Re: Double-height and double-width

Posted on 2016-10-15, 23:04

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by Ant_222

in DOSBox Development

in DOSBox Development

The vgaonly machine type emulates certain details of real VGA cards that other VGA machine types do not. VGA has two basic scan types: 400 lines at ~70 Hz, and 480 lines at ~60 Hz; with most standard video modes based around these. In the case of 320x200, it is double-scanned to 400 lines, and the …

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Re: Overlay graphic output and audio distortion-slowdown

Posted on 2016-10-15, 18:19

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by Ant_222

in DOSBox Development

in DOSBox Development

mrau wrote: driver issues? did You try alternative OSes? Could be. I had a computer with a misconfigured video adapter. DOSBox worked on it with surface but crashed with overlay.

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Re: Overlay graphic output and audio distortion-slowdown

Posted on 2016-10-15, 17:55

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by Ant_222

in DOSBox Development

in DOSBox Development

As I understand, overlay relies partially on hardware and uses a color encoding which is connected with RGB via decimal operations. Either of these factors may cause the problem on your side.

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Re: DOSBox Feature Request Thread

Posted on 2016-10-15, 17:44

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by Ant_222

in DOSBox General

in DOSBox General

Like 90% of online images and videos are in the wrong aspect ratio. It's a battle you're not going to win. Having DOSBox resize to 4:3, sure call it unwise, but it will address the issue. Considering that 80% of those screenshots and videos are made with DOSBox, we can win. DOSBox may resize its …

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Re: DOSBox Feature Request Thread

Posted on 2016-10-15, 17:31

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by Ant_222

in DOSBox General

in DOSBox General

320x200 requires at least an 8x stretch to not lose data How is that? Assuming a 4x3 image, the pixel aspect ratio (PAR) of this graphical mode is: 3/4 * 320/200 = 1.2 , which requires at least 5x6 magnification and consequently a 1600x1200 display. The pixel-perfect patch will do that. Notice also …

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Re: Patch for pixel-perfect scaling [was:Full-screen mode]

Posted on 2016-10-15, 15:02

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by Ant_222

in DOSBox Patches

in DOSBox Patches

lightmaster wrote: Surfacenb, so nearest neighbor right? Right, does not openglnb work better for you?

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Double-height and double-width

Posted on 2016-10-15, 14:44

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by Ant_222

in DOSBox Development

in DOSBox Development

Hello, all What are the double-height and double-width modes? Are they part of the emulation of the video system or a mechanism implemented in DOSBox more effectively to use the available display area in case of non-scaling output surfaces? For example, when running Lure of the Temptress with svga_ …

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Re: Patch for pixel-perfect scaling [was:Full-screen mode]

Posted on 2016-10-15, 09:36

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by Ant_222

in DOSBox Patches

in DOSBox Patches

lightmaster wrote: Downloaded, thank you both!! It is great to know one's work is appreciated, but I should very much like to know which mode you are using—pixel-perfect, the lack whereof made me write patch and which I consider the one true mode for DOSBox, or nearest-neighbor or near-perfect?

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Re: Patch for pixel-perfect scaling [was:Full-screen mode]

Posted on 2016-10-14, 20:16

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by Ant_222

in DOSBox Patches

in DOSBox Patches

Yesterplay80 , see if the error persists in the alpha 7 . You seem to have hit the bug very, very hard, as everything seems to work now! Great job! :-D Thank you very much. I also uploaded a new version of my build including your alpha 7 patch. May I ask you once again to update your build with the …

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Re: Patch for pixel-perfect scaling [was:Full-screen mode]

Posted on 2016-10-13, 20:55

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by Ant_222

in DOSBox Patches

in DOSBox Patches

Yesterplay80, see if the error persists in the alpha 7.

