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AutotileDefinition,
AutotileType,
SceneTilemapLayer,
SceneTilemapData,
} from "shared/lib/resources/types";
import {
clearGridSelection,
moveGridSelection,
type GridOffset,
type GridSelection,
} from "./grid";
import { MAX_SCENE_TILE_COUNT } from "consts";
export const moveTilemapLayerSelection = (
layer: SceneTilemapLayer,
sceneWidth: number,
sceneHeight: number,
selection: GridSelection,
offset: GridOffset,
): SceneTilemapLayer => {
const tiles = moveGridSelection(
layer.tiles,
sceneWidth,
sceneHeight,
selection,
offset,
0,
);
const autotiles = layer.autotiles
? moveGridSelection(
layer.autotiles,
sceneWidth,
sceneHeight,
selection,
offset,
0,
)
: undefined;
return {
...layer,
tiles,
...(autotiles ? { autotiles } : {}),
};
};
export const clearTilemapLayerSelection = (
layer: SceneTilemapLayer,
sceneWidth: number,
sceneHeight: number,
selection: GridSelection,
): SceneTilemapLayer => {
const tiles = clearGridSelection(
layer.tiles,
sceneWidth,
sceneHeight,
selection,
0,
);
const autotiles = layer.autotiles
? clearGridSelection(layer.autotiles, sceneWidth, sceneHeight, selection, 0)
: undefined;
return {
...layer,
tiles,
...(autotiles ? { autotiles } : {}),
};
};
export interface SceneTilesetIndexEntry {
tilesetId: string;
tilesetIndex: number;
width: number;
height: number;
offset: number;
count: number;
}
export interface DecodedSceneTileRef {
absoluteIndex: number;
tilesetIndex: number;
tileIndex: number;
tilesetId: string;
tilesetOffset: number;
}
export interface SceneTilesetLookup {
entries: SceneTilesetIndexEntry[];
entryByTilesetId: Map<string, SceneTilesetIndexEntry>;
entryByAbsoluteIndex: Array<SceneTilesetIndexEntry | undefined>;
}
// The 16 possible 2x2 autotile shapes. Bits run clockwise around the corners:
// NW, NE, SE, SW. Variants are stored in a 4x4 block in this stable order,
// starting at the tile selected in the palette.
export const AUTOTILE_VARIANT_MASKS: readonly number[] = [
8, 6, 13, 12, 5, 14, 15, 11, 2, 3, 7, 9, 0, 4, 10, 1,
];
export const autotileGroupSize = (type: AutotileType): number =>
type === "9slice" ? 3 : 4;
export const isAutotileDefinitionWithinBounds = (
definition: AutotileDefinition,
width: number,
height: number,
): boolean => {
Iif (width <= 0 || height <= 0) {
return false;
}
const x = definition.startTile % width;
const y = Math.floor(definition.startTile / width);
const groupSize = autotileGroupSize(definition.type);
return x + groupSize <= width && y + groupSize <= height;
};
export const isTileWithinAutotileDefinition = (
tileIndex: number,
tilesetWidth: number,
definition: AutotileDefinition,
): boolean => {
Iif (tilesetWidth <= 0) {
return false;
}
const clickedX = tileIndex % tilesetWidth;
const clickedY = Math.floor(tileIndex / tilesetWidth);
const groupX = definition.startTile % tilesetWidth;
const groupY = Math.floor(definition.startTile / tilesetWidth);
const groupSize = autotileGroupSize(definition.type);
return (
clickedX >= groupX &&
clickedX < groupX + groupSize &&
clickedY >= groupY &&
clickedY < groupY + groupSize
);
};
// Inverse lookup: connectivity mask to tile offset within the variant block.
