Merge branch 'backend-selection' into main

- Implement runtime backend selection (Wayland, X11, Cocoa)
- Add native X11 backend with clipboard, keyboard, mouse, and placement
- Integrate multi-backend integration tests running under Weston and Xwayland
- Retain zero-hole struct packing, branchless ALU/LUT primitives, and paced event loop

1 files changed, 49 insertions, 50 deletions

diff --git a/src/wayland/pointer.c b/src/wayland/pointer.c
index 5f97370..d434047 100644
--- a/src/wayland/pointer.c
+++ b/src/wayland/pointer.c
@@ -30,7 +30,7 @@ static inline int device_px_round(double v)
     return (int)lrint(v);
 }
 
-static struct yasl_vector2i device_from_fixed(const struct yasl_surface *w,
+static struct yasl_vector2i device_from_fixed(const struct wayland_surface *w,
                                               wl_fixed_t x, wl_fixed_t y)
 {
     return (struct yasl_vector2i){
@@ -85,23 +85,23 @@ void seat_note_input(struct seat *s, uint32_t serial)
     s->conn->active_seat = s;
 }
 
-struct seat *conn_active_seat(const struct yasl_display *c)
+struct seat *conn_active_seat(const struct wayland_display *c)
 {
     return c->active_seat ? c->active_seat : c->seats;
 }
 
-static void push_mouse(struct seat *s, struct yasl_surface *w, struct yasl_mouse_event ev)
+static void push_mouse(struct seat *s, struct wayland_surface *w, struct yasl_mouse_event ev)
 {
     ev.mods = (unsigned)seat_modifiers(s);
     struct yasl_input_event input_ev = {
         .kind = YASL_INPUT_MOUSE,
-        .surface = w,
+        .surface = &w->base,
         .mouse = ev,
     };
     input_queue_push(&surface_root(w)->input, &input_ev);
 }
 
-static void report_mouse(struct seat *s, struct yasl_surface *w, struct yasl_vector2i pos,
+static void report_mouse(struct seat *s, struct wayland_surface *w, struct yasl_vector2i pos,
                          int button, enum yasl_pointer_kind kind)
 {
     push_mouse(s, w, (struct yasl_mouse_event){
@@ -109,7 +109,7 @@ static void report_mouse(struct seat *s, struct yasl_surface *w, struct yasl_vec
     });
 }
 
-static void report_wheel(struct seat *s, struct yasl_surface *w, struct yasl_vector2i pos,
+static void report_wheel(struct seat *s, struct wayland_surface *w, struct yasl_vector2i pos,
                          int button, int lines, float delta)
 {
     push_mouse(s, w, (struct yasl_mouse_event){
@@ -118,7 +118,7 @@ static void report_wheel(struct seat *s, struct yasl_surface *w, struct yasl_vec
     });
 }
 
-static bool cursor_theme_for(struct yasl_display *c, int scale)
+static bool cursor_theme_for(struct wayland_display *c, int scale)
 {
     if (c->cursor_theme && c->cursor_theme_scale == scale)
         return true;
@@ -135,7 +135,7 @@ static bool cursor_theme_for(struct yasl_display *c, int scale)
 
 static bool seat_cursor_surface(struct seat *s)
 {
-    struct yasl_display *c = s->conn;
+    struct wayland_display *c = s->conn;
     if (s->cursor_surface)
         return true;
     s->cursor_surface = wl_compositor_create_surface(c->compositor);
@@ -146,10 +146,10 @@ static bool seat_cursor_surface(struct seat *s)
     return true;
 }
 
-static void set_cursor_theme_fallback(struct seat *s, struct yasl_surface *w,
+static void set_cursor_theme_fallback(struct seat *s, struct wayland_surface *w,
                                       enum yasl_cursor shape)
 {
-    struct yasl_display *c = s->conn;
+    struct wayland_display *c = s->conn;
     int scale = (int)((w->scale_120 + YASL_SCALE_UNIT - 1) / YASL_SCALE_UNIT);
     if (scale < 1) scale = 1;
     if (!seat_cursor_surface(s) || !cursor_theme_for(c, scale)) return;
@@ -206,7 +206,7 @@ static uint32_t cursor_shape_of(enum yasl_cursor shape)
     }
 }
 
-static void seat_set_cursor(struct seat *s, struct yasl_surface *w, enum yasl_cursor shape)
+static void seat_set_cursor(struct seat *s, struct wayland_surface *w, enum yasl_cursor shape)
 {
     if (!s->pointer || !s->pointer_serial || s->pointer_focus != w ||
         s->cursor_shape == (int)shape)
@@ -232,7 +232,7 @@ static void tool_set_cursor(struct tablet_tool *t, enum yasl_cursor shape)
                                             cursor_shape_of(shape));
 }
 
-void yasl_surface_set_cursor(struct yasl_surface *w, enum yasl_cursor shape)
+void wayland_surface_set_cursor(struct wayland_surface *w, enum yasl_cursor shape)
 {
     if (!w || !w->conn) return;
     for (struct seat *s = w->conn->seats; s; s = s->next) {
@@ -243,7 +243,7 @@ void yasl_surface_set_cursor(struct yasl_surface *w, enum yasl_cursor shape)
 }
 
 static void press_queue_flush(struct seat *s, struct press_queue *q,
-                              struct yasl_surface *only, uint64_t *buttons,
+                              struct wayland_surface *only, uint64_t *buttons,
                               struct yasl_mouse_event like)
 {
     int kept = 0;
@@ -265,7 +265,7 @@ static void press_queue_flush(struct seat *s, struct press_queue *q,
     q->n = kept;
 }
 
-static void press_queue_push(struct press_queue *q, struct yasl_surface *w,
+static void press_queue_push(struct press_queue *q, struct wayland_surface *w,
                              struct yasl_vector2i pos, int button, bool release)
 {
     if (q->n == (int)(sizeof(q->ev) / sizeof(q->ev[0]))) {
@@ -277,7 +277,7 @@ static void press_queue_push(struct press_queue *q, struct yasl_surface *w,
     };
 }
 
-static void press_queue_forget(struct press_queue *q, struct yasl_surface *w)
+static void press_queue_forget(struct press_queue *q, struct wayland_surface *w)
 {
     for (int i = 0; i < q->n; i++)
         if (q->ev[i].surface == w)
@@ -306,7 +306,7 @@ static void pointer_event_done(struct seat *s)
         pointer_frame(s, s->pointer);
 }
 
-static void flush_pending_motion(struct seat *s, struct yasl_surface *w)
+static void flush_pending_motion(struct seat *s, struct wayland_surface *w)
 {
     if (!s->motion_pending) return;
     s->motion_pending = false;
@@ -319,7 +319,7 @@ static void pointer_enter(void *data, struct wl_pointer *pointer,
 {
     (void)pointer;
     struct seat *s = data;
-    struct yasl_surface *w = conn_surface_for(s->conn, surface);
+    struct wayland_surface *w = conn_surface_for(s->conn, surface);
     s->pointer_focus = w;
     if (!w) return;
     s->pointer_pos = device_from_fixed(w, surface_x, surface_y);
@@ -335,7 +335,7 @@ static void pointer_leave(void *data, struct wl_pointer *pointer,
 {
     (void)pointer; (void)serial; (void)surface;
     struct seat *s = data;
-    struct yasl_surface *w = s->pointer_focus;
+    struct wayland_surface *w = s->pointer_focus;
     s->pointer_focus = NULL;
     if (!w) return;
     if (s->ptr_left)
@@ -352,7 +352,7 @@ static void pointer_motion(void *data, struct wl_pointer *pointer,
 {
     (void)pointer; (void)time;
     struct seat *s = data;
-    struct yasl_surface *w = s->pointer_focus;
+    struct wayland_surface *w = s->pointer_focus;
     if (!w) return;
     s->pointer_pos = device_from_fixed(w, surface_x, surface_y);
     s->motion_pending = true;
@@ -364,7 +364,7 @@ static void pointer_button(void *data, struct wl_pointer *pointer,
 {
     (void)pointer; (void)time;
     struct seat *s = data;
-    struct yasl_surface *w = s->pointer_focus;
+    struct wayland_surface *w = s->pointer_focus;
     if (unlikely(!w)) return;
 
