feat: Basic NPC wandering

code/game/impl/npc.c

@@ -0,0 +1,50 @@
+#include "../npc.h"
+#include "../world.h"
+#include "../../core/types.h"
+#include "nav.c"
+#include <stdio.h>
+
+void updateNPC(F32 delta, NPC *npc, World *world) {
+  switch (npc->mode) {
+    case NPC_ACTION_WAITING:
+      npc->waitTime+=delta;
+      if(npc->waitTime > npc->maxWaitTime) {
+        npc->mode = NPC_ACTION_WALKING;
+        U32 next = npc->targetNavNode == 100 ? 20 : 100;
+        npc->targetNavNode = next; // TODO RANDOM
+        printf("Starting to nav path\n");
+        npc->path = Nav_Path(world->navMesh, npc->currentNavNode, npc->targetNavNode);
+        printf("done\n");
+        npc->walkTimer = 0;
+        printf("%*.s started walking to %d\n", Sv(npc->name), npc->targetNavNode);
+      }
+    break;
+    case NPC_ACTION_WALKING:
+      npc->walkTimer+=delta;
+      if(npc->walkTimer >= NPC_SPEED){
+        npc->walkTimer = 0;
+        if(npc->path.nodeCount == npc->pathIndex+1){
+          printf("Finished! so I'm waiting");
+          npc->mode = NPC_ACTION_WAITING;
+          npc->maxWaitTime = 20; // TODO RANDOM
+          npc->waitTime = 0;
+          npc->pathIndex = 0;
+          return;
+        }
+        npc->pathIndex+=1;
+        npc->currentNavNode = npc->path.indexes[npc->pathIndex];
+      }
+      NavNode cNav = world->navMesh.nodes[npc->currentNavNode];
+      NavNode tNav = world->navMesh.nodes[npc->pathIndex];
+      npc->collision.pos.x = cNav.pos.x * (1 - npc->walkTimer/NPC_SPEED) + tNav.pos.x * npc->walkTimer/NPC_SPEED;
+      npc->collision.pos.y = cNav.pos.y * (1 - npc->walkTimer/NPC_SPEED) + tNav.pos.y * npc->walkTimer/NPC_SPEED;
+    break;
+  }
+}
+
+void UpdateNPCs(F32 delta, World *world) {
+  for(int i = 0; i < world->npcCount; i++) {
+    updateNPC(delta, &world->npcs[i], world);
+  }
+} 
+