
+          fExtensions.has("GL_ARB_texture_barrier") ||
+          fExtensions.has("GL_NV_texture_barrier"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_NV_texture_barrier")))) {
+        if (!fFunctions.fTextureBarrier) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_EXT_discard_framebuffer")))) {
+        if (!fFunctions.fDiscardFramebuffer) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,2)) ||
+          fExtensions.has("GL_ARB_instanced_arrays"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_EXT_instanced_arrays")))) {
+        if (!fFunctions.fVertexAttribDivisor) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0))))) {
+        if (!fFunctions.fVertexAttribIPointer) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_ARB_framebuffer_object") ||
+          fExtensions.has("GL_EXT_framebuffer_object"))) ||
+       GR_IS_GR_GL_ES(fStandard)) {
+        if (!fFunctions.fBindFramebuffer ||
+            !fFunctions.fBindRenderbuffer ||
+            !fFunctions.fCheckFramebufferStatus ||
+            !fFunctions.fDeleteFramebuffers ||
+            !fFunctions.fDeleteRenderbuffers ||
+            !fFunctions.fFramebufferRenderbuffer ||
+            !fFunctions.fFramebufferTexture2D ||
+            !fFunctions.fGenFramebuffers ||
+            !fFunctions.fGenRenderbuffers ||
+            !fFunctions.fGenerateMipmap ||
+            !fFunctions.fGetFramebufferAttachmentParameteriv ||
+            !fFunctions.fGetRenderbufferParameteriv ||
+            !fFunctions.fRenderbufferStorage) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_ARB_framebuffer_object") ||
+          fExtensions.has("GL_EXT_framebuffer_blit"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_CHROMIUM_framebuffer_multisample") ||
+          fExtensions.has("GL_ANGLE_framebuffer_blit")))) {
+        if (!fFunctions.fBlitFramebuffer) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_ARB_framebuffer_object") ||
+          fExtensions.has("GL_EXT_framebuffer_multisample"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_CHROMIUM_framebuffer_multisample") ||
+          fExtensions.has("GL_ANGLE_framebuffer_multisample")))) {
+        if (!fFunctions.fRenderbufferStorageMultisample) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_CHROMIUM_map_sub")))) {
+        if (!fFunctions.fMapBufferSubData ||
+            !fFunctions.fMapTexSubImage2D ||
+            !fFunctions.fUnmapBufferSubData ||
+            !fFunctions.fUnmapTexSubImage2D) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_EXT_multisampled_render_to_texture") ||
+          fExtensions.has("GL_IMG_multisampled_render_to_texture")))) {
+        if (!fFunctions.fFramebufferTexture2DMultisample) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_EXT_multisampled_render_to_texture")))) {
+        if (!fFunctions.fRenderbufferStorageMultisampleES2EXT) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_IMG_multisampled_render_to_texture")))) {
+        if (!fFunctions.fRenderbufferStorageMultisampleES2EXT) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_APPLE_framebuffer_multisample")))) {
+        if (!fFunctions.fResolveMultisampleFramebuffer ||
+            !fFunctions.fRenderbufferStorageMultisampleES2APPLE) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if (GR_IS_GR_GL(fStandard) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_OES_mapbuffer")))) {
+        if (!fFunctions.fMapBuffer) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if (GR_IS_GR_GL(fStandard) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_OES_mapbuffer")))) {
+        if (!fFunctions.fUnmapBuffer) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_ARB_map_buffer_range"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_EXT_map_buffer_range")))) {
+        if (!fFunctions.fFlushMappedBufferRange ||
+            !fFunctions.fMapBufferRange) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          fExtensions.has("GL_EXT_debug_marker"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_EXT_debug_marker")))) {
+        if (!fFunctions.fInsertEventMarker ||
+            !fFunctions.fPopGroupMarker ||
+            !fFunctions.fPushGroupMarker) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,3)) ||
+          fExtensions.has("GL_ARB_program_interface_query"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,1))))) {
+        if (!fFunctions.fGetProgramResourceLocation) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          fExtensions.has("GL_NV_path_rendering"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_CHROMIUM_path_rendering") ||
+          fExtensions.has("GL_NV_path_rendering")))) {
+        if (!fFunctions.fMatrixLoadIdentity ||
+            !fFunctions.fMatrixLoadf) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          fExtensions.has("GL_NV_path_rendering"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_CHROMIUM_path_rendering") ||
+          fExtensions.has("GL_NV_path_rendering")))) {
+        if (!fFunctions.fCoverFillPath ||
+            !fFunctions.fCoverFillPathInstanced ||
+            !fFunctions.fCoverStrokePath ||
+            !fFunctions.fCoverStrokePathInstanced ||
+            !fFunctions.fDeletePaths ||
+            !fFunctions.fGenPaths ||
+            !fFunctions.fIsPath ||
+            !fFunctions.fPathCommands ||
+            !fFunctions.fPathParameterf ||
+            !fFunctions.fPathParameteri ||
+            !fFunctions.fPathStencilFunc ||
+            !fFunctions.fStencilFillPath ||
+            !fFunctions.fStencilFillPathInstanced ||
+            !fFunctions.fStencilStrokePath ||
+            !fFunctions.fStencilStrokePathInstanced) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_CHROMIUM_path_rendering")))) {
+        if (!fFunctions.fBindFragmentInputLocation) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          fExtensions.has("GL_NV_framebuffer_mixed_samples"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_CHROMIUM_framebuffer_mixed_samples") ||
+          fExtensions.has("GL_NV_framebuffer_mixed_samples")))) {
+        if (!fFunctions.fCoverageModulation) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,3)) ||
+          fExtensions.has("GL_KHR_debug"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_KHR_debug")))) {
+        if (!fFunctions.fDebugMessageCallback ||
+            !fFunctions.fDebugMessageControl ||
+            !fFunctions.fDebugMessageInsert ||
+            !fFunctions.fGetDebugMessageLog ||
+            !fFunctions.fObjectLabel ||
+            !fFunctions.fPopDebugGroup ||
+            !fFunctions.fPushDebugGroup) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_CHROMIUM_bind_uniform_location")))) {
+        if (!fFunctions.fBindUniformLocation) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          fExtensions.has("GL_EXT_window_rectangles"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("GL_EXT_window_rectangles")))) {
+        if (!fFunctions.fWindowRectangles) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          fExtensions.has("EGL_KHR_image") ||
+          fExtensions.has("EGL_KHR_image_base"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          fExtensions.has("EGL_KHR_image") ||
+          fExtensions.has("EGL_KHR_image_base")))) {
