video: Expose HDR metadata via window properties

include/SDL3/SDL_events.h

@@ -94,14 +94,13 @@ typedef enum SDL_EventType
 
     /* Display events */
     /* 0x150 was SDL_DISPLAYEVENT, reserve the number for sdl2-compat */
-    SDL_EVENT_DISPLAY_ORIENTATION = 0x151, /**< Display orientation has changed to data1 */
-    SDL_EVENT_DISPLAY_ADDED,               /**< Display has been added to the system */
-    SDL_EVENT_DISPLAY_REMOVED,             /**< Display has been removed from the system */
-    SDL_EVENT_DISPLAY_MOVED,               /**< Display has changed position */
+    SDL_EVENT_DISPLAY_ORIENTATION = 0x151,   /**< Display orientation has changed to data1 */
+    SDL_EVENT_DISPLAY_ADDED,                 /**< Display has been added to the system */
+    SDL_EVENT_DISPLAY_REMOVED,               /**< Display has been removed from the system */
+    SDL_EVENT_DISPLAY_MOVED,                 /**< Display has changed position */
     SDL_EVENT_DISPLAY_CONTENT_SCALE_CHANGED, /**< Display has changed content scale */
-    SDL_EVENT_DISPLAY_HDR_STATE_CHANGED,   /**< Display HDR properties have changed */
     SDL_EVENT_DISPLAY_FIRST = SDL_EVENT_DISPLAY_ORIENTATION,
-    SDL_EVENT_DISPLAY_LAST = SDL_EVENT_DISPLAY_HDR_STATE_CHANGED,
+    SDL_EVENT_DISPLAY_LAST = SDL_EVENT_DISPLAY_CONTENT_SCALE_CHANGED,
 
     /* Window events */
     /* 0x200 was SDL_WINDOWEVENT, reserve the number for sdl2-compat */
@@ -134,6 +133,7 @@ typedef enum SDL_EventType
                                              associated with it are invalid */
     SDL_EVENT_WINDOW_PEN_ENTER,         /**< Window has gained focus of the pressure-sensitive pen with ID "data1" */
     SDL_EVENT_WINDOW_PEN_LEAVE,         /**< Window has lost focus of the pressure-sensitive pen with ID "data1" */
+    SDL_EVENT_WINDOW_HDR_STATE_CHANGED, /**< Window HDR properties have changed */
     SDL_EVENT_WINDOW_FIRST = SDL_EVENT_WINDOW_SHOWN,
     SDL_EVENT_WINDOW_LAST = SDL_EVENT_WINDOW_PEN_LEAVE,
 

include/SDL3/SDL_video.h

@@ -411,17 +411,9 @@ extern SDL_DECLSPEC SDL_DisplayID SDLCALL SDL_GetPrimaryDisplay(void);
  * The following read-only properties are provided by SDL:
  *
  * - `SDL_PROP_DISPLAY_HDR_ENABLED_BOOLEAN`: true if the display has HDR
- *   headroom above the SDR white point. This property can change dynamically
- *   when SDL_EVENT_DISPLAY_HDR_STATE_CHANGED is sent.
- * - `SDL_PROP_DISPLAY_SDR_WHITE_POINT_FLOAT`: the value of SDR white in the
- *   SDL_COLORSPACE_SRGB_LINEAR colorspace. On Windows this corresponds to the
- *   SDR white level in scRGB colorspace, and on Apple platforms this is
- *   always 1.0 for EDR content. This property can change dynamically when
- *   SDL_EVENT_DISPLAY_HDR_STATE_CHANGED is sent.
- * - `SDL_PROP_DISPLAY_HDR_HEADROOM_FLOAT`: the additional high dynamic range
- *   that can be displayed, in terms of the SDR white point. When HDR is not
- *   enabled, this will be 1.0. This property can change dynamically when
- *   SDL_EVENT_DISPLAY_HDR_STATE_CHANGED is sent.
+ *   headroom above the SDR white point. This is for informational and diagnostic
+ *   purposes only, as not all platforms provide this information at the display
+ *   level.
  *
  * On KMS/DRM:
  *
@@ -443,8 +435,6 @@ extern SDL_DECLSPEC SDL_DisplayID SDLCALL SDL_GetPrimaryDisplay(void);
 extern SDL_DECLSPEC SDL_PropertiesID SDLCALL SDL_GetDisplayProperties(SDL_DisplayID displayID);
 
