Search found 65 matches

by paulbnl
Fri Oct 11, 2019 9:38 pm
Forum: MiSTer
Topic: Scaler
Replies: 406
Views: 71746

Re: Scaler

This part is a timing bottleneck: https://github.com/MiSTer-devel/Menu_MiSTer/blob/c103be9225dfabfea58244e1245a0961809a0e04/sys/ascal.vhd#L1712-L1713 Line 1712 o_hburst<=(o_ihsize * (to_integer(o_format(2 DOWNTO 0)) - 2) + N_BURST - 1) / N_BURST; Changing it to below increases the Fmax of pll_hdmi f...
by paulbnl
Fri Oct 11, 2019 5:22 pm
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

The ADV dsp is just basic multiplication/division so it is not suitable for gamma correction.

Can we re-use the scaler's 8bit palette to use as LUT?
by paulbnl
Mon Oct 07, 2019 11:20 am
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

JamesF wrote:Are you going to PR it so Sorgelig can review it?


Sure, I just had to figure out how to add scrolling to the system menu but now that's working properly I have sent the pull requests.
by paulbnl
Sun Oct 06, 2019 10:09 am
Forum: MiSTer
Topic: TV CRT via addon not working anymore
Replies: 11
Views: 716

Re: TV CRT via addon not working anymore

It looks like the video is being scaled on the MiSTer. Do you have vga_scaler=1 set?
by paulbnl
Sat Oct 05, 2019 6:55 pm
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

I have updated the link with updated cores. You'll need to copy the Gamma folder to the sdcard and replace the MiSTer binary for the Gamma correction option to appear under Scaling Filter. The txt files for the gamma curves are just 256 lines of values 0-255. The Genesis is now also included because...
by paulbnl
Fri Oct 04, 2019 10:18 am
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

I just want to remind: if it will use LUT for gamma correction it's very unlikely will be integrated into framework as it will produce a lot of timing violataions at 148MHz. For framework integration this LUT needs to be highly optimized with pipe-lining to cope with high HDMI data rate. Sure I can...
by paulbnl
Thu Oct 03, 2019 6:28 pm
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

I am going to make it like the scaling filters so we can just use txt files for the different curves.

It is better than having fixed curves in the core.
by paulbnl
Wed Oct 02, 2019 9:44 pm
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

Again, these 1.2-1.4 number which result in 2.64 to 3.08 gamma is a ridiculously wrong thing to do,, especially if it is baked into the core. I understand you advocate for this because for some reason it looks good on your display to your eyes (very subjective), but we don't want something like thi...
by paulbnl
Tue Oct 01, 2019 10:31 am
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

1.3 and 1.4 equals to a gamma (transfer function) of 2.86 and 3.08 which no display has/had, CRT or otherwise, regardless how good it looks to you. I think the problem here is most LCD displays start deviating from 2.2 for the black shades and become closer to a gamma of 1 (brighter) as the shades ...
by paulbnl
Mon Sep 30, 2019 3:44 pm
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

Ok I have added another build that goes from 1.1 to 1.3. Although I find the difference between 1.0 and 1.1 to be very small.

I prefer the 1.3 setting myself. It looks similar to my CRT.
by paulbnl
Sun Sep 29, 2019 7:29 pm
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

I have added a new build to the link which has a selectable gamma correction. Unfortunately because the correction now happens at the core side the analog output is also affected by the gamma correction so directly comparing a CRT with an LCD is not possible. https://drive.google.com/file/d/12FrBLfY...
by paulbnl
Sun Sep 29, 2019 10:10 am
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

CRT gamma ranged from 2.1 to 2.5, depending on where you set your 'brightness' control. A well behaving studio CRT is standard 2.2 with clearly visible black shades, just like well behaved IPS LCD panel. Those 'gamma corrected' images in the first post are way too dark, actually, my sony trinitron ...
by paulbnl
Sat Sep 28, 2019 9:27 pm
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

Because of this issue of calibration there will be no reliable feedback from users unless they have calibrated screens that can at least do 100% sRGB (my BenQ gaming monitor has only about 90% and it shows). Thus I looked at the gamma corrected images on a hardware calibrated Eizo in sRGB mode and ...
by paulbnl
Sat Sep 28, 2019 10:01 am
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

I like the idea! It may be because of the camera but the CRT images in the link are awful and in no way representative of a good CRT image. Was the CRT and LCD screen calibrated? Or how did you determine the gamma value? On my benq gaming monitor the gamma core looks too dark and many details are l...
by paulbnl
Sat Sep 28, 2019 9:38 am
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

