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REAL A* pathfinding, works!! Runs every frame though

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main
Cameron Murphy Reikes 2 years ago
parent 1f8b3c5d0e
commit 13dbe9ef27
4 changed files with 2089 additions and 89 deletions
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16
assets/newsmalllevel.json
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@ -44,13 +44,13 @@
},
{
"data":[0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 60, 60, 60, 60, 60, 60, 0,
60, 0, 0, 60, 0, 0, 0, 0, 0,
60, 0, 0, 60, 0, 0, 0, 0, 0,
0, 0, 0, 60, 60, 0, 0, 0, 0,
0, 0, 0, 60, 60, 60, 60, 60, 60,
0, 0, 60, 60, 0, 0, 0, 0, 0,
0, 0, 0, 60, 0, 0, 0, 0, 0,
0, 0, 0, 60, 0, 0, 0, 0, 0,
0, 0, 0, 60, 0, 0, 0, 0, 0,
0, 0, 0, 60, 0, 0, 0, 0, 0,
0, 0, 60, 60, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 60, 60, 60, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0],
"height":9,
"id":4,
@ -75,8 +75,8 @@
"rotation":0,
"visible":true,
"width":32,
"x":41.7954545454561,
"y":110.393939393944
"x":46.4621212121228,
"y":115.727272727277
},
{
"class":"",

2
buff.h
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@ -19,5 +19,3 @@
#define BUFF_REMOVE_BACK(buff_ptr) {assert( (buff_ptr)->cur_index > 0); (buff_ptr)->cur_index--;}
#define BUFF_REMOVE_FRONT(buff_ptr) {if((buff_ptr)->cur_index > 0) {for(int i = 0; i < (buff_ptr)->cur_index - 1; i++) { (buff_ptr)->data[i] = (buff_ptr)->data[i+1]; }; (buff_ptr)->cur_index--;}}
#define BUFF_CLEAR(buff_ptr) {memset((buff_ptr), 0, sizeof(*(buff_ptr))); ((buff_ptr)->cur_index = 0);}

225
main.c
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@ -23,6 +23,8 @@
#include "stb_image.h"
#define STB_TRUETYPE_IMPLEMENTATION
#include "stb_truetype.h"
#define STB_DS_IMPLEMENTATION
#include "stb_ds.h"
#include "HandmadeMath.h"
#define DR_WAV_IMPLEMENTATION
#include "dr_wav.h"
@ -346,6 +348,11 @@ AABB entity_sword_aabb(Entity *e, float width, float height)
}
}
float max_coord(Vec2 v)
{
return v.x > v.y ? v.x : v.y;
}
// aabb advice by iRadEntertainment
Vec2 entity_aabb_size(Entity *e)
{
@ -922,7 +929,11 @@ void init(void)
{
.usage = SG_USAGE_STREAM,
//.data = SG_RANGE(vertices),
.size = 1024*900,
#ifdef DEVTOOLS
.size = 1024*2500,
#else
.size = 1024*700,
#endif
.label = "quad-vertices"
});
@ -1277,7 +1288,6 @@ void flush_quad_batch()
cur_batch_data_index = 0;
}
#define Y_COORD_IN_BACK (-1.0f)
#define Y_COORD_IN_FRONT (3.0f)
typedef struct DrawParams
@ -1523,7 +1533,7 @@ void dbgsquare(Vec2 at)
{
#ifdef DEVTOOLS
if(!show_devtools) return;
colorquad(true, quad_centered(at, V2(10.0, 10.0)), debug_color);
colorquad(true, quad_centered(at, V2(3.0, 3.0)), debug_color);
#else
(void)at;
#endif
@ -1885,8 +1895,6 @@ Vec2 move_and_slide(MoveSlideParams p)
typedef BUFF(AABB, 32) OverlapBuff;
OverlapBuff actually_overlapping = {0};
dbgcol(PINK)
dbgrect(at_new);
BUFF_ITER(AABB, &to_check)
{
if(overlapping(at_new, *it))
@ -2512,97 +2520,198 @@ void frame(void)
{
Entity *targeting = player;
// something kinda like A* pathfind to targeting, idk I just made it all up in like 10 minutes so it's probably broken
