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added tms9918a
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Steven Hugg
parent
ca0c7cf045
commit
30ac9a3509
656
src/video/tms9918a.ts
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656
src/video/tms9918a.ts
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@ -0,0 +1,656 @@
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/*
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* js99'er - TI-99/4A emulator written in JavaScript
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*
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* Created 2014 by Rasmus Moustgaard <rasmus.moustgaard@gmail.com>
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*
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* TMS9918A VDP emulation.
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*
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* https://github.com/Rasmus-M/Js99er
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* GNU General Public License v2.0
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*/
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'use strict';
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enum TMS9918A_Mode {
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GRAPHICS = 0,
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TEXT = 1,
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BITMAP = 2,
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MULTICOLOR = 3,
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BITMAP_TEXT = 4,
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BITMAP_MULTICOLOR = 5,
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ILLEGAL = 6,
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};
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/**
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* @constructor
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*/
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export function TMS9918A(canvas, cru, enableFlicker) {
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this.canvas = canvas;
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this.cru = cru;
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this.enableFlicker = enableFlicker;
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this.ram = new Uint8Array(16384); // VDP RAM
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this.registers = new Uint8Array(8);
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this.addressRegister = null;
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this.statusRegister = null;
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this.palette = [
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[0, 0, 0],
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[0, 0, 0],
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[33, 200, 66],
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[94, 220, 120],
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[84, 85, 237],
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[125, 118, 252],
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[212, 82, 77],
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[66, 235, 245],
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[252, 85, 84],
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[255, 121, 120],
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[212, 193, 84],
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[230, 206, 128],
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[33, 176, 59],
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[201, 91, 186],
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[204, 204, 204],
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[255, 255, 255]
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];
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this.latch = null;
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this.prefetchByte = null;
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this.displayOn = null;
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this.interruptsOn = null;
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this.screenMode = null;
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this.bitmapMode = null;
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this.textMode = null;
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this.colorTable = null;
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this.nameTable = null;
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this.charPatternTable = null;
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this.spriteAttributeTable = null;
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this.spritePatternTable = null;
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this.colorTableMask = null;
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this.patternTableMask = null;
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this.ramMask = null;
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this.fgColor = null;
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this.bgColor = null;
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this.flicker = null;
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this.redrawRequired = null;
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this.canvasContext = this.canvas.getContext("2d");
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this.imageData = null;
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this.width = null;
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this.height = null;
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//this.log = Log.getLog();
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this.reset();
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}
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TMS9918A.prototype = {
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reset: function () {
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var i;
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for (i = 0; i < this.ram.length; i++) {
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this.ram[i] = 0;
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}
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for (i = 0; i < this.registers.length; i++) {
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this.registers[i] = 0;
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}
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this.addressRegister = 0;
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this.statusRegister = 0;
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this.prefetchByte = 0;
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this.latch = false;
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this.displayOn = false;
