Subversion Repositories Games.Rick Dangerous

/*

 * src/e_them.c

 *

 * Copyright (C) 1998-2002 BigOrno (bigorno@bigorno.net). All rights reserved.

 *

 * The use and distribution terms for this software are contained in the file

 * named README, which can be found in the root of this distribution. By

 * using this software in any fashion, you are agreeing to be bound by the

 * terms of this license.

 *

 * You must not remove this notice, or any other, from this software.

 */

#include "system.h"

#include "game.h"

#include "ents.h"

#include "e_them.h"

#include "e_rick.h"

#include "e_bomb.h"

#include "e_bullet.h"

#include "maps.h"

#include "util.h"

#define TYPE_1A (0x00)

#define TYPE_1B (0xff)

/*

 * public vars

 */

U32 e_them_rndseed = 0;

/*

 * local vars

 */

static U16 e_them_rndnbr = 0;

/*

 * Check if entity boxtests with a lethal e_them i.e. something lethal

 * in slot 0 and 4 to 8.

 *

 * ASM 122E

 *

 * e: entity slot number.

 * ret: TRUE/boxtests, FALSE/not

 */

U8 u_themtest (U8 e)

{

   U8 i;

   if ((ent_ents[0].n & ENT_LETHAL) && u_boxtest (e, 0))

      return TRUE;

   for (i = 4; i < 9; i++)

      if ((ent_ents[i].n & ENT_LETHAL) && u_boxtest (e, i))

         return TRUE;

   return FALSE;

}

/*

 * Go zombie

 *

 * ASM 237B

 */

void e_them_gozombie (U8 e)

{

#define offsx c1

   ent_ents[e].n = 0x47;   /* zombie entity */

   ent_ents[e].front = TRUE;

   ent_ents[e].offsy = -0x0400;

   syssnd_play(WAV_DIE, 1);

   game_score += 50;

   if (ent_ents[e].flags & ENT_FLG_ONCE)

   {

      /* make sure entity won't be activated again */

      map_marks[ent_ents[e].mark].ent |= MAP_MARK_NACT;

   }

   ent_ents[e].offsx = (ent_ents[e].x >= 0x80 ? -0x02 : 0x02);

#undef offsx

}

/*

 * Action sub-function for e_them _t1a and _t1b

 *

 * Those two types move horizontally, and fall if they have to.

 * Type 1a moves horizontally over a given distance and then

 * u-turns and repeats; type 1b is more subtle as it does u-turns

 * in order to move horizontally towards rick.

 *

 * ASM 2242

 */

void e_them_t1_action2 (U8 e, U8 type)

{

#define offsx c1

#define step_count c2

   U32 i;

   S16 x, y;

   U8 env0, env1;

   /* by default, try vertical move. calculate new y */

   i = (ent_ents[e].y << 8) + ent_ents[e].offsy + ent_ents[e].ylow;

   y = (S16) (i >> 8);

   /* deactivate if outside vertical boundaries */

   /* no need to test zero since e_them _t1a/b don't go up */

   /* FIXME what if they got scrolled out ? */

   if (y > 0x140)

   {

      ent_ents[e].n = 0;

      return;

   }

   /* test environment */

   u_envtest (ent_ents[e].x, y, FALSE, &env0, &env1);

   if (!(env1 & (MAP_EFLG_VERT | MAP_EFLG_SOLID | MAP_EFLG_SPAD | MAP_EFLG_WAYUP)))

   {

      /* vertical move possible: falling */

      if (env1 & MAP_EFLG_LETHAL)

      {

         /* lethal entities kill e_them */

         e_them_gozombie (e);

         return;

      }

      /* save, cleanup and return */

      ent_ents[e].y = y;

      ent_ents[e].ylow = (U8) i;

      ent_ents[e].offsy += 0x0080;

      if (ent_ents[e].offsy > 0x0800)

         ent_ents[e].offsy = 0x0800;

      return;

