yes

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

.clang-format

@@ -1,4 +1,3 @@
----
 UseTab: ForIndentation
 TabWidth: 4
 IndentWidth: 4
@@ -6,11 +5,11 @@ ColumnLimit: 80
 
 AlignEscapedNewlines: DontAlign
 AlignTrailingComments:
-    Kind: Always
+	Kind: Always
-    OverEmptyLines: 0
+	OverEmptyLines: 0
 BasedOnStyle: WebKit
 BraceWrapping:
-    AfterFunction: true
+	AfterFunction: true
 BreakBeforeBraces: Custom
 BreakBeforeInheritanceComma: true
 BreakConstructorInitializers: BeforeComma
@@ -19,10 +18,9 @@ IndentRequiresClause: false
 InsertNewlineAtEOF: true
 LineEnding: LF
 NamespaceIndentation: None
-QualifierAlignment: Right
+PointerAlignment: Right	# east pointer
+QualifierAlignment: Right	# east const
 RemoveSemicolon: true
 RequiresClausePosition: WithFollowing
 RequiresExpressionIndentation: OuterScope
 SpaceAfterTemplateKeyword: false
-
-...

CMakeLists.txt

@@ -0,0 +1,29 @@
+cmake_minimum_required(VERSION 3.30)
+
+project(LunarWM C CXX)
+
+set(CMAKE_CXX_STANDARD 23)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+find_package(PkgConfig)
+
+pkg_check_modules(WAYLAND REQUIRED IMPORTED_TARGET GLOBAL wayland-server)
+pkg_check_modules(EGL REQUIRED IMPORTED_TARGET egl)
+pkg_check_modules(GLES2 REQUIRED IMPORTED_TARGET glesv2)
+
+add_executable(${PROJECT_NAME})
+target_sources(${PROJECT_NAME} PUBLIC
+	src/main.cpp
+)
+target_sources(${PROJECT_NAME} PUBLIC FILE_SET CXX_MODULES FILES
+	src/wl/Shm.cppm
+	src/wl/Subsurface.cppm
+	src/wl/Subcompositor.cppm
+	src/LunarWM.cppm
+)
+target_link_libraries(${PROJECT_NAME} PUBLIC
+	PkgConfig::WAYLAND
+	PkgConfig::EGL
+	PkgConfig::GLES2
+)
+

flake.lock

@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1751011381,
+        "narHash": "sha256-krGXKxvkBhnrSC/kGBmg5MyupUUT5R6IBCLEzx9jhMM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "30e2e2857ba47844aa71991daa6ed1fc678bcbb7",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -22,8 +22,8 @@
         };
       in
       {
-        devShells.default = pkgs.mkShell {
+        devShells.default = pkgs.mkShell.override { stdenv = pkgs.llvmPackages_20.libcxxStdenv; } {
-          buildInputs = with pkgs; [
+          packages = with pkgs; [
             pkg-config
             cmake
             ninja
@@ -36,7 +36,6 @@
             xorg.libxcb
             pixman
             libgbm
-            vulkan-loader
             lcms2
             seatd
             libdisplay-info
@@ -46,7 +45,6 @@
             xorg.xcbutilwm
             xorg.xcbutilerrors
 
-            wlroots
             libffi
             wayland
             wayland-scanner

