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rjd324
What is the canonical way of disabling screen blanker through C?
Posted on: 2022/8/21 17:48    #1
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What is the canonical way of disabling screen blanker through C for a particular application?
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walkero
Re: What is the canonical way of disabling screen blanker through C?
Posted on: 2022/8/21 17:54    #2
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Have a look at this page
https://wiki.amigaos.net/wiki/Application_Library
at some point, it writes that
Quote:
It can control the behaviour of screen-blankers. Applications that don’t want to be disturbed may prevent the blanker from kicking in, or tell other applications to “keep quiet”.
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Raziel
Re: What is the canonical way of disabling screen blanker through C?
Posted on: 2022/8/21 20:35    #3
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@walkero

But what if I don't want (or can't) add another dependency and simply want to tell the screenblanker to shut up if the program is running?

Isn't there a c/c++ example that just tells screenblanker to not disturb?

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kas1e
Re: What is the canonical way of disabling screen blanker through C?
Posted on: 2022/8/21 20:57    #4
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@rjd324, Raziel
Yeah, this is easy, you just open application.library (part of OS, so no dependencies), register your app on start, then send notification to screenblanker engine to shut up when need it, and at exit from your app de-register/close application.library.

That easy and few strings:

Open/register:

// application.library (to register app, to enable/disable blankers, etc).
    if (!(ApplicationBase = OpenLibrary("application.library", 52))) {
        fprintf(stderr,"Failed to open application.library\n");
        return FALSE;
    }     
    IApplication  = (struct ApplicationIFace *)GetInterface(ApplicationBase, "application", 2, NULL);

    // register an app for aplication library
    appID = RegisterApplication("Odyssey",
                REGAPP_URLIdentifier, "none",
                REGAPP_Description, "Odyssey Web Browser",
                TAG_END);



DeRegister/Close:

if (ApplicationBase) {
        UnregisterApplication(appID, NULL);
        DropInterface((struct Interface*)IApplication);
        CloseLibrary(ApplicationBase);
        ApplicationBase = NULL;
    }



So when basics done, you can then send from your app all the notifications to screenblanker engine : and to disabled screenblankers, and to enable them back.

For Odyssey i made this function which pass arguments as "struct screen" and bool TRUE/FALSE for enable/disable screenblanker engine:

void enable_blanker(struct Screen *screen, ULONG enable)
{
            if(enable)
            {
                    // enable screenblanker
                    SetApplicationAttrs(appID,
                                APPATTR_AllowsBlanker, TRUE,
                                APPATTR_NeedsGameMode, FALSE,
                    TAG_END);
            }
            else
            {
                    // disable screenblanker
                    SetApplicationAttrs(appID,
                                APPATTR_AllowsBlanker, FALSE,
                                APPATTR_NeedsGameMode, TRUE,
                    TAG_END); 
            }
}


Then in any place of the Odyssey i can just then:

somethings blblalbalbal

enable_blanker(_screen(obj), FALSE);

something blablablab;

enable_blanker(_screen(obj), TRUE);



And that all
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samo79
Re: What is the canonical way of disabling screen blanker through C?
Posted on: 2022/8/21 21:06    #5
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@kas1e

Could you try to implement it in ScummVM?
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kas1e
Re: What is the canonical way of disabling screen blanker through C?
Posted on: 2022/8/21 21:32    #6
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@samo
Matter of copy+paste of this code if Raziel need it. Dunno why it may needs for Scummvm through ?
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samo79
Re: What is the canonical way of disabling screen blanker through C?
Posted on: 2022/8/21 21:41    #7
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@kas1e

Because its annoying in some games

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Raziel
Re: What is the canonical way of disabling screen blanker through C?
Posted on: 2022/8/22 7:58    #8
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@samo79

I'll try to add it (when time permits)...may need some help
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