435 lines
10 KiB
C
435 lines
10 KiB
C
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/* monsters logic */
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#include "game.h"
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#include "resource.h"
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#include "util.h"
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static void monster_func1_helper(struct object_t *obj, int16_t x_pos, int16_t y_pos) {
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struct level_monster_t *m = obj->data.m.ref;
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if (obj->data.m.state == 0xFF) {
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return;
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}
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if (obj->spr_num & 0x2000) {
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return;
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}
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const int dx = abs(x_pos - g_vars.objects_tbl[1].x_pos);
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if (dx <= 320) {
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const int dy = abs(y_pos - g_vars.objects_tbl[1].y_pos);
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if (dy <= 300) {
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return;
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}
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}
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if (obj->data.m.state < 10) {
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obj->spr_num = 0xFFFF;
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m->flags &= ~4;
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m->current_tick = 0;
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} else {
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m->current_tick = 0;
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obj->spr_num = 0xFFFF;
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m->flags &= ~4;
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if ((m->flags & 2) == 0) {
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m->spr_num = 0xFFFF;
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}
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}
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}
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static bool monster_next_tick(struct level_monster_t *m) {
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if (m->current_tick < 255) {
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++m->current_tick;
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}
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return ((m->current_tick >> 2) < m->total_ticks);
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}
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static void monster_change_next_anim(struct object_t *obj) {
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const uint8_t *p = obj->data.m.anim;
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while ((int16_t)READ_LE_UINT16(p) >= 0) {
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p += 2;
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}
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obj->data.m.anim = p + 2;
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}
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static void monster_change_prev_anim(struct object_t *obj) {
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const uint8_t *p = obj->data.m.anim;
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do {
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p -= 2;
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} while ((int16_t)READ_LE_UINT16(p) >= 0);
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obj->data.m.anim = p;
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}
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static struct rotation_t *find_rotation() {
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for (int i = 0; i < 20; ++i) {
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struct rotation_t *r = &g_vars.rotation_tbl[i];
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if (r->x_pos == 0xFFFF) {
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return r;
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}
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}
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return 0;
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}
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static void monster_rotate_platform(struct level_monster_t *m, int index, int step) {
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step >>= 2;
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uint8_t radius = step;
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for (int i = 0; i < 3; ++i) {
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struct rotation_t *r = find_rotation();
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if (r) {
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r->x_pos = m->x_pos;
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r->y_pos = m->y_pos - 24;
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r->radius = radius;
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r->index_tbl = index;
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radius += step;
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}
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}
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}
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static void monster_rotate_pos(struct object_t *obj, struct level_monster_t *m) {
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obj->x_pos = m->x_pos + ((m->type4.unkD * (cos_tbl[m->type4.angle] >> 2)) >> 4);
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obj->y_pos = m->y_pos + ((m->type4.unkD * (sin_tbl[m->type4.angle] >> 2)) >> 4);
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monster_rotate_platform(m, m->type4.angle, m->type4.unkD);
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}
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static void monster_update_y_velocity(struct object_t *obj, struct level_monster_t *m) {
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if ((m->flags & 1) != 0 && ((obj->spr_num & 0x2000) != 0 || g_vars.objects_tbl[1].y_pos >= obj->y_pos)) {
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if (obj->data.m.y_velocity < 240) {
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obj->data.m.y_velocity += 15;
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}
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} else {
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m->current_tick = 0;
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obj->spr_num = 0xFFFF;
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m->flags &= ~4;
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if ((m->flags & 2) == 0) {
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m->spr_num = 0xFFFF;
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}
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}
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}
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static void monster_func1_type2(struct object_t *obj) {
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monster_func1_helper(obj, obj->x_pos, obj->y_pos);
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struct level_monster_t *m = obj->data.m.ref;
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const uint8_t state = obj->data.m.state;
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if (state < 2) {
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monster_rotate_platform(m, 0, obj->y_pos - m->y_pos);
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if (state == 0) {
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obj->data.m.y_velocity = m->type2.unkE << 4;
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const int dy = obj->y_pos - m->y_pos;
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if (m->type2.y_range >= dy) {
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return;
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}
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obj->data.m.state = 1;
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monster_change_next_anim(obj);
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} else if (state == 1) {
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obj->data.m.y_velocity = m->type2.unkE << 4;
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const int dy = obj->y_pos - m->y_pos;
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if (dy >= 0) {
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return;
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}
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obj->data.m.state = 0;
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monster_change_prev_anim(obj);
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}
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} else if (state == 0xFF) {
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monster_update_y_velocity(obj, m);
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}
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}
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static void monster_func1_type4(struct object_t *obj) {
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monster_func1_helper(obj, obj->x_pos, obj->y_pos);
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struct level_monster_t *m = obj->data.m.ref;
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const uint8_t state = obj->data.m.state;
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if (state == 0) {
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if (monster_next_tick(m)) {
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return;
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}
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const int dy = obj->y_pos - m->y_pos;
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monster_rotate_platform(m, 0, dy);
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if (m->type4.unkD > dy) {
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obj->y_pos += 2;
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} else {