     static const int8_t btn_map[8] = {
@@ -381,7 +381,6 @@ static void pointer_button(void *data, struct wl_pointer *pointer,
     if (unlikely(idx >= 7)) return;
     int b = btn_map[idx];
     if (unlikely(b < 0)) return;
-
     seat_note_input(s, serial);
     bool release = (state == WL_POINTER_BUTTON_STATE_RELEASED);
     if (!release) {
@@ -443,7 +442,7 @@ static void pointer_axis_value120(void *data, struct wl_pointer *pointer, uint32
     }
 }
 
-static void pointer_frame_vertical(struct seat *s, struct yasl_surface *w)
+static void pointer_frame_vertical(struct seat *s, struct wayland_surface *w)
 {
     if (s->axis_has_v120_v) {
         int discrete = s->axis_value120_v / 120;
@@ -466,7 +465,7 @@ static void pointer_frame_vertical(struct seat *s, struct yasl_surface *w)
     s->frame_v120 = 0;
 }
 
-static void pointer_frame_horizontal(struct seat *s, struct yasl_surface *w)
+static void pointer_frame_horizontal(struct seat *s, struct wayland_surface *w)
 {
     if (s->axis_has_v120_h) {
         int discrete = s->axis_value120_h / 120;
@@ -490,7 +489,7 @@ static void pointer_frame(void *data, struct wl_pointer *pointer)
 {
     (void)pointer;
     struct seat *s = data;
-    struct yasl_surface *left = s->ptr_left;
+    struct wayland_surface *left = s->ptr_left;
     if (left) {
         s->ptr_left = NULL;
         if (s->ptr_left_motion)
@@ -507,7 +506,7 @@ static void pointer_frame(void *data, struct wl_pointer *pointer)
         s->pointer_serial = serial;
         s->cursor_shape = shape;
     }
-    struct yasl_surface *w = s->pointer_focus;
+    struct wayland_surface *w = s->pointer_focus;
     if (!w) {
         s->ptr_presses.n = 0;
         return;
@@ -575,7 +574,7 @@ static int touch_count(const struct seat *s)
     return n;
 }
 
