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#include <stdint.h>
#include "keyb.h"
#include "vga.h"
#include "map.h"
#include "data.h"
#include "game.h"
#include "player.h"
#define DIR_RIGHT 0
#define DIR_LEFT 1
#define FRAME_STANDING 0
#define FRAME_JUMPING 4
#define FRAME_DYING 5
#define WALK_CYCLE_FRAMES 4
#define WALK_DELAY 8
#define GRAVITY_OFF 0
/* XXX: subtract 1 to get the value from gravity_seq */
#define GRAVITY_DOWN 14
#define GRAVITY_UP 1
#define GRAVITY_SEQ_LEN 24
/* used for "coyote time" */
#define MAX_MOMENTUM 8
#define IS_NOT_GOING_UP(x) (gravity == GRAVITY_OFF || (x)>=GRAVITY_DOWN)
static uint16_t x, y;
static uint8_t dir, frame, delay, gravity, jump, momentum;
const uint8_t gravity_seq[GRAVITY_SEQ_LEN] = {
6, 4, 4, 2, 2, 2, 2, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 2, 2, 2, 4
};
static uint8_t bg[256];
static const Rect frames[2][6] =
{
{
/* walk cycle */
{ 0, 0, 144, 144 },
{ 16, 0, 144, 144 },
{ 0, 0, 144, 144 },
{ 32, 0, 144, 144 },
/* jump */
{ 48, 0, 144, 144 },
/* dying */
{ 128, 0, 144, 144 },
},
{
/* walk cycle */
{ 64, 0, 144, 144 },
{ 80, 0, 144, 144 },
{ 64, 0, 144, 144 },
{ 96, 0, 144, 144 },
/* jump */
{ 112, 0, 144, 144 },
/* dying */
{ 128, 0, 144, 144 },
},
};
void player_init(uint16_t start_x, uint8_t start_y, uint8_t start_dir)
{
dir = start_dir;
frame = FRAME_STANDING;
delay = 0;
jump = 0;
momentum = 0;
x = start_x;
y = start_y;
gravity = GRAVITY_OFF;
}
void player_update()
{
uint8_t moved = 0;
if (momentum)
momentum--;
if (gravity == GRAVITY_OFF
&& !map_is_blocked(x + 4, y + 16)
&& !map_is_blocked(x + 11, y + 16))
{
gravity = GRAVITY_DOWN;
frame = FRAME_JUMPING;
moved = 1;
}
if (keys[KEY_UP])
{
if ((gravity == GRAVITY_OFF || momentum) && !jump)
{
jump = 1;
momentum = 0;
frame = FRAME_JUMPING;
gravity = GRAVITY_UP;
}
}
else
jump = 0;
if (keys[KEY_RIGHT] && !keys[KEY_LEFT])
{
moved = 1;
dir = DIR_RIGHT;
/* XXX: off limits */
if (x < MAP_W * MAP_TILE_W - 16)
{
if ((IS_NOT_GOING_UP(gravity) && !map_is_blocked(x + 16, y + 15))
|| (!IS_NOT_GOING_UP(gravity)
&& !(map_is_blocked(x + 16, y + 15)
&& map_is_blocked(x + 16, y + 7))))
{
if (gravity == GRAVITY_OFF && momentum < MAX_MOMENTUM)
momentum += 4;
x++;
}
}
}
if (keys[KEY_LEFT] && !keys[KEY_RIGHT])
{
moved = 1;
dir = DIR_LEFT;
/* XXX: off limits */
if (x)
{
if ((IS_NOT_GOING_UP(gravity) && !map_is_blocked(x - 1, y + 15))
|| (!IS_NOT_GOING_UP(gravity)
&& !(map_is_blocked(x - 1, y + 15)
&& map_is_blocked(x - 1, y + 7))))
{
if (gravity == GRAVITY_OFF && momentum < MAX_MOMENTUM)
momentum += 4;
x--;
}
}
}
if (gravity != GRAVITY_OFF)
{
uint8_t steps = gravity_seq[gravity - 1];
moved = 1;
if (gravity > GRAVITY_DOWN)
{
/* going down! */
for (uint8_t i = 0; i < steps; i++)
{
/* hit the floor */
if ((map_is_blocked(x + 11, y + 16)
|| map_is_blocked(x + 4, y + 16))
&& !map_is_blocked(x + 4, y + 15)
&& !map_is_blocked(x + 11, y + 15))
{
gravity = GRAVITY_OFF;
frame = FRAME_STANDING;
break;
}
y++;
}
}
else
{
/* going up! */
if (y < steps)
y = 0;
else
y -= steps;
}
if (gravity != GRAVITY_OFF && gravity != GRAVITY_SEQ_LEN)
gravity++;
}
if (moved)
{
if (delay++ == WALK_DELAY)
{
delay = 0;
if (frame != FRAME_JUMPING)
{
frame++;
if (frame == WALK_CYCLE_FRAMES)
frame = FRAME_STANDING;
}
}
}
else
{
delay = 0;
frame = FRAME_STANDING;
}
if (map_update_gold(x + (dir == DIR_LEFT ? 7 : 8), y + 15))
add_score(10);
}
void player_erase()
{
Rect dst = { x, y + MAP_OFFS_Y, 16, 16 };
blit(bg, &dst);
}
void player_draw()
{
Rect dst = { x, y + MAP_OFFS_Y, 16, 16 };
read_buffer(bg, &dst);
blitrc(binary_sprites_start, &frames[dir][frame], &dst);
}
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