[rcore_desktop_sdl] fix: handle monitor ID correctly on SDL3 (#5290)

SDL3 uses ID when dealing with monitors, unlike SDL2 which uses Index
for the same thing. This problem was already fixed in multiple places
by use of preprocessor branches, so I did the very same thing.

Please, notice that this is a pretty bad solution to this problem,
and I only did it to keep it consistent with the rest of the code.
The more about why it's not correct is mentioned here:
https://github.com/raysan5/raylib/issues/5256#issuecomment-3429156919
Hopefully, someone will refactor it someday :)

Fixes: https://github.com/raysan5/raylib/issues/5256

src/platforms/rcore_desktop_sdl.c

@@ -104,7 +104,6 @@ typedef struct {
     SDL_GameController *gamepad[MAX_GAMEPADS];
     SDL_JoystickID gamepadId[MAX_GAMEPADS]; // Joystick instance ids, they do not start from 0
     SDL_Cursor *cursor;
-    bool cursorRelative;
 } PlatformData;
 
 //----------------------------------------------------------------------------------
@@ -838,7 +837,11 @@ void SetWindowPosition(int x, int y)
 void SetWindowMonitor(int monitor)
 {
     const int monitorCount = SDL_GetNumVideoDisplays();
+#if defined(USING_VERSION_SDL3) // SDL3 Migration: Monitor is an id instead of index now, returns 0 on failure
+    if ((monitor > 0) && (monitor <= monitorCount))
+#else
     if ((monitor >= 0) && (monitor < monitorCount))
+#endif
     {
         // NOTE:
         // 1. SDL started supporting moving exclusive fullscreen windows between displays on SDL3,
@@ -962,7 +965,11 @@ int GetCurrentMonitor(void)
 Vector2 GetMonitorPosition(int monitor)
 {
     const int monitorCount = SDL_GetNumVideoDisplays();
+#if defined(USING_VERSION_SDL3) // SDL3 Migration: Monitor is an id instead of index now, returns 0 on failure
+    if ((monitor > 0) && (monitor <= monitorCount))
+#else
     if ((monitor >= 0) && (monitor < monitorCount))
+#endif
     {
         SDL_Rect displayBounds;
 
@@ -986,7 +993,11 @@ int GetMonitorWidth(int monitor)
     int width = 0;
 
     const int monitorCount = SDL_GetNumVideoDisplays();
+#if defined(USING_VERSION_SDL3) // SDL3 Migration: Monitor is an id instead of index now, returns 0 on failure
+    if ((monitor > 0) && (monitor <= monitorCount))
+#else
     if ((monitor >= 0) && (monitor < monitorCount))
+#endif
     {
         SDL_DisplayMode mode;
         SDL_GetCurrentDisplayMode(monitor, &mode);
@@ -1003,7 +1014,11 @@ int GetMonitorHeight(int monitor)
     int height = 0;
 
     const int monitorCount = SDL_GetNumVideoDisplays();
+#if defined(USING_VERSION_SDL3) // SDL3 Migration: Monitor is an id instead of index now, returns 0 on failure
+    if ((monitor > 0) && (monitor <= monitorCount))
+#else
     if ((monitor >= 0) && (monitor < monitorCount))
+#endif
     {
         SDL_DisplayMode mode;
         SDL_GetCurrentDisplayMode(monitor, &mode);
@@ -1020,7 +1035,11 @@ int GetMonitorPhysicalWidth(int monitor)
     int width = 0;
 
     const int monitorCount = SDL_GetNumVideoDisplays();
+#if defined(USING_VERSION_SDL3) // SDL3 Migration: Monitor is an id instead of index now, returns 0 on failure
+    if ((monitor > 0) && (monitor <= monitorCount))
+#else
     if ((monitor >= 0) && (monitor < monitorCount))
+#endif
     {
         float ddpi = 0.0f;
         SDL_GetDisplayDPI(monitor, &ddpi, NULL, NULL);
@@ -1040,7 +1059,11 @@ int GetMonitorPhysicalHeight(int monitor)
     int height = 0;
 
