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onscreen: Adds swap_buffers_with_damage api

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This adds api to be able requests a swap_buffers and also pass a list of
damage rectangles that can be passed on to a compositor to enable it to
minimize how much of the screen it needs to recompose.

Reviewed-by: Neil Roberts <neil@linux.intel.com>

(cherry picked from commit 0d9684c7b7c2018bb42715c369555330d38514a2)
This commit is contained in:
Robert Bragg 2012-02-07 17:59:51 +00:00
parent 95a41e177a
commit 3a7c1263f1
13 changed files with 154 additions and 24 deletions
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13
cogl/cogl-onscreen.c
View file

@ -165,7 +165,9 @@ _cogl_onscreen_queue_event (CoglOnscreen *onscreen,
}
void
cogl_onscreen_swap_buffers (CoglOnscreen *onscreen)
cogl_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
const CoglWinsysVtable *winsys;
@ -181,7 +183,8 @@ cogl_onscreen_swap_buffers (CoglOnscreen *onscreen)
cogl_flush ();
winsys = _cogl_framebuffer_get_winsys (framebuffer);
winsys->onscreen_swap_buffers (COGL_ONSCREEN (framebuffer));
winsys->onscreen_swap_buffers_with_damage (onscreen,
rectangles, n_rectangles);
cogl_framebuffer_discard_buffers (framebuffer,
COGL_BUFFER_BIT_COLOR |
COGL_BUFFER_BIT_DEPTH |
@ -204,6 +207,12 @@ cogl_onscreen_swap_buffers (CoglOnscreen *onscreen)
onscreen->frame_counter++;
}
void
cogl_onscreen_swap_buffers (CoglOnscreen *onscreen)
{
cogl_onscreen_swap_buffers_with_damage (onscreen, NULL, 0);
}
void
cogl_onscreen_swap_region (CoglOnscreen *onscreen,
const int *rectangles,

59
cogl/cogl-onscreen.h
View file

@ -322,6 +322,12 @@ cogl_onscreen_hide (CoglOnscreen *onscreen);
* 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
*/
@ -376,6 +382,59 @@ cogl_onscreen_swap_buffers (CoglOnscreen *onscreen);
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
*/
void
cogl_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles);
/**
* cogl_onscreen_swap_region:
* @onscreen: A #CoglOnscreen framebuffer

11
cogl/winsys/cogl-winsys-egl-feature-functions.h
View file

@ -101,3 +101,14 @@ COGL_WINSYS_FEATURE_BEGIN (buffer_age,
COGL_WINSYS_FEATURE_END ()
#endif
COGL_WINSYS_FEATURE_BEGIN (swap_buffers_with_damage,
"EXT\0",
"swap_buffers_with_damage\0",
0)
COGL_WINSYS_FEATURE_FUNCTION (EGLBoolean, eglSwapBuffersWithDamage,
(EGLDisplay dpy,
EGLSurface surface,
const EGLint *rects,
EGLint n_rects))
COGL_WINSYS_FEATURE_END ()

12
cogl/winsys/cogl-winsys-egl-kms.c
View file

@ -719,7 +719,9 @@ _cogl_winsys_egl_cleanup_context (CoglDisplay *display)
}
static void
_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
_cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglDisplayEGL *egl_display = context->display->winsys;
@ -737,8 +739,9 @@ _cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
while (kms_onscreen->next_fb_id != 0)
handle_drm_event (kms_renderer);
/* First chain-up. This will call eglSwapBuffers */
parent_vtable->onscreen_swap_buffers (onscreen);
parent_vtable->onscreen_swap_buffers_with_damage (onscreen,
rectangles,
n_rectangles);
/* Now we need to set the CRTC to whatever is the front buffer */
kms_onscreen->next_bo = gbm_surface_lock_front_buffer (kms_onscreen->surface);
@ -963,7 +966,8 @@ _cogl_winsys_egl_kms_get_vtable (void)
/* The KMS winsys doesn't support swap region */
vtable.onscreen_swap_region = NULL;
vtable.onscreen_swap_buffers = _cogl_winsys_onscreen_swap_buffers;
vtable.onscreen_swap_buffers_with_damage =
_cogl_winsys_onscreen_swap_buffers_with_damage;
vtable_inited = TRUE;
}

