need to output tilemap bigger than 256x224 or output two tilemaps

[gizaha]

Hello. I have a picture 256x448, i need to output two 256x224 tilemaps.
I don't use tile reduction, so the upper picture tileset is $7000 length, and the same for the lower.

I understand that a single tilemap cannot address 256x448, so i need two tilemaps of 256x224 each and using the common palette.
So i cannot split the image in two and edit two seperate images because it's the same image that will be scrolled.
During streaming tileset+tilemap data will be updated and the scroll register shifts. Pallete must be unchanged because it will be accessed from the remaining tiles.

Another solution would be to convert a 256x224 picture while using an input palette file from another picture.

[alekmaul]

I do not understand what you want exacty and why ytou open an issue for that, sorry.
Perhaps it could be better to go on pvsneslib discord for your question ?

[gizaha]

I want a vertical scrolling background 32x64 with pixel length 256x448.
Tileset and tilemap would be streamed each frame while scrolling.
I opened an issue because i run gfx2snes at a 256x448 picture and the tilemap it extracted wasn't right (thus bug of the program).

[alekmaul]

ok, I will check gfx2snes. If you have a code example, it could help a lot :)

[gizaha]

sample.zip
Here is a sample. Try gfx2snes to this image and put output data to bsnes to see the problem.

I need two tilemaps but pointing to common palette (if i split the image in two and make them seperately, then different palettes will be created).

For code example is not very clean and comments are in greek, so it will not help you. After all, is a tile streaming scroll as in most games.

Thank you.

[daniel-starke]

The issue appears to be an invalid memory access in

pvsneslib/tools/gfx2snes/imgtools.c

Line 223 in 862adbf

map[idx] = t;

and

pvsneslib/tools/gfx2snes/imgtools.c

Line 387 in 862adbf

map[idx] += t;

due to the fact that it tries to initializes all 32x32 tiles but allocates only as many tiles as it derived from the input image dimensions in

pvsneslib/tools/gfx2snes/imgtools.c

Line 159 in 862adbf

map = malloc((size_t)tile_x * tile_y * sizeof(int));

[alekmaul]

thanks for your reply, I will try to check this issue this week