src/LunarWM.cppm

@@ -0,0 +1,153 @@
+module;
+
+#include <memory>
+#include <poll.h>
+#include <print>
+
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <GLES2/gl2.h>
+#include <wayland-server.h>
+
+export module LunarWM.LunarWM;
+
+import LunarWM.wl.Subcompositor;
+import LunarWM.wl.Shm;
+
+namespace LunarWM {
+
+export struct LunarWM {
+  LunarWM();
+  ~LunarWM();
+
+  void run();
+  void terminate();
+
+private:
+  struct {
+    wl_display *display = nullptr;
+    wl_event_loop *event_loop = nullptr;
+    std::string socket;
+
+    std::unique_ptr<Shm> shm;
+    wl_global *subcompositor = nullptr;
+  } m_wayland;
+
+  struct {
+    EGLDisplay display = EGL_NO_DISPLAY;
+    EGLConfig config;
+    EGLContext context;
+  } m_egl;
+
+  bool m_running = true;
+};
+
+LunarWM::LunarWM() {
+  { // Wayland
+    m_wayland.display = wl_display_create();
+    if (!m_wayland.display)
+      throw std::runtime_error("Failed to create wayland display");
+
+    auto const socket = wl_display_add_socket_auto(m_wayland.display);
+    if (!socket)
+      throw std::runtime_error("Failed to add socket");
+    m_wayland.socket = socket;
+    setenv("WAYLAND_DISPLAY", m_wayland.socket.c_str(), 1);
+
+    m_wayland.event_loop = wl_display_get_event_loop(m_wayland.display);
+    if (!m_wayland.event_loop)
+      throw std::runtime_error("Failed to get display event loop");
+  }
+
+  { // EGL
+    m_egl.display = eglGetPlatformDisplay(EGL_PLATFORM_SURFACELESS_MESA,
+                                          EGL_DEFAULT_DISPLAY, nullptr);
+    bool ret = eglInitialize(m_egl.display, nullptr, nullptr);
+    if (ret != EGL_TRUE)
+      throw std::runtime_error("eglInitialize failed");
+
+    // clang-format off
+		EGLint attribs[] {
+			EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
+			EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
+			EGL_NONE
+		};
+    // clang-format on
+
+    EGLint num_configs;
+    ret =
+        eglChooseConfig(m_egl.display, attribs, &m_egl.config, 1, &num_configs);
+    if (!num_configs || ret != EGL_TRUE)
+      throw std::runtime_error("eglChooseConfig failed");
+
+    ret = eglBindAPI(EGL_OPENGL_ES_API);
+    if (ret != EGL_TRUE)
+      throw std::runtime_error("eglBindAPI failed");
+
+    // clang-format off
+		EGLint ctx_attribs[] {
+			EGL_CONTEXT_CLIENT_VERSION, 2,
+			EGL_NONE,
+		};
+    // clang-format on
+
+    m_egl.context =
+        eglCreateContext(m_egl.display, m_egl.config, nullptr, ctx_attribs);
+    if (m_egl.context == EGL_NO_CONTEXT)
+      throw std::runtime_error("eglCreateContext failed");
+
+    EGLint pb_attribs[]{EGL_WIDTH, 1, EGL_HEIGHT, 1, EGL_NONE};
+    EGLSurface pb =
+        eglCreatePbufferSurface(m_egl.display, m_egl.config, pb_attribs);
+    if (pb == EGL_NO_SURFACE)
+      throw std::runtime_error("eglCreatePbufferSurface failed");
+
+    if (eglMakeCurrent(m_egl.display, pb, pb, m_egl.context) != EGL_TRUE)
+      throw std::runtime_error("eglMakeCurrent failed");
+
+    std::println("GL ES version: {}",
+                 reinterpret_cast<const char *>(glGetString(GL_VERSION)));
+  }
+
+  { // Wayland part 2: Electric boogaloo
+    m_wayland.shm = std::make_unique<Shm>(m_wayland.display);
+
+    m_wayland.subcompositor = subcompositor_create(m_wayland.display);
+    if (!m_wayland.subcompositor)
+      throw std::runtime_error("Failed to create subcompositor");
+  }
+}
+
+LunarWM::~LunarWM() {
+  { // Wayland second initialization block
+    if (m_wayland.subcompositor)
+      wl_global_destroy(m_wayland.subcompositor);
+    if (m_wayland.shm)
+      m_wayland.shm.reset();
+  }
+  { // EGL
+    if (m_egl.display != EGL_NO_DISPLAY)
+      eglDestroyContext(m_egl.display, m_egl.context);
+  }
+  { // Wayland
+    if (m_wayland.display)
+      wl_display_destroy(m_wayland.display);
+  }
+  std::println("bai bai~!");
+}
+
+void LunarWM::run() {
+  std::println("Running wayland compositor on WAYLAND_DISPLAY={}.",
+               m_wayland.socket);
+
+  while (m_running) {
+    if (wl_event_loop_dispatch(m_wayland.event_loop, 0) < 0) {
+      break;
+    }
+    wl_display_flush_clients(m_wayland.display);
+  }
+}
+
+void LunarWM::terminate() { m_running = false; }
+
+} // namespace LunarWM