-static double touch_centroid_y(const struct seat *s, const struct yasl_surface *on)
+static double touch_centroid_y(const struct seat *s, const struct wayland_surface *on)
 {
     double sum = 0;
     int n = 0;
@@ -604,7 +603,7 @@ static void touch_down(void *data, struct wl_touch *touch,
 {
     (void)touch; (void)time;
     struct seat *s = data;
-    struct yasl_surface *w = conn_surface_for(s->conn, surface);
+    struct wayland_surface *w = conn_surface_for(s->conn, surface);
     if (!w || touch_find(s, id)) return;
     struct touch_point *p = NULL;
     for (int i = 0; i < SEAT_TOUCH_POINTS && !p; i++)
@@ -732,7 +731,7 @@ static void tablet_tool_proximity_in(void *data,
     (void)tool; (void)tablet;
     struct tablet_tool *t = data;
     struct seat *s = t->seat;
-    struct yasl_surface *w = conn_surface_for(s->conn, surface);
+    struct wayland_surface *w = conn_surface_for(s->conn, surface);
     s->tablet_focus = w;
     s->tool = t;
     s->tool_buttons = 0;
@@ -751,7 +750,7 @@ static void tablet_tool_proximity_out(void *data, struct zwp_tablet_tool_v2 *too
     (void)tool;
     struct tablet_tool *t = data;
     struct seat *s = t->seat;
-    struct yasl_surface *w = s->tablet_focus;
+    struct wayland_surface *w = s->tablet_focus;
     if (w) {
         press_queue_flush(s, &s->tool_presses, NULL, &s->tool_buttons, tool_event(s));
         struct yasl_mouse_event ev = tool_event(s);
@@ -771,7 +770,7 @@ static void tablet_tool_down(void *data, struct zwp_tablet_tool_v2 *tool, uint32
 {
     (void)tool;
     struct seat *s = ((struct tablet_tool *)data)->seat;
-    struct yasl_surface *w = s->tablet_focus;
+    struct wayland_surface *w = s->tablet_focus;
     if (!w) return;
     seat_note_input(s, serial);
     s->press_serial = serial;
@@ -783,7 +782,7 @@ static void tablet_tool_up(void *data, struct zwp_tablet_tool_v2 *tool)
 {
     (void)tool;
     struct seat *s = ((struct tablet_tool *)data)->seat;
-    struct yasl_surface *w = s->tablet_focus;
+    struct wayland_surface *w = s->tablet_focus;
     if (!w) return;
     s->pen.pressure = 0;
     press_queue_push(&s->tool_presses, w, s->tool_pos, 0, true);
@@ -793,7 +792,7 @@ static void tablet_tool_motion(void *data, struct zwp_tablet_tool_v2 *tool, wl_f
 {
     (void)tool;
     struct seat *s = ((struct tablet_tool *)data)->seat;
-    struct yasl_surface *w = s->tablet_focus;
+    struct wayland_surface *w = s->tablet_focus;
     if (!w) return;
     s->tool_pos = device_from_fixed(w, x, y);
     s->tool_motion = true;
@@ -804,7 +803,7 @@ static void tablet_tool_button(void *data, struct zwp_tablet_tool_v2 *tool,
 {
     (void)tool;
     struct seat *s = ((struct tablet_tool *)data)->seat;
-    struct yasl_surface *w = s->tablet_focus;
+    struct wayland_surface *w = s->tablet_focus;
     if (!w) return;
     seat_note_input(s, serial);
     int b;
@@ -851,7 +850,7 @@ static void tool_frame(void *d, struct zwp_tablet_tool_v2 *t, uint32_t time)
 {
     (void)t; (void)time;
     struct seat *s = ((struct tablet_tool *)d)->seat;
-    struct yasl_surface *w = s->tablet_focus;
+    struct wayland_surface *w = s->tablet_focus;
     if (!w) {
         s->tool_presses.n = 0;
         s->tool_wheel = 0;
@@ -1032,13 +1031,13 @@ static void clipboard_received(const char *text, size_t len, bool uri_list,
                              struct wl_surface *on, void *ud)
 {
     struct seat *s = ud;
-    struct yasl_display *c = s->conn;
-    struct yasl_surface *w = on ? surface_root(conn_surface_for(c, on)) : NULL;
+    struct wayland_display *c = s->conn;
+    struct wayland_surface *w = on ? surface_root(conn_surface_for(c, on)) : NULL;
     if (!w)
         w = c->paste_target ? c->paste_target : s->keyboard_focus;
     if (!len || !w) return;
     struct yasl_input_event ev = {
-        .surface = w,
+        .surface = &w->base,
         .kind = uri_list ? YASL_INPUT_DROP_FILES : YASL_INPUT_PASTE,
     };
     if (uri_list) {
@@ -1067,7 +1066,7 @@ static void clipboard_drop_hover(enum yasl_drop_event ev, struct wl_surface *on,
 
