win32u: Support DisplayConfigGetDeviceInfo(DISPLAYCONFIG_DEVICE_INFO_…

…GET_ADVANCED_COLOR_INFO) based on Gamescope setting.

CW-Bug-Id: #22912

dlls/win32u/sysparams.c

@@ -6101,11 +6101,36 @@ NTSTATUS WINAPI NtUserDisplayConfigGetDeviceInfo( DISPLAYCONFIG_DEVICE_INFO_HEAD
 
         return STATUS_NOT_SUPPORTED;
     }
+    case DISPLAYCONFIG_DEVICE_INFO_GET_ADVANCED_COLOR_INFO:
+    {
+        DISPLAYCONFIG_GET_ADVANCED_COLOR_INFO *info = (DISPLAYCONFIG_GET_ADVANCED_COLOR_INFO *)packet;
+        const char *env;
+
+        FIXME( "DISPLAYCONFIG_DEVICE_INFO_GET_ADVANCED_COLOR_INFO semi-stub.\n" );
+
+        if (packet->size < sizeof(*info))
+            return STATUS_INVALID_PARAMETER;
+
+        info->advancedColorSupported = 0;
+        info->advancedColorEnabled = 0;
+        info->wideColorEnforced = 0;
+        info->advancedColorForceDisabled = 0;
+        info->colorEncoding = DISPLAYCONFIG_COLOR_ENCODING_RGB;
+        info->bitsPerColorChannel = 8;
+        if ((env = getenv("DXVK_HDR")) && *env == '1')
+        {
+            TRACE( "HDR is enabled.\n" );
+            info->advancedColorSupported = 1;
+            info->advancedColorEnabled = 1;
+            info->bitsPerColorChannel = 10;
+        }
+
+        return STATUS_SUCCESS;
+    }
     case DISPLAYCONFIG_DEVICE_INFO_SET_TARGET_PERSISTENCE:
     case DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_BASE_TYPE:
     case DISPLAYCONFIG_DEVICE_INFO_GET_SUPPORT_VIRTUAL_RESOLUTION:
     case DISPLAYCONFIG_DEVICE_INFO_SET_SUPPORT_VIRTUAL_RESOLUTION:
-    case DISPLAYCONFIG_DEVICE_INFO_GET_ADVANCED_COLOR_INFO:
     case DISPLAYCONFIG_DEVICE_INFO_SET_ADVANCED_COLOR_STATE:
     case DISPLAYCONFIG_DEVICE_INFO_GET_SDR_WHITE_LEVEL:
     default: