Initial Wayland support

Signed-off-by: Slendi <slendi@socopon.com>

flake.nix

@@ -23,6 +23,7 @@
           pkg-config
           glslang
           shaderc
+          wayland-scanner
         ];
         buildInputs = with pkgs; [
           vulkan-loader

meson.build

@@ -1,4 +1,4 @@
-project('vr-compositor', 'cpp',
+project('vr-compositor', 'c', 'cpp',
 	version: '0.1',
 	default_options: [
 		'cpp_std=c++26',
@@ -17,14 +17,32 @@ fastgltf_opts.set_override_option('werror', 'false')
 fastgltf = cmake.subproject('fastgltf', options: fastgltf_opts)
 
 cc = meson.get_compiler('cpp')
+wl_mod = import('wayland')
 
 wayland_dep = dependency('wayland-server', include_type: 'system')
+wayland_client_dep = dependency('wayland-client', include_type: 'system')
 vulkan_dep = dependency('vulkan', include_type: 'system')
 openxr_dep = dependency('openxr', include_type: 'system')
 zlib_dep = dependency('zlib', include_type: 'system')
 sdl3_dep = dependency('sdl3', include_type: 'system')
 libinput_dep = dependency('libinput', include_type: 'system')
 libudev_dep = dependency('libudev', include_type: 'system')
+wayland_protocol = wl_mod.scan_xml(
+	'protocols/wayland.xml',
+	client: false,
+	server: true,
+)
+wayland_protocol_source = wayland_protocol[0]
+wayland_server_header = wayland_protocol[1]
+
+xdg_shell_protocol = wl_mod.scan_xml(
+	'protocols/xdg-shell.xml',
+	client: true,
+	server: true,
+)
+xdg_shell_protocol_source = xdg_shell_protocol[0]
+xdg_shell_client_header = xdg_shell_protocol[1]
+xdg_shell_server_header = xdg_shell_protocol[2]
 imgui_src = files(
 	'thirdparty/imgui/imgui.cpp',
 	'thirdparty/imgui/imgui_draw.cpp',
@@ -161,12 +179,24 @@ exe = executable('vr-compositor',
 		'src/Loader.cpp',
 		'src/DescriptorWriter.cpp',
 		'src/CPUTexture.cpp',
+		'src/wayland/WaylandServer.cpp',
+		'src/wayland/Surface.cpp',
+		'src/wayland/Shm.cpp',
+		'src/wayland/protocols/CompositorProtocol.cpp',
+		'src/wayland/protocols/ShmProtocol.cpp',
+		'src/wayland/protocols/XdgShellProtocol.cpp',
 		'src/Skybox.cpp',
 		'src/VulkanRenderer.cpp',
 		'src/Application.cpp',
+		wayland_protocol_source,
+		xdg_shell_protocol_source,
+		wayland_server_header,
+		xdg_shell_server_header,
 	],
+	c_args: ['-Wno-missing-variable-declarations'],
 	include_directories: [
 		vkbootstrap_inc,
+		include_directories('.'),
 		imgui_inc,
 		'thirdparty/smath/include'
 	],
@@ -176,3 +206,11 @@ exe = executable('vr-compositor',
 		'--embed-dir=' + join_paths(meson.project_build_root(), 'shaders'),
 	],
 )
+
+executable('shm-life',
+	'tools/shm_life.cpp',
+	dependencies: [wayland_client_dep],
+	sources: [xdg_shell_protocol_source, xdg_shell_client_header],
+	c_args: ['-Wno-missing-variable-declarations'],
+	cpp_args: ['-Wno-cast-qual'],
+)

src/Application.h

@@ -3,16 +3,22 @@
 #include <array>
 #include <cstdint>
 #include <filesystem>
+#include <functional>
 #include <memory>
+#include <vector>
 
 #include <SDL3/SDL_video.h>
 #include <imgui.h>
 #include <linux/input-event-codes.h>
+#include <openxr/openxr.h>
+
+#include "smath.hpp"
 
 #include "Loader.h"
 #include "Logger.h"
 #include "Skybox.h"
 #include "Types.h"
+#include "wayland/Display.h"
 
 struct libinput;
 struct libinput_event_keyboard;
@@ -22,29 +28,63 @@ struct udev;
 namespace Lunar {
 
 struct VulkanRenderer;
+struct OpenXrState;
+namespace Wayland {
+struct WaylandServer;
+}
 
 struct Application {
-	Application();
-	~Application();
-
 	auto run() -> void;
 	auto binary_directory() const -> std::filesystem::path;
 
 	auto mouse_captured(bool new_state) -> void;
 	auto mouse_captured() const -> bool { return m_mouse_captured; }
 	auto toggle_mouse_captured() -> void { mouse_captured(!m_mouse_captured); }
+	auto is_key_down(uint32_t key) const -> bool;
+	auto is_key_up(uint32_t key) const -> bool;
 	auto is_key_pressed(uint32_t key) const -> bool;
+	auto is_key_released(uint32_t key) const -> bool;
+
+	static auto the() -> Application &;
 
 private:
+	enum class Backend {
+		SDL,
+		KMS,
+	};
+
+	Application();
+	~Application();
+
 	auto init_input() -> void;
 	auto init_test_meshes() -> void;
+	auto init_wayland() -> void;
 	auto asset_directory() -> std::filesystem::path;
 	auto shutdown_input() -> void;
 	auto process_libinput_events() -> void;
 	auto handle_keyboard_event(libinput_event_keyboard *event) -> void;
+	auto handle_pointer_motion(libinput_event_pointer *event) -> void;
+	auto handle_pointer_button(libinput_event_pointer *event) -> void;
+	auto handle_pointer_axis(libinput_event_pointer *event) -> void;
+	auto handle_pointer_frame() -> void;
+	auto handle_pointer_end_frame() -> void;
+	auto handle_pointer_cancel() -> void;
+	auto handle_keyboard_key(std::optional<uint32_t> key, bool pressed) -> void;
 	auto clamp_mouse_to_window(int width, int height) -> void;
+	auto init_openxr() -> void;
+	auto init_openxr_session() -> void;
+	auto shutdown_openxr() -> void;
+	auto poll_openxr_events() -> void;
+	auto render_openxr_frame(
+	    std::function<void(VulkanRenderer::GL &)> const &record,
+	    float dt_seconds) -> bool;
+	auto update_camera_from_xr_view(XrView const &view) -> void;
+	auto update_hands(XrTime display_time) -> void;
+	auto render_hands(
+	    VulkanRenderer::GL &gl, smath::Mat4 const &view_projection) -> void;
 
 	SDL_Window *m_window { nullptr };
+	Backend m_backend { Backend::SDL };
 	Logger m_logger { "Lunar" };
 	std::unique_ptr<VulkanRenderer> m_renderer;
 	Skybox m_skybox;
@@ -53,9 +93,13 @@ private:
 	udev *m_udev { nullptr };
 	libinput *m_libinput { nullptr };
 
+	std::unique_ptr<OpenXrState> m_openxr {};
+	std::unique_ptr<Wayland::WaylandServer> m_wayland {};
+
 	bool m_running { true };
 	bool m_mouse_captured { false };
 	bool m_show_imgui { false };
+	bool m_window_focused { true };
 	int m_ctrl_pressed_count { 0 };
 	std::uint32_t m_screenshot_index { 0 };
 
@@ -66,9 +110,17 @@ private:
 	float m_mouse_sensitivity { 0.001f };
 
 	std::array<bool, KEY_MAX + 1> m_key_state {};
+	std::array<bool, KEY_MAX + 1> m_key_state_previous {};
 
 	Camera m_camera;
 	PolarCoordinate m_cursor;
+
+	static inline std::array<smath::Vec3, XR_HAND_JOINT_COUNT_EXT>
+	    m_left_joints {};
+	static inline std::array<smath::Vec3, XR_HAND_JOINT_COUNT_EXT>
+	    m_right_joints {};
+	static inline bool m_left_hand_valid { false };
+	static inline bool m_right_hand_valid { false };
 };
 
 } // namespace Lunar

src/CPUTexture.cpp

@@ -59,11 +59,11 @@ namespace Lunar {
 
 CPUTexture::CPUTexture(std::filesystem::path const &path)
 {
-	int width_out = 0;
-	int height_out = 0;
-	int channels_out = 0;
-	stbi_uc *data = stbi_load(path.string().c_str(), &width_out, &height_out,
-	    &channels_out, STBI_rgb_alpha);
+	int width_out { 0 };
+	int height_out { 0 };
+	int channels_out { 0 };
+	stbi_uc *data { stbi_load(path.string().c_str(), &width_out, &height_out,
+		&channels_out, STBI_rgb_alpha) };
 	if (!data) {
 		throw std::runtime_error(
 		    std::format("Failed to load texture: {}", path.string()));
@@ -76,4 +76,13 @@ CPUTexture::CPUTexture(std::filesystem::path const &path)
 	stbi_image_free(data);
 }
 
+CPUTexture::CPUTexture(std::vector<uint8_t> pixels, uint32_t width,
+    uint32_t height, vk::Format format)
+    : pixels(std::move(pixels))
+    , width(width)
+    , height(height)
+    , format(format)
+{
+}
+
 } // namespace Lunar

src/CPUTexture.h

@@ -15,6 +15,8 @@ struct CPUTexture {
 	vk::Format format { vk::Format::eR8G8B8A8Unorm };
 
 	explicit CPUTexture(std::filesystem::path const &path);
+	CPUTexture(std::vector<uint8_t> pixels, uint32_t width, uint32_t height,
+	    vk::Format format);
 };
 
 } // namespace Lunar

src/DescriptorAllocatorGrowable.cpp

@@ -78,7 +78,7 @@ auto DescriptorAllocatorGrowable::destroy_pools(VkDevice dev) -> void
 auto DescriptorAllocatorGrowable::allocate(Logger &logger, VkDevice dev,
     VkDescriptorSetLayout layout, void *p_next) -> VkDescriptorSet
 {
-	auto pool_to_use = get_pool(dev);
+	auto pool_to_use { get_pool(dev) };
 
 	VkDescriptorSetAllocateInfo alloci {};
 	alloci.sType = VK_STRUCTURE_TYPE_DESCRIPTOR_SET_ALLOCATE_INFO;

src/Loader.cpp

@@ -61,7 +61,7 @@ auto Mesh::load_gltf_meshes(
 {
 	renderer.logger().debug("Loading GLTF from file: {}", path);
 
-	auto data = fastgltf::GltfDataBuffer::FromPath(path);
+	auto data { fastgltf::GltfDataBuffer::FromPath(path) };
 	if (data.error() != fastgltf::Error::None) {
 		renderer.logger().err("Failed to open glTF file: {} (error {})", path,
 		    fastgltf::to_underlying(data.error()));
@@ -98,7 +98,7 @@ auto Mesh::load_gltf_meshes(
 			new_surface.count = static_cast<uint32_t>(
 			    gltf.accessors[p.indicesAccessor.value()].count);
 
-			size_t initial_vertex = vertices.size();
+			size_t initial_vertex { vertices.size() };
 
 			{ // Indices
 				auto &accessor = gltf.accessors[p.indicesAccessor.value()];
@@ -128,7 +128,7 @@ auto Mesh::load_gltf_meshes(
 
 			if (auto attr = p.findAttribute("NORMAL")) { // Normals
 				auto &accessor = gltf.accessors[attr->accessorIndex];
-				size_t local_index = 0;
+				size_t local_index { 0 };
 				for (auto normal :
 				    fastgltf::iterateAccessor<smath::Vec3>(gltf, accessor)) {
 					vertices[initial_vertex + local_index].normal = normal;
@@ -138,7 +138,7 @@ auto Mesh::load_gltf_meshes(
 
 			if (auto attr = p.findAttribute("TEXCOORD_0")) { // UVs
 				auto &accessor = gltf.accessors[attr->accessorIndex];
-				size_t local_index = 0;
+				size_t local_index { 0 };
 				for (auto uv :
 				    fastgltf::iterateAccessor<smath::Vec2>(gltf, accessor)) {
 					uv.unpack(vertices[initial_vertex + local_index].u,
@@ -149,7 +149,7 @@ auto Mesh::load_gltf_meshes(
 
 			if (auto attr = p.findAttribute("COLOR_0")) { // Colors
 				auto &accessor = gltf.accessors[attr->accessorIndex];
-				size_t local_index = 0;
+				size_t local_index { 0 };
 
 				switch (accessor.type) {
 				case fastgltf::AccessorType::Vec3: {

src/Logger.cpp

@@ -34,7 +34,7 @@
 static std::filesystem::path get_log_path(std::string_view app_name)
 {
 #ifdef _WIN32
-	PWSTR path = nullptr;
+	PWSTR path { nullptr };
 	SHGetKnownFolderPath(FOLDERID_LocalAppData, 0, nullptr, &path);
 	std::wstring wpath(path);
 	CoTaskMemFree(path);
@@ -70,7 +70,7 @@ static int compress_file(std::filesystem::path const &input_path,
 	std::vector<char> buffer(chunk_size);
 	while (in) {
 		in.read(buffer.data(), static_cast<std::streamsize>(buffer.size()));
-		std::streamsize bytes = in.gcount();
+		std::streamsize bytes { in.gcount() };
 		if (bytes > 0)
 			gzwrite(out, buffer.data(), static_cast<unsigned int>(bytes));
 	}
@@ -99,20 +99,20 @@ Logger::Logger(std::string_view app_name)
 		if (!file.is_regular_file())
 			continue;
 
