mirror of
https://github.com/brl/mutter.git
synced 2024-11-09 23:46:33 -05:00
ed90c6fed9
This updates the cogl_poll_ apis to allow dispatching events before we have a CoglContext and to also enables pollfd state to be changed in a more add-hoc way by different Cogl components by replacing the winsys->get_poll_info with _cogl_poll_renderer_add/remove_fd functions and a winsys->get_dispatch_timeout vfunc. One of the intentions here is that applications should be able to run their mainloop before creating a CoglContext to potentially get events relating to CoglOutputs. Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit 667e58c9cb2662aef5f44e580a9eda42dc8d0176)
195 lines
7.1 KiB
C
195 lines
7.1 KiB
C
/*
|
|
* Cogl
|
|
*
|
|
* An object oriented GL/GLES Abstraction/Utility Layer
|
|
*
|
|
* Copyright (C) 2012 Intel Corporation.
|
|
*
|
|
* 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/>.
|
|
*
|
|
*
|
|
* 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__ */
|