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don't merge walls with different collision directions

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This commit is contained in:
jacob 2025-05-22 15:36:19 -05:00
parent 6c884a2228
commit b0ffb143f2
6 changed files with 66 additions and 83 deletions
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4
src/phys.c
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@ -98,8 +98,8 @@ void phys_create_and_update_contacts(struct phys_step_ctx *ctx, f32 elapsed_dt,
b32 create_constraint = collider_res.num_points > 0;
if (create_constraint) {
struct v2 normal = collider_res.normal;
struct v2 dir0 = e0->test_dir;
struct v2 dir1 = e1->test_dir;
struct v2 dir0 = e0->collision_dir;
struct v2 dir1 = e1->collision_dir;
f32 threshold = 0.5;
if (create_constraint && !v2_is_zero(dir0)) {
create_constraint = v2_dot(dir0, normal) > threshold;

5
src/rand.c
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@ -41,6 +41,11 @@ u64 rand_u64_from_seed(u64 seed)
return seed;
}
u64 rand_u64_from_seeds(u64 seed_a, u64 seed_b)
{
return rand_u64_from_seed((seed_a * 3) + seed_b);
}
f64 rand_f64_from_seed(u64 seed, f64 range_start, f64 range_end)
{
return range_start + (range_end - range_start) * ((f64)(rand_u64_from_seed(seed) % F64_RAND_MAX) / (f64)F64_RAND_MAX);

1
src/rand.h
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@ -11,6 +11,7 @@ u64 rand_u64_from_state(struct rand_state *state);
f64 rand_f64_from_state(struct rand_state *state, f64 range_start, f64 range_end);
u64 rand_u64_from_seed(u64 seed);
u64 rand_u64_from_seeds(u64 seed_a, u64 seed_b);
f64 rand_f64_from_seed(u64 seed, f64 range_start, f64 range_end);
#endif

24
src/sim_ent.h
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@ -73,28 +73,6 @@ enum sim_ent_prop {
struct sim_ent {
struct sim_snapshot *ss;
struct v2 test_dir;
/* ====================================================================== */
/* Metadata */
@ -191,7 +169,6 @@ struct sim_ent {
u8 tile_chunk_tiles[SIM_TILES_PER_CHUNK_SQRT * SIM_TILES_PER_CHUNK_SQRT];
struct v2i32 tile_chunk_index;
/* ====================================================================== */
/* Client */
@ -219,6 +196,7 @@ struct sim_ent {
/* ====================================================================== */
/* Collider */
struct v2 collision_dir; /* If set, then only collisions coming from this direction will generate contacts (used for walls to prevent ghost collisions) */
struct collider_shape local_collider;
#if COLLIDER_DEBUG

