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NeoLemmix Old Graphic Set Format
The
NeoLemmix graphic set format is very similar to the standard Lemmings
one, except with some unused bytes being repurposed. Thus, I recommend
first reading ccexplore's information on the standard Lemmings graphic sets. A graphic set consists of two files; a GROUNDxO.DAT file and a VGAGRx.DAT file.
The
VGAGRx.DAT file just contains two sections, which both contain planar
bitmaps - the first section has terrain bitmaps, the second has object
bitmaps. It does not contain any information about
those bitmaps; the metainfo is found in the GROUNDxO.DAT files. The
planar bitmaps are either 4-bit, 5-bit or 19-bit (the GROUNDxO.DAT file
contains information on which bit depth is used). In the case of 4-bit
or 5-bit images, they are palette based; the first 8 colors are
hardcoded while the remaining 8 or 24 are defined in the GROUNDxO.DAT
file. In the case of 19-bit images, they are RGB-based with 6 bits per
color, with the 19th (highest) bit being a transparency mask.
The
structure of the GROUNDxO.DAT file is as follows. Note that it only
contains room for 64 terrain pieces and 16 objects. A graphic set in
NeoLemmix (or even recent version of traditional Lemmix) can in fact
contain up to 128 terrains and 32 objects. In the case of a graphic set
with extra objects and/or terrains, the structure of the file is
repeated at the end (you could think of it as simply being two
GROUNDxO.DAT files in one; with the second one's palette entries being
ignored).
Note that all multi-byte values in the GROUNDxO.DAT file are in little-endian format.
Object Data
The
first part of the file is the object data. There are 16 slots. The
second slot is always assumed to be a window; all other objects are
assumed to not be a window (but can be anything else). An empty slot should be blanked out with 00s.
| Offset | Data | | 0x00 | Animation flags. This is a bitwise value:
Bit0 - If set, the animation must be triggered instead of being constantly animated
Bit1 - Should be set on windows, otherwise not set | | 0x01 | Unused (except on the first object, where it contains flags about the style as a whole - see later) | | 0x02 | Animation start frame index | | 0x03 | Number of animation frames | | 0x04 | Object width | | 0x05 | Object height | 0x06
0x07 | Number of bytes of data for each animation frame | 0x08
0x09 | Offset
of the mask from each frame's bitmap data. This is unused and should
not be assumed to be correct in graphic sets with 19-bit graphics. | 0x0A
0x0B | If extended location flag is set, then these are taken as the two high bytes of the object's graphic's base location | 0x0C
0x0D | Unused, leave it as 00
Note: 0x0D may be set in Cheapo graphic sets converted using LemSet. This value is unused by the NeoLemmix engine, but is used by CheapoCon. | 0x0E
0x0F | Trigger
area's X coordinate, note that the value in these bytes is multiplied
by 4 before it's used. EG: a value of 2 corresponds to a coordinate of
8 (2 * 4 = 8). | 0x10
0x11 | Trigger
area's Y coordinate, note that the value in these bytes is multiplied
by 4, then 4 is subtracted from it, before it's used. EG: a value of 2
corresponds to a coordinate of 4 (2 * 4 = 8; 8 - 4 = 4). | | 0x12 | Trigger
area's width, note that the value in this byte is multiplied by 4
before it's used. EG: a value of 2 corresponds to a width of 8 (2 * 4 =
8). | | 0x13 | Trigger area's height, note that the
value in this byte is multiplied by 4 before it's used. EG: a value of
2 corresponds to a height of 8 (2 * 4 = 8). | | 0x14 | Trigger area effect, see below for a list of effects. | 0x15
0x16 | Object graphic's base location in the VGAGR section | 0x17
0x18 | Object
graphic's preview image location in the VGAGR section (can, but does
not have to be, one of its usual animation frames); note that this is
overridden for some specific images | | 0x19 | Trigger
position/size offsets. This should be read as four two-bit values,
which are subtracted from the X, Y, width and height respectively
(starting from the value of the two highest bits). This is ignored if
Trigger Adjustments isn't turned on in the graphic sets options flags. | | 0x1A | Key frame number. Only some objects use this. | | 0x1B | Sound effect when triggered. Only some objects use this. |
Terrain Data
After the object data is the terrain data. There are 64 slots. An empty slot should be blanked out with 00s.
| Offset | Data | | 0x00 | Terrain piece width | | 0x01 | Terrain piece height | 0x02
0x03 | Terrain piece image location in the VGAGR section | 0x04
0x05 | Terrain
piece's mask location in the VGAGR section; this is ignored and should
not be assumed to be correct in graphic sets using 19-bit images. | | 0x06 | Bit7 is on if the piece is steel, otherwise is off. (Ignored if autosteel flag is off)
The remaining bits are taken as a 3rd (high) byte of the image's location if extended locations are on | | 0x07 | A 3rd (high) byte of the image mask's location |
Palette Data
The
final part of a GROUNDxO.DAT file is the palette. The first 24 bytes
are leftovers from standard lemmings which are the EGA palettes; these
are unused in NeoLemmix. The remainder are 24 entries of 3 bytes each;
these are 18-bit color values (the high two bits in each byte are
unused). Only the first 8 are used in graphic sets with 4-bit or 19-bit
images (all 24 are used in graphic sets with 5-bit images). The 19-bit
image graphic sets do not use these colors for their terrain pieces or
objects, but can use them for skill panel graphics and lemming
animations so they should still be set.
Graphic Sets Options Flags
The
byte at 0x01 in the first object's metadata has some flags about the
graphic set as a whole. These are read bitwise, as follows:
| Bit | Data | | Bit0 | If
this is on, the graphic set uses 5-bit graphics, otherwise it uses
4-bit graphics. (If the 19-bit graphics flag is set, then that
overrides this one.) | | Bit1 | This must be on to use the trigger set adjustments (byte 0x19 in each object data entry). | | Bit2 | This must be on to mark terrain pieces as steel (for use with autosteel). | | Bit3 | If this bit is on, the graphic set uses the Xmas Palette instead of the standard one for the 8 fixed colors. | | Bit4 | If this bit is on, LemSet will refuse to decompile the graphic set; NeoLemmix itself does not use it. | | Bit5 | This must be on to use the extra high bytes of image locations in the VGAGR files. | | Bit6 | If this is on, the graphic set uses 19-bit graphics (regardless of Bit0's setting). | | Bit7 | Unused; leave it off. |
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