Add C++20 RAII wrapper around wlroots 0.20 + scenefx
Wraps wlroots' C ABI behind owning types (Display, Backend, Compositor, Output, XdgShell/Toplevel, Seat/Cursor/Keyboard, Scene/Node/Tree) with wl_signal -> std::function callbacks. Links the scenefx effect engine and ships a wlr::fx animation helper. Includes a runnable tinywl-style compositor and a scene/blur demo. License: AGPL-3.0-only.
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AstralZX
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// SPDX-License-Identifier: AGPL-3.0-only
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#include <cstdio>
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#include <vector>
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#include <string>
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#include <algorithm>
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#include <ctime>
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#include <xkbcommon/xkbcommon.h>
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#include <wayland-server-core.h>
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#include "wlr/display.hpp"
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#include "wlr/backend.hpp"
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#include "wlr/compositor.hpp"
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#include "wlr/output.hpp"
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#include "wlr/xdg_shell.hpp"
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#include "wlr/seat.hpp"
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#include "wlr/scene.hpp"
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#include "wlr/node.hpp"
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struct FrameScheduler {
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wl_event_source* source = nullptr;
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struct wlr_scene* scene = nullptr;
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std::vector<struct wlr_scene_output*>* outputs = nullptr;
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};
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static void commit_outputs(FrameScheduler* s) {
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for (struct wlr_scene_output* so : *s->outputs)
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wlr_scene_output_commit(so, nullptr);
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}
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static int frame_tick(void* data) {
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FrameScheduler* s = static_cast<FrameScheduler*>(data);
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commit_outputs(s);
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wl_event_source_timer_update(s->source, 16);
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return 0;
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}
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struct ToplevelState {
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wlr::XdgSurface xdg;
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wlr::Tree scene_tree;
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bool mapped = false;
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std::string title;
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};
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int main() {
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wlr::Display display;
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if (!display)
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return 1;
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const char* socket = display.add_socket_auto();
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if (!socket)
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return 1;
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fprintf(stderr, "tinywl: WAYLAND_DISPLAY=%s\n", socket);
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fflush(stderr);
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wlr::Backend backend(display);
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if (!backend)
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return 1;
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wlr::Renderer renderer(wlr_renderer_autocreate(backend.raw()));
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if (!renderer)
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return 1;
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if (!renderer.init_wl_display(display))
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return 1;
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wlr::Allocator allocator(wlr_allocator_autocreate(backend.raw(), renderer.raw()));
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if (!allocator)
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return 1;
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wlr::Compositor compositor(display, renderer);
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if (!compositor)
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return 1;
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wlr::XdgShell xdg_shell(display);
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if (!xdg_shell)
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return 1;
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wlr::DataDeviceManager data_device_manager(wlr_data_device_manager_create(display.raw()));
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(void)data_device_manager;
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wlr::Seat seat(display, "seat0");
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if (!seat)
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return 1;
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wlr::Cursor cursor;
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if (!cursor)
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return 1;
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wlr::OutputLayout layout(display);
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if (!layout)
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return 1;
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cursor.attach_output_layout(layout.raw());
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wlr::Scene scene;
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scene.set_blur_radius(14);
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scene.set_blur_num_passes(2);
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scene.set_blur_noise(0.0f);
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scene.set_blur_brightness(1.0f);
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scene.set_blur_contrast(1.0f);
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scene.set_blur_saturation(1.0f);
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wlr::Tree toplevels(wlr_scene_tree_create(scene.root()));
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if (!toplevels)
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return 1;
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std::vector<struct wlr_scene_output*> outputs;
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std::vector<ToplevelState*> toplevel_nodes;
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FrameScheduler scheduler;
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scheduler.scene = scene.raw();
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scheduler.outputs = &outputs;
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scheduler.source = wl_event_loop_add_timer(display.event_loop(), frame_tick, &scheduler);
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backend.on_new_output([&](void* data) {
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struct wlr_output* o = static_cast<struct wlr_output*>(data);