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obj->data.m.state = 1;
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}
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} else if (state == 1) {
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monster_rotate_pos(obj, m);
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m->type4.angle += 4;
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if (m->type4.angle >= m->type4.unkE) {
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m->type4.angle = m->type4.unkE;
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obj->data.m.state = 2;
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}
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} else if (state == 2) {
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if (m->type4.angle & 0x80) {
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++m->type4.unk10;
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} else {
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--m->type4.unk10;
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}
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m->type4.angle = m->type4.unk10;
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} else if (state == 0xFF) {
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monster_update_y_velocity(obj, m);
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}
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}
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static void monster_func1_type8(struct object_t *obj) {
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monster_func1_helper(obj, obj->x_pos, obj->y_pos);
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struct level_monster_t *m = obj->data.m.ref;
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if (obj->data.m.x_velocity != 0) {
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const int dx = (obj->x_pos <= g_vars.objects_tbl[1].x_pos) ? 1 : -1;
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obj->data.m.x_velocity = dx;
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}
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const uint8_t state = obj->data.m.state;
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if ((state == 0 && !monster_next_tick(m)) || (state == 12 && !monster_next_tick(m))) {
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const int dx = abs(g_vars.objects_tbl[1].x_pos - obj->x_pos);
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if (m->type8.x_range < (dx >> 4)) {
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return;
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}
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const int dy = abs(g_vars.objects_tbl[1].y_pos - obj->y_pos);
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if (m->type8.y_range < (dy >> 4)) {
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return;
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}
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obj->data.m.y_velocity = -(m->type8.unkE << 4);
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int x_vel = m->type8.unkF << 4;
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if (g_vars.objects_tbl[1].x_pos <= obj->x_pos) {
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x_vel = -x_vel;
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}
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obj->data.m.x_velocity = x_vel;
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obj->data.m.state = 10;
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m->flags = (m->flags & ~0x2C) | 0x2C;
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monster_change_next_anim(obj);
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} else if (state == 10) {
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if (obj->data.m.y_velocity < 0) {
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return;
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}
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obj->data.m.state = 11;
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monster_change_next_anim(obj);
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} else if (state == 11) {
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if (obj->data.m.y_velocity > 0) {
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return;
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}
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obj->data.m.state = 12;
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monster_change_prev_anim(obj);
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monster_change_prev_anim(obj);
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obj->data.m.x_velocity = 0;
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m->current_tick = 0;
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} else if (state == 0xFF) {
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monster_update_y_velocity(obj, m);
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}
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}
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static void monster_func1_type9(struct object_t *obj) {
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struct level_monster_t *m = obj->data.m.ref;
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if ((obj->spr_num & 0x2000) == 0 && obj->data.m.state != 0xFF) {
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const int dy = abs(obj->y_pos - g_vars.objects_tbl[1].y_pos);
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if (dy >= 190 || (g_vars.objects_tbl[1].x_pos < m->type9.unkD && g_vars.objects_tbl[1].x_pos + 480 < m->type9.unkD) || (g_vars.objects_tbl[1].x_pos >= m->type9.unkD && m->type9.unkF + 480 <= g_vars.objects_tbl[1].x_pos)) {
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obj->spr_num = 0xFFFF;
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m->flags &= ~4;
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return;
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}
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}
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const uint8_t state = obj->data.m.state;
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if (state == 0) {
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obj->data.m.x_velocity = m->type9.unk11;
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const int x = m->type9.unk11 + 3;
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if (x <= m->type9.unk12) {
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m->type9.unk11 = x;
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}
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if (m->type9.unkF < obj->x_pos) {
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obj->data.m.state = 1;
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}
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} else if (state == 1) {
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obj->data.m.x_velocity = m->type9.unk11;
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const int x = m->type9.unk11 - 3;
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if (x >= -m->type9.unk12) {
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m->type9.unk11 = x;
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}
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if (m->type9.unkD >= obj->x_pos) {
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obj->data.m.state = 1;
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}
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} else if (state == 0xFF) {
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monster_update_y_velocity(obj, m);
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}
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}
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void monster_func1(int type, struct object_t *obj) {
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switch (type) {
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case 1:
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monster_func1_helper(obj, obj->x_pos, obj->y_pos);
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break;
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case 2:
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monster_func1_type2(obj);
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break;
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case 4:
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monster_func1_type4(obj);
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break;
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case 8:
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monster_func1_type8(obj);
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break;
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case 9:
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monster_func1_type9(obj);
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break;
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default:
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print_warning("monster_func1 unhandled monster type %d", type);
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break;
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}
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}
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static struct object_t *find_object_monster() {
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for (int i = 0; i < MONSTERS_COUNT; ++i) {
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struct object_t *obj = &g_vars.objects_tbl[11 + i];
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if (obj->spr_num == 0xFFFF) {
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return obj;
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}
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}
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return 0;
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}
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static bool monster_init_object(struct level_monster_t *m) {
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struct object_t *obj = find_object_monster();
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if (obj) {
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obj->data.m.unk10 = 0;
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g_vars.monster.current_object = obj;