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this.interruptsOn = false;
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this.screenMode = TMS9918A_Mode.GRAPHICS;
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this.bitmapMode = false;
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this.textMode = false;
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this.colorTable = 0;
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this.nameTable = 0;
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this.charPatternTable = 0;
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this.spriteAttributeTable = 0;
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this.spritePatternTable = 0;
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this.colorTableMask = 0x3FFF;
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this.patternTableMask = 0x3FFF;
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this.ramMask = 0x3FFF;
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this.fgColor = 0;
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this.bgColor = 0;
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this.flicker = this.enableFlicker;
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this.redrawRequired = true;
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this.canvas.width = 304;
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this.canvas.height = 240;
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this.canvasContext.fillStyle = 'rgba(' + this.palette[7].join(',') + ',1.0)';
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this.canvasContext.fillRect(0, 0, this.canvas.width, this.canvas.height);
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// Build the array containing the canvas bitmap (256 * 192 * 4 bytes (r,g,b,a) format each pixel)
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this.imageData = this.canvasContext.getImageData(0, 0, this.canvas.width, this.canvas.height);
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this.width = this.canvas.width;
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this.height = this.canvas.height;
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},
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drawFrame: function (timestamp) {
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if (this.redrawRequired) {
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for (var y = 0; y < this.height; y++) {
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this.drawScanline(y);
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}
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this.updateCanvas();
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this.redrawRequired = false;
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}
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},
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initFrame: function (timestamp) {
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},
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drawScanline: function (y) {
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var imageData = this.imageData.data,
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width = this.width,
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imageDataAddr = (y * width) << 2,
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screenMode = this.screenMode,
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textMode = this.textMode,
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bitmapMode = this.bitmapMode,
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drawWidth = !textMode ? 256 : 240,
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drawHeight = 192,
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hBorder = (width - drawWidth) >> 1,
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vBorder = (this.height - drawHeight) >> 1,
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fgColor = this.fgColor,
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bgColor = this.bgColor,
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ram = this.ram,
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nameTable = this.nameTable,
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colorTable = this.colorTable,
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charPatternTable = this.charPatternTable,
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colorTableMask = this.colorTableMask,
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patternTableMask = this.patternTableMask,
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spriteAttributeTable = this.spriteAttributeTable,
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spritePatternTable = this.spritePatternTable,
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spriteSize = (this.registers[1] & 0x2) !== 0,
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spriteMagnify = this.registers[1] & 0x1,
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spriteDimension = (spriteSize ? 16 : 8) << (spriteMagnify ? 1 : 0),
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maxSpritesOnLine = this.flicker ? 4 : 32,
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palette = this.palette,
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collision = false, fifthSprite = false, fifthSpriteIndex = 31,
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x, color, rgbColor, name, tableOffset, colorByte, patternByte;
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if (y >= vBorder && y < vBorder + drawHeight && this.displayOn) {
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var y1 = y - vBorder;
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// Pre-process sprites
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if (!textMode) {
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var spriteBuffer = new Uint8Array(drawWidth);
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var spritesOnLine = 0;
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var endMarkerFound = false;
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var spriteAttributeAddr = spriteAttributeTable;
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var s;
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for (s = 0; s < 32 && spritesOnLine <= maxSpritesOnLine && !endMarkerFound; s++) {
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var sy = ram[spriteAttributeAddr];
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if (sy !== 0xD0) {
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if (sy > 0xD0) {
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sy -= 256;
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}
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sy++;
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var sy1 = sy + spriteDimension;
