407 lines
15 KiB
TypeScript
407 lines
15 KiB
TypeScript
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import { Z80, Z80State } from "../common/cpu/ZilogZ80";
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import { BasicScanlineMachine } from "../common/devices";
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import { KeyFlags, newAddressDecoder, padBytes, noise, Keys, makeKeycodeMap, newKeyboardHandler, EmuHalt } from "../common/emu";
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import { TssChannelAdapter, MasterAudio, AY38910_Audio } from "../common/audio";
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import { hex } from "../common/util";
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const GALAXIAN_KEYCODE_MAP = makeKeycodeMap([
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[Keys.A, 0, 0x10], // P1
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[Keys.LEFT, 0, 0x4],
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[Keys.RIGHT, 0, 0x8],
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[Keys.P2_A, 1, 0x10], // P2
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[Keys.P2_LEFT, 1, 0x4],
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[Keys.P2_RIGHT, 1, 0x8],
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[Keys.SELECT, 0, 0x1],
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[Keys.START, 1, 0x1],
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[Keys.VK_2, 1, 0x2],
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]);
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const SCRAMBLE_KEYCODE_MAP = makeKeycodeMap([
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[Keys.UP, 0, -0x1], // P1
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[Keys.B, 0, -0x2], // fire
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[Keys.VK_7, 0, -0x4], // credit
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[Keys.A, 0, -0x8], // bomb
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[Keys.RIGHT, 0, -0x10],
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[Keys.LEFT, 0, -0x20],
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[Keys.VK_6, 0, -0x40],
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[Keys.SELECT, 0, -0x80],
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[Keys.START, 1, -0x80],
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[Keys.VK_2, 1, -0x40],
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[Keys.DOWN, 2, -0x40],
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//[Keys.VK_UP, 2, -0x10],
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]);
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const bitcolors = [
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0x000021, 0x000047, 0x000097, // red
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0x002100, 0x004700, 0x009700, // green
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0x510000, 0xae0000 // blue
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];
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const GalaxianVideo = function (rom: Uint8Array, vram: Uint8Array, oram: Uint8Array, palette: Uint32Array, options) {
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var gfxBase = options.gfxBase || 0x2800;
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this.missileWidth = options.missileWidth || 4;
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this.missileOffset = options.missileOffset || 0;
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this.showOffscreenObjects = false;
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this.frameCounter = 0;
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this.starsEnabled = 0;
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var stars = [];
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for (var i = 0; i < 256; i++)
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stars[i] = noise();
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this.advanceFrame = function () {
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this.frameCounter = (this.frameCounter + 1) & 0xff;
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}
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this.drawScanline = function (pixels, sl) {
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var pixofs = sl * 264;
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// hide offscreen on left + right (b/c rotated)
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if (!this.showOffscreenObjects && (sl < 16 || sl >= 240)) {
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for (var i = 0; i < 264; i++)
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pixels[pixofs + i] = 0xff000000;
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return; // offscreen
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}
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// draw tiles
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var outi = pixofs; // starting output pixel in frame buffer
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for (var xx = 0; xx < 32; xx++) {
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var xofs = xx;
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var scroll = oram[xofs * 2]; // even entries control scroll position
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var attrib = oram[xofs * 2 + 1]; // odd entries control the color base
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var sl2 = (sl + scroll) & 0xff;
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var vramofs = (sl2 >> 3) << 5; // offset in VRAM
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var yy = sl2 & 7; // y offset within tile
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var tile = vram[vramofs + xofs]; // TODO: why undefined?