 #define SDL_PROP_DISPLAY_HDR_ENABLED_BOOLEAN             "SDL.display.HDR_enabled"
-#define SDL_PROP_DISPLAY_SDR_WHITE_POINT_FLOAT           "SDL.display.SDR_white_point"
-#define SDL_PROP_DISPLAY_HDR_HEADROOM_FLOAT              "SDL.display.HDR_headroom"
 #define SDL_PROP_DISPLAY_KMSDRM_PANEL_ORIENTATION_NUMBER "SDL.display.KMSDRM.panel_orientation"
 
 /**
@@ -1113,6 +1103,18 @@ extern SDL_DECLSPEC SDL_Window *SDLCALL SDL_GetWindowParent(SDL_Window *window);
  *
  * - `SDL_PROP_WINDOW_SHAPE_POINTER`: the surface associated with a shaped
  *   window
+ *  - `SDL_PROP_WINDOW_HDR_ENABLED_BOOLEAN`: true if the window has HDR
+ *   headroom above the SDR white point. This property can change dynamically
+ *   when SDL_EVENT_WINDOW_HDR_STATE_CHANGED is sent.
+ * - `SDL_PROP_WINDOW_SDR_WHITE_LEVEL_FLOAT`: the value of SDR white in the
+ *   SDL_COLORSPACE_SRGB_LINEAR colorspace. On Windows this corresponds to the
+ *   SDR white level in scRGB colorspace, and on Apple platforms this is
+ *   always 1.0 for EDR content. This property can change dynamically when
+ *   SDL_EVENT_WINDOW_HDR_STATE_CHANGED is sent.
+ * - `SDL_PROP_WINDOW_HDR_HEADROOM_FLOAT`: the additional high dynamic range
+ *   that can be displayed, in terms of the SDR white point. When HDR is not
+ *   enabled, this will be 1.0. This property can change dynamically when
+ *   SDL_EVENT_WINDOW_HDR_STATE_CHANGED is sent.
  *
  * On Android:
  *
@@ -1216,6 +1218,9 @@ extern SDL_DECLSPEC SDL_Window *SDLCALL SDL_GetWindowParent(SDL_Window *window);
 extern SDL_DECLSPEC SDL_PropertiesID SDLCALL SDL_GetWindowProperties(SDL_Window *window);
 
 #define SDL_PROP_WINDOW_SHAPE_POINTER                               "SDL.window.shape"
+#define SDL_PROP_WINDOW_HDR_ENABLED_BOOLEAN                         "SDL.window.HDR_enabled"
+#define SDL_PROP_WINDOW_SDR_WHITE_LEVEL_FLOAT                       "SDL.window.SDR_white_level"
+#define SDL_PROP_WINDOW_HDR_HEADROOM_FLOAT                          "SDL.window.HDR_headroom"
 #define SDL_PROP_WINDOW_ANDROID_WINDOW_POINTER                      "SDL.window.android.window"
 #define SDL_PROP_WINDOW_ANDROID_SURFACE_POINTER                     "SDL.window.android.surface"
 #define SDL_PROP_WINDOW_UIKIT_WINDOW_POINTER                        "SDL.window.uikit.window"

src/events/SDL_events.c

@@ -285,7 +285,6 @@ static void SDL_LogEvent(const SDL_Event *event)
         SDL_DISPLAYEVENT_CASE(SDL_EVENT_DISPLAY_REMOVED);
         SDL_DISPLAYEVENT_CASE(SDL_EVENT_DISPLAY_MOVED);
         SDL_DISPLAYEVENT_CASE(SDL_EVENT_DISPLAY_CONTENT_SCALE_CHANGED);
-        SDL_DISPLAYEVENT_CASE(SDL_EVENT_DISPLAY_HDR_STATE_CHANGED);
 #undef SDL_DISPLAYEVENT_CASE
 
 #define SDL_WINDOWEVENT_CASE(x)                \
@@ -319,6 +318,7 @@ static void SDL_LogEvent(const SDL_Event *event)
         SDL_WINDOWEVENT_CASE(SDL_EVENT_WINDOW_ENTER_FULLSCREEN);
         SDL_WINDOWEVENT_CASE(SDL_EVENT_WINDOW_LEAVE_FULLSCREEN);
         SDL_WINDOWEVENT_CASE(SDL_EVENT_WINDOW_DESTROYED);
+        SDL_WINDOWEVENT_CASE(SDL_EVENT_WINDOW_HDR_STATE_CHANGED);
 #undef SDL_WINDOWEVENT_CASE
 