+        if (!fFunctions.fEGLCreateImage ||
+            !fFunctions.fEGLDestroyImage) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,2)) ||
+          fExtensions.has("GL_ARB_sync"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_APPLE_sync")))) {
+        if (!fFunctions.fClientWaitSync ||
+            !fFunctions.fDeleteSync ||
+            !fFunctions.fFenceSync ||
+            !fFunctions.fIsSync ||
+            !fFunctions.fWaitSync) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,2)) ||
+          fExtensions.has("GL_ARB_internalformat_query"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0))))) {
+        if (!fFunctions.fGetInternalformativ) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,1)))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0))))) {
+        if (!fFunctions.fGetProgramBinary ||
+            !fFunctions.fProgramBinary ||
+            !fFunctions.fProgramParameteri) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,2)) ||
+          fExtensions.has("GL_ARB_sampler_objects"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0))))) {
+        if (!fFunctions.fBindSampler ||
+            !fFunctions.fDeleteSamplers ||
+            !fFunctions.fGenSamplers ||
+            !fFunctions.fSamplerParameteri ||
+            !fFunctions.fSamplerParameteriv) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if (GR_IS_GR_GL(fStandard)) {
+        if (!fFunctions.fGetQueryObjectiv) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if (GR_IS_GR_GL(fStandard) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0)) ||
+          fExtensions.has("GL_EXT_occlusion_query_boolean")))) {
+        // all functions were marked optional
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,3)) ||
+          fExtensions.has("GL_ARB_timer_query") ||
+          fExtensions.has("GL_EXT_timer_query")))) {
+        if (!fFunctions.fGetQueryObjecti64v ||
+            !fFunctions.fGetQueryObjectui64v) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(3,3)) ||
+          fExtensions.has("GL_ARB_timer_query")))) {
+        if (!fFunctions.fQueryCounter) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,3)) ||
+          fExtensions.has("GL_ARB_invalidate_subdata")))) {
+        if (!fFunctions.fInvalidateBufferData ||
+            !fFunctions.fInvalidateBufferSubData ||
+            !fFunctions.fInvalidateTexImage ||
+            !fFunctions.fInvalidateTexSubImage) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,3)) ||
+          fExtensions.has("GL_ARB_invalidate_subdata"))) ||
+       (GR_IS_GR_GL_ES(fStandard) && (
+          (glVer >= GR_GL_VER(3,0))))) {
+        if (!fFunctions.fInvalidateFramebuffer ||
+            !fFunctions.fInvalidateSubFramebuffer) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+    if ((GR_IS_GR_GL(fStandard) && (
+          (glVer >= GR_GL_VER(4,3)) ||
+          fExtensions.has("GL_ARB_ES2_compatibility"))) ||
+       GR_IS_GR_GL_ES(fStandard)) {
+        if (!fFunctions.fGetShaderPrecisionFormat) {
+            RETURN_FALSE_INTERFACE;
+        }
+    }
+
+
+    // End autogenerated content
+    return true;
+}
+
+#if GR_TEST_UTILS
+
+void GrGLInterface::abandon() const {
+    const_cast<GrGLInterface*>(this)->fFunctions = GrGLInterface::Functions();
+}
+
+#endif // GR_TEST_UTILS
diff --git a/tools/gpu/gl/interface/Makefile b/tools/gpu/gl/interface/Makefile
new file mode 100644
index 0000000..b7f5ced
--- /dev/null
+++ b/tools/gpu/gl/interface/Makefile
@@ -0,0 +1,5 @@
+generate:
+	go run *.go --in_table "./interface.json5" --out_dir "../../../../src/gpu/gl"
+
+dryrun:
+	go run *.go --in_table "./interface.json5" --out_dir "../../../../src/gpu/gl" --dryrun
\ No newline at end of file
diff --git a/tools/gpu/gl/interface/README.md b/tools/gpu/gl/interface/README.md
new file mode 100644
index 0000000..f4e1788
--- /dev/null
+++ b/tools/gpu/gl/interface/README.md
@@ -0,0 +1,22 @@
+GrGlInterface Autogeneration
+============================
+
+Background
+----------
+
+At a high level, the first three steps of making a GrGLInterface (a generic way to
+interact with a GL-like GPU) are:
+
+  - Assemble: Copy a set of function pointers into the struct
+  - Validate: Make sure the function pointers advertised actually exist.
+  - Capabilities: Compute what fast/slow paths are enabled based on the functions
+        in the struct (GrGLCaps, for short)
+
+Autogeneration
+--------------
+
+The first two steps have been automated with a table-based generation script located
+in this folder. The table is in JSON5 format (like JSON, but with comments). O
+
+Once edited, the Assemble/Validate code can be re-generated by running
+`make generate` in this folder.
\ No newline at end of file
diff --git a/tools/gpu/gl/interface/gen_interface.go b/tools/gpu/gl/interface/gen_interface.go
new file mode 100644
index 0000000..2edd531
--- /dev/null
+++ b/tools/gpu/gl/interface/gen_interface.go
@@ -0,0 +1,428 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package main
+
+// gen_interface creates the assemble/validate cpp files given the
+// interface.json5 file.
+// See README for more details.
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"github.com/flynn/json5"
+)
+
+var (
+	outDir  = flag.String("out_dir", "../../src/gpu/gl", "Where to output the GrGlAssembleInterface_* and GrGlInterface.cpp files")
+	inTable = flag.String("in_table", "./interface.json5", "The JSON5 table to read in")
+	dryRun  = flag.Bool("dryrun", false, "Print the outputs, don't write to file")
+)
+
+const (
+	CORE_FEATURE        = "<core>"
+	SPACER              = "    "
+	GLES_FILE_NAME      = "GrGLAssembleGLESInterfaceAutogen.cpp"
+	GL_FILE_NAME        = "GrGLAssembleGLInterfaceAutogen.cpp"
+	INTERFACE_FILE_NAME = "GrGLInterfaceAutogen.cpp"
+)
+
+// FeatureSet represents one set of requirements for each of the GL "standards" that
+// Skia supports.  This is currently OpenGL, OpenGL ES and WebGL.
+// OpenGL is typically abbreviated as just "GL".
+// https://www.khronos.org/registry/OpenGL/index_gl.php
+// https://www.khronos.org/opengles/
+// https://www.khronos.org/registry/webgl/specs/1.0/
+type FeatureSet struct {
+	GLReqs    []Requirement `json:"GL"`
+	GLESReqs  []Requirement `json:"GLES"`
+	WebGLReqs []Requirement `json:"WebGL"`
+
+	Functions         []string           `json:"functions"`
+	HardCodeFunctions []HardCodeFunction `json:"hardcode_functions"`
+	OptionalFunctions []string           `json:"optional"` // not checked in validate
+
+	Required bool `json:"required"`
+	EGLProc  bool `json:"egl_proc"`
+}
+
+// Requirement lists how we know if a function exists. Extension is the
+// GL extension (or the string CORE_FEATURE if it's part of the core functionality).
+// MinVersion optionally indicates the minimum version of a standard
+// that has the function.
+// SuffixOverride allows the extension suffix to be manually specified instead
+// of automatically derived from the extension name.
+// (for example, if an NV extension specifies some EXT extensions)
+type Requirement struct {
+	Extension      string     `json:"ext"` // required
+	MinVersion     *GLVersion `json:"min_version"`
+	SuffixOverride *string    `json:"suffix"`
+}
+
+// HardCodeFunction indicates to not use the C++ macro and just directly
+// adds a given function ptr to the struct.
