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Opponent Behaviour.cpp
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Opponent Behaviour.cpp
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/**************************************************************************
Opponent Behaviour.cpp - Functions relating to opponents's car behaviour
**************************************************************************/
/* ============= */
/* Include files */
/* ============= */
#include "dxstdafx.h"
#include <stdlib.h>
#include "StuntCarRacer.h"
#include "Opponent Behaviour.h"
#include "Car Behaviour.h"
#include "Track.h"
#include "3D Engine.h"
/* ===== */
/* Debug */
/* ===== */
//#define TEST_AMIGA_RWP
//#define TEST_AMIGA_OPI
//#define TEST_AMIGA_MOTOS
//#define TEST_AMIGA_ROS
#define OPPONENT_SHADOW
//#define USE_OPP_CENTRE_POS
//#define CALC_FRONT_X_Z_FROM_SCRATCH
#if defined(DEBUG) || defined(_DEBUG)
extern FILE *out;
extern bool bTestKey;
#endif
/* ========= */
/* Constants */
/* ========= */
#define FALSE 0
#define TRUE 1
#define NUM_OPPONENTS (11)
#define NUM_X_SPANS (32)
#define LOCAL_Y_FACTOR 4
typedef enum
{
REAR_LEFT = 0,
REAR_RIGHT,
FRONT,
NUM_OPP_WHEEL_POSITIONS
} OppWheelPositionType;
/* =========== */
/* Global data */
/* =========== */
long opponentsID = NO_OPPONENT; // 0 to 10
long opponents_current_piece = 0; // use as opponents_road_section
bool player_close_to_opponent = FALSE;
bool opponent_behind_player = FALSE;
// Values for each piece of each track (Global because MoveDrawBridge() modifies the Draw Bridge values)
// NOTE: These are for the Standard league. Super league values are different
unsigned char opponents_speed_values[NUM_TRACKS][MAX_PIECES_PER_TRACK] =
{
{
/* Little Ramp data */
0x76,0x6c,0x62,0x58,0x7a,0x7a,0x70,0x66,0x5c,0x52,0x48,0x48,0x48,0x7a,0x7a,0x7a,
0x7a,0x7a,0x7a,0x7a,0x70,0x66,0x5c,0x52,0x48,0x48,0x48,0x48,0x78,0x6e,0x64,0x5a,
0x50,0x46,0x7a,0x70,0x66,0x5c,0x52,0x48,0x48,0x48,0x48,0x7c
},
{
/* Stepping Stones data */
0xf2,0xe8,0xde,0xd4,0x67,0x5d,0x53,0x49,0x3f,0x4b,0x41,0x41,0xc1,0xd2,0xc8,0xbe,
0xc7,0xbd,0xc5,0xbb,0xc4,0xba,0x55,0x4b,0x41,0x41,0x41,0x60,0x56,0x4c,0x42,0x7d,
0x7d,0x73,0x69,0x5f,0x55,0x4b,0x41,0x41,0x41,0xfd,0xfd,0xfd,0xf3,0x7d,0x7d,0x73,
0x69,0x5f,0x55,0x4b,0x41,0x41,0x41,0x7c
},
{
/* Hump Back data */
0x52,0x4d,0x77,0x77,0x77,0x6d,0x63,0x59,0x4f,0x45,0x45,0x45,0x77,0x77,0x77,0x77,
0x77,0x77,0x77,0x6d,0x63,0x59,0x4f,0x45,0x45,0x45,0x56,0x4c,0x77,0x77,0x6d,0x63,
0x59,0x4f,0x45,0x45,0x45,0x4f,0x61,0x57,0x4d,0x45,0x4f,0x45,0x45,0x63,0x59,0x4f,
0x45,0x45,0x45,0x66,0x5c
},
{
/* Big Ramp data */
0x7a,0x7a,0x7a,0x7a,0x7a,0x7a,0x70,0x66,0x5c,0x52,0x48,0x48,0x48,0x58,0x4e,0x4b,
0x69,0x5f,0x55,0x4b,0x46,0x66,0x5c,0x52,0x48,0x48,0x48,0x48,0x7e,0xf4,0xea,0xe0,
0xd6,0x7a,0x7a,0x70,0x66,0x5c,0x52,0x48,0x48,0x48,0x48,0x7c
},
{
/* Ski Jump data */
0x42,0xec,0xe2,0xd8,0x77,0x77,0x77,0x6d,0x63,0x59,0x4f,0x4f,0x4f,0x4f,0x63,0x59,
0x4f,0x4f,0x72,0x68,0x5e,0x54,0x4a,0x40,0x36,0x4f,0x4f,0x4f,0x6a,0xe0,0xd6,0xcc,
0xc2,0x63,0x59,0x4f,0xcf,0xcf,0xcf,0xc9,0x56,0x56,0x56,0x7e,0x7e,0x7e,0x7e,0x7e,
0x7e,0x74,0x6a,0x60,0x56,0x56,0x56,0x56,0x56,0x7e,0x7e,0x7e,0x7e,0x7e,0x7e,0x74,
0x6a,0x60,0x56,0x56,0x56,0x7e,0x7e,0x74,0x6a,0x60,0x56,0x56,0x5a,0x52
},
{
/* Draw Bridge data */
0x76,0x76,0x6c,0x62,0x69,0x5f,0x55,0x50,0x58,0x58,0x58,0x76,0x76,0x76,0x6c,0x62,
0x58,0x58,0x58,0x4d,0x43,0x76,0x76,0x76,0x76,0x76,0x6c,0x62,0x58,0x58,0x58,0x58,
0x58,0x78,0x78,0x78,0x78,0x78,0x78,0x78,0x78,0x78,0xf8,0xee,0xe4,0x5a,0x50,0xc6,
0x76,0x76,0x76,0xbb,0xbb,0x76,0x76,0x76,0x6c,0x62,0xd8,0xd8,0xd8,0xe4,0xf6,0xec,
0xe2,0xd8,0x76,0x76,0x76,0x76,0x6c,0x62,0x58,0x58,0x58,0x58,0x58,0x7c
},
{
/* High Jump data */
0xe7,0xdd,0xd3,0x77,0x77,0x77,0x77,0x6d,0x63,0x59,0x4f,0x4f,0x4f,0x7a,0x7a,0x7a,
