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xrick2gs/src/e_them.c

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/*
* xrick/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;
#ifdef IIGS
#pragma noroot
segment "e";
#endif
/*
* 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(ent_t* pEnt)
{
ent_t* pI;
if ((ent_ents[0].n & ENT_LETHAL) && u_boxtest(pEnt, ent_ents))
return TRUE;
for (pI = &ent_ents[4]; pI < &ent_ents[9]; pI++)
if ((pI->n & ENT_LETHAL) && u_boxtest(pEnt, pI))
return TRUE;
return FALSE;
}
/*
* Go zombie
*
* ASM 237B
*/
void
e_them_gozombie(ent_t* pEnt)
{
#define offsx c1
pEnt->n = 0x47; /* zombie entity */
pEnt->front = TRUE;
pEnt->offsy = -0x0400;
#ifdef ENABLE_SOUND
syssnd_play(WAV_DIE, 1);
#endif
game_score += 50;
if (pEnt->flags & ENT_FLG_ONCE) {
/* make sure entity won't be activated again */
map_marks[pEnt->mark].ent |= MAP_MARK_NACT;
}
pEnt->offsx = (pEnt->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(ent_t* pEnt, 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 = (((S32)pEnt->y) << 8) + ((S32)pEnt->offsy) + ((U32)pEnt->ylow);
y = 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) {
pEnt->n = 0;
return;
}
/* test environment */
u_envtest(pEnt->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(pEnt);
return;
}
/* save, cleanup and return */
pEnt->y = y;
pEnt->ylow = i;
pEnt->offsy += 0x0080;
if (pEnt->offsy > 0x0800)
pEnt->offsy = 0x0800;
return;
}
/* vertical move not possible. calculate new sprite */
pEnt->sprite = pEnt->sprbase
+ ent_sprseq[(pEnt->x & 0x1c) >> 3]
+ (pEnt->offsx < 0 ? 0x03 : 0x00);
/* reset offsy */
pEnt->offsy = 0x0080;
/* align to ground */
pEnt->y &= 0xfff8;
pEnt->y |= 0x0003;
/* latency: if not zero then decrease and return */
if (pEnt->latency > 0) {
pEnt->latency--;
return;
}
/* horizontal move. calculate new x */
if (pEnt->offsx == 0) /* not supposed to move -> don't */
return;
x = pEnt->x + pEnt->offsx;
if (pEnt->x < 0 || pEnt->x > 0xe8) {
/* U-turn and return if reaching horizontal boundaries */
pEnt->step_count = 0;
pEnt->offsx = -pEnt->offsx;
return;
}
/* test environment */
u_envtest(x, pEnt->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 */
pEnt->step_count = 0;
pEnt->offsx = -pEnt->offsx;
return;
}
/* horizontal move possible */
if (env1 & MAP_EFLG_LETHAL) {
/* lethal entities kill e_them */
e_them_gozombie(pEnt);
return;
}
/* save */
pEnt->x = x;
/* depending on type, */
if (type == TYPE_1B) {
/* set direction to move horizontally towards rick */
if ((pEnt->x & 0x1e) != 0x10) /* prevents too frequent u-turns */
return;
pEnt->offsx = (pEnt->x < E_RICK_ENT.x) ? 0x02 : -0x02;
return;
}
else {
/* set direction according to step counter */
pEnt->step_count++;
/* FIXME why trig_x (b16) ?? */
if ((pEnt->trig_x >> 1) > pEnt->step_count)
return;
}
/* type is 1A and step counter reached its limit: u-turn */
pEnt->step_count = 0;
pEnt->offsx = -pEnt->offsx;
#undef offsx
#undef step_count
}
/*
* ASM 21CF
*/
void
