[PATCH v20 03/10] compositor-drm: Add modes to drm_output_propose_state
Pekka Paalanen
ppaalanen at gmail.com
Wed Jul 11 11:22:07 UTC 2018
On Wed, 11 Jul 2018 11:41:27 +0100
Daniel Stone <daniels at collabora.com> wrote:
> Add support for multiple modes to drm_output_propose_state. Currently we
> intend to operate in three modes: planes-only (no renderer buffer,
> client buffers in planes only), mixed-mode (promote client buffers to
> planes where possible, falling back to the renderer where not), and
> renderer-only (no plane usage at all).
>
> We want to use the first (planes-only) mode where possible: it can avoid
> us having to allocate buffers for the renderer, and it also gives us the
> best chance of the optimal configuration, with no composition. In this
> mode, we walk the scene looking at all views, trying to put them in
> planes, and failing as soon as we find a view we cannot place in a
> plane.
>
> In the second mode, rather than failing, we assign those views which
> cannot be on a plane to the renderer, and allow the renderer to
> composite them.
>
> In the third mode, planes are not usable, so everything but the cursor
> goes to the renderer. We will use this when we cannot use the planes-only
> mode (because some views cannot be placed in planes), but also cannot
> use the 'mixed' mode because we have no renderer buffer yet. Since we
> walk the scene graph from top to bottom, using atomic modesetting we
> will determine if planes can be promoted in mixed mode by placing a
> renderer buffer at the bottom of the scene, placing a cursor buffer if
> applicable, then testing if we can add overlay planes to this mode.
>
> Without a buffer from the renderer, we cannot do these tests, so we push
> everything through the renderer and then switch to mixed mode on the
> next repaint.
>
> This patch implements the mixed and renderer-only modes (previously
> differentiated only by the sprites_are_broken flag), with the
> planes-only mode being left for a later patch.
>
> Signed-off-by: Daniel Stone <daniels at collabora.com>
> ---
> libweston/compositor-drm.c | 70 ++++++++++++++++++++++++--------------
> 1 file changed, 45 insertions(+), 25 deletions(-)
Reviewed-by: Pekka Paalanen <pekka.paalanen at collabora.co.uk>
Thanks,
pq
>
> diff --git a/libweston/compositor-drm.c b/libweston/compositor-drm.c
> index d045778aa..56e7e5d1f 100644
> --- a/libweston/compositor-drm.c
> +++ b/libweston/compositor-drm.c
> @@ -1939,6 +1939,11 @@ drm_output_assign_state(struct drm_output_state *state,
> }
> }
>
> +enum drm_output_propose_state_mode {
> + DRM_OUTPUT_PROPOSE_STATE_MIXED, /**< mix renderer & planes */
> + DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY, /**< only assign to renderer & cursor */
> +};
> +
> static struct weston_plane *
> drm_output_prepare_scanout_view(struct drm_output_state *output_state,
> struct weston_view *ev)
> @@ -3121,10 +3126,9 @@ drm_output_prepare_cursor_view(struct drm_output_state *output_state,
> struct wl_shm_buffer *shmbuf;
> bool needs_update = false;
>
> - if (!plane)
> - return NULL;
> + assert(!b->cursors_are_broken);
>
> - if (b->cursors_are_broken)
> + if (!plane)
> return NULL;
>
> if (!plane->state_cur->complete)
> @@ -3259,7 +3263,8 @@ err:
>
> static struct drm_output_state *
> drm_output_propose_state(struct weston_output *output_base,
> - struct drm_pending_state *pending_state)
> + struct drm_pending_state *pending_state,
> + enum drm_output_propose_state_mode mode)
> {
> struct drm_output *output = to_drm_output(output_base);
> struct drm_backend *b = to_drm_backend(output->base.compositor);
> @@ -3267,6 +3272,7 @@ drm_output_propose_state(struct weston_output *output_base,
> struct weston_view *ev;