BUFF(Vec2, 1024) visited = {0};
BUFF(Vec2, 128) path = {0};
/*
G cost: distance from the current node to the start node
H cost: distance from the current node to the target node
G H
SUM
F cost: G + H
*/
Vec2 from = it->pos;
Vec2 to = targeting->pos;
const float jump_size = TILE_SIZE/4.0f;
typedef struct AStarNode {
bool exists;
struct AStarNode * parent;
bool in_closed_set;
bool in_open_set;
float f_score; // total of g score and h score
float g_score; // distance from the node to the start node
Vec2 pos;
} AStarNode;
BUFF(AStarNode, 1024) nodes = {0};
struct { Vec2 key; AStarNode *value; } *node_cache = 0;
#define V2_HASH(v) (FloorV2(v))
const float jump_size = TILE_SIZE/2.0f;
BUFF_APPEND(&nodes, ((AStarNode){.in_open_set = true, .pos = from}));
Vec2 from_hash = V2_HASH(from);
float got_there_tolerance = max_coord(entity_aabb_size(player))*1.5f;
hmput(node_cache, from_hash, &nodes.data[0]);
bool should_quit = false;
bool succeeded = false;
AStarNode *last_node = 0;
PROFILE_SCOPE("A* Pathfinding") // astar pathfinding a star
while(!should_quit)
{
int openset_size = 0;
BUFF_ITER(AStarNode, &nodes) if(it->in_open_set) openset_size += 1;
if(openset_size == 0)
{
should_quit = true;
}
else
{
AStarNode *current = 0;
PROFILE_SCOPE("Get lowest fscore astar node in open set")
{
float min_fscore = INFINITY;
int min_fscore_index = -1;
BUFF_ITER_I(AStarNode, &nodes, i)
if(it->in_open_set)
{
if(it->f_score < min_fscore)
{
min_fscore = it->f_score;
min_fscore_index = i;
}
}
assert(min_fscore_index >= 0);
current = &nodes.data[min_fscore_index];
assert(current);
}
BUFF_APPEND(&path, from);
BUFF_APPEND(&visited, from);
float length_to_goal = 0.0f;
PROFILE_SCOPE("get length to goal") length_to_goal = LenV2(SubV2(to, current->pos));
bool pathfinding_failed = false;
while(LenV2(SubV2(path.data[path.cur_index-1], to)) > jump_size*3.0)
if(length_to_goal <= got_there_tolerance)
{
succeeded = true;
should_quit = true;
last_node = current;
}
else
{
Vec2 compass[] = {
current->in_open_set = false;
Vec2 neighbor_positions[] = {
V2(-jump_size, 0.0f),
V2( jump_size, 0.0f),
V2(0.0f, jump_size),
V2(0.0f, -jump_size),
V2(-jump_size, jump_size),
V2( jump_size, jump_size),
V2( jump_size, -jump_size),
V2(-jump_size, -jump_size),
};
// compass is relative to the current head of the path
ARR_ITER(Vec2, compass) *it = AddV2(*it, path.data[path.cur_index-1]);
ARR_ITER(Vec2, neighbor_positions) *it = AddV2(*it, current->pos);
BUFF(Vec2, 4) possible_to_explore = {0};
Entity *e = it;
ARR_ITER(Vec2, compass)
PROFILE_SCOPE("Checking neighbor positions")
ARR_ITER(Vec2, neighbor_positions)
{
Vec2 want = *it;
Vec2 cur_pos = *it;
bool in_visited = false;
BUFF_ITER(Vec2, &visited)
{
if(V2ApproxEq(want, *it))
{
in_visited = true;
break;
}
}
dbgsquare(cur_pos);
bool would_block_me = false;
Overlapping overlapping_at_want = get_overlapping(&level_level0, entity_aabb_at(e, want));
PROFILE_SCOPE("Checking for overlap")
{
Overlapping overlapping_at_want = get_overlapping(&level_level0, entity_aabb_at(e, cur_pos));
BUFF_ITER(Overlap, &overlapping_at_want) if(is_overlap_collision(*it) && !(it->e && it->e == e)) would_block_me = true;
