Add initial Wayland support

The window lacks the expected decoration in GNOME since we use glfw
3.3.6 and libdecor support was added 3.3.9.

This does not work well with high-DPI monitors. The window is made
larger than the framebuffer.

CMakeLists.txt

@@ -196,6 +196,9 @@ if (NOT PPX_ANDROID)
     set(GLFW_BUILD_TESTS    FALSE CACHE BOOL "" FORCE)
     set(GLFW_BUILD_DOCS     FALSE CACHE BOOL "" FORCE)
     set(GLFW_VULKAN_STATIC  FALSE CACHE BOOL "" FORCE)
+    if (PPX_LINUX_WAYLAND)
+        set(GLFW_USE_WAYLAND TRUE CACHE BOOL "" FORCE)
+    endif()
     add_subdirectory(${PPX_THIRD_PARTY_DIR}/glfw)
 endif()
 

docs/building_and_running.md

@@ -39,6 +39,12 @@ Install the following prerequisite packages before building:
 sudo apt install libxrandr-dev libxinerama-dev libx11-dev libxcursor-dev libxi-dev libx11-xcb-dev clang mesa-vulkan-drivers cmake ninja-build
 ```
 
+If building for Wayland, also install:
+
+```
+sudo apt install libwayland-dev wayland-protocols libxkbcommon-dev extra-cmake-modules
+```
+
 ## Linux
 ```
 git clone --recursive https://github.com/google/bigwheels
@@ -49,6 +55,8 @@ ninja -C build
 
 Built binaries are written to `build/bin/`.
 
+If building for Wayland, run CMake with `-DPPX_LINUX_WAYLAND=1`.
+
 ## Windows
 
 - Make sure the "Graphics Tools" feature is enabled (Settings > System > "Optional features" > "Add a feature" > "Graphics Tools". This is required to have DX12 debug layers.

src/ppx/grfx/vk/vk_instance.cpp

@@ -182,7 +182,7 @@ Result Instance::ConfigureLayersAndExtensions(const grfx::InstanceCreateInfo* pC
 #elif defined(PPX_LINUX_XLIB)
 #error "Xlib not implemented"
 #elif defined(PPX_LINUX_WAYLAND)
-#error "Wayland not implemented"
+        mExtensions.push_back(VK_KHR_WAYLAND_SURFACE_EXTENSION_NAME);
 #elif defined(PPX_MSW)
         mExtensions.push_back(VK_KHR_WIN32_SURFACE_EXTENSION_NAME);
 #endif

src/ppx/grfx/vk/vk_swapchain.cpp

@@ -56,7 +56,15 @@ Result Surface::CreateApiObjects(const grfx::SurfaceCreateInfo* pCreateInfo)
 #elif defined(PPX_LINUX_XLIB)
 #error "Xlib not implemented"
 #elif defined(PPX_LINUX_WAYLAND)
-#error "Wayland not implemented"
+    VkWaylandSurfaceCreateInfoKHR vkci = {VK_STRUCTURE_TYPE_WAYLAND_SURFACE_CREATE_INFO_KHR};
+    vkci.display                       = pCreateInfo->display;
+    vkci.surface                       = pCreateInfo->surface;
+
+    vkres = vkCreateWaylandSurfaceKHR(
+        ToApi(GetInstance())->GetVkInstance(),
+        &vkci,
+        nullptr,
+        &mSurface);
 #elif defined(PPX_MSW)
     VkWin32SurfaceCreateInfoKHR vkci = {VK_STRUCTURE_TYPE_WIN32_SURFACE_CREATE_INFO_KHR};
     vkci.hinstance                   = pCreateInfo->hinstance;

src/ppx/window_glfw.cpp

@@ -27,15 +27,17 @@
 #elif defined(PPX_LINUX_XLIB)
 #error "Xlib not implemented"
 #elif defined(PPX_LINUX_WAYLAND)
-#error "Wayland not implemented"
+#include <wayland-client.h>
 #endif
 
 #include <GLFW/glfw3.h>
 // clang-format off
-#if defined(PPX_LINUX)
+#if defined(PPX_LINUX_XCB)
 #   define GLFW_EXPOSE_NATIVE_X11
 #elif defined(PPX_MSW)
 #   define GLFW_EXPOSE_NATIVE_WIN32
+#elif defined(PPX_LINUX_WAYLAND)
+#   define GLFW_EXPOSE_NATIVE_WAYLAND
 #endif
 #include <GLFW/glfw3native.h>
 // clang-format on
@@ -484,7 +486,8 @@ void WindowImplGLFW::FillSurfaceInfo(grfx::SurfaceCreateInfo* pCreateInfo) const
 #elif defined(PPX_LINUX_XLIB)
 #error "Xlib not implemented"
 #elif defined(PPX_LINUX_WAYLAND)
-#error "Wayland not implemented"
+    pCreateInfo->display = glfwGetWaylandDisplay();
+    pCreateInfo->surface = glfwGetWaylandWindow(mNative);
 #elif defined(PPX_MSW)
     pCreateInfo->hinstance = ::GetModuleHandle(nullptr);
     pCreateInfo->hwnd      = glfwGetWin32Window(mNative);