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Re: Patch for pixel-perfect scaling [was:Full-screen mode]

Posted on 2016-10-13, 08:26

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by Ant_222

in DOSBox Patches

in DOSBox Patches

I found the culprit! I have set "fulldouble=false" under [sdl] in all my games. If I turn that off, it works, even with my enhanced build. If I leave it on, DOSBox crashes. Is that intended behaviour or should double buffering work with pixel perfect scaling as well? No, that is a bug, and I will …

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Re: Patch for pixel-perfect scaling [was:Full-screen mode]

Posted on 2016-10-12, 22:46

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by Ant_222

in DOSBox Patches

in DOSBox Patches

It might be just my PC, but DOSBox crashes every time when using "surfacepp", "surfacenp" or "surfacenb" as output. Very strange, because it works here. Attached is a self-contained test sample. What happens if you unpack it into an empty directory and run test.bat ? Btw., your MSYS installation …

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Re: Patch for pixel-perfect scaling [was:Full-screen mode]

Posted on 2016-10-11, 21:43

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by Ant_222

in DOSBox Patches

in DOSBox Patches

Alpha 5 uploaded. The patch has been rewritten for the surface output type, supports windowed mode and different machine types. While implementing support for all machine types I was disappointed to find out that some them, such as vgaonly , seem to apply internal pre-scaling that prevents my patch …

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Re: Patch for pixel-perfect scaling [was:Full-screen mode]

Posted on 2016-10-10, 13:54

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by Ant_222

in DOSBox Patches

in DOSBox Patches

Even doing the diffs is much easier when all the files are in SVN. I don't konw how exactly it works, but SVN offers the option to make your own fork of a project. Would that help you? It would help with the diffs, but whereas forks tend to diverge, I still shall have a hard time maintaining a …

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Re: Patch for pixel-perfect scaling [was:Full-screen mode]

Posted on 2016-10-10, 13:33

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by Ant_222

in DOSBox Patches

in DOSBox Patches

Thank you Ant_222 and Yesterplay80! I freaking love the DOSBox Enhanced build. I am right glad to know that my work is appreciated. Although I don't quite understand why the holdup for implementing some basic (but essential) patches that many people use for many years now to the official SVN... : …

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Re: Patch for pixel-perfect scaling [was:Full-screen mode]

Posted on 2016-10-10, 09:17

by

by Ant_222

in DOSBox Patches

in DOSBox Patches

Thanks, I shall re-apply those changes manually.

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Re: Patch for pixel-perfect scaling [was:Full-screen mode]

Posted on 2016-10-10, 08:59

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by Ant_222

in DOSBox Patches

in DOSBox Patches

Thank you, Yesterplay80. I will find the author of the change and contant him. I will post the alpha 5 anyway so as to have the latest version here for everybody's reference. I shall be grateful if you produce a build from it based on an ealier SVN revision, because I don't know how much time or …

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Re: Patch for pixel-perfect scaling [was:Full-screen mode]

Posted on 2016-10-09, 20:39

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by Ant_222

in DOSBox Patches

in DOSBox Patches

FYI: I just tried to compile r4000 with your patch, but the file sdlmain.cpp underwent several changes in r3999 and hunks #12 and #13 of your patch won't apply any more. Thanks for letting me know, but that is ill tidings indeed. Just yesterday I completed alpha 5, where a bug is fixed and the …

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Re: DOSBox SVN Builds

Posted on 2016-09-21, 15:02

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by Ant_222

in DOSBox Development

in DOSBox Development

Did I forget one/some? No, nothing of the sort. It's just that the instructions for my patch in PATCHES.txt are very condensed and I feared it might have misled Taiyoumaru . If so, I'm sorry, I just added your readme to the archive, just to make sure. Thank you kindly. Taiyoumaru , you shall find …

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Re: DOSBox SVN Builds

Posted on 2016-09-21, 14:15

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by Ant_222

in DOSBox Development

in DOSBox Development

ICould you please list all the available modes with your latest patch? They are listed in the readme file in the archive . Maybe Yesterplay80 should not have abridged it in the instructions for his enhanced build? From what I gather there's overlaypp, overlaynp and overlayhq? And I am correct in …

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