   }

   /* vertical move not possible. calculate new sprite */

   ent_ents[e].sprite = ent_ents[e].sprbase + ent_sprseq[(ent_ents[e].x & 0x1c) >> 3] + (ent_ents[e].offsx < 0 ? 0x03 : 0x00);

   /* reset offsy */

   ent_ents[e].offsy = 0x0080;

   /* align to ground */

   ent_ents[e].y &= 0xfff8;

   ent_ents[e].y |= 0x0003;

   /* latency: if not zero then decrease and return */

   if (ent_ents[e].latency > 0)

   {

      ent_ents[e].latency--;

      return;

   }

   /* horizontal move. calculate new x */

   if (ent_ents[e].offsx == 0)   /* not supposed to move -> don't */

      return;

   x = ent_ents[e].x + ent_ents[e].offsx;

   if (ent_ents[e].x < 0x01 || ent_ents[e].x > 0xe8)

   {

      /* deactivate if reaching horizontal boundaries */

      ent_ents[e].n = 0;

      return;

   }

   /* test environment */

   u_envtest (x, ent_ents[e].y, FALSE, &env0, &env1);

   if (env1 & (MAP_EFLG_VERT|MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_WAYUP))

   {

      /* horizontal move not possible: u-turn and return */

      ent_ents[e].step_count = 0;

      ent_ents[e].offsx = -ent_ents[e].offsx;

      return;

   }

   /* horizontal move possible */

   if (env1 & MAP_EFLG_LETHAL)

   {

      /* lethal entities kill e_them */

      e_them_gozombie (e);

      return;

   }

   /* save */

   ent_ents[e].x = x;

   /* depending on type, */

   if (type == TYPE_1B)

   {

      /* set direction to move horizontally towards rick */

      if ((ent_ents[e].x & 0x1e) != 0x10) /* prevents too frequent u-turns */

         return;

      ent_ents[e].offsx = (ent_ents[e].x < E_RICK_ENT.x) ? 0x02 : -0x02;

      return;

   }

   else

   {

      /* set direction according to step counter */

      ent_ents[e].step_count++;

      /* FIXME why trig_x (b16) ?? */

      if ((ent_ents[e].trig_x >> 1) > ent_ents[e].step_count)

         return;

      /* type is 1A and step counter reached its limit: u-turn */

      ent_ents[e].step_count = 0;

      ent_ents[e].offsx = -ent_ents[e].offsx;

   }

#undef offsx

#undef step_count

}

/*

 * ASM 21CF

 */

void e_them_t1_action (U8 e, U8 type)

{

   e_them_t1_action2 (e, type);

   /* lethal entities kill them */

   if (u_themtest (e))

   {

      e_them_gozombie (e);

      return;

   }

   /* bullet kills them */

   if (E_BULLET_ENT.n && u_fboxtest (e, (S16) (E_BULLET_ENT.x + (e_bullet_offsx < 0 ? 0 : 0x18)), E_BULLET_ENT.y))

   {

      E_BULLET_ENT.n = 0;

      e_them_gozombie (e);

      return;

   }

   /* bomb kills them */

   if (e_bomb_lethal && e_bomb_hit (e))

   {

      e_them_gozombie (e);

      return;

   }

   if (E_RICK_STTST (E_RICK_STZOMBIE))

      return;

   /* rick stops them */

   if (E_RICK_STTST (E_RICK_STSTOP) && u_fboxtest (e, e_rick_stop_x, e_rick_stop_y))

      ent_ents[e].latency = 0x14;

   /* they kill rick */

   if (e_rick_boxtest (e))

      e_rick_gozombie ();

}

/*

 * Action function for e_them _t1a type (stays within boundaries)

 *

 * ASM 2452

 */

void e_them_t1a_action (U8 e)

{

   e_them_t1_action (e, TYPE_1A);

}

/*

 * Action function for e_them _t1b type (runs for rick)

 *

 * ASM 21CA

 */

void e_them_t1b_action (U8 e)

