mirror of
https://github.com/sehugg/8bitworkshop.git
synced 2025-02-18 00:30:43 +00:00
cleaned up galaxian platform
This commit is contained in:
Steven Hugg
parent
698d0c616c
commit
43f65b99ae
@ -1,4 +1,3 @@
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"use strict";
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import { Platform, BaseZ80Platform } from "../baseplatform";
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import { PLATFORMS, RAM, newAddressDecoder, padBytes, noise, setKeyboardFromMap, AnimationTimer, RasterVideo, Keys, makeKeycodeMap } from "../emu";
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@ -37,43 +36,25 @@ const SCRAMBLE_KEYCODE_MAP = makeKeycodeMap([
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//[Keys.VK_UP, 2, -0x10],
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]);
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const GalaxianVideo = function(rom:Uint8Array, vram:RAM, oram:RAM, palette:Uint32Array, options) {
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const _GalaxianPlatform = function(mainElement, options) {
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options = options || {};
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var romSize = options.romSize || 0x4000;
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var gfxBase = options.gfxBase || 0x2800;
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var palBase = options.palBase || 0x3800;
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var keyMap = options.keyMap || GALAXIAN_KEYCODE_MAP;
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var missileWidth = options.missileWidth || 4;
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var missileOffset = options.missileOffset || 0;
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var cpu;
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var ram, vram, oram : RAM;
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var membus, iobus, rom, palette, outlatches;
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var video, audio, timer, pixels;
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var psg1, psg2;
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var inputs;
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var interruptEnabled = 0;
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var starsEnabled = 0;
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var watchdog_counter;
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var frameCounter = 0;
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var XTAL = 18432000.0;
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var scanlinesPerFrame = 264;
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var cpuFrequency = XTAL/6; // 3.072 MHz
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var hsyncFrequency = XTAL/3/192/2; // 16 kHz
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var vsyncFrequency = hsyncFrequency/132/2; // 60.606060 Hz
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var vblankDuration = 1/vsyncFrequency * (20/132); // 2500 us
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var cpuCyclesPerLine = cpuFrequency/hsyncFrequency;
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var INITIAL_WATCHDOG = 8;
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var showOffscreenObjects = false;
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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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function drawScanline(pixels, sl) {
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if (sl < 16 && !showOffscreenObjects) return; // offscreen
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if (sl >= 240 && !showOffscreenObjects) return; // offscreen
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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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if (sl < 16 && !this.showOffscreenObjects) return; // offscreen
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if (sl >= 240 && !this.showOffscreenObjects) return; // offscreen
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// draw tiles
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var pixofs = sl * 264;
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var outi = pixofs; // starting output pixel in frame buffer
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@ -104,7 +85,7 @@ const _GalaxianPlatform = function(mainElement, options) {
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var yy = (sl - sy);
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if (yy >= 0 && yy < 16) {
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var sx = oram.mem[base + 3] + 1; // +1 pixel offset from tiles
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if (sx == 0 && !showOffscreenObjects)
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if (sx == 0 && !this.showOffscreenObjects)
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continue; // drawn off-buffer
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var code = oram.mem[base + 1];
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var flipx = code & 0x40; // TODO: flipx
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@ -112,7 +93,6 @@ const _GalaxianPlatform = function(mainElement, options) {
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yy = 15 - yy;
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code &= 0x3f;
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var color0 = (oram.mem[base + 2] & 7) << 2;
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var color0 = 0;
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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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@ -149,15 +129,15 @@ const _GalaxianPlatform = function(mainElement, options) {
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which = i ? missile : shell;
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if (which != 0xff) {
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var sx = 255 - oram.mem[0x60 + (which << 2) + 3];
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var outi = pixofs+sx-missileOffset;
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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<missileWidth; j++)
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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 (starsEnabled) {
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var starx = ((frameCounter + stars[sl & 0xff]) & 0xff);
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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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@ -167,6 +147,33 @@ const _GalaxianPlatform = function(mainElement, options) {
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}
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}
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}
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const _GalaxianPlatform = function(mainElement, options) {
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options = options || {};
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var romSize = options.romSize || 0x4000;
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var palBase = options.palBase || 0x3800;
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var keyMap = options.keyMap || GALAXIAN_KEYCODE_MAP;
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var cpu;
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var ram, vram, oram: RAM;
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var membus, iobus, rom, palette, outlatches;
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var video, audio, timer, pixels;
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var psg1, psg2;
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var inputs;
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var interruptEnabled = 0;
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var watchdog_counter;
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var XTAL = 18432000.0;
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var scanlinesPerFrame = 264;
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var cpuFrequency = XTAL / 6; // 3.072 MHz
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var hsyncFrequency = XTAL / 3 / 192 / 2; // 16 kHz
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var vsyncFrequency = hsyncFrequency / 132 / 2; // 60.606060 Hz
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var vblankDuration = 1 / vsyncFrequency * (20 / 132); // 2500 us
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var cpuCyclesPerLine = cpuFrequency / hsyncFrequency;
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var INITIAL_WATCHDOG = 8;
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var gfx; // = new GalaxianVideo(rom, vram, oram, palette, options);
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var m_protection_state = 0;
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var m_protection_result = 0;
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function scramble_protection_w(addr, data) {
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@ -177,8 +184,7 @@ const _GalaxianPlatform = function(mainElement, options) {
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expects certain results in the upper nibble afterwards.
