Added a new 'testing ai', which can be started using a command line

option to either test it in play against computer, or in AI against
AI races. Atm the test_ai is nearly identical to the skidding
ai, except for one brake statement that needs to be investigated.

src/items/item.hpp

@@ -218,6 +218,7 @@ protected:
     // ------------------------------------------------------------------------
     // Some convenient functions for the AI only
     friend class SkiddingAI;
+    friend class TestAI;
     /** Returns true if the specified line segment would come close enough
      *  to this item so that this item would be collected.
      *  \param line The line segment which is tested if it is close enough

src/karts/controller/ai_base_controller.cpp

@@ -31,6 +31,7 @@
 #include <assert.h>
 
 bool AIBaseController::m_ai_debug = false;
+int  AIBaseController::m_test_ai  = 0;
 
 AIBaseController::AIBaseController(AbstractKart *kart)
                 : Controller(kart)

src/karts/controller/ai_base_controller.hpp

@@ -57,6 +57,13 @@ protected:
 
     static bool m_ai_debug;
 
+    /** Stores the '--test-ai=n' command line parameter:
+     *  It indicates which fraction of the AIs are going to
+     *  be the test AI: 1 means only to use the TestAI,
+     *  2 means every second AI will be test etc. Used
+     *  for AI testing only. */
+    static int m_test_ai;
+
     /** Position info structure of targets. */
     struct posData {bool behind; bool on_side; float angle; float distance;};
 
@@ -79,6 +86,8 @@ public:
     virtual bool disableSlipstreamBonus() const;
     virtual void crashed(const Material *m);
     static  void enableDebug() {m_ai_debug = true; }
+    static  void setTestAI(int n) {m_test_ai = n; }
+    static  int  getTestAI() { return m_test_ai; }
     virtual void crashed(const AbstractKart *k) {};
     virtual void handleZipper(bool play_sound) {};
     virtual void finishedRace(float time) {};

src/karts/controller/ai_properties.hpp

@@ -46,6 +46,7 @@ protected:
     friend class AIBaseLapController;
     friend class SkiddingAI;
     friend class ArenaAI;
+    friend class TestAI;
 
     /** Used to check that all values are defined in the xml file. */
     static float UNDEFINED;

