Add these gameboy shaders?

[Kudrun]

@edmaul69 . Hi, I'm trying to get the overlay you created (my modifying it) working on my Gameboy Zero 320x240 screen, but don't seem to be able to do it. I've come to the conclusion that because Gameboy is 160x144 and my screen is 320x240, there isn't much I can do. What would you recommend for my screen size in producing the most authentic gameboy experience?

[DieKatz]

Hi there,

this it, what i did, to let it look like a Classic Game Boy (Model: DMG-01) on a 1920x1080 screen:
This works without any shaders! So it performs very well on my Raspberry Pi.

Here's my overlay graphic including a half-transparent grid:

filed under "/opt/retropie/configs/all/retroarch/overlay/gb-case-grid.png"
(The design was inspired by the Super Game Boy theme on SNES.)

I created a file called "/opt/retropie/configs/all/retroarch/overlay/gb-case.cfg":

overlays = 1
overlay0_overlay = "gb-case-grid.png"
overlay0_full_screen = true
overlay0_descs = 0

...and added these lines to "/opt/retropie/configs/gb/retroarch.cfg":

video_smooth = "false"

aspect_ratio_index = "23"
custom_viewport_width = "960"
custom_viewport_height = "864"
custom_viewport_x = "480"
custom_viewport_y = "108"

input_overlay_enable = "true"
input_overlay = "/opt/retropie/configs/all/retroarch/overlay/gb-case.cfg"
input_overlay_opacity = "1.000000"
input_overlay_scale = "1.000000"

I also changed the default color palette in "/home/pi/RetroPie/BIOS/palettes/default.pal":

[General]
Background0=8094224
Background1=5929282
Background2=3758410
Background3=2703673
Sprite%2010=8094224
Sprite%2011=5929282
Sprite%2012=3758410
Sprite%2013=2703673
Sprite%2020=8094224
Sprite%2021=5929282
Sprite%2022=3758410
Sprite%2023=2703673

...cause it seems, that the lr-gambatte version in RetroPie 4.4 is a bit to old to use internal palettes like "GB - DMG", what was added to https://github.com/libretro/gambatte-libretro/blob/master/libgambatte/libretro/libretro.cpp on Oct 16, 2018.

So that's the result:

[ballboff]

this looks awesome. This has always been my bug bear with gameboy emulation, there was no authentic dot matrix display. Until now it has always just looks like 2 colours on a low res colour screen, but now it genuinely looks like an original dot matrix display.

[DieKatz]

Thank you very much!

So here is another version in a Game Boy Pocket style:

For this you'll need a different pallette:

[General]
Background0=13028261
Background1=9212523
Background2=4870457
Background3=1579032
Sprite%2010=13028261
Sprite%2011=9212523
Sprite%2012=4870457
Sprite%2013=1579032
Sprite%2020=13028261
Sprite%2021=9212523
Sprite%2022=4870457
Sprite%2023=1579032

...and then it looks like this:

[cyperghost]

@DieKatz Awesome even I do like the DMG-01 shader lots more. Thanks for your work!

[rgatz41]

i used this setup as well and its really awesome. im having a small issue with mine. im missing the edges that its cutting a small amount of the video screen (not the shader) on each side.

[Yarmongrel]

Wow, that Dot Matrix filter in the OP looks about as good as the one used by M2 on the Castlevania Anniversary Collection!

[matchaman]

I wonder if the OP shaders will work nowadays on the Pi 4 with a little tweaking. I suppose there's enough horsepower now.

[r4izuk0]

@diekatz anyway to make that bezel fully transparent? I followed your instructions exactly and the bezel just completely covers the game screen

[momaw27]

All credit goes to @DieKatz for the bulk of the work.

Here's my contribution: A GBC overlay, modded from @DieKatz awesome PGB overlay found above.

[Crimson-King012]

@momaw27 i know this is quite old, but I decided to make a Gameboy color border of my own, because the green one is too small, credit goes to @DieKatz for the Gameboy Pocket border, along with @momaw27 for the Gameboy Color Logo.