pouët.net

I'm new to the scene and i'm searching some documents to learn 2d graphics programming, i'm a gbc coder, and i'm trying to do some nice effects like plasmas and tunnels, but i can't understand how to do them on a tile system like gbc.

here you could find something useful.
Watch also there.

you just have to set up the tiles in a nice way. On gbc you can cover the whole screen with unique tiles but to find the tile at x-coordinate is not so elegant this way.
There is also a standard tile-map called APA which is defines a 128x128 bitmap in the middle of the lcd where you can very easily find the right bytes. You should find info on that on the internet.

Of course, if you implement the effects broderick linked to per pixel with some c2p routine they will run extremely slow.

Just learn how the effect you want to code works and adapt it to gbc. It's impossible to know exactly what you mean by "tunnel" and "plasma".

An ugly way to decrease computation is to set up chardata so the effects run in 4x4-pixel blocks.. then you can dump your effect directly in $9800/$9c00.

maybe you wanna do some raster effects first. they're easier and can look cool.

Broderick: Entertaining reading!
I esp. liked:
http://freespace.virgin.net/hugo.elias/graphics/x_shadow.htm >D

hahaha :DD
maybe i should email the author that matrices exist...
or meybe leave him in blissful ignorance of them instead ?...

you could have a look at some sourcecode

another tip is to watch gb-demos in an emulator and open the vram-viewer... both nocash and bgb has this feature

Lol, I haven't used matrices in my 3d engine yet. What are the benefits anyways? ;)

thank you :)
i'll try some raster first!