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var color0 = (attrib & 7) << 2;
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var addr = gfxBase + (tile << 3) + yy;
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var data1 = rom[addr];
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var data2 = rom[addr + 0x800];
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for (var i = 0; i < 8; i++) {
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var bm = 128 >> i;
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var color = color0 + ((data1 & bm) ? 1 : 0) + ((data2 & bm) ? 2 : 0);
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pixels[outi] = palette[color];
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outi++;
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}
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}
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// draw sprites
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for (var sprnum = 7; sprnum >= 0; sprnum--) {
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var base = (sprnum << 2) + 0x40;
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var base0 = oram[base];
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var sy = 240 - (base0 - ((sprnum < 3) ? 1 : 0)); // the first three sprites match against y-1
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var yy = (sl - sy);
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if (yy >= 0 && yy < 16) {
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var sx = oram[base + 3] + 1; // +1 pixel offset from tiles
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if (sx == 0 && !this.showOffscreenObjects) {
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continue; // drawn off-buffer
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}
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var code = oram[base + 1];
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var flipx = code & 0x40; // TODO: flipx
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if (code & 0x80) // flipy
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yy = 15 - yy;
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code &= 0x3f;
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var color0 = (oram[base + 2] & 7) << 2;
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var addr = gfxBase + (code << 5) + (yy < 8 ? yy : yy + 8);
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outi = pixofs + sx; //<< 1
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var data1 = rom[addr];
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var data2 = rom[addr + 0x800];
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for (var i = 0; i < 8; i++) {
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var bm = 128 >> i;
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var color = ((data1 & bm) ? 1 : 0) + ((data2 & bm) ? 2 : 0);
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if (color)
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pixels[flipx ? (outi + 15 - i) : (outi + i)] = palette[color0 + color];
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}
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var data1 = rom[addr + 8];
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var data2 = rom[addr + 0x808];
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for (var i = 0; i < 8; i++) {
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var bm = 128 >> i;
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var color = ((data1 & bm) ? 1 : 0) + ((data2 & bm) ? 2 : 0);
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if (color)
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pixels[flipx ? (outi + 7 - i) : (outi + i + 8)] = palette[color0 + color];
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}
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}
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}
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// draw bullets/shells
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var shell = 0xff;
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var missile = 0xff;
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for (var which = 0; which < 8; which++) {
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var sy = oram[0x60 + (which << 2) + 1];
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if (((sy + sl - ((which < 3) ? 1 : 0)) & 0xff) == 0xff) {
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if (which != 7)
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shell = which;
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else
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missile = which;
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}
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}
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for (var i = 0; i < 2; i++) {
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which = i ? missile : shell;
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if (which != 0xff) {
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var sx = 255 - oram[0x60 + (which << 2) + 3];
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var outi = pixofs + sx - this.missileOffset;
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var col = which == 7 ? 0xffffff00 : 0xffffffff;
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for (var j = 0; j < this.missileWidth; j++)
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pixels[outi++] = col;
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}
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}
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// draw stars
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if (this.starsEnabled) {
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var starx = ((this.frameCounter + stars[sl & 0xff]) & 0xff);
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if ((starx + sl) & 0x10) {
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var outi = pixofs + starx;
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if ((pixels[outi] & 0xffffff) == 0) {
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pixels[outi] = palette[sl & 0x1f];
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}
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}
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}
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}
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}
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const XTAL = 18432000.0;
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const scanlinesPerFrame = 264;
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const cpuFrequency = XTAL / 6; // 3.072 MHz
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const hsyncFrequency = XTAL / 3 / 192 / 2; // 16 kHz
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const vsyncFrequency = hsyncFrequency / 132 / 2; // 60.606060 Hz
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const vblankDuration = 1 / vsyncFrequency * (20 / 132); // 2500 us
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const cpuCyclesPerLine = cpuFrequency / hsyncFrequency;
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const INITIAL_WATCHDOG = 8;
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const audioOversample = 2;
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const audioSampleRate = 60 * scanlinesPerFrame; // why not hsync?
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export class GalaxianMachine extends BasicScanlineMachine {
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options = {};
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palBase = 0x3800;
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keyMap = GALAXIAN_KEYCODE_MAP;
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cpuFrequency = cpuFrequency;
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canvasWidth = 264;
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numTotalScanlines = 264;
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numVisibleScanlines = 264;
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defaultROMSize = 0x4000;
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sampleRate = audioSampleRate * audioOversample;
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cpuCyclesPerLine = cpuCyclesPerLine | 0;
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rotate = 90;
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cpu: Z80 = new Z80();
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ram = new Uint8Array(0x800);
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vram = new Uint8Array(0x400);
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oram = new Uint8Array(0x100);
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palette: Uint32Array;
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gfx; // GalaxianVideo
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audioadapter;
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psg1: AY38910_Audio;
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psg2: AY38910_Audio;
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watchdog_counter: number = 0;
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interruptEnabled: number = 0;
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defaultInputs: number[] = [0xe, 0x8, 0x0];
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constructor() {
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super();
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var audio = new MasterAudio();
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this.psg1 = new AY38910_Audio(audio);
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this.psg2 = new AY38910_Audio(audio);
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this.audioadapter = new TssChannelAdapter([this.psg1.psg, this.psg2.psg], audioOversample, this.sampleRate);