103
src/sim_step.c
View File

@ -461,14 +461,13 @@ INTERNAL void test_generate_walls(struct sim_snapshot *world)
for (i32 tile_y = 0; tile_y < y_iterations; ++tile_y) {
i32 wall_start = -1;
i32 wall_end = -1;
i32 last_wall_dir = -1;
for (i32 tile_x = 0; tile_x < x_iterations; ++tile_x) {
i32 wall_dir = -1;
for (i32 tile_x = 0; tile_x < x_iterations; ++tile_x) {
i32 desired_wall_dir = -1;
enum sim_tile_kind tile = SIM_TILE_KIND_NONE;
if (tile_x < SIM_TILES_PER_CHUNK_SQRT && tile_y < SIM_TILES_PER_CHUNK_SQRT) {
tile = sim_get_chunk_tile(chunk, V2I32(tile_x, tile_y));
}
b32 should_have_top_wall = false;
if (tile_x < SIM_TILES_PER_CHUNK_SQRT) {
enum sim_tile_kind top_tile = SIM_TILE_KIND_NONE;
if (tile_y == 0) {
@ -481,29 +480,25 @@ INTERNAL void test_generate_walls(struct sim_snapshot *world)
}
if (tile == SIM_TILE_KIND_WALL) {
/* Process wall tile */
should_have_top_wall = top_tile != SIM_TILE_KIND_WALL;
wall_dir = 0;
if (top_tile != SIM_TILE_KIND_WALL) {
desired_wall_dir = 0;
}
} else {
/* Process non-wall tile */
should_have_top_wall = top_tile == SIM_TILE_KIND_WALL;
wall_dir = 2;
if (top_tile == SIM_TILE_KIND_WALL) {
desired_wall_dir = 2;
}
}
if (should_have_top_wall) {
if (wall_start < 0) {
/* Start wall */
wall_start = tile_x;
}
/* Extend wall */
wall_end = tile_x + 1;
last_wall_dir = wall_dir;
} else if (wall_end >= 0) {
/* Stop wall */
if (wall_dir >= 0 && desired_wall_dir != wall_dir) {
struct v2i32 start = sim_world_tile_index_from_local_tile_index(chunk_index, V2I32(wall_start, tile_y));
struct v2i32 end = sim_world_tile_index_from_local_tile_index(chunk_index, V2I32(wall_end, tile_y));
struct wall_node *node = NULL;
if (wall_start == 0) {
u64 start_hash = rand_u64_from_seed(*(u64 *)&start);
start_hash = rand_u64_from_seeds(start_hash, wall_dir);
struct dict_entry *entry = dict_get_entry(&horizontal_ends_dict, start_hash);
if (entry) {
/* Existing wall exists accross chunk boundary */
@ -515,17 +510,29 @@ INTERNAL void test_generate_walls(struct sim_snapshot *world)
node = arena_push(scratch.arena, struct wall_node);
node->start = start;
node->next = first_wall;
node->wall_dir = last_wall_dir;
node->wall_dir = wall_dir;
first_wall = node;
}
node->end = end;
if (wall_end == SIM_TILES_PER_CHUNK_SQRT) {
u64 end_hash = rand_u64_from_seed(*(u64 *)&end);
end_hash = rand_u64_from_seeds(end_hash, wall_dir);
dict_set(scratch.arena, &horizontal_ends_dict, end_hash, node);
}
wall_start = -1;
wall_end = -1;
last_wall_dir = -1;
wall_dir = -1;
}
/* Start / extend wall */
if (desired_wall_dir >= 0) {
if (wall_dir != desired_wall_dir) {
/* Start wall */
wall_start = tile_x;
}
/* Extend wall */
wall_end = tile_x + 1;
wall_dir = desired_wall_dir;
}
}
}
@ -543,15 +550,14 @@ INTERNAL void test_generate_walls(struct sim_snapshot *world)
for (i32 tile_x = 0; tile_x < x_iterations; ++tile_x) {
i32 wall_start = -1;
i32 wall_end = -1;
i32 last_wall_dir = -1;
for (i32 tile_y = 0; tile_y < y_iterations; ++tile_y) {
i32 wall_dir = -1;
for (i32 tile_y = 0; tile_y < y_iterations; ++tile_y) {
i32 desired_wall_dir = -1;
enum sim_tile_kind tile = SIM_TILE_KIND_NONE;
if (tile_x < SIM_TILES_PER_CHUNK_SQRT && tile_y < SIM_TILES_PER_CHUNK_SQRT) {
tile = sim_get_chunk_tile(chunk, V2I32(tile_x, tile_y));
}
b32 should_have_left_wall = false;
if (tile_y < SIM_TILES_PER_CHUNK_SQRT) {
