Dark Bit Factory & Gravity

GENERAL => Projects => Topic started by: Shockwave on February 06, 2011

Title: Opengl slow-down when mouse moved
Post by: Shockwave on February 06, 2011

I don't know whether I have set this framework up wrongly..

On my own computer there are no problems at all, it runs very smooth.
I tried it on a friends computer though and whenever I moved the mouse the whole thing judders horribly.

When the mouse is left in one place it's totally smooth..

As it doesn't happen on my computer it's a bit of a tricky one to fix.
Can anyone see anything wrong with the code?  It uses RBZ's fixed framework.

Title: Re: Opengl slow-down when mouse moved
Post by: LittleWhite on February 06, 2011

I am on GNU/Linux so I didn't test the program.
But I am supposing that it is because of the message loop, stopping a bit the program.
The problem is certainly that for each pixel, the message loop receives one message. So if you are moving, let's say, 1000 pixels, you have 1000 messages to process (Wow ... a lot).

Title: Re: Opengl slow-down when mouse moved
Post by: Xetick on February 06, 2011

LittleWhite: In windows you dont get a message per pixel moved unless that framework works differently.

But I do wonder about the message loop also

Code: [Select]


      if (PeekMessage (@wMsg,NULL,0,0,PM_REMOVE) <> 0) then
            DispatchMessage(@wMsg)
        else
            OLD=TIMER
            glDraw()
            SwapBuffers (hdcWin)
            DV=TIMER-OLD
        end if
Since DV looks like it should be "deltatime" but as written it shouldn't be that. Since it doesn't include the time used by any message processing. Moving the DV calculation above the OLD=TIMER might work better. Could be worth a try.

BTW. The program works without problem here

Title: Re: Opengl slow-down when mouse moved
Post by: Shockwave on February 06, 2011

Hmm, ok it could well be deltatime, it won't harm to move the command around :)

Cheers guys!

Title: Re: Opengl slow-down when mouse moved
Post by: Rbz on February 06, 2011

Hi Shock, try this and see if it minimize this problem:

Code: [Select]

    while(wMsg.message <> WM_QUIT)

        if (PeekMessage (@wMsg,NULL,0,0,PM_REMOVE) <> 0) then
            DispatchMessage(@wMsg)
            DV=TIMER-OLD 'fixed: update timer when window process a message
        else
            OLD=TIMER
            glDraw()
            SwapBuffers (hdcWin)
            DV=TIMER-OLD
        end if
       
    wend

Title: Re: Opengl slow-down when mouse moved
Post by: Shockwave on February 06, 2011

Thanks RBZ :)

I'll try this when I next have access to my friends computer. In the meantime K+ for all of you.
Thanks for helping an old man :)

Title: Re: Opengl slow-down when mouse moved
Post by: rain_storm on February 06, 2011

My guese was that you failed to return a value of zero in response to WM_MOUSEMOVE messages, but after looking through the disassembly I see that you forward all messages to DefWindowProc, my basic is getting rusty.

Title: Re: Opengl slow-down when mouse moved
Post by: Shockwave on February 06, 2011

In typical fashion of me Rain Storm it's been so long since I wrote anything resembling a demo that I have no fucking clue about what handles the windows messages.. It's RBZ's framework anyway :)

I'll be happy if the fix has stopped the glitch and then perhaps I can move on to doing something else ..