const AUTOTILE_MASK_TO_VARIANT: readonly number[] = [
12, 15, 8, 9, 13, 4, 1, 10, 0, 11, 14, 7, 3, 2, 5, 6,
];
type ResolvedAutotileSource = {
definitionId: number;
type: AutotileType;
tilesetOffset: number;
tileIndex: number;
tilesetWidth: number;
};
const resolveAutotileVariant = (
source: ResolvedAutotileSource,
north: boolean,
east: boolean,
south: boolean,
west: boolean,
connected: (offsetX: number, offsetY: number) => boolean,
): number => {
if (source.type === "9slice") {
const variantX = !west ? 0 : !east ? 2 : 1;
const variantY = !north ? 0 : !south ? 2 : 1;
return encodeSceneTileRef(
source.tilesetOffset,
source.tileIndex + variantX + variantY * source.tilesetWidth,
);
}
let mask = 0;
if (north && west && connected(-1, -1)) mask |= 1;
if (north && east && connected(1, -1)) mask |= 2;
if (south && east && connected(1, 1)) mask |= 4;
if (south && west && connected(-1, 1)) mask |= 8;
const variant = AUTOTILE_MASK_TO_VARIANT[mask] ?? -1;
return variant >= 0
? encodeSceneTileRef(
source.tilesetOffset,
source.tileIndex +
(variant % 4) +
Math.floor(variant / 4) * source.tilesetWidth,
)
: 0;
};
export const resolveSceneAutotiles = (
autotiles: readonly number[],
width: number,
height: number,
tilemap: Pick<SceneTilemapData, "tilesets" | "autotiles">,
): number[] => {
const size = width * height;
const tilesetLookup = buildSceneTilesetLookup(tilemap);
const autotileSources = new Array<ResolvedAutotileSource | undefined>(size);
for (let index = 0; index < size; index++) {
const definitionId = autotiles[index] ?? 0;
const definition = tilemap.autotiles?.[definitionId - 1];
const ref = definition
? decodeSceneTileRef(definition.startTile, tilesetLookup)
: undefined;
if (!ref || !definition) {
continue;
}
const tilesetWidth = tilesetLookup.entries[ref.tilesetIndex]?.width;
Iif (!tilesetWidth) {
continue;
}
autotileSources[index] = {
definitionId,
type: definition.type,
tilesetOffset: ref.tilesetOffset,
tileIndex: ref.tileIndex,
tilesetWidth,
};
}
const connected = (
source: ResolvedAutotileSource,
x: number,
y: number,
offsetX: number,
offsetY: number,
) => {
const neighbourX = x + offsetX;
const neighbourY = y + offsetY;
if (
neighbourX < 0 ||
neighbourY < 0 ||
neighbourX >= width ||
neighbourY >= height
) {
return true;
}
return (
autotileSources[neighbourY * width + neighbourX]?.definitionId ===
source.definitionId
);
};
const resolved = new Array<number>(size).fill(0);
for (let index = 0; index < size; index++) {
const source = autotileSources[index];
if (!source) {
continue;
}
const x = index % width;
const y = Math.floor(index / width);
const north = connected(source, x, y, 0, -1);
const east = connected(source, x, y, 1, 0);
const south = connected(source, x, y, 0, 1);
const west = connected(source, x, y, -1, 0);
resolved[index] = resolveAutotileVariant(
source,
north,
east,
south,
west,
(offsetX, offsetY) => connected(source, x, y, offsetX, offsetY),
);
}
return resolved;
};
export const resolveSceneAutotilesForCells = (
autotiles: readonly number[],
width: number,
height: number,
tilemap: Pick<SceneTilemapData, "tilesets" | "autotiles">,
cellIndexes: Iterable<number>,
): Map<number, number> => {
const tilesetLookup = buildSceneTilesetLookup(tilemap);
const sourceCache = new Map<number, ResolvedAutotileSource | undefined>();
const sourceAt = (index: number) => {
if (sourceCache.has(index)) {
return sourceCache.get(index);
}
const definitionId = autotiles[index] ?? 0;