-		auto name = file.path().filename().stem().string();
+		auto name { file.path().filename().stem().string() };
 		constexpr std::string_view prefix = "log_";
 
 		if (name.rfind(prefix, 0) != 0) {
 			continue;
 		}
 
-		int v = std::stoi(name.substr(prefix.size()));
+		int v { std::stoi(name.substr(prefix.size())) };
 		if (v > max)
 			max = v;
 
-		auto ext = file.path().filename().extension().string();
+		auto ext { file.path().filename().extension().string() };
 		if (ext == ".txt") {
-			auto np = file.path();
+			auto np { file.path() };
 			np.replace_extension(ext + ".gz");
 			compress_file(file.path(), np);
 		}
@@ -153,7 +153,7 @@ static std::string get_current_time_string()
 
 void Logger::log(Level level, std::string_view msg)
 {
-	auto time_str = get_current_time_string();
+	auto time_str { get_current_time_string() };
 	std::string level_str;
 	switch (level) {
 	case Logger::Level::Debug:

src/Pipeline.cpp

@@ -27,13 +27,13 @@ auto Pipeline::Builder::set_push_constant_ranges(
 auto Pipeline::Builder::build_compute(
     vk::PipelineShaderStageCreateInfo const &stage) -> Pipeline
 {
-	auto pipeline_layout = build_layout();
+	auto pipeline_layout { build_layout() };
 
 	vk::ComputePipelineCreateInfo pipeline_ci {};
 	pipeline_ci.layout = pipeline_layout.get();
 	pipeline_ci.stage = stage;
 
-	auto pipeline_ret = m_device.createComputePipelineUnique({}, pipeline_ci);
+	auto pipeline_ret { m_device.createComputePipelineUnique({}, pipeline_ci) };
 	VK_CHECK(m_logger, pipeline_ret.result);
 
 	return Pipeline {
@@ -46,14 +46,14 @@ auto Pipeline::Builder::build_graphics(
     std::function<GraphicsPipelineBuilder &(GraphicsPipelineBuilder &)> const
         &configure) -> Pipeline
 {
-	auto pipeline_layout = build_layout();
+	auto pipeline_layout { build_layout() };
 
-	auto builder = GraphicsPipelineBuilder { m_logger };
+	auto builder { GraphicsPipelineBuilder { m_logger } };
 	builder.set_pipeline_layout(
 	    static_cast<VkPipelineLayout>(pipeline_layout.get()));
 	configure(builder);
 
-	auto pipeline_handle = builder.build(static_cast<VkDevice>(m_device));
+	auto pipeline_handle { builder.build(static_cast<VkDevice>(m_device)) };
 	vk::UniquePipeline pipeline_unique(pipeline_handle,
 	    vk::detail::ObjectDestroy<vk::Device,
 	        VULKAN_HPP_DEFAULT_DISPATCHER_TYPE>(m_device));

src/Skybox.cpp

@@ -23,7 +23,7 @@ struct FaceOffset {
 	uint32_t y;
 };
 
-constexpr std::array<FaceOffset, 6> kCrossOffsets {
+constexpr std::array<FaceOffset, 6> CROSS_OFFSETS {
 	FaceOffset { 2, 1 }, // +X
 	FaceOffset { 0, 1 }, // -X
 	FaceOffset { 1, 0 }, // +Y
@@ -34,6 +34,83 @@ constexpr std::array<FaceOffset, 6> kCrossOffsets {
 
 } // namespace
 
+auto Skybox::rebuild_pipeline(VulkanRenderer &renderer) -> bool
+{
+	Pipeline::Builder pipeline_builder { renderer.device(), renderer.logger() };
+
+	uint8_t skybox_vert_shader_data[] {
+#embed "skybox_vert.spv"
+	};
+	auto skybox_vert_shader
+	    = vkutil::load_shader_module(std::span<uint8_t>(skybox_vert_shader_data,
+	                                     sizeof(skybox_vert_shader_data)),
+	        renderer.device());
+	if (!skybox_vert_shader) {
+		renderer.logger().err("Failed to load skybox vert shader");
+		return false;
+	}
+
+	uint8_t skybox_frag_shader_data[] {
+#embed "skybox_frag.spv"
+	};
+	auto skybox_frag_shader
+	    = vkutil::load_shader_module(std::span<uint8_t>(skybox_frag_shader_data,
+	                                     sizeof(skybox_frag_shader_data)),
+	        renderer.device());
+	if (!skybox_frag_shader) {
+		renderer.logger().err("Failed to load skybox frag shader");
+		return false;
+	}
+
+	vk::PushConstantRange push_constant_range {};
+	push_constant_range.stageFlags = vk::ShaderStageFlagBits::eVertex;
+	push_constant_range.offset = 0;
+	push_constant_range.size = sizeof(SkyboxPushConstants);
+
+	std::array push_constant_ranges { push_constant_range };
+	pipeline_builder.set_push_constant_ranges(push_constant_ranges);
+	std::array descriptor_set_layouts {
+		renderer.single_image_descriptor_layout()
+	};
+	pipeline_builder.set_descriptor_set_layouts(descriptor_set_layouts);
+
+	VkVertexInputBindingDescription binding {};
+	binding.binding = 0;
+	binding.stride = sizeof(Vertex);
+	binding.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;
+
+	VkVertexInputAttributeDescription attribute {};
+	attribute.location = 0;
+	attribute.binding = 0;
+	attribute.format = VK_FORMAT_R32G32B32_SFLOAT;
+	attribute.offset = offsetof(Vertex, position);
+
+	std::array bindings { binding };
+	std::array attributes { attribute };
+
+	m_pipeline = pipeline_builder.build_graphics(
+	    [&](GraphicsPipelineBuilder &builder) -> GraphicsPipelineBuilder & {
+		    builder.set_vertex_input(bindings, attributes);
+		    return builder
+		        .set_shaders(skybox_vert_shader.get(), skybox_frag_shader.get())
+		        .set_input_topology(VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST)
+		        .set_polygon_mode(VK_POLYGON_MODE_FILL)
+		        .set_cull_mode(
+		            VK_CULL_MODE_FRONT_BIT, VK_FRONT_FACE_COUNTER_CLOCKWISE)
+		        .set_multisampling(
+		            static_cast<VkSampleCountFlagBits>(renderer.msaa_samples()))
+		        .disable_blending()
+		        .enable_depth_testing(false, VK_COMPARE_OP_LESS_OR_EQUAL)
+		        .set_color_attachment_format(
+		            static_cast<VkFormat>(renderer.draw_image_format()))
+		        .set_depth_format(
+		            static_cast<VkFormat>(renderer.depth_image_format()));
+	    });
+
+	m_pipeline_samples = renderer.msaa_samples();
+	return true;
+}
+
 auto Skybox::init(VulkanRenderer &renderer, std::filesystem::path const &path)
     -> void
 {
@@ -61,10 +138,10 @@ auto Skybox::init(VulkanRenderer &renderer, std::filesystem::path const &path)
 	uint32_t const face_size = texture.width / 4;
 	size_t const face_bytes = static_cast<size_t>(face_size) * face_size * 4;
 
-	std::vector<uint8_t> cubemap_pixels(face_bytes * kCrossOffsets.size());
+	std::vector<uint8_t> cubemap_pixels(face_bytes * CROSS_OFFSETS.size());
 
-	for (size_t face = 0; face < kCrossOffsets.size(); ++face) {
-		auto const offset = kCrossOffsets[face];
+	for (size_t face = 0; face < CROSS_OFFSETS.size(); ++face) {
+		auto const offset = CROSS_OFFSETS[face];
 		for (uint32_t y = 0; y < face_size; ++y) {
 			for (uint32_t x = 0; x < face_size; ++x) {
 				uint32_t const src_x = offset.x * face_size + x;
@@ -108,7 +185,9 @@ auto Skybox::init(VulkanRenderer &renderer, std::filesystem::path const &path)
 	vk::DescriptorSetAllocateInfo alloc_info {};
 	alloc_info.descriptorPool = m_descriptor_pool.get();
 	alloc_info.descriptorSetCount = 1;
-	vk::DescriptorSetLayout layout = renderer.single_image_descriptor_layout();
+	vk::DescriptorSetLayout layout {
+		renderer.single_image_descriptor_layout()
+	};
 	alloc_info.pSetLayouts = &layout;
 	m_descriptor_set
 	    = renderer.device().allocateDescriptorSets(alloc_info).front();
@@ -183,79 +262,11 @@ auto Skybox::init(VulkanRenderer &renderer, std::filesystem::path const &path)
 	m_index_count = static_cast<uint32_t>(indices.size());
 	m_cube_mesh = renderer.upload_mesh(indices, vertices);
 
-	Pipeline::Builder pipeline_builder { renderer.device(), renderer.logger() };
-
-	uint8_t skybox_vert_shader_data[] {
-#embed "skybox_vert.spv"
-	};
-	auto skybox_vert_shader
-	    = vkutil::load_shader_module(std::span<uint8_t>(skybox_vert_shader_data,
-	                                     sizeof(skybox_vert_shader_data)),
-	        renderer.device());
-	if (!skybox_vert_shader) {
-		renderer.logger().err("Failed to load skybox vert shader");
+	if (!rebuild_pipeline(renderer)) {
 		ok = false;
 		return;
 	}
 
-	uint8_t skybox_frag_shader_data[] {
-#embed "skybox_frag.spv"
-	};
-	auto skybox_frag_shader
-	    = vkutil::load_shader_module(std::span<uint8_t>(skybox_frag_shader_data,
-	                                     sizeof(skybox_frag_shader_data)),
-	        renderer.device());
-	if (!skybox_frag_shader) {
-		renderer.logger().err("Failed to load skybox frag shader");
-		ok = false;
-		return;
-	}
-
-	vk::PushConstantRange push_constant_range {};
-	push_constant_range.stageFlags = vk::ShaderStageFlagBits::eVertex;
-	push_constant_range.offset = 0;
-	push_constant_range.size = sizeof(SkyboxPushConstants);
-
-	std::array push_constant_ranges { push_constant_range };
-	pipeline_builder.set_push_constant_ranges(push_constant_ranges);
-	std::array descriptor_set_layouts {
-		renderer.single_image_descriptor_layout()
-	};
-	pipeline_builder.set_descriptor_set_layouts(descriptor_set_layouts);
-
-	VkVertexInputBindingDescription binding {};
-	binding.binding = 0;
-	binding.stride = sizeof(Vertex);
-	binding.inputRate = VK_VERTEX_INPUT_RATE_VERTEX;
-
-	VkVertexInputAttributeDescription attribute {};
-	attribute.location = 0;
-	attribute.binding = 0;
-	attribute.format = VK_FORMAT_R32G32B32_SFLOAT;
-	attribute.offset = offsetof(Vertex, position);
-
-	std::array bindings { binding };
-	std::array attributes { attribute };
-
-	m_pipeline = pipeline_builder.build_graphics(
-	    [&](GraphicsPipelineBuilder &builder) -> GraphicsPipelineBuilder & {
-		    builder.set_vertex_input(bindings, attributes);
-		    return builder
-		        .set_shaders(skybox_vert_shader.get(), skybox_frag_shader.get())
-		        .set_input_topology(VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST)
-		        .set_polygon_mode(VK_POLYGON_MODE_FILL)
-		        .set_cull_mode(
-		            VK_CULL_MODE_FRONT_BIT, VK_FRONT_FACE_COUNTER_CLOCKWISE)
-		        .set_multisampling(
-		            static_cast<VkSampleCountFlagBits>(renderer.msaa_samples()))
-		        .disable_blending()
-		        .enable_depth_testing(false, VK_COMPARE_OP_LESS_OR_EQUAL)
-		        .set_color_attachment_format(
-		            static_cast<VkFormat>(renderer.draw_image_format()))
-		        .set_depth_format(
-		            static_cast<VkFormat>(renderer.depth_image_format()));
-	    });
-
 	ok = true;
 }
 
@@ -273,6 +284,7 @@ auto Skybox::destroy(VulkanRenderer &renderer) -> void
 	m_sampler.reset();
 	m_descriptor_pool.reset();
 	m_pipeline.reset();
+	m_pipeline_samples = vk::SampleCountFlagBits::e1;
 	m_descriptor_set = vk::DescriptorSet {};
 	m_cube_mesh = {};
 	m_cubemap = {};
@@ -280,14 +292,21 @@ auto Skybox::destroy(VulkanRenderer &renderer) -> void
 	ok = false;
 }
 
-auto Skybox::draw(VulkanRenderer::GL &gl, smath::Mat4 const &mvp) -> void
+auto Skybox::draw(VulkanRenderer::GL &gl, VulkanRenderer &renderer,
+    smath::Mat4 const &mvp) -> void
 {
 	if (!ok) {
 		return;
 	}
 