     const int monitorCount = SDL_GetNumVideoDisplays();
+#if defined(USING_VERSION_SDL3) // SDL3 Migration: Monitor is an id instead of index now, returns 0 on failure
+    if ((monitor > 0) && (monitor <= monitorCount))
+#else
     if ((monitor >= 0) && (monitor < monitorCount))
+#endif
     {
         float ddpi = 0.0f;
         SDL_GetDisplayDPI(monitor, &ddpi, NULL, NULL);
@@ -1060,7 +1083,11 @@ int GetMonitorRefreshRate(int monitor)
     int refresh = 0;
 
     const int monitorCount = SDL_GetNumVideoDisplays();
+#if defined(USING_VERSION_SDL3) // SDL3 Migration: Monitor is an id instead of index now, returns 0 on failure
+    if ((monitor > 0) && (monitor <= monitorCount))
+#else
     if ((monitor >= 0) && (monitor < monitorCount))
+#endif
     {
         SDL_DisplayMode mode;
         SDL_GetCurrentDisplayMode(monitor, &mode);
@@ -1076,7 +1103,14 @@ const char *GetMonitorName(int monitor)
 {
     const int monitorCount = SDL_GetNumVideoDisplays();
 
-    if ((monitor >= 0) && (monitor < monitorCount)) return SDL_GetDisplayName(monitor);
+#if defined(USING_VERSION_SDL3) // SDL3 Migration: Monitor is an id instead of index now, returns 0 on failure
+    if ((monitor > 0) && (monitor <= monitorCount))
+#else
+    if ((monitor >= 0) && (monitor < monitorCount))
+#endif
+    {
+        return SDL_GetDisplayName(monitor);
+    }
     else TRACELOG(LOG_WARNING, "SDL: Failed to find selected monitor");
 
     return "";
@@ -1209,13 +1243,13 @@ void EnableCursor(void)
     SDL_SetRelativeMouseMode(SDL_FALSE);
 
 #if defined(USING_VERSION_SDL3)
-    // SDL_ShowCursor() has been split into three functions: SDL_ShowCursor(), SDL_HideCursor(), and SDL_CursorVisible()
+    // NOTE: SDL_ShowCursor() has been split into three functions: 
+    // SDL_ShowCursor(), SDL_HideCursor(), and SDL_CursorVisible()
     SDL_ShowCursor();
 #else
     SDL_ShowCursor(SDL_ENABLE);
 #endif
 
-    platform.cursorRelative = false;
     CORE.Input.Mouse.cursorLocked = false;
 }
 
@@ -1224,7 +1258,6 @@ void DisableCursor(void)
 {
     SDL_SetRelativeMouseMode(SDL_TRUE);
 
-    platform.cursorRelative = true;
     CORE.Input.Mouse.cursorLocked = true;
 }
 
@@ -1332,7 +1365,7 @@ void PollInputEvents(void)
     CORE.Input.Mouse.currentWheelMove.y = 0;
 
     // Register previous mouse position
-    if (platform.cursorRelative) CORE.Input.Mouse.currentPosition = (Vector2){ 0.0f, 0.0f };
+    if (CORE.Input.Mouse.cursorLocked) CORE.Input.Mouse.currentPosition = (Vector2){ 0.0f, 0.0f };
     else CORE.Input.Mouse.previousPosition = CORE.Input.Mouse.currentPosition;
 
     // Reset last gamepad button/axis registered state
@@ -1634,7 +1667,7 @@ void PollInputEvents(void)
             } break;
             case SDL_MOUSEMOTION:
             {
-                if (platform.cursorRelative)
+                if (CORE.Input.Mouse.cursorLocked)
                 {
                     CORE.Input.Mouse.currentPosition.x = (float)event.motion.xrel;
                     CORE.Input.Mouse.currentPosition.y = (float)event.motion.yrel;

src/platforms/rcore_desktop_win32.c

@@ -1136,17 +1136,17 @@ Image GetClipboardImage(void)
 // Show mouse cursor
 void ShowCursor(void)
 {
-    CORE.Input.Mouse.cursorHidden = false;
     SetCursor(LoadCursorW(NULL, (LPCWSTR)IDC_ARROW));
+    CORE.Input.Mouse.cursorHidden = false;
 }
 