 #define PRINT_KEYDEV_EVENT(event) (void)SDL_snprintf(details, sizeof(details), " (timestamp=%u which=%u)", (uint)event->kdevice.timestamp, (uint)event->kdevice.which)

src/render/SDL_render.c

@@ -737,16 +737,11 @@ static void UpdateMainViewDimensions(SDL_Renderer *renderer)
 
 static void UpdateHDRProperties(SDL_Renderer *renderer)
 {
-    SDL_DisplayID displayID = SDL_GetDisplayForWindow(renderer->window);
-    SDL_PropertiesID display_props;
+    SDL_PropertiesID window_props;
     SDL_PropertiesID renderer_props;
 
-    if (!displayID) {
-        return;
-    }
-
-    display_props = SDL_GetDisplayProperties(displayID);
-    if (!display_props) {
+    window_props = SDL_GetWindowProperties(renderer->window);
+    if (!window_props) {
         return;
     }
 
@@ -758,8 +753,8 @@ static void UpdateHDRProperties(SDL_Renderer *renderer)
     renderer->color_scale /= renderer->SDR_white_point;
 
     if (renderer->output_colorspace == SDL_COLORSPACE_SRGB_LINEAR) {
-        renderer->SDR_white_point = SDL_GetFloatProperty(display_props, SDL_PROP_DISPLAY_SDR_WHITE_POINT_FLOAT, 1.0f);
-        renderer->HDR_headroom = SDL_GetFloatProperty(display_props, SDL_PROP_DISPLAY_HDR_HEADROOM_FLOAT, 1.0f);
+        renderer->SDR_white_point = SDL_GetFloatProperty(window_props, SDL_PROP_WINDOW_SDR_WHITE_LEVEL_FLOAT, 1.0f);
+        renderer->HDR_headroom = SDL_GetFloatProperty(window_props, SDL_PROP_WINDOW_HDR_HEADROOM_FLOAT, 1.0f);
     } else {
         renderer->SDR_white_point = 1.0f;
         renderer->HDR_headroom = 1.0f;
@@ -836,7 +831,7 @@ static int SDLCALL SDL_RendererEventWatch(void *userdata, SDL_Event *event)
                 UpdateHDRProperties(renderer);
             }
         }
-    } else if (event->type == SDL_EVENT_DISPLAY_HDR_STATE_CHANGED) {
+    } else if (event->type == SDL_EVENT_WINDOW_HDR_STATE_CHANGED) {
         UpdateHDRProperties(renderer);
     }
 

src/test/SDL_test_common.c

@@ -1576,12 +1576,6 @@ static void SDLTest_PrintEvent(const SDL_Event *event)
                     event->display.displayID, (int)(scale * 100.0f));
         }
         break;
-    case SDL_EVENT_DISPLAY_HDR_STATE_CHANGED:
-        {
-            SDL_Log("SDL EVENT: Display %" SDL_PRIu32 " HDR %s",
-                    event->display.displayID, event->display.data1 ? "enabled" : "disabled");
-        }
-        break;
     case SDL_EVENT_DISPLAY_MOVED:
         SDL_Log("SDL EVENT: Display %" SDL_PRIu32 " changed position",
                 event->display.displayID);
@@ -1668,6 +1662,9 @@ static void SDLTest_PrintEvent(const SDL_Event *event)
     case SDL_EVENT_WINDOW_DESTROYED:
         SDL_Log("SDL EVENT: Window %" SDL_PRIu32 " destroyed", event->window.windowID);
         break;
+    case SDL_EVENT_WINDOW_HDR_STATE_CHANGED:
+        SDL_Log("SDL EVENT: Window %" SDL_PRIu32 " HDR %s", event->window.windowID, event->window.data1 ? "enabled" : "disabled");
+        break;
     case SDL_EVENT_KEYBOARD_ADDED:
         SDL_Log("SDL EVENT: Keyboard %" SDL_PRIu32 " attached",
                 event->kdevice.which);

src/video/SDL_sysvideo.h

@@ -34,6 +34,12 @@ typedef struct SDL_DisplayData SDL_DisplayData;
 typedef struct SDL_DisplayModeData SDL_DisplayModeData;
 typedef struct SDL_WindowData SDL_WindowData;
 
