Enter the player!

1 files changed, 206 insertions, 0 deletions

diff --git a/src/player.c b/src/player.c
new file mode 100644
index 0000000..b0960bc
--- /dev/null
+++ b/src/player.c
@@ -0,0 +1,206 @@
+#include <stdint.h>
+
+#include "keyb.h"
+#include "vga.h"
+#include "map.h"
+#include "data.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
+
+#define IS_GOING_DOWN(x) ((x)>=GRAVITY_DOWN)
+
+static uint16_t x, y;
+static uint8_t dir, frame, delay, gravity, jump;
+
+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)
+{
+    dir = DIR_RIGHT;
+    frame = FRAME_STANDING;
+    delay = 0;
+    jump = 0;
+
+    x = start_x;
+    y = start_y;
+    gravity = GRAVITY_OFF;
+}
+
+void player_update()
+{
+    uint8_t moved = 0;
+
+    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 && !jump)
+        {
+            jump = 1;
+            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_GOING_DOWN(gravity) && !map_is_blocked(x + 16, y + 15))
+                    || (!IS_GOING_DOWN(gravity)
+                        && !(map_is_blocked(x + 16, y + 15)
+                             && map_is_blocked(x + 16, y + 7))))
+                x++;
+        }
+    }
+
+    if (keys[KEY_LEFT] && !keys[KEY_RIGHT])
+    {
+        moved = 1;
+        dir = DIR_LEFT;
+
+        /* XXX: off limits */
+        if (x)
+        {
+            if ((IS_GOING_DOWN(gravity) && !map_is_blocked(x - 1, y + 15))
+                    || (!IS_GOING_DOWN(gravity)
+                        && !(map_is_blocked(x - 1, y + 15)
+                             && map_is_blocked(x - 1, y + 7))))
+                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;
+    }
+}
+
+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);
+}