GUI page switching and alpha blending

The following warnings occurred:

Warning [2] Undefined array key "lockoutexpiry" - Line: 94 - File: global.php PHP 8.1.27 (Linux)

File	Line	Function
/global.php	94	errorHandler->error
/printthread.php	16	require_once

Warning [2] Undefined array key "lockoutexpiry" - Line: 573 - File: global.php PHP 8.1.27 (Linux)

File	Line	Function
/global.php	573	errorHandler->error
/printthread.php	16	require_once

Warning [2] Undefined variable $can_access_moderationqueue - Line: 752 - File: global.php PHP 8.1.27 (Linux)

File	Line	Function
/global.php	752	errorHandler->error
/printthread.php	16	require_once

Warning [2] Undefined array key "avatartype" - Line: 892 - File: global.php PHP 8.1.27 (Linux)

File	Line	Function
/global.php	892	errorHandler->error
/printthread.php	16	require_once

Warning [2] Undefined array key "avatartype" - Line: 892 - File: global.php PHP 8.1.27 (Linux)

File	Line	Function
/global.php	892	errorHandler->error
/printthread.php	16	require_once

Warning [2] Undefined variable $awaitingusers - Line: 34 - File: global.php(959) : eval()'d code PHP 8.1.27 (Linux)

File	Line	Function
/global.php(959) : eval()'d code	34	errorHandler->error
/global.php	959	eval
/printthread.php	16	require_once

Warning [2] Undefined array key "style" - Line: 1024 - File: global.php PHP 8.1.27 (Linux)

File	Line	Function
/global.php	1024	errorHandler->error
/printthread.php	16	require_once

Warning [2] Undefined property: MyLanguage::$lang_select_default - Line: 5308 - File: inc/functions.php PHP 8.1.27 (Linux)

File	Line	Function
/inc/functions.php	5308	errorHandler->error
/global.php	1024	build_theme_select
/printthread.php	16	require_once

Warning [2] Undefined array key 1 - Line: 1474 - File: inc/functions.php PHP 8.1.27 (Linux)

File	Line	Function
/inc/functions.php	1474	errorHandler->error
/inc/functions.php	1429	fetch_forum_permissions
/printthread.php	76	forum_permissions

Warning [2] Undefined array key "showimages" - Line: 160 - File: printthread.php PHP 8.1.27 (Linux)

File	Line	Function
/printthread.php	160	errorHandler->error

Warning [2] Undefined array key "showvideos" - Line: 165 - File: printthread.php PHP 8.1.27 (Linux)

File	Line	Function
/printthread.php	165	errorHandler->error

GUI page switching and alpha blending - Printable Version

+- Forums (https://www.vdrift.net/Forum)
+-- Forum: Project (https://www.vdrift.net/Forum/forumdisplay.php?fid=4)
+--- Forum: Development (https://www.vdrift.net/Forum/forumdisplay.php?fid=9)
+--- Thread: GUI page switching and alpha blending (/showthread.php?tid=1834)

GUI page switching and alpha blending - NaN - 09-18-2014

I've been working on some GUI issues and ran into an elementary problem with gui page fade in/out.

The fading is imlemented by reducing the opacity of the old page while increasing the opacity of the new one. The problem is that alpha blending the pages on top of each other with the background is not equivalent to fading from one page to another (the math is different).

The result can be observed in current master, since I've fixed an opacity related issue with a texture used by the gui, a slight flickering of the lower gui area can be seen (it is less noticeable in darker areas).

Not sure if this is fixable, might be worked around by reducing opacity, or maybe going fully opaque, increasing fading time, or disabling fading completely, adjusting gui colors to make it less visible...