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scene: try to import buffers as textures before rendering

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The wlroots APIs currently don't allow importing/uploading a buffer
during rendering operations. Scene-graph buffer nodes need to turn
their wlr_buffer into a wlr_texture at some point. It's not always
possible to do so at wlr_scene_buffer creation time because the
scene-graph may have zero outputs at this point, thus no way to
grab a wlr_renderer.

Instead, add scene-graph buffers to a pending list and try to import
them in wlr_scene_output_commit.

References: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3354
This commit is contained in:
Simon Ser 2022-01-18 14:27:37 +01:00 committed by Kenny Levinsen
parent 3cfe29b598
commit 3db1bcbe64
2 changed files with 18 additions and 0 deletions
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4
include/wlr/types/wlr_scene.h
View file

@ -68,6 +68,9 @@ struct wlr_scene {
// May be NULL
struct wlr_presentation *presentation;
struct wl_listener presentation_destroy;
// List of buffers which need to be imported as textures
struct wl_list pending_buffers; // wlr_scene_buffer.pending_link
};
/** A sub-tree in the scene-graph. */
@ -114,6 +117,7 @@ struct wlr_scene_buffer {
struct wlr_fbox src_box;
int dst_width, dst_height;
enum wl_output_transform transform;
struct wl_list pending_link; // wlr_scene.pending_buffers
};
/** A viewport for an output in the scene-graph */

14
types/scene/wlr_scene.c
View file

@ -130,6 +130,7 @@ void wlr_scene_node_destroy(struct wlr_scene_node *node) {
break;
case WLR_SCENE_NODE_BUFFER:;
struct wlr_scene_buffer *scene_buffer = scene_buffer_from_node(node);
wl_list_remove(&scene_buffer->pending_link);
wlr_texture_destroy(scene_buffer->texture);
wlr_buffer_unlock(scene_buffer->buffer);
free(scene_buffer);
@ -145,6 +146,7 @@ struct wlr_scene *wlr_scene_create(void) {
scene_node_init(&scene->node, WLR_SCENE_NODE_ROOT, NULL);
wl_list_init(&scene->outputs);
wl_list_init(&scene->presentation_destroy.link);
wl_list_init(&scene->pending_buffers);
return scene;
}
@ -360,6 +362,9 @@ struct wlr_scene_buffer *wlr_scene_buffer_create(struct wlr_scene_node *parent,
scene_node_damage_whole(&scene_buffer->node);
struct wlr_scene *scene = scene_node_get_root(parent);
wl_list_insert(&scene->pending_buffers, &scene_buffer->pending_link);
return scene_buffer;
}
@ -1113,6 +1118,15 @@ bool wlr_scene_output_commit(struct wlr_scene_output *scene_output) {
return true;
}
// Try to import new buffers as textures
struct wlr_scene_buffer *scene_buffer, *scene_buffer_tmp;
wl_list_for_each_safe(scene_buffer, scene_buffer_tmp,
&scene_output->scene->pending_buffers, pending_link) {
scene_buffer_get_texture(scene_buffer, renderer);
wl_list_remove(&scene_buffer->pending_link);
wl_list_init(&scene_buffer->pending_link);
}
wlr_renderer_begin(renderer, output->width, output->height);
int nrects;