 void seat_clipboard_ensure(struct seat *s)
 {
-    struct yasl_display *c = s->conn;
+    struct wayland_display *c = s->conn;
     if (!c->data_manager || !s->proxy)
         return;
     if (!s->clipboard) {
@@ -1111,7 +1110,7 @@ static void seat_drop_keyboard(struct seat *s)
         s->keyboard = NULL;
     }
     s->repeat_rate = 0;
-    struct yasl_surface *w = s->keyboard_focus;
+    struct wayland_surface *w = s->keyboard_focus;
     s->keyboard_focus = NULL;
     if (w && !s->focus_leaving)
         s->focus_leaving = w;
@@ -1132,7 +1131,7 @@ static void seat_drop_touch(struct seat *s)
 static void seat_capabilities(void *data, struct wl_seat *proxy, uint32_t caps)
 {
     struct seat *s = data;
-    struct yasl_display *c = s->conn;
+    struct wayland_display *c = s->conn;
     if (caps & WL_SEAT_CAPABILITY_KEYBOARD) {
         if (!s->keyboard) {
             s->keyboard = wl_seat_get_keyboard(proxy);
@@ -1194,7 +1193,7 @@ const struct wl_seat_listener seat_listener = {
     .name = seat_name,
 };
 
-void seat_bind(struct yasl_display *c, struct wl_registry *registry,
+void seat_bind(struct wayland_display *c, struct wl_registry *registry,
                uint32_t name, uint32_t version)
 {
     struct seat *s = calloc(1, sizeof(*s));
@@ -1215,9 +1214,9 @@ void seat_bind(struct yasl_display *c, struct wl_registry *registry,
     keyboard_repeat_init(s);
 }
 
-void seat_forget_surface(struct seat *s, struct yasl_surface *w)
+void seat_forget_surface(struct seat *s, struct wayland_surface *w)
 {
-    struct yasl_surface **refs[] = {
+    struct wayland_surface **refs[] = {
         &s->pointer_focus, &s->keyboard_focus,
         &s->tablet_focus, &s->ime_focus, &s->focus_leaving, &s->ptr_left,
         &s->press_surface,
@@ -1240,7 +1239,7 @@ void seat_forget_surface(struct seat *s, struct yasl_surface *w)
 
 void seat_destroy(struct seat *s)
 {
-    struct yasl_display *c = s->conn;
+    struct wayland_display *c = s->conn;
     for (struct seat **link = &c->seats; *link; link = &(*link)->next) {
         if (*link == s) {
             *link = s->next;
@@ -1249,7 +1248,7 @@ void seat_destroy(struct seat *s)
     }
     if (c->active_seat == s)
         c->active_seat = NULL;
-    for (struct yasl_surface *w = c->surfaces; w; w = w->conn_next) {
+    for (struct wayland_surface *w = c->surfaces; w; w = w->conn_next) {
         if (w->ime_seat == s) {
             w->ime_seat = NULL;
             ime_reset(w);
@@ -1262,11 +1261,11 @@ void seat_destroy(struct seat *s)
     seat_destroy_tablet(s);
     seat_drop_pointer(s);
     seat_drop_keyboard(s);
-    struct yasl_surface *left = s->focus_leaving;
+    struct wayland_surface *left = s->focus_leaving;
     if (left && !conn_keyboard_on(c, left, NULL)) {
         struct yasl_input_event ev = {
             .kind = YASL_INPUT_FOCUS,
-            .surface = left,
+            .surface = &left->base,
             .focus = { .focused = false },
         };
         input_queue_push(&left->input, &ev);
@@ -1288,7 +1287,7 @@ void seat_destroy(struct seat *s)
     free(s);
 }
 
-bool seat_remove(struct yasl_display *c, uint32_t name)
+bool seat_remove(struct wayland_display *c, uint32_t name)
 {
     for (struct seat *s = c->seats; s; s = s->next) {
         if (s->name == name) {
@@ -1299,7 +1298,7 @@ bool seat_remove(struct yasl_display *c, uint32_t name)
     return false;
 }
 
-int display_input_init(struct yasl_display *c)
+int display_input_init(struct wayland_display *c)
 {
     for (struct seat *s = c->seats; s; s = s->next) {
         keyboard_repeat_init(s);
@@ -1308,7 +1307,7 @@ int display_input_init(struct yasl_display *c)
     return 0;
 }
 
-void surface_init_cursor(struct yasl_display *c)
+void surface_init_cursor(struct wayland_display *c)
 {
     if (c->cursor_shape_mgr)
         return;