const definition = tilemap.autotiles?.[definitionId - 1];
const ref = definition
? decodeSceneTileRef(definition.startTile, tilesetLookup)
: undefined;
const tilesetWidth = ref
? tilesetLookup.entries[ref.tilesetIndex]?.width
: undefined;
const source =
ref && definition && tilesetWidth
? {
definitionId,
type: definition.type,
tilesetOffset: ref.tilesetOffset,
tileIndex: ref.tileIndex,
tilesetWidth,
}
: undefined;
sourceCache.set(index, source);
return source;
};
const connected = (
source: ResolvedAutotileSource,
x: number,
y: number,
offsetX: number,
offsetY: number,
) => {
const neighbourX = x + offsetX;
const neighbourY = y + offsetY;
if (
neighbourX < 0 ||
neighbourY < 0 ||
neighbourX >= width ||
neighbourY >= height
) {
return true;
}
return (
sourceAt(neighbourY * width + neighbourX)?.definitionId ===
source.definitionId
);
};
const resolved = new Map<number, number>();
for (const index of cellIndexes) {
const source = sourceAt(index);
if (!source) {
resolved.set(index, 0);
continue;
}
const x = index % width;
const y = Math.floor(index / width);
const north = connected(source, x, y, 0, -1);
const east = connected(source, x, y, 1, 0);
const south = connected(source, x, y, 0, 1);
const west = connected(source, x, y, -1, 0);
resolved.set(
index,
resolveAutotileVariant(
source,
north,
east,
south,
west,
(offsetX, offsetY) => connected(source, x, y, offsetX, offsetY),
),
);
}
return resolved;
};
export const buildSceneTilesetLookup = (
tilemap: Pick<SceneTilemapData, "tilesets">,
): SceneTilesetLookup => {
let offset = 0;
const entries: SceneTilesetIndexEntry[] = [];
const entryByTilesetId = new Map<string, SceneTilesetIndexEntry>();
const entryByAbsoluteIndex: Array<SceneTilesetIndexEntry | undefined> = [];
for (const [tilesetIndex, tileset] of tilemap.tilesets.entries()) {
const width = Math.max(0, Math.floor(tileset.width));
const height = Math.max(0, Math.floor(tileset.height));
const count = width * height;
const entry = {
tilesetId: tileset.id,
tilesetIndex,
width,
height,
offset,
count,
};
entries.push(entry);
if (!entryByTilesetId.has(entry.tilesetId)) {
entryByTilesetId.set(entry.tilesetId, entry);
}
for (let i = 0; i < count; i++) {
entryByAbsoluteIndex[offset + i] = entry;
}
offset += count;
}
return {
entries,
entryByTilesetId,
entryByAbsoluteIndex,
};
};
export const encodeSceneTileRef = (
tilesetOffset: number,
tileIndex = 0,
): number => {
return tilesetOffset + tileIndex + 1;
};
export const decodeSceneTileRef = (
value: number,
lookup: SceneTilesetLookup,
): DecodedSceneTileRef | undefined => {
if (!value) {
return undefined;
}
const absoluteIndex = value - 1;
const entry = lookup.entryByAbsoluteIndex[absoluteIndex];
if (!entry) {
return undefined;
}
return {
absoluteIndex,
tilesetIndex: entry.tilesetIndex,
tileIndex: absoluteIndex - entry.offset,
tilesetId: entry.tilesetId,
tilesetOffset: entry.offset,
};
};
export const sceneStampLinePositions = (
startX: number,
startY: number,
endX: number,
endY: number,
stampWidth: number,
stampHeight: number,
): Array<{ x: number; y: number }> => {
const dx = endX - startX;
const dy = endY - startY;
const distance = Math.max(
Math.abs(dx) / Math.max(1, stampWidth),
Math.abs(dy) / Math.max(1, stampHeight),
);
const steps = Math.floor(distance);
const positions: Array<{ x: number; y: number }> = [];
for (let step = 1; step <= steps; step++) {
positions.push({
x: startX + Math.round((dx * step) / distance),
