100 lines
3.2 KiB
JavaScript
100 lines
3.2 KiB
JavaScript
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//
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// ncgr.js
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//--------------------
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// Loads ncgr files and provides a variety of functions for accessing and using the data.
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// "Graphics Resource", as in tile data. Usually rendered in conjunction with Palette (nclr) and Cell (ncer) / screen (nscr) data.
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// by RHY3756547
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//
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window.ncgr = function(input) {
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var mainOff;
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var t = this;
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if (input != null) {
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load(input);
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}
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this.load = load;
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function load(input) {
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var view = new DataView(input);
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var header = null;
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var offset = 0;
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var tex;
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//nitro 3d header
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header = nitro.readHeader(view);
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if (header.stamp != "RGCN") throw "NCGR invalid. Expected RGCN, found "+header.stamp;
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if (header.numSections < 1 || header.numSections > 2) throw "NCGR invalid. Too many sections - should have 2.";
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offset = header.sectionOffsets[0];
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//end nitro
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t.sectionOffsets = header.sectionOffsets;
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t.sectionOffsets[0] = 0x18;
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mainOff = offset;
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t.char = loadCHAR(view);
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if (header.numSections > 1) t.cpos = loadCPOS(view);
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}
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function loadCHAR(view) {
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var offset = t.sectionOffsets[0] - 8;
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var char = {};
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char.type = readChar(view, offset+0x0)+readChar(view, offset+0x1)+readChar(view, offset+0x2)+readChar(view, offset+0x3);
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if (char.type != "RAHC") throw "NCGR invalid. Expected RAHC, found "+char.type;
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char.blockSize = view.getUint32(offset+0x4, true);
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t.sectionOffsets[1] = t.sectionOffsets[0] + char.blockSize;
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char.tilesY = view.getUint16(offset+0x8, true); //(tiles y)
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char.tilesX = view.getUint16(offset+0xA, true); //(tiles x)
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char.bitDepth = view.getUint32(offset+0xC, true); //3 - 4bits, 4 - 8bits
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//pad 0x10
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char.tiledFlag = view.getUint32(offset+0x14, true);
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char.tileDataSize = view.getUint32(offset+0x18, true);
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char.unknown = view.getUint32(offset+0x1C, true); //usually 24
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offset += 0x20;
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//tiles are 8 or 4 bit index to pal data
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//64 pixels per tile (8*8)
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var tileCount = (char.blockSize-0x20) / ((char.bitDepth == 4) ? 64 : 32);
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char.tiles = [];
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for (var i=0; i<tileCount; i++) {
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var tile = [];
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if (char.bitDepth == 4) {
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//easy, just read 1024 bytes
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for (var j=0; j<64; j++) tile.push(view.getUint8(offset++));
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} else {
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for (var j=0; j<32; j++) {
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var dat = view.getUint8(offset++);
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tile.push(dat&0xF);
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tile.push(dat>>4);
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}
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}
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char.tiles.push(tile);
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}
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return char;
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}
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function loadCPOS(view) { //palette count map, supposedly. maps each palette to an ID
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var offset = t.sectionOffsets[1] - 8;
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var cpos = {};
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cpos.type = readChar(view, offset+0x0)+readChar(view, offset+0x1)+readChar(view, offset+0x2)+readChar(view, offset+0x3);
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if (cpos.type != "SOPC") throw "NCLR invalid. Expected SOPC, found "+stamp;
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cpos.blockSize = view.getUint32(offset+0x4, true);
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//padding 0x8
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cpos.tileSize = view.getUint16(offset+0xC, true); //always 32
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cpos.tileCount = view.getUint16(offset+0xE, true);
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return cpos;
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}
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function readPalColour(view, ind) {
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var col = view.getUint16(ind, true);
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var f = 255/31;
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return [Math.round((col&31)*f), Math.round(((col>>5)&31)*f), Math.round(((col>>10)&31)*f), 255];
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}
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function readChar(view, offset) {
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return String.fromCharCode(view.getUint8(offset));
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}
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}
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