+type HardCodeFunction struct {
+	PtrName  string `json:"ptr_name"`
+	CastName string `json:"cast_name"`
+	GetName  string `json:"get_name"`
+}
+
+var CORE_REQUIREMENT = Requirement{Extension: CORE_FEATURE, MinVersion: nil}
+
+type GLVersion [2]int
+
+// RequirementGetter functions allows us to "iterate" over the requirements
+// of the different standards which are stored as keys in FeatureSet and
+// normally not easily iterable.
+type RequirementGetter func(FeatureSet) []Requirement
+
+func glRequirements(fs FeatureSet) []Requirement {
+	return fs.GLReqs
+}
+
+func glesRequirements(fs FeatureSet) []Requirement {
+	return fs.GLESReqs
+}
+
+func webglRequirements(fs FeatureSet) []Requirement {
+	return fs.WebGLReqs
+}
+
+// generateAssembleInterface creates one GrGLAssembleInterface_[type]_gen.cpp
+// for each of the standards
+func generateAssembleInterface(features []FeatureSet) {
+	gl := fillAssembleTemplate(ASSEMBLE_INTERFACE_GL, features, glRequirements)
+	writeToFile(*outDir, GL_FILE_NAME, gl)
+	gles := fillAssembleTemplate(ASSEMBLE_INTERFACE_GL_ES, features, glesRequirements)
+	writeToFile(*outDir, GLES_FILE_NAME, gles)
+	// uncomment this when ready to implement WebGL
+	// webgl := fillAssembleTemplate(ASSEMBLE_INTERFACE_WEB_GL, features, webglRequirements)
+	// writeToFile(*outDir, "GrGLAssembleInterface_webgl_gen.cpp", webgl)
+}
+
+// fillAssembleTemplate returns a generated file given a template (for a single standard)
+// to fill out and a slice of features with which to fill it.  getReqs is used to select
+// the requirements for the standard we are working on.
+func fillAssembleTemplate(template string, features []FeatureSet, getReqs RequirementGetter) string {
+	content := ""
+	for _, feature := range features {
+		// For each feature set, we are going to create a series of
+		// if statements, which check for the requirements (e.g. extensions, version)
+		// and inside those if branches, write the code to load the
+		// correct function pointer to the interface. GET_PROC and
+		// GET_PROC_SUFFIX are macros defined in C++ part of the template
+		// to accomplish this (for a core feature and extensions, respectively).
+		reqs := getReqs(feature)
+		if len(reqs) == 0 {
+			continue
+		}
+		// blocks holds all the if blocks generated - it will be joined with else
+		// after and appended to content
+		blocks := []string{}
+		for i, req := range reqs {
+			block := ""
+			ifExpr := requirementIfExpression(req, true)
+
+			if ifExpr != "" {
+				if strings.HasPrefix(ifExpr, "(") {
+					ifExpr = "if " + ifExpr + " {"
+				} else {
+					ifExpr = "if (" + ifExpr + ") {"
+				}
+				// Indent the first if statement
+				if i == 0 {
+					block = addLine(block, ifExpr)
+				} else {
+					block += ifExpr + "\n"
+				}
+			}
+			// sort for determinism
+			sort.Strings(feature.Functions)
+			for _, function := range feature.Functions {
+				if ifExpr != "" {
+					// extra tab for being in an if statement
+					block += SPACER
+				}
+				suffix := deriveSuffix(req.Extension)
+				// Some ARB extensions don't have ARB suffixes because they were written
+				// for backwards compatibility simultaneous to adding them as required
+				// in a new GL version.
+				if suffix == "ARB" {
+					suffix = ""
+				}
+				if req.SuffixOverride != nil {
+					suffix = *req.SuffixOverride
+				}
+				if feature.EGLProc {
+					block = addLine(block, fmt.Sprintf("GET_EGL_PROC_SUFFIX(%s, %s);", function, suffix))
+				} else if req.Extension == CORE_FEATURE || suffix == "" {
+					block = addLine(block, fmt.Sprintf("GET_PROC(%s);", function))
+				} else if req.Extension != "" {
+					block = addLine(block, fmt.Sprintf("GET_PROC_SUFFIX(%s, %s);", function, suffix))
+				}
+			}
+			// a hard code function does not use the C++ macro
+			for _, hcf := range feature.HardCodeFunctions {
+				if ifExpr != "" {
+					// extra tab for being in an if statement
+					block += SPACER
+				}
+				line := fmt.Sprintf(`functions->%s =(%s*)get(ctx, "%s");`, hcf.PtrName, hcf.CastName, hcf.GetName)
+				block = addLine(block, line)
+			}
+			if ifExpr != "" {
+				block += SPACER + "}"
+			}
+			blocks = append(blocks, block)
+		}
+		content += strings.Join(blocks, " else ")
+
+		if feature.Required && reqs[0] != CORE_REQUIREMENT {
+			content += ` else {
+        SkASSERT(false); // Required feature
+        return nullptr;
+    }`
+		}
+
+		if !strings.HasSuffix(content, "\n") {
+			content += "\n"
+		}
+		// Add an extra space between blocks for easier readability
+		content += "\n"
+
+	}
+
+	return strings.Replace(template, "[[content]]", content, 1)
+}
+
+// requirementIfExpression returns a string that is an if expression
+// Notably, there is no if expression if the function is a "core" function
+// on all supported versions.
+// The expressions are wrapped in parentheses so they can be safely
+// joined together with && or ||.
+func requirementIfExpression(req Requirement, isLocal bool) string {
+	mv := req.MinVersion
+	if req == CORE_REQUIREMENT {
+		return ""
+	}
+	if req.Extension == CORE_FEATURE && mv != nil {
+		return fmt.Sprintf("(glVer >= GR_GL_VER(%d,%d))", mv[0], mv[1])
+	}
+	extVar := "fExtensions"
+	if isLocal {
+		extVar = "extensions"
+	}
+	// We know it has an extension
+	if req.Extension != "" {
+		if mv == nil {
+			return fmt.Sprintf("%s.has(%q)", extVar, req.Extension)
+		} else {
+			return fmt.Sprintf("(glVer >= GR_GL_VER(%d,%d) && %s.has(%q))", mv[0], mv[1], extVar, req.Extension)
+		}
+	}
+	abort("ERROR: requirement must have ext\n")
+	return "ERROR"
+}
+
+// driveSuffix returns the suffix of the function associated with the given
+// extension.
+func deriveSuffix(ext string) string {
+	// Some extensions begin with GL_ or EGL_ and then have the actual
+	// extension like KHR, EXT etc.
+	ext = strings.TrimPrefix(ext, "GL_")
+	ext = strings.TrimPrefix(ext, "EGL_")
+	return strings.Split(ext, "_")[0]
+}
+
+// addLine is a little helper function which handles the newline and tab
+func addLine(str, line string) string {
+	return str + SPACER + line + "\n"
+}
+
+func writeToFile(parent, file, content string) {
+	p := filepath.Join(parent, file)
+	if *dryRun {
+		fmt.Printf("Writing to %s\n", p)
+		fmt.Println(content)
+	} else {
+		if err := ioutil.WriteFile(p, []byte(content), 0644); err != nil {
+			abort("Error while writing to file %s: %s", p, err)
+		}
+	}
+}
+
+// validationEntry is a helper struct that contains anything
+// necessary to make validation code for a given standard.
