FF8/FileFormat magfiles

From Final Fantasy Inside
< FF8
Revision as of 12:46, 12 December 2016 by my_wiki>MaKiPL
Jump to navigation Jump to search

By MaKiPL


There is no unified format for MAG files. Every file has their own naming, even extension. You can't really distinguish them.

Files starting with 10 00 00 00 09 00 00 00 are obviously TIM texture. Files starting with null 4 bytes are in most cases "Packed magic file"

Packed magic file

Offset Description
0x00 Probably always null
0x04 Probably bones/animation data
0x08 Unknown (used to determinate texture size*)
0x0C Geometry pointer
0x10 SCOT pointer
0x14 Texture pointer


G.F. Sequence

http://forums.qhimm.com/index.php?topic=15056.0

Environment objects

I'm aware it's chaotic, like no tables and etc. but it's up-to-date information First, recognize file:

1.Header must be 8 bytes null!! EDIT: Usually, but there are meshes without 8 bytes null header. Don't be afraid to test them.

2.Jump to pointer at 0xC [Global]

3.This int indicates pointer count. Example: 10 00 00 00 is 16 pointers

3a. If pointer is 00 00 00 00, just ignore it and move forward

4.After noting all pointers that are not 00 00 00 00 (therefore inspecting Count*4 bytes) just jump to selected one [Relative jump from count int]

5.See third int (8th byte) for UNKNOWN(POLYGON TYPES see below) [Relative jump from 03 00 00 00]

6.Read int at 20th byte for VERTICES offset [Relative jump from 03 00 00 00]

7.Read int at 24th byte for VERTICES COUNT [Vertex is 8 bytes! X Z Y W, where W is probably weight byte [as in OBJ specification] and is normally unused (as usual, even in casual OBJ files)]

Example: 09 00 9f 01 means there's 9f 01 (415) polygons of type 0x9. Therefore: 28*415=11620 bytes to next polygon type or vertices if FF FF FF FF.

Magic.fs and Battle.fs MAG environment GF objects

GF Environment (stages like Cerberus gate; Alexander backdrop and etc.) geometry contains many polygon types (sic!). Every single polygon type is different than other.

       private int[] _knownPolygons = new int[] 
       {
           0x2,
           0x6,
           0x7,
           0x8,
           0x9,
           0xC,
           0x10,
           0x12,
           0x11,
           0x13,
       };


0xC points to geometry section. If *0xC (pointers to geometries) is == 0, then file has no geometry (it is possible. Some files are only texture, some only geometry, some are only animation and some are everything). There should be no single case where the number of models in file exceed 12.

0xC:
 PointersToModel:
    Example object (let's call it modOffset)
uint _objCount = *modOffset;
ushort _vertexCount = *(modOffset + 24);
ushort _verticesOffset = *(modOffset + 20);

Polygon parsing based on types (C#):

int relativeJump = *(modOffset + 8);
int *localoffset = modOffset + _relativeJump + 4;
               if (polygonType == 0x02)
               {
                   for (int i = 0; i < polygons * 20; i += 20)
                   {
                       f += $"f {GetPolygon(localoffset + i + 0xC)} {GetPolygon(localoffset + i + 0xE)} {GetPolygon(localoffset + i + 0x10)}\n";
                   }
                   safeHandle = polygons * 20;
               }
               if (polygonType == 0x06)
               {
                   for (int i = 0; i < polygons * 12; i += 12)
                   {
                       f += $"f {GetPolygon(localoffset + i + 0x4)} {GetPolygon(localoffset + i + 0x6)} {GetPolygon(localoffset + i + 0x08)}\n";
                   }
                   safeHandle = polygons * 12;
               }
               if (polygonType == 0x07)
               {
                   for (int i = 0; i < polygons * 20; i += 20)
                   {
                       f += $"f {GetPolygon(localoffset + i + 0xC)} {GetPolygon(localoffset + i + 0xE)} {GetPolygon(localoffset + i + 0x10)}\n";
                   }
                   safeHandle = polygons * 20;
               }
               if (polygonType == 0x09)
               {
                   for (int i = 0; i < polygons * 28; i += 28)
                   {
                       f += $"f {GetPolygon(localoffset + i + 18)} {GetPolygon(localoffset + i + 20)} {GetPolygon(localoffset + i + 22)}\n";
                   }
                   safeHandle = polygons * 28;
               }
               if (polygonType == 0x08)
               {
                   for (int i = 0; i < polygons * 20; i += 20)
                   {
                       f += $"f {GetPolygon(localoffset + i + 0xA)} {GetPolygon(localoffset + i + 0xC)} {GetPolygon(localoffset + i + 0xE)}\n";
                   }
                   safeHandle = polygons * 20;
               }
               if (polygonType == 12)
               {
                   for (int i = 0; i < polygons * 28; i += 28)
                   {
                       f += $"f {GetPolygon(localoffset + i + 20)} {GetPolygon(localoffset + i + 22)} {GetPolygon(localoffset + i + 26)} {GetPolygon(localoffset + i + 24)}\n";
                   }
                   safeHandle = polygons * 28;
               }
               if (polygonType == 0x12)
               {
                   for (int i = 0; i < polygons * 24; i += 24)
                   {
                       f += $"f {GetPolygon(localoffset + i + 12)} {GetPolygon(localoffset + i + 14)} {GetPolygon(localoffset + i + 18)} {GetPolygon(localoffset + i + 16)}\n";
                   }
                   safeHandle = polygons * 24;
               }
               if (polygonType == 0x13)
               {
                   for (int i = 0; i < polygons * 36; i += 36)
                   {
                       f += $"f {GetPolygon(localoffset + i + 24)} {GetPolygon(localoffset + i + 26)} {GetPolygon(localoffset + i + 30)} {GetPolygon(localoffset + i + 28)}\n";
                   }
                   safeHandle = polygons * 36;
               }
               if (polygonType == 0x11)
               {
                   for (int i = 0; i < polygons * 24; i += 24)
                   {
                       f += $"f {GetPolygon(localoffset + i + 16)} {GetPolygon(localoffset + i + 18)} {GetPolygon(localoffset + i + 22)} {GetPolygon(localoffset + i + 20)}\n";
                   }
                   safeHandle = polygons * 24;
               }
               if (polygonType == 0x10)
               {
                   for (int i = 0; i < polygons * 12; i += 12)
                   {
                       f += $"f {GetPolygon(localoffset + i + 4)} {GetPolygon(localoffset + i + 6)} {GetPolygon(localoffset + i + 10)} {GetPolygon(localoffset + i + 8)}\n";
                   }
                   safeHandle = polygons * 12;
               }
               uint isNext = *(localoffset + safeHandle);
               if (isNext == 0xFFFFFFFF) //FFFFFFFF breaks the polygons reading
                   break;

Vertex:

short x
short z
short y
short w //rarely used, for skeleton weighting

Textures

1. See 0x08, it points almost always to null data, but also indicates where to stop watching texture pointers

2. Jump to pointer 0x14 (almost always 0x30)

3. Note all pointers if not zero until streamPosition==*(0x08)

4. If no pointers, file has no texture.

5. Jump to texture (pointer+*(0x14)) e.g. 48+21675

6. There's no sizes, so if there's another texture after the one you're getting, then subdivide next texture position from current position to get size and determine texture resolution. If it's the last texture, then it gets a bit tricky, as in many ways the file is not ending with texture but SCOT for example..