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mutter/cogl/cogl/cogl-onscreen.h

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/*
* Cogl
*
* A Low Level GPU Graphics and Utilities API
*
* Copyright (C) 2011,2012,2013 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:
* Robert Bragg <robert@linux.intel.com>
*/
#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
#error "Only <cogl/cogl.h> can be included directly."
#endif
#ifndef __COGL_ONSCREEN_H
#define __COGL_ONSCREEN_H
#include <cogl/cogl-context.h>
#include <cogl/cogl-framebuffer.h>
#include <cogl/cogl-frame-info.h>
#include <cogl/cogl-object.h>
#include <glib-object.h>
G_BEGIN_DECLS
typedef struct _CoglScanout CoglScanout;
#define COGL_TYPE_ONSCREEN (cogl_onscreen_get_type ())
COGL_EXPORT
G_DECLARE_DERIVABLE_TYPE (CoglOnscreen, cogl_onscreen,
COGL, ONSCREEN,
CoglFramebuffer)
struct _CoglOnscreenClass
{
/*< private >*/
CoglFramebufferClass parent_class;
void (* bind) (CoglOnscreen *onscreen);
void (* swap_buffers_with_damage) (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles,
CoglFrameInfo *info,
gpointer user_data);
void (* swap_region) (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles,
CoglFrameInfo *info,
gpointer user_data);
gboolean (* direct_scanout) (CoglOnscreen *onscreen,
CoglScanout *scanout,
CoglFrameInfo *info,
gpointer user_data,
GError **error);
int (* get_buffer_age) (CoglOnscreen *onscreen);
};
#define COGL_SCANOUT_ERROR (cogl_scanout_error_quark ())
COGL_EXPORT GQuark
cogl_scanout_error_quark (void);
typedef enum _CoglScanoutError
{
COGL_SCANOUT_ERROR_INHIBITED,
} CoglScanoutError;
/**
* cogl_onscreen_show:
* @onscreen: The onscreen framebuffer to make visible
*
* This requests to make @onscreen visible to the user.
*
* Actually the precise semantics of this function depend on the
* window system currently in use, and if you don't have a
* multi-windowining system this function may in-fact do nothing.
*
* This function will implicitly allocate the given @onscreen
* framebuffer before showing it if it hasn't already been allocated.
*
* When using the Wayland winsys calling this will set the surface to
* a toplevel type which will make it appear. If the application wants
* to set a different type for the surface, it can avoid calling
* cogl_onscreen_show() and set its own type directly with the Wayland
* client API via cogl_wayland_onscreen_get_surface().
*
* <note>Since Cogl doesn't explicitly track the visibility status of
* onscreen framebuffers it won't try to avoid redundant window system
* requests e.g. to show an already visible window. This also means
* that it's acceptable to alternatively use native APIs to show and
* hide windows without confusing Cogl.</note>
*
* Since: 2.0
* Stability: Unstable
*/
COGL_EXPORT void
cogl_onscreen_show (CoglOnscreen *onscreen);
/**
* cogl_onscreen_hide:
* @onscreen: The onscreen framebuffer to make invisible
*
* This requests to make @onscreen invisible to the user.
*
* Actually the precise semantics of this function depend on the
* window system currently in use, and if you don't have a
* multi-windowining system this function may in-fact do nothing.
*
* This function does not implicitly allocate the given @onscreen
* framebuffer before hiding it.
*
* <note>Since Cogl doesn't explicitly track the visibility status of
* onscreen framebuffers it won't try to avoid redundant window system
* requests e.g. to show an already visible window. This also means
* that it's acceptable to alternatively use native APIs to show and
* hide windows without confusing Cogl.</note>
*
* Since: 2.0
* Stability: Unstable
*/
COGL_EXPORT void
cogl_onscreen_hide (CoglOnscreen *onscreen);
/**
* cogl_onscreen_swap_buffers:
* @onscreen: A #CoglOnscreen framebuffer
*
* Swaps the current back buffer being rendered too, to the front for display.