+type validationEntry struct {
+	StandardCheck string
+	GetReqs       RequirementGetter
+}
+
+func generateValidateInterface(features []FeatureSet) {
+	standards := []validationEntry{
+		{
+			StandardCheck: "GR_IS_GR_GL(fStandard)",
+			GetReqs:       glRequirements,
+		}, {
+			StandardCheck: "GR_IS_GR_GL_ES(fStandard)",
+			GetReqs:       glesRequirements,
+		}, /*{ Disable until ready to add WebGL support
+			StandardCheck: "GR_IS_GR_WEB_GL(fStandard)",
+			GetReqs: webglRequirements
+		},*/
+	}
+	content := ""
+	// For each feature, we are going to generate a series of
+	// boolean expressions which check that the functions we thought
+	// were gathered during the assemble phase actually were applied to
+	// the interface (functionCheck). This check will be guarded
+	// another set of if statements (one per standard) based
+	// on the same requirements (standardChecks) that were used when
+	// assembling the interface.
+	for _, feature := range features {
+		if allReqsAreCore(feature) {
+			content += functionCheck(feature, 1)
+		} else {
+			content += SPACER
+			standardChecks := []string{}
+			for _, std := range standards {
+				reqs := std.GetReqs(feature)
+				if reqs == nil || len(reqs) == 0 {
+					continue
+				}
+				expr := []string{}
+				for _, r := range reqs {
+					e := requirementIfExpression(r, false)
+					if e != "" {
+						expr = append(expr, e)
+					}
+				}
+				check := ""
+				if len(expr) == 0 {
+					check = fmt.Sprintf("%s", std.StandardCheck)
+				} else {
+					lineBreak := "\n" + SPACER + "      "
+					check = fmt.Sprintf("(%s && (%s%s))", std.StandardCheck, lineBreak, strings.Join(expr, " ||"+lineBreak))
+				}
+				standardChecks = append(standardChecks, check)
+			}
+			content += fmt.Sprintf("if (%s) {\n", strings.Join(standardChecks, " ||\n"+SPACER+"   "))
+			content += functionCheck(feature, 2)
+
+			content += SPACER + "}\n"
+		}
+		// add additional line between each block
+		content += "\n"
+	}
+	content = strings.Replace(VALIDATE_INTERFACE, "[[content]]", content, 1)
+	writeToFile(*outDir, INTERFACE_FILE_NAME, content)
+}
+
+// functionCheck returns an if statement that checks that all functions
+// in the passed in slice are on the interface (that is, they are truthy
+// on the fFunctions struct)
+func functionCheck(feature FeatureSet, indentLevel int) string {
+	// sort for determinism
+	sort.Strings(feature.Functions)
+	indent := strings.Repeat(SPACER, indentLevel)
+
+	checks := []string{}
+	for _, function := range feature.Functions {
+		if in(function, feature.OptionalFunctions) {
+			continue
+		}
+		if feature.EGLProc {
+			checks = append(checks, "!fFunctions.fEGL"+function)
+		} else {
+			checks = append(checks, "!fFunctions.f"+function)
+		}
+
+	}
+	for _, hcf := range feature.HardCodeFunctions {
+		checks = append(checks, "!fFunctions."+hcf.PtrName)
+	}
+	if len(checks) == 0 {
+		return strings.Repeat(SPACER, indentLevel) + "// all functions were marked optional\n"
+	}
+
+	return fmt.Sprintf(`%sif (%s) {
+%s%sRETURN_FALSE_INTERFACE;
+%s}
+`, indent, strings.Join(checks, " ||\n"+indent+"    "), indent, SPACER, indent)
+}
+
+// allReqsAreCore returns true iff the FeatureSet is part of "core" for
+// all standards
+func allReqsAreCore(feature FeatureSet) bool {
+	if feature.GLReqs == nil || feature.GLESReqs == nil {
+		return false
+	}
+	return feature.GLReqs[0] == CORE_REQUIREMENT && feature.GLESReqs[0] == CORE_REQUIREMENT
+	// uncomment below when adding WebGL support
+	// && feature.WebGLReqs[0] == CORE_REQUIREMENT
+}
+
+func validateFeatures(features []FeatureSet) {
+	seen := map[string]bool{}
+	for _, feature := range features {
+		for _, fn := range feature.Functions {
+			if seen[fn] {
+				abort("ERROR: Duplicate function %s\n", fn)
+			}
+			seen[fn] = true
+		}
+	}
+}
+
+// in returns true if |s| is *in* |a| slice.
+func in(s string, a []string) bool {
+	for _, x := range a {
+		if x == s {
+			return true
+		}
+	}
+	return false
+}
+
+func abort(fmtStr string, inputs ...interface{}) {
+	fmt.Printf(fmtStr+"\n", inputs...)
+	os.Exit(1)
+}
+
+func main() {
+	flag.Parse()
+	b, err := ioutil.ReadFile(*inTable)
+	if err != nil {
+		abort("Could not read file %s", err)
+	}
+
+	dir, err := os.Open(*outDir)
+	if err != nil {
+		abort("Could not write to output dir %s", err)
+	}
+	defer dir.Close()
+	if fi, err := dir.Stat(); err != nil {
+		abort("Error getting info about %s: %s", *outDir, err)
+	} else if !fi.IsDir() {
+		abort("%s must be a directory", *outDir)
+	}
+
+	features := []FeatureSet{}
+
+	err = json5.Unmarshal(b, &features)
+	if err != nil {
+		abort("Invalid JSON: %s", err)
+	}
+
+	validateFeatures(features)
+
+	generateAssembleInterface(features)
+	generateValidateInterface(features)
+}
diff --git a/tools/gpu/gl/interface/interface.json5 b/tools/gpu/gl/interface/interface.json5
new file mode 100644
index 0000000..5ac4d74
--- /dev/null
+++ b/tools/gpu/gl/interface/interface.json5
@@ -0,0 +1,626 @@
+// This file specifies which functions should be attached to GrGLInterface
+// for a given standard (OpenGL, OpenGL ES, etc). It allows specifing
+// how and when to attach them (e.g. only if an extension is present).
+// It is used for both the assemble and validate step.