{

   e_them_t1_action (e, TYPE_1B);

}

/*

 * Action function for e_them _z (zombie) type

 *

 * ASM 23B8

 */

void e_them_z_action (U8 e)

{

#define offsx c1

   U32 i;

   /* calc new sprite */

   ent_ents[e].sprite = ent_ents[e].sprbase + ((ent_ents[e].x & 0x04) ? 0x07 : 0x06);

   /* calc new y */

   i = (ent_ents[e].y << 8) + ent_ents[e].offsy + ent_ents[e].ylow;

   /* deactivate if out of vertical boundaries */

   if (ent_ents[e].y < 0 || ent_ents[e].y > 0x0140)

   {

      ent_ents[e].n = 0;

      return;

   }

   /* save */

   ent_ents[e].offsy += 0x0080;

   ent_ents[e].ylow = (U8) i;

   ent_ents[e].y = (S16) (i >> 8);

   /* calc new x */

   ent_ents[e].x += ent_ents[e].offsx;

   /* must stay within horizontal boundaries */

   if (ent_ents[e].x < 0)

      ent_ents[e].x = 0;

   if (ent_ents[e].x > 0xe8)

      ent_ents[e].x = 0xe8;

#undef offsx

}

/*

 * Action sub-function for e_them _t2.

 *

 * Must document what it does.

 *

 * ASM 2792

 */

void e_them_t2_action2 (U8 e)

{

#define flgclmb c1

#define offsx c2

   U32 i;

   S16 x, y, yd;

   U8 env0, env1;

   /*

    * vars required by the Black Magic (tm) performance at the

    * end of this function.

    */

   static U16 bx;

   static U8 *bl = (U8 *)&bx;

   static U8 *bh = (U8 *)&bx + 1;

   static U16 cx;

   static U8 *cl = (U8 *)&cx;

   static U8 *ch = (U8 *)&cx + 1;

   static U16 *sl = (U16 *)&e_them_rndseed;

   static U16 *sh = (U16 *)&e_them_rndseed + 2;

   /*sys_printf("e_them_t2 ------------------------------\n");*/

   /* latency: if not zero then decrease */

   if (ent_ents[e].latency > 0)

      ent_ents[e].latency--;

   /* climbing? */

   if (ent_ents[e].flgclmb != TRUE)

      goto climbing_not;

   /* CLIMBING */

   /*sys_printf("e_them_t2 climbing\n");*/

   /* latency: if not zero then return */

   if (ent_ents[e].latency > 0)

      return;

   /* calc new sprite */

   ent_ents[e].sprite = ent_ents[e].sprbase + 0x08 + (((ent_ents[e].x ^ ent_ents[e].y) & 0x04) ? 1 : 0);

   /* reached rick's level? */

   if ((ent_ents[e].y & 0xfe) != (E_RICK_ENT.y & 0xfe))

      goto ymove;

xmove:

      /* calc new x and test environment */

      ent_ents[e].offsx = (ent_ents[e].x < E_RICK_ENT.x) ? 0x02 : -0x02;

      x = ent_ents[e].x + ent_ents[e].offsx;

      u_envtest (x, ent_ents[e].y, FALSE, &env0, &env1);

      if (env1 & (MAP_EFLG_SOLID | MAP_EFLG_SPAD | MAP_EFLG_WAYUP))

         return;

      if (env1 & MAP_EFLG_LETHAL)

      {

         e_them_gozombie(e);

         return;

      }

      ent_ents[e].x = x;

      if (env1 & (MAP_EFLG_VERT | MAP_EFLG_CLIMB))   /* still climbing */

         return;

      goto climbing_not;   /* not climbing anymore */

ymove:

      /* calc new y and test environment */

      yd = ent_ents[e].y < E_RICK_ENT.y ? 0x02 : -0x02;

      y = ent_ents[e].y + yd;

      if (y < 0 || y > 0x0140)

      {

         ent_ents[e].n = 0;

         return;