y: startY + Math.round((dy * step) / distance),
});
}
return positions;
};
export const getTilemapLayersTileColors = (
tilemap: SceneTilemapData,
width: number,
height: number,
): number[] => {
const size = width * height;
const tileColors = tilemap.tileColors ?? [];
return tileColors
.slice(0, size)
.concat(new Array(Math.max(0, size - tileColors.length)).fill(0));
};
export { flattenTilemapLayers } from "shared/lib/tiles/sceneTilemapReferences";
export const isSceneAutotileDefinitionValid = (
definition: AutotileDefinition,
tilesetLookup: SceneTilesetLookup,
): boolean => {
const ref = decodeSceneTileRef(definition.startTile, tilesetLookup);
const entry = ref ? tilesetLookup.entries[ref.tilesetIndex] : undefined;
if (!ref || !entry || entry.width <= 0) return false;
return isAutotileDefinitionWithinBounds(
{ ...definition, startTile: ref.tileIndex },
entry.width,
entry.height,
);
};
export const remapSceneAutotileDefinitions = (
definitions: readonly AutotileDefinition[] | undefined,
layers: readonly SceneTilemapLayer[],
remapStartTile: (
value: number,
definition: AutotileDefinition,
definitionId: number,
) => number,
): {
autotiles: AutotileDefinition[];
layers: SceneTilemapLayer[];
} => {
const idMap = new Map<number, number>();
const autotiles: AutotileDefinition[] = [];
for (const [index, definition] of (definitions ?? []).entries()) {
const startTile = remapStartTile(
definition.startTile,
definition,
index + 1,
);
if (!startTile) continue;
idMap.set(index + 1, autotiles.length + 1);
autotiles.push({ ...definition, startTile });
}
const nextLayers = layers.map((layer) => ({
...layer,
...(layer.autotiles
? {
autotiles: layer.autotiles.map((id) =>
id ? (idMap.get(id) ?? 0) : 0,
),
}
: {}),
}));
return { autotiles, layers: nextLayers };
};
export const pruneTilemapLayersTilesets = (
tilemap: SceneTilemapData,
): SceneTilemapData => {
const usedAutotileIds = new Set<number>();
for (const layer of tilemap.layers) {
for (const definitionId of layer.autotiles ?? []) {
if (definitionId > 0) usedAutotileIds.add(definitionId);
}
}
const usedTilesetIds = new Set<string>();
const tilesetLookup = buildSceneTilesetLookup(tilemap);
const { entries, entryByAbsoluteIndex } = tilesetLookup;
const remappedAutotiles = remapSceneAutotileDefinitions(
tilemap.autotiles,
tilemap.layers,
(startTile, definition, definitionId) => {
if (!usedAutotileIds.has(definitionId)) return 0;
return isSceneAutotileDefinitionValid(definition, tilesetLookup)
? startTile
: 0;
},
);
const autotileDefinitions = remappedAutotiles.autotiles;
const layersWithPrunedAutotiles = remappedAutotiles.layers;
const autotilesChanged =
autotileDefinitions.length !== (tilemap.autotiles?.length ?? 0) ||
layersWithPrunedAutotiles.some((layer, index) =>
layer.autotiles?.some(
(id, cellIndex) => id !== tilemap.layers[index]?.autotiles?.[cellIndex],
),
);
const usedTilesetIndexes = new Array<boolean>(entries.length).fill(false);
let invalidRefSeen = false;
const scanRefs = (values: readonly number[] | undefined) => {
Iif (!values) {
return;
}
for (let i = 0; i < values.length; i++) {
const value = values[i];
if (!value) {
Iif (value !== 0) {
invalidRefSeen = true;
}
continue;
}
const entry = entryByAbsoluteIndex[value - 1];
if (!entry) {
invalidRefSeen = true;
continue;
}
usedTilesetIds.add(entry.tilesetId);
usedTilesetIndexes[entry.tilesetIndex] = true;
}
};
// Find tilesets that are still being referenced.
