SDL3: Try to centre window and fix compiling error

misc/ClassicalSharp/known_bugs.txt

@@ -1,21 +0,0 @@
-* Blocks over 256 are not saved or loaded at all.
-* Custom block information for blocks over 256 is not saved or loaded at all.
-* /hold 0 prevents you deleting blocks until you change to another.
-* Sometimes when holding air and your own model is a block model, you crash.
-* Labels and buttons overlap in launcher with some fonts. (e.g. Lucida Console)
-* terrain.png with width under 16 insta-crash the game
-* catbox.moe texture packs/terrain.png links insta-crash the game
-* Sometimes you randomly crash reading leveldatachunk packet on OSX
-* Models with size of over 2 are not supported at all
-* Direct3D9 backend uses an ill-formed vertex format that works by accident
-* Alt text doesn't update its Y position if you click on chat 
-* Menu inputs (save, edit hotkey, water level, etc) are reset on window resize
-* Chat input caret is reset on window resize
-* Position in chat (if you scrolled up into history) is reset on window resize
-* Two blank lines get shown in chat when you type /client cuboid
-* Alt text is closed on window resize
-* Changing server texture packs sometimes still retains textures from previous one
-* Crashes at startup when another process has exclusively acquired Direct3D9 device
-* Can't bind controls to mouse buttons
-* Does not work at all on 64 bit macOS
-* Making a gas block undeletable doesn't prevent placing blocks over it

misc/ClassicalSharp/readme.txt

@@ -1,5 +0,0 @@
-Here lies ClassicalSharp, the original C# client. (works with Mono and .NET framework 2.0)
-It has unfixed bugs and missing features. There's no reason to use it anymore.
-
-For licensing, please see license.txt inside ClassicalSharp.zip.
-Absolutely no support or assistance will be provided for ClassicalSharp.

src/Window_SDL.c

@@ -1,5 +1,5 @@
 #include "Core.h"
-#if defined CC_BUILD_SDL
+#if defined CC_BUILD_SDL2
 #include "_WindowBase.h"
 #include "Graphics.h"
 #include "String.h"
@@ -9,7 +9,7 @@
 #include <SDL2/SDL.h>
 static SDL_Window* win_handle;
 
-#warning "Some features are missing from the SDL backend. If possible, it is recommended that you use a native windowing backend instead"
+#warning "Some features are missing from the SDL2 backend. If possible, it is recommended that you use a native windowing backend instead"
 
 static void RefreshWindowBounds(void) {
 	SDL_GetWindowSize(win_handle, &Window_Main.Width, &Window_Main.Height);
@@ -41,10 +41,7 @@ void Window_Init(void) {
 void Window_Free(void) { }
 
 static void DoCreateWindow(int width, int height, int flags) {
-	int x = Display_CentreX(width);
-	int y = Display_CentreY(height);
-
-	win_handle = SDL_CreateWindow(NULL, x, y, width, height, 
+	win_handle = SDL_CreateWindow(NULL, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, width, height, 
 					flags | SDL_WINDOW_RESIZABLE);
 	if (!win_handle) Window_SDLFail("creating window");
 

src/Window_SDL3.c

@@ -10,8 +10,6 @@
 static SDL_Window* win_handle;
 static Uint32 dlg_event;
 
-#warning "Some features are missing from the SDL3 backend. If possible, it is recommended that you use a native windowing backend instead"
-
 static void RefreshWindowBounds(void) {
 	SDL_GetWindowSize(win_handle, &Window_Main.Width, &Window_Main.Height);
 }
@@ -29,7 +27,7 @@ static void Window_SDLFail(const char* place) {
 void Window_Init(void) {
 	SDL_Init(SDL_INIT_VIDEO);
 	#ifdef CC_BUILD_FLATPAK
-	 SDL_SetHint(SDL_HINT_APP_ID, "net.classicube.flatpak.client");
+	SDL_SetHint(SDL_HINT_APP_ID, "net.classicube.flatpak.client");
 	#endif
 	int displayID = SDL_GetPrimaryDisplay();
 	Input.Sources = INPUT_SOURCE_NORMAL;
@@ -47,9 +45,16 @@ void Window_Init(void) {
 void Window_Free(void) { }
 
 static void DoCreateWindow(int width, int height, int flags) {
-	win_handle = SDL_CreateWindow(NULL, width, height, 
-					flags | SDL_WINDOW_RESIZABLE);
+	SDL_PropertiesID props = SDL_CreateProperties();
+	SDL_SetNumberProperty(props, SDL_PROP_WINDOW_CREATE_X_NUMBER, SDL_WINDOWPOS_CENTERED);
+	SDL_SetNumberProperty(props, SDL_PROP_WINDOW_CREATE_Y_NUMBER, SDL_WINDOWPOS_CENTERED);
+	SDL_SetNumberProperty(props, SDL_PROP_WINDOW_CREATE_WIDTH_NUMBER,  width);
+	SDL_SetNumberProperty(props, SDL_PROP_WINDOW_CREATE_HEIGHT_NUMBER, height);
+	SDL_SetNumberProperty(props, "flags", flags | SDL_WINDOW_RESIZABLE);
+
+	win_handle = SDL_CreateWindowWithProperties(props);
 	if (!win_handle) Window_SDLFail("creating window");
+	SDL_DestroyProperties(props);
 
 	RefreshWindowBounds();
 	Window_Main.Exists = true;
@@ -100,7 +105,9 @@ int Window_IsObscured(void) {
 	return flags & SDL_WINDOW_OCCLUDED;
 }
 
-void Window_Show(void) { SDL_ShowWindow(win_handle); }
+void Window_Show(void) {
+	 SDL_ShowWindow(win_handle); 
+}
 
 void Window_SetSize(int width, int height) {
 	SDL_SetWindowSize(win_handle, width, height);
@@ -199,7 +206,7 @@ static void OnTextEvent(const SDL_Event* e) {
 	int i, len;
 
 	src = e->text.text;
-	len = String_CalcLen(src, SDL_TEXTINPUTEVENT_TEXT_SIZE);
+	len = String_Length(src);
 
 	while (len > 0) {
 		i = Convert_Utf8ToCodepoint(&cp, src, len);