*
* This function also implicitly discards the contents of the color, depth and
* stencil buffers as if cogl_framebuffer_discard_buffers() were used. The
* significance of the discard is that you should not expect to be able to
* start a new frame that incrementally builds on the contents of the previous
* frame.
*
* <note>It is highly recommended that applications use
* cogl_onscreen_swap_buffers_with_damage() instead whenever possible
* and also use the cogl_onscreen_get_buffer_age() api so they can
* perform incremental updates to older buffers instead of having to
* render a full buffer for every frame.</note>
*
* Since: 1.10
* Stability: unstable
*/
COGL_EXPORT void
cogl_onscreen_swap_buffers (CoglOnscreen *onscreen,
CoglFrameInfo *frame_info,
gpointer user_data);
/**
* cogl_onscreen_get_buffer_age:
* @onscreen: A #CoglOnscreen framebuffer
*
* Gets the current age of the buffer contents.
*
* This function allows applications to query the age of the current
* back buffer contents for a #CoglOnscreen as the number of frames
* elapsed since the contents were most recently defined.
*
* These age values exposes enough information to applications about
* how Cogl internally manages back buffers to allow applications to
* re-use the contents of old frames and minimize how much must be
* redrawn for the next frame.
*
* The back buffer contents can either be reported as invalid (has an
* age of 0) or it may be reported to be the same contents as from n
* frames prior to the current frame.
*
* The queried value remains valid until the next buffer swap.
*
* <note>One caveat is that under X11 the buffer age does not reflect
* changes to buffer contents caused by the window systems. X11
* applications must track Expose events to determine what buffer
* regions need to additionally be repaired each frame.</note>
*
* The recommended way to take advantage of this buffer age api is to
* build up a circular buffer of length 3 for tracking damage regions
* over the last 3 frames and when starting a new frame look at the
* age of the buffer and combine the damage regions for the current
* frame with the damage regions of previous @age frames so you know
* everything that must be redrawn to update the old contents for the
* new frame.
*
* <note>If the system doesn't not support being able to track the age
* of back buffers then this function will always return 0 which
* implies that the contents are undefined.</note>
*
* <note>The %COGL_FEATURE_ID_BUFFER_AGE feature can optionally be
* explicitly checked to determine if Cogl is currently tracking the
* age of #CoglOnscreen back buffer contents. If this feature is
* missing then this function will always return 0.</note>
*
* Return value: The age of the buffer contents or 0 when the buffer
* contents are undefined.
*
* Since: 1.14
* Stability: stable
*/
COGL_EXPORT int
cogl_onscreen_get_buffer_age (CoglOnscreen *onscreen);
/**
* cogl_onscreen_swap_buffers_with_damage:
* @onscreen: A #CoglOnscreen framebuffer
* @rectangles: An array of integer 4-tuples representing damaged
* rectangles as (x, y, width, height) tuples.
* @n_rectangles: The number of 4-tuples to be read from @rectangles
*
* Swaps the current back buffer being rendered too, to the front for
* display and provides information to any system compositor about
* what regions of the buffer have changed (damage) with respect to
* the last swapped buffer.
*
* This function has the same semantics as
* cogl_framebuffer_swap_buffers() except that it additionally allows
* applications to pass a list of damaged rectangles which may be
* passed on to a compositor so that it can minimize how much of the
* screen is redrawn in response to this applications newly swapped
* front buffer.
*
* For example if your application is only animating a small object in
* the corner of the screen and everything else is remaining static
* then it can help the compositor to know that only the bottom right
* corner of your newly swapped buffer has really changed with respect
* to your previously swapped front buffer.
*
* If @n_rectangles is 0 then the whole buffer will implicitly be
* reported as damaged as if cogl_onscreen_swap_buffers() had been
* called.
*
* This function also implicitly discards the contents of the color,
* depth and stencil buffers as if cogl_framebuffer_discard_buffers()
* were used. The significance of the discard is that you should not
* expect to be able to start a new frame that incrementally builds on
* the contents of the previous frame. If you want to perform
* incremental updates to older back buffers then please refer to the
* cogl_onscreen_get_buffer_age() api.
