mutter/cogl/cogl/cogl-fence.h

/*
 * Cogl
 *
 * A Low Level GPU Graphics and Utilities API
 *
 * Copyright (C) 2012 Collabora Ltd.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 *
 */

#pragma once

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

#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.
 */
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.
 */
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.
 */
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.
 */
COGL_EXPORT 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.
 */
COGL_EXPORT 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.
 */
COGL_EXPORT void
cogl_framebuffer_cancel_fence_callback (CoglFramebuffer *framebuffer,
                                        CoglFenceClosure *closure);