+//
+// Currently it assumes the minimum versions:
+//   - GL: 2.0
+//   - GLES: 2.0
+//   - WebGL: [WIP] 1.0
+//
+// http://web.eecs.umich.edu/~sugih/courses/eecs487/common/notes/APITables.xml
+// is a handy reference comparing GL and GLES API
+[
+  {
+    "GL":    [{"ext": "<core>"}],
+    "GLES":  [{"ext": "<core>"}],
+
+    "functions": [
+      "ActiveTexture", "AttachShader", "BindAttribLocation", "BindBuffer",
+      "BindTexture", "BlendColor", "BlendEquation", "BlendFunc",
+      "BufferData", "BufferSubData", "Clear", "ClearColor",
+      "ClearStencil", "ColorMask", "CompileShader", "CompressedTexImage2D",
+      "CompressedTexSubImage2D", "CopyTexSubImage2D", "CreateProgram", "CreateShader",
+      "CullFace", "DeleteBuffers", "DeleteProgram",
+      "DeleteShader", "DeleteTextures", "DepthMask", "Disable",
+      "DisableVertexAttribArray", "DrawArrays", "DrawElements", "Enable",
+      "EnableVertexAttribArray", "Finish", "Flush",
+      "FrontFace", "GenBuffers",
+      "GenTextures", "GetBufferParameteriv", "GetError",
+      "GetIntegerv", "GetProgramInfoLog",
+      "GetProgramiv", "GetShaderInfoLog",
+      "GetShaderiv", "GetString",
+      "GetUniformLocation", "IsTexture", "LineWidth", "LinkProgram", "PixelStorei",
+      "ReadPixels", "Scissor", "ShaderSource", "StencilFunc",
+      "StencilFuncSeparate", "StencilMask", "StencilMaskSeparate", "StencilOp",
+      "StencilOpSeparate", "TexImage2D", "TexParameterf", "TexParameterfv", "TexParameteri",
+      "TexParameteriv", "TexSubImage2D", "Uniform1f", "Uniform1fv", "Uniform1i", "Uniform1iv",
+      "Uniform2f", "Uniform2fv", "Uniform2i", "Uniform2iv", "Uniform3f", "Uniform3fv", "Uniform3i",
+      "Uniform3iv", "Uniform4f", "Uniform4fv", "Uniform4i", "Uniform4iv", "UniformMatrix2fv",
+      "UniformMatrix3fv", "UniformMatrix4fv", "UseProgram", "VertexAttrib1f",
+      "VertexAttrib2fv", "VertexAttrib3fv", "VertexAttrib4fv", "VertexAttribPointer",
+      "Viewport",
+    ],
+  },
+  { // GL exclusive core functions
+    "GL":    [{"ext": "<core>"}],
+    "GLES":  null,
+
+    "functions": [
+      "DrawBuffer", "PolygonMode",
+    ],
+  },
+  {
+    "GL":    [{"min_version": [3, 0], "ext": "<core>"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"}],
+
+    "functions": [
+      "GetStringi",
+    ]
+  },
+
+  {
+    "GL":    [{"ext": "<core>"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_OES_vertex_array_object"}],
+    "WebGL": [{"min_version": [2, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "OES_vertex_array_object"}],
+
+    // WebGL uses createVertexArray instead of genVertexArrays, but Emscripten
+    // creates an alias called genVertexArray which papers over this difference.
+    "functions": [
+      "BindVertexArray", "DeleteVertexArrays", "GenVertexArrays",
+    ],
+  },
+
+  {
+    "GL":    [{"min_version": [3, 0], "ext": "<core>"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "GL_EXT_blend_func_extended"}],
+
+    "functions": [
+      "BindFragDataLocation",
+    ],
+  },
+  {
+    "GL":    [{"min_version": [3, 3], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_blend_func_extended"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "GL_EXT_blend_func_extended"}],
+
+    "functions": [
+      "BindFragDataLocationIndexed",
+    ],
+  },
+
+  {
+    "GL":    [{"ext": "GL_KHR_blend_equation_advanced"},
+              {"ext": "GL_NV_blend_equation_advanced"}],
+    "GLES":  [{"ext": "GL_KHR_blend_equation_advanced"},
+              {"ext": "GL_NV_blend_equation_advanced"}],
+
+    "functions": [
+      "BlendBarrier",
+    ],
+  },
+
+  {
+    "GL":    [{"min_version": [4, 4], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_clear_texture"}],
+    "GLES":  [{"ext": "GL_EXT_clear_texture", "suffix": "EXT"}],
+
+    "functions": [
+      "ClearTexImage", "ClearTexSubImage",
+    ]
+  },
+
+  {
+    "GL":    [{"min_version": [3, 1], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_draw_instanced"},
+              {/*    else if      */  "ext": "GL_EXT_draw_instanced"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_EXT_draw_instanced"}],
+
+    "functions": [
+      "DrawArraysInstanced", "DrawElementsInstanced",
+    ]
+  },
+  { // ES 3.0 has glDrawBuffers but not glDrawBuffer
+    "GL":    [{"ext": "<core>"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"}],
+
+    "functions": [
+      "DrawBuffers", "ReadBuffer",
+    ]
+  },
+
+  {
+    "GL":    [{"min_version": [4, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_draw_indirect"}],
+    "GLES":  [{"min_version": [3, 1], "ext": "<core>"}],
+
+    "functions": [
+      "DrawArraysIndirect", "DrawElementsIndirect",
+    ]
+  },
+
+  { // glDrawRangeElements was added to ES in 3.0.
+    "GL":    [{"ext": "<core>"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"}],
+
+    "functions": [
+      "DrawRangeElements",
+    ]
+  },
+
+  {
+    "GL":    [{"min_version": [3, 2], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_texture_multisample"}],
+    "GLES":  [{"min_version": [3, 1], "ext": "<core>"}],
+
+    "functions": [
+      "GetMultisamplefv",
+    ]
+  },
+
+  // glGetTexLevelParameteriv was added to ES in 3.1.
+  {
+    "GL":    [{"ext": "<core>"}],
+    "GLES":  [{"min_version": [3, 1], "ext": "<core>"}],
+
+    "functions": [
+      "GetTexLevelParameteriv",
+    ]
+  },
+
+  {
+    "GL":    [{"min_version": [4, 3], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_multi_draw_indirect"}],
+    "GLES":  [{"ext": "GL_EXT_multi_draw_indirect"}],
+
+    "functions": [
+      "MultiDrawArraysIndirect", "MultiDrawElementsIndirect",
+    ]
+  },
+
+  {
+    "GL":    [{"min_version": [3, 1], "ext": "<core>"}],
+    "GLES":  [{"min_version": [3, 2], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_OES_texture_buffer"},
+              {/*    else if      */  "ext": "GL_EXT_texture_buffer"}],
+
+    "functions": [
+      "TexBuffer",
+    ]
+  },
+  {
+    "GL":    [{"min_version": [4, 3], "ext": "<core>"}],
+    "GLES":  [{"min_version": [3, 2], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_OES_texture_buffer"},
+              {/*    else if      */  "ext": "GL_EXT_texture_buffer"}],
+
+    "functions": [
+      "TexBufferRange",
+    ]
+  },
+
+    // GL_EXT_texture_storage is part of desktop 4.2
+    // There is a desktop ARB extension and an ES+desktop EXT extension
+  {
+    "GL":    [{"min_version": [4, 2], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_texture_storage"},
+              {/*    else if      */  "ext": "GL_EXT_texture_storage"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_EXT_texture_storage"}],
+
+    "functions": [
+      "TexStorage2D",
+    ]
+  },
+
+  // glTextureBarrier is part of desktop 4.5. There are also ARB and NV extensions.