0x7a,0x7a,0x70,0x66,0x5c,0x52,0x52,0x55,0x59,0x4f,0x4f,0x77,0x77,0x77,0x77,0x6d,
0x63,0x59,0x4f,0x4f,0xcf,0xe7,0xdd,0xd3,0xce,0x77,0x77,0x77,0x77,0x6d,0x63,0x59,
0x4f,0x4f,0x4f,0x7c,0x41,0x41,0x41,0x7c
},
{
/* Roller Coaster data */
0x66,0x5c,0x52,0x48,0x3e,0x34,0x2a,0x29,0x6a,0x60,0x56,0x56,0x56,0x40,0x36,0x7e,
0x7e,0x7e,0x7e,0x7e,0x7e,0x74,0x6a,0x60,0x56,0x56,0x54,0x4a,0x7e,0x7e,0x7e,0x7e,
0x7e,0x7e,0x7e,0x74,0x6a,0x60,0x56,0x56,0x56,0x56,0x56,0x7e,0x7e,0x7e,0x7e,0x7e,
0x7e,0x74,0x6a,0x60,0x56,0x56,0x56,0x56,0x56,0x7e,0x7e,0x7e,0x7e,0x7e,0x7e,0x74,
0x6a,0x60,0x56,0x56,0x56,0x7e,0x7e,0x74,0x6a,0x60,0x56,0x56,0x5a,0x52
}
};
WCHAR *opponentNames[NUM_OPPONENTS] =
{
L"Hot Rod ",
L"Whizz Kid ",
L"Bad Guy ",
L"The Dodger ",
L"Big Ed ",
L"Max Boost ",
L"Dare Devil ",
L"High Flyer ",
L"Bully Boy ",
L"Jumping Jack",
L"Road Hog "
};
extern IDirectSoundBuffer8 *HitCarSoundBuffer;
/* =========== */
/* Static data */
/* =========== */
// Opponent attributes
#define OBSTRUCTS_PLAYER 2
#define WHEELIE 4
#define DRIVES_NEAR_EDGE 8
#define UNUSED4 16
#define PUSH_PLAYER 32
#define UNUSED6 64
static unsigned char opponent_attributes[NUM_OPPONENTS] =
{
// Hot Rod
PUSH_PLAYER|OBSTRUCTS_PLAYER,
// Whizz Kid
PUSH_PLAYER,
// Bad Guy
UNUSED6|PUSH_PLAYER|OBSTRUCTS_PLAYER,
// The Dodger
PUSH_PLAYER,
// Big Ed
PUSH_PLAYER|UNUSED4|DRIVES_NEAR_EDGE|WHEELIE|OBSTRUCTS_PLAYER,
// Max Boost
WHEELIE,
// Dare Devil
PUSH_PLAYER|UNUSED4,
// High Flyer
UNUSED4|WHEELIE,
// Bully Boy
UNUSED6|DRIVES_NEAR_EDGE|OBSTRUCTS_PLAYER,
// Jumping Jack
UNUSED4,
// Road Hog
DRIVES_NEAR_EDGE
};
// Values for each track
static unsigned char opp_track_speed_values[] = //DAT.1fe2c
{
// Standard league
0x07,0x07,0x07,0x07,0x07,0x07,0x07,0x07,
0x41,0x3a,0x3e,0x41,0x48,0x51,0x48,0x4f,
//0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, // used when creating opponents.speed.values
//0x48,0x41,0x45,0x48,0x4f,0x58,0x4f,0x56, // used when creating opponents.speed.values
// Super league
0x07,0x03,0x03,0x03,0x03,0x03,0x07,0x03,
0x66,0x57,0x57,0x59,0x59,0x69,0x62,0x64
//0x07,0x03,0x03,0x03,0x03,0x01,0x03,0x03, // used when creating opponents.speed.values
//0x61,0x55,0x53,0x56,0x58,0x5b,0x5a,0x62 // used when creating opponents.speed.values
};
static long opponents_distance_into_section;
static long opponents_road_x_position;
// Three co-ordinates needed for opponent behaviour (as per original Amiga StuntCarRacer)
static COORD_3D opp_rear_left_road_pos;
static COORD_3D opp_rear_right_road_pos;
static long opp_front_road_pos_y; //X,Z not needed
// Additional co-ordinates needed for PC StuntCarRacer (for calculating opponent orientation)
static COORD_3D opp_front_left_road_pos;
static COORD_3D opp_front_right_road_pos;
#ifdef USE_OPP_CENTRE_POS
COORD_XZ opp_centre_road_pos;
#endif
static COORD_3D opp_shadow_rear_left;
static COORD_3D opp_shadow_rear_right;
static COORD_3D opp_shadow_front_left;
static COORD_3D opp_shadow_front_right;
// wheel heights
static long opp_actual_height[NUM_OPP_WHEEL_POSITIONS];
static long opp_smallest_difference;
static long opp_old_rear_left_difference;
static long opp_old_rear_right_difference;
static long opp_old_front_difference;
static long opp_new_rear_left_difference;
static long opp_new_rear_right_difference;
static long opp_new_front_difference;
static long opp_touching_road;
static long opp_y_acceleration[NUM_OPP_WHEEL_POSITIONS];
static long opp_y_speed[NUM_OPP_WHEEL_POSITIONS];
static long opp_engine_power = 236; // (236 standard, 314 super)
static long opponents_engine_z_acceleration;
static long opponents_max_speed;
static long opponents_z_speed;
static bool opponents_required_z_speed_reached;
/* ===================== */
/* Function declarations */
/* ===================== */
static void ResetOpponent (void);