12
cogl/winsys/cogl-winsys-egl-wayland.c
View file

@ -418,7 +418,9 @@ _cogl_winsys_egl_onscreen_deinit (CoglOnscreen *onscreen)
}
static void
_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
_cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles)
{
CoglFramebuffer *fb = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = fb->context;
@ -442,8 +444,9 @@ _cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
wayland_onscreen->has_pending = FALSE;
}
/* chain-up */
parent_vtable->onscreen_swap_buffers (onscreen);
parent_vtable->onscreen_swap_buffers_with_damage (onscreen,
rectangles,
n_rectangles);
/*
* The implementation of eglSwapBuffers may do a flush however the semantics
@ -648,7 +651,8 @@ _cogl_winsys_egl_wayland_get_vtable (void)
vtable.renderer_connect = _cogl_winsys_renderer_connect;
vtable.renderer_disconnect = _cogl_winsys_renderer_disconnect;
vtable.onscreen_swap_buffers = _cogl_winsys_onscreen_swap_buffers;
vtable.onscreen_swap_buffers_with_damage =
_cogl_winsys_onscreen_swap_buffers_with_damage;
vtable_inited = TRUE;
}

31
cogl/winsys/cogl-winsys-egl.c
View file

@ -784,7 +784,9 @@ _cogl_winsys_onscreen_swap_region (CoglOnscreen *onscreen,
}
static void
_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
_cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles)
{
CoglContext *context = COGL_FRAMEBUFFER (onscreen)->context;
CoglRenderer *renderer = context->display->renderer;
@ -800,7 +802,29 @@ _cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
COGL_FRAMEBUFFER (onscreen),
COGL_FRAMEBUFFER_STATE_BIND);
eglSwapBuffers (egl_renderer->edpy, egl_onscreen->egl_surface);
if (n_rectangles && egl_renderer->pf_eglSwapBuffersWithDamage)
{
CoglFramebuffer *fb = COGL_FRAMEBUFFER (onscreen);
size_t size = n_rectangles * sizeof (int) * 4;
int *flipped = alloca (size);
int i;
memcpy (flipped, rectangles, size);
for (i = 0; i < n_rectangles; i++)
{
const int *rect = rectangles + 4 * i;
int *flip_rect = flipped + 4 * i;
flip_rect[1] = fb->height - rect[1] - rect[3];
}
if (egl_renderer->pf_eglSwapBuffersWithDamage (egl_renderer->edpy,
egl_onscreen->egl_surface,
flipped,
n_rectangles) == EGL_FALSE)
g_warning ("Error reported by eglSwapBuffersWithDamage");
}
else
eglSwapBuffers (egl_renderer->edpy, egl_onscreen->egl_surface);
}
static void
@ -901,7 +925,8 @@ static CoglWinsysVtable _cogl_winsys_vtable =
.onscreen_init = _cogl_winsys_onscreen_init,
.onscreen_deinit = _cogl_winsys_onscreen_deinit,
.onscreen_bind = _cogl_winsys_onscreen_bind,
.onscreen_swap_buffers = _cogl_winsys_onscreen_swap_buffers,
.onscreen_swap_buffers_with_damage =
_cogl_winsys_onscreen_swap_buffers_with_damage,
.onscreen_swap_region = _cogl_winsys_onscreen_swap_region,
.onscreen_get_buffer_age = _cogl_winsys_onscreen_get_buffer_age,
.onscreen_update_swap_throttled =

7
cogl/winsys/cogl-winsys-glx.c
View file

@ -1869,7 +1869,9 @@ _cogl_winsys_onscreen_swap_region (CoglOnscreen *onscreen,
}
static void
_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
_cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles)
{
CoglFramebuffer *framebuffer = COGL_FRAMEBUFFER (onscreen);
CoglContext *context = framebuffer->context;
@ -2623,7 +2625,8 @@ static CoglWinsysVtable _cogl_winsys_vtable =
.onscreen_init = _cogl_winsys_onscreen_init,
.onscreen_deinit = _cogl_winsys_onscreen_deinit,
.onscreen_bind = _cogl_winsys_onscreen_bind,
.onscreen_swap_buffers = _cogl_winsys_onscreen_swap_buffers,
.onscreen_swap_buffers_with_damage =
_cogl_winsys_onscreen_swap_buffers_with_damage,
.onscreen_swap_region = _cogl_winsys_onscreen_swap_region,
.onscreen_get_buffer_age = _cogl_winsys_onscreen_get_buffer_age,
.onscreen_update_swap_throttled =

4
cogl/winsys/cogl-winsys-private.h
View file

@ -111,7 +111,9 @@ typedef struct _CoglWinsysVtable
(*onscreen_bind) (CoglOnscreen *onscreen);
void
(*onscreen_swap_buffers) (CoglOnscreen *onscreen);
(*onscreen_swap_buffers_with_damage) (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles);
void
(*onscreen_update_swap_throttled) (CoglOnscreen *onscreen);

