Ask Wayland what monitor outputs are available

sunshine/platform/linux/wayland.cpp

@@ -0,0 +1,143 @@
+#include <wayland-client.h>
+#include <wayland-util.h>
+
+#include <cstdlib>
+
+#include "sunshine/main.h"
+#include "sunshine/platform/common.h"
+#include "sunshine/utility.h"
+#include "wayland.h"
+
+extern const wl_interface wl_output_interface;
+
+using namespace std::literals;
+
+// Disable warning for converting incompatible functions
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
+
+namespace wl {
+void test() {
+  display_t display;
+
+  if(display.init()) {
+    return;
+  }
+
+  interface_t interface { display.registry() };
+
+  display.roundtrip();
+
+  for(auto &monitor : interface.monitors) {
+    monitor->listen(interface.output_manager);
+  }
+
+  display.roundtrip();
+}
+
+int display_t::init(const char *display_name) {
+  if(!display_name) {
+    display_name = std::getenv("WAYLAND_DISPLAY");
+  }
+
+  if(!display_name) {
+    BOOST_LOG(error) << "Environment variable WAYLAND_DISPLAY has not been defined"sv;
+    return -1;
+  }
+
+  display_internal.reset(wl_display_connect(display_name));
+  if(!display_internal) {
+    BOOST_LOG(error) << "Couldn't connect to Wayland display: "sv << display_name;
+    return -1;
+  }
+
+  BOOST_LOG(info) << "Found display ["sv << display_name << ']';
+
+  return 0;
+}
+
+void display_t::roundtrip() {
+  wl_display_roundtrip(display_internal.get());
+}
+
+wl_registry *display_t::registry() {
+  return wl_display_get_registry(display_internal.get());
+}
+
+inline monitor_t::monitor_t(wl_output *output) : output { output } {}
+
+inline void monitor_t::xdg_name(zxdg_output_v1 *, const char *name) {
+  this->name = name;
+
+  BOOST_LOG(info) << "Name: "sv << this->name;
+}
+
+inline void monitor_t::xdg_description(zxdg_output_v1 *, const char *description) {
+  this->description = description;
+
+  BOOST_LOG(info) << "Found monitor: "sv << this->description;
+}
+
+inline void monitor_t::xdg_position(zxdg_output_v1 *, std::int32_t x, std::int32_t y) {
+  viewport.offset_x = x;
+  viewport.offset_y = y;
+
+  BOOST_LOG(info) << "Offset: "sv << x << 'x' << y;
+}
+
+inline void monitor_t::xdg_size(zxdg_output_v1 *, std::int32_t width, std::int32_t height) {
+  viewport.width  = width;
+  viewport.height = height;
+
+  BOOST_LOG(info) << "Resolution: "sv << width << 'x' << height;
+}
+
+inline void monitor_t::xdg_done(zxdg_output_v1 *) {
+  BOOST_LOG(info) << "All info about monitor ["sv << name << "] has been send"sv;
+}
+
+inline void monitor_t::listen(zxdg_output_manager_v1 *output_manager) {
+  auto xdg_output = zxdg_output_manager_v1_get_xdg_output(output_manager, output);
+
+#define CLASS_CALL(x, y) x = (decltype(x))&y
+
+  CLASS_CALL(listener.name, monitor_t::xdg_name);
+  CLASS_CALL(listener.logical_size, monitor_t::xdg_size);
+  CLASS_CALL(listener.logical_position, monitor_t::xdg_position);
+  CLASS_CALL(listener.done, monitor_t::xdg_done);
+  CLASS_CALL(listener.description, monitor_t::xdg_description);
+
+#undef CLASS_CALL
+  zxdg_output_v1_add_listener(xdg_output, &listener, this);
+}
+
+inline interface_t::interface_t(wl_registry *registry)
+    : output_manager { nullptr }, listener {
+        (decltype(wl_registry_listener::global))&interface_t::add_interface,
+        (decltype(wl_registry_listener::global_remove))&interface_t::del_interface,
+      } {
+  wl_registry_add_listener(registry, &listener, this);
+}
+
+inline void interface_t::add_interface(wl_registry *registry, std::uint32_t id, const char *interface, std::uint32_t version) {
+  BOOST_LOG(debug) << "Available interface: "sv << interface << '(' << id << ") version "sv << version;
+
+  if(!std::strcmp(interface, wl_output_interface.name)) {
+    BOOST_LOG(info) << "Found interface: "sv << interface << '(' << id << ") version "sv << version;
+    monitors.emplace_back(
+      std::make_unique<monitor_t>(
+        (wl_output *)wl_registry_bind(registry, id, &wl_output_interface, version)));
+  }
+  else if(!std::strcmp(interface, zxdg_output_manager_v1_interface.name)) {
+    BOOST_LOG(info) << "Found interface: "sv << interface << '(' << id << ") version "sv << version;
+    output_manager = (zxdg_output_manager_v1 *)wl_registry_bind(registry, id, &zxdg_output_manager_v1_interface, version);
+  }
+}
+
+inline void interface_t::del_interface(wl_registry *registry, uint32_t id) {
+  BOOST_LOG(info) << "Delete: "sv << id;
+}
+
+} // namespace wl
+
+#pragma GCC diagnostic pop

