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Update leenkx/Sources/iron/object/ParticleSystem.hx

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LeenkxTeam
2025-09-24 01:50:03 +00:00
parent 6af1ef2df1
commit a72edc6203
1 changed files with 164 additions and 13 deletions
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177
leenkx/Sources/iron/object/ParticleSystem.hx
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@ -8,6 +8,8 @@ import kha.arrays.Float32Array;
import iron.data.Data;
import iron.data.ParticleData;
import iron.data.SceneFormat;
import iron.data.Geometry;
import iron.data.MeshData;
import iron.system.Time;
import iron.math.Mat4;
import iron.math.Quat;
@ -17,6 +19,7 @@ import iron.math.Vec4;
class ParticleSystem {
public var data: ParticleData;
public var speed = 1.0;
public var dynamicEmitter: Bool = true;
var currentSpeed = 0.0;
var particles: Array<Particle>;
var ready: Bool;
@ -52,6 +55,12 @@ class ParticleSystem {
var random = 0.0;
var tmpV4 = new Vec4();
var instancedData: Float32Array = null;
var lastSpawnedCount: Int = 0;
var hasUniqueGeom: Bool = false;
public function new(sceneName: String, pref: TParticleReference) {
seed = pref.seed;
currentSpeed = speed;
@ -62,6 +71,11 @@ class ParticleSystem {
Data.getParticle(sceneName, pref.particle, function(b: ParticleData) {
data = b;
r = data.raw;
if (r.dynamic_emitter != null){
dynamicEmitter = r.dynamic_emitter;
} else {
dynamicEmitter = true;
}
if (Scene.active.raw.gravity != null) {
gx = Scene.active.raw.gravity[0] * r.weight_gravity;
gy = Scene.active.raw.gravity[1] * r.weight_gravity;
@ -98,6 +112,8 @@ class ParticleSystem {
lap = 0;
lapTime = 0;
speed = currentSpeed;
lastSpawnedCount = 0;
instancedData = null;
}
public function pause() {
@ -130,8 +146,13 @@ class ParticleSystem {
// Copy owner world transform but discard scale
owner.transform.world.decompose(ownerLoc, ownerRot, ownerScl);
object.transform.loc = ownerLoc;
object.transform.rot = ownerRot;
if (dynamicEmitter) {
object.transform.loc.x = 0; object.transform.loc.y = 0; object.transform.loc.z = 0;
object.transform.rot = new Quat();
} else {
object.transform.loc = ownerLoc;
object.transform.rot = ownerRot;
}
// Set particle size per particle system
object.transform.scale = new Vec4(r.particle_size, r.particle_size, r.particle_size, 1);
@ -158,13 +179,18 @@ class ParticleSystem {
if (lap > prevLap && !r.loop) {
end();
}
if (lap > prevLap && r.loop) {
lastSpawnedCount = 0;
}
updateGpu(object, owner);
}
public function getData(): Mat4 {
var hair = r.type == 1;
m._00 = animtime;
// Store loop flag in the sign: positive -> loop, negative -> no loop
m._00 = r.loop ? animtime : -animtime;
m._01 = hair ? 1 / particles.length : spawnRate;
m._02 = hair ? 1 : lifetime;
m._03 = particles.length;
@ -187,17 +213,26 @@ class ParticleSystem {
return r.size_random;
}
public function getRandom(): FastFloat {
public inline function getRandom(): FastFloat {
return random;
}
public function getSize(): FastFloat {
public inline function getSize(): FastFloat {
return r.particle_size;
}
function updateGpu(object: MeshObject, owner: MeshObject) {
if (!object.data.geom.instanced) setupGeomGpu(object, owner);
// GPU particles transform is attached to owner object
if (dynamicEmitter) {
if (!hasUniqueGeom) ensureUniqueGeom(object);
var needSetup = instancedData == null || object.data.geom.instancedVB == null;
if (needSetup) setupGeomGpuDynamic(object, owner);
updateSpawnedInstances(object, owner);
}
else {
if (!hasUniqueGeom) ensureUniqueGeom(object);
if (!object.data.geom.instanced) setupGeomGpu(object, owner);
}
// GPU particles transform is attached to owner object in static mode
}
function setupGeomGpu(object: MeshObject, owner: MeshObject) {
@ -258,18 +293,134 @@ class ParticleSystem {
object.data.geom.setupInstanced(instancedData, 1, Usage.StaticUsage);
}
function fhash(n: Int): Float {
var s = n + 1.0;
s *= 9301.0 % s;
s = (s * 9301.0 + 49297.0) % 233280.0;
return s / 233280.0;
// allocate instanced VB once for this object
function setupGeomGpuDynamic(object: MeshObject, owner: MeshObject) {
if (instancedData == null) instancedData = new Float32Array(particles.length * 3);
lastSpawnedCount = 0;
// Create instanced VB once if missing (seed with our instancedData)
if (object.data.geom.instancedVB == null) {
object.data.geom.setupInstanced(instancedData, 1, Usage.DynamicUsage);