      }

      u_envtest (ent_ents[e].x, y, FALSE, &env0, &env1);

      if (env1 & (MAP_EFLG_SOLID | MAP_EFLG_SPAD | MAP_EFLG_WAYUP))

      {

         if (yd < 0)

            goto xmove;   /* can't go up */

         else

            goto climbing_not;   /* can't go down */

      }

      /* can move */

      ent_ents[e].y = y;

      if (env1 & (MAP_EFLG_VERT | MAP_EFLG_CLIMB))   /* still climbing */

         return;

      /* NOT CLIMBING */

climbing_not:

      /*sys_printf ("e_them_t2 climbing NOT\n");*/

      ent_ents[e].flgclmb = FALSE;   /* not climbing */

      /* calc new y (falling) and test environment */

      i = (ent_ents[e].y << 8) + ent_ents[e].offsy + ent_ents[e].ylow;

      y = (S16) (i >> 8);

      u_envtest (ent_ents[e].x, y, FALSE, &env0, &env1);

      if (!(env1 & (MAP_EFLG_SOLID | MAP_EFLG_SPAD | MAP_EFLG_WAYUP)))

      {

         /*sys_printf ("e_them_t2 y move OK\n");*/

         /* can go there */

         if (env1 & MAP_EFLG_LETHAL)

         {

            e_them_gozombie (e);

            return;

         }

         if (y > 0x0140)

         {

            /* deactivate if outside */

            ent_ents[e].n = 0;

            return;

         }

         if (!(env1 & MAP_EFLG_VERT))

         {

            /* save */

            ent_ents[e].y = y;

            ent_ents[e].ylow = (U8) i;

            ent_ents[e].offsy += 0x0080;

            if (ent_ents[e].offsy > 0x0800)

               ent_ents[e].offsy = 0x0800;

            return;

         }

         if (((ent_ents[e].x & 0x07) == 0x04) && (y < E_RICK_ENT.y))

         {

            /*sys_printf ("e_them_t2 climbing00\n");*/

            ent_ents[e].flgclmb = TRUE;   /* climbing */

            return;

         }

      }

      /*sys_printf("e_them_t2 ymove nok or ...\n");*/

      /* can't go there, or ... */

      ent_ents[e].y = (ent_ents[e].y & 0xf8) | 0x03;   /* align to ground */

      ent_ents[e].offsy = 0x0100;

      if (ent_ents[e].latency != 00)

         return;

      if ((env1 & MAP_EFLG_CLIMB) && ((ent_ents[e].x & 0x0e) == 0x04) && (ent_ents[e].y > E_RICK_ENT.y))

      {

         /*sys_printf ("e_them_t2 climbing01\n");*/

         ent_ents[e].flgclmb = TRUE;   /* climbing */

         return;

      }

      /* calc new sprite */

      ent_ents[e].sprite = ent_ents[e].sprbase + ent_sprseq[(ent_ents[e].offsx < 0 ? 4 : 0) + ((ent_ents[e].x & 0x0e) >> 3)];

      /*sys_printf ("e_them_t2 sprite %02x\n", ent_ents[e].sprite);*/

      /* */

      if (ent_ents[e].offsx == 0)

         ent_ents[e].offsx = 2;

      x = ent_ents[e].x + ent_ents[e].offsx;

      /*sys_printf ("e_them_t2 xmove x=%02x\n", x);*/

      if (x < 0xe8)

      {

         u_envtest (x, ent_ents[e].y, FALSE, &env0, &env1);

         if (!(env1 & (MAP_EFLG_VERT | MAP_EFLG_SOLID | MAP_EFLG_SPAD | MAP_EFLG_WAYUP)))

         {

            ent_ents[e].x = x;

            if ((x & 0x1e) != 0x08)

               return;

            /*

             * Black Magic (tm)

             *

             * this is obviously some sort of randomizer to define a direction

             * for the entity. it is an exact copy of what the assembler code

             * does but I can't explain.