static void CalculateOpponentsRoadWheelPositions( void );
static void GetSurfaceCoords( long piece, long segment );
static long CalcSurfacePosition( long *next_segment, long distance, long z_shift );
static void CalculateOpponentsRoadWheelHeight( long sx, long sz, long *y_out );
static void OpponentMovement( void );
static void UpdateOpponentsActualWheelHeights( void );
static void CalculateWheelDifference( long road_height,
long actual_height,
long height_adjust,
long *old_difference_in_out,
long *new_difference_out,
long *touching_road);
static long LimitOpponentWheels( long max_difference, long wheel1, long wheel2 );
static void AverageWheelYSpeeds( long wheel1, long wheel2 );
static void RandomizeOpponentsSteering( void );
static void GetOpponentsEngineAcceleration( void );
static void AdjustOpponentsEngineAcceleration( void );
static void UpdateOpponentsZSpeed( void );
static void CalculateDistancesBetweenPlayers( void );
static void OpponentPlayerInteraction( void );
static void MoveOpponentToOneSide( void );
static void OpponentPushPlayer( void );
/* ======================================================================================= */
/* Function: ResetOpponent */
/* */
/* Description: Reset all opponent behaviour variables to their initial state */
/* ======================================================================================= */
static void ResetOpponent (void)
{
opponentsID = rand() % NUM_OPPONENTS;
// opponentsID = 9; // Jumping Jack
opp_old_rear_left_difference = 0;
opp_old_rear_right_difference = 0;
opp_old_front_difference = 0;
for (long i = 0; i < NUM_OPP_WHEEL_POSITIONS; i++)
{
opp_y_speed[i] = 0;
}
opponents_z_speed = 0;
opponents_required_z_speed_reached = FALSE;
player_close_to_opponent = FALSE;
opponent_behind_player = FALSE;
return;
}
/* ======================================================================================= */
/* Function: OpponentBehaviour */
/* */
/* Description: */
/* ======================================================================================= */
extern bool bNewGame;
extern long TrackID;
extern TRACK_PIECE Track[MAX_PIECES_PER_TRACK];
extern long Track_Map[NUM_TRACK_CUBES][NUM_TRACK_CUBES]; // [x][z]
extern long NumTrackPieces;
extern long PlayersStartPiece;
//#define USE_ROAD_Y
#define NEW_OPP_METHOD
// current surface co-ords
static long sx1, sy1, sz1, sx2, sy2, sz2, sx3, sy3, sz3, sx4, sy4, sz4;
void OpponentBehaviour (long *x,
long *y,
long *z,
float *x_angle,
float *y_angle,
float *z_angle,
bool bOpponentPaused)
{
long opponent_x, opponent_y, opponent_z;
float opponent_x_angle = 0.0f, opponent_y_angle = 0.0f, opponent_z_angle = 0.0f;
// reset opponent
if (bNewGame)
{
ResetOpponent();
opponents_current_piece = PlayersStartPiece;
opponents_distance_into_section = 0x400; // half way into section
opponents_road_x_position = 0x4c;
//temp opponents_road_x_position = 0x1c;
//temp opponents_road_x_position = 0xe4;
// initialise.opponent.data
CalculateOpponentsRoadWheelPositions();
// Position the opponent a random amount above the road
int r = rand();
r &= 0x7f;
r += 0x68;
opp_actual_height[REAR_LEFT] = opp_rear_left_road_pos.y + r;
opp_actual_height[REAR_RIGHT] = opp_rear_right_road_pos.y + r;
opp_actual_height[FRONT] = opp_front_road_pos_y + r;
// end initialise.opponent.data
// Set opponent_max_speed
long s = (long)rand() & (long)opp_track_speed_values[TrackID];
s += (long)opp_track_speed_values[TrackID+8];
opponents_max_speed = s;
//temp opponents_max_speed = 10;
bNewGame = FALSE;
}
CalculatePlayersRoadPosition();
if (!bOpponentPaused)
{
OpponentMovement();
CalculateDistancesBetweenPlayers();
OpponentPlayerInteraction();
}
else
CalculateDistancesBetweenPlayers();
CalculateOpponentsRoadWheelPositions();
//
// Calculate opponent's new centre point ...
