diff --git a/cogl/cogl-onscreen.c b/cogl/cogl-onscreen.c
index 6b3cea1b3..ab898fbed 100644
--- a/cogl/cogl-onscreen.c
+++ b/cogl/cogl-onscreen.c
@@ -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,
diff --git a/cogl/cogl-onscreen.h b/cogl/cogl-onscreen.h
index 4389a43a3..9e58a3b85 100644
--- a/cogl/cogl-onscreen.h
+++ b/cogl/cogl-onscreen.h
@@ -322,6 +322,12 @@ cogl_onscreen_hide (CoglOnscreen *onscreen);
* start a new frame that incrementally builds on the contents of the previous
* frame.
*
+ * 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.
+ *
* 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.
+ *
+ * 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.
+ *
+ * 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
diff --git a/cogl/winsys/cogl-winsys-egl-feature-functions.h b/cogl/winsys/cogl-winsys-egl-feature-functions.h
index 5068090a2..24cc80522 100644
--- a/cogl/winsys/cogl-winsys-egl-feature-functions.h
+++ b/cogl/winsys/cogl-winsys-egl-feature-functions.h
@@ -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 ()
diff --git a/cogl/winsys/cogl-winsys-egl-kms.c b/cogl/winsys/cogl-winsys-egl-kms.c
index a2ec7b988..d24ef243a 100644
--- a/cogl/winsys/cogl-winsys-egl-kms.c
+++ b/cogl/winsys/cogl-winsys-egl-kms.c
@@ -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;
}
diff --git a/cogl/winsys/cogl-winsys-egl-wayland.c b/cogl/winsys/cogl-winsys-egl-wayland.c
index 4fc6b8888..4b7c8c154 100644
--- a/cogl/winsys/cogl-winsys-egl-wayland.c
+++ b/cogl/winsys/cogl-winsys-egl-wayland.c
@@ -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;
}
diff --git a/cogl/winsys/cogl-winsys-egl.c b/cogl/winsys/cogl-winsys-egl.c
index 99476523b..c81790ca7 100644
--- a/cogl/winsys/cogl-winsys-egl.c
+++ b/cogl/winsys/cogl-winsys-egl.c
@@ -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 =
diff --git a/cogl/winsys/cogl-winsys-glx.c b/cogl/winsys/cogl-winsys-glx.c
index eb4aff6fb..e0e2b0c88 100644
--- a/cogl/winsys/cogl-winsys-glx.c
+++ b/cogl/winsys/cogl-winsys-glx.c
@@ -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 =
diff --git a/cogl/winsys/cogl-winsys-private.h b/cogl/winsys/cogl-winsys-private.h
index b7c727ee4..ac67deea6 100644
--- a/cogl/winsys/cogl-winsys-private.h
+++ b/cogl/winsys/cogl-winsys-private.h
@@ -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);
diff --git a/cogl/winsys/cogl-winsys-sdl.c b/cogl/winsys/cogl-winsys-sdl.c
index 6cb246ec0..ed8212e3a 100644
--- a/cogl/winsys/cogl-winsys-sdl.c
+++ b/cogl/winsys/cogl-winsys-sdl.c
@@ -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;
diff --git a/cogl/winsys/cogl-winsys-sdl2.c b/cogl/winsys/cogl-winsys-sdl2.c
index dc0fad5f1..5595f461f 100644
--- a/cogl/winsys/cogl-winsys-sdl2.c
+++ b/cogl/winsys/cogl-winsys-sdl2.c
@@ -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;
diff --git a/cogl/winsys/cogl-winsys-stub.c b/cogl/winsys/cogl-winsys-stub.c
index aee70a91d..55ae3e268 100644
--- a/cogl/winsys/cogl-winsys-stub.c
+++ b/cogl/winsys/cogl-winsys-stub.c
@@ -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;
diff --git a/cogl/winsys/cogl-winsys-wgl.c b/cogl/winsys/cogl-winsys-wgl.c
index 33e7ad2f2..ce2e97c36 100644
--- a/cogl/winsys/cogl-winsys-wgl.c
+++ b/cogl/winsys/cogl-winsys-wgl.c
@@ -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;
diff --git a/doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt b/doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt
index 006de1e71..247516095 100644
--- a/doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt
+++ b/doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt
@@ -618,6 +618,7 @@ cogl_onscreen_remove_resize_callback
cogl_onscreen_swap_buffers
+cogl_onscreen_swap_buffers_with_damage
cogl_onscreen_swap_region
cogl_onscreen_set_swap_throttled
CoglSwapBuffersNotify