[Add] AI API functions, faction checks

scripts/ai/API

@@ -58,6 +58,16 @@ isstopped()
   -- Check if we are stopped.
     -- return true if stopped, false otherwise.
 
+isenemy(Pilot pilot)
+  -- Check if p is an enemy of current pilot.
+    -- p - Pilot to check if enemy.
+    -- return true if p is enemy.
+
+isally(Pilot p)
+  -- Check if p is an ally of current pilot.
+    -- p - Pilot to check if ally.
+    -- return true if p is ally.
+
 // ================
 // MOVEMENT!
 // ================
@@ -78,6 +88,19 @@ face(number/Vec2 target, number invert)
     -- invert face away if 1
     -- return number offset from target in grad
 
+// ================
+// COMBAT!
+// ================
+
+shoot([number weapon])
+  -- Make the pilot shoot weapons.
+    -- weapon to shoot, 1 if primary, 2 if secondary, 3 if both. Defaults to 1.
+    -- return nil.
+
+getenemy()
+  -- return the id of the nearest enemy.
+
+
 // ================
 // MISC!
 // ================

src/ai.c

@@ -73,6 +73,8 @@ static int ai_minbrakedist(lua_State* L); // Number minbrakedist()
 // Boolean expressions.
 static int ai_ismaxvel(lua_State* L);     // Boolean ismaxvel()
 static int ai_isstopped(lua_State* L);    // Boolean isstopped()
+static int ai_isenemy(lua_State* L);      // bool isenemy(pointer).
+static int ai_isally(lua_State* L);       // bool isally(pointer).
 // Movement.
 static int ai_accel(lua_State* L);        // accel(number); nuimber <= 1.
 static int ai_turn(lua_State* L);         // turn(number); abs(number) <= 1.
@@ -80,6 +82,7 @@ static int ai_face(lua_State* L);         // face(number/pointer)
 static int ai_brake(lua_State* L);        // Brake()
 // Combat.
 static int ai_shoot(lua_State* L);        // shoot(number) number = 1,2,3.
+static int ai_getenemy(lua_State* L);     // pointer getenemy().
 // Misc.
 static int ai_createvect(lua_State* L);   // createvect(number, number)
 static int ai_say(lua_State* L);          // say(string)
@@ -125,6 +128,8 @@ int ai_init(void) {
   // Boolean.
   lua_register(L, "ismaxvel",     ai_ismaxvel);
   lua_register(L, "isstopped",    ai_isstopped);
+  lua_register(L, "isenemy",      ai_isenemy);
+  lua_register(L, "isally",     ai_isally);
   // Movement.
   lua_register(L, "accel",        ai_accel);
   lua_register(L, "turn",         ai_turn);
@@ -132,6 +137,7 @@ int ai_init(void) {
   lua_register(L, "brake",        ai_brake);
   // Combat.
   lua_register(L, "shoot",        ai_shoot);
+  lua_register(L, "getenemy",     ai_getenemy);
   // Misc.
   lua_register(L, "createvect",   ai_createvect);
   lua_register(L, "say",          ai_say);
@@ -208,10 +214,15 @@ static int ai_pushtask(lua_State* L) {
   t->target = NULL;
 
   if(lua_gettop(L) > 2) {
-    if(lua_isnumber(L, 3))
+    if(lua_isnumber(L, 3)) {
+      t->dtype = TYPE_INT;
       t->ID = (unsigned int) lua_tonumber(L, 3);
-    else if(lua_islightuserdata(L, 3))
+    }
+    else if(lua_islightuserdata(L, 3)) {
+      t-dtype = TYPE_PTR;
       t->target = (void*)lua_topointer(L, 3);
+    } else
+      t->dtype = TYPE_NULL;
   }
 
   if(cur_pilot->task == NULL) // No other tasks.
@@ -248,14 +259,20 @@ static int ai_taskname(lua_State* L) {
 
 // Grab the target pointer.
 static int ai_gettarget(lua_State* L) {
+  if(cur_pilot->task->dtype == TYPE_PTR) {
     lua_pushlightuserdata(L, cur_pilot->task->target);
     return 1;
+  }
+  return 0;
 }
 
 // Get the ID.
 static int ai_gettargetid(lua_State* L) {
+  if(cur_pilot->task->dtype == TYPE_INT) {
     lua_pushnumber(L, cur_pilot->task->ID);
     return 1;
+  }
+  return 0;
 }
 
 // Get the distance from the pointer.
@@ -310,6 +327,16 @@ static int ai_isstopped(lua_State* L) {
   return 1;
 }
 
+// Check if the pilot is an enemy.
+static int ai_isenemy(lua_State* L) {
+  return 1;
+}
+
+// Check if the pilot is an ally.
+static int ai_isally(lua_State* L) {
+  return 1;
+}
+
 // Accelerate the pilot based on a param.
 static int ai_accel(lua_State* L) {
   pilot_acc = (lua_gettop(L) > 1 && lua_isnumber(L, 1)) ? ABS((double)lua_tonumber(L, 1)) : 1.;
@@ -356,6 +383,23 @@ static int ai_brake(lua_State* L) {
   return 0;
 }
 
+// Pew pew.. Says the pilot.
+static int ai_shoot(lua_State* L) {
+  int n = 1;
+  if(lua_isnumber(L, 1)) n = (int)lua_tonumber(L,1);
+
+  if(n == 1) pilot_primary = 1;
+  //else if(n == 2) pilot_secondary = 1;
+  //else if(n == 3) pilot_primary = pilot_secondary = 1;
+
+  return 0;
+}
+
+// Get the nearest enemy.
+static int ai_getenemy(lua_State* L) {
+  return 0;
+}
+
 // Create a vector.
 static int ai_createvect(lua_State* L) {
   MIN_ARGS(2);
@@ -392,15 +436,3 @@ static int ai_rng(lua_State* L) {
   return 1;
 }
 
-// Pew pew.. Says the pilot.
-static int ai_shoot(lua_State* L) {
-  int n = 1;
-  if(lua_isnumber(L, 1)) n = (int)lua_tonumber(L,1);
-
-  if(n == 1) pilot_primary = 1;
-  //else if(n == 2) pilot_secondary = 1;
-  //else if(n == 3) pilot_primary = pilot_secondary = 1;
-
-  return 0;
-}
-

src/ai.h

@@ -1,9 +1,13 @@
 #pragma once
 
+typedef enum { TYPE_NULL, TYPE_INT, TYPE_PTR } TaskData;
+
+// Basic task.
 typedef struct Task {
   struct Task* next;
   char* name;
   
+  TaskData dtype;
   union {
     void* target; // Vec2 etc.
     unsigned int ID; // Pilot ID etc.