//
/*
* Calculate opponent's x position
*/
opponent_x = (opp_front_left_road_pos.x + opp_front_right_road_pos.x + opp_rear_left_road_pos.x + opp_rear_right_road_pos.x) / 4;
opponent_x <<= LOG_PRECISION;
#ifdef USE_OPP_CENTRE_POS
// VALUE1 = (bTestKey ? 1 : 0);
VALUE2 = VALUE3 = 0;
if (bTestKey)
{
VALUE2 = opponent_x;
opponent_x = opp_centre_road_pos.x;
opponent_x <<= LOG_PRECISION;
VALUE3 = opponent_x;
}
#endif
/*
* Calculate opponent's y position
*/
#ifdef NEW_OPP_METHOD
long vis_rear_left_y, vis_rear_right_y, vis_front_y;
vis_rear_left_y = opp_rear_left_road_pos.y > opp_actual_height[REAR_LEFT] ? opp_rear_left_road_pos.y : opp_actual_height[REAR_LEFT];
vis_rear_right_y = opp_rear_right_road_pos.y > opp_actual_height[REAR_RIGHT] ? opp_rear_right_road_pos.y : opp_actual_height[REAR_RIGHT];
vis_front_y = opp_front_road_pos_y > opp_actual_height[FRONT] ? opp_front_road_pos_y : opp_actual_height[FRONT];
long rear_y = (vis_rear_left_y + vis_rear_right_y) / 2;
opponent_y = (rear_y + vis_front_y) / 2;
#else
long road_y = (opp_rear_left_road_pos.y + opp_rear_right_road_pos.y) / 2;
road_y = (road_y + opp_front_road_pos_y) / 2;
#ifdef USE_ROAD_Y
long rear_y = (opp_rear_left_road_pos.y + opp_rear_right_road_pos.y) / 2;
opponent_y = (rear_y + opp_front_road_pos_y) / 2;
#else
long rear_y = (opp_actual_height[REAR_LEFT] + opp_actual_height[REAR_RIGHT]) / 2;
opponent_y = (rear_y + opp_actual_height[FRONT]) / 2;
#endif
if (opponent_y < road_y) opponent_y = road_y;
#endif
// Raise the opponent slightly (to stop them sinking into road due to inaccurate heights)
opponent_y += 20;
opponent_y <<= (LOG_PRECISION-3);
/*
* Calculate opponent's z position
*/
opponent_z = (opp_front_left_road_pos.z + opp_front_right_road_pos.z + opp_rear_left_road_pos.z + opp_rear_right_road_pos.z) / 4;
opponent_z <<= LOG_PRECISION;
#ifdef USE_OPP_CENTRE_POS
if (bTestKey)
{
opponent_z = opp_centre_road_pos.z;
opponent_z <<= LOG_PRECISION;
}
#endif
//
// Calculate opponent's new angles
//
// Along car's x axis, only use y and z components
#ifdef USE_ROAD_Y
double yd = (double)(rear_y - opp_front_road_pos_y) / 2; // Note y is halved because of unit differences between y and x,z
#else
#ifdef NEW_OPP_METHOD
double yd = (double)(rear_y - vis_front_y) / 2; // Note y is halved because of unit differences between y and x,z
#else
double yd = (double)(rear_y - opp_actual_height[FRONT]) / 2; // Note y is halved because of unit differences between y and x,z
#endif
#endif
long rear_x = (opp_rear_left_road_pos.x + opp_rear_right_road_pos.x) / 2;
long rear_z = (opp_rear_left_road_pos.z + opp_rear_right_road_pos.z) / 2;
long front_x = (opp_front_left_road_pos.x + opp_front_right_road_pos.x) / 2;
long front_z = (opp_front_left_road_pos.z + opp_front_right_road_pos.z) / 2;
double xd = (double)(rear_x - front_x);
double zd = (double)(rear_z - front_z);
double carzd = sqrt((xd*xd) + (zd*zd));
opponent_x_angle = (float)atan2(yd, carzd);
// Along car's y axis, only use x and z components
xd = (double)(opp_rear_left_road_pos.x - opp_rear_right_road_pos.x);
zd = (double)(opp_rear_left_road_pos.z - opp_rear_right_road_pos.z);
// opponent_y_angle = (float)atan2(xd, zd) + D3DX_PI/2;
opponent_y_angle = (float)atan2(zd, -xd);
// Along car's z axis, only use x and y components
#ifdef USE_ROAD_Y
yd = (double)(opp_rear_left_road_pos.y - opp_rear_right_road_pos.y) / 2; // Note y is halved because of unit differences between y and x,z
#else
#ifdef NEW_OPP_METHOD
yd = (double)(vis_rear_left_y - vis_rear_right_y) / 2; // Note y is halved because of unit differences between y and x,z
#else
yd = (double)(opp_actual_height[REAR_LEFT] - opp_actual_height[REAR_RIGHT]) / 2; // Note y is halved because of unit differences between y and x,z
#endif
#endif
double carxd = sqrt((xd*xd) + (zd*zd));
opponent_z_angle = (float)atan2(-yd, carxd);
// output opponent values for use by functions that draw the world
*x = opponent_x;
*y = -(opponent_y * LOCAL_Y_FACTOR);
*z = opponent_z;
*x_angle = opponent_x_angle;
*y_angle = opponent_y_angle;
*z_angle = opponent_z_angle;
}