+	if (m_pipeline_samples != renderer.msaa_samples()) {
+		if (!rebuild_pipeline(renderer)) {
+			return;
+		}
+	}
+
 	SkyboxPushConstants push_constants { mvp };
-	auto bytes = std::as_bytes(std::span { &push_constants, 1 });
+	auto bytes { std::as_bytes(std::span { &push_constants, 1 }) };
 	gl.draw_indexed(m_pipeline, m_descriptor_set, m_cube_mesh.vertex_buffer,
 	    m_cube_mesh.index_buffer, m_index_count, bytes);
 }

src/Skybox.h

@@ -17,15 +17,19 @@ struct Skybox {
 	auto init(VulkanRenderer &renderer, std::filesystem::path const &path)
 	    -> void;
 	auto destroy(VulkanRenderer &renderer) -> void;
-	auto draw(VulkanRenderer::GL &gl, smath::Mat4 const &mvp) -> void;
+	auto draw(VulkanRenderer::GL &gl, VulkanRenderer &renderer,
+	    smath::Mat4 const &mvp) -> void;
 
 private:
+	auto rebuild_pipeline(VulkanRenderer &renderer) -> bool;
+
 	Pipeline m_pipeline {};
 	GPUMeshBuffers m_cube_mesh {};
 	AllocatedImage m_cubemap {};
 	vk::UniqueSampler m_sampler {};
 	vk::UniqueDescriptorPool m_descriptor_pool {};
 	vk::DescriptorSet m_descriptor_set {};
+	vk::SampleCountFlagBits m_pipeline_samples { vk::SampleCountFlagBits::e1 };
 	uint32_t m_index_count { 0 };
 };
 

src/Types.h

@@ -96,7 +96,7 @@ struct PolarCoordinate {
 
 	smath::Vec3 to_vec3() const
 	{
-		float sin_phi = std::sin(phi);
+		float sin_phi { std::sin(phi) };
 
 		return smath::Vec3 { r * sin_phi * std::cos(theta), r * std::cos(phi),
 			r * sin_phi * std::sin(theta) };

src/Util.h

@@ -29,7 +29,7 @@ template<typename F> privDefer<F> defer_func(F f) { return privDefer<F>(f); }
 #define VK_CHECK(logger, x) \
 	do { \
 		auto err { x }; \
-		auto result = vk::Result(err); \
+		auto result { vk::Result(err) }; \
 		if (result != vk::Result::eSuccess) { \
 			(logger).err("Detected Vulkan error: {}", vk::to_string(result)); \
 			throw std::runtime_error("Vulkan error"); \

src/VulkanRenderer.h

@@ -7,6 +7,7 @@
 #include <mutex>
 #include <optional>
 #include <span>
+#include <string>
 #include <variant>
 #include <vector>
 
@@ -130,11 +131,21 @@ struct VulkanRenderer {
 		MSAA_8X,
 	};
 
-	VulkanRenderer(SDL_Window *window, Logger &logger);
+	struct KmsSurfaceConfig { };
+
+	VulkanRenderer(SDL_Window *window, Logger &logger,
+	    std::span<std::string const> instance_extensions = {},
+	    std::span<std::string const> device_extensions = {});
+	VulkanRenderer(KmsSurfaceConfig config, Logger &logger,
+	    std::span<std::string const> instance_extensions = {},
+	    std::span<std::string const> device_extensions = {});
 	~VulkanRenderer();
 
 	auto render(std::function<void(GL &)> const &record = {}) -> void;
+	auto render_to_image(vk::Image target_image, vk::Extent2D target_extent,
+	    std::function<void(GL &)> const &record = {}) -> void;
 	auto resize(uint32_t width, uint32_t height) -> void;
+	auto set_offscreen_extent(vk::Extent2D extent) -> void;
 	auto set_antialiasing(AntiAliasingKind kind) -> void;
 	auto set_antialiasing_immediate(AntiAliasingKind kind) -> void;
 	auto antialiasing() const -> AntiAliasingKind
@@ -153,6 +164,7 @@ struct VulkanRenderer {
 	auto create_cubemap(std::span<uint8_t const> pixels, uint32_t face_size,
 	    vk::Format format, vk::ImageUsageFlags flags) -> AllocatedImage;
 	auto destroy_image(AllocatedImage const &img) -> void;
+	auto destroy_image_later(AllocatedImage img) -> void;
 	auto rectangle_mesh() const -> GPUMeshBuffers const &
 	{
 		return m_vk.rectangle;
@@ -175,8 +187,19 @@ struct VulkanRenderer {
 	}
 	auto draw_extent() const -> vk::Extent2D { return m_vk.draw_extent; }
 	auto mesh_pipeline() -> Pipeline & { return m_vk.mesh_pipeline; }
+	auto wayland_pipeline() -> Pipeline & { return m_vk.wayland_pipeline; }
 	auto triangle_pipeline() -> Pipeline & { return m_vk.triangle_pipeline; }
 	auto device() const -> vk::Device { return m_device; }
+	auto instance() const -> vk::Instance { return m_instance; }
+	auto physical_device() const -> vk::PhysicalDevice
+	{
+		return m_physical_device;
+	}
+	auto graphics_queue() const -> vk::Queue { return m_vk.graphics_queue; }
+	auto graphics_queue_family() const -> uint32_t
+	{
+		return m_vk.graphics_queue_family;
+	}
 	auto draw_image_format() const -> vk::Format
 	{
 		return m_vk.draw_image.format;
@@ -232,6 +255,7 @@ private:
 
 	auto vk_init() -> void;
 	auto swapchain_init() -> void;
+	auto setup_kms_surface() -> void;
 	auto commands_init() -> void;
 	auto sync_init() -> void;
 	auto descriptors_init() -> void;
@@ -337,6 +361,7 @@ private:
 		Pipeline triangle_pipeline_culled;
 		Pipeline mesh_pipeline;
 		Pipeline mesh_pipeline_culled;
+		Pipeline wayland_pipeline;
 
 		GPUMeshBuffers rectangle;
 
@@ -359,10 +384,27 @@ private:
 		vk::UniqueSampler default_sampler_nearest;
 	} m_vk;
 
+	struct KmsState {
+		vk::DisplayKHR display {};
+		vk::DisplayModeKHR mode {};
+		vk::Extent2D extent {};
+		uint32_t plane_index { 0 };
+		uint32_t plane_stack_index { 0 };
+		std::string display_name {};
+	};
+
 	SDL_Window *m_window { nullptr };
 	Logger &m_logger;
 	std::mutex m_command_mutex;
 	std::vector<RenderCommand> m_pending_render_commands;
+	bool m_use_kms { false };
+	bool m_imgui_enabled { true };
+	std::optional<KmsState> m_kms_state {};
+	vk::PhysicalDevice m_kms_physical_device {};
+	vk::Extent2D m_kms_extent {};
+	bool m_kms_physical_device_set { false };
+	std::vector<std::string> m_extra_instance_extensions {};
+	std::vector<std::string> m_extra_device_extensions {};
 };
 
 } // namespace Lunar

src/main.cpp

@@ -1,7 +1,3 @@
 #include "src/Application.h"
 
-auto main() -> int
-{
-	Lunar::Application app {};
-	app.run();
-}
+auto main() -> int { Lunar::Application::the().run(); }

src/wayland/Client.h

@@ -0,0 +1,113 @@
+#pragma once
+
+#include <cassert>
+#include <format>
+#include <functional>
+#include <optional>
+#include <tuple>
+
+#include <wayland-server-core.h>
+
+#include "Display.h"
+#include "List.h"
+
+namespace Lunar::Wayland {
+
+struct Client {
+	Client(wl_client *client)
+	    : m_client { std::move(client) }
+	{
+		assert(m_client);
+	}
+	~Client() = default;
+
+	inline auto c_ptr() const -> wl_client * { return m_client; }
+
+	static auto from_link(wl_list *link) -> Client
+	{
+		return Client { wl_client_from_link(link) };
+	}
+
+	auto flush() { wl_client_flush(m_client); }
+
+	auto get_display() -> Display
+	{
+		return Display { wl_client_get_display(m_client) };
+	}
+
+	auto get_credentials() noexcept -> std::tuple<pid_t, uid_t, gid_t>
+	{
+		std::tuple<pid_t, uid_t, gid_t> ret {};
+		auto &[pid, uid, gid] { ret };
+		wl_client_get_credentials(m_client, &pid, &uid, &gid);
+		return ret;
+	}
+
+	auto get_fd() noexcept -> int { return wl_client_get_fd(m_client); }
+
+	auto get_object(uint32_t id) -> std::optional<wl_resource *>
+	{
+		if (auto *res { wl_client_get_object(m_client, id) }; res != NULL) {
+			return res;
+		} else {
+			return {};
+		}
+	}
+
+	auto post_implementation_error(std::string_view string)
+	{
+		wl_client_post_implementation_error(
+		    m_client, "%.*s", static_cast<int>(string.size()), string.data());
+	}
+
+	template<typename... Args>
+	auto post_implementation_error(
+	    std::format_string<Args...> fmt, Args &&...args)
+	{
+		post_implementation_error(
+		    std::format(fmt, std::forward<Args>(args)...));
+	}
+
+	auto add_destroy_listener(wl_listener *listener)
+	{
+		wl_client_add_destroy_listener(m_client, listener);
+	}
+
+	auto add_destroy_late_listener(wl_listener *listener)
+	{
+		wl_client_add_destroy_late_listener(m_client, listener);
+	}
+
+	auto get_link() -> wl_list * { return wl_client_get_link(m_client); }
+
+	auto add_resource_created_listener(wl_listener *listener)
+	{
+		wl_client_add_resource_created_listener(m_client, listener);
+	}
+
+	auto for_each_resource(
+	    std::function<wl_iterator_result(wl_resource *)> const &fn) -> void
+	{
+		wl_client_for_each_resource(
+		    m_client,
+		    (wl_client_for_each_resource_iterator_func_t)[](
+		        wl_resource * res, void *user_data)
+		        ->wl_iterator_result {
+			        auto *f { static_cast<
+				        std::function<wl_iterator_result(wl_resource *)> *>(
+				        user_data) };
+			        return (*f)(res);
+		        },
+		    const_cast<void *>(static_cast<void const *>(&fn)));
+	}
+
+	auto set_max_buffer_size(size_t max_buffer_size)
+	{
+		wl_client_set_max_buffer_size(m_client, max_buffer_size);
+	}
+
+private:
+	wl_client *m_client {};
+};
+
+} // namespace Lunar::Wayland

src/wayland/Display.h

@@ -0,0 +1,103 @@
+#pragma once
+
+#include <cassert>
+#include <format>
+#include <stdexcept>
+#include <vector>
+
+#include <wayland-server-core.h>
+
+namespace Lunar::Wayland {
+
+struct Display {
+	Display()
+	    : m_display(wl_display_create())
+	{
+	}
+	Display(wl_display *display)
+	    : m_display { std::move(display) }
+	    , m_should_cleanup { false }
+	{
+	}
+	~Display()
+	{
+		if (!m_should_cleanup)
+			return;
+		wl_display_destroy_clients(m_display);
+		wl_display_destroy(m_display);
+	}
+
+	inline auto c_ptr() const -> wl_display * { return m_display; }
+
+	auto set_global_filter(
+	    wl_display_global_filter_func_t filter, void *data) noexcept
+	{
+		wl_display_set_global_filter(m_display, filter, data);
+	}
+
+	auto next_serial() noexcept -> uint32_t
+	{
+		return wl_display_next_serial(m_display);
+	}
+
+	auto set_default_max_buffer_size(size_t max_buffer_size) noexcept
+	{
+		wl_display_set_default_max_buffer_size(m_display, max_buffer_size);
+	}
+
+	auto add_socket_fd(int fd)
+	{
+		if (wl_display_add_socket_fd(m_display, fd) == -1) {
+			throw std::runtime_error(
+			    "Failed to add socket fd to Wayland display");
+		}
+	}
+
+	auto add_socket(char const *name)
+	{
+		if (wl_display_add_socket(m_display, name) == -1) {
+			throw std::runtime_error(std::format(
+			    "Failed to add socket `{}` to Wayland display", name));
+		}
+	}
+
+	auto add_protocol_logger(wl_protocol_logger_func_t func, void *user_data)
+	    -> wl_protocol_logger *
+	{
+		if (auto *logger {
+		        wl_display_add_protocol_logger(m_display, func, user_data) };
+		    logger != NULL) {
+			return logger;
+		} else {
+			throw std::runtime_error(
+			    "Failed to add protocol logger to Wayland display");
+		}
+	}
+
+	auto add_shm_format(uint32_t format) -> uint32_t *
+	{
+		if (auto *fmt { wl_display_add_shm_format(m_display, format) };
+		    fmt != NULL) {
+			return fmt;
+		} else {
+			throw std::runtime_error(
+			    "Failed to add SHM format to Wayland display");
+		}
+	}
+
+	auto get_client_list() -> std::vector<wl_client *>
+	{
+		std::vector<wl_client *> ret {};
+		auto const list { wl_display_get_client_list(m_display) };
+		assert(list);
+		wl_client *client {};
+		wl_client_for_each(client, list) { ret.push_back(client); }
+		return ret;
+	}
+
+private:
+	wl_display *m_display {};
+	bool m_should_cleanup { true };
+};
+
+} // namespace Lunar::Wayland