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*/
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m_protection_state = (m_protection_state << 4) | (data & 0x0f);
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switch (m_protection_state & 0xfff)
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{
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switch (m_protection_state & 0xfff) {
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/* scramble */
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case 0xf09: m_protection_result = 0xff; break;
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case 0xa49: m_protection_result = 0xbf; break;
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@ -214,6 +220,10 @@ const _GalaxianPlatform = function(mainElement, options) {
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ram = new RAM(0x800);
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vram = new RAM(0x400);
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oram = new RAM(0x100);
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rom = new Uint8Array(romSize);
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palette = new Uint32Array(new ArrayBuffer(32 * 4));
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gfx = new GalaxianVideo(rom, vram, oram, palette, options);
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outlatches = new RAM(0x8);
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if (options.scramble) {
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inputs = [0xff, 0xfc, 0xf1];
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@ -243,9 +253,9 @@ const _GalaxianPlatform = function(mainElement, options) {
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[0x6801, 0x6801, 0, function(a, v) { interruptEnabled = v & 1; /*console.log(a,v,cpu.getPC().toString(16));*/ }],
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[0x6802, 0x6802, 0, function(a, v) { /* TODO: coin counter */ }],
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[0x6803, 0x6803, 0, function(a, v) { /* TODO: backgroundColor = (v & 1) ? 0xFF000056 : 0xFF000000; */ }],
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[0x6804, 0x6804, 0, function(a,v) { starsEnabled = v & 1; }],
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[0x6808, 0x6808, 0, function(a,v) { missileWidth = v; }], // not on h/w
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[0x6809, 0x6809, 0, function(a,v) { missileOffset = v; }], // not on h/w
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[0x6804, 0x6804, 0, function(a, v) { gfx.starsEnabled = v & 1; }],
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[0x6808, 0x6808, 0, function(a, v) { gfx.missileWidth = v; }], // not on h/w
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[0x6809, 0x6809, 0, function(a, v) { gfx.missileOffset = v; }], // not on h/w
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[0x8202, 0x8202, 0, scramble_protection_w],
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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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@ -274,7 +284,7 @@ const _GalaxianPlatform = function(mainElement, options) {
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//[0x7800, 0x7800, 0x7, function(a,v) { }], // pitch
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[0x6000, 0x6003, 0x3, function(a, v) { outlatches.mem[a] = v; }],
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[0x7001, 0x7001, 0, function(a, v) { interruptEnabled = v & 1; }],
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[0x7004, 0x7004, 0, function(a,v) { starsEnabled = v & 1; }],
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[0x7004, 0x7004, 0, function(a, v) { gfx.starsEnabled = v & 1; }],
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]),
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isContended: function() { return false; },
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};
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@ -312,15 +322,15 @@ const _GalaxianPlatform = function(mainElement, options) {
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for (var sl = 0; sl < scanlinesPerFrame; sl++) {
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this.scanline = sl;
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if (!novideo) {
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drawScanline(pixels, sl);
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gfx.drawScanline(pixels, sl);
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}
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this.runCPU(cpu, cpuCyclesPerLine);
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}
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// visible area is 256x224 (before rotation)
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if (!novideo) {
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video.updateFrame(0, 0, 0, 0, showOffscreenObjects ? 264 : 256, 264);
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video.updateFrame(0, 0, 0, 0, gfx.showOffscreenObjects ? 264 : 256, 264);
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}
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frameCounter = (frameCounter + 1) & 0xff;
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gfx.advanceFrame();
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if (watchdog_counter-- <= 0) {
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console.log("WATCHDOG FIRED, PC ", hex(cpu.getPC())); // TODO: alert on video
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this.reset();
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@ -332,9 +342,8 @@ const _GalaxianPlatform = function(mainElement, options) {
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getRasterScanline() { return this.scanline; }
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loadROM(title, data) {
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rom = padBytes(data, romSize);
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rom.set(padBytes(data, romSize));
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palette = new Uint32Array(new ArrayBuffer(32*4));
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for (var i = 0; i < 32; i++) {
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var b = rom[palBase + i];
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palette[i] = 0xff000000;
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@ -342,6 +351,7 @@ const _GalaxianPlatform = function(mainElement, options) {
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if (((1 << j) & b))
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palette[i] += bitcolors[j];
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}
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this.reset();
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}
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@ -352,8 +362,8 @@ const _GalaxianPlatform = function(mainElement, options) {
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oram.mem.set(state.bo);
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watchdog_counter = state.wdc;
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interruptEnabled = state.ie;
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starsEnabled = state.se;
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frameCounter = state.fc;
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gfx.starsEnabled = state.se;
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gfx.frameCounter = state.fc;
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inputs[0] = state.in0;
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inputs[1] = state.in1;
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inputs[2] = state.in2;
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@ -364,9 +374,9 @@ const _GalaxianPlatform = function(mainElement, options) {
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b: ram.mem.slice(0),
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bv: vram.mem.slice(0),
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bo: oram.mem.slice(0),
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fc:frameCounter,
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fc: gfx.frameCounter,
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ie: interruptEnabled,
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se:starsEnabled,
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se: gfx.starsEnabled,
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wdc: watchdog_counter,
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in0: inputs[0],
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in1: inputs[1],
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