for (const layer of layersWithPrunedAutotiles) {
scanRefs(layer.tiles);
}
scanRefs(autotileDefinitions.map((definition) => definition.startTile));
// Keep only tilesets that are still referenced
const seenTilesetIds = new Set<string>();
const tilesets: SceneTilemapData["tilesets"] = [];
const newOffsetByTilesetId = new Map<string, number>();
let nextOffset = 0;
let tilesetsChanged = false;
for (let index = 0; index < tilemap.tilesets.length; index++) {
const tileset = tilemap.tilesets[index];
const entry = entries[index];
const keep =
!!entry &&
usedTilesetIds.has(tileset.id) &&
!seenTilesetIds.has(tileset.id);
if (!keep) {
tilesetsChanged = true;
continue;
}
seenTilesetIds.add(tileset.id);
newOffsetByTilesetId.set(tileset.id, nextOffset);
tilesets.push(tileset);
if (tilesets.length - 1 !== index) {
tilesetsChanged = true;
}
nextOffset += entry.count;
}
if (tilesets.length !== tilemap.tilesets.length) {
tilesetsChanged = true;
}
// Map every original tileset index to the new offset for its tileset id
const newOffsetByTilesetIndex = new Array<number>(entries.length).fill(-1);
for (const entry of entries) {
const newOffset = newOffsetByTilesetId.get(entry.tilesetId);
if (newOffset !== undefined) {
newOffsetByTilesetIndex[entry.tilesetIndex] = newOffset;
}
}
let remapRequired = invalidRefSeen;
if (!remapRequired) {
for (let index = 0; index < entries.length; index++) {
const entry = entries[index];
if (
usedTilesetIndexes[index] &&
newOffsetByTilesetIndex[index] !== entry.offset
) {
remapRequired = true;
break;
}
}
}
if (!tilesetsChanged && !remapRequired && !autotilesChanged) {
return tilemap;
}
if (!remapRequired) {
return {
...tilemap,
tilesets,
...(tilemap.autotiles ? { autotiles: autotileDefinitions } : {}),
layers: layersWithPrunedAutotiles,
};
}
const remapRefs = (values: readonly number[]): number[] => {
const result = new Array<number>(values.length);
for (let i = 0; i < values.length; i++) {
const value = values[i];
if (!value) {
result[i] = 0;
continue;
}
const absoluteIndex = value - 1;
const entry = entryByAbsoluteIndex[absoluteIndex];
if (!entry) {
result[i] = 0;
continue;
}
const newOffset = newOffsetByTilesetIndex[entry.tilesetIndex];
result[i] =
newOffset >= 0 ? newOffset + (absoluteIndex - entry.offset) + 1 : 0;
}
return result;
};
return {
...tilemap,
tilesets,
...(tilemap.autotiles
? {
autotiles: autotileDefinitions.map((definition) => ({
...definition,
startTile: remapRefs([definition.startTile])[0] ?? 0,
})),
}
: {}),
layers: layersWithPrunedAutotiles.map((layer) => ({
...layer,
tiles: remapRefs(layer.tiles),
})),
};
};
export const isTilemapLayerCellTopmost = (
tilemap: SceneTilemapData,
layerIndex: number,
cellIndex: number,
): boolean => {
const layer = tilemap.layers[layerIndex];
if (!layer?.visible || !layer.tiles[cellIndex]) {
return false;
}
for (let index = layerIndex + 1; index < tilemap.layers.length; index++) {
const aboveLayer = tilemap.layers[index];
if (aboveLayer?.visible && aboveLayer.tiles[cellIndex]) {
return false;
}
}
return true;
};
export const normalizeTilemapLayersSize = ({
width: requestedWidth,
height: requestedHeight,
resizeAxis,
}: {
width: number;
height: number;
resizeAxis: "width" | "height";
}) => {
let width = Math.min(255, Math.max(20, Math.floor(requestedWidth)));
let height = Math.min(255, Math.max(18, Math.floor(requestedHeight)));
if (width * height > MAX_SCENE_TILE_COUNT) {
if (resizeAxis === "width") {
width = Math.max(20, Math.floor(MAX_SCENE_TILE_COUNT / height));
} else {
height = Math.max(18, Math.floor(MAX_SCENE_TILE_COUNT / width));
}
}
return { width, height };
};
|