+typedef struct
+{
+    float SDR_white_level;
+    float HDR_headroom;
+} SDL_HDROutputProperties;
+
 /* Define the SDL window structure, corresponding to toplevel windows */
 struct SDL_Window
 {
@@ -82,6 +88,7 @@ struct SDL_Window
 
     SDL_DisplayMode requested_fullscreen_mode;
     SDL_DisplayMode current_fullscreen_mode;
+    SDL_HDROutputProperties HDR;
 
     float opacity;
 
@@ -119,12 +126,6 @@ struct SDL_Window
 #define SDL_WINDOW_IS_POPUP(W) \
     (((W)->flags & (SDL_WINDOW_TOOLTIP | SDL_WINDOW_POPUP_MENU)) != 0)
 
-typedef struct
-{
-    float SDR_white_point;
-    float HDR_headroom;
-} SDL_HDRDisplayProperties;
-
 /*
  * Define the SDL display structure.
  * This corresponds to physical monitors attached to the system.
@@ -141,7 +142,7 @@ struct SDL_VideoDisplay
     SDL_DisplayOrientation natural_orientation;
     SDL_DisplayOrientation current_orientation;
     float content_scale;
-    SDL_HDRDisplayProperties HDR;
+    SDL_HDROutputProperties HDR;
 
     SDL_Window *fullscreen_window;
 
@@ -160,7 +161,8 @@ typedef enum
     VIDEO_DEVICE_CAPS_SENDS_FULLSCREEN_DIMENSIONS = 0x04,
     VIDEO_DEVICE_CAPS_FULLSCREEN_ONLY = 0x08,
     VIDEO_DEVICE_CAPS_SENDS_DISPLAY_CHANGES = 0x10,
-    VIDEO_DEVICE_CAPS_DISABLE_MOUSE_WARP_ON_FULLSCREEN_TRANSITIONS = 0x20
+    VIDEO_DEVICE_CAPS_DISABLE_MOUSE_WARP_ON_FULLSCREEN_TRANSITIONS = 0x20,
+    VIDEO_DEVICE_CAPS_SENDS_HDR_CHANGES = 0x40
 } DeviceCaps;
 
 /* Fullscreen operations */
@@ -511,7 +513,7 @@ extern void SDL_ResetFullscreenDisplayModes(SDL_VideoDisplay *display);
 extern void SDL_SetDesktopDisplayMode(SDL_VideoDisplay *display, const SDL_DisplayMode *mode);
 extern void SDL_SetCurrentDisplayMode(SDL_VideoDisplay *display, const SDL_DisplayMode *mode);
 extern void SDL_SetDisplayContentScale(SDL_VideoDisplay *display, float scale);
-extern void SDL_SetDisplayHDRProperties(SDL_VideoDisplay *display, const SDL_HDRDisplayProperties *HDR);
+extern void SDL_SetDisplayHDRProperties(SDL_VideoDisplay *display, const SDL_HDROutputProperties *HDR);
 extern int SDL_SetDisplayModeForDisplay(SDL_VideoDisplay *display, SDL_DisplayMode *mode);
 extern SDL_VideoDisplay *SDL_GetVideoDisplay(SDL_DisplayID display);
 extern SDL_DisplayID SDL_GetDisplayForWindowPosition(SDL_Window *window);
@@ -521,6 +523,7 @@ extern int SDL_GetDisplayIndex(SDL_DisplayID displayID);
 extern SDL_DisplayData *SDL_GetDisplayDriverData(SDL_DisplayID display);
 extern SDL_DisplayData *SDL_GetDisplayDriverDataForWindow(SDL_Window *window);
 extern int SDL_GetMessageBoxCount(void);
+extern void SDL_SetWindowHDRProperties(SDL_Window *window, const SDL_HDROutputProperties *HDR, SDL_bool send_event);
 
 extern void SDL_GL_DeduceMaxSupportedESProfile(int *major, int *minor);
 

src/video/SDL_video.c

@@ -195,6 +195,11 @@ static SDL_bool SDL_DisableMouseWarpOnFullscreenTransitions(SDL_VideoDevice *_th
     return !!(_this->device_caps & VIDEO_DEVICE_CAPS_DISABLE_MOUSE_WARP_ON_FULLSCREEN_TRANSITIONS);
 }
 