src/main.cpp

@@ -0,0 +1,12 @@
+#include <csignal>
+#include <memory>
+
+import LunarWM.LunarWM;
+
+std::unique_ptr<LunarWM::LunarWM> g_comp;
+
+int main(void) {
+  g_comp = std::make_unique<LunarWM::LunarWM>();
+  std::signal(SIGINT, [](int) { g_comp->terminate(); });
+  g_comp->run();
+}

src/wl/Shm.cppm

@@ -0,0 +1,238 @@
+module;
+
+#include <cerrno>
+#include <cstring>
+#include <stdexcept>
+
+#include <wayland-server.h>
+
+#include <GLES2/gl2.h>
+
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+export module LunarWM.wl.Shm;
+
+namespace LunarWM {
+
+export struct Shm {
+  Shm(wl_display *display);
+  ~Shm();
+
+  wl_global *global = nullptr;
+};
+
+} // namespace LunarWM
+
+namespace {
+
+using LunarWM::Shm;
+
+struct Pool {
+  wl_resource *res = nullptr;
+  Shm *shm = nullptr;
+  void *data = nullptr;
+  size_t size = 0;
+  unsigned refs = 1;
+};
+
+inline void unref_pool(Pool *p) {
+  if (--p->refs == 0) {
+    if (p->data && p->data != MAP_FAILED)
+      ::munmap(p->data, p->size);
+    delete p;
+  }
+}
+
+struct Buffer {
+  wl_resource *res = nullptr;
+  Pool *pool = nullptr;
+  GLuint tex = 0;
+  int32_t w = 0;
+  int32_t h = 0;
+  int32_t stride = 0;
+  uint32_t fmt = WL_SHM_FORMAT_ARGB8888;
+  int32_t off = 0;
+
+  void *pixels() const { return static_cast<uint8_t *>(pool->data) + off; }
+};
+
+#ifdef __NetBSD__
+void *remap(void *oldp, size_t oldsz, size_t newsz) {
+  return ::mremap(oldp, oldsz, nullptr, newsz, 0);
+}
+#else
+void *remap(void *oldp, size_t oldsz, size_t newsz) {
+  return ::mremap(oldp, oldsz, newsz, MREMAP_MAYMOVE);
+}
+#endif
+
+void buf_req_destroy(wl_client *, wl_resource *r) { ::wl_resource_destroy(r); }
+
+void buf_resource_destroy(wl_resource *r) {
+  auto *b = static_cast<Buffer *>(::wl_resource_get_user_data(r));
+
+  if (b->tex)
+    ::glDeleteTextures(1, &b->tex);
+
+  unref_pool(b->pool);
+  delete b;
+}
+
+const struct wl_buffer_interface buffer_impl{.destroy = buf_req_destroy};
+
+void pool_req_destroy(wl_client *, wl_resource *r) { ::wl_resource_destroy(r); }
+
+void pool_resource_destroy(wl_resource *r) {
+  auto *p = static_cast<Pool *>(::wl_resource_get_user_data(r));
+  unref_pool(p);
+}
+
+void pool_req_resize(wl_client *, wl_resource *r, int32_t new_sz) {
+  auto *p = static_cast<Pool *>(::wl_resource_get_user_data(r));
+
+  void *d = remap(p->data, p->size, new_sz);
+  if (d == MAP_FAILED) {
+    ::wl_resource_post_error(r, WL_SHM_ERROR_INVALID_FD, "mremap failed: %s",
+                             ::strerror(errno));
+    return;
+  }
+  p->data = d;
+  p->size = new_sz;
+}
+
+void pool_req_create_buf(wl_client *client, wl_resource *pool_res, uint32_t id,
+                         int32_t off, int32_t w, int32_t h, int32_t stride,
+                         uint32_t fmt) {
+  auto *p = static_cast<Pool *>(::wl_resource_get_user_data(pool_res));
+
+  if (off < 0 || static_cast<size_t>(off) > p->size) {
+    ::wl_resource_post_error(pool_res, WL_SHM_ERROR_INVALID_STRIDE,
+                             "offset out of bounds");
+    return;
+  }
+
+  auto *b = new Buffer{};
+  if (!b) {
+    ::wl_resource_post_no_memory(pool_res);