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var y2 = -1;
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if (s < 8 || !bitmapMode) {
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if (y1 >= sy && y1 < sy1) {
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y2 = y1;
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}
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}
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else {
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// Emulate sprite duplication bug
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var yMasked = y1 & (((this.registers[4] & 0x03) << 6) | 0x3F);
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if (yMasked >= sy && yMasked < sy1) {
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y2 = yMasked;
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}
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else if (y1 >= 64 && y1 < 128 && y1 >= sy && y1 < sy1) {
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y2 = y1;
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}
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}
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if (y2 !== -1) {
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if (spritesOnLine < maxSpritesOnLine) {
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var sx = ram[spriteAttributeAddr + 1];
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var sPatternNo = ram[spriteAttributeAddr + 2] & (spriteSize ? 0xFC : 0xFF);
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var sColor = ram[spriteAttributeAddr + 3] & 0x0F;
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if ((ram[spriteAttributeAddr + 3] & 0x80) !== 0) {
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sx -= 32;
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}
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var sLine = (y2 - sy) >> spriteMagnify;
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var sPatternBase = spritePatternTable + (sPatternNo << 3) + sLine;
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for (var sx1 = 0; sx1 < spriteDimension; sx1++) {
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var sx2 = sx + sx1;
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if (sx2 >= 0 && sx2 < drawWidth) {
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var sx3 = sx1 >> spriteMagnify;
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var sPatternByte = ram[sPatternBase + (sx3 >= 8 ? 16 : 0)];
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if ((sPatternByte & (0x80 >> (sx3 & 0x07))) !== 0) {
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if (spriteBuffer[sx2] === 0) {
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spriteBuffer[sx2] = sColor + 1;
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}
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else {
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collision = true;
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}
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}
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}
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}
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}
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spritesOnLine++;
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}
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spriteAttributeAddr += 4;
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}
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else {
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endMarkerFound = true;
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}
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}
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if (spritesOnLine > 4) {
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fifthSprite = true;
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fifthSpriteIndex = s;
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}
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}
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// Draw
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var rowOffset = !textMode ? (y1 >> 3) << 5 : (y1 >> 3) * 40;
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var lineOffset = y1 & 7;
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for (x = 0; x < width; x++) {
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if (x >= hBorder && x < hBorder + drawWidth) {
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var x1 = x - hBorder;
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// Tiles
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switch (screenMode) {
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case TMS9918A_Mode.GRAPHICS:
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name = ram[nameTable + rowOffset + (x1 >> 3)];
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colorByte = ram[colorTable + (name >> 3)];
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patternByte = ram[charPatternTable + (name << 3) + lineOffset];
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color = (patternByte & (0x80 >> (x1 & 7))) !== 0 ? (colorByte & 0xF0) >> 4 : colorByte & 0x0F;
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break;
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case TMS9918A_Mode.BITMAP:
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name = ram[nameTable + rowOffset + (x1 >> 3)];
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tableOffset = ((y1 & 0xC0) << 5) + (name << 3);
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colorByte = ram[colorTable + (tableOffset & colorTableMask) + lineOffset];
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patternByte = ram[charPatternTable + (tableOffset & patternTableMask) + lineOffset];
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color = (patternByte & (0x80 >> (x1 & 7))) !== 0 ? (colorByte & 0xF0) >> 4 : colorByte & 0x0F;
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break;
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case TMS9918A_Mode.MULTICOLOR:
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name = ram[nameTable + rowOffset + (x1 >> 3)];
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lineOffset = (y1 & 0x1C) >> 2;
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patternByte = ram[charPatternTable + (name << 3) + lineOffset];
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color = (x1 & 4) === 0 ? (patternByte & 0xF0) >> 4 : patternByte & 0x0F;
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break;
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case TMS9918A_Mode.TEXT:
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name = ram[nameTable + rowOffset + Math.floor(x1 / 6)];