}
if(!in_visited && !would_block_me) BUFF_APPEND(&possible_to_explore, want);
if(would_block_me)
{
}
else
{
AStarNode *existing = 0;
Vec2 hash = V2_HASH(cur_pos);
existing = hmget(node_cache, hash);
if(possible_to_explore.cur_index == 0)
if(false)
PROFILE_SCOPE("look for existing A* node")
BUFF_ITER(AStarNode, &nodes)
{
if(path.cur_index == 0)
if(V2ApproxEq(it->pos, cur_pos))
{
pathfinding_failed = true;
existing = it;
break;
}
BUFF_REMOVE_BACK(&path);
if(path.cur_index == 0)
{
pathfinding_failed = true;
break;
}
float tentative_gscore = current->g_score + jump_size;
if(tentative_gscore < (existing ? existing->g_score : INFINITY))
{
if(!existing)
{
if(!BUFF_HAS_SPACE(&nodes))
{
should_quit = true;
succeeded = false;
}
else
{
int lowest_dist_index = -1;
float lowest_dist = INFINITY;
BUFF_ITER_I(Vec2, &possible_to_explore, i)
BUFF_APPEND(&nodes, (AStarNode){0});
existing = &nodes.data[nodes.cur_index-1];
existing->pos = cur_pos;
Vec2 pos_hash = V2_HASH(cur_pos);
hmput(node_cache, pos_hash, existing);
}
}
if(existing)
PROFILE_SCOPE("estimate heuristic")
{
float dist = LenV2(SubV2(to, *it));
if(dist < lowest_dist)
existing->parent = current;
existing->g_score = tentative_gscore;
float h_score = 0.0f;
{
lowest_dist = dist;
lowest_dist_index = i;
// diagonal movement heuristic from some article
Vec2 curr_cell = *it;
Vec2 goal = to;
float D = jump_size;
float D2 = LenV2(V2(jump_size, jump_size));
float dx = fabsf(curr_cell.x - goal.x);
float dy = fabsf(curr_cell.y - goal.y);
float h = D * (dx + dy) + (D2 - 2 * D) * fminf(dx, dy);
h_score += h;
// approx distance with manhattan distance
//h_score += fabsf(existing->pos.x - to.x) + fabsf(existing->pos.y - to.y);
}
existing->f_score = tentative_gscore + h_score;
existing->in_open_set = true;
}
}
}
}
}
}
}
assert(lowest_dist_index >= 0);
Vec2 new_point = possible_to_explore.data[lowest_dist_index];
hmfree(node_cache);
node_cache = 0;
if(!BUFF_HAS_SPACE(&visited) || !BUFF_HAS_SPACE(&path))
// reconstruct path
BUFF(Vec2, ARRLEN(nodes.data)) path = {0};
if(succeeded)
{
pathfinding_failed = true;
break;
}
else
assert(last_node);
AStarNode *cur = last_node;
while(cur)
{
BUFF_APPEND(&visited, new_point);
BUFF_APPEND(&path, new_point);
}
BUFF_PUSH_FRONT(&path, cur->pos);
cur = cur->parent;
}
}
Vec2 next_point_on_path = {0};
if(!pathfinding_failed)
if(succeeded)
{
assert(path.cur_index > 0);
if(path.cur_index == 1)
@ -2615,7 +2724,6 @@ void frame(void)
}
}
BUFF_ITER_I(Vec2, &path, i)
{
if(i == 0)
@ -2635,7 +2743,6 @@ void frame(void)
it->pos = move_and_slide((MoveSlideParams){it, it->pos, MulV2F(it->vel, pixels_per_meter * dt)});
AABB weapon_aabb = entity_sword_aabb(it, 30.0f, 18.0f);
dbgrect(weapon_aabb);
Vec2 target_vel = {0};
Overlapping overlapping_weapon = get_overlapping(cur_level, weapon_aabb);
if(it->swing_timer > 0.0)
@ -2682,7 +2789,7 @@ void frame(void)
}
if(npc_attacks_with_shotgun(it))
if(!pathfinding_failed)
if(succeeded)
{
Vec2 to_player = NormV2(SubV2(targeting->pos, it->pos));
Vec2 rotate_direction;

1895
thirdparty/stb_ds.h vendored
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