Getting DisplayID/ModeID info

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rwo

Posted on: 2025/5/20 11:53 #1

Not too shy to talk

I need to figure out a DisplayID/ModeID width/height,
without opening Picasso or Cybergraphics, only with gfx lib (if possible)

// This is not what I'm looking for
page_w = scr->Width;
page_h = scr->Height;

// with CGFX I can do this
dsp_w = GetCyberIDAttr( CYBRIDATTR_WIDTH, modeid );
dsp_h = GetCyberIDAttr( CYBRIDATTR_HEIGHT, modeid );

// with P96I can do this
dsp_w = p96GetModeIDAttr( modeid, P96IDA_WIDTH );
dsp_h = p96GetModeIDAttr( modeid, P96IDA_HEIGHT );

// Get ModeID size, via gfx v54 if possible
dsp_w = ?
dsp_h = ?

“The best thing about a boolean is even if you are wrong, you are only off by a bit.”

kas1e

Re: Getting DisplayID/ModeID info

Posted on: 2025/5/20 12:08 #2

Home away from home

@rwo
This is GetVPModeID to get the modeid, and GetDisplayInfoData to get height and width, small test case:


#include <exec/types.h>

#include <proto/exec.h>

#include <proto/dos.h>

#include <proto/intuition.h>

#include <proto/graphics.h>

#include <intuition/screens.h>

#include <graphics/displayinfo.h>



int main(void)

{

    struct Library *GraphicsBase     = NULL;

    struct GraphicsIFace *IGraphics  = NULL;

    struct Library *IntuitionBase    = NULL;

    struct IntuitionIFace *IIntuition = NULL;



    // Open libraries and interfaces

    if (!(GraphicsBase = IExec->OpenLibrary("graphics.library", 54)) ||

        !(IGraphics = (struct GraphicsIFace *)IExec->GetInterface(GraphicsBase, "main", 1, NULL)) ||

        !(IntuitionBase = IExec->OpenLibrary("intuition.library", 51)) ||

        !(IIntuition = (struct IntuitionIFace *)IExec->GetInterface(IntuitionBase, "main", 1, NULL)))

    {

        IDOS->Printf("Failed to open required libraries or interfaces.\n");

        goto cleanup;

    }



    struct Screen *scr = IIntuition->LockPubScreen(NULL);

    if (!scr) {

        IDOS->Printf("Failed to lock public screen.\n");

        goto cleanup;

    }



    // Get real ModeID using GetVPModeID()

    ULONG modeid = IGraphics->GetVPModeID(&scr->ViewPort);



    struct DimensionInfo di;

    if (IGraphics->GetDisplayInfoData(NULL, (APTR)&di, sizeof(di), DTAG_DIMS, modeid)) {

        ULONG w = di.Nominal.MaxX - di.Nominal.MinX + 1;

        ULONG h = di.Nominal.MaxY - di.Nominal.MinY + 1;

        IDOS->Printf("ModeID: 0x%08lx, Width: %lu, Height: %lu\n", modeid, w, h);

    } else {

        IDOS->Printf("Failed to get display info for ModeID 0x%08lx\n", modeid);

    }



    IIntuition->UnlockPubScreen(NULL, scr);



cleanup:

    if (IIntuition) IExec->DropInterface((struct Interface *)IIntuition);

    if (IntuitionBase) IExec->CloseLibrary(IntuitionBase);

    if (IGraphics) IExec->DropInterface((struct Interface *)IGraphics);

    if (GraphicsBase) IExec->CloseLibrary(GraphicsBase);



    return RETURN_OK;

}

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rwo

Re: Getting DisplayID/ModeID info

Posted on: 2025/5/20 13:04 #3

Not too shy to talk

@kas1e

Yes.. this was exactly what I was looking for

Thank you

“The best thing about a boolean is even if you are wrong, you are only off by a bit.”

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