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patternByte = ram[charPatternTable + (name << 3) + lineOffset];
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color = (patternByte & (0x80 >> (x1 % 6))) !== 0 ? fgColor : bgColor;
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break;
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case TMS9918A_Mode.BITMAP_TEXT:
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name = ram[nameTable + rowOffset + Math.floor(x1 / 6)];
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tableOffset = ((y1 & 0xC0) << 5) + (name << 3);
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patternByte = ram[charPatternTable + (tableOffset & patternTableMask) + lineOffset];
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color = (patternByte & (0x80 >> (x1 % 6))) !== 0 ? fgColor : bgColor;
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break;
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case TMS9918A_Mode.BITMAP_MULTICOLOR:
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name = ram[nameTable + rowOffset + (x1 >> 3)];
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lineOffset = (y1 & 0x1C) >> 2;
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tableOffset = ((y1 & 0xC0) << 5) + (name << 3);
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patternByte = ram[charPatternTable + (tableOffset & patternTableMask) + lineOffset];
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color = (x1 & 4) === 0 ? (patternByte & 0xF0) >> 4 : patternByte & 0x0F;
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break;
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case TMS9918A_Mode.ILLEGAL:
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color = (x1 & 4) === 0 ? fgColor : bgColor;
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break;
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}
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if (color === 0) {
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color = bgColor;
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}
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// Sprites
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if (!textMode) {
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var spriteColor = spriteBuffer[x1] - 1;
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if (spriteColor > 0) {
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color = spriteColor;
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}
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}
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}
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else {
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color = bgColor;
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}
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rgbColor = palette[color];
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imageData[imageDataAddr++] = rgbColor[0]; // R
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imageData[imageDataAddr++] = rgbColor[1]; // G
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imageData[imageDataAddr++] = rgbColor[2]; // B
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imageDataAddr++; // Skip alpha
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}
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}
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// Top/bottom border
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else {
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rgbColor = palette[bgColor];
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for (x = 0; x < width; x++) {
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imageData[imageDataAddr++] = rgbColor[0]; // R
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imageData[imageDataAddr++] = rgbColor[1]; // G
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imageData[imageDataAddr++] = rgbColor[2]; // B
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imageDataAddr++; // Skip alpha
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}
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}
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if (y === vBorder + drawHeight) {
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this.statusRegister |= 0x80;
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if (this.interruptsOn) {
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this.cru.setVDPInterrupt(true);
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}
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}
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if (collision) {
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this.statusRegister |= 0x20;
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}
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if ((this.statusRegister & 0x40) === 0) {
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this.statusRegister |= fifthSpriteIndex;
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}
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if (fifthSprite) {
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this.statusRegister |= 0x40;
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}
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},
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updateCanvas: function () {
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this.canvasContext.putImageData(this.imageData, 0, 0);
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},
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writeAddress: function (i) {
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if (!this.latch) {
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this.addressRegister = (this.addressRegister & 0xFF00) | i;
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}
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else {
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switch ((i & 0xc0) >> 6) {
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// Set read address
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case 0:
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this.addressRegister = ((i & 0x3f) << 8) | (this.addressRegister & 0x00FF);
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this.prefetchByte = this.ram[this.addressRegister++];
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this.addressRegister &= 0x3FFF;
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break;
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// Set write address
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case 1:
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this.addressRegister = ((i & 0x3f) << 8) | (this.addressRegister & 0x00FF);
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break;
