Hacking Bilinear Filtering in PSP emulators

[casino12]

First : Sorry for my english, i know it's terrible but you guys are my only hope

I bought PSP Go two days ago, everything is perfect etc.
But text in every emulator ( except MasterBoy V2.10 ) i use is garbage.
Let's say - i use s9xTYLmecm_mod and wanna play Chrono trigger.
I load the rom with no problems, but when the text come out it is ugly pixelated.
The bilinear filtering/smoothing fix it, but then the game look washed out and ugly.

I have the same problem with GBSP. Again, the bilinear filtering fix it.


Is there any way to fix this or it is normal?

Again, sorry for my english, i hope you understand.

 

[VGA]

It is normal, it is the same in PC emulators, bilinear filtering smoothes out the pixels, but it makes it look washed out. The thing is that bilinear filtering is done on the hardware so it doesn't cost anything performance-wise. Some super filter that smoothes the gfx and does sharpening would be too much for the psp's CPU to do for every single frame.

Best results are on PC emulators with shader filters.

 

[casino12]

So there isn' any way to have normal looking game without bilinear filtering?
So everybody play games in emulators with bilinear filtering ?

 

[VGA]

Well, yes, the original games are low-resolution. It's not that bad looking, though ! You can get used to it.

Try changing the screen options in the emulators (I mean fullscreen, scaled, etc)
Maybe you will find some setting that looks better with bilinear filtering to you.

 

[TecXero]

I prefer bilinear filtering disabled. Yeah it's pixelated, but that doesn't bother me. The only thing I can really recommend is get used to it or change the scaling to 100%. It'll display at the original resolution of the GBA, it won't be pixelated or washed out. The only drawback is it'll appear rather small on your display, due to the PSP having a much higher pixel density.

 

[casino12]

I don't mind pixelatization, but the text in games is messy.
Tomorrow i try take a photo of it.

 

[tvoretz]

Does the text kind of look like this?

That's just what happens when you enlarge an image without filtering. To fit the larger screen size, the original image is blown up and then smashed together. In the process, some parts of the (enlarged) image are straight up lost. There are no spare pixels to show them in. This can be avoided by magnifying the image a square number of times (2^2, 3^2, etc.) 2^2, for example, makes each in-game pixel show as four pixels on the screen, like this:

Most systems use a resolution too high for that to be practical on the PSP, though. If you did that, the PSP's screen would be filled, but the edges of the game would be cut off. The Gameboy's resolution is low enough that only four pixels should be missing from the top and bottom if you did this. That may be why Masterboy looks fine, or maybe the exact combination of the fonts used in the Gameboy games you're playing and the scaling required to fill the screen just happens to not reveal its losses too badly by coincidence.

The only ways to fix the problem are making the image a square number of times larger, using the filter, or just leaving the games at their original size (leaving most of the PSP's screen blank).

 

[Jayro]

I prefer the bi-linear filtering. The games look much easier on the eyes.

 

[VGA]

Yes, but the image loses its sharpness. No other solution, though , so...