mojo/public/platform/native/mgl_signal_sync_point_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_MGL_SIGNAL_SYNC_POINT_THUNKS_H_
#define MOJO_PUBLIC_PLATFORM_NATIVE_MGL_SIGNAL_SYNC_POINT_THUNKS_H_

#include <stddef.h>

#include "mojo/public/c/gpu/MGL/mgl_signal_sync_point.h"

// Structure used to bind the MGL signal sync point interface DSO to those
// of the embedder.
//
// This is the ABI between the embedder and the DSO. It can only have new
// functions added to the end. No other changes are supported.
#pragma pack(push, 8)
struct MGLSignalSyncPointThunks {
  size_t size;  // Should be set to sizeof(MGLSignalSyncPointThunks).

  void (*MGLSignalSyncPoint)(uint32_t sync_point,
                             MGLSignalSyncPointCallback callback,
                             void* lost_callback_closure);
};
#pragma pack(pop)

#ifdef __cplusplus
// Intended to be called from the embedder. Returns an object initialized to
// contain pointers to each of the embedder's MGLSignalSyncPointThunks
// functions.
inline struct MGLSignalSyncPointThunks MojoMakeMGLSignalSyncPointThunks() {
  struct MGLSignalSyncPointThunks mgl_thunks = {
      sizeof(struct MGLSignalSyncPointThunks), MGLSignalSyncPoint,
  };

  return mgl_thunks;
}
#endif  // __cplusplus

// Use this type for the function found by dynamically discovering it in
// a DSO linked with mojo_system. For example:
// MojoSetMGLSignalSyncPointThunksFn mojo_set_gles2_thunks_fn =
//     reinterpret_cast<MojoSetMGLSignalSyncPointThunksFn>(
//         app_library.GetFunctionPointer("MojoSetMGLSignalSyncPointThunks"));
// The expected size of |mgl_thunks| is returned.
// The contents of |mgl_thunks| are copied.
typedef size_t (*MojoSetMGLSignalSyncPointThunksFn)(
    const struct MGLSignalSyncPointThunks* mgl_signal_sync_point_thunks);

#endif  // MOJO_PUBLIC_PLATFORM_NATIVE_MGL_SIGNAL_SYNC_POINT_THUNKS_H_