> pixman_region32_t surface_overlap, renderer_region, occluded_region;
> struct weston_plane *primary = &output_base->compositor->primary_plane;
> + bool planes_ok = (mode != DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY);
>
> assert(!output->state_last);
> state = drm_output_state_duplicate(output->state_cur,
> @@ -3339,13 +3345,16 @@ drm_output_propose_state(struct weston_output *output_base,
> next_plane = primary;
> pixman_region32_fini(&surface_overlap);
>
> - if (next_plane == NULL)
> + /* The cursor plane is 'special' in the sense that we can still
> + * place it in the legacy API, and we gate that with a separate
> + * cursors_are_broken flag. */
> + if (next_plane == NULL && !b->cursors_are_broken)
> next_plane = drm_output_prepare_cursor_view(state, ev);
>
> if (next_plane == NULL && !drm_view_is_opaque(ev))
> next_plane = primary;
>
> - if (next_plane == NULL && b->sprites_are_broken)
> + if (next_plane == NULL && !planes_ok)
> next_plane = primary;
>
> if (next_plane == NULL)
> @@ -3354,24 +3363,27 @@ drm_output_propose_state(struct weston_output *output_base,
> if (next_plane == NULL)
> next_plane = drm_output_prepare_overlay_view(state, ev);
>
> - if (next_plane == NULL)
> - next_plane = primary;
> + if (next_plane && next_plane != primary) {
> + /* If we have been assigned to an overlay or scanout
> + * plane, add this area to the occluded region, so
> + * other views are known to be behind it. The cursor
> + * plane, however, is special, in that it blends with
> + * the content underneath it: the area should neither
> + * be added to the renderer region nor the occluded
> + * region. */
> + if (!output->cursor_plane ||
> + next_plane != &output->cursor_plane->base) {
> + pixman_region32_union(&occluded_region,
> + &occluded_region,
> + &clipped_view);
> + pixman_region32_fini(&clipped_view);
> + }
> + continue;
> + }
>
> - /* If we've been assigned to the 'primary' (renderer) plane,
> - * add this to our renderer region. If we have been assigned
> - * to the cursor plane, do nothing, as the cursor plane is
> - * blended with content underneath it. If neither, we have
> - * been assigned to an overlay plane, so add this view's
> - * area to the occluded region. */
> - if (next_plane == primary)
> - pixman_region32_union(&renderer_region,
> - &renderer_region,
> - &clipped_view);
> - else if (!output->cursor_plane ||
> - next_plane != &output->cursor_plane->base)
> - pixman_region32_union(&occluded_region,
> - &occluded_region,
> - &clipped_view);
> + pixman_region32_union(&renderer_region,
> + &renderer_region,
> + &clipped_view);
> pixman_region32_fini(&clipped_view);
> }
> pixman_region32_fini(&renderer_region);
> @@ -3386,12 +3398,20 @@ drm_assign_planes(struct weston_output *output_base, void *repaint_data)
> struct drm_backend *b = to_drm_backend(output_base->compositor);
> struct drm_pending_state *pending_state = repaint_data;
> struct drm_output *output = to_drm_output(output_base);
> - struct drm_output_state *state;
> + struct drm_output_state *state = NULL;
> struct drm_plane_state *plane_state;
> struct weston_view *ev;
> struct weston_plane *primary = &output_base->compositor->primary_plane;
>
> - state = drm_output_propose_state(output_base, pending_state);
> + if (!b->sprites_are_broken)
> + state = drm_output_propose_state(output_base, pending_state,
> + DRM_OUTPUT_PROPOSE_STATE_MIXED);
> +
> + if (!state)
> + state = drm_output_propose_state(output_base, pending_state,
> + DRM_OUTPUT_PROPOSE_STATE_RENDERER_ONLY);
> +
> + assert(state);
>
> wl_list_for_each(ev, &output_base->compositor->view_list, link) {
> struct drm_plane *target_plane = NULL;
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