+  {
+    "GL":    [{"min_version": [4, 5], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_texture_barrier"},
+              {/*    else if      */  "ext": "GL_NV_texture_barrier"}],
+    "GLES":  [{"ext": "GL_NV_texture_barrier"}],
+
+    "functions": [
+      "TextureBarrier",
+    ]
+  },
+
+  {
+    "GL":    null, // Not supported
+    "GLES":  [{"ext": "GL_EXT_discard_framebuffer"}],
+
+    "functions": [
+      "DiscardFramebuffer",
+    ]
+  },
+
+  {
+    "GL":    [{"min_version": [3, 2], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_instanced_arrays"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_EXT_instanced_arrays"}],
+
+    "functions": [
+      "VertexAttribDivisor",
+    ]
+  },
+  {
+    "GL":    [{"min_version": [3, 0], "ext": "<core>"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"}],
+
+    "functions": [
+      "VertexAttribIPointer",
+    ]
+  },
+
+  // FrameBuffer Object (FBO) related calls
+  {
+    "GL":    [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_framebuffer_object"},
+              {/*    else if      */  "ext": "GL_EXT_framebuffer_object"}],
+    "GLES":  [{"ext": "<core>"}], // These are all in ES 2.0 and above
+
+    "functions": [
+      "BindFramebuffer", "BindRenderbuffer", "CheckFramebufferStatus",
+      "DeleteFramebuffers", "DeleteRenderbuffers", "FramebufferRenderbuffer",
+      "FramebufferTexture2D", "GenFramebuffers", "GenRenderbuffers", "GenerateMipmap",
+      "GetFramebufferAttachmentParameteriv", "GetRenderbufferParameteriv",
+      "RenderbufferStorage",
+    ],
+  },
+  {
+    "GL":    [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_framebuffer_object"},
+              {/*    else if      */  "ext": "GL_EXT_framebuffer_blit"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_CHROMIUM_framebuffer_multisample"},
+              {/*    else if      */  "ext": "GL_ANGLE_framebuffer_blit"}],
+
+    "functions": [
+      "BlitFramebuffer",
+    ],
+  },
+  {
+    "GL":    [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_framebuffer_object"},
+              {/*    else if      */  "ext": "GL_EXT_framebuffer_multisample"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_CHROMIUM_framebuffer_multisample"},
+              {/*    else if      */  "ext": "GL_ANGLE_framebuffer_multisample"}],
+
+    "functions": [
+      "RenderbufferStorageMultisample",
+    ],
+  },
+
+  {
+    "GL":    null,
+    "GLES":  [{"ext": "GL_CHROMIUM_map_sub"}],
+
+    "functions": [
+      "MapBufferSubData", "MapTexSubImage2D", "UnmapBufferSubData",
+      "UnmapTexSubImage2D"
+    ],
+  },
+
+  {
+    "GL":    null,
+    "GLES":  [{"ext": "GL_EXT_multisampled_render_to_texture"},
+              {"ext": "GL_IMG_multisampled_render_to_texture"}],
+
+    "functions": [
+      "FramebufferTexture2DMultisample",
+    ],
+  },
+  {
+    "GL":    null,
+    "GLES":  [{"ext": "GL_EXT_multisampled_render_to_texture"}],
+
+    "hardcode_functions" : [
+      {
+        "ptr_name": "fRenderbufferStorageMultisampleES2EXT",
+        "cast_name": "GrGLRenderbufferStorageMultisampleFn",
+        "get_name": "glRenderbufferStorageMultisampleEXT",
+      }
+    ]
+  },
+  {
+    "GL":    null,
+    "GLES":  [{"ext": "GL_IMG_multisampled_render_to_texture"}],
+
+    "hardcode_functions" : [
+      {
+        "ptr_name": "fRenderbufferStorageMultisampleES2EXT",
+        "cast_name": "GrGLRenderbufferStorageMultisampleFn",
+        "get_name": "glRenderbufferStorageMultisampleIMG",
+      }
+    ]
+  },
+  {
+    "GL":    null,
+    "GLES":  [{"ext": "GL_APPLE_framebuffer_multisample"}],
+
+    "functions" : ["ResolveMultisampleFramebuffer"],
+    "hardcode_functions" : [
+      {
+        "ptr_name": "fRenderbufferStorageMultisampleES2APPLE",
+        "cast_name": "GrGLRenderbufferStorageMultisampleFn",
+        "get_name": "glRenderbufferStorageMultisampleAPPLE",
+      }
+    ]
+  },
+
+    // There are several APIs for buffer mapping:
+    // ES2 + GL_OES_mapbuffer: MapBufferOES and UnmapBufferOES
+    // ES2 + GL_EXT_map_buffer_range: Adds MapBufferRangeEXT and FlushMappedBufferRangeEXT
+    // ES3: MapBufferRange, FlushMappedBufferRange, and UnmapBuffer are core (so no suffix).
+    //
+    // MapBuffer is not part of ES3, but implementations may still report the OES versions of
+    // MapBuffer and UnmapBuffer, per the older GL_OES_mapbuffer extension. Some implementations
+    // let us mix the newer MapBufferRange with the older UnmapBufferOES, but we've hit others that
+    // don't permit it. Note that in GrGLBuffer, we choose which API to use based on version and
+    // extensions. This code is written so that we never mix OES and non-OES functions.
+  {
+    "GL":    [{"ext": "<core>"}],
+    "GLES":  [{"ext": "GL_OES_mapbuffer"}],
+
+    "functions": [
+      "MapBuffer",
+    ],
+  },
+  {
+    "GL":    [{"ext": "<core>"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_OES_mapbuffer"}],
+
+    "functions": [
+      "UnmapBuffer",
+    ],
+  },
+  {
+    "GL":    [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_map_buffer_range"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_EXT_map_buffer_range"}],
+
+    "functions": [
+      // These functions are added to the 3.0 version of both GLES and GL.
+      "MapBufferRange", "FlushMappedBufferRange",
+    ],
+  },
+
+  {
+    "GL":    [{"ext": "GL_EXT_debug_marker"}],
+    "GLES":  [{"ext": "GL_EXT_debug_marker"}],
+
+    "functions": [
+      "InsertEventMarker", "PushGroupMarker", "PopGroupMarker"
+    ],
+  },
+
+  {
+    "GL":    [{"min_version": [4, 3], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_program_interface_query"}],
+    "GLES":  [{"min_version": [3, 1], "ext": "<core>"}],
+
+    "functions": [
+      "GetProgramResourceLocation",
+    ],
+  },
+
+  {  // It appears that the GL_NV_path_rendering sometimes provides these
+     // functions under the "EXT" extension instead of "NV".