src/wayland/Global.h

@@ -0,0 +1,71 @@
+#pragma once
+
+#include <cassert>
+#include <optional>
+#include <utility>
+
+#include <wayland-server-core.h>
+
+#include "Client.h"
+#include "Display.h"
+
+namespace Lunar::Wayland {
+
+struct Global {
+	Global() = delete;
+
+	explicit Global(Display &display, wl_interface const *interface,
+	    int version, void *data, wl_global_bind_func_t bind)
+	    : m_global {
+		    wl_global_create(display.c_ptr(), interface, version, data, bind),
+	    }
+	{
+	}
+
+	Global(wl_global *global)
+	    : m_global { std::move(global) }
+	    , m_should_cleanup { false }
+	{
+		assert(m_global);
+	}
+
+	~Global()
+	{
+		if (!m_should_cleanup)
+			return;
+		wl_global_destroy(m_global);
+	}
+
+	inline auto c_ptr() const -> wl_global * { return m_global; }
+
+	auto get_name(Client &client) const -> std::optional<uint32_t>
+	{
+		if (auto const ret { wl_global_get_name(m_global, client.c_ptr()) };
+		    ret != 0) {
+			return ret;
+		} else {
+			return {};
+		}
+	}
+
+	inline auto get_version() const -> uint32_t
+	{
+		return wl_global_get_version(m_global);
+	}
+
+	inline auto get_display() const -> Display
+	{
+		return wl_global_get_display(m_global);
+	}
+
+	inline auto get_interface() const -> wl_interface const *
+	{
+		return wl_global_get_interface(m_global);
+	}
+
+private:
+	wl_global *m_global {};
+	bool m_should_cleanup { true };
+};
+
+} // namespace Lunar::Wayland

src/wayland/List.h

@@ -0,0 +1,287 @@
+#pragma once
+
+#include <cstddef>
+#include <iterator>
+
+#include <wayland-server-core.h>
+
+namespace Lunar::Wayland {
+
+namespace detail {
+
+template<typename T, wl_list T::*Member>
+constexpr std::ptrdiff_t member_offset() noexcept
+{
+	return reinterpret_cast<std::ptrdiff_t>(
+	    &(reinterpret_cast<T const volatile *>(0)->*Member));
+}
+
+template<typename T, wl_list T::*Member>
+inline T *container_of(wl_list *node) noexcept
+{
+	auto *p { reinterpret_cast<std::byte *>(node)
+		- member_offset<T, Member>() };
+	return reinterpret_cast<T *>(p);
+}
+
+template<typename T, wl_list T::*Member>
+inline T const *container_of(wl_list const *node) noexcept
+{
+	auto *p { reinterpret_cast<std::byte const *>(node)
+		- member_offset<T, Member>() };
+	return reinterpret_cast<T const *>(p);
+}
+
+} // namespace detail
+
+template<typename T, wl_list T::*Member> struct List {
+	struct Iterator {
+		using iterator_category = std::bidirectional_iterator_tag;
+		using value_type = T;
+		using difference_type = std::ptrdiff_t;
+		using pointer = T *;
+		using reference = T &;
+
+		Iterator() = default;
+		Iterator(wl_list *cur, wl_list *head)
+		    : m_cur(cur)
+		    , m_head(head)
+		{
+		}
+
+		auto operator*() const -> reference
+		{
+			return *detail::container_of<T, Member>(m_cur);
+		}
+		auto operator->() const -> pointer
+		{
+			return detail::container_of<T, Member>(m_cur);
+		}
+
+		auto operator++() -> Iterator &
+		{
+			m_cur = m_cur->next;
+			return *this;
+		}
+		auto operator++(int) -> Iterator
+		{
+			auto t { *this };
+			++(*this);
+			return t;
+		}
+
+		auto operator--() -> Iterator &
+		{
+			m_cur = (m_cur == m_head) ? m_head->prev : m_cur->prev;
+			return *this;
+		}
+		auto operator--(int) -> Iterator
+		{
+			auto t { *this };
+			--(*this);
+			return t;
+		}
+
+		friend auto operator==(Iterator a, Iterator b) -> bool
+		{
+			return a.m_cur == b.m_cur;
+		}
+		friend auto operator!=(Iterator a, Iterator b) -> bool
+		{
+			return !(a == b);
+		}
+
+	private:
+		wl_list *m_cur { nullptr };
+		wl_list *m_head { nullptr };
+	};
+
+	struct ConstIterator {
+		using iterator_category = std::bidirectional_iterator_tag;
+		using value_type = T const;
+		using difference_type = std::ptrdiff_t;
+		using pointer = T const *;
+		using reference = T const &;
+
+		ConstIterator() = default;
+		ConstIterator(wl_list const *cur, wl_list const *head)
+		    : m_cur(cur)
+		    , m_head(head)
+		{
+		}
+
+		auto operator*() const -> reference
+		{
+			return *detail::container_of<T, Member>(m_cur);
+		}
+		auto operator->() const -> pointer
+		{
+			return detail::container_of<T, Member>(m_cur);
+		}
+
+		auto operator++() -> ConstIterator &
+		{
+			m_cur = m_cur->next;
+			return *this;
+		}
+		auto operator++(int) -> ConstIterator
+		{
+			auto t { *this };
+			++(*this);
+			return t;
+		}
+
+		auto operator--() -> ConstIterator &
+		{
+			m_cur = (m_cur == m_head) ? m_head->prev : m_cur->prev;
+			return *this;
+		}
+		auto operator--(int) -> ConstIterator
+		{
+			auto t { *this };
+			--(*this);
+			return t;
+		}
+
+		friend auto operator==(ConstIterator a, ConstIterator b) -> bool
+		{
+			return a.m_cur == b.m_cur;
+		}
+		friend auto operator!=(ConstIterator a, ConstIterator b) -> bool
+		{
+			return !(a == b);
+		}
+
+	private:
+		wl_list const *m_cur { nullptr };
+		wl_list const *m_head { nullptr };
+	};
+
+	List()
+	    : m_head {}
+	    , m_external_head { nullptr }
+	    , m_should_cleanup { true }
+	{
+		wl_list_init(&m_head);
+	}
+
+	explicit List(
+	    wl_list *existing_head, bool should_cleanup = false, bool init = false)
+	    : m_head {}
+	    , m_external_head { existing_head }
+	    , m_should_cleanup { should_cleanup }
+	{
+		if (init && m_external_head)
+			wl_list_init(m_external_head);
+	}
+
+	~List()
+	{
+		if (!m_should_cleanup)
+			return;
+
+		clear();
+		if (auto *h { head_ptr() }; h)
+			wl_list_init(h);
+	}
+
+	List(List const &) = delete;
+	auto operator=(List const &) -> List & = delete;
+
+	List(List &&other) noexcept { move_from(other); }
+
+	auto operator=(List &&other) noexcept -> List &
+	{
+		if (this != &other) {
+			this->~List();
+			move_from(other);
+		}
+		return *this;
+	}
+
+	inline auto c_ptr() -> wl_list * { return head_ptr(); }
+	inline auto c_ptr() const -> wl_list const * { return head_ptr(); }
+
+	auto empty() const noexcept -> bool { return wl_list_empty(head_ptr()); }
+	auto length() const noexcept -> int { return wl_list_length(head_ptr()); }
+
+	auto push_front(T *elem) noexcept -> void
+	{
+		wl_list_insert(head_ptr(), &(elem->*Member));
+	}
+
+	auto push_back(T *elem) noexcept -> void
+	{
+		auto *h { head_ptr() };
+		wl_list_insert(h->prev, &(elem->*Member));
+	}
+
+	auto remove(T *elem) noexcept -> void
+	{
+		wl_list_remove(&(elem->*Member));
+		wl_list_init(&(elem->*Member));
+	}
+
+	auto clear() noexcept -> void
+	{
+		auto *h { head_ptr() };
+		while (!wl_list_empty(h)) {
+			auto *node { h->next };
+			wl_list_remove(node);
+			wl_list_init(node);
+		}
+	}
+
+	auto begin() noexcept -> Iterator
+	{
+		auto *h { head_ptr() };
+		return Iterator(h->next, h);
+	}
+
+	auto end() noexcept -> Iterator
+	{
+		auto *h { head_ptr() };
+		return Iterator(h, h);
+	}
+
+	auto begin() const noexcept -> ConstIterator
+	{
+		auto const *h { head_ptr() };
+		return ConstIterator(h->next, h);
+	}
+
+	auto end() const noexcept -> ConstIterator
+	{
+		auto const *h { head_ptr() };
+		return ConstIterator(h, h);
+	}
+
+private:
+	auto head_ptr() noexcept -> wl_list *
+	{
+		return m_external_head ? m_external_head : &m_head;
+	}
+
+	auto head_ptr() const noexcept -> wl_list const *
+	{
+		return m_external_head ? m_external_head : &m_head;
+	}
+
+	auto move_from(List &other) noexcept -> void
+	{
+		m_head = other.m_head;
+		m_external_head = other.m_external_head;
+		m_should_cleanup = other.m_should_cleanup;
+
+		other.m_external_head = nullptr;
+		other.m_should_cleanup = false;
+		wl_list_init(&other.m_head);
+	}
+
+private:
+	wl_list m_head {};
+	wl_list *m_external_head { nullptr };
+	bool m_should_cleanup { true };
+};
+
+} // namespace Lunar::Wayland

src/wayland/Region.h

@@ -0,0 +1,43 @@
+#pragma once
+
+#include <cstdint>
+#include <vector>
+
+#include <wayland-server-core.h>
+
+namespace Lunar::Wayland {
+
+struct Region {
+	struct Box {
+		std::int32_t x {};
+		std::int32_t y {};
+		std::int32_t width {};
+		std::int32_t height {};
+	};
+
+	explicit Region(wl_resource *resource)
+	    : m_resource(resource)
+	{
+	}
+
+	auto resource() const -> wl_resource * { return m_resource; }
+
+	auto add(std::int32_t x, std::int32_t y, std::int32_t width,
+	    std::int32_t height) -> void
+	{
+		m_boxes.push_back(Box { x, y, width, height });
+	}
+
+	auto subtract(std::int32_t x, std::int32_t y, std::int32_t width,
+	    std::int32_t height) -> void
+	{
+		m_subtract_boxes.push_back(Box { x, y, width, height });
+	}
+
+private:
+	wl_resource *m_resource {};
+	std::vector<Box> m_boxes {};
+	std::vector<Box> m_subtract_boxes {};
+};
+
+} // namespace Lunar::Wayland

src/wayland/Shm.cpp

@@ -0,0 +1,96 @@
+#include "Shm.h"
+
+#include <cerrno>
+#include <cstring>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <utility>
+
+namespace Lunar::Wayland {
+
+ShmPool::ShmPool(int fd, std::size_t size, Logger &logger)
+    : m_logger(logger)
+    , m_fd(fd)
+    , m_size(size)
+{
+	m_data = mmap(nullptr, m_size, PROT_READ | PROT_WRITE, MAP_SHARED, m_fd, 0);
+	if (m_data == MAP_FAILED) {
+		m_data = nullptr;
+		m_logger.err("Failed to mmap shm pool: {}", std::strerror(errno));
+	}
+}
+
+ShmPool::~ShmPool()
+{
+	if (m_data) {
+		munmap(m_data, m_size);
+	}
+	if (m_fd >= 0) {
+		close(m_fd);
+	}
+}
+
+auto ShmPool::resize(std::size_t new_size) -> bool
+{
+	if (!m_data) {
+		return false;
+	}
+	void *new_data = mremap(m_data, m_size, new_size, MREMAP_MAYMOVE);
+	if (new_data == MAP_FAILED) {
+		m_logger.err("Failed to resize shm pool: {}", std::strerror(errno));
+		return false;
+	}
+	m_data = new_data;
+	m_size = new_size;
+	return true;
+}
+
+auto ShmPool::data() const -> std::byte *
+{
+	return static_cast<std::byte *>(m_data);
+}
+
+ShmBuffer::ShmBuffer(std::shared_ptr<ShmPool> pool, wl_resource *resource,
+    std::int32_t offset, std::int32_t width, std::int32_t height,
+    std::int32_t stride, std::uint32_t format)
+    : pool(std::move(pool))
+    , resource(resource)
+    , offset(offset)
+    , width(width)
+    , height(height)
+    , stride(stride)
+    , format(format)
+{
+}
+
+auto ShmBuffer::data() const -> std::byte *
+{
+	if (!pool || !pool->data()) {
+		return nullptr;
+	}
+	return pool->data() + offset;
+}
+
+auto ShmBuffer::byte_size() const -> std::size_t
+{
+	if (height <= 0 || stride <= 0) {
+		return 0;
+	}
+	return static_cast<std::size_t>(height) * static_cast<std::size_t>(stride);
+}
+
+auto shm_buffer_from_resource(wl_resource *resource)
+    -> std::shared_ptr<ShmBuffer>
+{
+	if (!resource) {
+		return {};
+	}
+	auto *handle { static_cast<std::shared_ptr<ShmBuffer> *>(
+		wl_resource_get_user_data(resource)) };
+	if (!handle) {
+		return {};
+	}
+	return *handle;
+}
+
+} // namespace Lunar::Wayland

