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// ********* Create ***************//
1		// ******* Create *************//
2		bbox = new tile_bbox(mask_index); // Instance of the struct below
3
4		// ******* How to call it when moving (step event or something) ************* //
5		bbox.move_collide(id, x, y, _vx, _vy); // _vx and _vy are whatever your movement speeds are
6
7
8		// ******* The struct ****************************//
9		function tile_bbox(_mask) constructor
10		{
11		/* Performs tile collision independent from object's bbox.
12		* Since we can use a separate mask here from the objects, that allows
13		* the object to use a different shaped mask for hit detection and not
14		* need a whole other "hurtbox" object.
15		*
16		* Plus this is actually faster and requires less round/floor/ceil nonsense
17		* to fix some internal junk.
18		*
19		* Note the "& 1" checks for odd numbered tiles as "solid", pretty usefull
20		* if you want waist high walls that cause movement collision but can be
21		* shot over with a gun or something.
22		*/
23
24		#macro TILE_SOLID 1
25		#macro TILE_ONE_WAY 2
26		#macro TILE_SIZE 16
27		#macro TILE_SIZE_M1 15
28
29		#macro COLLIDE_VER_UP 1
30		#macro COLLIDE_VER_DOWN -1
31		#macro COLLIDE_VER_NONE 0
32		#macro COLLIDE_HOR_RIGHT 1
33		#macro COLLIDE_HOR_LEFT -1
34		#macro COLLIDE_HOR_NONE 0
35
36		var _w = sprite_get_width(_mask),
37		_h = sprite_get_height(_mask),
38		_y_count = ceil(_h / TILE_SIZE),
39		_x_count = ceil(_w / TILE_SIZE);
40
41		mask_sprite = _mask;
42
43		cmap = global.layer_collision;
44		// or layer_tilemap_get_id(layer_get_id("collision_map"));
45		// Remember the id could change between rooms
46
47		left = -sprite_get_xoffset(_mask);
48		right = _w - sprite_get_xoffset(_mask);
49		top = -sprite_get_yoffset(_mask);
50		bottom = _h - sprite_get_yoffset(_mask);
51
52		hor_count = _y_count + 1;
53		hor_increment = (_h - 1) / _y_count;
54		ver_count = _x_count + 1;
55		ver_increment = (_w - 1) / _x_count;
56
57		on_horizontal = 0; // Useful for wall jumps
58		on_vertical = 0; // Can be used to set on_ground
59		on_one_way_platform = false;
60
61		function move_collide(_this, _x, _y, _vx, _vy)
62		{
63		_x += _vx;
64		if (_vx > 0) _x = collide_right(_x, _y);
65		else if (_vx < 0) _x = collide_left(_x, _y);
66		else on_horizontal = COLLIDE_HOR_NONE;
67
68		_y += _vy;
69		if (_vy > 0) _y = collide_bottom(_x, _y, _vy);
70		else if (_vy < 0) _y = collide_top(_x, _y);
71		else
72		{
73		on_vertical = COLLIDE_VER_NONE;
74		on_one_way_platform = false;
75		}
76
77		_this.x = _x;
78		_this.y = _y;
79		}
80
81		function collide_right(_x, _y)
82		{
83		var _right = _x + right;
84		_y = round(_y + top);
85		for (var _i = 0; _i < hor_count; _i++)
86		{
87		if ((tilemap_get_at_pixel(cmap, _right, _y) & tile_index_mask) & 1)
88		{
89		on_horizontal = COLLIDE_HOR_RIGHT;
90		return (_right &~ TILE_SIZE_M1) - right;
91		}
92		_y += hor_increment;
93		}
94		on_horizontal = COLLIDE_HOR_NONE;
95		return _x;
96		}
97
98		function collide_left(_x, _y)
99		{
100		var _left = _x + left;
101		_y = round(_y + top);
102		for (var _i = 0; _i < hor_count; _i++)
103		{
104		if ((tilemap_get_at_pixel(cmap, _left, _y) & tile_index_mask) & 1)
105		{
106		on_horizontal = COLLIDE_HOR_LEFT;
107		return (_left &~ TILE_SIZE_M1) + TILE_SIZE - left;
108		}
109		_y += hor_increment;
110		}
111		on_horizontal = COLLIDE_HOR_NONE;
112		return _x;
113		}
114
115		function collide_top(_x, _y)
116		{
117		on_one_way_platform = false;
118		var _top = _y + top;
119		_x = round(_x + left);
120		for (var _i = 0; _i < ver_count; _i++)
121		{
122		if ((tilemap_get_at_pixel(cmap, _x, _top) & tile_index_mask) & 1)
123		{
124		on_vertical = COLLIDE_VER_UP;
125		return (_top &~ TILE_SIZE_M1) + TILE_SIZE - top;
126		}
127		_x += ver_increment;
128		}
129		on_vertical = COLLIDE_VER_NONE;
130		return _y;
131		}
132
133		function collide_bottom(_x, _y, _vy)
134		{
135		// A bit different to account for one-way platforms
136
137		var _bottom = _y + bottom,
138		_tile_top = _bottom &~ TILE_SIZE_M1,
139		_above_one_way = (_bottom - _vy) <= _tile_top;
140
141		_x = round(_x + left);
142		for (var _i = 0; _i < ver_count; _i++)
143		{
144		var _tile_index = tilemap_get_at_pixel(cmap, _x, _bottom) & tile_index_mask,
145		_on_one_way_platform = (_above_one_way && _tile_index == TILE_ONE_WAY);
146
147		if (_tile_index & 1 \|\| _on_one_way_platform)
148		{
149		on_vertical = COLLIDE_VER_DOWN;
150		on_one_way_platform = _on_one_way_platform;
151		return _tile_top - bottom;
152		}
153		_x += ver_increment;
154		}
155		on_vertical = COLLIDE_VER_NONE;
156		return _y;
157		}
158
159		function draw_mask(_x, _y)
160		{
161		draw_sprite(mask_sprite, 0, _x, _y);
162		}
163
164		}