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this.init();
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}
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init() {
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this.rom = new Uint8Array(this.defaultROMSize);
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this.palette = new Uint32Array(new ArrayBuffer(32 * 4));
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this.gfx = new GalaxianVideo(this.rom, this.vram, this.oram, this.palette, this.options);
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this.connectCPUMemoryBus(this);
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this.connectCPUIOBus(this.newIOBus());
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this.inputs.set(this.defaultInputs);
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this.handler = newKeyboardHandler(this.inputs, this.keyMap);
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}
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read = newAddressDecoder([
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[0x0000, 0x3fff, 0, (a) => { return this.rom ? this.rom[a] : null; }],
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[0x4000, 0x47ff, 0x3ff, (a) => { return this.ram[a]; }],
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[0x5000, 0x57ff, 0x3ff, (a) => { return this.vram[a]; }],
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[0x5800, 0x5fff, 0xff, (a) => { return this.oram[a]; }],
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[0x6000, 0x6000, 0, (a) => { return this.inputs[0]; }],
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[0x6800, 0x6800, 0, (a) => { return this.inputs[1]; }],
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[0x7000, 0x7000, 0, (a) => { return this.inputs[2]; }],
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[0x7800, 0x7800, 0, (a) => { this.watchdog_counter = INITIAL_WATCHDOG; }],
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]);
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readConst(a : number) {
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return (a < 0x7000) ? this.read(a) : null;
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}
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write = newAddressDecoder([
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[0x4000, 0x47ff, 0x3ff, (a, v) => { this.ram[a] = v; }],
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[0x5000, 0x57ff, 0x3ff, (a, v) => { this.vram[a] = v; }],
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[0x5800, 0x5fff, 0xff, (a, v) => { this.oram[a] = v; }],
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//[0x6004, 0x6007, 0x3, function(a,v) => { }], // lfo freq
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//[0x6800, 0x6807, 0x7, function(a,v) => { }], // sound
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//[0x7800, 0x7800, 0x7, function(a,v) => { }], // pitch
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//[0x6000, 0x6003, 0x3, (a, v) => { this.outlatches[a] = v; }],
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[0x7001, 0x7001, 0, (a, v) => { this.interruptEnabled = v & 1; }],
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[0x7004, 0x7004, 0, (a, v) => { this.gfx.starsEnabled = v & 1; }],
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]);
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newIOBus() {
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return {
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read: (addr) => {
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return 0;
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},
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write: (addr, val) => {
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if (addr & 0x1) { this.psg1.selectRegister(val & 0xf); };
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if (addr & 0x2) { this.psg1.setData(val); };
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if (addr & 0x4) { this.psg2.selectRegister(val & 0xf); };
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if (addr & 0x8) { this.psg2.setData(val); };
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}
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};
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}
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reset() {
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super.reset();
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this.psg1.reset();
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this.psg2.reset();
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this.watchdog_counter = INITIAL_WATCHDOG;
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}
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startScanline() {
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this.audio && this.audioadapter && this.audioadapter.generate(this.audio);
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}
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drawScanline() {
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this.gfx.drawScanline(this.pixels, this.scanline);
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}
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advanceFrame(trap) {
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var steps = super.advanceFrame(trap);
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// advance graphics
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this.gfx.advanceFrame();
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// clear bottom of screen?
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if (!this.gfx.showOffscreenObjects) {
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for (var i = 0; i < 264; i++)
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this.pixels.fill(0xff000000, 256 + i * 264, 264 + i * 264);
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}
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// watchdog fired?
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if (this.watchdog_counter-- <= 0) {
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throw new EmuHalt("WATCHDOG FIRED");
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}
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// NMI interrupt @ 0x66
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if (this.interruptEnabled) { this.cpu.NMI(); }
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return steps;
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}
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loadROM(data) {
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this.rom.set(padBytes(data, this.defaultROMSize));
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for (var i = 0; i < 32; i++) {
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var b = this.rom[this.palBase + i];
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this.palette[i] = 0xff000000;
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for (var j = 0; j < 8; j++)
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if (((1 << j) & b))
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this.palette[i] += bitcolors[j];
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}
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}
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loadState(state) {
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super.loadState(state);
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this.vram.set(state.bv);
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this.oram.set(state.bo);
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this.watchdog_counter = state.wdc;
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this.interruptEnabled = state.ie;
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this.gfx.starsEnabled = state.se;
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this.gfx.frameCounter = state.fc;
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}
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saveState() {
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var state = super.saveState();
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state['bv'] = this.vram.slice(0);
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state['bo'] = this.oram.slice(0);
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state['fc'] = this.gfx.frameCounter;
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state['ie'] = this.interruptEnabled;
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state['se'] = this.gfx.starsEnabled;
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state['wdc'] = this.watchdog_counter;
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return state;
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}
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}
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export class GalaxianScrambleMachine extends GalaxianMachine {
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defaultROMSize = 0x5020;
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palBase = 0x5000;
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scramble = true;
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keyMap = SCRAMBLE_KEYCODE_MAP;
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options = {
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gfxBase: 0x4000,
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missileWidth: 1,
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missileOffset: 6,
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};
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defaultInputs = [0xff, 0xfc, 0xf1];
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constructor() {
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super();
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this.init(); // TODO: why do we have to call twice?
