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backends: Enable partial update on clipped redraws

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Mutter already calculates and tracks the damage rectangles to redraw
only areas of the screen that change since the last time a buffer was
used.
This patch extends this by using the EGL_KHR_partial_update extension to
inform the GPU in advance that only those areas will be changed, which
may allow for further optimization.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2023>
This commit is contained in:
Erico Nunes 2021-09-22 22:26:23 +02:00 committed by Marge Bot
parent 87965b5ce2
commit 577c4711e1
1 changed files with 44 additions and 0 deletions
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44
src/backends/meta-stage-impl.c
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@ -199,6 +199,48 @@ paint_damage_region (ClutterStageWindow *stage_window,
cogl_framebuffer_pop_matrix (framebuffer);
}
static void
queue_damage_region (ClutterStageWindow *stage_window,
ClutterStageView *stage_view,
cairo_region_t *damage_region)
{
int *damage, n_rects, i;
g_autofree int *freeme = NULL;
CoglFramebuffer *framebuffer;
CoglOnscreen *onscreen;
if (cairo_region_is_empty (damage_region))
return;
framebuffer = clutter_stage_view_get_onscreen (stage_view);
if (!COGL_IS_ONSCREEN (framebuffer))
return;
onscreen = COGL_ONSCREEN (framebuffer);
n_rects = cairo_region_num_rectangles (damage_region);
if (n_rects < MAX_STACK_RECTS)
damage = g_newa (int, n_rects * 4);
else
damage = freeme = g_new (int, n_rects * 4);
for (i = 0; i < n_rects; i++)
{
cairo_rectangle_int_t rect;
int height = cogl_framebuffer_get_height (framebuffer);
cairo_region_get_rectangle (damage_region, i, &rect);
damage[i * 4] = rect.x;
/* y coordinate needs to be flipped for OpenGL */
damage[i * 4 + 1] = height - rect.y - rect.height;
damage[i * 4 + 2] = rect.width;
damage[i * 4 + 3] = rect.height;
}
cogl_onscreen_queue_damage_region (onscreen, damage, n_rects);
}
static void
swap_framebuffer (ClutterStageWindow *stage_window,
ClutterStageView *stage_view,
@ -550,6 +592,8 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl *stage_impl,
}
else if (use_clipped_redraw)
{
queue_damage_region (stage_window, stage_view, fb_clip_region);
cogl_framebuffer_push_region_clip (fb, fb_clip_region);
paint_stage (stage_impl, stage_view, redraw_clip);