broken-neees
Version:
A really broken NEEES emulator that introduces glitches and random bugs on purpose!
147 lines (146 loc) • 8.25 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _Sprite = _interopRequireDefault(require("../lib/ppu/Sprite"));
var _Tile = _interopRequireDefault(require("./Tile"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function _typeof(obj) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) { return typeof obj; } : function (obj) { return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }, _typeof(obj); }
function _createForOfIteratorHelper(o, allowArrayLike) { var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"]; if (!it) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = it.call(o); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }
function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i]; return arr2; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return _typeof(key) === "symbol" ? key : String(key); }
function _toPrimitive(input, hint) { if (_typeof(input) !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (_typeof(res) !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
var TILE_SIZE_PIXELS = 8;
var SPRITE_SIZE_BYTES = 4;
var SPRITE_BYTE_Y = 0;
var SPRITE_BYTE_TILE_ID = 1;
var SPRITE_BYTE_ATTRIBUTES = 2;
var SPRITE_BYTE_X = 3;
var SPRITE_8x16_PATTERN_TABLE_MASK = 1;
var SPRITE_8x16_TILE_ID_MASK = 0xfe;
var MAX_SPRITES = 64;
var MAX_SPRITES_PER_SCANLINE = 8;
var SpriteRenderer = /*#__PURE__*/function () {
function SpriteRenderer(ppu) {
_classCallCheck(this, SpriteRenderer);
this.ppu = ppu;
}
_createClass(SpriteRenderer, [{
key: "renderScanline",
value: function renderScanline() {
var sprites = this._evaluate();
var buffer = this._render(sprites);
this._draw(buffer);
}
}, {
key: "_evaluate",
value: function _evaluate() {
var sprites = [];
for (var spriteId = 0; spriteId < MAX_SPRITES; spriteId++) {
var sprite = this._createSprite(spriteId);
if (sprite.shouldRenderInScanline(this.ppu.scanline) && sprites.length < MAX_SPRITES_PER_SCANLINE + 1) {
if (sprites.length < MAX_SPRITES_PER_SCANLINE) {
sprites.push(sprite);
} else {
this.ppu.registers.ppuStatus.spriteOverflow = 1;
break;
}
}
}
if (this.ppu.cpu.unbroken) {
return sprites.reverse();
} else {
// [!!!]
return sprites;
}
}
}, {
key: "_render",
value: function _render(sprites) {
var y = this.ppu.scanline;
var buffer = [];
var _iterator = _createForOfIteratorHelper(sprites),
_step;
try {
for (_iterator.s(); !(_step = _iterator.n()).done;) {
var sprite = _step.value;
var insideY = sprite.diffY(y);
var tileInsideY = insideY % TILE_SIZE_PIXELS;
var tile = new _Tile.default(this.ppu, sprite.patternTableId, sprite.tileIdFor(insideY), sprite.flipY ? TILE_SIZE_PIXELS - 1 - tileInsideY : tileInsideY);
var paletteColors = this.ppu.getPaletteColors(sprite.paletteId);
for (var insideX = 0; insideX < TILE_SIZE_PIXELS; insideX++) {
var x = sprite.x + insideX;
if (!this.ppu.registers.ppuMask.showSpritesInFirst8Pixels && x < 8) continue;
var colorIndex = tile.getColorIndex(sprite.flipX ? TILE_SIZE_PIXELS - 1 - insideX : insideX);
if (colorIndex > 0) {
var color = paletteColors[colorIndex];
buffer[x] = {
x: x,
color: color,
isInFrontOfBackground: sprite.isInFrontOfBackground
};
if (sprite.id === 0 && this.ppu.isBackgroundPixelOpaque(x, y) && this.ppu.registers.ppuMask.showBackground && this.ppu.registers.ppuMask.showSprites) this.ppu.registers.ppuStatus.sprite0Hit = 1;
}
}
}
} catch (err) {
_iterator.e(err);
} finally {
_iterator.f();
}
return buffer;
}
}, {
key: "_draw",
value: function _draw(buffer) {
var y = this.ppu.scanline;
var _iterator2 = _createForOfIteratorHelper(buffer),
_step2;
try {
for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
var object = _step2.value;
if (!object) continue;
var x = object.x,
color = object.color,
isInFrontOfBackground = object.isInFrontOfBackground;
var isBackgroundPixelOpaque = this.ppu.isBackgroundPixelOpaque(x, y);
var shouldDraw = isInFrontOfBackground || !isBackgroundPixelOpaque;
if (shouldDraw) this.ppu.plot(x, y, color);
}
} catch (err) {
_iterator2.e(err);
} finally {
_iterator2.f();
}
}
}, {
key: "_createSprite",
value: function _createSprite(id) {
var oamRam = this.ppu.memory.oamRam;
var ppuCtrl = this.ppu.registers.ppuCtrl;
var is8x16 = ppuCtrl.spriteSize === 1;
var address = id * SPRITE_SIZE_BYTES;
var yByte;
if (this.ppu.cpu.unbroken) {
yByte = oamRam[address + SPRITE_BYTE_Y];
} else {
// [!!!]
yByte = oamRam[address + SPRITE_BYTE_Y] + (id > 0 ? 10 : 0);
}
var tileIdByte = oamRam[address + SPRITE_BYTE_TILE_ID];
var attributes = oamRam[address + SPRITE_BYTE_ATTRIBUTES];
var x = oamRam[address + SPRITE_BYTE_X];
var y = yByte + 1;
var patternTableId = is8x16 ? tileIdByte & SPRITE_8x16_PATTERN_TABLE_MASK : ppuCtrl.sprite8x8PatternTableId;
var tileId = is8x16 ? tileIdByte & SPRITE_8x16_TILE_ID_MASK : tileIdByte;
return new _Sprite.default(this.ppu, id, x, y, is8x16, patternTableId, tileId, attributes);
}
}]);
return SpriteRenderer;
}();
exports.default = SpriteRenderer;