             */

            bx = e_them_rndnbr + *sh + *sl + 0x0d;

            cx = *sh;

            *bl ^= *ch;

            *bl ^= *cl;

            *bl ^= *bh;

            e_them_rndnbr = bx;

            ent_ents[e].offsx = (*bl & 0x01) ? -0x02 : 0x02;

            /* back to normal */

            return;

         }

      }

      /* U-turn */

      /*sys_printf ("e_them_t2 u-turn\n");*/

      if (ent_ents[e].offsx == 0)

         ent_ents[e].offsx = 2;

      else

         ent_ents[e].offsx = -ent_ents[e].offsx;

#undef offsx

}

/*

 * Action function for e_them _t2 type

 *

 * ASM 2718

 */

void e_them_t2_action (U8 e)

{

   e_them_t2_action2 (e);

   /* they kill rick */

   if (e_rick_boxtest (e))

      e_rick_gozombie ();

   /* lethal entities kill them */

   if (u_themtest (e))

   {

      e_them_gozombie (e);

      return;

   }

   /* bullet kills them */

   if (E_BULLET_ENT.n && u_fboxtest (e, (S16) (E_BULLET_ENT.x + (e_bullet_offsx < 0 ? 00 : 0x18)), E_BULLET_ENT.y))

   {

      E_BULLET_ENT.n = 0;

      e_them_gozombie (e);

      return;

   }

   /* bomb kills them */

   if (e_bomb_lethal && e_bomb_hit (e))

   {

      e_them_gozombie (e);

      return;

   }

   /* rick stops them */

   if (E_RICK_STTST (E_RICK_STSTOP) && u_fboxtest (e, e_rick_stop_x, e_rick_stop_y))

      ent_ents[e].latency = 0x14;

}

/*

 * Action sub-function for e_them _t3

 *

 * FIXME always starts asleep??

 *

 * Waits until triggered by something, then execute move steps from

 * ent_mvstep with sprite from ent_sprseq. When done, either restart

 * or disappear.

 *

 * Not always lethal ... but if lethal, kills rick.

 *

 * ASM: 255A

 */

void e_them_t3_action2 (U8 e)

{

#define sproffs c1

#define step_count c2

   U8 i;

   S16 x, y;

   while (1)

   {

      /* calc new sprite */

      i = ent_sprseq[ent_ents[e].sprbase + ent_ents[e].sproffs];

      if (i == 0xff)

         i = ent_sprseq[ent_ents[e].sprbase];

      ent_ents[e].sprite = i;

      if (ent_ents[e].sproffs != 0)

      {

         /* awake */

         /* rotate sprseq */

         if (ent_sprseq[ent_ents[e].sprbase + ent_ents[e].sproffs] != 0xff)

            ent_ents[e].sproffs++;

         if (ent_sprseq[ent_ents[e].sprbase + ent_ents[e].sproffs] == 0xff)

            ent_ents[e].sproffs = 1;

         if (ent_ents[e].step_count < ent_mvstep[ent_ents[e].step_no].count)

         {

            /*

             * still running this step: try to increment x and y while

             * checking that they remain within boudaries. if so, return.

             * else switch to next step.

             */

            ent_ents[e].step_count++;

            x = ent_ents[e].x + ent_mvstep[ent_ents[e].step_no].dx;

            /* check'n save */

            if (x > 0 && x < 0xe8)

            {

               ent_ents[e].x = x;

               /*FIXME*/

               /*

               y = ent_mvstep[ent_ents[e].step_no].dy;

               if (y < 0)

               y += 0xff00;

               y += ent_ents[e].y;

               */

               y = ent_ents[e].y + ent_mvstep[ent_ents[e].step_no].dy;

               if (y > 0 && y < 0x0140)

               {

                  ent_ents[e].y = y;

                  return;