src/karts/controller/test_ai.hpp

@@ -0,0 +1,246 @@
+
+//
+//  SuperTuxKart - a fun racing game with go-kart
+//  Copyright (C) 2004-2015  Steve Baker <sjbaker1@airmail.net>
+//  Copyright (C) 2006-2015  Eduardo Hernandez Munoz
+//  Copyright (C) 2010-2015  Joerg Henrichs
+//
+//  This program is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU General Public License
+//  as published by the Free Software Foundation; either version 3
+//  of the License, or (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+#ifndef HEADER_TEST_AI_HPP
+#define HEADER_TEST_AI_HPP
+
+
+// Some debugging features for the AI. For example you can visualise the
+// point the AI is aiming at, or visualise the curve the AI is predicting.
+// It works best with just 1 AI kart, so set the number of karts
+// to 2 in main.cpp with quickstart and run supertuxkart with the arg -N.
+// Or use --profile-laps=99 and run just one AI. Using the debug camera
+// (top view) is useful, too
+
+#ifdef DEBUG
+   // Enable AI graphical debugging
+#  undef AI_DEBUG
+   // Shows left and right lines when using new findNonCrashing function
+#  undef AI_DEBUG_NEW_FIND_NON_CRASHING
+   // Show the predicted turn circles
+#  undef AI_DEBUG_CIRCLES
+   // Show the heading of the kart
+#  undef AI_DEBUG_KART_HEADING
+   // Shows line from kart to its aim point
+#  undef AI_DEBUG_KART_AIM
+#endif
+
+
+#include "karts/controller/ai_base_lap_controller.hpp"
+#include "race/race_manager.hpp"
+#include "tracks/graph_node.hpp"
+#include "utils/random_generator.hpp"
+
+#ifdef AI_DEBUG
+  class ShowCurve;
+
+namespace irr
+{
+    namespace scene
+    {
+        class ISceneNode;
+    }
+}
+#endif
+
+/** This is a test version of the AI, which can be used to create new
+ *  AIs, and compare them with the current AI. It is otherwise (at this
+ *  stage) identical to the Skidding AI.
+\ingroup controller
+*/
+
+class TestAI : public AIBaseLapController
+{
+private:
+
+    class CrashTypes
+    {
+        public:
+
+        bool m_road; //true if we are going to 'crash' with the bounds of the road
+        int m_kart; //-1 if no crash, pos numbers are the kart it crashes with
+        CrashTypes() : m_road(false), m_kart(-1) {};
+        void clear() {m_road = false; m_kart = -1;}
+    } m_crashes;
+
+    RaceManager::AISuperPower m_superpower;
+
+    /*General purpose variables*/
+
+    /** Pointer to the closest kart ahead of this kart. NULL if this
+     *  kart is first. */
+    AbstractKart *m_kart_ahead;
+
+    /** Distance to the kart ahead. */
+    float m_distance_ahead;
+
+    /** Pointer to the closest kart behind this kart. NULL if this kart
+     *  is last. */
+    AbstractKart *m_kart_behind;
+
+    /** Distance to the kard behind. */
+    float m_distance_behind;
+
+    /** The actual start delay used. */
+    float m_start_delay;
+
+    /** Time an item has been collected and not used. */
+    float m_time_since_last_shot;
+
+    float m_time_since_stuck;
+
+    /** Direction of crash: -1 = left, 1 = right, 0 = no crash. */
+    int m_start_kart_crash_direction;
+
+    /** The direction of the track where the kart is on atm. */
+    GraphNode::DirectionType m_current_track_direction;
+
+    /** The radius of the curve the kart is currently driving. Undefined
+     *  when being on a straigt section. */
+    float m_current_curve_radius;
+
+    /** Stores the center of the curve (if the kart is in a curve,
+     *  otherwise undefined). */
+    Vec3  m_curve_center;
+
+    /** The index of the last node with the same direction as the current
+     *  node the kart is on. If kart is in a left turn, this will be
+     *  the last node that is still turning left etc. */
+    unsigned int m_last_direction_node;
+
+    /** If set an item that the AI should aim for. */
+    const Item *m_item_to_collect;
+
+    /** True if items to avoid are close by. Used to avoid using zippers
+     *  (which would make it more difficult to avoid items). */
+    bool m_avoid_item_close;
+
+    /** Distance to the player, used for rubber-banding. */
+    float m_distance_to_player;
+
+    /** A random number generator to decide if the AI should skid or not. */
+    RandomGenerator m_random_skid;
+
+    /** This implements a simple finite state machine: it starts in
+     *  NOT_YET. The first time the AI decides to skid, the state is changed
+     *  randomly (depending on skid probability) to NO_SKID or SKID.
+     *  As long as the AI keeps on deciding to skid, the state remains
+     *  unchanged (so no new random decision is made) till it decides
+     *  not to skid. In which case the state is set to NOT_YET again.
+     *  This guarantees that for each 'skidable' section of the track
+     *  the random decision is only done once. */
+    enum {SKID_PROBAB_NOT_YET, SKID_PROBAB_NO_SKID, SKID_PROBAB_SKID}
+          m_skid_probability_state;
+
+    /** The last item selected for collection, for which a probability
+     *  was determined. */
+    const Item *m_last_item_random;
+
+    /** True if m_last_item_random was randomly selected to be collected. */
+    bool m_really_collect_item;
+
+    /** A random number generator for collecting items. */
+    RandomGenerator m_random_collect_item;
+
+    /** \brief Determines the algorithm to use to select the point-to-aim-for
+     *  There are three different Point Selection Algorithms:
+     *  1. findNonCrashingPoint() is the default (which is actually slightly
+     *     buggy, but so far best one after handling of 90 degree turns was
+     *     added).
+     *  2. findNonCrashingPointFixed() which fixes the bugs of the default
+     *     algorithm.
+     *  3. findNonCrashingPointNew() A newly designed algorithm, which is
+     *     faster than the standard one, but does not give as good results
+     *     as the 'buggy' one.
+     *
+     *  So far the default one has by far the best performance, even though
+     *  it has bugs. */
+    enum {PSA_DEFAULT, PSA_FIXED, PSA_NEW}
+          m_point_selection_algorithm;
+
+#ifdef AI_DEBUG
+    /** For skidding debugging: shows the estimated turn shape. */
+    ShowCurve **m_curve;
+
+    /** For debugging purpose: a sphere indicating where the AI
+     *  is targeting at. */
+    irr::scene::ISceneNode *m_debug_sphere[4];
+
+    /** For item debugging: set to the item that is selected to
+     *  be collected. */
+    irr::scene::ISceneNode *m_item_sphere;
+#endif
+
+
+    /*Functions called directly from update(). They all represent an action
+     *that can be done, and end up setting their respective m_controls
+     *variable, except handle_race_start() that isn't associated with any
+     *specific action (more like, associated with inaction).
+     */
+    void  handleRaceStart();
+    void  handleAcceleration(const float dt);
+    void  handleSteering(float dt);
+    void  handleItems(const float dt);
+    void  handleRescue(const float dt);
+    void  handleBraking();
+    void  handleNitroAndZipper();
+    void  computeNearestKarts();
+    void  handleItemCollectionAndAvoidance(Vec3 *aim_point,
+                                           int last_node);
+    bool  handleSelectedItem(float kart_aim_angle, Vec3 *aim_point);
+    bool  steerToAvoid(const std::vector<const Item *> &items_to_avoid,
+                       const core::line2df &line_to_target,
+                       Vec3 *aim_point);
+    bool  hitBadItemWhenAimAt(const Item *item,
+                              const std::vector<const Item *> &items_to_avoid);
+    void  evaluateItems(const Item *item, float kart_aim_angle,
+                        std::vector<const Item *> *items_to_avoid,
+                        std::vector<const Item *> *items_to_collect);
+
+    void  checkCrashes(const Vec3& pos);
+    void  findNonCrashingPointFixed(Vec3 *result, int *last_node);
+    void  findNonCrashingPointNew(Vec3 *result, int *last_node);
+    void  findNonCrashingPoint(Vec3 *result, int *last_node);
+
+    void  determineTrackDirection();
+    void  determineTurnRadius(const Vec3 &start,
+                              const Vec3 &start_direction,
+                              const Vec3 &end,
+                              Vec3 *center,
+                              float *radius);
+    virtual bool canSkid(float steer_fraction);
+    virtual void setSteering(float angle, float dt);
+    void handleCurve();
+
+protected:
+    virtual unsigned int getNextSector(unsigned int index);
+
+public:
+                 TestAI(AbstractKart *kart);
+                ~TestAI();
+    virtual void update      (float delta) ;
+    virtual void reset       ();
+    virtual const irr::core::stringw& getNamePostfix() const;
+};
+
+#endif
+
+/* EOF */

