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#include <stdint.h>
#include <stdlib.h>
#include "vga.h"
#include "map.h"
#include "entities.h"
#include "player.h"
#include "old.h"
#define FRAME_STANDING 0
#define FRAME_JUMPING 1
#define WALK_CYCLE_FRAMES 4
static const Rect frames[2 * 4] =
{
/* right */
{ 0, 80, 144, 112 },
{ 16, 80, 144, 112 },
{ 0, 80, 144, 112 },
{ 32, 80, 144, 112 },
/* left */
{ 48, 80, 144, 112 },
{ 64, 80, 144, 112 },
{ 48, 80, 144, 112 },
{ 80, 80, 144, 112 },
};
void old_init(Entity *e)
{
e->frames = (const Rect *)frames;
e->update = old_update;
}
static uint8_t is_bottom_deadly(uint16_t x, uint16_t y)
{
while (1)
{
if (map_is_deadly(x, y))
return 1;
if (map_is_blocked(x, y))
return 0;
y += 8;
}
}
void old_update(Entity *e)
{
if (e->gravity == GRAVITY_OFF
&& !map_is_blocked(e->x + 4, e->y + 16)
&& !map_is_blocked(e->x + 11, e->y + 16))
{
e->gravity = GRAVITY_DOWN;
e->frame = FRAME_JUMPING;
}
if (e->gravity != GRAVITY_OFF)
{
uint8_t steps = gravity_seq[e->gravity - 1];
if (e->gravity > GRAVITY_DOWN)
{
/* going down! */
for (uint8_t i = 0; i < steps; i++)
{
/* hit the floor */
if ((map_is_blocked(e->x + 11, e->y + 16)
|| map_is_blocked(e->x + 4, e->y + 16))
&& !map_is_blocked(e->x + 4, e->y + 15)
&& !map_is_blocked(e->x + 11, e->y + 15))
{
e->gravity = GRAVITY_OFF;
e->frame = FRAME_STANDING;
e->flags = rand() % (ENEMY_JUMP_DELAY * 2);
break;
}
e->y++;
}
}
else
{
/* going up! */
if (e->y < steps)
e->y = 0;
else
e->y -= steps;
}
if (e->gravity != GRAVITY_OFF && e->gravity != GRAVITY_SEQ_LEN)
e->gravity++;
}
else
{
if (e->delay & 1)
{
if (e->dir == DIR_RIGHT)
{
if (map_is_blocked(e->x + 16, e->y + 15)
|| is_bottom_deadly(e->x + 16, e->y + 16))
{
e->dir = DIR_LEFT;
e->flags++;
}
else
e->x++;
if (e->flags > ENEMY_JUMP_DELAY
&& map_is_blocked(e->x + 7, e->y - 1)
&& !map_is_blocked(e->x, e->y - 9)
&& !map_is_blocked(e->x + 7, e->y - 9))
{
e->gravity = GRAVITY_UP;
e->frame = FRAME_JUMPING;
}
}
else
{
/* dir is LEFT */
if (map_is_blocked(e->x - 1, e->y + 15)
|| is_bottom_deadly(e->x - 1, e->y + 16))
{
e->dir = DIR_RIGHT;
e->flags++;
}
else
e->x--;
if (e->flags > ENEMY_JUMP_DELAY
&& map_is_blocked(e->x + 7, e->y - 1)
&& !map_is_blocked(e->x + 15, e->y - 9)
&& !map_is_blocked(e->x + 7, e->y - 9))
{
e->gravity = GRAVITY_UP;
e->frame = FRAME_JUMPING;
}
}
}
if (e->delay++ == WALK_DELAY)
{
e->delay = 0;
e->frame++;
if (e->frame == WALK_CYCLE_FRAMES)
e->frame = FRAME_STANDING;
}
}
if (player_collision(e))
{
player_hit();
/* change direction */
e->dir ^= 1;
}
}
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