+    "GL":    [{"ext": "GL_NV_path_rendering", "suffix": "EXT"}],
+
+    "GLES":  [{"ext": "GL_CHROMIUM_path_rendering"},
+              {"ext": "GL_NV_path_rendering", "suffix": "EXT"}],
+
+    "functions": [
+      "MatrixLoadIdentity", "MatrixLoadf"
+    ],
+  },
+  {
+    "GL":    [{"ext": "GL_NV_path_rendering"}],
+    "GLES":  [{"ext": "GL_CHROMIUM_path_rendering"},
+              {"ext": "GL_NV_path_rendering"}],
+
+    "functions": [
+      "CoverFillPath", "CoverFillPathInstanced", "CoverStrokePath",
+      "CoverStrokePathInstanced", "DeletePaths", "GenPaths",
+      "IsPath", "PathCommands", "PathParameterf", "PathParameteri",
+      "PathStencilFunc", "ProgramPathFragmentInputGen", "StencilFillPath",
+      "StencilFillPathInstanced", "StencilStrokePath", "StencilStrokePathInstanced",
+      "StencilThenCoverFillPath", "StencilThenCoverFillPathInstanced",
+      "StencilThenCoverStrokePath", "StencilThenCoverStrokePathInstanced",
+    ],
+    // List of functions that Skia uses, but which have been added since the initial release
+    // of NV_path_rendering driver. We do not want to fail interface validation due to
+    // missing features, we will just not use the extension.
+    // If one updates this list, then update GrGLCaps::hasPathRenderingSupport too.
+    "optional": [
+      "ProgramPathFragmentInputGen", "StencilThenCoverFillPath",
+      "StencilThenCoverFillPathInstanced", "StencilThenCoverStrokePath",
+      "StencilThenCoverStrokePathInstanced",
+    ],
+  },
+  {
+    "GL":    null,
+    "GLES":  [{"ext": "GL_CHROMIUM_path_rendering"}],
+
+    "functions": [
+      "BindFragmentInputLocation",
+    ],
+  },
+  {
+    "GL":    [{"ext": "GL_NV_framebuffer_mixed_samples"}],
+    "GLES":  [{"ext": "GL_CHROMIUM_framebuffer_mixed_samples"},
+              {"ext": "GL_NV_framebuffer_mixed_samples"}],
+
+    "functions": [
+      "CoverageModulation",
+    ],
+  },
+
+  {
+    "GL":    [{"min_version": [4, 3], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_KHR_debug", "suffix": ""}],
+    "GLES":  [{"ext": "GL_KHR_debug"}],
+
+    // In OpenGL (but not ES), KHR_debug defines these methods to have no suffix.
+    "functions": [
+      "DebugMessageControl", "DebugMessageInsert", "DebugMessageCallback",
+      "GetDebugMessageLog", "PushDebugGroup", "PopDebugGroup", "ObjectLabel",
+    ],
+  },
+
+  {
+    "GL":    null,
+    "GLES":  [{"ext": "GL_CHROMIUM_bind_uniform_location"}],
+
+    "functions": [
+      "BindUniformLocation",
+    ],
+  },
+
+  {
+    "GL":    [{"ext": "GL_EXT_window_rectangles"}],
+    "GLES":  [{"ext": "GL_EXT_window_rectangles"}],
+
+    "functions": [
+      "WindowRectangles",
+    ],
+  },
+
+  {
+    "GL":    [{"ext": "EGL_KHR_image"},
+              {"ext": "EGL_KHR_image_base"}],
+    "GLES":  [{"ext": "EGL_KHR_image"},
+              {"ext": "EGL_KHR_image_base"}],
+
+    "functions": [
+      "CreateImage", "DestroyImage",
+    ],
+    "egl_proc": true
+  },
+
+  {
+    "GL":    [{"min_version": [3, 2], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_sync"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_APPLE_sync"}],
+
+    "functions": [
+      "ClientWaitSync", "DeleteSync", "FenceSync",
+      "IsSync", "WaitSync"
+    ],
+  },
+
+  {  // getInternalformativ was added in GL 4.2, ES 3.0, and with
+     // extension ARB_internalformat_query
+    "GL":    [{"min_version": [4, 2], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_internalformat_query"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"}],
+
+    "functions": [
+      "GetInternalformativ"
+    ],
+  },
+
+  {
+    "GL":    [{"min_version": [4, 1], "ext": "<core>"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"}],
+
+    "functions": [
+      "GetProgramBinary", "ProgramBinary", "ProgramParameteri",
+    ],
+  },
+
+  {
+    "GL":    [{"min_version": [3, 2], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_sampler_objects"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"}],
+
+    "functions": [
+      "BindSampler", "DeleteSamplers", "GenSamplers",
+      "SamplerParameteri", "SamplerParameteriv",
+    ],
+  },
+
+  {
+    "GL":    [{"ext": "<core>"}],
+    "GLES":  null, // not in ES
+
+    "functions": [
+      "GetQueryObjectiv",
+    ],
+  },
+  {
+    "GL":    [{"ext": "<core>"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_EXT_occlusion_query_boolean"}],
+
+    "functions": [
+      "GenQueries", "DeleteQueries", "BeginQuery", "EndQuery",
+      "GetQueryObjectuiv", "GetQueryiv",
+    ],
+
+    // Original comment says "Not yet added to chrome's bindings."
+    "optional": [
+      "GenQueries", "DeleteQueries", "BeginQuery", "EndQuery",
+      "GetQueryObjectuiv", "GetQueryiv",
+    ]
+  },
+  {
+    "GL":    [{"min_version": [3, 3], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_timer_query"},
+              {/*    else if      */  "ext": "GL_EXT_timer_query"}],
+    "GLES":  null,
+
+    "functions": [
+      "GetQueryObjecti64v", "GetQueryObjectui64v",
+    ],
+  },
+  {
+    "GL":    [{"min_version": [3, 3], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_timer_query"}],
+    "GLES":  null,
+
+    "functions": [
+      "QueryCounter",
+    ],
+  },
+
+  {
+    "GL":    [{"min_version": [4, 3], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_invalidate_subdata"}],
+    "GLES":  null,
+
+    "functions": [
+      "InvalidateBufferData", "InvalidateBufferSubData", "InvalidateTexImage",
+      "InvalidateTexSubImage",
+    ],
+  },
+  {  // ES 3.0 adds the framebuffer functions but not the others.
+    "GL":    [{"min_version": [4, 3], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_invalidate_subdata"}],
+    "GLES":  [{"min_version": [3, 0], "ext": "<core>"}],
+
+    "functions": [
+      "InvalidateFramebuffer", "InvalidateSubFramebuffer",
+    ],
+  },
+
+  {
+    "GL":    [{"min_version": [4, 3], "ext": "<core>"},
+              {/*    else if      */  "ext": "GL_ARB_ES2_compatibility"}],
+    "GLES":  [{"ext": "<core>"}],
+
+    "functions": [
+      "GetShaderPrecisionFormat",
+    ],
+  },
+
+]
\ No newline at end of file
diff --git a/tools/gpu/gl/interface/templates.go b/tools/gpu/gl/interface/templates.go
new file mode 100644
index 0000000..26dacbf
--- /dev/null
+++ b/tools/gpu/gl/interface/templates.go
@@ -0,0 +1,203 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package main
+
+const ASSEMBLE_INTERFACE_GL_ES = `/*
+ * Copyright 2019 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * THIS FILE IS AUTOGENERATED
+ * Make edits to tools/gpu/gl/interface/templates.go or they will
+ * be overwritten.