src/wayland/Shm.h

@@ -0,0 +1,48 @@
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <memory>
+
+#include <wayland-server-core.h>
+
+#include "../Logger.h"
+
+namespace Lunar::Wayland {
+
+struct ShmPool {
+	explicit ShmPool(int fd, std::size_t size, Logger &logger);
+	~ShmPool();
+
+	auto resize(std::size_t new_size) -> bool;
+	auto data() const -> std::byte *;
+	auto size() const -> std::size_t { return m_size; }
+
+private:
+	Logger &m_logger;
+	int m_fd { -1 };
+	std::size_t m_size { 0 };
+	void *m_data { nullptr };
+};
+
+struct ShmBuffer {
+	ShmBuffer(std::shared_ptr<ShmPool> pool, wl_resource *resource,
+	    std::int32_t offset, std::int32_t width, std::int32_t height,
+	    std::int32_t stride, std::uint32_t format);
+
+	auto data() const -> std::byte *;
+	auto byte_size() const -> std::size_t;
+
+	std::shared_ptr<ShmPool> pool;
+	wl_resource *resource {};
+	std::int32_t offset {};
+	std::int32_t width {};
+	std::int32_t height {};
+	std::int32_t stride {};
+	std::uint32_t format {};
+};
+
+auto shm_buffer_from_resource(wl_resource *resource)
+    -> std::shared_ptr<ShmBuffer>;
+
+} // namespace Lunar::Wayland

src/wayland/Signal.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <cassert>
+
+#include <wayland-server-core.h>
+
+namespace Lunar::Wayland {
+
+struct Signal {
+	Signal(wl_signal *signal)
+	    : m_signal { std::move(signal) }
+	{
+		assert(m_signal);
+	}
+	~Signal() = default;
+
+	inline auto c_ptr() const -> wl_signal * { return m_signal; }
+
+	template<typename T = void> auto flush(T *data)
+	{
+		wl_signal_emit_mutable(m_signal, (void *)data);
+	}
+
+private:
+	wl_signal *m_signal {};
+};
+
+} // namespace Lunar::Wayland

src/wayland/Surface.cpp

@@ -0,0 +1,98 @@
+#include "Surface.h"
+
+#include <algorithm>
+#include <utility>
+
+#include "WaylandServer.h"
+
+#include "wayland-server-protocol.h"
+
+namespace Lunar::Wayland {
+
+Surface::Surface(WaylandServer &server, wl_resource *resource)
+    : m_server(server)
+    , m_resource(resource)
+{
+	m_server.register_surface(this);
+}
+
+Surface::~Surface()
+{
+	m_server.unregister_surface(this);
+	for (auto *callback : m_frame_callbacks) {
+		if (callback) {
+			wl_callback_send_done(callback, m_server.now_ms());
+			wl_resource_destroy(callback);
+		}
+	}
+}
+
+auto Surface::attach(
+    std::shared_ptr<ShmBuffer> buffer, std::int32_t x, std::int32_t y) -> void
+{
+	m_pending_buffer = std::move(buffer);
+	m_pending_offset_x = x;
+	m_pending_offset_y = y;
+}
+
+auto Surface::damage(std::int32_t, std::int32_t, std::int32_t, std::int32_t)
+    -> void
+{
+}
+
+auto Surface::damage_buffer(
+    std::int32_t, std::int32_t, std::int32_t, std::int32_t) -> void
+{
+}
+
+auto Surface::frame(wl_resource *callback) -> void
+{
+	if (!callback) {
+		return;
+	}
+	m_frame_callbacks.push_back(callback);
+}
+
+auto Surface::commit() -> void
+{
+	auto previous { m_current_buffer };
+	m_current_buffer = m_pending_buffer;
+	m_pending_buffer.reset();
+
+	if (previous && previous != m_current_buffer && previous->resource) {
+		wl_buffer_send_release(previous->resource);
+	}
+
+	if (!m_frame_callbacks.empty()) {
+		auto callbacks { std::move(m_frame_callbacks) };
+		auto done_time { m_server.now_ms() };
+		for (auto *callback : callbacks) {
+			if (callback) {
+				wl_callback_send_done(callback, done_time);
+				wl_resource_destroy(callback);
+			}
+		}
+	}
+}
+
+auto Surface::set_opaque_region(std::shared_ptr<Region> region) -> void
+{
+	m_opaque_region = std::move(region);
+}
+
+auto Surface::set_input_region(std::shared_ptr<Region> region) -> void
+{
+	m_input_region = std::move(region);
+}
+
+auto Surface::set_buffer_transform(std::int32_t transform) -> void
+{
+	m_buffer_transform = transform;
+}
+
+auto Surface::set_buffer_scale(std::int32_t scale) -> void
+{
+	m_buffer_scale = std::max(1, scale);
+}
+
+} // namespace Lunar::Wayland

src/wayland/Surface.h

@@ -0,0 +1,53 @@
+#pragma once
+
+#include <cstdint>
+#include <memory>
+#include <vector>
+
+#include <wayland-server-core.h>
+
+#include "Region.h"
+#include "Shm.h"
+
+namespace Lunar::Wayland {
+
+struct WaylandServer;
+
+struct Surface {
+	explicit Surface(WaylandServer &server, wl_resource *resource);
+	~Surface();
+
+	auto resource() const -> wl_resource * { return m_resource; }
+	auto current_buffer() const -> std::shared_ptr<ShmBuffer> const &
+	{
+		return m_current_buffer;
+	}
+
+	auto attach(std::shared_ptr<ShmBuffer> buffer, std::int32_t x,
+	    std::int32_t y) -> void;
+	auto damage(std::int32_t x, std::int32_t y, std::int32_t width,
+	    std::int32_t height) -> void;
+	auto damage_buffer(std::int32_t x, std::int32_t y, std::int32_t width,
+	    std::int32_t height) -> void;
+	auto frame(wl_resource *callback) -> void;
+	auto commit() -> void;
+	auto set_opaque_region(std::shared_ptr<Region> region) -> void;
+	auto set_input_region(std::shared_ptr<Region> region) -> void;
+	auto set_buffer_transform(std::int32_t transform) -> void;
+	auto set_buffer_scale(std::int32_t scale) -> void;
+
+private:
+	WaylandServer &m_server;
+	wl_resource *m_resource {};
+	std::shared_ptr<ShmBuffer> m_pending_buffer {};
+	std::shared_ptr<ShmBuffer> m_current_buffer {};
+	std::shared_ptr<Region> m_opaque_region {};
+	std::shared_ptr<Region> m_input_region {};
+	std::vector<wl_resource *> m_frame_callbacks {};
+	std::int32_t m_buffer_transform { 0 };
+	std::int32_t m_buffer_scale { 1 };
+	std::int32_t m_pending_offset_x { 0 };
+	std::int32_t m_pending_offset_y { 0 };
+};
+
+} // namespace Lunar::Wayland

src/wayland/WaylandServer.cpp

@@ -0,0 +1,81 @@
+#include "WaylandServer.h"
+
+#include <algorithm>
+#include <chrono>
+#include <span>
+#include <stdexcept>
+
+namespace Lunar::Wayland {
+
+WaylandServer::WaylandServer(Logger &logger)
+    : m_logger(logger)
+{
+	m_loop = wl_display_get_event_loop(m_display.c_ptr());
+	if (!m_loop) {
+		throw std::runtime_error("Failed to get Wayland event loop");
+	}
+
+	auto *socket_name { wl_display_add_socket_auto(m_display.c_ptr()) };
+	if (!socket_name) {
+		throw std::runtime_error("Failed to create Wayland socket");
+	}
+	if (socket_name) {
+		m_socket_name = socket_name;
+	}
+
+	m_logger.info("Wayland listening on {}", m_socket_name);
+
+	m_compositor_global = create_compositor_global();
+	m_shm_global = create_shm_global();
+	m_xdg_wm_base_global = create_xdg_wm_base_global();
+}
+
+WaylandServer::~WaylandServer() = default;
+
+auto WaylandServer::dispatch() -> void
+{
+	if (!m_loop) {
+		return;
+	}
+	wl_event_loop_dispatch(m_loop, 0);
+}
+
+auto WaylandServer::flush() -> void
+{
+	wl_display_flush_clients(m_display.c_ptr());
+}
+
+auto WaylandServer::now_ms() const -> std::uint32_t
+{
+	using Clock = std::chrono::steady_clock;
+	auto now { Clock::now().time_since_epoch() };
+	auto ms {
+		std::chrono::duration_cast<std::chrono::milliseconds>(now).count()
+	};
+	return static_cast<std::uint32_t>(ms);
+}
+
+auto WaylandServer::register_surface(Surface *surface) -> void
+{
+	if (!surface) {
+		return;
+	}
+	m_surfaces.push_back(surface);
+}
+
+auto WaylandServer::unregister_surface(Surface *surface) -> void
+{
+	if (!surface) {
+		return;
+	}
+	auto it { std::remove(m_surfaces.begin(), m_surfaces.end(), surface) };
+	m_surfaces.erase(it, m_surfaces.end());
+}
+
+auto WaylandServer::surfaces() const -> std::span<Surface *const>
+{
+	return { m_surfaces.data(), m_surfaces.size() };
+}
+
+} // namespace Lunar::Wayland
+#include "Surface.h"

src/wayland/WaylandServer.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include <cstdint>
+#include <memory>
+#include <span>
+#include <string>
+#include <string_view>
+#include <vector>
+
+#include <wayland-server-core.h>
+
+#include "../Logger.h"
+
+#include "Display.h"
+#include "Global.h"
+
+namespace Lunar::Wayland {
+
+struct Surface;
+
+struct WaylandServer {
+	explicit WaylandServer(Logger &logger);
+	~WaylandServer();
+
+	auto display() -> Display & { return m_display; }
+	auto logger() -> Logger & { return m_logger; }
+	auto socket_name() const -> std::string_view { return m_socket_name; }
+	auto dispatch() -> void;
+	auto flush() -> void;
+	auto now_ms() const -> std::uint32_t;
+	auto register_surface(Surface *surface) -> void;
+	auto unregister_surface(Surface *surface) -> void;
+	auto surfaces() const -> std::span<Surface *const>;
+
+private:
+	auto create_compositor_global() -> std::unique_ptr<Global>;
+	auto create_shm_global() -> std::unique_ptr<Global>;
+	auto create_xdg_wm_base_global() -> std::unique_ptr<Global>;
+
+	Logger &m_logger;
+	Display m_display {};
+	wl_event_loop *m_loop { nullptr };
+	std::string m_socket_name {};
+	std::unique_ptr<Global> m_compositor_global {};
+	std::unique_ptr<Global> m_shm_global {};
+	std::unique_ptr<Global> m_xdg_wm_base_global {};
+	std::vector<Surface *> m_surfaces {};
+};
+
+} // namespace Lunar::Wayland