Sorgelig wrote:Gamma corrected looks like cheap monitor with weird colors ;)


If you say cheap monitor then I think about washed out colors which describes the screenshots with original colors. Imgur doesn't show the descriptions clearly but the darker screenshots are the corrected ones.
by paulbnl
Sat Sep 28, 2019 9:14 am
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Re: Gamma correction

Those screenshots look good. Is that just a normal gamma correction of (RGB)^(2.5/2.2) or so? I did that to the Genesis core a while back and nobody seemed interested then. Btw, Grabulosaure indicated in the past that ACAL's support for paletted color could be used for gamma correction without addi...
by paulbnl
Fri Sep 27, 2019 10:51 pm
Forum: MiSTer
Topic: Gamma correction
Replies: 53
Views: 2623

Gamma correction

Back in the day graphic designers were making content that was viewed on a CRT. A CRT has a very different gamma curve compared to an LCD display. Low and mid-tones are much darker on a CRT. So the designers compensated for this by brightening the darker parts. If the content is viewed on an LCD the...
by paulbnl
Thu Sep 26, 2019 10:26 am
Forum: MiSTer
Topic: SNES core
Replies: 357
Views: 83118

Re: SNES core

Vegas Stakes is doing something weird for me with the latest update - when you enter a casino you should get a zoom effect like this . Currently the image seems to split vertically when the zooming starts . It still zooms, it's just like the screen has been cut 60/40 and then the two sides switched...
by paulbnl
Mon Sep 23, 2019 9:45 am
Forum: MiSTer
Topic: MISTer (Main Core)
Replies: 290
Views: 51778

Re: MISTer (Main Core)

MiSTer.ini location has been moved to the root like 2 years ago may be... It was used from there for legacy purpose. config folder is only for files automatically created and managed internally and not requiring manual editing. The wiki today still states in Setup guide page and Configuration files...
by paulbnl
Mon Sep 09, 2019 5:47 pm
Forum: MiSTer
Topic: NeoGeo topic
Replies: 179
Views: 16774

Re: NeoGeo topic

LarsDragon wrote:It is even better than my original NeoGeo :D


If it is better than your original NeoGeo then that is not good :) It should be exactly the same.

So build 2 is still the closest to your original NeoGeo?
by paulbnl
Mon Sep 09, 2019 5:25 pm
Forum: MiSTer
Topic: NeoGeo topic
Replies: 179
Views: 16774

Re: NeoGeo topic

I gave the third build a shot. I have a slight geometry issue on my TV and some pixels in the lower right corner were cutoff in that one. The first build is the only one that showed all the text on the left and right "credit" lines. To be sure, you are comparing MiSTer to a real Neogeo co...
by paulbnl
Mon Sep 09, 2019 4:05 pm
Forum: MiSTer
Topic: NeoGeo topic
Replies: 179
Views: 16774

Re: NeoGeo topic

I tried both files and NeoGeo_vsync1.rbf worked the best on my TV. It looked like all the pixels were showing. When I tried the NeoGeo_vsync2.rbf file there was still about 1 or 2 lines of pixels missing at the bottom of the screen in Metal Slug. Essentially this cut off some of the "Credit&qu...
by paulbnl
Mon Sep 09, 2019 3:30 pm
Forum: MiSTer
Topic: NeoGeo topic
Replies: 179
Views: 16774

Re: NeoGeo topic

LarsDragon wrote:Of course!


Try these builds and see which is best:
https://drive.google.com/file/d/1dHM_xMT5o0IIID8G332PhngiBm6Fjfif/view?usp=sharing
by paulbnl
Mon Sep 09, 2019 9:08 am
Forum: MiSTer
Topic: NeoGeo topic
Replies: 179
Views: 16774

Re: NeoGeo topic

I understand that this may be insignificant, but I think that the vertical alignment on analog output 15khz is not correct, it is shifted down and normally cuts the credit information. I know it can be adjusted with the geometry of the TV, but in my original NeoGeo console this does not happen, ¿pe...
by paulbnl
Sat Sep 07, 2019 4:40 pm
Forum: MiSTer
Topic: NeoGeo topic
Replies: 179
Views: 16774

Re: NeoGeo topic

Using a mame romset I converted breakrev, fatfursp, mslug, mslug2, neodrift, samsho, samsho2, turfmast, wjammers. From those only Fatal Fury, Metal Slug 2, Samurai Spirits and Wind Jammers start. Metal Slug has a 2MB prom. I found out you need to reverse the top and bottom 1MB half and then it works.

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