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/*
* Cogl
*
* A Low Level GPU Graphics and Utilities API
*
* Copyright (C) 2012 Intel Corporation.
*
* 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.
*
*
* Authors:
* Neil Roberts <neil@linux.intel.com>
*/
#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
#error "Only <cogl/cogl.h> can be included directly."
#endif
#ifndef __COGL_POLL_H__
#define __COGL_POLL_H__
#include <cogl/cogl-defines.h>
#include <cogl/cogl-context.h>
COGL_BEGIN_DECLS
/**
* SECTION:cogl-poll
* @short_description: Functions for integrating Cogl with an
* application's main loop
*
* Cogl needs to integrate with the application's main loop so that it
* can internally handle some events from the driver. All Cogl
* applications must use these functions. They provide enough
* information to describe the state that Cogl will need to wake up
* on. An application using the GLib main loop can instead use
* cogl_glib_source_new() which provides a #GSource ready to be added
* to the main loop.
*/
/**
* CoglPollFDEvent:
* @COGL_POLL_FD_EVENT_IN: there is data to read
* @COGL_POLL_FD_EVENT_PRI: data can be written (without blocking)
* @COGL_POLL_FD_EVENT_OUT: there is urgent data to read.
* @COGL_POLL_FD_EVENT_ERR: error condition
* @COGL_POLL_FD_EVENT_HUP: hung up (the connection has been broken, usually
* for pipes and sockets).
* @COGL_POLL_FD_EVENT_NVAL: invalid request. The file descriptor is not open.
*
* A bitmask of events that Cogl may need to wake on for a file
* descriptor. Note that these all have the same values as the
* corresponding defines for the poll function call on Unix so they
* may be directly passed to poll.
*
* Since: 1.10
* Stability: unstable
*/
typedef enum
{
COGL_POLL_FD_EVENT_IN = COGL_SYSDEF_POLLIN,
COGL_POLL_FD_EVENT_PRI = COGL_SYSDEF_POLLPRI,
COGL_POLL_FD_EVENT_OUT = COGL_SYSDEF_POLLOUT,
COGL_POLL_FD_EVENT_ERR = COGL_SYSDEF_POLLERR,
COGL_POLL_FD_EVENT_HUP = COGL_SYSDEF_POLLHUP,
COGL_POLL_FD_EVENT_NVAL = COGL_SYSDEF_POLLNVAL
} CoglPollFDEvent;
/**
* CoglPollFD:
* @fd: The file descriptor to block on
* @events: A bitmask of events to block on
* @revents: A bitmask of returned events
*
* A struct for describing the state of a file descriptor that Cogl
* needs to block on. The @events field contains a bitmask of
* #CoglPollFDEvent<!-- -->s that should cause the application to wake
* up. After the application is woken up from idle it should pass back
* an array of #CoglPollFD<!-- -->s to Cogl and update the @revents
* mask to the actual events that occurred on the file descriptor.
*
* Note that CoglPollFD is deliberately exactly the same as struct
* pollfd on Unix so that it can simply be cast when calling poll.
*
* Since: 1.10
* Stability: unstable
*/
typedef struct {
int fd;
short int events;
short int revents;
} CoglPollFD;
/**
* cogl_poll_renderer_get_info:
* @renderer: A #CoglRenderer
* @poll_fds: A return location for a pointer to an array
* of #CoglPollFD<!-- -->s
* @n_poll_fds: A return location for the number of entries in *@poll_fds
* @timeout: A return location for the maximum length of time to wait
* in microseconds, or -1 to wait indefinitely.
*
* Is used to integrate Cogl with an application mainloop that is based
* on the unix poll(2) api (or select() or something equivalent). This
* api should be called whenever an application is about to go idle so
* that Cogl has a chance to describe what file descriptor events it
* needs to be woken up for.
*
* <note>If your application is using the Glib mainloop then you
* should jump to the cogl_glib_source_new() api as a more convenient
* way of integrating Cogl with the mainloop.</note>
*
* After the function is called *@poll_fds will contain a pointer to
* an array of #CoglPollFD structs describing the file descriptors
* that Cogl expects. The fd and events members will be updated
* accordingly. After the application has completed its idle it is
* expected to either update the revents members directly in this
* array or to create a copy of the array and update them
* there.
*
* When the application mainloop returns from calling poll(2) (or its
* equivalent) then it should call cogl_poll_renderer_dispatch()
* passing a pointer the array of CoglPollFD<!-- -->s with updated
* revent values.
*
* When using the %COGL_WINSYS_ID_WGL winsys (where file descriptors
* don't make any sense) or %COGL_WINSYS_ID_SDL (where the event
* handling functions of SDL don't allow blocking on a file
* descriptor) *n_poll_fds is guaranteed to be zero.
*
* @timeout will contain a maximum amount of time to wait in
* microseconds before the application should wake up or -1 if the
* application should wait indefinitely. This can also be 0 if
* Cogl needs to be woken up immediately.
*
* Return value: A "poll fd state age" that changes whenever the set
* of poll_fds has changed. If this API is being used to
* integrate with another system mainloop api then
* knowing if the set of file descriptors and events has
* really changed can help avoid redundant work
* depending the api. The age isn't guaranteed to change
* when the timeout changes.
*
* Stability: unstable
* Since: 1.16
*/
int
cogl_poll_renderer_get_info (CoglRenderer *renderer,
CoglPollFD **poll_fds,
int *n_poll_fds,
int64_t *timeout);
/**
* cogl_poll_renderer_dispatch:
* @renderer: A #CoglRenderer
* @poll_fds: An array of #CoglPollFD<!-- -->s describing the events
* that have occurred since the application went idle.
* @n_poll_fds: The length of the @poll_fds array.
*
* This should be called whenever an application is woken up from
* going idle in its main loop. The @poll_fds array should contain a
* list of file descriptors matched with the events that occurred in
* revents. The events field is ignored. It is safe to pass in extra
* file descriptors that Cogl didn't request when calling
* cogl_poll_renderer_get_info() or a shorter array missing some file
* descriptors that Cogl requested.
*
* <note>If your application didn't originally create a #CoglRenderer
* manually then you can easily get a #CoglRenderer pointer by calling
* cogl_get_renderer().</note>
*
* Stability: unstable
* Since: 1.16
*/
void
cogl_poll_renderer_dispatch (CoglRenderer *renderer,
const CoglPollFD *poll_fds,
int n_poll_fds);
COGL_END_DECLS
#endif /* __COGL_POLL_H__ */
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