+    return;
+  }
+
+  b->pool = p;
+  b->w = w;
+  b->h = h;
+  b->stride = stride;
+  b->fmt = fmt;
+  b->off = off;
+  ++p->refs;
+
+  b->res = ::wl_resource_create(client, &wl_buffer_interface, 1, id);
+  if (!b->res) {
+    ::wl_resource_post_no_memory(pool_res);
+    unref_pool(p);
+    delete b;
+    return;
+  }
+  ::wl_resource_set_implementation(b->res, &buffer_impl, b,
+                                   &buf_resource_destroy);
+
+  ::glGenTextures(1, &b->tex);
+  ::glBindTexture(GL_TEXTURE_2D, b->tex);
+  ::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  ::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+  ::glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+
+#ifndef GL_BGRA_EXT
+#define GL_BGRA_EXT 0x80E1
+#endif
+
+  GLenum pfmt = (fmt == WL_SHM_FORMAT_XRGB8888 || fmt == WL_SHM_FORMAT_ARGB8888)
+                    ? GL_BGRA_EXT
+                    : GL_RGBA; // fallback
+
+  ::glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, pfmt, GL_UNSIGNED_BYTE,
+                 b->pixels());
+}
+
+const struct wl_shm_pool_interface shm_pool_impl{
+    .create_buffer = pool_req_create_buf,
+    .destroy = pool_req_destroy,
+    .resize = pool_req_resize,
+};
+
+void create_pool(wl_client *client, wl_resource *res, uint32_t id, int32_t fd,
+                 int32_t size) {
+  auto *shm = static_cast<Shm *>(::wl_resource_get_user_data(res));
+
+  auto *p = new Pool{};
+  if (!p) {
+    ::wl_resource_post_no_memory(res);
+    ::close(fd);
+    return;
+  }
+
+  p->shm = shm;
+
+  p->res = ::wl_resource_create(client, &wl_shm_pool_interface,
+                                ::wl_resource_get_version(res), id);
+  if (!p->res) {
+    ::wl_resource_post_no_memory(res);
+    delete p;
+    ::close(fd);
+    return;
+  }
+
+  ::wl_resource_set_implementation(p->res, &shm_pool_impl, p,
+                                   &pool_resource_destroy);
+
+  p->data = ::mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+  if (p->data == MAP_FAILED) {
+    ::wl_resource_post_error(res, WL_SHM_ERROR_INVALID_FD, "mmap failed: %s",
+                             ::strerror(errno));
+    ::wl_resource_destroy(p->res);
+    delete p;
+    ::close(fd);
+    return;
+  }
+
+  p->size = size;
+  ::close(fd);
+}
+
+const struct wl_shm_interface shm_impl{
+    .create_pool = create_pool,
+};
+
+void bind_shm(wl_client *client, void *data, uint32_t version, uint32_t id) {
+  auto *shm = static_cast<Shm *>(data);
+
+  wl_resource *r = ::wl_resource_create(client, &wl_shm_interface, version, id);
+  if (!r) {
+    ::wl_client_post_no_memory(client);
+    return;
+  }
+
+  ::wl_resource_set_implementation(r, &shm_impl, shm, nullptr);
+
+  ::wl_shm_send_format(r, WL_SHM_FORMAT_XRGB8888);
+  ::wl_shm_send_format(r, WL_SHM_FORMAT_ARGB8888);
+}
+
+} // namespace
+
+namespace LunarWM {
+
+Shm::Shm(wl_display *display) {
+  this->global =
+      ::wl_global_create(display, &wl_shm_interface, 1, this, &bind_shm);
+  if (!this->global)
+    throw std::runtime_error("wl_global_create failed");
+}
+
+Shm::~Shm() {
+  if (this->global)
+    ::wl_global_destroy(this->global);
+}
+
+} // namespace LunarWM