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}
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read = newAddressDecoder([
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[0x0000, 0x3fff, 0, (a) => { return this.rom[a]; }],
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[0x4000, 0x47ff, 0x7ff, (a) => { return this.ram[a]; }],
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[0x4800, 0x4fff, 0x3ff, (a) => { return this.vram[a]; }],
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[0x5000, 0x5fff, 0xff, (a) => { return this.oram[a]; }],
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[0x7000, 0x7000, 0, (a) => { this.watchdog_counter = INITIAL_WATCHDOG; }],
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[0x7800, 0x7800, 0, (a) => { this.watchdog_counter = INITIAL_WATCHDOG; }],
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//[0x8000, 0x820f, 0, function(a) { return noise(); }], // TODO: remove
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[0x8100, 0x8100, 0, (a) => { return this.inputs[0]; }],
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[0x8101, 0x8101, 0, (a) => { return this.inputs[1]; }],
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[0x8102, 0x8102, 0, (a) => { return this.inputs[2] | this.scramble_protection_alt_r(); }],
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[0x8202, 0x8202, 0, (a) => { return this.m_protection_result; }], // scramble (protection)
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[0x9100, 0x9100, 0, (a) => { return this.inputs[0]; }],
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[0x9101, 0x9101, 0, (a) => { return this.inputs[1]; }],
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[0x9102, 0x9102, 0, (a) => { return this.inputs[2] | this.scramble_protection_alt_r(); }],
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[0x9212, 0x9212, 0, (a) => { return this.m_protection_result; }], // scramble (protection)
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//[0, 0xffff, 0, function(a) { console.log(hex(a)); return 0; }]
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]);
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write = newAddressDecoder([
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[0x4000, 0x47ff, 0x7ff, (a, v) => { this.ram[a] = v; }],
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[0x4800, 0x4fff, 0x3ff, (a, v) => { this.vram[a] = v; }],
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[0x5000, 0x5fff, 0xff, (a, v) => { this.oram[a] = v; }],
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[0x6801, 0x6801, 0, (a, v) => { this.interruptEnabled = v & 1; /*console.log(a,v,cpu.getPC().toString(16));*/ }],
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[0x6802, 0x6802, 0, (a, v) => { /* TODO: coin counter */ }],
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[0x6803, 0x6803, 0, (a, v) => { /* TODO: backgroundColor = (v & 1) ? 0xFF000056 : 0xFF000000; */ }],
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[0x6804, 0x6804, 0, (a, v) => { this.gfx.starsEnabled = v & 1; }],
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[0x6808, 0x6808, 0, (a, v) => { this.gfx.missileWidth = v; }], // not on h/w
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[0x6809, 0x6809, 0, (a, v) => { this.gfx.missileOffset = v; }], // not on h/w
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[0x8202, 0x8202, 0, this.scramble_protection_w.bind(this)],
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//[0x8100, 0x8103, 0, function(a,v){ /* PPI 0 */ }],
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//[0x8200, 0x8203, 0, function(a,v){ /* PPI 1 */ }],
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//[0, 0xffff, 0, function(a,v) { console.log(hex(a),hex(v)); }]
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]);
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m_protection_state = 0;
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m_protection_result = 0;
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scramble_protection_w(addr, data) {
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/*
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This is not fully understood; the low 4 bits of port C are
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inputs; the upper 4 bits are outputs. Scramble main set always
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writes sequences of 3 or more nibbles to the low port and
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expects certain results in the upper nibble afterwards.
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*/
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this.m_protection_state = (this.m_protection_state << 4) | (data & 0x0f);
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switch (this.m_protection_state & 0xfff) {
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/* scramble */
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case 0xf09: this.m_protection_result = 0xff; break;
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case 0xa49: this.m_protection_result = 0xbf; break;
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case 0x319: this.m_protection_result = 0x4f; break;
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case 0x5c9: this.m_protection_result = 0x6f; break;
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/* scrambls */
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case 0x246: this.m_protection_result ^= 0x80; break;
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case 0xb5f: this.m_protection_result = 0x6f; break;
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}
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}
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scramble_protection_alt_r() {
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var bit = (this.m_protection_result >> 7) & 1;
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return (bit << 5) | ((bit ^ 1) << 7);
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}
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}
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