               }

            }

         }

         /*

          * step is done, or x or y is outside boundaries. try to

          * switch to next step

          */

         ent_ents[e].step_no++;

         if (ent_mvstep[ent_ents[e].step_no].count != 0xff)

            ent_ents[e].step_count = 0; // there is a next step: init and loop

         else

         {

            /* there is no next step: restart or deactivate */

            if (!E_RICK_STTST (E_RICK_STZOMBIE) && !(ent_ents[e].flags & ENT_FLG_ONCE))

            {

               /* loop this entity */

               ent_ents[e].sproffs = 0;

               ent_ents[e].n &= ~ENT_LETHAL;

               if (ent_ents[e].flags & ENT_FLG_LETHALR)

                  ent_ents[e].n |= ENT_LETHAL;

               ent_ents[e].x = ent_ents[e].xsave;

               ent_ents[e].y = ent_ents[e].ysave;

               if (ent_ents[e].y < 0 || ent_ents[e].y > 0x140)

               {

                  ent_ents[e].n = 0;

                  return;

               }

            }

            else

            {

               /* deactivate this entity */

               ent_ents[e].n = 0;

               return;

            }

         }

      }

      else

      {

         /* ent_ents[e].sprseq1 == 0 -- waiting */

         /* ugly GOTOs */

         /* reacts to rick */

         if (ent_ents[e].flags & ENT_FLG_TRIGRICK)

         {

            /* wake up if triggered by rick */

            if (u_trigbox (e, (S16) (E_RICK_ENT.x + 0x0C), (S16) (E_RICK_ENT.y + 0x0A)))

               goto wakeup;

         }

         /* reacts to rick "stop" */

         if (ent_ents[e].flags & ENT_FLG_TRIGSTOP)

         {

            /* wake up if triggered by rick "stop" */

            if (E_RICK_STTST(E_RICK_STSTOP) && u_trigbox (e, e_rick_stop_x, e_rick_stop_y))

               goto wakeup;

         }

         /* reacts to bullets */

         if (ent_ents[e].flags & ENT_FLG_TRIGBULLET)

         {

            /* wake up if triggered by bullet */

            if (E_BULLET_ENT.n && u_trigbox(e, e_bullet_xc, e_bullet_yc))

            {

               E_BULLET_ENT.n = 0;

               goto wakeup;

            }

         }

         /* reacts to bombs */

         if (ent_ents[e].flags & ENT_FLG_TRIGBOMB)

         {

            /* wake up if triggered by bomb */

            if (e_bomb_lethal && u_trigbox(e, e_bomb_xc, e_bomb_yc))

               goto wakeup;

         }

         /* not triggered: keep waiting */

         return;

         /* something triggered the entity: wake up */

         /* initialize step counter */

wakeup:

         if (E_RICK_STTST (E_RICK_STZOMBIE))

            return;

         /*

          * FIXME the sound should come from a table, there are 10 of them

          * but I dont have the table yet. must rip the data off the game...

          * FIXME is it 8 of them, not 10?

          * FIXME testing below...

          */

         if ((ent_ents[e].trigsnd & 0x1F) != 0)

            syssnd_play(WAV_ENTITY[(ent_ents[e].trigsnd & 0x1F) - 0x14], 1);

         ent_ents[e].n &= ~ENT_LETHAL;

         if (ent_ents[e].flags & ENT_FLG_LETHALI)

            ent_ents[e].n |= ENT_LETHAL;

         ent_ents[e].sproffs = 1;

         ent_ents[e].step_count = 0;

         ent_ents[e].step_no = ent_ents[e].step_no_i;

         return;

      }

   }

#undef step_count

}

/*

 * Action function for e_them _t3 type

 *

 * ASM 2546

 */

void e_them_t3_action (U8 e)

{

   e_them_t3_action2 (e);

   /* if lethal, can kill rick */

   if ((ent_ents[e].n & ENT_LETHAL) && !E_RICK_STTST (E_RICK_STZOMBIE) && e_rick_boxtest (e))

      e_rick_gozombie (); // CALL 1130

}