An all in one editor for the Sega Genesis
Why not SGDK?
It's your choice if you would rather code in C or assembly!
Personally I think SGDK is an AMAZING project that you should try out!
GenesisEdit has macros like %IF% and %SPRITE% to make coding way easier!
Sprites and Backgrounds will automatically compile into the CODE.S file
Backgrounds are converted to this format:
| 1 | 2 | 3 |
| 4 | 5 | 6 |
| 7 | 8 | 9 |
But sprites go like this:
| 1 | 4 | 7 |
| 2 | 5 | 8 |
| 3 | 6 | 9 |
Seems simple, but GenesisEdit internally represents characters (8x8 groups of pixels) in the background format to make things simple.
Get an array of indexes into the character array that when the indexes are swapped with characters it converts it to sprite format.
{ 1, 4, 7, 2, 5, 8, 3, 6, 9 }
Given w, the width of the image in characters, and going from top down, each element is a multiple of w + some value that increases by one on each row.
This means we can create a list from 0 to the number of characters - 1.
Luckily, Enumerable.Range(0, chars.Length) gives us what we want.
Then we can sort it by its divisibility by w, so:
- 0 % 3 = 0
- 1 % 3 = 1
- 2 % 3 = 2
- 3 % 3 = 0
- 4 % 3 = 1
- 5 % 3 = 2
- ...
Becomes:
- 0 % 3 = 0
- 3 % 3 = 0
- 1 % 3 = 1
- 4 % 3 = 1
- 2 % 3 = 2
- 5 % 3 = 2
- ...
etc.
Puting this into a table:
| 0 | 3 | 6 |
| 1 | 4 | 7 |
| 2 | 5 | 8 |
int[] indexes = Enumerable.Range(0, chars.Count).OrderBy(i => i % (b.Width / 8)).ToArray();
Bitmap[] temp = new Bitmap[chars.Count];
for (int i = 0; i < chars.Count; i++)
{
UpdateProgress($"Transforming {i + 1} -> {indexes[i] + 1}");
temp[i] = chars[indexes[i]];
PROGRESS++;
}
return temp.ToList();
Variables can be created with 3 different types: Byte, Word, and Long, each having a different size (anything greater than one makes it an array)
They can only have a name that matches this regex: [A-Za-z_][A-Za-z_0-9]*
For those who don't understand regex, names must start with a letter or an underscore, then you can put letters, numbers, and underscores after the first character.
Variables are referenced by typing %<NAME>%
EX:
ADD.W #42,D0
MOVE.W D0,%MyVariable%
When compiled it becomes:
ADD.W #42,D0
MOVE.W D0,GE_USER_MyVariable
The definition at the top of CODE.S:
GE_USER_MyVariable RC.W 1
HUGE credit to a Youtuber named GameHut for inspiring this project.
The SYSTEM.S file was used from the tutorial, along with snippets from the main GAMEHUT.S file