mojo: Convert gles2 to the new thunking system

mojo/public/platform/native/gles2_thunks.cc

+// Copyright 2014 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.
+
+#include "mojo/public/platform/native/gles2_thunks.h"
+
+#include <assert.h>
+
+extern "C" {
+
+static MojoGLES2ControlThunks g_control_thunks = {0};
+static MojoGLES2ImplThunks g_impl_thunks = {0};
+
+void MojoGLES2Initialize(const MojoAsyncWaiter* async_waiter) {
+  assert(g_control_thunks.GLES2Initialize);
+  g_control_thunks.GLES2Initialize(async_waiter);
+}
+
+void MojoGLES2Terminate() {
+  assert(g_control_thunks.GLES2Terminate);
+  g_control_thunks.GLES2Terminate();
+}
+
+MojoGLES2Context MojoGLES2CreateContext(
+    MojoHandle handle,
+    MojoGLES2ContextLost lost_callback,
+    void* closure) {
+  assert(g_control_thunks.GLES2CreateContext);
+  return g_control_thunks.GLES2CreateContext(handle, lost_callback, closure);
+}
+
+void MojoGLES2DestroyContext(MojoGLES2Context context) {
+  assert(g_control_thunks.GLES2DestroyContext);
+  g_control_thunks.GLES2DestroyContext(context);
+}
+
+void MojoGLES2MakeCurrent(MojoGLES2Context context) {
+  assert(g_control_thunks.GLES2MakeCurrent);
+  g_control_thunks.GLES2MakeCurrent(context);
+}
+
+void MojoGLES2SwapBuffers() {
+  assert(g_control_thunks.GLES2SwapBuffers);
+  g_control_thunks.GLES2SwapBuffers();
+}
+
+void* MojoGLES2GetGLES2Interface(MojoGLES2Context context) {
+  assert(g_control_thunks.GLES2GetGLES2Interface);
+  return g_control_thunks.GLES2GetGLES2Interface(context);
+}
+
+void* MojoGLES2GetContextSupport(MojoGLES2Context context) {
+  assert(g_control_thunks.GLES2GetContextSupport);
+  return g_control_thunks.GLES2GetContextSupport(context);
+}
+
+#define VISIT_GL_CALL(Function, ReturnType, PARAMETERS, ARGUMENTS) \
+  ReturnType gl##Function PARAMETERS {                             \
+    assert(g_impl_thunks.Function);                                \
+    return g_impl_thunks.Function ARGUMENTS;                       \
+  }
+#include "mojo/public/c/gles2/gles2_call_visitor_autogen.h"
+#undef VISIT_GL_CALL
+
+// Call this function by looking

[viettrungluu, 2014/07/29 00:27:06]

If only I knew what this comment (which you copied from an existing file) was
meant to say.

+// Always export this api.
+#if defined(WIN32)
+#define THUNK_EXPORT __declspec(dllexport)

[viettrungluu, 2014/07/29 00:27:06]

Could you factor THUNK_EXPORT out into a header file
(.../platform/native/thunk_export.h?).

+#else
+#define THUNK_EXPORT __attribute__((visibility("default")))
+#endif
+
+extern "C" THUNK_EXPORT size_t MojoSetGLES2ControlThunks(
+    const MojoGLES2ControlThunks* gles2_control_thunks) {
+  if (gles2_control_thunks->size >= sizeof(g_control_thunks)) {

[viettrungluu, 2014/07/29 00:27:06]

nit (here and below): Mostly, we omit the braces when the block is a single
line.

+    g_control_thunks = *gles2_control_thunks;
+  }
+  return sizeof(g_control_thunks);
+}
+
+extern "C" THUNK_EXPORT size_t MojoSetGLES2ImplThunks(
+    const MojoGLES2ImplThunks* gles2_impl_thunks) {
+  if (gles2_impl_thunks->size >= sizeof(g_impl_thunks)) {
+    g_impl_thunks = *gles2_impl_thunks;
+  }
+  return sizeof(g_impl_thunks);
+}
+
+}  // extern "C"