src/wayland/protocols/CompositorProtocol.cpp

@@ -0,0 +1,254 @@
+#include <algorithm>
+#include <cstdint>
+#include <memory>
+#include <utility>
+
+#include <wayland-server-core.h>
+
+#include "wayland-server-protocol.h"
+
+#include "../Region.h"
+#include "../Shm.h"
+#include "../Surface.h"
+#include "../WaylandServer.h"
+
+namespace Lunar::Wayland {
+namespace {
+
+constexpr std::uint32_t COMPOSITOR_VERSION = 4;
+
+auto resource_version(wl_resource *resource) -> std::uint32_t
+{
+	return std::min<std::uint32_t>(
+	    wl_resource_get_version(resource), COMPOSITOR_VERSION);
+}
+
+auto region_from_resource(wl_resource *resource) -> std::shared_ptr<Region>
+{
+	if (!resource) {
+		return {};
+	}
+	auto *handle { static_cast<std::shared_ptr<Region> *>(
+		wl_resource_get_user_data(resource)) };
+	if (!handle) {
+		return {};
+	}
+	return *handle;
+}
+
+void region_destroy(wl_resource *resource)
+{
+	auto *handle { static_cast<std::shared_ptr<Region> *>(
+		wl_resource_get_user_data(resource)) };
+	delete handle;
+}
+
+void region_handle_destroy(wl_client *, wl_resource *resource)
+{
+	wl_resource_destroy(resource);
+}
+
+void region_handle_add(wl_client *, wl_resource *resource, std::int32_t x,
+    std::int32_t y, std::int32_t width, std::int32_t height)
+{
+	if (auto region { region_from_resource(resource) }) {
+		region->add(x, y, width, height);
+	}
+}
+
+void region_handle_subtract(wl_client *, wl_resource *resource, std::int32_t x,
+    std::int32_t y, std::int32_t width, std::int32_t height)
+{
+	if (auto region { region_from_resource(resource) }) {
+		region->subtract(x, y, width, height);
+	}
+}
+
+struct wl_region_interface const REGION_INTERFACE = {
+	.destroy = region_handle_destroy,
+	.add = region_handle_add,
+	.subtract = region_handle_subtract,
+};
+
+auto surface_from_resource(wl_resource *resource) -> Surface *
+{
+	return static_cast<Surface *>(wl_resource_get_user_data(resource));
+}
+
+void surface_destroy_resource(wl_resource *resource)
+{
+	auto *surface { surface_from_resource(resource) };
+	delete surface;
+}
+
+void surface_handle_destroy(wl_client *, wl_resource *resource)
+{
+	wl_resource_destroy(resource);
+}
+
+void surface_handle_attach(wl_client *, wl_resource *resource,
+    wl_resource *buffer_resource, std::int32_t x, std::int32_t y)
+{
+	auto *surface { surface_from_resource(resource) };
+	if (!surface) {
+		return;
+	}
+	surface->attach(shm_buffer_from_resource(buffer_resource), x, y);
+}
+
+void surface_handle_damage(wl_client *, wl_resource *resource, std::int32_t x,
+    std::int32_t y, std::int32_t width, std::int32_t height)
+{
+	if (auto *surface { surface_from_resource(resource) }) {
+		surface->damage(x, y, width, height);
+	}
+}
+
+void surface_handle_frame(
+    wl_client *client, wl_resource *resource, std::uint32_t callback_id)
+{
+	auto *surface { surface_from_resource(resource) };
+	if (!surface) {
+		return;
+	}
+	auto version { wl_resource_get_version(resource) };
+	auto *callback_resource { wl_resource_create(
+		client, &wl_callback_interface, version, callback_id) };
+	if (!callback_resource) {
+		return;
+	}
+	wl_resource_set_implementation(
+	    callback_resource, nullptr, nullptr, nullptr);
+	surface->frame(callback_resource);
+}
+
+void surface_handle_set_opaque_region(
+    wl_client *, wl_resource *resource, wl_resource *region_resource)
+{
+	if (auto *surface { surface_from_resource(resource) }) {
+		surface->set_opaque_region(region_from_resource(region_resource));
+	}
+}
+
+void surface_handle_set_input_region(
+    wl_client *, wl_resource *resource, wl_resource *region_resource)
+{
+	if (auto *surface { surface_from_resource(resource) }) {
+		surface->set_input_region(region_from_resource(region_resource));
+	}
+}
+
+void surface_handle_commit(wl_client *, wl_resource *resource)
+{
+	if (auto *surface { surface_from_resource(resource) }) {
+		surface->commit();
+	}
+}
+
+void surface_handle_set_buffer_transform(
+    wl_client *, wl_resource *resource, std::int32_t transform)
+{
+	if (auto *surface { surface_from_resource(resource) }) {
+		surface->set_buffer_transform(transform);
+	}
+}
+
+void surface_handle_set_buffer_scale(
+    wl_client *, wl_resource *resource, std::int32_t scale)
+{
+	if (auto *surface { surface_from_resource(resource) }) {
+		surface->set_buffer_scale(scale);
+	}
+}
+
+void surface_handle_damage_buffer(wl_client *, wl_resource *resource,
+    std::int32_t x, std::int32_t y, std::int32_t width, std::int32_t height)
+{
+	if (auto *surface { surface_from_resource(resource) }) {
+		surface->damage_buffer(x, y, width, height);
+	}
+}
+
+void surface_handle_offset(
+    wl_client *, wl_resource *resource, std::int32_t x, std::int32_t y)
+{
+	(void)resource;
+	(void)x;
+	(void)y;
+}
+
+struct wl_surface_interface const SURFACE_INTERFACE = {
+	.destroy = surface_handle_destroy,
+	.attach = surface_handle_attach,
+	.damage = surface_handle_damage,
+	.frame = surface_handle_frame,
+	.set_opaque_region = surface_handle_set_opaque_region,
+	.set_input_region = surface_handle_set_input_region,
+	.commit = surface_handle_commit,
+	.set_buffer_transform = surface_handle_set_buffer_transform,
+	.set_buffer_scale = surface_handle_set_buffer_scale,
+	.damage_buffer = surface_handle_damage_buffer,
+	.offset = surface_handle_offset,
+};
+
+void compositor_handle_create_surface(
+    wl_client *client, wl_resource *resource, std::uint32_t id)
+{
+	auto *server { static_cast<WaylandServer *>(
+		wl_resource_get_user_data(resource)) };
+	if (!server) {
+		return;
+	}
+	auto version { resource_version(resource) };
+	auto *surface_resource { wl_resource_create(
+		client, &wl_surface_interface, version, id) };
+	if (!surface_resource) {
+		return;
+	}
+	auto *surface { new Surface(*server, surface_resource) };
+	wl_resource_set_implementation(surface_resource, &SURFACE_INTERFACE,
+	    surface, surface_destroy_resource);
+}
+
+void compositor_handle_create_region(
+    wl_client *client, wl_resource *resource, std::uint32_t id)
+{
+	auto version { wl_resource_get_version(resource) };
+	auto *region_resource { wl_resource_create(
+		client, &wl_region_interface, version, id) };
+	if (!region_resource) {
+		return;
+	}
+	auto region { std::make_shared<Region>(region_resource) };
+	auto *handle { new std::shared_ptr<Region>(std::move(region)) };
+	wl_resource_set_implementation(
+	    region_resource, &REGION_INTERFACE, handle, region_destroy);
+}
+
+struct wl_compositor_interface const COMPOSITOR_INTERFACE = {
+	.create_surface = compositor_handle_create_surface,
+	.create_region = compositor_handle_create_region,
+};
+
+void bind_compositor(
+    wl_client *client, void *data, std::uint32_t version, std::uint32_t id)
+{
+	auto *server { static_cast<WaylandServer *>(data) };
+	auto *resource { wl_resource_create(client, &wl_compositor_interface,
+		std::min(version, COMPOSITOR_VERSION), id) };
+	if (!resource) {
+		return;
+	}
+	wl_resource_set_implementation(
+	    resource, &COMPOSITOR_INTERFACE, server, nullptr);
+}
+
+} // namespace
+
+auto WaylandServer::create_compositor_global() -> std::unique_ptr<Global>
+{
+	return std::make_unique<Global>(display(), &wl_compositor_interface,
+	    COMPOSITOR_VERSION, this, bind_compositor);
+}
+
+} // namespace Lunar::Wayland

src/wayland/protocols/ShmProtocol.cpp

@@ -0,0 +1,171 @@
+#include <algorithm>
+#include <cstdint>
+#include <memory>
+#include <unistd.h>
+#include <utility>
+
+#include <wayland-server-core.h>
+
+#include "wayland-server-protocol.h"
+
+#include "../Shm.h"
+#include "../WaylandServer.h"
+
+namespace Lunar::Wayland {
+namespace {
+
+constexpr std::uint32_t SHM_VERSION = 2;
+
+auto shm_pool_from_resource(wl_resource *resource) -> std::shared_ptr<ShmPool>
+{
+	auto *handle { static_cast<std::shared_ptr<ShmPool> *>(
+		wl_resource_get_user_data(resource)) };
+	if (!handle) {
+		return {};
+	}
+	return *handle;
+}
+
+void shm_pool_destroy_resource(wl_resource *resource)
+{
+	auto *handle { static_cast<std::shared_ptr<ShmPool> *>(
+		wl_resource_get_user_data(resource)) };
+	delete handle;
+}
+
+void shm_buffer_destroy_resource(wl_resource *resource)
+{
+	auto *handle { static_cast<std::shared_ptr<ShmBuffer> *>(
+		wl_resource_get_user_data(resource)) };
+	delete handle;
+}
+
+void shm_pool_handle_destroy(wl_client *, wl_resource *resource)
+{
+	wl_resource_destroy(resource);
+}
+
+void shm_pool_handle_resize(
+    wl_client *, wl_resource *resource, std::int32_t size)
+{
+	auto pool { shm_pool_from_resource(resource) };
+	if (!pool) {
+		return;
+	}
+	if (size <= 0) {
+		return;
+	}
+	pool->resize(static_cast<std::size_t>(size));
+}
+
+void shm_handle_release(wl_client *, wl_resource *) { }
+
+void shm_pool_handle_create_buffer(wl_client *client, wl_resource *resource,
+    std::uint32_t id, std::int32_t offset, std::int32_t width,
+    std::int32_t height, std::int32_t stride, std::uint32_t format)
+{
+	auto pool { shm_pool_from_resource(resource) };
+	if (!pool) {
+		return;
+	}
+
+	if (width <= 0 || height <= 0 || stride <= 0 || offset < 0) {
+		wl_resource_post_error(resource, WL_SHM_ERROR_INVALID_STRIDE,
+		    "Invalid shm buffer geometry");
+		return;
+	}
+
+	if (format != WL_SHM_FORMAT_XRGB8888 && format != WL_SHM_FORMAT_ARGB8888) {
+		wl_resource_post_error(
+		    resource, WL_SHM_ERROR_INVALID_FORMAT, "Unsupported shm format");
+		return;
+	}
+
+	auto required { static_cast<std::size_t>(offset)
+		+ static_cast<std::size_t>(height) * static_cast<std::size_t>(stride) };
+	if (required > pool->size()) {
+		wl_resource_post_error(resource, WL_SHM_ERROR_INVALID_STRIDE,
+		    "Shm buffer size out of bounds");
+		return;
+	}
+
+	auto *buffer_resource { wl_resource_create(
+		client, &wl_buffer_interface, 1, id) };
+	if (!buffer_resource) {
+		return;
+	}
+
+	auto buffer { std::make_shared<ShmBuffer>(
+		pool, buffer_resource, offset, width, height, stride, format) };
+	auto *handle { new std::shared_ptr<ShmBuffer>(std::move(buffer)) };
+	wl_resource_set_implementation(
+	    buffer_resource, nullptr, handle, shm_buffer_destroy_resource);
+}
+
+struct wl_shm_pool_interface const SHM_POOL_INTERFACE = {
+	.create_buffer = shm_pool_handle_create_buffer,
+	.destroy = shm_pool_handle_destroy,
+	.resize = shm_pool_handle_resize,
+};
+
+void shm_handle_create_pool(wl_client *client, wl_resource *resource,
+    std::uint32_t id, int fd, std::int32_t size)
+{
+	auto *server
+	    = static_cast<WaylandServer *>(wl_resource_get_user_data(resource));
+	if (!server) {
+		return;
+	}
+	if (size <= 0) {
+		wl_resource_post_error(
+		    resource, WL_SHM_ERROR_INVALID_STRIDE, "Invalid shm pool size");
+		close(fd);
+		return;
+	}
+
+	auto pool { std::make_shared<ShmPool>(
+		fd, static_cast<std::size_t>(size), server->logger()) };
+	if (!pool->data()) {
+		wl_resource_post_error(
+		    resource, WL_SHM_ERROR_INVALID_FD, "Failed to mmap shm pool");
+		return;
+	}
+
+	auto *pool_resource
+	    = wl_resource_create(client, &wl_shm_pool_interface, 1, id);
+	if (!pool_resource) {
+		return;
+	}
+	auto *handle { new std::shared_ptr<ShmPool>(std::move(pool)) };
+	wl_resource_set_implementation(
+	    pool_resource, &SHM_POOL_INTERFACE, handle, shm_pool_destroy_resource);
+}
+
+struct wl_shm_interface const SHM_INTERFACE = {
+	.create_pool = shm_handle_create_pool,
+	.release = shm_handle_release,
+};
+
+void bind_shm(
+    wl_client *client, void *data, std::uint32_t version, std::uint32_t id)
+{
+	auto *server { static_cast<WaylandServer *>(data) };
+	auto *resource { wl_resource_create(
+		client, &wl_shm_interface, std::min(version, SHM_VERSION), id) };
+	if (!resource) {
+		return;
+	}
+	wl_resource_set_implementation(resource, &SHM_INTERFACE, server, nullptr);
+	wl_shm_send_format(resource, WL_SHM_FORMAT_XRGB8888);
+	wl_shm_send_format(resource, WL_SHM_FORMAT_ARGB8888);
+}
+
+} // namespace
+
+auto WaylandServer::create_shm_global() -> std::unique_ptr<Global>
+{
+	return std::make_unique<Global>(
+	    display(), &wl_shm_interface, SHM_VERSION, this, bind_shm);
+}
+
+} // namespace Lunar::Wayland