}
}
function ensureUniqueGeom(object: MeshObject) {
if (hasUniqueGeom) return;
var newData: MeshData = null;
new MeshData(object.data.raw, function(dat: MeshData) {
dat.scalePos = object.data.scalePos;
dat.scaleTex = object.data.scaleTex;
dat.format = object.data.format;
newData = dat;
});
if (newData != null) object.setData(newData);
hasUniqueGeom = true;
}
function updateSpawnedInstances(object: MeshObject, owner: MeshObject) {
if (instancedData == null) return;
var targetCount = count;
if (targetCount > particles.length) targetCount = particles.length;
if (targetCount <= lastSpawnedCount) return;
var normFactor = 1 / 32767;
var scalePosOwner = owner.data.scalePos;
var scalePosParticle = object.data.scalePos;
var particleSize = r.particle_size;
var base = 1.0 / (particleSize * scalePosParticle);
switch (r.emit_from) {
case 0: // Vert
var pa = owner.data.geom.positions;
var osx = owner.transform.scale.x;
var osy = owner.transform.scale.y;
var osz = owner.transform.scale.z;
var pCount = Std.int(pa.values.length / pa.size);
for (idx in lastSpawnedCount...targetCount) {
var j = Std.int(fhash(idx) * pCount);
var lx = pa.values[j * pa.size ] * normFactor * scalePosOwner * osx;
var ly = pa.values[j * pa.size + 1] * normFactor * scalePosOwner * osy;
var lz = pa.values[j * pa.size + 2] * normFactor * scalePosOwner * osz;
tmpV4.x = lx; tmpV4.y = ly; tmpV4.z = lz; tmpV4.w = 1;
tmpV4.applyQuat(ownerRot);
var o = idx * 3;
instancedData.set(o , (tmpV4.x + ownerLoc.x) * base);
instancedData.set(o + 1, (tmpV4.y + ownerLoc.y) * base);
instancedData.set(o + 2, (tmpV4.z + ownerLoc.z) * base);
}
case 1: // Face
var positions = owner.data.geom.positions.values;
var osx1 = owner.transform.scale.x;
var osy1 = owner.transform.scale.y;
var osz1 = owner.transform.scale.z;
for (idx in lastSpawnedCount...targetCount) {
var ia = owner.data.geom.indices[Std.random(owner.data.geom.indices.length)];
var faceIndex = Std.random(Std.int(ia.length / 3));
var i0 = ia[faceIndex * 3 + 0];
var i1 = ia[faceIndex * 3 + 1];
var i2 = ia[faceIndex * 3 + 2];
var v0x = positions[i0 * 4 ], v0y = positions[i0 * 4 + 1], v0z = positions[i0 * 4 + 2];
var v1x = positions[i1 * 4 ], v1y = positions[i1 * 4 + 1], v1z = positions[i1 * 4 + 2];
var v2x = positions[i2 * 4 ], v2y = positions[i2 * 4 + 1], v2z = positions[i2 * 4 + 2];
var rx = Math.random(); var ry = Math.random(); if (rx + ry > 1) { rx = 1 - rx; ry = 1 - ry; }
var pxs = v0x + rx * (v1x - v0x) + ry * (v2x - v0x);
var pys = v0y + rx * (v1y - v0y) + ry * (v2y - v0y);
var pzs = v0z + rx * (v1z - v0z) + ry * (v2z - v0z);
var px = pxs * normFactor * scalePosOwner * osx1;
var py = pys * normFactor * scalePosOwner * osy1;
var pz = pzs * normFactor * scalePosOwner * osz1;
tmpV4.x = px; tmpV4.y = py; tmpV4.z = pz; tmpV4.w = 1;
tmpV4.applyQuat(ownerRot);
var o1 = idx * 3;
instancedData.set(o1 , (tmpV4.x + ownerLoc.x) * base);
instancedData.set(o1 + 1, (tmpV4.y + ownerLoc.y) * base);
instancedData.set(o1 + 2, (tmpV4.z + ownerLoc.z) * base);
}
case 2: // Volume
var dim = object.transform.dim;
for (idx in lastSpawnedCount...targetCount) {
tmpV4.x = (Math.random() * 2.0 - 1.0) * (dim.x * 0.5);
tmpV4.y = (Math.random() * 2.0 - 1.0) * (dim.y * 0.5);
tmpV4.z = (Math.random() * 2.0 - 1.0) * (dim.z * 0.5);
tmpV4.w = 1;
tmpV4.applyQuat(ownerRot);
var o2 = idx * 3;
instancedData.set(o2 , (tmpV4.x + ownerLoc.x) * base);
instancedData.set(o2 + 1, (tmpV4.y + ownerLoc.y) * base);
instancedData.set(o2 + 2, (tmpV4.z + ownerLoc.z) * base);
}
}
// Upload full active range [0..targetCount) to this object's instanced VB
var geom = object.data.geom;
if (geom.instancedVB == null) {
geom.setupInstanced(instancedData, 1, Usage.DynamicUsage);
}
var vb = geom.instancedVB.lock();
var totalFloats = targetCount * 3; // xyz per instance
var i = 0;
while (i < totalFloats) {
vb.setFloat32(i * 4, instancedData[i]);
i++;
}
geom.instancedVB.unlock();
geom.instanceCount = targetCount;
lastSpawnedCount = targetCount;
}
inline function fhash(n: Int): Float {
var s = n + 1.0;
s *= 9301.0 % s;
s = (s * 9301.0 + 49297.0) % 233280.0;
return s / 233280.0;
}
public function remove() {}
/**
Generates a random point in the triangle with vertex positions abc.
Please note that the given position vectors are changed in-place by this
function and can be considered garbage afterwards, so make sure to clone
them first if needed.