Mobile: use SDL_IsTablet() to determine the device type

* cherry picked from commit
  1c1acc3cfb
* this commit define automatically the client mode, if tabled or not!
  is goot to be backported to final minetest
* this depends of the previous commit, so now phone devices and tables
  are buil using SDL, check commit bd244fb402ee965862f42455d18857d7453f2cac
  in this repository

src/client/game.cpp

@@ -2146,7 +2146,7 @@ void Game::openConsole(float scale, const wchar_t *line)
 		gui_chat_console->setAndroidChatOpen(true);
 	}
 
-	if (!g_settings->getBool("device_is_tablet"))
+	if (!RenderingEngine::isTablet())
 		return;
 #endif
 

src/client/renderingengine.cpp

@@ -791,13 +791,23 @@ v2u32 RenderingEngine::getDisplaySize()
 }
 #endif // __ANDROID__/__IOS__
 
+bool RenderingEngine::isTablet()
+{
+#if defined(_IRR_COMPILE_WITH_SDL_DEVICE_)
+	static const bool isTablet = SDL_IsTablet();
+	return isTablet;
+#else
+	return false;
+#endif
+}
+
 bool RenderingEngine::isHighDpi()
 {
 #if defined(__MACH__) && defined(__APPLE__) && !defined(__IOS__)
 	return g_settings->getFloat("screen_dpi") / 72.0f >= 2;
 #elif defined(__IOS__)
 	float density = RenderingEngine::getDisplayDensity();
-	return g_settings->getBool("device_is_tablet") ? (density >= 2) : (density >= 3);
+	return isTablet() ? (density >= 2) : (density >= 3);
 #else
 	return RenderingEngine::getDisplayDensity() >= 3;
 #endif

src/client/renderingengine.h

@@ -50,6 +50,7 @@ public:
 	static const char *getVideoDriverFriendlyName(irr::video::E_DRIVER_TYPE type);
 	static float getDisplayDensity();
 	static v2u32 getDisplaySize();
+	static bool isTablet();
 	static bool isHighDpi();
 
 	bool setupTopLevelWindow(const std::string &name);

src/defaultsettings.cpp

@@ -26,7 +26,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "mapgen/mapgen.h" // Mapgen::setDefaultSettings
 #include "util/string.h"
 
-#ifdef __ANDROID__
+#ifndef SERVER
 #include "client/renderingengine.h"
 #endif
 
@@ -496,7 +496,9 @@ void set_default_settings()
 	settings->setDefault("screen_dpi", "72");
 	settings->setDefault("display_density_factor", "1");
 
-	settings->setDefault("device_is_tablet", "false");
+#ifndef SERVER
+	settings->setDefault("device_is_tablet", std::to_string(RenderingEngine::isTablet()));
+#endif
 
 	// Altered settings for macOS
 #if defined(__MACH__) && defined(__APPLE__) && !defined(__IOS__)
@@ -540,6 +542,11 @@ void set_default_settings()
 	settings->setDefault("autosave_screensize", "false");
 	settings->setDefault("recent_chat_messages", "6");
 
+	if (RenderingEngine::isTablet()) {
+		settings->setDefault("recent_chat_messages", "8");
+		settings->setDefault("console_message_height", "0.4");
+	}
+
 	// Set the optimal settings depending on the memory size [Android] | model [iOS]
 #ifdef __ANDROID__
 	float memoryMax = porting::getTotalSystemMemory();
@@ -644,10 +651,6 @@ void set_default_settings()
 			// 7" tablets
 			g_settings->setDefault("hud_scaling", "0.9");
 			g_settings->setDefault("selectionbox_width", "6");
-		} else if (x_inches >= 7.0) {
-			settings->setDefault("device_is_tablet", "true");
-			settings->setDefault("recent_chat_messages", "8");
-			settings->setDefault("console_message_height", "0.4");
 		}
 
 		if (x_inches <= 4.5) {
@@ -676,12 +679,6 @@ void set_default_settings()
 
 	settings->setDefault("debug_log_level", "none");
 
-	if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
-		settings->setDefault("device_is_tablet", "true");
-		settings->setDefault("recent_chat_messages", "8");
-		settings->setDefault("console_message_height", "0.4");
-	}
-
 	// Set the size of the elements depending on the screen size
 	if SDVersion4Inch {
 		// 4" iPhone and iPod Touch

src/gui/guiConfirmRegistration.cpp

@@ -101,7 +101,7 @@ void GUIConfirmRegistration::regenerateGui(v2u32 screensize)
 	*/
 	float s = MYMIN(screensize.X / 600.f, screensize.Y / 360.f);
 #if HAVE_TOUCHSCREENGUI
-	s *= g_settings->getBool("device_is_tablet") ? 0.7f : 0.8f;
+	s *= RenderingEngine::isTablet() ? 0.7f : 0.8f;
 #else
 	s *= 0.5f;
 #endif

src/gui/guiEngine.cpp

@@ -530,7 +530,7 @@ void GUIEngine::drawHeader(video::IVideoDriver *driver)
 	core::rect<s32> splashrect(0, 0, splashsize.X, splashsize.Y);
 	splashrect += v2s32((screensize.Width/2)-(splashsize.X/2), 0);
 
-	if (g_settings->getBool("device_is_tablet"))
+	if (RenderingEngine::isTablet())
 		splashrect += v2s32(0, splashsize.Y/4);
 #endif
 

src/gui/guiFormSpecMenu.cpp

@@ -3394,7 +3394,7 @@ void GUIFormSpecMenu::regenerateGui(v2u32 screensize)
 			double prefer_imgsize = padded_screensize.Y / 10 * gui_scaling;
 
 			// Try to fit 13 coordinates on large tablets.
-			if (g_settings->getBool("device_is_tablet"))
+			if (RenderingEngine::isTablet())
 				prefer_imgsize = padded_screensize.Y / 13 * gui_scaling;
 #else
 			// Desktop computers have more space, so try to fit 15 coordinates.

src/gui/guiKeyChangeMenu.cpp

@@ -137,7 +137,7 @@ void GUIKeyChangeMenu::regenerateGui(v2u32 screensize)
 
 	float s = MYMIN(screensize.X / 835.f, screensize.Y / 430.f);
 #if HAVE_TOUCHSCREENGUI
-	s *= g_settings->getBool("device_is_tablet") ? 0.8f : 0.9f;
+	s *= RenderingEngine::isTablet() ? 0.8f : 0.9f;
 #else
 	s *= 0.75f;
 #endif

src/gui/guiVolumeChange.cpp

@@ -90,7 +90,7 @@ void GUIVolumeChange::regenerateGui(v2u32 screensize)
 	*/
 	float s = MYMIN(screensize.X / 380.f, screensize.Y / 180.f);
 #if HAVE_TOUCHSCREENGUI
-	s *= g_settings->getBool("device_is_tablet") ? 0.4f : 0.5f;
+	s *= RenderingEngine::isTablet() ? 0.4f : 0.5f;
 #else
 	s *= 0.35f;
 #endif