src/wayland/protocols/XdgShellProtocol.cpp

@@ -0,0 +1,327 @@
+#include <algorithm>
+#include <cstdint>
+
+#include <wayland-server-core.h>
+
+#include "xdg-shell-server-protocol.h"
+
+#include "../WaylandServer.h"
+
+namespace Lunar::Wayland {
+namespace {
+
+constexpr std::uint32_t XDG_WM_BASE_VERSION = 7;
+
+struct XdgSurface {
+	WaylandServer &server;
+	wl_resource *resource {};
+	wl_resource *surface_resource {};
+	wl_resource *toplevel_resource {};
+	std::uint32_t last_serial { 0 };
+};
+
+struct XdgToplevel {
+	WaylandServer &server;
+	wl_resource *resource {};
+	XdgSurface *surface {};
+};
+
+extern struct xdg_toplevel_interface const XDG_TOPLEVEL_INTERFACE_IMPL;
+
+auto xdg_surface_from_resource(wl_resource *resource) -> XdgSurface *
+{
+	return static_cast<XdgSurface *>(wl_resource_get_user_data(resource));
+}
+
+auto xdg_toplevel_from_resource(wl_resource *resource) -> XdgToplevel *
+{
+	return static_cast<XdgToplevel *>(wl_resource_get_user_data(resource));
+}
+
+auto send_configure(XdgSurface &surface) -> void
+{
+	std::uint32_t serial = surface.server.display().next_serial();
+	if (surface.toplevel_resource) {
+		wl_array states;
+		wl_array_init(&states);
+		xdg_toplevel_send_configure(surface.toplevel_resource, 0, 0, &states);
+		wl_array_release(&states);
+	}
+	surface.last_serial = serial;
+	xdg_surface_send_configure(surface.resource, serial);
+}
+
+auto xdg_positioner_handle_destroy(wl_client *, wl_resource *resource) -> void
+{
+	wl_resource_destroy(resource);
+}
+
+auto xdg_positioner_handle_set_size(
+    wl_client *, wl_resource *, std::int32_t, std::int32_t) -> void
+{
+}
+
+auto xdg_positioner_handle_set_anchor_rect(wl_client *, wl_resource *,
+    std::int32_t, std::int32_t, std::int32_t, std::int32_t) -> void
+{
+}
+
+auto xdg_positioner_handle_set_anchor(wl_client *, wl_resource *, std::uint32_t)
+    -> void
+{
+}
+
+auto xdg_positioner_handle_set_gravity(
+    wl_client *, wl_resource *, std::uint32_t) -> void
+{
+}
+
+auto xdg_positioner_handle_set_constraint_adjustment(
+    wl_client *, wl_resource *, std::uint32_t) -> void
+{
+}
+
+auto xdg_positioner_handle_set_offset(
+    wl_client *, wl_resource *, std::int32_t, std::int32_t) -> void
+{
+}
+
+auto xdg_positioner_handle_set_reactive(wl_client *, wl_resource *) -> void { }
+
+auto xdg_positioner_handle_set_parent_size(
+    wl_client *, wl_resource *, std::int32_t, std::int32_t) -> void
+{
+}
+
+auto xdg_positioner_handle_set_parent_configure(
+    wl_client *, wl_resource *, std::uint32_t) -> void
+{
+}
+
+struct xdg_positioner_interface const XDG_POSITIONER_INTERFACE_IMPL = {
+	.destroy = xdg_positioner_handle_destroy,
+	.set_size = xdg_positioner_handle_set_size,
+	.set_anchor_rect = xdg_positioner_handle_set_anchor_rect,
+	.set_anchor = xdg_positioner_handle_set_anchor,
+	.set_gravity = xdg_positioner_handle_set_gravity,
+	.set_constraint_adjustment
+	= xdg_positioner_handle_set_constraint_adjustment,
+	.set_offset = xdg_positioner_handle_set_offset,
+	.set_reactive = xdg_positioner_handle_set_reactive,
+	.set_parent_size = xdg_positioner_handle_set_parent_size,
+	.set_parent_configure = xdg_positioner_handle_set_parent_configure,
+};
+
+auto xdg_surface_destroy_resource(wl_resource *resource) -> void
+{
+	auto *surface { xdg_surface_from_resource(resource) };
+	delete surface;
+}
+
+auto xdg_surface_handle_destroy(wl_client *, wl_resource *resource) -> void
+{
+	wl_resource_destroy(resource);
+}
+
+auto xdg_surface_handle_get_toplevel(
+    wl_client *client, wl_resource *resource, std::uint32_t id) -> void
+{
+	auto *surface { xdg_surface_from_resource(resource) };
+	if (!surface) {
+		return;
+	}
+	auto version { wl_resource_get_version(resource) };
+	auto *toplevel_resource { wl_resource_create(
+		client, &::xdg_toplevel_interface, version, id) };
+	if (!toplevel_resource) {
+		return;
+	}
+	auto *toplevel { new XdgToplevel {
+		surface->server, toplevel_resource, surface } };
+	surface->toplevel_resource = toplevel_resource;
+	wl_resource_set_implementation(toplevel_resource,
+	    &XDG_TOPLEVEL_INTERFACE_IMPL, toplevel, [](wl_resource *res) {
+		    auto *tl { xdg_toplevel_from_resource(res) };
+		    if (tl && tl->surface && tl->surface->toplevel_resource == res) {
+			    tl->surface->toplevel_resource = nullptr;
+		    }
+		    delete tl;
+	    });
+
+	send_configure(*surface);
+}
+
+auto xdg_surface_handle_get_popup(wl_client *, wl_resource *, std::uint32_t,
+    wl_resource *, wl_resource *) -> void
+{
+}
+
+auto xdg_surface_handle_set_window_geometry(wl_client *, wl_resource *,
+    std::int32_t, std::int32_t, std::int32_t, std::int32_t) -> void
+{
+}
+
+auto xdg_surface_handle_ack_configure(
+    wl_client *, wl_resource *resource, std::uint32_t serial) -> void
+{
+	if (auto *surface { xdg_surface_from_resource(resource) }) {
+		surface->last_serial = serial;
+	}
+}
+
+struct xdg_surface_interface const XDG_SURFACE_INTERFACE_IMPL = {
+	.destroy = xdg_surface_handle_destroy,
+	.get_toplevel = xdg_surface_handle_get_toplevel,
+	.get_popup = xdg_surface_handle_get_popup,
+	.set_window_geometry = xdg_surface_handle_set_window_geometry,
+	.ack_configure = xdg_surface_handle_ack_configure,
+};
+
+auto xdg_toplevel_handle_destroy(wl_client *, wl_resource *resource) -> void
+{
+	wl_resource_destroy(resource);
+}
+
+auto xdg_toplevel_handle_set_parent(wl_client *, wl_resource *, wl_resource *)
+    -> void
+{
+}
+
+auto xdg_toplevel_handle_set_title(wl_client *, wl_resource *, char const *)
+    -> void
+{
+}
+
+auto xdg_toplevel_handle_set_app_id(wl_client *, wl_resource *, char const *)
+    -> void
+{
+}
+
+auto xdg_toplevel_handle_show_window_menu(wl_client *, wl_resource *,
+    wl_resource *, std::uint32_t, std::int32_t, std::int32_t) -> void
+{
+}
+
+auto xdg_toplevel_handle_move(
+    wl_client *, wl_resource *, wl_resource *, std::uint32_t) -> void
+{
+}
+
+auto xdg_toplevel_handle_resize(wl_client *, wl_resource *, wl_resource *,
+    std::uint32_t, std::uint32_t) -> void
+{
+}
+
+auto xdg_toplevel_handle_set_max_size(
+    wl_client *, wl_resource *, std::int32_t, std::int32_t) -> void
+{
+}
+
+auto xdg_toplevel_handle_set_min_size(
+    wl_client *, wl_resource *, std::int32_t, std::int32_t) -> void
+{
+}
+
+auto xdg_toplevel_handle_set_maximized(wl_client *, wl_resource *) -> void { }
+
+auto xdg_toplevel_handle_unset_maximized(wl_client *, wl_resource *) -> void { }
+
+auto xdg_toplevel_handle_set_fullscreen(
+    wl_client *, wl_resource *, wl_resource *) -> void
+{
+}
+
+auto xdg_toplevel_handle_unset_fullscreen(wl_client *, wl_resource *) -> void {
+}
+
+auto xdg_toplevel_handle_set_minimized(wl_client *, wl_resource *) -> void { }
+
+struct xdg_toplevel_interface const XDG_TOPLEVEL_INTERFACE_IMPL = {
+	.destroy = xdg_toplevel_handle_destroy,
+	.set_parent = xdg_toplevel_handle_set_parent,
+	.set_title = xdg_toplevel_handle_set_title,
+	.set_app_id = xdg_toplevel_handle_set_app_id,
+	.show_window_menu = xdg_toplevel_handle_show_window_menu,
+	.move = xdg_toplevel_handle_move,
+	.resize = xdg_toplevel_handle_resize,
+	.set_max_size = xdg_toplevel_handle_set_max_size,
+	.set_min_size = xdg_toplevel_handle_set_min_size,
+	.set_maximized = xdg_toplevel_handle_set_maximized,
+	.unset_maximized = xdg_toplevel_handle_unset_maximized,
+	.set_fullscreen = xdg_toplevel_handle_set_fullscreen,
+	.unset_fullscreen = xdg_toplevel_handle_unset_fullscreen,
+	.set_minimized = xdg_toplevel_handle_set_minimized,
+};
+
+auto xdg_wm_base_handle_destroy(wl_client *, wl_resource *resource) -> void
+{
+	wl_resource_destroy(resource);
+}
+
+auto xdg_wm_base_handle_create_positioner(
+    wl_client *client, wl_resource *resource, std::uint32_t id) -> void
+{
+	auto version { wl_resource_get_version(resource) };
+	auto *positioner { wl_resource_create(
+		client, &::xdg_positioner_interface, version, id) };
+	if (!positioner) {
+		return;
+	}
+	wl_resource_set_implementation(
+	    positioner, &XDG_POSITIONER_INTERFACE_IMPL, nullptr, nullptr);
+}
+
+auto xdg_wm_base_handle_get_xdg_surface(wl_client *client,
+    wl_resource *resource, std::uint32_t id, wl_resource *surface_resource)
+    -> void
+{
+	auto *server
+	    = static_cast<WaylandServer *>(wl_resource_get_user_data(resource));
+	if (!server) {
+		return;
+	}
+	auto version { wl_resource_get_version(resource) };
+	auto *xdg_surface_resource { wl_resource_create(
+		client, &::xdg_surface_interface, version, id) };
+	if (!xdg_surface_resource) {
+		return;
+	}
+	auto *surface { new XdgSurface {
+		*server, xdg_surface_resource, surface_resource, nullptr, 0 } };
+	wl_resource_set_implementation(xdg_surface_resource,
+	    &XDG_SURFACE_INTERFACE_IMPL, surface, xdg_surface_destroy_resource);
+}
+
+auto xdg_wm_base_handle_pong(wl_client *, wl_resource *, std::uint32_t) -> void
+{
+}
+
+struct xdg_wm_base_interface const XDG_WM_BASE_INTERFACE_IMPL = {
+	.destroy = xdg_wm_base_handle_destroy,
+	.create_positioner = xdg_wm_base_handle_create_positioner,
+	.get_xdg_surface = xdg_wm_base_handle_get_xdg_surface,
+	.pong = xdg_wm_base_handle_pong,
+};
+
+auto bind_xdg_wm_base(wl_client *client, void *data, std::uint32_t version,
+    std::uint32_t id) -> void
+{
+	auto *server { static_cast<WaylandServer *>(data) };
+	auto *resource { wl_resource_create(client, &::xdg_wm_base_interface,
+		std::min(version, XDG_WM_BASE_VERSION), id) };
+	if (!resource) {
+		return;
+	}
+	wl_resource_set_implementation(
+	    resource, &XDG_WM_BASE_INTERFACE_IMPL, server, nullptr);
+}
+
+} // namespace
+
+auto WaylandServer::create_xdg_wm_base_global() -> std::unique_ptr<Global>
+{
+	return std::make_unique<Global>(display(), &::xdg_wm_base_interface,
+	    XDG_WM_BASE_VERSION, this, bind_xdg_wm_base);
+}
+
+} // namespace Lunar::Wayland