/* ======================================================================================= */
/* Function: CalculateOpponentsRoadWheelPositions */
/* */
/* Description: */
/* ======================================================================================= */
// current surface co-ords
//static long sx1, sy1, sz1, sx2, sy2, sz2, sx3, sy3, sz3, sx4, sy4, sz4;
static long B1bbbe[3] = {0,0,0}; // set by randomize.opponents.steering
// third value is opponents.random.steering.count
static long opponents_x_spans[NUM_X_SPANS] =
{27,27,27,27,27,26,26,26,25,25,25,24,23,23,22,21,20,19,18,17,15,14,11,9,7,7,7,7,7,7,7,7};
#ifdef OPPONENT_SHADOW
extern void RemoveShadowTriangles( void );
extern void StoreShadowTriangle( D3DXVECTOR3 v1, D3DXVECTOR3 v2, D3DXVECTOR3 v3, long other_colour );
#endif
// All three road heights tested against Amiga
static void CalculateOpponentsRoadWheelPositions( void )
{
long distance, segment, surface_position;
long piece = opponents_current_piece, next_segment;
long left_side_x, left_side_z, right_side_x, right_side_z;
bool draw_shadow = TRUE;
/*
* Rear wheels
*/
#ifdef TEST_AMIGA_RWP
if (GetRecordedAmigaWord(&piece))
++VALUE2;
GetRecordedAmigaWord(&opponents_distance_into_section);
GetRecordedAmigaWord(&opponents_road_x_position);
GetRecordedAmigaWord(&opp_actual_height[REAR_LEFT]);
GetRecordedAmigaWord(&opp_actual_height[REAR_RIGHT]);
GetRecordedAmigaWord(&opp_actual_height[FRONT]);
#endif
// Rear wheel position
distance = opponents_distance_into_section - 64;
if (distance < 0)
{
// DIRECTION DEPENDANT
// go to previous piece
piece--; if (piece < 0) piece = (NumTrackPieces - 1);
distance += (Track[piece].numSegments * 256);
}
#ifdef TEST_AMIGA_RWP
CompareRecordedAmigaWord("opponents.road.section.m64", &piece);
CompareRecordedAmigaWord("opponents.distance.into.section.minus64", &distance);
#endif
// Fetch 4 surface co-ords surrounding rear wheels (opponents.distance.into.section.minus64 / 256)
segment = distance >> 8;
GetSurfaceCoords(piece, segment);
// Don't draw opponent's shadow on black road segments
if (Track[piece].roadColour[segment] == SCR_BASE_COLOUR + 0)
draw_shadow = FALSE;
// Calculate segment left side x,z at opponents.distance.into.section.minus64
surface_position = CalcSurfacePosition(&next_segment, distance, B1bbbe[0]);
if (!next_segment)
{
left_side_x = sx2 + ((surface_position * (sx1-sx2)) >> 8);
left_side_z = sz2 + ((surface_position * (sz1-sz2)) >> 8);
}
else
{
// Use other end's value as base
// (Amiga StuntCarRacer does this, but not correct as should really use next segment's values)
left_side_x = sx1 + ((surface_position * (sx1-sx2)) >> 8);
left_side_z = sz1 + ((surface_position * (sz1-sz2)) >> 8);
}
// Calculate segment right side x,z at opponents.distance.into.section.minus64
surface_position = CalcSurfacePosition(&next_segment, distance, B1bbbe[2]);
if (!next_segment)
{
right_side_x = sx3 + ((surface_position * (sx4-sx3)) >> 8);
right_side_z = sz3 + ((surface_position * (sz4-sz3)) >> 8);
}
else
{
// Use other end's value as base
// (Amiga StuntCarRacer does this, but not correct as should really use next segment's values)
right_side_x = sx4 + ((surface_position * (sx4-sx3)) >> 8);
right_side_z = sz4 + ((surface_position * (sz4-sz3)) >> 8);
}
next_segment = FALSE;
long i = abs(opp_actual_height[REAR_LEFT] - opp_actual_height[REAR_RIGHT]) >> 4;
// Get half the x distance that the opponent's rear wheels span
if (i < 0) i = 0;
if (i >= NUM_X_SPANS) i = NUM_X_SPANS-1;
long opponents_x_span = opponents_x_spans[i];
// For calculating the opponent's shadow co-ordinates, the original StuntCarRacer spans are slightly
// too big, so need to be reduced to take into account the greater width of sloped segments
long xd = right_side_x - left_side_x;
long yd = (sy3 - sy2) / LOCAL_Y_FACTOR;
long zd = right_side_z - left_side_z;
long base_width = (long)(sqrt((double)((xd*xd) + (zd*zd))));
long slope_width = (long)(sqrt((double)((base_width*base_width) + (yd*yd))));
long opponents_shadow_x_span = (opponents_x_span * base_width) / slope_width;
// if (!bTestKey)