7
cogl/winsys/cogl-winsys-sdl.c
View file

@ -362,7 +362,9 @@ _cogl_winsys_onscreen_init (CoglOnscreen *onscreen,
}
static void
_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
_cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles)
{
SDL_GL_SwapBuffers ();
}
@ -430,7 +432,8 @@ _cogl_winsys_sdl_get_vtable (void)
vtable.onscreen_init = _cogl_winsys_onscreen_init;
vtable.onscreen_deinit = _cogl_winsys_onscreen_deinit;
vtable.onscreen_bind = _cogl_winsys_onscreen_bind;
vtable.onscreen_swap_buffers = _cogl_winsys_onscreen_swap_buffers;
vtable.onscreen_swap_buffers_with_damage =
_cogl_winsys_onscreen_swap_buffers_with_damage;
vtable.onscreen_update_swap_throttled =
_cogl_winsys_onscreen_update_swap_throttled;
vtable.onscreen_set_visibility = _cogl_winsys_onscreen_set_visibility;

7
cogl/winsys/cogl-winsys-sdl2.c
View file

@ -497,7 +497,9 @@ _cogl_winsys_onscreen_init (CoglOnscreen *onscreen,
}
static void
_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
_cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles)
{
CoglOnscreenSdl2 *sdl_onscreen = onscreen->winsys;
@ -572,7 +574,8 @@ _cogl_winsys_sdl_get_vtable (void)
vtable.onscreen_init = _cogl_winsys_onscreen_init;
vtable.onscreen_deinit = _cogl_winsys_onscreen_deinit;
vtable.onscreen_bind = _cogl_winsys_onscreen_bind;
vtable.onscreen_swap_buffers = _cogl_winsys_onscreen_swap_buffers;
vtable.onscreen_swap_buffers_with_damage =
_cogl_winsys_onscreen_swap_buffers_with_damage;
vtable.onscreen_update_swap_throttled =
_cogl_winsys_onscreen_update_swap_throttled;
vtable.onscreen_set_visibility = _cogl_winsys_onscreen_set_visibility;

7
cogl/winsys/cogl-winsys-stub.c
View file

@ -133,7 +133,9 @@ _cogl_winsys_onscreen_bind (CoglOnscreen *onscreen)
}
static void
_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
_cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles)
{
}
@ -176,7 +178,8 @@ _cogl_winsys_stub_get_vtable (void)
vtable.onscreen_init = _cogl_winsys_onscreen_init;
vtable.onscreen_deinit = _cogl_winsys_onscreen_deinit;
vtable.onscreen_bind = _cogl_winsys_onscreen_bind;
vtable.onscreen_swap_buffers = _cogl_winsys_onscreen_swap_buffers;
vtable.onscreen_swap_buffers_with_damage =
_cogl_winsys_onscreen_swap_buffers_with_damage;
vtable.onscreen_update_swap_throttled =
_cogl_winsys_onscreen_update_swap_throttled;
vtable.onscreen_set_visibility = _cogl_winsys_onscreen_set_visibility;

7
cogl/winsys/cogl-winsys-wgl.c
View file

@ -836,7 +836,9 @@ _cogl_winsys_onscreen_init (CoglOnscreen *onscreen,
}
static void
_cogl_winsys_onscreen_swap_buffers (CoglOnscreen *onscreen)
_cogl_winsys_onscreen_swap_buffers_with_damage (CoglOnscreen *onscreen,
const int *rectangles,
int n_rectangles)
{
CoglOnscreenWgl *wgl_onscreen = onscreen->winsys;
@ -901,7 +903,8 @@ _cogl_winsys_wgl_get_vtable (void)
vtable.onscreen_init = _cogl_winsys_onscreen_init;
vtable.onscreen_deinit = _cogl_winsys_onscreen_deinit;
vtable.onscreen_bind = _cogl_winsys_onscreen_bind;
vtable.onscreen_swap_buffers = _cogl_winsys_onscreen_swap_buffers;
vtable.onscreen_swap_buffers_with_damage =
_cogl_winsys_onscreen_swap_buffers_with_damage;
vtable.onscreen_update_swap_throttled =
_cogl_winsys_onscreen_update_swap_throttled;
vtable.onscreen_set_visibility = _cogl_winsys_onscreen_set_visibility;

1
doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt
View file

@ -618,6 +618,7 @@ cogl_onscreen_remove_resize_callback
<SUBSECTION>
cogl_onscreen_swap_buffers
cogl_onscreen_swap_buffers_with_damage
cogl_onscreen_swap_region
cogl_onscreen_set_swap_throttled
CoglSwapBuffersNotify