src/wl/Subcompositor.cppm

@@ -0,0 +1,47 @@
+module;
+
+#include "util.h"
+
+#include <wayland-server.h>
+
+export module LunarWM.wl.Subcompositor;
+
+import LunarWM.wl.Subsurface;
+
+namespace LunarWM {
+
+export wl_global *subcompositor_create(struct wl_display *display);
+
+void get_subsurface(wl_client *client, wl_resource *res, uint32_t id,
+                    wl_resource *surface, wl_resource *parent) {
+  auto subsurface = Subsurface::make(client, wl_resource_get_version(res), id);
+  if (!subsurface) {
+    wl_resource_post_no_memory(res);
+    return;
+  }
+}
+
+struct wl_subcompositor_interface const subcompositor_impl = {
+    .destroy = resource_destroy,
+    .get_subsurface = get_subsurface,
+};
+
+void bind_subcompositor(wl_client *client, void *data, uint32_t version,
+                        uint32_t id) {
+  struct wl_resource *resource;
+
+  resource =
+      wl_resource_create(client, &wl_subcompositor_interface, version, id);
+  if (!resource) {
+    wl_client_post_no_memory(client);
+    return;
+  }
+  wl_resource_set_implementation(resource, &subcompositor_impl, NULL, NULL);
+}
+
+wl_global *subcompositor_create(struct wl_display *display) {
+  return wl_global_create(display, &wl_subcompositor_interface, 1, NULL,
+                          &bind_subcompositor);
+}
+
+} // namespace LunarWM

src/wl/Subsurface.cppm

@@ -0,0 +1,73 @@
+module;
+
+#include "util.h"
+
+#include <stdexcept>
+
+#include <wayland-server.h>
+
+export module LunarWM.wl.Subsurface;
+
+namespace LunarWM {
+
+export struct Subsurface {
+  Subsurface() = delete;
+
+  static Subsurface *make(wl_client *client, uint32_t version, uint32_t id);
+  static void destroy(wl_resource *res);
+
+  struct wl_resource *resource;
+};
+
+void set_position(wl_client *client, wl_resource *resource, int32_t x,
+                  int32_t y) {
+  // TODO: Implement.
+}
+
+void place_above(wl_client *client, wl_resource *resource,
+                 wl_resource *sibling_resource) {
+  // TODO: Implement.
+}
+
+void place_below(wl_client *client, wl_resource *resource,
+                 wl_resource *sibling_resource) {
+  // TODO: Implement.
+}
+
+void set_sync(wl_client *client, wl_resource *resource) {
+  // TODO: Implement.
+}
+
+void set_desync(wl_client *client, wl_resource *resource) {
+  // TODO: Implement.
+}
+
+struct wl_subsurface_interface const subsurface_impl{
+    .destroy = resource_destroy,
+    .set_position = set_position,
+    .place_above = place_above,
+    .place_below = place_below,
+    .set_sync = set_sync,
+    .set_desync = set_desync,
+};
+
+void Subsurface::destroy(wl_resource *res) {
+  free(wl_resource_get_user_data(res));
+}
+
+Subsurface *Subsurface::make(wl_client *client, uint32_t version, uint32_t id) {
+  Subsurface *subsurface =
+      reinterpret_cast<Subsurface *>(malloc(sizeof(Subsurface)));
+  subsurface->resource =
+      wl_resource_create(client, &wl_subsurface_interface, version, id);
+  if (!subsurface->resource) {
+    free(subsurface);
+    throw std::runtime_error("wl_resource_create(subsurface) failed");
+  }
+
+  wl_resource_set_implementation(subsurface->resource, &subsurface_impl,
+                                 subsurface, &Subsurface::destroy);
+  return subsurface;
+}
+
+} // namespace LunarWM

src/wl/util.h

@@ -0,0 +1,6 @@
+#include <wayland-server.h>
+
+static void resource_destroy(struct wl_client *client,
+                             struct wl_resource *resource) {
+  wl_resource_destroy(resource);
+}