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backend-drm: Build scene-graph before assigning planes

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So far scene-graph building and plane assignment happened within a single
loop. In the future we want to be able to optimize the scene-graph
before assigning, thus split up the loop into two steps.

No behavioral changes intended.

Signed-off-by: Robert Mader <robert.mader@collabora.com>
This commit is contained in:
Robert Mader 2025-09-04 18:07:39 +02:00
parent 564f6687eb
commit c7cdcedbf0
1 changed files with 34 additions and 12 deletions
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46
libweston/backend-drm/state-propose.c
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@ -762,6 +762,9 @@ drm_output_propose_state(struct weston_output *output_base,
struct drm_output_state *state;
struct drm_plane_state *scanout_state = NULL;
struct weston_paint_node **visible_pnode;
struct wl_array visible_pnodes;
pixman_region32_t renderer_region;
bool renderer_ok = (mode != DRM_OUTPUT_PROPOSE_STATE_PLANES_ONLY);
@ -838,22 +841,16 @@ drm_output_propose_state(struct weston_output *output_base,
scanout_state->zpos);
}
/* - renderer_region contains the total region which which will be
* covered by the renderer and underlay region.
*/
pixman_region32_init(&renderer_region);
/* Build an array of paint nodes that will be visible on screen. Doing
* so before assigning them to hardware planes or the renderer allows
* us to apply optimizations. */
wl_array_init(&visible_pnodes);
wl_list_for_each(pnode, &output->base.paint_node_z_order_list,
z_order_link) {
struct weston_view *ev = pnode->view;
struct drm_plane_state *ps = NULL;
pixman_region32_t tmp;
bool need_underlay = false;
pnode->try_view_on_plane_failure_reasons = FAILURE_REASONS_NONE;
drm_debug(b, "\t\t\t[view] evaluating view %p for "
"output %s (%lu)\n",
drm_debug(b, "\t\t\t[view] evaluating view %p for scene-graph "
"building on output %s (%lu)\n",
ev, output->base.name,
(unsigned long) output->base.id);
@ -881,6 +878,29 @@ drm_output_propose_state(struct weston_output *output_base,
continue;
}
visible_pnode = wl_array_add(&visible_pnodes, sizeof(pnode));
*visible_pnode = pnode;
}
/* renderer_region contains the total region which which will be
* covered by the renderer and underlay region. */
pixman_region32_init(&renderer_region);
/* Assign paint nodes to planes. */
wl_array_for_each(visible_pnode, &visible_pnodes) {
struct weston_paint_node *pnode = *visible_pnode;
struct weston_view *ev = pnode->view;
struct drm_plane_state *ps = NULL;
bool need_underlay = false;
pixman_region32_t tmp;
pnode->try_view_on_plane_failure_reasons = FAILURE_REASONS_NONE;
drm_debug(b, "\t\t\t[view] evaluating view %p for plane "
"assignment on output %s (%lu)\n",
ev, output->base.name,
(unsigned long) output->base.id);
if (!b->gbm)
pnode->try_view_on_plane_failure_reasons |=
FAILURE_REASONS_NO_GBM;
@ -991,6 +1011,7 @@ drm_output_propose_state(struct weston_output *output_base,
}
pixman_region32_fini(&renderer_region);
wl_array_release(&visible_pnodes);
/* In renderer-only and renderer-and-cursor modes, we can't test the
* state as we don't have a renderer buffer yet. */
@ -1022,6 +1043,7 @@ drm_output_propose_state(struct weston_output *output_base,
err_region:
pixman_region32_fini(&renderer_region);
wl_array_release(&visible_pnodes);
err:
drm_output_state_free(state);
return NULL;