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import { indexedImageTo2bppSpriteData } from "shared/lib/sprites/spriteData";
import {
animationMapBySpriteType,
toEngineOrder,
} from "shared/lib/sprites/helpers";
import { IndexedImage } from "shared/lib/tiles/indexedImage";
import { assetFilename } from "shared/lib/helpers/assets";
import { optimiseTiles } from "lib/sprites/readSpriteData";
import { ReferencedSprite } from "./precompile/determineUsedAssets";
import {
ColorModeSetting,
ObjPalette,
Sprite,
SpriteModeSetting,
} from "shared/lib/resources/types";
import {
spriteTileAllocationColorOnly,
spriteTileAllocationDefault,
} from "lib/compiler/tileAllocation";
const S_PALETTE = 0x10;
const S_FLIPX = 0x20;
const S_FLIPY = 0x40;
const S_PRIORITY = 0x80;
const S_GBC_PALETTE_MASK = 0x7;
const S_VRAM2 = 0x8;
interface AnimationOffset {
start: number;
end: number;
}
export type PrecompiledSpriteSheetData = Sprite & {
vramData: [number[], number[]];
tiles: IndexedImage[];
metasprites: SpriteTileData[][];
animationOffsets: AnimationOffset[];
metaspritesOrder: number[];
colorMode: ColorModeSetting;
};
interface SpriteTileData {
tile: number;
x: number;
y: number;
props: number;
}
const makeProps = (
objPalette: ObjPalette,
paletteIndex: number,
flipX: boolean,
flipY: boolean,
priority: boolean,
inVRAM2: boolean,
): number => {
return (
(objPalette === "OBP1" ? S_PALETTE : 0) +
(flipX ? S_FLIPX : 0) +
(flipY ? S_FLIPY : 0) +
(priority ? S_PRIORITY : 0) +
(paletteIndex & S_GBC_PALETTE_MASK) +
(inVRAM2 ? S_VRAM2 : 0)
);
};
export const compileSprite = async (
spriteSheet: ReferencedSprite,
cgbOnly: boolean,
projectRoot: string,
defaultSpriteMode: SpriteModeSetting,
): Promise<PrecompiledSpriteSheetData> => {
const filename = assetFilename(projectRoot, "sprites", spriteSheet);
const spriteMode: SpriteModeSetting =
spriteSheet.spriteMode ?? defaultSpriteMode ?? "8x16";
const tileAllocationStrategy = cgbOnly
? spriteTileAllocationColorOnly
: spriteTileAllocationDefault;
const metasprites = spriteSheet.states
.map((state) => state.animations)
.flat()
.map((animation) => {
return animation.frames.map((frame) => frame.tiles);
})
.flat();
const { tiles, lookup } = await optimiseTiles(
filename,
spriteSheet.canvasWidth,
spriteSheet.canvasHeight,
metasprites,
spriteMode,
);
const fixedXOffset = spriteSheet.canvasOriginX - 8;
const fixedYOffset =
(spriteMode === "8x16" ? 0 : -8) + spriteSheet.canvasOriginY - 8;
const animationDefs: SpriteTileData[][][] = spriteSheet.states
.map((state) =>
toEngineOrder(
animationMapBySpriteType(
state.animations,
state.animationType,
state.flipLeft,
(animation, flip) => {
Iif (!animation) {
return [];
}
return animation.frames.map((frame) => {
let currentX = fixedXOffset;
let currentY = fixedYOffset;
return [...frame.tiles]
.reverse()
.map((tile) => {
const optimisedTile = lookup[tile.id];
Iif (!optimisedTile) {
return null;
}
const { tileIndex, inVRAM2 } = tileAllocationStrategy(
optimisedTile.tile,
tiles.length,
spriteMode,
);
Iif (flip) {
const data: SpriteTileData = {
tile: tileIndex,
x:
(spriteSheet.canvasWidth > 8 ? 8 : 0) -
tile.x -
currentX,
y: -tile.y - currentY,
props: makeProps(
tile.objPalette,
tile.paletteIndex,
!optimisedTile.flipX,
optimisedTile.flipY,
tile.priority,
inVRAM2,
),
};
currentX = (spriteSheet.canvasWidth > 8 ? 8 : 0) - tile.x;
currentY = -tile.y;
return data;
}
const data: SpriteTileData = {
