rpuzonas/boids-playground
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improve performance by not trying to save doing distance checks

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This commit is contained in:
Rokas Puzonas 2023-07-21 22:54:34 +03:00
parent cabc63c2c2
commit 9b2e3cafeb
1 changed files with 3 additions and 7 deletions
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10
src/main.cpp
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@ -194,17 +194,13 @@ static void assign_local_boids(World *world, BoidsListNode *local_boids, uint16_
// Simplified from: float dot_threshold = Vector2DotProduct(dir, Vector2Rotate(dir, world->view_angle/2));
float dot_threshold = cosf(world->view_angle/2);
Vector2 offset = Vector2Subtract(boids[boid1].pos, boids[boid2].pos);
Vector2 offset = Vector2Subtract(boids[boid2].pos, boids[boid1].pos);
bool with_in_range = Vector2LengthSqr(offset) <= (world->view_radius * world->view_radius);
if (with_in_range) {
float dot = Vector2DotProduct(boids[boid1].dir, Vector2Normalize(offset));
if (-dot >= dot_threshold) {
boid_list_append_unique(&world->frame_arena, &local_boids[boid1], &local_boid_counts[boid1], boid2);
}
if (dot >= dot_threshold) {
boid_list_append_unique(&world->frame_arena, &local_boids[boid2], &local_boid_counts[boid2], boid1);
boid_list_append(&world->frame_arena, &local_boids[boid1], &local_boid_counts[boid1], boid2);
}
}
}
@ -612,7 +608,7 @@ int main() {
world_init(&g_world, screen_width, screen_height);
float border = g_world.collision_avoidance_distance;
for (int i = 0; i < 20000; i++) {
for (int i = 0; i < 30000; i++) {
Boid boid;
boid_rand_init(&g_world, &boid, border);
g_world.boids.push_back(boid);