// opponents_shadow_x_span = opponents_x_span;
long sx, sz;
sz = distance & 0xff; // z position of rear wheels
// Calculate rear left road co-ordinate (as per Amiga opp.rear.left.road.height)
sx = opponents_road_x_position - opponents_x_span; // x position of rear left wheel
CalculateOpponentsRoadWheelHeight(sx, sz, &opp_rear_left_road_pos.y);
opp_rear_left_road_pos.x = left_side_x + ((sx * xd) >> 8);
opp_rear_left_road_pos.z = left_side_z + ((sx * zd) >> 8);
#ifdef TEST_AMIGA_RWP
CompareRecordedAmigaWord("opp.rear.left.road.height", &opp_rear_left_road_pos.y);
#endif
// Calculate rear left shadow co-ordinate
sx = opponents_road_x_position - opponents_shadow_x_span;
CalculateOpponentsRoadWheelHeight(sx, sz, &opp_shadow_rear_left.y);
opp_shadow_rear_left.x = left_side_x + ((sx * xd) >> 8);
opp_shadow_rear_left.z = left_side_z + ((sx * zd) >> 8);
// Calculate rear right road co-ordinate (as per Amiga opp.rear.right.road.height)
sx = opponents_road_x_position + opponents_x_span; // x position of rear right wheel
CalculateOpponentsRoadWheelHeight(sx, sz, &opp_rear_right_road_pos.y);
opp_rear_right_road_pos.x = left_side_x + ((sx * xd) >> 8);
opp_rear_right_road_pos.z = left_side_z + ((sx * zd) >> 8);
#ifdef TEST_AMIGA_RWP
CompareRecordedAmigaWord("opp.rear.right.road.height", &opp_rear_right_road_pos.y);
#endif
// Calculate rear right shadow co-ordinate
sx = opponents_road_x_position + opponents_shadow_x_span;
CalculateOpponentsRoadWheelHeight(sx, sz, &opp_shadow_rear_right.y);
opp_shadow_rear_right.x = left_side_x + ((sx * xd) >> 8);
opp_shadow_rear_right.z = left_side_z + ((sx * zd) >> 8);
long piece_x, piece_y, piece_z;
// Calculate position of piece's bottom front left corner, within world
piece_x = Track[piece].x << (LOG_CUBE_SIZE-LOG_PRECISION);
piece_y = Track[piece].y << (LOG_CUBE_SIZE-LOG_PRECISION);
piece_z = Track[piece].z << (LOG_CUBE_SIZE-LOG_PRECISION);
// Position rear road co-ordinates within world
opp_rear_left_road_pos.x += piece_x;
opp_rear_right_road_pos.x += piece_x;
opp_rear_left_road_pos.z += piece_z;
opp_rear_right_road_pos.z += piece_z;
// Position rear shadow co-ordinates within world
opp_shadow_rear_left.x += piece_x;
opp_shadow_rear_right.x += piece_x;
opp_shadow_rear_left.z += piece_z;
opp_shadow_rear_right.z += piece_z;
//****************
#ifdef USE_OPP_CENTRE_POS
long cdistance = opponents_distance_into_section;
// Fetch 4 surface co-ords surrounding centre point
segment = cdistance >> 8;
GetSurfaceCoords(opponents_current_piece, segment);
surface_position = cdistance & 0xff;
left_side_x = sx2 + ((surface_position * (sx1-sx2)) >> 8);
left_side_z = sz2 + ((surface_position * (sz1-sz2)) >> 8);
right_side_x = sx3 + ((surface_position * (sx4-sx3)) >> 8);
right_side_z = sz3 + ((surface_position * (sz4-sz3)) >> 8);
sx = opponents_road_x_position & 0xff; // x position of front wheel
// Calculate centre road x,z co-ordinates
opp_centre_road_pos.x = left_side_x + ((sx * (right_side_x-left_side_x)) >> 8);
opp_centre_road_pos.z = left_side_z + ((sx * (right_side_z-left_side_z)) >> 8);
// Calculate position of piece's bottom front left corner, within world
piece_x = Track[opponents_current_piece].x << (LOG_CUBE_SIZE-LOG_PRECISION);
piece_z = Track[opponents_current_piece].z << (LOG_CUBE_SIZE-LOG_PRECISION);
// Position centre road co-ordinates within world
opp_centre_road_pos.x += piece_x;
opp_centre_road_pos.z += piece_z;
#endif
//****************
/*
* Front wheels
*/
long diff, xdiff, zdiff;
// Calculate front left and right road x,z co-ordinates
diff = opp_rear_right_road_pos.x - opp_rear_left_road_pos.x;
xdiff = diff + (diff >> 1); // car length is 1.5 times width
diff = opp_rear_right_road_pos.z - opp_rear_left_road_pos.z;
zdiff = diff + (diff >> 1); // car length is 1.5 times width
opp_front_left_road_pos.x = opp_rear_left_road_pos.x - zdiff;
opp_front_left_road_pos.z = opp_rear_left_road_pos.z + xdiff;
opp_front_right_road_pos.x = opp_rear_right_road_pos.x - zdiff;
opp_front_right_road_pos.z = opp_rear_right_road_pos.z + xdiff;