tile: tileIndex,
x: tile.x - currentX,
y: -tile.y - currentY,
props: makeProps(
tile.objPalette,
tile.paletteIndex,
optimisedTile.flipX,
optimisedTile.flipY,
tile.priority,
inVRAM2,
),
};
currentX = tile.x;
currentY = -tile.y;
return data;
})
.filter((tile) => tile) as SpriteTileData[];
});
},
),
),
)
.flat();
// const uniqFrames: SpriteTileData[][] = [];
const uniqFramesLookup: Record<string, number> = {};
const uniqFrames: SpriteTileData[][] = [];
const uniqMap = animationDefs.map((animationDef) => {
return animationDef.map((frame) => {
const key = JSON.stringify(frame); // Any hash function can work here
if (uniqFramesLookup[key] === undefined) {
uniqFramesLookup[key] = uniqFrames.length;
uniqFrames.push(frame);
}
return uniqFramesLookup[key];
});
});
const orderedFrames: number[] = [];
const animationOffsets = uniqMap.map((uniqIndexes) => {
let start = 0;
const matchIndex = firstIndexOfMatch(orderedFrames, uniqIndexes);
if (matchIndex > -1) {
start = matchIndex;
} else {
start = orderedFrames.length;
orderedFrames.push(...uniqIndexes);
}
return {
start,
end: start + Math.max(0, uniqIndexes.length - 1),
};
});
const vramData: [number[], number[]] = [[], []];
// Split tiles into VRAM banks based on allocation strategy
tiles.map(indexedImageTo2bppSpriteData).forEach((tile, i) => {
const { inVRAM2 } = tileAllocationStrategy(i, tiles.length, spriteMode);
vramData[inVRAM2 ? 1 : 0].push(...tile);
});
const precompiled: PrecompiledSpriteSheetData = {
...spriteSheet,
vramData,
tiles,
metasprites: uniqFrames,
animationOffsets,
metaspritesOrder: orderedFrames,
};
return precompiled;
};
const compileSprites = async (
spriteSheets: ReferencedSprite[],
projectRoot: string,
defaultSpriteMode: SpriteModeSetting,
): Promise<{
spritesData: PrecompiledSpriteSheetData[];
statesOrder: string[];
stateReferences: string[];
}> => {
const spritesData = await promiseLimit(
10,
spriteSheets.map(
(spriteSheet) => () =>
compileSprite(
spriteSheet,
spriteSheet.colorMode === "color",
projectRoot,
defaultSpriteMode,
),
),
);
const stateNames = spritesData
.map((sprite) => sprite.states)
.flat()
.map((state) => state.name)
.filter((name) => name.length > 0);
const stateCounts = stateNames.reduce(
(memo, name) => {
name in memo ? (memo[name] += 1) : (memo[name] = 1);
return memo;
},
{} as Record<string, number>,
);
const statesOrder = Object.keys(stateCounts).sort((a, b) => {
if (stateCounts[a] === stateCounts[b]) {
return 0;
}
return stateCounts[a] < stateCounts[b] ? 1 : -1;
});
statesOrder.unshift("");
// Build reference names for states
const stateReferences: string[] = [];
statesOrder.forEach((name) => {
const refName =
(name || "Default")
.replace(/ /g, "_")
.replace(/[^a-zA-Z0-9_]/g, "")
.toUpperCase() || "S";
let insertName = `STATE_${refName}`;
let insNum = 1;
while (stateReferences.includes(insertName)) {
insertName = `STATE_${refName}_${insNum++}`;
}
stateReferences.push(insertName);
});
return { spritesData, statesOrder, stateReferences };
};
const firstIndexOfMatch = <T>(arr: T[], pattern: T[]): number => {
for (
let i = 0;
i < arr.length && i < arr.length - (pattern.length - 1);
i++
) {
let found = true;
for (let j = 0; j < pattern.length; j++) {
Iif (arr[i + j] !== pattern[j]) {
found = false;
break;
}
}
Eif (found) {
return i;
}
}
return -1;
};
export default compileSprites;
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