sunshine/platform/linux/wayland.h

@@ -0,0 +1,84 @@
+#ifndef SUNSHINE_WAYLAND_H
+#define SUNSHINE_WAYLAND_H
+
+#include <xdg-output-unstable-v1.h>
+
+namespace wl {
+using display_internal_t = util::safe_ptr<wl_display, wl_display_disconnect>;
+
+class monitor_t {
+public:
+  monitor_t(monitor_t &&)      = delete;
+  monitor_t(const monitor_t &) = delete;
+
+  monitor_t &operator=(const monitor_t &) = delete;
+  monitor_t &operator=(monitor_t &&) = delete;
+
+  monitor_t(wl_output *output);
+
+  void xdg_name(zxdg_output_v1 *, const char *name);
+  void xdg_description(zxdg_output_v1 *, const char *description);
+  void xdg_position(zxdg_output_v1 *, std::int32_t x, std::int32_t y);
+  void xdg_size(zxdg_output_v1 *, std::int32_t width, std::int32_t height);
+  void xdg_done(zxdg_output_v1 *);
+
+  void listen(zxdg_output_manager_v1 *output_manager);
+
+  wl_output *output;
+
+  std::string name;
+  std::string description;
+
+  platf::touch_port_t viewport;
+
+  zxdg_output_v1_listener listener;
+};
+
+class interface_t {
+  struct bind_t {
+    std::uint32_t id;
+    std::uint32_t version;
+  };
+
+public:
+  interface_t(interface_t &&)      = delete;
+  interface_t(const interface_t &) = delete;
+
+  interface_t &operator=(const interface_t &) = delete;
+  interface_t &operator=(interface_t &&) = delete;
+
+  interface_t(wl_registry *registry);
+
+  std::vector<std::unique_ptr<monitor_t>> monitors;
+  zxdg_output_manager_v1 *output_manager;
+
+private:
+  void add_interface(wl_registry *registry, std::uint32_t id, const char *interface, std::uint32_t version);
+  void del_interface(wl_registry *registry, uint32_t id);
+
+  wl_registry_listener listener;
+};
+
+class display_t {
+public:
+  /**
+   * Initialize display with display_name
+   * If display_name == nullptr -> display_name = std::getenv("WAYLAND_DISPLAY")
+   */
+  int init(const char *display_name = nullptr);
+
+  // Roundtrip with Wayland connection
+  void roundtrip();
+
+  // Get the registry associated with the display
+  // No need to manually free the registry
+  wl_registry *registry();
+
+private:
+  display_internal_t display_internal;
+};
+
+void test();
+} // namespace wl
+
+#endif