Indigo 2 GR3-Elan 24bit?

retronav

New member
Dec 8, 2022
14
10
3
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

Active member
Sep 23, 2020
196
137
43
Switzerland
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

New member
Dec 8, 2022
14
10
3
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

Member
Jun 30, 2020
33
20
8
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

New member
Dec 8, 2022
14
10
3
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

Administrator
Apr 18, 2020
88
23
8
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

Member
Jun 30, 2020
33
20
8
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

New member
Dec 8, 2022
14
10
3
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
 

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