/* Don't need to add piece_x,piece_z as already have world position (from rear wheels) */
// Calculate front left and right shadow x,z co-ordinates
diff = opp_shadow_rear_right.x - opp_shadow_rear_left.x;
xdiff = diff + (diff >> 1); // car length is 1.5 times width
diff = opp_shadow_rear_right.z - opp_shadow_rear_left.z;
zdiff = diff + (diff >> 1); // car length is 1.5 times width
opp_shadow_front_left.x = opp_shadow_rear_left.x - zdiff;
opp_shadow_front_left.z = opp_shadow_rear_left.z + xdiff;
opp_shadow_front_right.x = opp_shadow_rear_right.x - zdiff;
opp_shadow_front_right.z = opp_shadow_rear_right.z + xdiff;
/* Don't need to add piece_x,piece_z as already have world position (from rear wheels) */
// Add 128 to get z of opponent's front
distance += 128;
if (distance >= (Track[piece].numSegments * 256))
{
// DIRECTION DEPENDANT
distance -= (Track[piece].numSegments * 256);
// go to next piece
piece++; if (piece > (NumTrackPieces - 1)) piece = 0;
}
// Fetch 4 surface co-ords surrounding front wheels
segment = distance >> 8;
GetSurfaceCoords(piece, segment);
// Don't draw opponent's shadow on black road segments
if (Track[piece].roadColour[segment] == SCR_BASE_COLOUR + 0)
draw_shadow = FALSE;
/* temporary code
#ifdef TEST_AMIGA_RWP
long tsx, tsz, ty1, ty2, ty3, ty4;
GetRecordedAmigaWord(&tsx);
GetRecordedAmigaWord(&tsz);
GetRecordedAmigaWord(&ty1);
GetRecordedAmigaWord(&ty2);
GetRecordedAmigaWord(&ty3);
GetRecordedAmigaWord(&ty4);
#endif
*/
sz = distance & 0xff; // z position of front wheel
sx = opponents_road_x_position & 0xff; // x position of front wheel
// Calculate front road y co-ordinate (as per Amiga opp.front.road.height)
CalculateOpponentsRoadWheelHeight(sx, sz, &opp_front_road_pos_y);
#ifdef TEST_AMIGA_RWP
CompareRecordedAmigaWord("opp.front.road.height", &opp_front_road_pos_y);
#endif
// Calculate front left road y co-ordinate
sx = opponents_road_x_position - opponents_x_span; // x position of front left wheel
CalculateOpponentsRoadWheelHeight(sx, sz, &opp_front_left_road_pos.y);
// Calculate front right road y co-ordinate
sx = opponents_road_x_position + opponents_x_span; // x position of front right wheel
CalculateOpponentsRoadWheelHeight(sx, sz, &opp_front_right_road_pos.y);
#ifdef CALC_FRONT_X_Z_FROM_SCRATCH
VALUE1 = VALUE2 = 0;
if (bTestKey)
{
VALUE1 = opp_front_right_road_pos.x;
surface_position = sz;
left_side_x = sx2 + ((surface_position * (sx1-sx2)) >> 8);
left_side_z = sz2 + ((surface_position * (sz1-sz2)) >> 8);
right_side_x = sx3 + ((surface_position * (sx4-sx3)) >> 8);
right_side_z = sz3 + ((surface_position * (sz4-sz3)) >> 8);
xd = right_side_x - left_side_x;
zd = right_side_z - left_side_z;
sx = opponents_road_x_position - opponents_x_span; // x position of front left wheel
opp_front_left_road_pos.x = left_side_x + ((sx * xd) >> 8);
opp_front_left_road_pos.z = left_side_z + ((sx * zd) >> 8);
sx = opponents_road_x_position + opponents_x_span; // x position of front right wheel
opp_front_right_road_pos.x = left_side_x + ((sx * xd) >> 8);
opp_front_right_road_pos.z = left_side_z + ((sx * zd) >> 8);
// Calculate position of piece's bottom front left corner, within world
piece_x = Track[piece].x << (LOG_CUBE_SIZE-LOG_PRECISION);
piece_y = Track[piece].y << (LOG_CUBE_SIZE-LOG_PRECISION);
piece_z = Track[piece].z << (LOG_CUBE_SIZE-LOG_PRECISION);
// Position front road co-ordinates within world
opp_front_left_road_pos.x += piece_x;
opp_front_left_road_pos.z += piece_z;
opp_front_right_road_pos.x += piece_x;
opp_front_right_road_pos.z += piece_z;
VALUE2 = opp_front_right_road_pos.x;
}
#endif
#ifdef OPPONENT_SHADOW
// Calculate front left shadow y co-ordinate
sx = opponents_road_x_position - opponents_shadow_x_span;
CalculateOpponentsRoadWheelHeight(sx, sz, &opp_shadow_front_left.y);
// Calculate front right shadow y co-ordinate
sx = opponents_road_x_position + opponents_shadow_x_span;
CalculateOpponentsRoadWheelHeight(sx, sz, &opp_shadow_front_right.y);
// Y co-ordinates need to be divided by 4 for display, but they're
// already /2 because are in Amiga format (i.e. not * PC_FACTOR).