 // Hides mouse cursor
 void HideCursor(void)
 {
-    // NOTE: we use SetCursor instead of ShowCursor because it makes it easy
+    // NOTE: We use SetCursor() instead of ShowCursor() because 
-    // to only hide the cursor while it's inside the client area
+    // it makes it easy to only hide the cursor while it's inside the client area
-    CORE.Input.Mouse.cursorHidden = true;
     SetCursor(NULL);
+    CORE.Input.Mouse.cursorHidden = true;
 }
 
 // Enables cursor (unlock cursor)
@@ -1346,7 +1346,7 @@ void PollInputEvents(void)
 //----------------------------------------------------------------------------------
 
 // Initialize modern OpenGL context
-// NOTE: We need to create a dummy context first to query requried extensions
+// NOTE: We need to create a dummy context first to query required extensions
 HGLRC InitOpenGL(HWND hwnd, HDC hdc)
 {
     // First, create a dummy context to get WGL extensions
@@ -1621,8 +1621,7 @@ int InitPlatform(void)
 
     CORE.Window.ready = true;
 
-    // TODO: Should this function be called before or after drawing context is created? --> After swInit() called!
+    // Update flags (in case of deferred state change required)
-    //UpdateWindowSize(UPDATE_WINDOW_FIRST, platform.hwnd, platform.appScreenWidth, platform.appScreenHeight, platform.desiredFlags);
     UpdateFlags(platform.hwnd, platform.desiredFlags, platform.appScreenWidth, platform.appScreenHeight);
 
     CORE.Window.render.width = CORE.Window.screen.width;
@@ -1887,6 +1886,7 @@ static LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lpara
         } break;
         case WM_SETCURSOR:
         {
+            // Called when mouse moves, enters/leaves window...
             if (LOWORD(lparam) == HTCLIENT)
             {
                 SetCursor(CORE.Input.Mouse.cursorHidden? NULL : LoadCursorW(NULL, (LPCWSTR)IDC_ARROW));
@@ -1972,6 +1972,7 @@ static LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lpara
     return result;
 }
 
+// Handle keyboard input event
 static void HandleKey(WPARAM wparam, LPARAM lparam, char state)
 {
     KeyboardKey key = GetKeyFromWparam(wparam);
@@ -1991,12 +1992,15 @@ static void HandleKey(WPARAM wparam, LPARAM lparam, char state)
     // TODO: Add key to the queue as well?
 }
 
+// Handle mouse button input event
 static void HandleMouseButton(int button, char state)
 {
+    // Register current mouse button state
     CORE.Input.Mouse.currentButtonState[button] = state;
     CORE.Input.Touch.currentTouchState[button] = state;
 }
 
+// Handle raw input event
 static void HandleRawInput(LPARAM lparam)
 {
     RAWINPUT input = { 0 };
@@ -2020,6 +2024,7 @@ static void HandleRawInput(LPARAM lparam)
     //if (CORE.Input.Mouse.currentPosition.y != 0) abort();
 }
 
+// Handle window resizing event
 static void HandleWindowResize(HWND hwnd, int *width, int *height)
 {
     if (CORE.Window.flags & FLAG_WINDOW_MINIMIZED) return;
@@ -2051,10 +2056,8 @@ static void HandleWindowResize(HWND hwnd, int *width, int *height)
         *height = screenHeight;
     }
 
-    CORE.Window.screenScale = MatrixScale(
+    CORE.Window.screenScale = MatrixScale( (float)CORE.Window.render.width/CORE.Window.screen.width,
-        (float)CORE.Window.render.width/CORE.Window.screen.width,
+        (float)CORE.Window.render.height/CORE.Window.screen.height, 1.0f);
-        (float)CORE.Window.render.height/CORE.Window.screen.height,
-        1.0f);
 }
 
 // Update window style