102 lines
3.1 KiB
JavaScript
102 lines
3.1 KiB
JavaScript
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//
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// nclr.js
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//--------------------
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// Loads nclr files and provides a variety of functions for accessing and using the data.
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// Palette information for nitro 2d graphics.
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// by RHY3756547
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//
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window.nclr = 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 != "RLCN") throw "NCLR invalid. Expected RLCN, found "+header.stamp;
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if (header.numSections < 1 || header.numSections > 2) throw "NCLR 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.pltt = loadPLTT(view);
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if (header.numSections > 1) t.pcmp = loadPCMP(view);
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}
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function loadPLTT(view) {
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var offset = t.sectionOffsets[0] - 8;
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var pltt = {};
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pltt.type = readChar(view, offset+0x0)+readChar(view, offset+0x1)+readChar(view, offset+0x2)+readChar(view, offset+0x3);
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if (pltt.type != "TTLP") throw "NCLR invalid. Expected TTLP, found "+pltt.type;
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pltt.blockSize = view.getUint32(offset+0x4, true);
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t.sectionOffsets[1] = t.sectionOffsets[0] + pltt.blockSize;
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pltt.bitDepth = view.getUint32(offset+0x8, true); //3 -> 4bit, 4 -> 8bit
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pltt.padding = view.getUint32(offset+0xC, true);
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pltt.palEntries = view.getUint32(offset+0x10, true) / 2; //stored in bytes, 2 bytes per col. seems to be wrong sometimes? (8bit mode, padding as 1)
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pltt.colorsPerPal = view.getUint32(offset+0x14, true); //usually 16
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//16-bit pallete data
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//XBBBBBGGGGGRRRRR
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var colsPerPal = (pltt.bitDepth == 4)?256:16;
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var realPalCount = (pltt.blockSize - 0x18) / 2;
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offset += 0x18;
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pltt.palettes = [];
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var curPal = [];
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for (var i=0; i<realPalCount; i++) {
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curPal.push(readPalColour(view, offset));
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if (curPal.length >= colsPerPal) {
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pltt.palettes.push(curPal);
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curPal = [];
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}
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offset += 2;
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}
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if (curPal.length > 0) pltt.palettes.push(curPal);
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return pltt;
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}
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function loadPCMP(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 pcmp = {};
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pcmp.type = readChar(view, offset+0x0)+readChar(view, offset+0x1)+readChar(view, offset+0x2)+readChar(view, offset+0x3);
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if (pcmp.type != "PMCP") throw "NCLR invalid. Expected PMCP, found "+stamp;
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pcmp.blockSize = view.getUint32(offset+0x4, true);
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pcmp.palCount = view.getUint16(offset+0x8, true);
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//unknown 16: 0?
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pcmp.unknown = view.getUint32(offset+0xC, true);
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offset += 0x10;
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var palIDs = [];
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for (var i=0; i<pcmp.palCount; i++) {
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palIDs.push(view.getUint16(offset, true));
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offset += 2;
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}
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return pcmp;
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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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