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import { Loader } from "./loader.ts";
export class Resource<T> {
constructor(public hash: Uint8Array) { }
toString() {
return Array.from(this.hash)
.map(e => e.toString(16).padStart(2, "0"))
.join("")
}
}
export function read_res_table(buffer: Uint8Array, cb: (key: string, value: Uint8Array) => void) {
const view = new DataView(buffer.buffer)
let p = 0
while (p < view.byteLength) {
const key_len = view.getInt16(p, true)
p += 2
const value_len = view.getInt16(p, true)
p += 2
const key = String.fromCharCode(...buffer.slice(p, p + key_len))
p += key_len
const value = buffer.slice(p, p + value_len)
p += value_len
cb(key, value)
}
}
function get_vec3(b: Uint8Array): Vec3 {
const k = new DataView(b.buffer)
return {
x: k.getFloat32(0, true),
y: k.getFloat32(4, true),
z: k.getFloat32(8, true),
}
}
function get_aabb(b: Uint8Array): AABB {
return {
min: get_vec3(b.slice(0, 12)),
max: get_vec3(b.slice(12, 24))
}
}
const object_cache = new Map()
async function ob_cached<T>(r: Resource<T>, make: () => Promise<T>): Promise<T> {
const k = r.toString()
const l = object_cache.get(k)
if (l) return l
const m = await make()
object_cache.set(k, m)
return m
}
export async function get_respackentry(l: Loader, r: Resource<RespackEntry>): Promise<RespackEntry> {
return await ob_cached(r, async () => {
const buf = await l.download(r);
const o: RespackEntry = {}
read_res_table(buf, (key, value) => {
switch (key) {
case "c_spatial_index":
o.c_spatial_index = new Resource(value)
break
default:
}
});
return o
})
}
export async function get_spatialindex(l: Loader, r: Resource<SpatialIndex>): Promise<SpatialIndex> {
return await ob_cached(r, async () => {
const buf = await l.download(r);
const o: SpatialIndex = { child: [] }
read_res_table(buf, (key, value) => {
switch (key) {
case "prefab":
o.prefab = new Resource(value)
break
case "child":
o.child.push([
get_aabb(value.slice(0, 24)),
new Resource(value.slice(24, 56))
])
break
default:
}
});
return o
})
}
export async function get_prefab(l: Loader, r: Resource<Prefab>): Promise<Prefab> {
return await ob_cached(r, async () => {
const buf = await l.download(r);
const o: Prefab = { graphics: [] }
read_res_table(buf, (key, value) => {
let v, x = 0
switch (key) {
case "graphics":
o.graphics.push([undefined as unknown as Affine3, new Resource(value.slice(48, 80))])
break
case "transform":
v = new DataView(value.buffer.slice(0, 96))
o.transform = [
v.getFloat64((x++) * 8, true),
v.getFloat64((x++) * 8, true),
v.getFloat64((x++) * 8, true),
v.getFloat64((x++) * 8, true),
v.getFloat64((x++) * 8, true),
v.getFloat64((x++) * 8, true),
v.getFloat64((x++) * 8, true),
v.getFloat64((x++) * 8, true),
v.getFloat64((x++) * 8, true),
v.getFloat64((x++) * 8, true),
v.getFloat64((x++) * 8, true),
v.getFloat64((x++) * 8, true),
]
break
default:
}
});
return o
})
}
export async function get_graphics_part(l: Loader, r: Resource<GraphicsPart>): Promise<GraphicsPart> {
return await ob_cached(r, async () => {
return new GraphicsPart(await l.download(r))
})
}
export interface Vec3 { x: number, y: number, z: number }
export interface AABB { min: Vec3, max: Vec3 }
export interface Mat3 { x: Vec3, y: Vec3, z: Vec3 }
export type Affine3 = [number, number, number, number, number, number, number, number, number, number, number, number]
export interface SpatialIndex {
level?: number
prefab?: Resource<undefined>
child: [AABB, Resource<undefined>][]
}
export interface RespackEntry {
c_spatial_index?: Resource<SpatialIndex>
}
export interface Prefab {
transform?: Affine3,
graphics: [Affine3, Resource<GraphicsPart>][]
}
export class GraphicsPart {
commands: GraphicsCommand[] | undefined
constructor(public buffer: Uint8Array) { }
read(): GraphicsCommand[] {
if (this.commands) return this.commands
const out: GraphicsCommand[] = []
let p = 0
while (p < this.buffer.length) {
const step = this.buffer[p + 0]
const kind = this.buffer[p + 1]
p += 2
if (kind == 0) {
if (step == 0) out.push({ no_fill: true })
else if (step == 1) out.push({ fill: this.buffer[p + 0] })
else throw new Error("bbb");
} else if (kind == 1) {
if (step == 0) out.push({ no_stroke: true })
else if (step == 1) out.push({ stroke: this.buffer[p + 0] })
else throw new Error("ccc");
} else if (kind == 2) {
if (step == 4) out.push({ stroke_width: new DataView(this.buffer.buffer.slice(p, p + 4)).getFloat32(0) })
else throw new Error("ddd");
} else if (kind == 6) {
if (step == 12) out.push({ point: get_vec3(this.buffer.slice(p, p + 12)) })
else throw new Error("eee");
}
else throw new Error(`unknown gcmd ${kind}`);
p += step
}
this.commands = out
return out
}
}
export interface GraphicsCommand {
no_fill?: true,
fill?: number,
no_stroke?: true
stroke?: number
stroke_width?: number
point?: Vec3
}
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