e_them_t1_action(ent_t* pEnt, U8 type)
{
e_them_t1_action2(pEnt, type);
/* lethal entities kill them */
if (u_themtest(pEnt)) {
e_them_gozombie(pEnt);
return;
}
/* bullet kills them */
if (E_BULLET_ENT.n &&
u_fboxtest(pEnt, E_BULLET_ENT.x + (e_bullet_offsx < 0 ? 0 : 0x18),
E_BULLET_ENT.y)) {
E_BULLET_ENT.n = 0;
e_them_gozombie(pEnt);
return;
}
/* bomb kills them */
if (e_bomb_lethal && e_bomb_hit(pEnt)) {
e_them_gozombie(pEnt);
return;
}
/* rick stops them */
if (E_RICK_STTST(E_RICK_STSTOP) &&
u_fboxtest(pEnt, e_rick_stop_x, e_rick_stop_y))
pEnt->latency = 0x14;
/* they kill rick */
if (e_rick_boxtest(pEnt))
e_rick_gozombie();
}
/*
* Action function for e_them _t1a type (stays within boundaries)
*
* ASM 2452
*/
void
e_them_t1a_action(ent_t* pEnt)
{
e_them_t1_action(pEnt, TYPE_1A);
}
/*
* Action function for e_them _t1b type (runs for rick)
*
* ASM 21CA
*/
void
e_them_t1b_action(ent_t* pEnt)
{
e_them_t1_action(pEnt, TYPE_1B);
}
/*
* Action function for e_them _z (zombie) type
*
* ASM 23B8
*/
void
e_them_z_action(ent_t* pEnt)
{
#define offsx c1
U32 i;
/* calc new sprite */
pEnt->sprite = pEnt->sprbase
+ ((pEnt->x & 0x04) ? 0x07 : 0x06);
/* calc new y */
i = (((S32)pEnt->y) << 8) + ((S32)pEnt->offsy) + ((U32)pEnt->ylow);
/* deactivate if out of vertical boundaries */
if (pEnt->y < 0 || pEnt->y > 0x0140) {
pEnt->n = 0;
return;
}
/* save */
pEnt->offsy += 0x0080;
pEnt->ylow = i;
pEnt->y = i >> 8;
/* calc new x */
pEnt->x += pEnt->offsx;
/* must stay within horizontal boundaries */
if (pEnt->x < 0)
pEnt->x = 0;
if (pEnt->x > 0xe8)
pEnt->x = 0xe8;
#undef offsx
}
/*
* Action sub-function for e_them _t2.
*
* Must document what it does.
*
* ASM 2792
*/
void
e_them_t2_action2(ent_t* pEnt)
{
#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;
U8 *bh = bl+1;
static U16 cx;
static U8 *cl = (U8*)&cx;
U8 *ch = cl+1;
static U16 *sl = (U16*)&e_them_rndseed;
U16 *sh = sl+1;
/*sys_printf("e_them_t2 ------------------------------\n");*/
/* latency: if not zero then decrease */
if (pEnt->latency > 0) pEnt->latency--;
/* climbing? */
if (pEnt->flgclmb != TRUE) goto climbing_not;
/* CLIMBING */
/*sys_printf("e_them_t2 climbing\n");*/
/* latency: if not zero then return */
if (pEnt->latency > 0) return;
/* calc new sprite */
pEnt->sprite = pEnt->sprbase + 0x08 +
(((pEnt->x ^ pEnt->y) & 0x04) ? 1 : 0);
/* reached rick's level? */
if ((pEnt->y & 0xfe) != (E_RICK_ENT.y & 0xfe)) goto ymove;
xmove:
/* calc new x and test environment */
pEnt->offsx = (pEnt->x < E_RICK_ENT.x) ? 0x02 : -0x02;
x = pEnt->x + pEnt->offsx;
u_envtest(x, pEnt->y, FALSE, &env0, &env1);
if (env1 & (MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_WAYUP))
return;
if (env1 & MAP_EFLG_LETHAL) {
e_them_gozombie(pEnt);
return;
}
pEnt->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 = pEnt->y < E_RICK_ENT.y ? 0x02 : -0x02;
y = pEnt->y + yd;
if (y < 0 || y > 0x0140) {
pEnt->n = 0;
return;
}
u_envtest(pEnt->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 */
