libgui: Fixed DisplayMode init; added stub for SDL

doomsday/libs/gui/CMakeLists.txt

@@ -108,7 +108,7 @@ list_remove_matches (SOURCES ".*/displaymode_.*")
 if (NOT DE_ENABLE_DISPLAYMODE)
     list (APPEND SOURCES src/displaymode_dummy.cpp)
 else ()
-    list (APPEND SOURCES src/displaymode_${DE_PLATFORM_SUFFIX})
+    list (APPEND SOURCES src/displaymode_sdl.cpp)
 endif ()
 
 # Ignore mobile-only sources.

doomsday/libs/gui/src/displaymode_sdl.cpp

@@ -0,0 +1,64 @@
+/** @file displaymode_sdl.cpp  DisplayMode backend based on SDL.
+ * @ingroup gl
+ *
+ * @authors Copyright (c) 2018 Jaakko Keränen <jaakko.keranen@iki.fi>
+ *
+ * @par License
+ * LGPL: http://www.gnu.org/licenses/lgpl.html
+ *
+ * <small>This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at your
+ * option) any later version. This program is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
+ * General Public License for more details. You should have received a copy of
+ * the GNU Lesser General Public License along with this program; if not, see:
+ * http://www.gnu.org/licenses</small>
+ */
+
+#include "de/gui/displaymode_native.h"
+#include <de/libcore.h>
+
+#include <SDL_video.h>
+
+void DisplayMode_Native_Init(void)
+{
+}
+
+void DisplayMode_Native_Shutdown(void)
+{
+}
+
+int DisplayMode_Native_Count(void)
+{
+    return 0;
+}
+
+void DisplayMode_Native_GetMode(int index, DisplayMode *mode)
+{
+    DE_UNUSED(index);
+    DE_UNUSED(mode);
+}
+
+void DisplayMode_Native_GetCurrentMode(DisplayMode *mode)
+{
+    DE_UNUSED(mode);
+}
+
+int DisplayMode_Native_Change(DisplayMode const *mode, int shouldCapture)
+{
+    DE_UNUSED(mode);
+    DE_UNUSED(shouldCapture);
+    return true;
+}
+
+void DisplayMode_Native_GetColorTransfer(DisplayColorTransfer *colors)
+{
+    DE_UNUSED(colors);
+}
+
+void DisplayMode_Native_SetColorTransfer(DisplayColorTransfer const *colors)
+{
+    DE_UNUSED(colors);
+}

doomsday/libs/gui/src/guiapp.cpp

@@ -147,6 +147,7 @@ GuiApp::GuiApp(const StringList &args)
     {
         throw Error("GuiApp::GuiApp", "No video displays available");
     }
+    DisplayMode_Init();
 
 //    d->matchLoopRateToDisplayMode();
     d->determineDevicePixelRatio();
@@ -171,7 +172,6 @@ void GuiApp::initSubsystems(SubsystemInitFlags subsystemInitFlags)
     // Apply the overall UI scale factor.
     d->dpiFactor *= config().getd("ui.scaleFactor", 1.0);
 
-    DisplayMode_Init();
     scriptSystem().nativeModule("DisplayMode").set("DPI_FACTOR", d->dpiFactor);
 }