+ */
+
+#include "gl/GrGLAssembleInterface.h"
+#include "gl/GrGLAssembleHelpers.h"
+#include "gl/GrGLUtil.h"
+
+#define GET_PROC(F) functions->f##F = (GrGL##F##Fn*)get(ctx, "gl" #F)
+#define GET_PROC_SUFFIX(F, S) functions->f##F = (GrGL##F##Fn*)get(ctx, "gl" #F #S)
+#define GET_PROC_LOCAL(F) GrGL##F##Fn* F = (GrGL##F##Fn*)get(ctx, "gl" #F)
+
+#define GET_EGL_PROC_SUFFIX(F, S) functions->fEGL##F = (GrEGL##F##Fn*)get(ctx, "egl" #F #S)
+
+#if SK_DISABLE_GL_ES_INTERFACE
+sk_sp<const GrGLInterface> GrGLMakeAssembledGLESInterface(void *ctx, GrGLGetProc get) {
+    return nullptr;
+}
+#else
+sk_sp<const GrGLInterface> GrGLMakeAssembledGLESInterface(void *ctx, GrGLGetProc get) {
+    GET_PROC_LOCAL(GetString);
+    if (nullptr == GetString) {
+        return nullptr;
+    }
+
+    const char* verStr = reinterpret_cast<const char*>(GetString(GR_GL_VERSION));
+    GrGLVersion glVer = GrGLGetVersionFromString(verStr);
+
+    if (glVer < GR_GL_VER(2,0)) {
+        return nullptr;
+    }
+
+    GET_PROC_LOCAL(GetIntegerv);
+    GET_PROC_LOCAL(GetStringi);
+    GrEGLQueryStringFn* queryString;
+    GrEGLDisplay display;
+    GrGetEGLQueryAndDisplay(&queryString, &display, ctx, get);
+    GrGLExtensions extensions;
+    if (!extensions.init(kGLES_GrGLStandard, GetString, GetStringi, GetIntegerv, queryString,
+                         display)) {
+        return nullptr;
+    }
+
+    sk_sp<GrGLInterface> interface(new GrGLInterface);
+    GrGLInterface::Functions* functions = &interface->fFunctions;
+
+    // Autogenerated content follows
+[[content]]
+    // End autogenerated content
+    // TODO(kjlubick): Do we want a feature that removes the extension if it doesn't have
+    // the function? This is common on some low-end GPUs.
+
+    if (extensions.has("GL_KHR_debug")) {
+        // In general we have a policy against removing extension strings when the driver does
+        // not provide function pointers for an advertised extension. However, because there is a
+        // known device that advertises GL_KHR_debug but fails to provide the functions and this is
+        // a debugging- only extension we've made an exception. This also can happen when using
+        // APITRACE.
+        if (!interface->fFunctions.fDebugMessageControl) {
+            extensions.remove("GL_KHR_debug");
+        }
+    }
+    interface->fStandard = kGLES_GrGLStandard;
+    interface->fExtensions.swap(&extensions);
+
+    return std::move(interface);
+}
+#endif
+`
+
+const ASSEMBLE_INTERFACE_GL = `/*
+ * Copyright 2019 Google LLC
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * THIS FILE IS AUTOGENERATED
+ * Make edits to tools/gpu/gl/interface/templates.go or they will
+ * be overwritten.
+ */
+
+#include "gl/GrGLAssembleInterface.h"
+#include "gl/GrGLAssembleHelpers.h"
+#include "gl/GrGLUtil.h"
+
+#define GET_PROC(F) functions->f##F = (GrGL##F##Fn*)get(ctx, "gl" #F)
+#define GET_PROC_SUFFIX(F, S) functions->f##F = (GrGL##F##Fn*)get(ctx, "gl" #F #S)
+#define GET_PROC_LOCAL(F) GrGL##F##Fn* F = (GrGL##F##Fn*)get(ctx, "gl" #F)
+
+#define GET_EGL_PROC_SUFFIX(F, S) functions->fEGL##F = (GrEGL##F##Fn*)get(ctx, "egl" #F #S)
+
+#if SK_DISABLE_GL_INTERFACE
+sk_sp<const GrGLInterface> GrGLMakeAssembledGLInterface(void *ctx, GrGLGetProc get) {
+    return nullptr;
+}
+#else
+sk_sp<const GrGLInterface> GrGLMakeAssembledGLInterface(void *ctx, GrGLGetProc get) {
+    GET_PROC_LOCAL(GetString);
+    GET_PROC_LOCAL(GetStringi);
+    GET_PROC_LOCAL(GetIntegerv);
+
+    // GetStringi may be nullptr depending on the GL version.
+    if (nullptr == GetString || nullptr == GetIntegerv) {
+        return nullptr;
+    }
+
+    const char* versionString = (const char*) GetString(GR_GL_VERSION);
+    GrGLVersion glVer = GrGLGetVersionFromString(versionString);
+
+    if (glVer < GR_GL_VER(2,0) || GR_GL_INVALID_VER == glVer) {
+        // This is our minimum for non-ES GL.
+        return nullptr;
+    }
+
+    GrEGLQueryStringFn* queryString;
+    GrEGLDisplay display;
+    GrGetEGLQueryAndDisplay(&queryString, &display, ctx, get);
+    GrGLExtensions extensions;
+    if (!extensions.init(kGL_GrGLStandard, GetString, GetStringi, GetIntegerv, queryString,
+                         display)) {
+        return nullptr;
+    }
+
+    sk_sp<GrGLInterface> interface(new GrGLInterface());
+    GrGLInterface::Functions* functions = &interface->fFunctions;
+
+    // Autogenerated content follows
+[[content]]
+    // End autogenerated content
+    interface->fStandard = kGL_GrGLStandard;
+    interface->fExtensions.swap(&extensions);
+
+    return std::move(interface);
+}
+#endif
+`
+
+const VALIDATE_INTERFACE = `/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * THIS FILE IS AUTOGENERATED
+ * Make edits to tools/gpu/gl/interface/templates.go or they will
+ * be overwritten.
+ */
+
+#include "gl/GrGLInterface.h"
+#include "gl/GrGLExtensions.h"
+#include "gl/GrGLUtil.h"
+
+#include <stdio.h>
+
+GrGLInterface::GrGLInterface() {
+    fStandard = kNone_GrGLStandard;
+}
+
+#define RETURN_FALSE_INTERFACE                                                 \
+    SkDEBUGF("%s:%d GrGLInterface::validate() failed.\n", __FILE__, __LINE__); \
+    return false
+
+bool GrGLInterface::validate() const {
+
+    if (kNone_GrGLStandard == fStandard) {
+        RETURN_FALSE_INTERFACE;
+    }
+
+    if (!fExtensions.isInitialized()) {
+        RETURN_FALSE_INTERFACE;
+    }
+
+    GrGLVersion glVer = GrGLGetVersion(this);
+    if (GR_GL_INVALID_VER == glVer) {
+        RETURN_FALSE_INTERFACE;
+    }
+    // Autogenerated content follows
+[[content]]
+    // End autogenerated content
+    return true;
+}
+
+#if GR_TEST_UTILS
+
+void GrGLInterface::abandon() const {
+    const_cast<GrGLInterface*>(this)->fFunctions = GrGLInterface::Functions();
+}
+
+#endif // GR_TEST_UTILS
+`