142 lines
4.3 KiB
JavaScript
142 lines
4.3 KiB
JavaScript
//
|
|
// nsbta.js
|
|
//--------------------
|
|
// Reads NSBTA files (texture uv animation via uv transform matrices within a polygon) for use in combination with an NSBMD (model) file
|
|
// by RHY3756547
|
|
//
|
|
// includes: gl-matrix.js (glMatrix 2.0)
|
|
// /formats/nitro.js
|
|
//
|
|
|
|
// man oh man if only there were some documentation on this that weren't shoddily written code in mkds course modifier
|
|
// well i guess we can find out how the format works
|
|
// together :')
|
|
|
|
window.nsbta = function(input) {
|
|
|
|
var mainOff;
|
|
var animData;
|
|
var mainObj = this;
|
|
var prop = [
|
|
"scaleS",
|
|
"scaleT",
|
|
"rotation",
|
|
"translateS",
|
|
"translateT"
|
|
]
|
|
|
|
if (input != null) {
|
|
load(input);
|
|
}
|
|
this.load = load;
|
|
|
|
|
|
function load(input) {
|
|
var view = new DataView(input);
|
|
var header = null;
|
|
var offset = 0;
|
|
var tex;
|
|
|
|
//nitro 3d header
|
|
header = nitro.readHeader(view);
|
|
if (header.stamp != "BTA0") throw "NSBTA invalid. Expected BTA0, found "+header.stamp;
|
|
if (header.numSections > 1) throw "NSBTA invalid. Too many sections - should have 1 maximum.";
|
|
offset = header.sectionOffsets[0];
|
|
//end nitro
|
|
|
|
mainOff = offset;
|
|
|
|
var stamp = readChar(view, offset+0x0)+readChar(view, offset+0x1)+readChar(view, offset+0x2)+readChar(view, offset+0x3);
|
|
if (stamp != "SRT0") throw "NSBTA invalid. Expected SRT0, found "+stamp;
|
|
|
|
animData = nitro.read3dInfo(view, mainOff+8, animInfoHandler);
|
|
mainObj.animData = animData;
|
|
}
|
|
|
|
function animInfoHandler(view, offset) {
|
|
var animOff = view.getUint32(offset, true);
|
|
|
|
var off = mainOff+animOff;
|
|
var obj = readAnimData(view, off);
|
|
obj.nextoff = offset+4;
|
|
|
|
return obj;
|
|
}
|
|
|
|
function readAnimData(view, offset) {
|
|
var stamp = readChar(view, offset+0x0)+readChar(view, offset+0x1)+readChar(view, offset+0x2)+readChar(view, offset+0x3); //should be M_AT, where _ is a 0 character
|
|
var unknown1 = view.getUint16(offset+4, true);
|
|
var unknown2 = view.getUint8(offset+6, false);
|
|
var unknown3 = view.getUint8(offset+7, false);
|
|
var data = nitro.read3dInfo(view, offset+8, matInfoHandler);
|
|
return {data: data, nextoff: data.nextoff};
|
|
}
|
|
|
|
function matInfoHandler(view, offset, base) {
|
|
// there doesn't seem to be any documentation on this so I'm going to take the first step and maybe explain a few things here:
|
|
// each material has 5 sets of 16 bit values of the following type:
|
|
//
|
|
// frames: determines the number of frames worth of transforms of this type are stored
|
|
// flags: if >4096 then multiple frames are used instead of inline data. not much else is known
|
|
// offset/data: depending on previous flag, either points to an array of data or provides the data for the sole frame. relative to base of this 3dinfoobject
|
|
// data2: used for rotation matrix (second value)
|
|
//
|
|
// order is as follows:
|
|
// scaleS, scaleT, rotation, translateS, translateT (all values are signed fixed point 1.3.12)
|
|
//
|
|
// note: rotation external data has two 16 bit integers instead of one per frame.
|
|
//
|
|
// also!! rotation matrices work as follows:
|
|
//
|
|
// | B A |
|
|
// | -A B |
|
|
//
|
|
// kind of like nsbmd pivot
|
|
|
|
var obj = {}
|
|
obj.flags = []; //for debug
|
|
obj.frames = [];
|
|
obj.frameStep = {};
|
|
|
|
for (var i=0; i<5; i++) {
|
|
|
|
obj[prop[i]] = [];
|
|
var frames = view.getUint16(offset, true);
|
|
var flags = view.getUint16(offset+2, true);
|
|
var value = view.getUint16(offset+4, true);
|
|
var data2 = view.getInt16(offset+6, true)/4096;
|
|
|
|
//flags research so far:
|
|
//bit 13 (8196) - set if inline single frame data, unset if multiple frame data at offset
|
|
//bit 14-15 - framestep, aka what to shift frame counters by (eg for half framerate this would be 1, frame>>1, essentially dividing the frame speed by 2.)
|
|
|
|
obj.frameStep[prop[i]] = (flags>>14);
|
|
obj.flags[i] = flags;
|
|
obj.frames[i] = frames;
|
|
|
|
if (flags & 8192) {
|
|
if (value & 32768) value = 65536-value; //convert to int
|
|
obj[prop[i]].push(value/4096);
|
|
if (i == 2) obj[prop[i]].push(data2);
|
|
} else { //data is found at offset
|
|
frames = frames>>obj.frameStep[prop[i]];
|
|
//frames -= 1;
|
|
var off = base + value-8;
|
|
for (var j=0; j<frames*((i==2)?2:1); j++) {
|
|
var prevvalue = view.getInt16(off-2, true)/4096;
|
|
//debugger;
|
|
obj[prop[i]].push(view.getInt16(off, true)/4096);
|
|
off += 2;
|
|
}
|
|
}
|
|
|
|
offset += 8;
|
|
}
|
|
obj.nextoff = offset;
|
|
return obj;
|
|
}
|
|
|
|
function readChar(view, offset) {
|
|
return String.fromCharCode(view.getUint8(offset));
|
|
}
|
|
} |