// Also add 7 to y so that shadow is slightly above road and isn't clipped as much
D3DXVECTOR3 v1, v2, v3, v4;
v2 = D3DXVECTOR3( (float)opp_shadow_rear_left.x, 7 + (float)opp_shadow_rear_left.y/2, (float)opp_shadow_rear_left.z );
v3 = D3DXVECTOR3( (float)opp_shadow_rear_right.x, 7 + (float)opp_shadow_rear_right.y/2, (float)opp_shadow_rear_right.z );
v1 = D3DXVECTOR3( (float)opp_shadow_front_left.x, 7 + (float)opp_shadow_front_left.y/2, (float)opp_shadow_front_left.z );
v4 = D3DXVECTOR3( (float)opp_shadow_front_right.x, 7 + (float)opp_shadow_front_right.y/2, (float)opp_shadow_front_right.z );
RemoveShadowTriangles();
if (draw_shadow)
{
StoreShadowTriangle(v2, v1, v3, 0);
StoreShadowTriangle(v1, v4, v3, 0);
}
#endif
// VALUE1 = opp_rear_left_road_pos.y;
// VALUE2 = opp_front_road_pos_y;
// VALUE3 = opp_rear_right_road_pos.y;
return;
}
static void GetSurfaceCoords( long piece, long segment )
{
if ((segment < 0) || (segment >= Track[piece].numSegments))
{
MessageBox(NULL, L"GetSurfaceCoords(opponent) segment out of range", L"Error", MB_OK);
#if defined(DEBUG) || defined(_DEBUG)
fprintf(out, "GetSurfaceCoords(opponent) piece %d, segment %d, numSegments %d\n", piece, segment, Track[piece].numSegments);
#endif
}
sx2 = Track[piece].coords[(segment*4)].x;
sy2 = Track[piece].coords[(segment*4)].y;
sz2 = Track[piece].coords[(segment*4)].z;
sx3 = Track[piece].coords[(segment*4)+1].x;
sy3 = Track[piece].coords[(segment*4)+1].y;
sz3 = Track[piece].coords[(segment*4)+1].z;
segment++;
sx1 = Track[piece].coords[(segment*4)].x;
sy1 = Track[piece].coords[(segment*4)].y;
sz1 = Track[piece].coords[(segment*4)].z;
sx4 = Track[piece].coords[(segment*4)+1].x;
sy4 = Track[piece].coords[(segment*4)+1].y;
sz4 = Track[piece].coords[(segment*4)+1].z;
return;
}
static long CalcSurfacePosition( long *next_segment, long distance, long z_shift )
{
long surface_position = distance & 0xff;
*next_segment = FALSE;
surface_position += z_shift;
if (surface_position >= 256)
{
*next_segment = TRUE;
surface_position &= 0xff;
}
return(surface_position);
}
static void CalculateOpponentsRoadWheelHeight( long sx, long sz, long *y_out )
{
long sya, syb, y;
// calculate height of surface at x,z position using linear interpolation
// i.e. calculate y at offset (sx, sz)
// given (sx1, sy1, sz1)
// (sx2, sy2, sz2)
// (sx3, sy3, sz3)
// (sx4, sy4, sz4)
// first do x interpolation
sya = sy1 + ((sx * (sy4-sy1)) >> 8);
syb = sy2 + ((sx * (sy3-sy2)) >> 8);
// now do z interpolation
y = (syb << 8) + (sz * (sya-syb));
*y_out = y >> 9;
return;
}
/* ======================================================================================= */
/* Function: OpponentMovement */
/* */
/* Description: */
/* ======================================================================================= */
extern bool drop_start_done;
// Tested against Amiga
static void OpponentMovement( void )
{
static long byte_count = 0;
if (!drop_start_done)
return;
UpdateOpponentsActualWheelHeights();
/*
//temp
opp_actual_height[REAR_LEFT] = opp_rear_left_road_pos.y;
opp_actual_height[REAR_RIGHT] = opp_rear_right_road_pos.y;
opp_actual_height[FRONT] = opp_front_road_pos_y;
*/
RandomizeOpponentsSteering();
GetOpponentsEngineAcceleration();
AdjustOpponentsEngineAcceleration();
#ifdef TEST_AMIGA_AOEA
long temp;
if (GetRecordedAmigaWord(&temp))
{
bool flag = temp & 0x80 ? TRUE : FALSE;
if (flag != opponents_required_z_speed_reached)
{
++VALUE1; // Count differences
fprintf(out, "%s different %d %d (VALUE2 %d)\n", "opponents.required.z.speed.reached", temp, opponents_required_z_speed_reached, VALUE2);
opponents_required_z_speed_reached = flag; // Use Amiga value when different
}
}
CompareRecordedAmigaWord("opponents.engine.z.acceleration", &opponents_engine_z_acceleration);
#endif
UpdateOpponentsZSpeed();
#ifdef TEST_AMIGA_OM
if (GetRecordedAmigaWord(&opponents_z_speed))
++VALUE2;
GetRecordedAmigaWord(&opponents_current_piece);
GetRecordedAmigaWord(&byte_count);
GetRecordedAmigaWord(&opponents_distance_into_section);
#endif
// TO DO: Tidy up
long value = (opponents_z_speed * (Track[opponents_current_piece].lengthReduction << 7)) << 1;
value >>= 16;
value *= REDUCTION;
value >>= 8;
value <<= 3;
long byte = value & 0xff;
value >>= 8;
byte_count += byte;
if (byte_count > 0xff)
{
++value;
byte_count &= 0xff;
}
opponents_distance_into_section += value;
if (opponents_distance_into_section >= (Track[opponents_current_piece].numSegments * 256))
{
// DIRECTION DEPENDANT
opponents_distance_into_section -= (Track[opponents_current_piece].numSegments * 256);
// go to next piece
opponents_current_piece++;
if (opponents_current_piece > (NumTrackPieces - 1)) opponents_current_piece = 0;
}
#ifdef TEST_AMIGA_OM
CompareRecordedAmigaWord("opponents.road.section", &opponents_current_piece);
CompareRecordedAmigaWord("opponents.distance.into.section", &opponents_distance_into_section);
#endif
}
/* ======================================================================================= */
/* Function: UpdateOpponentsActualWheelHeights */
/* */
/* Description: */
/* ======================================================================================= */
// Tested against Amiga
static void UpdateOpponentsActualWheelHeights( void )
{
long height_adjust, touching_road, total_diff, i, acceleration, speed;
opp_smallest_difference = -32768;