src/main.cpp

@@ -531,6 +531,9 @@ void cmdLineHelp()
     // "       --history=n        Replay history file 'history.dat' using:\n"
     // "                            n=1: recorded positions\n"
     // "                            n=2: recorded key strokes\n"
+    // "       --test-ai=n        Use the test-ai for every n-th AI kart.\n"
+    // "                          (so n=1 means all Ais will be the test ai)\n"
+    // "                             
     "       --server=name      Start a server (not a playing client).\n"
     "       --lan-server=name  Start a LAN server (not a playing client).\n"
     "       --server-password= Sets a password for a server (both client&server).\n"
@@ -763,6 +766,8 @@ int handleCmdLine()
         UserConfigParams::m_rendering_debug=true;
     if(CommandLine::has("--ai-debug"))
         AIBaseController::enableDebug();
+    if(CommandLine::has("--test-ai", &n))
+        AIBaseController::setTestAI(n);
     if (CommandLine::has("--fps-debug"))
         UserConfigParams::m_fps_debug = true;
 

src/main_loop.cpp

@@ -61,6 +61,12 @@ MainLoop::~MainLoop()
  */
 float MainLoop::getLimitedDt()
 {
+    // In profile mode without graphics, run with a fixed dt of 1/60
+    if (ProfileWorld::isProfileMode() && ProfileWorld::isNoGraphics())
+    {
+        return 1.0f/60.0f;
+    }
+
     IrrlichtDevice* device = irr_driver->getDevice();
     m_prev_time = m_curr_time;
 

src/modes/world.cpp

@@ -36,6 +36,7 @@
 #include "karts/controller/end_controller.hpp"
 #include "karts/controller/local_player_controller.hpp"
 #include "karts/controller/skidding_ai.hpp"
+#include "karts/controller/test_ai.hpp"
 #include "karts/controller/network_player_controller.hpp"
 #include "karts/kart.hpp"
 #include "karts/kart_properties_manager.hpp"
@@ -384,6 +385,11 @@ Controller* World::loadAIController(AbstractKart *kart)
     switch(turn)
     {
         case 0:
+            // If requested, start the test ai
+            if( (AIBaseController::getTestAI()!=0                       ) && 
+                ( (kart->getWorldKartId()+1) % AIBaseController::getTestAI() )==0)
+                controller = new TestAI(kart);
+            else
                 controller = new SkiddingAI(kart);
             break;
         case 1: