Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-21, 09:53

by

by kjliew

in DOSBox Development

in DOSBox Development

Updated 1st post with dpiscale v2 patch. There is a winner at last to obtain DPI scale without abusing dosbox.conf. OpenGL says the initial viewport width/height is set to the same width/height of the window. So DOSBox just has to read them back with glGet() and derive DPI scale from there, simple! …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-21, 06:27

by

by kjliew

in DOSBox Development

in DOSBox Development

Updated 1st post to separate OpenGL DPI scaling fix from CPU core dynrec. Shamelessly abuse dosbox.conf for DPI scale. So this thread provides everything for a kick *ss DOSBox SVN for Apple M1 native AArch64 build, simple & minimalist solution for DOSBox SVN. Have fun! 😀

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-20, 21:25

by

by kjliew

in DOSBox Development

in DOSBox Development

DOSBox-X uses a heavily modified SDL1.2 that includes high DPI awareness in Windows and Mac OS X and a workaround that still works in Big Sur . You really can't make that claim when DOSBox-X issue #1697 remains opened. And I am also pretty sure that high DPI awareness has never been working for …

---

Re: Very old Linux native games on modern Linux

Posted on 2021-07-20, 21:17

by

by kjliew

in Milliways

in Milliways

It's actually codified in the first two rules of Linux kernel development and maintenance, as hammered into developers' minds by Linus Torvalds : "The First Rule of Linux kernel development: You do not break userspace." "The Second Rule of Linux kernel development: YOU DO NOT. BREAK. USERSPACE." …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-20, 20:33

by

by kjliew

in DOSBox Development

in DOSBox Development

DOSBox-X uses a heavily modified SDL1.2 that includes high DPI awareness in Windows and Mac OS X and a workaround that still works in Big Sur . You really can't make that claim when DOSBox-X issue #1697 remains opened. And I am also pretty sure that high DPI awareness has never been working for …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-20, 04:51

by

by kjliew

in DOSBox Development

in DOSBox Development

DOSBox-X issue #2478 -- look like SDL2 also exhibits the same problem with OpenGL display. This is a stronger evidence that no SDL1.2 should ever pick up the fix, not even SDL2 will fix it for everyone in a transparent way to deal with display scaling. But SDL2 does have APIs to obtain window size …

---

Re: Very old Linux native games on modern Linux

Posted on 2021-07-20, 00:04

by

by kjliew

in Milliways

in Milliways

I should imagine if the game soiurce code was available it shouldn't be too hard t0 bring the game up to be used on later LINUX/8nix. I mean the source files in KDE 1 were compiled to run on newer kit about 6 years or so ago to calibrate an anniversary of its creation.. Not true for un-maintained …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-19, 23:00

by

by kjliew

in DOSBox Development

in DOSBox Development

If brew added the SDL git fix, then it broke the apps that assume the same windowing clipping can be used for drawable and pointer, and DOSBox happens to be one of them. If they don't add it, it's also broken. I'm pretty sure the only reason they didn't add it is because there are so few SDL 1.2 …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-19, 22:14

by

by kjliew

in DOSBox Development

in DOSBox Development

I came to realize that Apple indeed has smart brass in charge of the OpenGL SDK or just another coincidence. Unlike macOS, OpenGL in Windows 10 is subjected to display scaling so the GL drawable size and pointer clipping will be out-of-sync. But Windows 10 allows display scaling to be turned off …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-19, 21:08

by

by kjliew

in DOSBox Development

in DOSBox Development

Problem is that this will eventually be added to brew or macports and thus it will break Dosbox again. Fix it in the source and not in Dosbox ;) I don't believe that this will be added. Whether it was just coincidence or the issue was well understood, SDL1.2 is just not being DPI-aware. That's why …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-19, 20:15

by

by kjliew

in DOSBox Development

in DOSBox Development

Thanks, at least I knew the problem well since 2018 ;) when I quietly weep after getting a 24" 2K panel. At least the mouse motion packet from SDL1.2 is still returning sane data in {x, y, x-rel, y-rel} for macOS, unlike Windows 10, they are just in real screen pixels instead of the width/height …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-19, 08:41

by

by kjliew

in DOSBox Development

in DOSBox Development

Problem is that this will eventually be added to brew or macports and thus it will break Dosbox again. Fix it in the source and not in Dosbox ;) Have you tried SDL 1.2 git or just applied that patch? Do you mean that SDL 1.2 git already have both the display scaling and mouse motion managed …

---

Re: DOSBox SVN r4168 mouse cursor malfunction with Windows 10 display scaling

Posted on 2021-07-19, 04:15

by

by kjliew

in DOSBox General

in DOSBox General

Bumping up the thread. The macOS's look & design artistic on the retina display may have helped to reach a solution for Windows 10 display scaling. Problem: SDL1.2 mouse motion events always come in real screen pixels for x, x-relative, y and y-relative. DOSBox setups sdl.clip.w & sdl.clip.h based …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-19, 01:41

by

by kjliew

in DOSBox Development

in DOSBox Development

It looked like DOSBox already managed its mouse motion, so just need to make sure sdl.clip.w and sdl.clip.h have the correct size corresponding to mouse motion in real screen pixels. Incidentally, sdl.clip.w and sdl.clip.h are also used for glViewport() so having them in the correct size as real …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-18, 20:10

by

by kjliew

in DOSBox Development

in DOSBox Development

Per program fix was meant: per program that uses SDL 1.2x OK, now I understand the context of per program fix. Yes, you're right, every program that uses SDL1.2 has to shrink the window size or else for SDL_OPENGL they will have 1/4th of the rendered display at lower-left of the window. All SDL1.2 …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-18, 19:07

by

by kjliew

in DOSBox Development

in DOSBox Development

Dominus wrote on 2021-07-18, 19:03: Per program fix was meant: per program that uses SDL 1.2x No, when SDL1.2 didn't mess with display scaling. So all SDL1.2 programs are really DPI-unaware. They just become tiny rectangle for rich people using HiDPI display. I am on Liberachat IRC. 😉

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-18, 19:01

by

by kjliew

in DOSBox Development

in DOSBox Development

Can you elaborate how that problem manifests itself? I don't quite understand... Step #1 Get a game called Dune 2: Building of a Dynasty (1992) by Westwood Studio Step #2 Use an expensive 27" 4K/8K panel (... quietly weep) so *Display Scaling* becomes inevitable unless one was genetically modified …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-18, 11:51

by

by kjliew

in DOSBox Development

in DOSBox Development

Wait a minute, look like the SDL fix is not the holy grail after all. It just has the display scaled up without taking mouse motion into consideration *in windowed mode* . A good DOS game that will manifest this issue is Dune 2: Building of a Dynasty. Try to play it in windowed, use scaler=normal3x …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-18, 08:41

by

by kjliew

in DOSBox Development

in DOSBox Development

No! ;) Getting a port/formula approved is not fun. Doing it for something like SDL1.2 that has no new version... hard pass... Not a problem, I knew what kind of position that could be. So how did you do the macOS DMG type of DOSBox distribution? Static linking the SDL or always include the spiced …

---

Re: DOSBox SVN for Apple M1 Core Dynrec - A simple hack

Posted on 2021-07-18, 06:10

by

by kjliew

in DOSBox Development

in DOSBox Development

Sadly, the 3rd one is MIA. 🤣 Otherwise, it would show off the so-called true & authentic 3Dfx Voodoo rendering with 16-bit dithering, 2x2 filtering and all the accuracy goodies and "freaking fast". 😉

---