*
* Whenever possible it is recommended that applications use this
* function instead of cogl_onscreen_swap_buffers() to improve
* performance when running under a compositor.
*
* <note>It is highly recommended to use this API in conjunction with
* the cogl_onscreen_get_buffer_age() api so that your application can
* perform incremental rendering based on old back buffers.</note>
*
* Since: 1.16
* Stability: unstable
*/
COGL_EXPORT void
cogl_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles,
CoglFrameInfo *info,
gpointer user_data);
/**
* cogl_onscreen_direct_scanout: (skip)
*/
COGL_EXPORT gboolean
cogl_onscreen_direct_scanout (CoglOnscreen *onscreen,
CoglScanout *scanout,
CoglFrameInfo *info,
gpointer user_data,
GError **error);
/**
* cogl_onscreen_add_frame_info: (skip)
*/
COGL_EXPORT void
cogl_onscreen_add_frame_info (CoglOnscreen *onscreen,
CoglFrameInfo *info);
/**
* cogl_onscreen_swap_region:
* @onscreen: A #CoglOnscreen framebuffer
* @rectangles: An array of integer 4-tuples representing rectangles as
* (x, y, width, height) tuples.
* @n_rectangles: The number of 4-tuples to be read from @rectangles
*
* Swaps a region of the back buffer being rendered too, to the front for
* display. @rectangles represents the region as array of @n_rectangles each
* defined by 4 sequential (x, y, width, height) integers.
*
* This function also implicitly discards the contents of the color, depth and
* stencil buffers as if cogl_framebuffer_discard_buffers() were used. The
* significance of the discard is that you should not expect to be able to
* start a new frame that incrementally builds on the contents of the previous
* frame.
*
* Since: 1.10
* Stability: unstable
*/
COGL_EXPORT void
cogl_onscreen_swap_region (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles,
CoglFrameInfo *info,
gpointer user_data);
/**
* CoglFrameEvent:
* @COGL_FRAME_EVENT_SYNC: Notifies that the system compositor has
* acknowledged a frame and is ready for a
* new frame to be created.
* @COGL_FRAME_EVENT_COMPLETE: Notifies that a frame has ended. This
* is a good time for applications to
* collect statistics about the frame
* since the #CoglFrameInfo should hold
* the most data at this point. No other
* events should be expected after a
* @COGL_FRAME_EVENT_COMPLETE event.
*
* Identifiers that are passed to #CoglFrameCallback functions
* (registered using cogl_onscreen_add_frame_callback()) that
* mark the progression of a frame in some way which usually
* means that new information will have been accumulated in the
* frame's corresponding #CoglFrameInfo object.
*
* The last event that will be sent for a frame will be a
* @COGL_FRAME_EVENT_COMPLETE event and so these are a good
* opportunity to collect statistics about a frame since the
* #CoglFrameInfo should hold the most data at this point.
*
* <note>A frame may not be completed before the next frame can start
* so applications should avoid needing to collect all statistics for
* a particular frame before they can start a new frame.</note>
*
* Since: 1.14
* Stability: unstable
*/
typedef enum _CoglFrameEvent
{
COGL_FRAME_EVENT_SYNC = 1,
COGL_FRAME_EVENT_COMPLETE
} CoglFrameEvent;
/**
* CoglFrameCallback:
* @onscreen: The onscreen that the frame is associated with
* @event: A #CoglFrameEvent notifying how the frame has progressed
* @info: The meta information, such as timing information, about
* the frame that has progressed.
* @user_data: The user pointer passed to
* cogl_onscreen_add_frame_callback()
*
* Is a callback that can be registered via
* cogl_onscreen_add_frame_callback() to be called when a frame
* progresses in some notable way.
*
* Please see the documentation for #CoglFrameEvent and
* cogl_onscreen_add_frame_callback() for more details about what
* events can be notified.
