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Activate dormant ants from spawn buffer in shader

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This commit is contained in:
Jared Miller 2026-03-11 20:56:25 -04:00
parent b8f49afcc4
commit aa3c94091b
Signed by: shmup
GPG key ID: 22B5C6D66A38B06C
1 changed files with 56 additions and 25 deletions
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37
src/shaders/antsCompute.frag
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@ -15,6 +15,7 @@ uniform sampler2D tWorld;
uniform sampler2D tPresence; uniform sampler2D tPresence;
uniform float uForagerRatio; uniform float uForagerRatio;
uniform sampler2D uMaterialProps; uniform sampler2D uMaterialProps;
uniform vec4 uAntSpawn;
const float ANT_CARRY_STRENGTH = 1.0; const float ANT_CARRY_STRENGTH = 1.0;
const float sampleDistance = 20.; const float sampleDistance = 20.;
@ -94,14 +95,43 @@ void main() {
int antIndex = int(vUv.y * float(texSize.y)) * texSize.x + int(vUv.x * float(texSize.x)); int antIndex = int(vUv.y * float(texSize.y)) * texSize.x + int(vUv.x * float(texSize.x));
if (pos == vec2(0)) { // init new ant if (pos == vec2(0)) { // init new ant
// only activate ants within the start count bool spawnRequested = (uAntSpawn.w > 0.5);
if (antIndex >= ANTS_START_COUNT) {
// dormant ant — output zeros and skip everything if (antIndex >= ANTS_START_COUNT && !spawnRequested) {
// dormant ant, no spawn request — skip
FragColor = vec4(0); FragColor = vec4(0);
FragColorExt = vec4(0); FragColorExt = vec4(0);
return; return;
} }
if (antIndex >= ANTS_START_COUNT && spawnRequested) {
// probabilistic activation: ~brushRadius ants per frame
float activationChance = uAntSpawn.z / float(ANT_BUDGET);
float roll = rand(vUv * 50000. + fract(uTime / 1000.));
if (roll > activationChance) {
// not selected this frame — stay dormant
FragColor = vec4(0);
FragColorExt = vec4(0);
return;
}
// activate at spawn position with scatter
float scatter = uAntSpawn.z / WORLD_SIZE;
float rngX = rand(vUv * 10000. + fract(uTime / 1000.));
float rngY = rand(vUv * 20000. + fract(uTime / 1000.) + 0.5);
pos = vec2(
uAntSpawn.x + (rngX - 0.5) * scatter,
uAntSpawn.y + (rngY - 0.5) * scatter
);
pos = clamp(pos, 0., 1.);
angle = rand(vUv * 42069.) * 2.0 * PI;
isCarrying = 0.;
storage = 0.;
personality = rand(vUv * 42069.);
cargoMaterialId = 0.;
pathIntDx = 0.;
pathIntDy = 0.;
} else {
// normal init for starting ants
#if VIEW_MODE_SIDE #if VIEW_MODE_SIDE
// spawn on sand surface: random X, scan down from top to find first non-air cell // spawn on sand surface: random X, scan down from top to find first non-air cell
float spawnX = rand(vUv * 10000.); float spawnX = rand(vUv * 10000.);
@ -127,6 +157,7 @@ void main() {
pathIntDx = 0.; pathIntDx = 0.;
pathIntDy = 0.; pathIntDy = 0.;
} }
}
// --- GRAVITY AND SURFACE CHECK --- // --- GRAVITY AND SURFACE CHECK ---
vec2 cellCenter = roundUvToCellCenter(pos); vec2 cellCenter = roundUvToCellCenter(pos);