Use C OpenGL interface in mojo::GLContext

mojo/public/platform/native/gles2_impl_chromium_map_sub_thunks.h

+// Copyright 2015 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.
+
+#ifndef MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_IMPL_CHROMIUM_MAP_SUB_THUNKS_H_
+#define MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_IMPL_CHROMIUM_MAP_SUB_THUNKS_H_
+
+#include <stddef.h>
+
+#include "mojo/public/c/gles2/chromium_map_sub.h"
+
+// Specifies the frozen API for the GLES2 CHROMIUM_map_sub extension.
+#pragma pack(push, 8)
+struct MojoGLES2ImplChromiumMapSubThunks {
+  size_t size;  // Should be set to sizeof(*this).
+
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+  ReturnType(GL_APIENTRY* Function) PARAMETERS;
+#include "mojo/public/c/gles2/gles2_call_visitor_chromium_map_sub_autogen.h"
+#undef VISIT_GL_CALL
+};
+#pragma pack(pop)
+
+// Intended to be called from the embedder to get the embedder's implementation
+// of GLES2.
+inline MojoGLES2ImplChromiumMapSubThunks
+MojoMakeGLES2ImplChromiumMapSubThunks() {
+  MojoGLES2ImplChromiumMapSubThunks gles2_impl_chromium_map_sub_thunks = {
+      sizeof(MojoGLES2ImplChromiumMapSubThunks),
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) gl##Function,
+#include "mojo/public/c/gles2/gles2_call_visitor_chromium_map_sub_autogen.h"
+#undef VISIT_GL_CALL
+  };
+
+  return gles2_impl_chromium_map_sub_thunks;
+}
+
+// Use this type for the function found by dynamically discovering it in
+// a DSO linked with mojo_system.
+// The contents of |gles2_impl_chromium_map_sub_thunks| are copied.
+typedef size_t (*MojoSetGLES2ImplChromiumMapSubThunksFn)(
+    const MojoGLES2ImplChromiumMapSubThunks* thunks);
+
+#endif  // MOJO_PUBLIC_PLATFORM_NATIVE_GLES2_IMPL_CHROMIUM_MAP_SUB_THUNKS_H_