pEnt->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");*/
pEnt->flgclmb = FALSE; /* not climbing */
/* calc new y (falling) and test environment */
i = (pEnt->y << 8) + pEnt->offsy + pEnt->ylow;
y = i >> 8;
u_envtest(pEnt->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(pEnt);
return;
}
if (y > 0x0140) { /* deactivate if outside */
pEnt->n = 0;
return;
}
if (!(env1 & MAP_EFLG_VERT)) {
/* save */
pEnt->y = y;
pEnt->ylow = i;
pEnt->offsy += 0x0080;
if (pEnt->offsy > 0x0800)
pEnt->offsy = 0x0800;
return;
}
if (((pEnt->x & 0x07) == 0x04) && (y < E_RICK_ENT.y)) {
/*sys_printf("e_them_t2 climbing00\n");*/
pEnt->flgclmb = TRUE; /* climbing */
return;
}
}
/*sys_printf("e_them_t2 ymove nok or ...\n");*/
/* can't go there, or ... */
pEnt->y = (pEnt->y & 0xf8) | 0x03; /* align to ground */
pEnt->offsy = 0x0100;
if (pEnt->latency != 00)
return;
if ((env1 & MAP_EFLG_CLIMB) &&
((pEnt->x & 0x0e) == 0x04) &&
(pEnt->y > E_RICK_ENT.y)) {
/*sys_printf("e_them_t2 climbing01\n");*/
pEnt->flgclmb = TRUE; /* climbing */
return;
}
/* calc new sprite */
pEnt->sprite = pEnt->sprbase +
ent_sprseq[(pEnt->offsx < 0 ? 4 : 0) +
((pEnt->x & 0x0e) >> 3)];
/*sys_printf("e_them_t2 sprite %02x\n", pEnt->sprite);*/
/* */
if (pEnt->offsx == 0)
pEnt->offsx = 2;
x = pEnt->x + pEnt->offsx;
/*sys_printf("e_them_t2 xmove x=%02x\n", x);*/
if (x < 0xe8) {
u_envtest(x, pEnt->y, FALSE, &env0, &env1);
if (!(env1 & (MAP_EFLG_VERT|MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_WAYUP))) {
pEnt->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;
pEnt->offsx = (*bl & 0x01) ? -0x02 : 0x02;
/* back to normal */
return;
}
}
/* U-turn */
/*sys_printf("e_them_t2 u-turn\n");*/
if (pEnt->offsx == 0)
pEnt->offsx = 2;
else
pEnt->offsx = -pEnt->offsx;
#undef offsx
}
/*
* Action function for e_them _t2 type
*
* ASM 2718
*/
void
e_them_t2_action(ent_t* pEnt)
{
e_them_t2_action2(pEnt);
/* they kill rick */
if (e_rick_boxtest(pEnt))
e_rick_gozombie();
/* lethal entities kill them */
if (u_themtest(pEnt)) {
e_them_gozombie(pEnt);
return;
}
/* bullet kills them */
if (E_BULLET_ENT.n &&
u_fboxtest(pEnt, E_BULLET_ENT.x + (e_bullet_offsx < 0 ? 00 : 0x18),
E_BULLET_ENT.y)) {
E_BULLET_ENT.n = 0;
e_them_gozombie(pEnt);
return;
}
/* bomb kills them */
if (e_bomb_lethal && e_bomb_hit(pEnt)) {
e_them_gozombie(pEnt);
return;
}
/* rick stops them */
if (E_RICK_STTST(E_RICK_STSTOP) &&
u_fboxtest(pEnt, e_rick_stop_x, e_rick_stop_y))
pEnt->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(ent_t* pEnt)
{
#define sproffs c1
#define step_count c2
U8 i;
S16 x, y;
while (1) {
/* calc new sprite */
i = ent_sprseq[pEnt->sprbase + pEnt->sproffs];
if (i == 0xff)
i = ent_sprseq[pEnt->sprbase];
pEnt->sprite = i;
if (pEnt->sproffs != 0) { /* awake */
/* rotate sprseq */
if (ent_sprseq[pEnt->sprbase + pEnt->sproffs] != 0xff)
pEnt->sproffs++;
if (ent_sprseq[pEnt->sprbase + pEnt->sproffs] == 0xff)
pEnt->sproffs = 1;
if (pEnt->step_count < ent_mvstep[pEnt->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.
