Indigo 2 GR3-Elan 24bit?

[retronav]

Hi All.
've recently bought Indogo 2 with GR3-Elan (R4400) and run some demos for start.
I'm wondering if this machine really has 24 bit gfx display? When running demos like powerflip, etc I can see dithered, flat shaded objects. Is this suppose to be displayed like this?
I think that on my Octane 2 it looks smother.

 

[flexion]

check if you have set "-depth 24 -class TrueColor" in: /usr/lib/X11/xdm/Xservers

:0 secure /usr/bin/X11/X -bs -nobitscale -c -solidroot sgilightblue -cursorFG red -cursorBG white -depth 24 -class TrueColor

 

[retronav]

well. looks like this -depth 24 switch is not there in my Xservers File. I added this and xdpyinfo now tells me I have 24 bit TrueColor visual, but I think the power flip still looks dithered, or is it?

 

[drmadison]

I'm not super familiar with that graphics board. I do know that the Indy 24bit graphics for instance is a fixed 24 bit planes, which means if you use double-buffered visuals, it drops down to 12-bit (per buffer). This might be similar for the Elan board and explain what you're seeing?

 

[retronav]

Thanks for reply. I've asked on Discrord channel to and they gave me hints of how to setup the Xservers file, which I did. But IMO it doesnt change anything. So my guess is that powerflip demo maybe just renders the rotating objects with this dithering that I see. IT's best seen when I add the clipping plane. Actually I see the same result on Indigo with Elan and on Octane2 with V6 cards.

 

[jenna64bit]

It may well be. In Irix the reason the desktop defaults to 8bit is that any application can request its own desired color depth. So, entirely possible powerflip nabs an 8 bit OpenGL window.

 

[drmadison]

Wait... if you're seeing it on VPro graphics, do you have the "fast transparency" setting on where it draws transparent surfaces as stippled polys instead of actual transparency? Can you post a screenshot of what you're seeing?

 

[retronav]

I don't know if I have this "fast transparency" set up. where do I check and set it?
I will do the screenshot tomorrow and try to post it here. TIA