*
* Since: 1.14
* Stability: unstable
*/
typedef void (*CoglFrameCallback) (CoglOnscreen *onscreen,
CoglFrameEvent event,
CoglFrameInfo *info,
void *user_data);
/**
* CoglFrameClosure:
*
* An opaque type that tracks a #CoglFrameCallback and associated user
* data. A #CoglFrameClosure pointer will be returned from
* cogl_onscreen_add_frame_callback() and it allows you to remove a
* callback later using cogl_onscreen_remove_frame_callback().
*
* Since: 1.14
* Stability: unstable
*/
typedef struct _CoglClosure CoglFrameClosure;
/**
* cogl_frame_closure_get_gtype:
*
* Returns: a #GType that can be used with the GLib type system.
*/
COGL_EXPORT
GType cogl_frame_closure_get_gtype (void);
/**
* cogl_onscreen_add_frame_callback:
* @onscreen: A #CoglOnscreen framebuffer
* @callback: (scope notified): A callback function to call for frame events
* @user_data: (closure): A private pointer to be passed to @callback
* @destroy: (allow-none): An optional callback to destroy @user_data
* when the @callback is removed or @onscreen is freed.
*
* Installs a @callback function that will be called for significant
* events relating to the given @onscreen framebuffer.
*
* The @callback will be used to notify when the system compositor is
* ready for this application to render a new frame. In this case
* %COGL_FRAME_EVENT_SYNC will be passed as the event argument to the
* given @callback in addition to the #CoglFrameInfo corresponding to
* the frame being acknowledged by the compositor.
*
* The @callback will also be called to notify when the frame has
* ended. In this case %COGL_FRAME_EVENT_COMPLETE will be passed as
* the event argument to the given @callback in addition to the
* #CoglFrameInfo corresponding to the newly presented frame. The
* meaning of "ended" here simply means that no more timing
* information will be collected within the corresponding
* #CoglFrameInfo and so this is a good opportunity to analyse the
* given info. It does not necessarily mean that the GPU has finished
* rendering the corresponding frame.
*
* We highly recommend throttling your application according to
* %COGL_FRAME_EVENT_SYNC events so that your application can avoid
* wasting resources, drawing more frames than your system compositor
* can display.
*
* Return value: a #CoglFrameClosure pointer that can be used to
* remove the callback and associated @user_data later.
* Since: 1.14
* Stability: unstable
*/
COGL_EXPORT CoglFrameClosure *
cogl_onscreen_add_frame_callback (CoglOnscreen *onscreen,
CoglFrameCallback callback,
void *user_data,
CoglUserDataDestroyCallback destroy);
/**
* cogl_onscreen_remove_frame_callback:
* @onscreen: A #CoglOnscreen
* @closure: A #CoglFrameClosure returned from
* cogl_onscreen_add_frame_callback()
*
* Removes a callback and associated user data that were previously
* registered using cogl_onscreen_add_frame_callback().
*
* If a destroy callback was passed to
* cogl_onscreen_add_frame_callback() to destroy the user data then
* this will get called.
*
* Since: 1.14
* Stability: unstable
*/
COGL_EXPORT void
cogl_onscreen_remove_frame_callback (CoglOnscreen *onscreen,
CoglFrameClosure *closure);
/**
* CoglOnscreenDirtyInfo:
* @x: Left edge of the dirty rectangle
* @y: Top edge of the dirty rectangle, measured from the top of the window
* @width: Width of the dirty rectangle
* @height: Height of the dirty rectangle
*
* A structure passed to callbacks registered using
* cogl_onscreen_add_dirty_callback(). The members describe a
* rectangle within the onscreen buffer that should be redrawn.
*
* Since: 1.16
* Stability: unstable
*/
typedef struct _CoglOnscreenDirtyInfo CoglOnscreenDirtyInfo;
struct _CoglOnscreenDirtyInfo
{
int x, y;
int width, height;
};
/**
* CoglOnscreenDirtyCallback:
* @onscreen: The onscreen that the frame is associated with
* @info: A #CoglOnscreenDirtyInfo struct containing the details of the
* dirty area
* @user_data: The user pointer passed to
* cogl_onscreen_add_frame_callback()
*
* Is a callback that can be registered via
* cogl_onscreen_add_dirty_callback() to be called when the windowing
* system determines that a region of the onscreen window has been
* lost and the application should redraw it.