*/
pEnt->step_count++;
x = pEnt->x + ((S16)(ent_mvstep[pEnt->step_no].dx));
/* check'n save */
if (x > 0 && x < 0xe8) {
pEnt->x = x;
/*FIXME*/
/*
y = ent_mvstep[pEnt->step_no].dy;
if (y < 0)
y += 0xff00;
y += pEnt->y;
*/
y = pEnt->y + ((S16)(ent_mvstep[pEnt->step_no].dy));
if (y > 0 && y < 0x0140) {
pEnt->y = y;
return;
}
}
}
/*
* step is done, or x or y is outside boundaries. try to
* switch to next step
*/
pEnt->step_no++;
if (ent_mvstep[pEnt->step_no].count != 0xff) {
/* there is a next step: init and loop */
pEnt->step_count = 0;
}
else {
/* there is no next step: restart or deactivate */
if (!E_RICK_STTST(E_RICK_STZOMBIE) &&
!(pEnt->flags & ENT_FLG_ONCE)) {
/* loop this entity */
pEnt->sproffs = 0;
pEnt->n &= ~ENT_LETHAL;
if (pEnt->flags & ENT_FLG_LETHALR)
pEnt->n |= ENT_LETHAL;
pEnt->x = pEnt->xsave;
pEnt->y = pEnt->ysave;
if (pEnt->y < 0 || pEnt->y > 0x140) {
pEnt->n = 0;
return;
}
}
else {
/* deactivate this entity */
pEnt->n = 0;
return;
}
}
}
else { /* pEnt->sprseq1 == 0 -- waiting */
/* ugly GOTOs */
if (pEnt->flags & ENT_FLG_TRIGRICK) { /* reacts to rick */
/* wake up if triggered by rick */
if (u_trigbox(pEnt, E_RICK_ENT.x + 0x0C, E_RICK_ENT.y + 0x0A))
goto wakeup;
}
if (pEnt->flags & ENT_FLG_TRIGSTOP) { /* reacts to rick "stop" */
/* wake up if triggered by rick "stop" */
if (E_RICK_STTST(E_RICK_STSTOP) &&
u_trigbox(pEnt, e_rick_stop_x, e_rick_stop_y))
goto wakeup;
}
if (pEnt->flags & ENT_FLG_TRIGBULLET) { /* reacts to bullets */
/* wake up if triggered by bullet */
if (E_BULLET_ENT.n && u_trigbox(pEnt, e_bullet_xc, e_bullet_yc)) {
E_BULLET_ENT.n = 0;
goto wakeup;
}
}
if (pEnt->flags & ENT_FLG_TRIGBOMB) { /* reacts to bombs */
/* wake up if triggered by bomb */
if (e_bomb_lethal && u_trigbox(pEnt, 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;
#ifdef ENABLE_SOUND
/*
* 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...
*/
syssnd_play(WAV_ENTITY[(pEnt->trigsnd & 0x1F) - 0x14], 1);
/*syssnd_play(WAV_ENTITY[0], 1);*/
#endif
pEnt->n &= ~ENT_LETHAL;
if (pEnt->flags & ENT_FLG_LETHALI)
pEnt->n |= ENT_LETHAL;
pEnt->sproffs = 1;
pEnt->step_count = 0;
pEnt->step_no = pEnt->step_no_i;
return;
}
}
#undef step_count
}
/*
* Action function for e_them _t3 type
*
* ASM 2546
*/
void
e_them_t3_action(ent_t* pEnt)
{
e_them_t3_action2(pEnt);
/* if lethal, can kill rick */
if ((pEnt->n & ENT_LETHAL) &&
!E_RICK_STTST(E_RICK_STZOMBIE) && e_rick_boxtest(pEnt)) { /* CALL 1130 */
e_rick_gozombie();
}
}
/* eof */
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