/*
 * Cogl
 *
 * An object oriented GL/GLES Abstraction/Utility Layer
 *
 * Copyright (C) 2012 Collabora Ltd.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library. If not, see <http://www.gnu.org/licenses/>.
 *
 *
 */

#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
#error "Only <cogl/cogl.h> can be included directly."
#endif

#ifndef __COGL_FENCE_H__
#define __COGL_FENCE_H__

#include <cogl/cogl-types.h>
#include <cogl/cogl-framebuffer.h>

/**
 * SECTION:cogl-fence
 * @short_description: Functions for notification of command completion
 *
 * Cogl allows notification of GPU command completion; users may mark
 * points in the GPU command stream and receive notification when the GPU
 * has executed to that point.
 */

/**
 * CoglFence:
 *
 * An opaque object representing a fence. This type is currently
 * unused but in the future may be used to pass extra information
 * about the fence completion.
 *
 * Since: 2.0
 * Stability: Unstable
 */
typedef struct _CoglFence CoglFence;

/**
 * CoglFenceCallback:
 * @fence: Unused. In the future this parameter may be used to pass
 *   extra information about the fence completion but for now it
 *   should be ignored.
 * @user_data: The private data passed to cogl_framebuffer_add_fence_callback()
 *
 * The callback prototype used with
 * cogl_framebuffer_add_fence_callback() for notification of GPU
 * command completion.
 *
 * Since: 2.0
 * Stability: Unstable
 */
typedef void (* CoglFenceCallback) (CoglFence *fence,
                                    void *user_data);

/**
 * CoglFenceClosure:
 *
 * An opaque type representing one future callback to be made when the
 * GPU command stream has passed a certain point.
 *
 * Since: 2.0
 * Stability: Unstable
 */
typedef struct _CoglFenceClosure CoglFenceClosure;

/**
 * cogl_frame_closure_get_user_data:
 * @closure: A #CoglFenceClosure returned from cogl_framebuffer_add_fence()
 *
 * Returns the user_data submitted to cogl_framebuffer_add_fence() which
 * returned a given #CoglFenceClosure.
 *
 * Since: 2.0
 * Stability: Unstable
 */
void *
cogl_fence_closure_get_user_data (CoglFenceClosure *closure);

/**
 * cogl_framebuffer_add_fence_callback:
 * @framebuffer: The #CoglFramebuffer the commands have been submitted to
 * @callback: (scope notified): A #CoglFenceCallback to be called when
 *            all commands submitted to Cogl have been executed
 * @user_data: (closure): Private data that will be passed to the callback
 *
 * Calls the provided callback when all previously-submitted commands have
 * been executed by the GPU.
 *
 * Returns non-NULL if the fence succeeded, or %NULL if it was unable to
 * be inserted and the callback will never be called.  The user does not
 * need to free the closure; it will be freed automatically when the
 * callback is called, or cancelled.
 *
 * Since: 2.0
 * Stability: Unstable
 */
CoglFenceClosure *
cogl_framebuffer_add_fence_callback (CoglFramebuffer *framebuffer,
                                     CoglFenceCallback callback,
                                     void *user_data);

/**
 * cogl_framebuffer_cancel_fence_callback:
 * @framebuffer: The #CoglFramebuffer the commands were submitted to
 * @closure: The #CoglFenceClosure returned from
 *           cogl_framebuffer_add_fence_callback()
 *
 * Removes a fence previously submitted with
 * cogl_framebuffer_add_fence_callback(); the callback will not be
 * called.
 *
 * Since: 2.0
 * Stability: Unstable
 */
void
cogl_framebuffer_cancel_fence_callback (CoglFramebuffer *framebuffer,
                                        CoglFenceClosure *closure);

#endif /* __COGL_FENCE_H__ */
