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simulation: neighbour based iteration strategy

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Instead of randomly picking two cells, randomly pick the first then
choose a neighbour.  Changes are more local and thus we should see
clearer fluid movement instead of the chaos from before.
This commit is contained in:
Aryadev Chavali
2026-03-18 17:29:09 +00:00
parent f784cf13e6
commit 5679a80c3f
1 changed files with 53 additions and 3 deletions
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56
src/simulation.c
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@@ -42,11 +42,61 @@ static struct ProgramConcat *a_b_concat = NULL;
void simulation_iterate(simulation_t *sim)
{
u64 a = 0, b = 0;
while (a == b)
// Strategy 1: Pick two random cells
// while (a == b)
// {
// a = rand() % NUM_PROGRAMS;
// b = rand() % NUM_PROGRAMS;
// }
// Strategy 2: Pick a random cell, then iterate on all neighbours
a = rand() % NUM_PROGRAMS;
u64 a_x = a % SIMULATION_ROW_SIZE;
u64 a_y = a / SIMULATION_ROW_SIZE;
bool valid_dir[4] = {
a_x > 0,
a_x != (SIMULATION_ROW_SIZE - 1),
a_y > 0,
a_y < (SIMULATION_ROW_SIZE - 1),
};
u64 neighbours[8] = {0};
u64 size = 0;
if (valid_dir[0])
{
a = rand() % NUM_PROGRAMS;
b = rand() % NUM_PROGRAMS;
neighbours[size++] = a - 1;
if (valid_dir[2])
{
neighbours[size++] = a - SIMULATION_ROW_SIZE - 1;
}
if (valid_dir[3])
{
neighbours[size++] = a + SIMULATION_ROW_SIZE - 1;
}
}
if (valid_dir[1])
{
neighbours[size++] = a + 1;
if (valid_dir[2])
{
neighbours[size++] = a - SIMULATION_ROW_SIZE + 1;
}
if (valid_dir[3])
{
neighbours[size++] = a + SIMULATION_ROW_SIZE + 1;
}
}
if (valid_dir[2])
{
neighbours[size++] = a - SIMULATION_ROW_SIZE;
}
if (valid_dir[3])
{
neighbours[size++] = a + SIMULATION_ROW_SIZE;
}
b = neighbours[rand() % size];
// Perform the reaction
if (!a_b_concat)