enum sim_tile_kind left_tile = SIM_TILE_KIND_NONE;
if (tile_x == 0) {
@ -564,29 +570,25 @@ INTERNAL void test_generate_walls(struct sim_snapshot *world)
}
if (tile == SIM_TILE_KIND_WALL) {
/* Process wall tile */
should_have_left_wall = left_tile != SIM_TILE_KIND_WALL;
wall_dir = 3;
if (left_tile != SIM_TILE_KIND_WALL) {
desired_wall_dir = 3;
}
} else {
/* Process non-wall tile */
should_have_left_wall = left_tile == SIM_TILE_KIND_WALL;
wall_dir = 1;
if (left_tile == SIM_TILE_KIND_WALL) {
desired_wall_dir = 1;
}
}
if (should_have_left_wall) {
if (wall_start < 0) {
/* Start wall */
wall_start = tile_y;
}
/* Extend wall */
wall_end = tile_y + 1;
last_wall_dir = wall_dir;
} else if (wall_end >= 0) {
/* Stop wall */
if (wall_dir >= 0 && desired_wall_dir != wall_dir) {
struct v2i32 start = sim_world_tile_index_from_local_tile_index(chunk_index, V2I32(tile_x, wall_start));
struct v2i32 end = sim_world_tile_index_from_local_tile_index(chunk_index, V2I32(tile_x, wall_end));
struct wall_node *node = NULL;
if (wall_start == 0) {
u64 start_hash = rand_u64_from_seed(*(u64 *)&start);
start_hash = rand_u64_from_seeds(start_hash, wall_dir);
struct dict_entry *entry = dict_get_entry(&vertical_ends_dict, start_hash);
if (entry) {
/* Existing wall exists accross chunk boundary */
@ -598,17 +600,29 @@ INTERNAL void test_generate_walls(struct sim_snapshot *world)
node = arena_push(scratch.arena, struct wall_node);
node->start = start;
node->next = first_wall;
node->wall_dir = last_wall_dir;
node->wall_dir = wall_dir;
first_wall = node;
}
node->end = end;
if (wall_end == SIM_TILES_PER_CHUNK_SQRT) {
u64 end_hash = rand_u64_from_seed(*(u64 *)&end);
end_hash = rand_u64_from_seeds(end_hash, wall_dir);
dict_set(scratch.arena, &vertical_ends_dict, end_hash, node);
}
wall_start = -1;
wall_end = -1;
last_wall_dir = -1;
wall_dir = -1;
}
/* Start / extend wall */
if (desired_wall_dir >= 0) {
if (wall_dir != desired_wall_dir) {
/* Start wall */
wall_start = tile_y;
}
/* Extend wall */
wall_end = tile_y + 1;
wall_dir = desired_wall_dir;
}
}
}
@ -629,24 +643,9 @@ INTERNAL void test_generate_walls(struct sim_snapshot *world)
wall_ent->local_collider.count = 2;
wall_ent->local_collider.points[1] = v2_sub(end, start);
switch (node->wall_dir) {
case 0:
{
wall_ent->test_dir = V2(0, -1);
} break;
case 1:
{
wall_ent->test_dir = V2(1, 0);
} break;
case 2:
{
wall_ent->test_dir = V2(0, 1);
} break;
case 3:
{
wall_ent->test_dir = V2(-1, 0);
} break;
}
LOCAL_PERSIST struct v2 dirs[4] = { V2(0, -1), V2(1, 0), V2(0, 1), V2(-1, 0) };
ASSERT(node->wall_dir >= 0 && (u32)node->wall_dir < ARRAY_COUNT(dirs));
wall_ent->collision_dir = dirs[node->wall_dir];
sim_ent_activate(wall_ent, world->tick);
}

2
src/user.c
View File

@ -413,7 +413,7 @@ INTERNAL struct string get_ent_debug_text(struct arena *arena, struct sim_ent *e
res.len += string_format(arena, LIT("angular velocity: %F\n"), FMT_FLOAT(angular_velocity)).len;
/* Test */
res.len += string_format(arena, LIT("test_dir: (%F, %F)\n"), FMT_FLOAT(ent->test_dir.x), FMT_FLOAT(ent->test_dir.y)).len;
res.len += string_format(arena, LIT("collision dir: (%F, %F)\n"), FMT_FLOAT(ent->collision_dir.x), FMT_FLOAT(ent->collision_dir.y)).len;
/* Children */
if (!sim_ent_id_is_nil(ent->first) || !sim_ent_id_is_nil(ent->last)) {