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wlr::Output out(o);
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out.set_preferred_mode();
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wlr_output_init_render(o, allocator.raw(), renderer.raw());
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wlr_output_create_global(o, display.raw());
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struct wlr_scene_output* so = wlr_scene_output_create(scene.raw(), o);
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wlr_scene_output_set_position(so, 0, 0);
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outputs.push_back(so);
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layout.add_auto_output(o);
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wl_event_source_timer_update(scheduler.source, 0);
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});
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backend.on_new_input([&](void* data) {
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struct wlr_input_device* device = static_cast<struct wlr_input_device*>(data);
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cursor.attach_input_device(device);
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if (device->type != WLR_INPUT_DEVICE_KEYBOARD)
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return;
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struct wlr_keyboard* kb = wlr_keyboard_from_input_device(device);
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wlr::Keyboard k(kb);
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k.set_default_keymap();
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seat.set_keyboard(k);
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seat.set_capabilities(WL_SEAT_CAPABILITY_POINTER | WL_SEAT_CAPABILITY_KEYBOARD);
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});
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int toplevel_count = 0;
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xdg_shell.on_new_toplevel([&](void* data) {
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struct wlr_xdg_toplevel* t = static_cast<struct wlr_xdg_toplevel*>(data);
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wl_event_loop_add_idle(display.event_loop(),
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[](void* data) {
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auto* s = static_cast<struct wlr_xdg_surface*>(data);
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if (s->initialized)
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wlr_xdg_surface_schedule_configure(s);
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}, t->base);
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ToplevelState* tn = new ToplevelState{
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wlr::XdgSurface{t->base},
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wlr::Tree(wlr_scene_xdg_surface_create(toplevels.raw(), t->base)),
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};
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toplevel_nodes.push_back(tn);
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tn->xdg.on_map([&, tn](void*) {
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struct wlr_box lb = layout.box();
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int w = lb.width > 80 ? lb.width - 80 : 40;
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int h = lb.height > 80 ? lb.height - 80 : 40;
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int x = lb.x + 40 + (toplevel_count * 24) % w;
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int y = lb.y + 40 + (toplevel_count * 24) % h;
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toplevel_count++;
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tn->scene_tree.set_position(x, y);
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tn->scene_tree.raise_to_top();
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tn->mapped = true;
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});
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tn->xdg.on_unmap([tn](void*) {
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tn->mapped = false;
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});
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tn->xdg.on_destroy([&, tn](void*) {
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if (tn->scene_tree)
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wlr_scene_node_destroy(&tn->scene_tree.raw()->node);
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auto it = std::find(toplevel_nodes.begin(), toplevel_nodes.end(), tn);
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if (it != toplevel_nodes.end())
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toplevel_nodes.erase(it);
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delete tn;
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});
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wlr::Toplevel toplevel(t);
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toplevel.on_set_title([tn](void* d) {
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const char* s = static_cast<struct wlr_xdg_toplevel*>(d)->title;
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tn->title = s ? s : "";
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});
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toplevel.on_set_app_id([](void*) {});
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toplevel.on_request_maximize([&, tn, t](void* d) {
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auto* e = static_cast<struct wlr_xdg_toplevel_requested*>(d);
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wlr::Toplevel{t}.set_maximized(e->maximized);
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struct wlr_box lb = layout.box();
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tn->scene_tree.set_position(lb.x, lb.y);
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tn->scene_tree.set_enabled(true);
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});
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toplevel.on_request_minimize([&, tn, t](void* d) {
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auto* e = static_cast<struct wlr_xdg_toplevel_requested*>(d);
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tn->scene_tree.set_enabled(!e->minimized);
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});
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toplevel.on_request_fullscreen([&, tn, t](void* d) {
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auto* e = static_cast<struct wlr_xdg_toplevel_requested*>(d);
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wlr::Toplevel{t}.set_maximized(e->fullscreen);
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struct wlr_box lb = layout.box();
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tn->scene_tree.set_position(lb.x, lb.y);
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tn->scene_tree.set_enabled(true);
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});
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toplevel.on_request_move([](void*) {});
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toplevel.on_request_resize([](void*) {});
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});
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if (!backend.start())
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return 1;
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display.run();
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for (ToplevelState* tn : toplevel_nodes)
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delete tn;
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return 0;
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}
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