5 replies to this topic

[Tylerburrito]

Okay, so I'm making a game, and it doubles the actual screen size so that the game is more visible. (I have used both 200% fixed width in the settings and using view ports)

I've used Game Maker for about 7 years, and I'm just now noticing this.



As you can see above, it looks fine! Each pixel is double in size, bringing the resolution up from 360x260 to 720x520.

However, when I run it on my Windows...



Sprite glitches, tile glitches, everything glitches. What in the world is happening? Is there a way to turn antialiasing or interpolation or whatever the game's graphics are doing off?

Edited by Tylerburrito, 09 May 2012 - 01:49 AM.

[Gamer3D]

"Seamless tile scaling in GameMaker"

[Tylerburrito]

So why do the sprites look glitchy as well?

Edited by Tylerburrito, 09 May 2012 - 01:57 AM.

[Furritus]

are those two different things, the brightness and colors seem off on one. but look through global game settings i thinkethere was something about interpolation in there

[Gamer3D]

I thought you didn't like the black outlines on your transparent tiles.

The incorrect scaling on some pixels is the result of nearest-neighbor filtering. When the GPU tries to find the color of a given pixel, it finds a real-valued uv-coordinate pair (eg <0.7, 0.3>) for each pixel. It then chooses a pixel by multiplying by texture (Note: NOT SPRITE/BACKGROUND) width and height, then rounding down. (If it's outside the texture, it can either clamp or wrap the coordinates).

[xot]

ChevyRay has a pretty good solution to this sort of problem using surfaces. Drops right into most games without any other changes.

http://forums.tigsou...g86809#msg86809

It's a very useful technique that can be applied other kinds of post-processing effects.