tools/shm_life.cpp

@@ -0,0 +1,417 @@
+#define _GNU_SOURCE
+#include <algorithm>
+#include <chrono>
+#include <cmath>
+#include <csignal>
+#include <cstdint>
+#include <cstdlib>
+#include <cstring>
+#include <fcntl.h>
+#include <iostream>
+#include <print>
+#include <random>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <thread>
+#include <unistd.h>
+#include <vector>
+
+#include "xdg-shell-client-protocol.h"
+#include <wayland-client.h>
+
+static wl_compositor *g_compositor;
+static wl_shm *g_shm;
+static xdg_wm_base *g_xdg_wm_base;
+static xdg_surface *g_xdg_surface;
+static xdg_toplevel *g_xdg_toplevel;
+static bool g_configured;
+static std::sig_atomic_t volatile g_running { 1 };
+
+static auto handle_signal(int) -> void { g_running = 0; }
+
+static auto registry_global(void *data, wl_registry *registry, uint32_t name,
+    char const *interface, uint32_t version) -> void
+{
+	(void)data;
+	if (std::strcmp(interface, "wl_compositor") == 0) {
+		g_compositor = static_cast<wl_compositor *>(wl_registry_bind(registry,
+		    name, &wl_compositor_interface, version < 4 ? version : 4));
+	} else if (std::strcmp(interface, "wl_shm") == 0) {
+		g_shm = static_cast<wl_shm *>(wl_registry_bind(
+		    registry, name, &wl_shm_interface, version < 1 ? version : 1));
+	} else if (std::strcmp(interface, "xdg_wm_base") == 0) {
+		g_xdg_wm_base = static_cast<xdg_wm_base *>(wl_registry_bind(
+		    registry, name, &xdg_wm_base_interface, version < 7 ? version : 7));
+	}
+}
+
+static auto registry_global_remove(
+    void *data, wl_registry *registry, uint32_t name) -> void
+{
+	(void)data;
+	(void)registry;
+	(void)name;
+}
+
+static wl_registry_listener const registry_listener = {
+	.global = registry_global,
+	.global_remove = registry_global_remove,
+};
+
+static auto xdg_wm_base_handle_ping(
+    void *, xdg_wm_base *wm_base, uint32_t serial) -> void
+{
+	xdg_wm_base_pong(wm_base, serial);
+}
+
+static xdg_wm_base_listener const xdg_wm_base_listener = {
+	.ping = xdg_wm_base_handle_ping,
+};
+
+static auto xdg_surface_handle_configure(
+    void *, xdg_surface *surface, uint32_t serial) -> void
+{
+	xdg_surface_ack_configure(surface, serial);
+	g_configured = true;
+}
+
+static xdg_surface_listener const xdg_surface_listener = {
+	.configure = xdg_surface_handle_configure,
+};
+
+static auto xdg_toplevel_handle_configure(
+    void *, xdg_toplevel *, int32_t, int32_t, wl_array *) -> void
+{
+}
+
+static auto xdg_toplevel_handle_close(void *, xdg_toplevel *) -> void { }
+
+static auto xdg_toplevel_handle_configure_bounds(
+    void *, xdg_toplevel *, int32_t, int32_t) -> void
+{
+}
+
+static auto xdg_toplevel_handle_wm_capabilities(
+    void *, xdg_toplevel *, wl_array *) -> void
+{
+}
+
+static xdg_toplevel_listener const xdg_toplevel_listener = {
+	.configure = xdg_toplevel_handle_configure,
+	.close = xdg_toplevel_handle_close,
+	.configure_bounds = xdg_toplevel_handle_configure_bounds,
+	.wm_capabilities = xdg_toplevel_handle_wm_capabilities,
+};
+
+static auto create_shm_file(size_t size) -> int
+{
+	int fd { memfd_create("shm_life", 0) };
+	if (fd < 0) {
+		return -1;
+	}
+	if (ftruncate(fd, static_cast<off_t>(size)) != 0) {
+		close(fd);
+		return -1;
+	}
+	return fd;
+}
+
+auto main(int argc, char **argv) -> int
+{
+	auto *display { wl_display_connect(nullptr) };
+	if (!display) {
+		std::println(std::cerr, "Failed to connect to Wayland display.");
+		return 1;
+	}
+
+	auto *registry { wl_display_get_registry(display) };
+	if (!registry) {
+		std::println(std::cerr, "Failed to fetch Wayland registry.");
+		wl_display_disconnect(display);
+		return 1;
+	}
+
+	if (wl_registry_add_listener(registry, &registry_listener, nullptr) < 0) {
+		std::println(std::cerr, "Failed to add registry listener.");
+		wl_display_disconnect(display);
+		return 1;
+	}
+	if (wl_display_roundtrip(display) < 0) {
+		std::println(std::cerr, "Failed to sync Wayland registry.");
+		wl_display_disconnect(display);
+		return 1;
+	}
+
+	if (!g_compositor || !g_shm || !g_xdg_wm_base) {
+		std::println(std::cerr, "Missing compositor or xdg globals.");
+		wl_display_disconnect(display);
+		return 1;
+	}
+
+	std::signal(SIGINT, handle_signal);
+	std::signal(SIGTERM, handle_signal);
+
+	if (xdg_wm_base_add_listener(g_xdg_wm_base, &xdg_wm_base_listener, nullptr)
+	    < 0) {
+		std::println(std::cerr, "Failed to add xdg_wm_base listener.");
+		wl_display_disconnect(display);
+		return 1;
+	}
+
+	constexpr int width { 640 };
+	constexpr int height { 480 };
+	int cell_size { 5 };
+	if (argc > 1) {
+		long requested { std::strtol(argv[1], nullptr, 10) };
+		if (requested >= 2 && requested <= 80) {
+			cell_size = static_cast<int>(requested);
+		}
+	}
+	int grid_width { width / cell_size };
+	int grid_height { height / cell_size };
+	constexpr int stride { width * 4 };
+	constexpr size_t size { static_cast<size_t>(stride) * height };
+	int fd { create_shm_file(size) };
+	if (fd < 0) {
+		std::println(std::cerr, "Failed to create shm file.");
+		wl_display_disconnect(display);
+		return 1;
+	}
+
+	auto *data { static_cast<uint32_t *>(
+		mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) };
+	if (data == MAP_FAILED) {
+		std::println(std::cerr, "Failed to mmap shm.");
+		close(fd);
+		wl_display_disconnect(display);
+		return 1;
+	}
+
+	std::vector<uint8_t> grid(static_cast<size_t>(grid_width * grid_height), 0);
+	std::vector<uint8_t> next(static_cast<size_t>(grid_width * grid_height), 0);
+	std::minstd_rand rng(std::random_device {}());
+	std::bernoulli_distribution alive_dist(0.45);
+	std::vector<uint64_t> history;
+	float hue { 0.0f };
+	float hue_step { 1.5f };
+
+	auto hue_to_rgb { [](float hue_degrees) -> uint32_t {
+		float h { std::fmod(hue_degrees, 360.0f) / 360.0f };
+		float s { 1.0f };
+		float l { 0.5f };
+		auto hue_to_channel { [](float p, float q, float t) -> float {
+			if (t < 0.0f) {
+				t += 1.0f;
+			}
+			if (t > 1.0f) {
+				t -= 1.0f;
+			}
+			if (t < 1.0f / 6.0f) {
+				return p + (q - p) * 6.0f * t;
+			}
+			if (t < 1.0f / 2.0f) {
+				return q;
+			}
+			if (t < 2.0f / 3.0f) {
+				return p + (q - p) * (2.0f / 3.0f - t) * 6.0f;
+			}
+			return p;
+		} };
+		float r { l };
+		float g { l };
+		float b { l };
+		if (s > 0.0f) {
+			float q { l < 0.5f ? l * (1.0f + s) : l + s - l * s };
+			float p { 2.0f * l - q };
+			r = hue_to_channel(p, q, h + 1.0f / 3.0f);
+			g = hue_to_channel(p, q, h);
+			b = hue_to_channel(p, q, h - 1.0f / 3.0f);
+		}
+		uint8_t rr { static_cast<uint8_t>(r * 255.0f) };
+		uint8_t gg { static_cast<uint8_t>(g * 255.0f) };
+		uint8_t bb { static_cast<uint8_t>(b * 255.0f) };
+		return 0xff000000u | (uint32_t)rr << 16 | (uint32_t)gg << 8
+		    | (uint32_t)bb;
+	} };
+
+	auto randomize_grid { [&]() -> void {
+		for (int y = 0; y < grid_height; ++y) {
+			for (int x = 0; x < grid_width; ++x) {
+				grid[y * grid_width + x] = alive_dist(rng) ? 1 : 0;
+			}
+		}
+		std::fill(next.begin(), next.end(), 0);
+		history.clear();
+	} };
+
+	auto hash_grid { [&]() -> uint64_t {
+		uint64_t hash { 1469598103934665603ull };
+		for (uint8_t cell : grid) {
+			hash ^= static_cast<uint64_t>(cell);
+			hash *= 1099511628211ull;
+		}
+		return hash;
+	} };
+
+	randomize_grid();
+
+	auto *pool { wl_shm_create_pool(g_shm, fd, static_cast<int>(size)) };
+	auto *buffer { wl_shm_pool_create_buffer(
+		pool, 0, width, height, stride, WL_SHM_FORMAT_ARGB8888) };
+	auto *surface { wl_compositor_create_surface(g_compositor) };
+	if (!pool || !buffer || !surface) {
+		std::println(std::cerr, "Failed to create shm objects.");
+		if (surface) {
+			wl_surface_destroy(surface);
+		}
+		if (buffer) {
+			wl_buffer_destroy(buffer);
+		}
+		if (pool) {
+			wl_shm_pool_destroy(pool);
+		}
+		munmap(data, size);
+		close(fd);
+		wl_display_disconnect(display);
+		return 1;
+	}
+
+	g_xdg_surface = xdg_wm_base_get_xdg_surface(g_xdg_wm_base, surface);
+	if (!g_xdg_surface) {
+		std::println(std::cerr, "Failed to create xdg_surface.");
+		wl_surface_destroy(surface);
+		wl_buffer_destroy(buffer);
+		wl_shm_pool_destroy(pool);
+		munmap(data, size);
+		close(fd);
+		wl_display_disconnect(display);
+		return 1;
+	}
+	if (xdg_surface_add_listener(g_xdg_surface, &xdg_surface_listener, nullptr)
+	    < 0) {
+		std::println(std::cerr, "Failed to add xdg_surface listener.");
+		xdg_surface_destroy(g_xdg_surface);
+		wl_surface_destroy(surface);
+		wl_buffer_destroy(buffer);
+		wl_shm_pool_destroy(pool);
+		munmap(data, size);
+		close(fd);
+		wl_display_disconnect(display);
+		return 1;
+	}
+
+	g_xdg_toplevel = xdg_surface_get_toplevel(g_xdg_surface);
+	if (g_xdg_toplevel) {
+		xdg_toplevel_add_listener(
+		    g_xdg_toplevel, &xdg_toplevel_listener, nullptr);
+		xdg_toplevel_set_title(g_xdg_toplevel, "life");
+		xdg_toplevel_set_app_id(g_xdg_toplevel, "lunar.life");
+	}
+
+	wl_surface_commit(surface);
+	if (wl_display_roundtrip(display) < 0 || !g_configured) {
+		std::println(std::cerr, "Failed to receive initial configure.");
+		if (g_xdg_toplevel) {
+			xdg_toplevel_destroy(g_xdg_toplevel);
+		}
+		xdg_surface_destroy(g_xdg_surface);
+		wl_surface_destroy(surface);
+		wl_buffer_destroy(buffer);
+		wl_shm_pool_destroy(pool);
+		munmap(data, size);
+		close(fd);
+		wl_display_disconnect(display);
+		return 1;
+	}
+
+	wl_surface_attach(surface, buffer, 0, 0);
+	wl_surface_commit(surface);
+	wl_display_flush(display);
+
+	auto last_tick { std::chrono::steady_clock::now() };
+	while (g_running) {
+		wl_display_dispatch_pending(display);
+
+		auto now { std::chrono::steady_clock::now() };
+		auto dt { now - last_tick };
+		if (dt < std::chrono::milliseconds(16)) {
+			std::this_thread::sleep_for(std::chrono::milliseconds(4));
+			continue;
+		}
+		last_tick = now;
+
+		for (int y = 0; y < grid_height; ++y) {
+			for (int x = 0; x < grid_width; ++x) {
+				int neighbors { 0 };
+				for (int oy = -1; oy <= 1; ++oy) {
+					for (int ox = -1; ox <= 1; ++ox) {
+						if (ox == 0 && oy == 0) {
+							continue;
+						}
+						int ny { (y + oy + grid_height) % grid_height };
+						int nx { (x + ox + grid_width) % grid_width };
+						neighbors += grid[ny * grid_width + nx];
+					}
+				}
+				uint8_t alive { grid[y * grid_width + x] };
+				if (alive) {
+					next[y * grid_width + x]
+					    = (neighbors == 2 || neighbors == 3) ? 1 : 0;
+				} else {
+					next[y * grid_width + x] = (neighbors == 3) ? 1 : 0;
+				}
+			}
+		}
+
+		grid.swap(next);
+		std::fill(next.begin(), next.end(), 0);
+
+		uint64_t current_hash { hash_grid() };
+		bool repeating { std::find(history.begin(), history.end(), current_hash)
+			!= history.end() };
+		if (repeating) {
+			randomize_grid();
+			current_hash = hash_grid();
+		}
+		history.push_back(current_hash);
+		if (history.size() > 5) {
+			history.erase(history.begin());
+		}
+
+		hue += hue_step;
+		if (hue >= 360.0f) {
+			hue -= 360.0f;
+		}
+		uint32_t alive_color { hue_to_rgb(hue) };
+		for (int y = 0; y < height; ++y) {
+			int gy { y / cell_size };
+			for (int x = 0; x < width; ++x) {
+				int gx { x / cell_size };
+				uint8_t alive { grid[gy * grid_width + gx] };
+				if (alive) {
+					data[y * width + x] = alive_color;
+				} else {
+					data[y * width + x] = 0x00000000u;
+				}
+			}
+		}
+
+		wl_surface_attach(surface, buffer, 0, 0);
+		wl_surface_damage_buffer(surface, 0, 0, width, height);
+		wl_surface_commit(surface);
+		wl_display_flush(display);
+	}
+
+	if (g_xdg_toplevel) {
+		xdg_toplevel_destroy(g_xdg_toplevel);
+	}
+	if (g_xdg_surface) {
+		xdg_surface_destroy(g_xdg_surface);
+	}
+	wl_buffer_destroy(buffer);
+	wl_shm_pool_destroy(pool);
+	wl_surface_destroy(surface);
+	munmap(data, size);
+	close(fd);
+	wl_display_disconnect(display);
+}