How do you handle 4 bits Bitmap ?

[KanedaFr]

Hi there,

 

I'd like to use 16 colors bitmap (4bpp) but whatever I tried, it's a fail.

i have no problem with 256 8bpp but I'd like to use pals more efficiency

 

Imagemagick identify ouput:

 

clouds.bmp BMP3 200x128 200x128+0+0 4-bit sRGB 16c 12918B 0.000u 0:00.003

 

 

build.log output:

Processing ASSETS\GFX\clouds.bmp
        Converting BMP internally into gfxdata/clut...
        File is 200 pixels wide, 128 pixels high and is 4 bits/pixel

 

cloud.bmp.clut is ok

cloud.bmp.gfxdata is ok

 

R_sprite_framesz is h*w/2

R_sprite_bytewid is w/2

R_sprite_gwidth is w/2

R_sprite_bdepth is 4

 

 

Did I miss something ?

What could I look for ?

 

(if I remove the /2 , I start to see something with the right colors but not the wanted bitmap)

 

 

 

[KanedaFr]

I tried with PLAYER.BMP for the asm example with no problem.

I wonder what"s wrong with my bitmap...

 

clouds.bmp

[Sporadic]

It might be due to your sprite width. 

It needs to be divisible by 8 bytes iirc (I've not validated what yours is, but it's one of the main gotchas)

[42bs]

11 hours ago, KanedaFr said:

R_sprite_gwidth

I guess gwidth is in phrases. So w/16 not w/2.

And  (w % 16) must be 0.

Edited September 27 by 42bs

[Sporadic]

/2 is correct in the context of rapinit.s with the object definitions. That's how you define the values for 4 bit graphics in Raptor/jagstudio

[KanedaFr]

1 hour ago, Sporadic said:

It might be due to your sprite width. 

It needs to be divisible by 8 bytes iirc (I've not validated what yours is, but it's one of the main gotchas)

ho...I didn't know about it...where is it documented so I could learn more and more ?

 

it could explain why it works with 8bpp (200/8 bytes = 25) but not 4bpp (200/2/8 bytes = 12,5) !

I'll try later today! thanks, it seems to be culprit

[Sporadic]

It might not be in the docs. But definitely needs adding!

 

I'll add to the list 🙂

[42bs]

20 minutes ago, KanedaFr said:

ho...I didn't know about it...where is it documented so I could learn more and more ?

 

it could explain why it works with 8bpp (200/8 bytes = 25) but not 4bpp (200/2/8 bytes = 12,5) !

I'll try later today! thanks, it seems to be culprit

It is about objects, I'd say. And those must be dividable by 8.

[KanedaFr]

Fixed !!!

Thanks a lot!

 

1 hour ago, Sporadic said:

It might not be in the docs. But definitely needs adding!

 

I'll add to the list 🙂

If you add it to the template's rapinit.s, it would be perfect / enough

 

PS: if you ever edit the doc, I'll me more than happy if you can fix Table A (sprite object properties)