Thanks a lot for your help so far. Unfortunately, I didn't manage to set the configuration how I want to yet.
The people who suggested to use another version of MAME: Thanks, but I'd really like to use the standard version. I mean, there must be an option for what I need. That's the default behavior of every emulator. FCE Ultra, Nestopia, ZSNES, Visual Boy Advance. They all show fullscreen the way I described (with integer stretching and black bars on all four sides). So, I cannot imagine MAME simply not having it. Especially since you can enable it with DirectDraw. And if GameEX does this by default, there must be a way to find out the plain command line call for it. But just using a completely different product shouldn't be the alternative.
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Then after launching a game press TAB/video options and you will be able to get things exactly how you want it.
Sorry, it didn't work. I used the options you gave me and then I went into the video options. But whatever I choose, the height of the screen is always completely filled. What do I have to do exactly?
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He needs to keep whatever his current settings are and set prescale to 2 or 3.
Prescale only determines how much the image is scaled in memory before it is drawn to the screen, removing blurriness while still leaving the bilinear filter intact. But as far as I see, it has no influence on the actual size of the image on the screen. The final image is still stretched to the whole height.
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I'm pretty sure the options that the OP is looking for is:
mame gamename -video ddraw -nohwstretch
Yes, that's what I'm looking for. But this option uses the old, outdated DirectDraw render method. And I was actually looking for a version to do this in Direct3D.
Is there really no possibility to leave the vertical stretching at an integer ratio? I mean, they have options for horizontal stretching: I can fill the whole screen, I can opt for a 4:3 ratio, I can use the native ratio. All of them resulting either in no black bars at all or in black bars of various size. So, they offered all this for horizontal stretching. But why is it so hard to find out how to do the same for vertical stretching?
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