+static SDL_bool SDL_DriverSendsHDRChanges(SDL_VideoDevice *_this)
+{
+    return !!(_this->device_caps & VIDEO_DEVICE_CAPS_SENDS_HDR_CHANGES);
+}
+
 /* Hint to treat all window ops as synchronous */
 static SDL_bool syncHint;
 
@@ -763,23 +768,11 @@ SDL_DisplayID SDL_AddVideoDisplay(const SDL_VideoDisplay *display, SDL_bool send
         new_display->fullscreen_modes[i].displayID = id;
     }
 
-    props = SDL_GetDisplayProperties(id);
+    new_display->HDR.HDR_headroom = SDL_max(display->HDR.HDR_headroom, 1.0f);
+    new_display->HDR.SDR_white_level = SDL_max(display->HDR.SDR_white_level, 1.0f);
 
-    if (display->HDR.HDR_headroom > 1.0f) {
-        SDL_SetBooleanProperty(props, SDL_PROP_DISPLAY_HDR_ENABLED_BOOLEAN, SDL_TRUE);
-    } else {
-        SDL_SetBooleanProperty(props, SDL_PROP_DISPLAY_HDR_ENABLED_BOOLEAN, SDL_FALSE);
-    }
-    if (display->HDR.SDR_white_point <= 1.0f) {
-        SDL_SetFloatProperty(props, SDL_PROP_DISPLAY_SDR_WHITE_POINT_FLOAT, 1.0f);
-    } else {
-        SDL_SetFloatProperty(props, SDL_PROP_DISPLAY_SDR_WHITE_POINT_FLOAT, display->HDR.SDR_white_point);
-    }
-    if (display->HDR.HDR_headroom <= 1.0f) {
-        SDL_SetFloatProperty(props, SDL_PROP_DISPLAY_HDR_HEADROOM_FLOAT, 1.0f);
-    } else {
-        SDL_SetFloatProperty(props, SDL_PROP_DISPLAY_HDR_HEADROOM_FLOAT, display->HDR.HDR_headroom);
-    }
+    props = SDL_GetDisplayProperties(id);
+    SDL_SetBooleanProperty(props, SDL_PROP_DISPLAY_HDR_ENABLED_BOOLEAN, new_display->HDR.HDR_headroom > 1.0f);
 
     SDL_UpdateDesktopBounds();
 
@@ -1053,37 +1046,42 @@ float SDL_GetDisplayContentScale(SDL_DisplayID displayID)
     return display->content_scale;
 }
 
-void SDL_SetDisplayHDRProperties(SDL_VideoDisplay *display, const SDL_HDRDisplayProperties *HDR)
+void SDL_SetWindowHDRProperties(SDL_Window *window, const SDL_HDROutputProperties *HDR, SDL_bool send_event)
 {
-    SDL_PropertiesID props = SDL_GetDisplayProperties(display->id);
-    SDL_bool changed = SDL_FALSE;
+    if (window->HDR.HDR_headroom != HDR->HDR_headroom || window->HDR.SDR_white_level != window->HDR.SDR_white_level) {
+        SDL_PropertiesID window_props = SDL_GetWindowProperties(window);
 
-    if (HDR->SDR_white_point != display->HDR.SDR_white_point) {
-        if (HDR->SDR_white_point <= 1.0f) {
-            SDL_SetFloatProperty(props, SDL_PROP_DISPLAY_SDR_WHITE_POINT_FLOAT, 1.0f);
-        } else {
-            SDL_SetFloatProperty(props, SDL_PROP_DISPLAY_SDR_WHITE_POINT_FLOAT, HDR->SDR_white_point);
+        SDL_SetFloatProperty(window_props, SDL_PROP_WINDOW_HDR_HEADROOM_FLOAT, SDL_max(HDR->HDR_headroom, 1.0f));
+        SDL_SetFloatProperty(window_props, SDL_PROP_WINDOW_SDR_WHITE_LEVEL_FLOAT, SDL_max(HDR->SDR_white_level, 1.0f));
+        SDL_SetBooleanProperty(window_props, SDL_PROP_WINDOW_HDR_ENABLED_BOOLEAN, HDR->HDR_headroom > 1.0f);
+        SDL_copyp(&window->HDR, HDR);
+
+        if (send_event) {
+            SDL_SendWindowEvent(window, SDL_EVENT_WINDOW_HDR_STATE_CHANGED, HDR->HDR_headroom > 1.0f, 0);
         }
+    }
+}
+
+void SDL_SetDisplayHDRProperties(SDL_VideoDisplay *display, const SDL_HDROutputProperties *HDR)
+{
+    SDL_bool changed = SDL_FALSE;
+
+    if (HDR->SDR_white_level != display->HDR.SDR_white_level) {
+        display->HDR.SDR_white_level = SDL_max(HDR->SDR_white_level, 1.0f);
         changed = SDL_TRUE;
     }
     if (HDR->HDR_headroom != display->HDR.HDR_headroom) {
-        if (HDR->HDR_headroom > 1.0f) {
-            SDL_SetBooleanProperty(props, SDL_PROP_DISPLAY_HDR_ENABLED_BOOLEAN, SDL_TRUE);
-        } else {
-            SDL_SetBooleanProperty(props, SDL_PROP_DISPLAY_HDR_ENABLED_BOOLEAN, SDL_FALSE);
-        }
-        if (HDR->HDR_headroom <= 1.0f) {
-            SDL_SetFloatProperty(props, SDL_PROP_DISPLAY_HDR_HEADROOM_FLOAT, 1.0f);
-        } else {
-            SDL_SetFloatProperty(props, SDL_PROP_DISPLAY_HDR_HEADROOM_FLOAT, HDR->HDR_headroom);
-        }
+        display->HDR.HDR_headroom = SDL_max(HDR->HDR_headroom, 1.0f);
         changed = SDL_TRUE;
     }
     SDL_copyp(&display->HDR, HDR);
 
-    if (changed) {
-        SDL_bool enabled = SDL_GetBooleanProperty(props, SDL_PROP_DISPLAY_HDR_ENABLED_BOOLEAN, SDL_FALSE);
-        SDL_SendDisplayEvent(display, SDL_EVENT_DISPLAY_HDR_STATE_CHANGED, enabled);
+    if (changed && !SDL_DriverSendsHDRChanges(_this)) {
+        for (SDL_Window *w = display->device->windows; w; w = w->next) {
+            if (SDL_GetDisplayForWindow(w) == display->id) {
+                SDL_SetWindowHDRProperties(w, &display->HDR, SDL_TRUE);
+            }
+        }
     }
 }
 
@@ -2247,8 +2245,10 @@ SDL_Window *SDL_CreateWindowWithProperties(SDL_PropertiesID props)
     window->undefined_x = undefined_x;
     window->undefined_y = undefined_y;
 
+    SDL_VideoDisplay *display = SDL_GetVideoDisplayForWindow(window);
+    SDL_SetWindowHDRProperties(window, &display->HDR, SDL_FALSE);
+
     if (flags & SDL_WINDOW_FULLSCREEN || IsFullscreenOnly(_this)) {
-        SDL_VideoDisplay *display = SDL_GetVideoDisplayForWindow(window);
         SDL_Rect bounds;
 
         SDL_GetDisplayBounds(display->id, &bounds);

src/video/cocoa/SDL_cocoamodes.m

@@ -290,9 +290,9 @@ static SDL_bool GetDisplayMode(SDL_VideoDevice *_this, CGDisplayModeRef vidmode,
     return displayName;
 }
 
-static void Cocoa_GetHDRProperties(CGDirectDisplayID displayID, SDL_HDRDisplayProperties *HDR)
+static void Cocoa_GetHDRProperties(CGDirectDisplayID displayID, SDL_HDROutputProperties *HDR)
 {
-    HDR->SDR_white_point = 1.0f;
+    HDR->SDR_white_level = 1.0f;
     HDR->HDR_headroom = 1.0f;
 
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= 101500 /* Added in the 10.15 SDK */
@@ -397,7 +397,7 @@ void Cocoa_InitModes(SDL_VideoDevice *_this)
 
 void Cocoa_UpdateDisplays(SDL_VideoDevice *_this)
 {
-    SDL_HDRDisplayProperties HDR;
+    SDL_HDROutputProperties HDR;
     int i;
 
     for (i = 0; i < _this->num_displays; ++i) {

src/video/uikit/SDL_uikitmodes.m

@@ -242,7 +242,7 @@ int UIKit_AddDisplay(UIScreen *uiscreen, SDL_bool send_event)
     }
     display.desktop_mode = mode;
 
-    display.HDR.SDR_white_point = 1.0f;
+    display.HDR.SDR_white_level = 1.0f;
     display.HDR.HDR_headroom = 1.0f;
 
 #ifndef SDL_PLATFORM_TVOS