Preparations for supporting wayland

Signed-off-by: falkTX <falktx@falktx.com>

dgl/Application.hpp

@@ -87,6 +87,7 @@ public:
       Type of application to setup, either "classic" or "modern".
 
       What this means depends on the OS.
+      For now it's only relevant on X11 vs Wayland systems, where X11 is kTypeClassic and Wayland is kTypeModern.
     */
     enum Type {
         kTypeAuto,

dgl/src/ApplicationPrivateData.cpp

@@ -44,6 +44,16 @@ static bool isThisTheMainThread(const d_ThreadHandle mainThreadHandle) noexcept
    #endif
 }
 
+static constexpr inline uint32_t AppTypePuglWorldFlags(const Application::Type type) noexcept
+{
+   #ifdef DGL_USING_X11_OR_WAYLAND
+    return type == Application::kTypeClassic ? PUGL_WORLD_BACKEND_X11 :
+           type == Application::kTypeModern ? PUGL_WORLD_BACKEND_WAYLAND : 0;
+   #else
+    return 0 & type;
+   #endif
+}
+
 // --------------------------------------------------------------------------------------------------------------------
 
 const char* Application::getClassName() const noexcept
@@ -55,8 +65,12 @@ const char* Application::getClassName() const noexcept
 
 Application::PrivateData::PrivateData(const bool standalone, const Type type)
     : world(puglNewWorld(standalone ? PUGL_PROGRAM : PUGL_MODULE,
-                         (standalone ? PUGL_WORLD_THREADS : 0))),
+                         (standalone ? PUGL_WORLD_THREADS : 0) | AppTypePuglWorldFlags(type))),
+     #ifdef DGL_USING_X11_OR_WAYLAND
+      isModern(world != nullptr && puglUsingWayland(world)),
+     #else
       isModern(false),
+     #endif
       isStandalone(standalone),
       isStarting(true),
       isQuitting(false),

dgl/src/pugl.cpp

@@ -571,7 +571,19 @@ void puglWin32ShowCentered(PuglView* const view)
 
 // --------------------------------------------------------------------------------------------------------------------
 
-#elif defined(HAVE_X11)
+#elif defined(DGL_USING_X11_OR_WAYLAND)
+
+// --------------------------------------------------------------------------------------------------------------------
+// X11 or Wayland specific, check if using wayland
+
+bool puglUsingWayland(PuglWorld* const world)
+{
+    // TODO
+    (void)world;
+    return false;
+}
+
+#ifdef HAVE_X11
 
 // --------------------------------------------------------------------------------------------------------------------
 // X11 specific, update world without triggering exposure events
@@ -638,9 +650,25 @@ void puglX11SetWindowType(const PuglView* const view, const bool isStandalone)
                     numWindowTypes);
 }
 
+#endif // HAVE_X11
+
+#ifdef HAVE_WAYLAND
+
+// --------------------------------------------------------------------------------------------------------------------
+// Wayland specific, check if running wayland and if compositor supports decorations
+
+bool puglWaylandStatus(bool* supportsDecorations)
+{
+    // TODO
+    (void)supportsDecorations;
+    return false;
+}
+
+#endif // HAVE_WAYLAND
+
 // --------------------------------------------------------------------------------------------------------------------
 
-#endif // HAVE_X11
+#endif
 
 #ifndef DISTRHO_OS_MAC
 END_NAMESPACE_DGL

dgl/src/pugl.hpp

@@ -111,8 +111,18 @@ void puglWin32RestoreWindow(PuglView* view);
 // win32 specific, center view based on parent coordinates (if there is one)
 void puglWin32ShowCentered(PuglView* view);
 
-#elif defined(HAVE_X11)
+#elif defined(HAVE_X11) || defined(HAVE_WAYLAND)
 
+#define DGL_USING_X11_OR_WAYLAND
+
+// custom flags for world creation
+#define PUGL_WORLD_BACKEND_X11     0x1000
+#define PUGL_WORLD_BACKEND_WAYLAND 0x2000
+
+// X11 or Wayland specific, check if using wayland
+bool puglUsingWayland(PuglWorld* world);
+
+#ifdef HAVE_X11
 #define DGL_USING_X11
 
 // X11 specific, update world without triggering exposure events
@@ -120,6 +130,14 @@ PuglStatus puglX11UpdateWithoutExposures(PuglWorld* world);
 
 // X11 specific, set dialog window type
 void puglX11SetWindowType(const PuglView* view, bool isStandalone);
+#endif
+
+#ifdef HAVE_WAYLAND
+#define DGL_USING_WAYLAND
+
+// Wayland specific, return if running wayland and check if compositor supports decorations
+bool puglWaylandStatus(bool* supportsDecorations);
+#endif
 
 #endif