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obj->x_pos = m->x_pos;
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obj->y_pos = m->y_pos;
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obj->spr_num = m->spr_num;
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obj->data.m.ref = m;
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m->flags = 0x17;
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obj->data.m.x_velocity = 0;
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obj->data.m.y_velocity = 0;
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obj->data.m.state = 0;
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obj->data.m.energy = m->energy;
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return true;
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}
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return false;
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}
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static bool monster_is_visible(int x_pos, int y_pos) {
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const int dx = (x_pos >> 4) - g_vars.tilemap_x;
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if (dx < -2 || dx > (TILEMAP_SCREEN_W + 2)) {
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return false;
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}
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const int dy = (y_pos >> 4) - g_vars.tilemap_y;
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if (dy < -2 || dy > (TILEMAP_SCREEN_H + 2)) {
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return false;
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}
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return true;
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}
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static bool monster_func2_type1(struct level_monster_t *m) {
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const int16_t x_pos = m->x_pos;
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const int16_t y_pos = m->y_pos;
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if (!monster_is_visible(x_pos, y_pos)) {
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return false;
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}
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return monster_init_object(m);
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}
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static bool monster_func2_type2(struct level_monster_t *m) {
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if (!monster_is_visible(m->x_pos, m->y_pos)) {
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return false;
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}
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struct object_t *obj = find_object_monster();
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if (obj) {
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obj->data.m.unk10 = 0;
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g_vars.monster.current_object = obj;
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obj->x_pos = m->x_pos;
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obj->y_pos = m->y_pos;
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obj->spr_num = m->spr_num;
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obj->data.m.ref = m;
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m->flags = 5;
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obj->data.m.y_velocity = 0;
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obj->data.m.x_velocity = 0;
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obj->data.m.state = 0;
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obj->data.m.energy = m->energy;
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return true;
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}
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return false;
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}
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static bool monster_func2_type4(struct level_monster_t *m) {
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if (!monster_func2_type1(m)) {
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return false;
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}
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m->flags = 5;
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return true;
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}
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static bool monster_func2_type5_6_7_8(struct level_monster_t *m) {
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if (!monster_func2_type1(m)) {
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return false;
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}
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m->flags = 5;
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return true;
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}
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static bool monster_func2_type9(struct level_monster_t *m) {
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uint8_t flags = m->flags;
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if (!monster_func2_type1(m)) {
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return false;
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}
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flags |= 5;
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if (g_vars.level_num == 6) {
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flags |= 0x80;
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}
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m->flags = flags;
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return true;
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}
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static bool monster_func2_type10(struct level_monster_t *m) {
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if (g_vars.level_num == 5 && g_vars.shake_screen_counter != 0) {
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return false;
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}
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if (m->current_tick < 255) {
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++m->current_tick;
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}
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if (m->total_ticks > (m->current_tick >> 2)) {
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return false;
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}
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const int dx = (g_vars.objects_tbl[1].x_pos >> 4) - m->x_pos;
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if (dx < 0) {
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return false;
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}
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const int dy = (g_vars.objects_tbl[1].y_pos >> 4) - m->y_pos;
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if (dy < 0) {
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return false;
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}
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struct object_t *obj = find_object_monster();
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if (!obj) {
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return false;
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}
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print_warning("monster_func2_type10 6579");
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return true;
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}
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static bool monster_func2_type11(struct level_monster_t *m) {
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if (m->current_tick < 255) {
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++m->current_tick;
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}
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if (m->total_ticks > (m->current_tick >> 2) || !monster_func2_type1(m)) {
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return false;
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}
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m->flags = 0x37;
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g_vars.monster.current_object->y_pos -= (random_get_number() & 0x3F);
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return true;
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}
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bool monster_func2(int type, struct level_monster_t *m) {
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switch (type) {
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case 1:
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return monster_func2_type1(m);
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case 2:
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return monster_func2_type2(m);
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case 4:
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return monster_func2_type4(m);
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case 5:
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case 6:
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case 7:
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case 8:
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return monster_func2_type5_6_7_8(m);
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case 9:
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return monster_func2_type9(m);
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case 10:
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return monster_func2_type10(m);
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case 11:
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return monster_func2_type11(m);
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default:
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print_warning("monster_func2 unhandled monster type %d", type);
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break;
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}
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return false;
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}
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