*
* Since: 1.16
* Stability: unstable
*/
typedef void (*CoglOnscreenDirtyCallback) (CoglOnscreen *onscreen,
const CoglOnscreenDirtyInfo *info,
void *user_data);
/**
* CoglOnscreenDirtyClosure:
*
* An opaque type that tracks a #CoglOnscreenDirtyCallback and associated
* user data. A #CoglOnscreenDirtyClosure pointer will be returned from
* cogl_onscreen_add_dirty_callback() and it allows you to remove a
* callback later using cogl_onscreen_remove_dirty_callback().
*
* Since: 1.16
* Stability: unstable
*/
typedef struct _CoglClosure CoglOnscreenDirtyClosure;
/**
* cogl_onscreen_dirty_closure_get_gtype:
*
* Returns: a #GType that can be used with the GLib type system.
*/
COGL_EXPORT
GType cogl_onscreen_dirty_closure_get_gtype (void);
/**
* cogl_onscreen_add_dirty_callback:
* @onscreen: A #CoglOnscreen framebuffer
* @callback: (scope notified): A callback function to call for dirty events
* @user_data: (closure): A private pointer to be passed to @callback
* @destroy: (allow-none): An optional callback to destroy @user_data when the
* @callback is removed or @onscreen is freed.
*
* Installs a @callback function that will be called whenever the
* window system has lost the contents of a region of the onscreen
* buffer and the application should redraw it to repair the buffer.
* For example this may happen in a window system without a compositor
* if a window that was previously covering up the onscreen window has
* been moved causing a region of the onscreen to be exposed.
*
* The @callback will be passed a #CoglOnscreenDirtyInfo struct which
* describes a rectangle containing the newly dirtied region. Note that
* this may be called multiple times to describe a non-rectangular
* region composed of multiple smaller rectangles.
*
* The dirty events are separate from %COGL_FRAME_EVENT_SYNC events so
* the application should also listen for this event before rendering
* the dirty region to ensure that the framebuffer is actually ready
* for rendering.
*
* Return value: a #CoglOnscreenDirtyClosure pointer that can be used to
* remove the callback and associated @user_data later.
* Since: 1.16
* Stability: unstable
*/
COGL_EXPORT CoglOnscreenDirtyClosure *
cogl_onscreen_add_dirty_callback (CoglOnscreen *onscreen,
CoglOnscreenDirtyCallback callback,
void *user_data,
CoglUserDataDestroyCallback destroy);
/**
* cogl_onscreen_remove_dirty_callback:
* @onscreen: A #CoglOnscreen
* @closure: A #CoglOnscreenDirtyClosure returned from
* cogl_onscreen_add_dirty_callback()
*
* Removes a callback and associated user data that were previously
* registered using cogl_onscreen_add_dirty_callback().
*
* If a destroy callback was passed to
* cogl_onscreen_add_dirty_callback() to destroy the user data then
* this will also get called.
*
* Since: 1.16
* Stability: unstable
*/
COGL_EXPORT void
cogl_onscreen_remove_dirty_callback (CoglOnscreen *onscreen,
CoglOnscreenDirtyClosure *closure);
/**
* cogl_onscreen_get_frame_counter:
*
* Gets the value of the framebuffers frame counter. This is
* a counter that increases by one each time
* cogl_onscreen_swap_buffers() or cogl_onscreen_swap_region()
* is called.
*
* Return value: the current frame counter value
* Since: 1.14
* Stability: unstable
*/
COGL_EXPORT int64_t
cogl_onscreen_get_frame_counter (CoglOnscreen *onscreen);
G_END_DECLS
#endif /* __COGL_ONSCREEN_H */
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