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// Write register
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case 2:
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case 3:
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this.registers[i & 0x7] = this.addressRegister & 0x00FF;
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switch (i & 0x7) {
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// Mode
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case 0:
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this.updateMode(this.registers[0], this.registers[1]);
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break;
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case 1:
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this.ramMask = (this.registers[1] & 0x80) !== 0 ? 0x3FFF : 0x1FFF;
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this.displayOn = (this.registers[1] & 0x40) !== 0;
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this.interruptsOn = (this.registers[1] & 0x20) !== 0;
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this.updateMode(this.registers[0], this.registers[1]);
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break;
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// Name table
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case 2:
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this.nameTable = (this.registers[2] & 0xf) << 10;
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break;
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// Color table
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case 3:
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if (this.bitmapMode) {
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this.colorTable = (this.registers[3] & 0x80) << 6;
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}
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else {
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this.colorTable = this.registers[3] << 6;
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}
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this.updateTableMasks();
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break;
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// Pattern table
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case 4:
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if (this.bitmapMode) {
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this.charPatternTable = (this.registers[4] & 0x4) << 11;
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}
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else {
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this.charPatternTable = (this.registers[4] & 0x7) << 11;
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}
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this.updateTableMasks();
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break;
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// Sprite attribute table
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case 5:
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this.spriteAttributeTable = (this.registers[5] & 0x7f) << 7;
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break;
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// Sprite pattern table
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case 6:
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this.spritePatternTable = (this.registers[6] & 0x7) << 11;
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break;
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// Background
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case 7:
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this.fgColor = (this.registers[7] & 0xf0) >> 4;
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this.bgColor = this.registers[7] & 0x0f;
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break;
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}
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// this.logRegisters();
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// this.log.info("Name table: " + this.nameTable.toHexWord());
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// this.log.info("Pattern table: " + this.charPatternTable.toHexWord());
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break;
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}
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this.redrawRequired = true;
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}
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this.latch = !this.latch;
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},
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updateMode: function (reg0, reg1) {
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this.bitmapMode = (reg0 & 0x02) !== 0;
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this.textMode = (reg1 & 0x10) !== 0;
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// Check bitmap mode bit, not text or multicolor
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if (this.bitmapMode) {
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switch ((reg1 & 0x18) >> 3) {
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case 0:
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// Bitmap mode
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this.screenMode = TMS9918A_Mode.BITMAP;
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break;
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case 1:
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// Multicolor mode
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this.screenMode = TMS9918A_Mode.BITMAP_MULTICOLOR;
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break;
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case 2:
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// Text mode
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this.screenMode = TMS9918A_Mode.BITMAP_TEXT;
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break;
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case 3:
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// Illegal
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this.screenMode = TMS9918A_Mode.ILLEGAL;
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break;
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}
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} else {
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switch ((reg1 & 0x18) >> 3) {
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case 0:
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// Graphics mode 0
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this.screenMode = TMS9918A_Mode.GRAPHICS;
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break;
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case 1:
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// Multicolor mode
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this.screenMode = TMS9918A_Mode.MULTICOLOR;
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||||
break;
|
||||
case 2:
|
||||
// Text mode
|
||||
this.screenMode = TMS9918A_Mode.TEXT;
|
||||
break;
|
||||
case 3:
|
||||
// Illegal
|
||||
this.screenMode = TMS9918A_Mode.ILLEGAL;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (this.bitmapMode) {
|
||||
this.colorTable = (this.registers[3] & 0x80) << 6;
|
||||
this.charPatternTable = (this.registers[4] & 0x4) << 11;
|
||||
this.updateTableMasks();
|
||||
} else {
|
||||
this.colorTable = this.registers[3] << 6;
|
||||
this.charPatternTable = (this.registers[4] & 0x7) << 11;
|
||||
}
|
||||
this.nameTable = (this.registers[2] & 0xf) << 10;
|
||||
this.spriteAttributeTable = (this.registers[5] & 0x7f) << 7;
|
||||
this.spritePatternTable = (this.registers[6] & 0x7) << 11;
|
||||
},
|
||||
|
||||
updateTableMasks: function () {
|
||||
if (this.screenMode === TMS9918A_Mode.BITMAP) {
|
||||
this.colorTableMask = ((this.registers[3] & 0x7F) << 6) | 0x3F; // 000CCCCCCC111111
|
||||
this.patternTableMask = ((this.registers[4] & 0x03) << 11) | (this.colorTableMask & 0x7FF); // 000PPCCCCC111111
|
||||
// this.log.info("colorTableMask:" + this.colorTableMask);
|
||||
// this.log.info("patternTableMask:" + this.patternTableMask);
|
||||
}
|
||||
else if (this.screenMode === TMS9918A_Mode.BITMAP_TEXT || this.screenMode === TMS9918A_Mode.BITMAP_MULTICOLOR) {
|
||||
this.colorTableMask = this.ramMask;
|
||||
this.patternTableMask = ((this.registers[4] & 0x03) << 11) | 0x7FF; // 000PP11111111111
|
||||
}
|
||||
else {
|
||||
this.colorTableMask = this.ramMask;
|
||||
this.patternTableMask = this.ramMask;
|
||||
}
|
||||
},
|
||||
|
||||
writeData: function (i) {
|
||||
this.ram[this.addressRegister++] = i;
|
||||
this.addressRegister &= this.ramMask;
|
||||
this.redrawRequired = true;
|
||||
},
|
||||
|
||||
readStatus: function () {
|
||||
var i = this.statusRegister;
|
||||
this.statusRegister = 0x1F;
|
||||
if (this.interruptsOn) {
|
||||
this.cru.setVDPInterrupt(false);
|
||||
}
|
||||
this.latch = false;
|
||||
return i;
|
||||
},
|
||||
|
||||
readData: function () {
|
||||
var i = this.prefetchByte;
|
||||
this.prefetchByte = this.ram[this.addressRegister++];
|
||||
this.addressRegister &= this.ramMask;
|
||||
return i;
|
||||
},
|
||||
|
||||
getRAM: function () {
|
||||
return this.ram;
|
||||
},
|
||||
|
||||
colorTableSize: function () {
|
||||
if (this.screenMode === TMS9918A_Mode.GRAPHICS) {
|
||||
return 0x20;
|
||||
}
|
||||
else if (this.screenMode === TMS9918A_Mode.BITMAP) {
|
||||
return Math.min(this.colorTableMask + 1, 0x1800);
|
||||
}
|
||||
else {
|
||||
return 0;
|
||||
}
|
||||
},
|
||||
|
||||
patternTableSize: function () {
|
||||
if (this.bitmapMode) {
|
||||
return Math.min(this.patternTableMask + 1, 0x1800);
|
||||
}
|
||||
else {
|
||||
return 0x800;
|
||||
}
|
||||
},
|
||||
|
||||
getRegsString: function () {
|
||||
var s = "";
|
||||
for (var i = 0; i < this.registers.length; i++) {
|
||||
s += "VR" + i + ":" + this.registers[i].toHexByte() + " ";
|
||||
}
|
||||
s += "\nSIT:" + this.nameTable.toHexWord() + " PDT:" + this.charPatternTable.toHexWord() + " (" + this.patternTableSize().toHexWord() + ")" +
|
||||
" CT:" + this.colorTable.toHexWord() + " (" + this.colorTableSize().toHexWord() + ") SDT:" + this.spritePatternTable.toHexWord() +
|
||||
" SAL:" + this.spriteAttributeTable.toHexWord() + "\nVDP: " + this.addressRegister.toHexWord();
|
||||
return s;
|
||||
},
|
||||
|
||||
hexView: function (start, length, anchorAddr) {
|
||||
var text = "";
|
||||
var anchorLine = null;
|
||||
var addr = start;
|
||||
var line = 0;
|
||||
for (var i = 0; i < length && addr < 0x4000; addr++, i++) {
|
||||
if ((i & 0x000F) === 0) {
|
||||
text += "\n" + addr.toHexWord() + ":";
|
||||
line++;
|
||||
}
|
||||
text += " ";
|
||||
if (anchorAddr && anchorAddr === addr) {
|
||||
anchorLine = line;
|
||||
}
|
||||
var hex = this.ram[addr].toString(16).toUpperCase();
|
||||
if (hex.length === 1) {
|
||||
text += "0";
|
||||
}
|
||||
text += hex;
|
||||
}
|
||||
return {text: text.substr(1), lineCount: line, anchorLine: anchorLine - 1};
|
||||
},
|
||||
|
||||
getWord: function (addr) {
|
||||
return addr < 0x4000 ? this.ram[addr] << 8 | this.ram[addr+1] : 0;
|
||||
},
|
||||
|
||||
getCharAt: function (x, y) {
|
||||
x -= 24;
|
||||
y -= 24;
|
||||
if (!this.textMode) {
|
||||
return this.ram[this.nameTable + Math.floor(x / 8) + Math.floor(y / 8) * 32];
|
||||
}
|
||||
else {
|
||||
return this.ram[this.nameTable + Math.floor((x - 8) / 6) + Math.floor(y / 8) * 40];
|
||||
}
|
||||
},
|
||||
|
||||
setFlicker: function (value) {
|
||||
this.flicker = value;
|
||||
this.enableFlicker = value;
|
||||
},
|
||||
|
||||
getState: function () {
|
||||
return {
|
||||
ram: this.ram,
|
||||
registers: this.registers,
|
||||
addressRegister: this.addressRegister,
|
||||
statusRegister: this.statusRegister,
|
||||
latch: this.latch,
|
||||
prefetchByte: this.prefetchByte,
|
||||
displayOn: this.displayOn,
|
||||
interruptsOn: this.interruptsOn,
|
||||
screenMode: this.screenMode,
|
||||
bitmapMode: this.bitmapMode,
|
||||
textMode: this.textMode,
|
||||
colorTable: this.colorTable,
|
||||
nameTable: this.nameTable,
|
||||
charPatternTable: this.charPatternTable,
|
||||
spriteAttributeTable: this.spriteAttributeTable,
|
||||
spritePatternTable: this.spritePatternTable,
|
||||
colorTableMask: this.colorTableMask,
|
||||
patternTableMask: this.patternTableMask,
|
||||
ramMask: this.ramMask,
|
||||
fgColor: this.fgColor,
|
||||
bgColor: this.bgColor,
|
||||
flicker: this.flicker
|
||||
};
|
||||
},
|
||||
|
||||
restoreState: function (state) {
|
||||
this.ram = state.ram;
|
||||
this.registers = state.registers;
|
||||
this.addressRegister = state.addressRegister;
|
||||
this.statusRegister = state.statusRegister;
|
||||
this.latch = state.latch;
|
||||
this.prefetchByte = state.prefetchByte;
|
||||
this.displayOn = state.displayOn;
|
||||
this.interruptsOn = state.interruptsOn;
|
||||
this.screenMode = state.screenMode;
|
||||
this.bitmapMode = state.bitmapMode;
|
||||
this.textMode = state.textMode;
|
||||
this.colorTable = state.colorTable;
|
||||
this.nameTable = state.nameTable;
|
||||
this.charPatternTable = state.charPatternTable;
|
||||
this.spriteAttributeTable = state.spriteAttributeTable;
|
||||
this.spritePatternTable = state.spritePatternTable;
|
||||
this.colorTableMask = state.colorTableMask;
|
||||
this.patternTableMask = state.patternTableMask;
|
||||
this.ramMask = state.ramMask;
|
||||
this.fgColor = state.fgColor;
|
||||
this.bgColor = state.bgColor;
|
||||
this.flicker = state.flicker;
|
||||
this.redrawRequired = true;
|
||||
}
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user