78 lines
2.2 KiB
JavaScript
78 lines
2.2 KiB
JavaScript
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//
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// nscr.js
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//--------------------
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// Loads nscr files and provides a variety of functions for accessing and using the data.
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// Screen data for nitro 2d graphics. Each cell references a graphic (ncgr) and palette (nclr).
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// by RHY3756547
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//
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window.nscr = 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 != "RCSN") throw "NSCR invalid. Expected RCSN, found "+header.stamp;
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if (header.numSections != 1) throw "NSCR invalid. Too many sections - should have 1.";
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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.scrn = loadSCRN(view);
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}
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function loadSCRN(view) {
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var offset = t.sectionOffsets[0] - 8;
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var scrn = {};
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scrn.type = readChar(view, offset+0x0)+readChar(view, offset+0x1)+readChar(view, offset+0x2)+readChar(view, offset+0x3);
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if (scrn.type != "NRCS") throw "SCRN invalid. Expected NRCS, found "+scrn.type;
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scrn.blockSize = view.getUint32(offset+0x4, true);
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t.sectionOffsets[1] = t.sectionOffsets[0] + scrn.blockSize;
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scrn.screenWidth = view.getUint16(offset+0x8, true); //in pixels
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scrn.screenHeight = view.getUint16(offset+0xA, true);
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scrn.padding = view.getUint32(offset+0xC, true); //always 0
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scrn.screenDataSize = view.getUint32(offset+0x10, true);
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offset += 0x14;
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var entries = (scrn.blockSize - 0x14)/2;
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scrn.data = [];
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for (var i=0; i<entries; i++) {
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scrn.data.push(view.getUint16(offset, true));
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offset += 2;
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}
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return scrn;
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/*
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Format is (YYYYXXNNNNNNNNNN)
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Y4 Palette Number
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X2 Transformation (YFlip/XFlip)
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N10 Tile Number
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*/
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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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