1 /*
2 Copyright (c) 2009-2010 Tero Lindeman (kometbomb)
3
4 Permission is hereby granted, free of charge, to any person
5 obtaining a copy of this software and associated documentation
6 files (the "Software"), to deal in the Software without
7 restriction, including without limitation the rights to use,
8 copy, modify, merge, publish, distribute, sublicense, and/or sell
9 copies of the Software, and to permit persons to whom the
10 Software is furnished to do so, subject to the following
11 conditions:
12
13 The above copyright notice and this permission notice shall be
14 included in all copies or substantial portions of the Software.
15
16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
18 OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
20 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
22 FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26
27 #include "background.h"
28 #include "gfx.h"
29 #include <stdlib.h>
30 #include <string.h>
31
bg_check_collision(const Background * bg,const ObjHdr * object,ObjHdr * collided_object)32 int bg_check_collision(const Background *bg, const ObjHdr *object, ObjHdr *collided_object)
33 {
34 int right = (object->x + object->w) / CELLSIZE, bottom = (object->y + object->h) / CELLSIZE;
35 int top = (object->y) / CELLSIZE-1, left = (object->x) / CELLSIZE-1;
36
37 ObjHdr _hdr;
38 ObjHdr *hdr = (collided_object != NULL) ? collided_object : &_hdr;
39
40 hdr->w = CELLSIZE;
41 hdr->h = CELLSIZE;
42 hdr->y = top * CELLSIZE;
43
44 for (int y = top ; y <= bottom ; ++y)
45 {
46 hdr->x = left * CELLSIZE;
47
48 int _y = y;
49
50 if (bg->flags & BG_REPEAT_Y) _y = ((y % bg->h)+bg->h) % bg->h;
51 else if (y >= bg->h) break;
52
53 //printf("%d %d\n", hdr.x, object->x);
54
55
56 if (_y >= 0)
57 {
58 for (int x = left ; x <= right ; ++x)
59 {
60 int _x = x;
61
62 if (bg->flags & BG_REPEAT_X) _x = ((x % bg->w)+bg->w) % bg->w;
63 else if (x >= bg->w) break;
64
65 if (_x >= 0)
66 {
67 if ( bg->data[_x+_y*bg->w].tile && !(bg->tiles[bg->data[_x+_y*bg->w].tile-1].flags & TILE_COL_DISABLE))
68 {
69 hdr->objflags = bg->tiles[bg->data[_x+_y*bg->w].tile-1].flags;
70 hdr->surface = bg->tiles[bg->data[_x+_y*bg->w].tile-1].surface;
71 hdr->current_frame = bg->tiles[bg->data[_x+_y*bg->w].tile-1].rect.x / CELLSIZE;
72 hdr->_yofs = bg->tiles[bg->data[_x+_y*bg->w].tile-1].rect.y;
73
74 if (objhdr_check_collision(object, hdr))
75 {
76 return 1;
77 }
78 }
79 }
80
81 hdr->x += CELLSIZE;
82 }
83 }
84
85 hdr->y += CELLSIZE;
86 }
87
88 return 0;
89 }
90
bg_draw(GfxDomain * surface,const SDL_Rect * dest,const Background * bg,int xofs,int yofs)91 void bg_draw(GfxDomain *surface, const SDL_Rect * dest, const Background *bg, int xofs, int yofs)
92 {
93 int sx = 0;
94 int sy = 0;
95
96 const SDL_Rect def = {0, 0, surface->screen_w, surface->screen_h};
97
98 if (dest == NULL)
99 dest = &def;
100
101 for (int y = (yofs) / CELLSIZE - 1; sy <= dest->h + 2 * CELLSIZE ; ++y, sy += CELLSIZE)
102 {
103 sx = 0;
104
105 int _y = y;
106
107 if (bg->flags & BG_REPEAT_Y) _y = ((y % bg->h)+bg->h) % bg->h;
108 else if (y < 0) continue;
109 else if (y >= bg->h) break;
110
111 for (int x = (xofs) / CELLSIZE - 1 ; sx <= dest->w + 2 * CELLSIZE ; ++x, sx += CELLSIZE)
112 {
113 int _x = x;
114
115 if (bg->flags & BG_REPEAT_X) _x = ((x % bg->w)+bg->w) % bg->w;
116 else if (x < 0) continue;
117 else if (x >= bg->w) break;
118
119 BgCell * cell = &bg->data[_y*bg->w + _x];
120
121 if ( cell->tile )
122 {
123 SDL_Rect rect = { sx - (xofs % (CELLSIZE)) + dest->x - CELLSIZE, sy - (yofs % (CELLSIZE)) + dest->y - CELLSIZE, CELLSIZE, CELLSIZE };
124 my_BlitSurface(bg->tiles[cell->tile-1].surface, &bg->tiles[cell->tile-1].rect, surface, &rect);
125 // SDL_FillRect(surface, &rect, 0x808080);
126 }
127
128 }
129 }
130
131 }
132
133
bg_check_collision_chained(const Background * bg,const ObjHdr * head,ObjHdr * collided_tile)134 const ObjHdr * bg_check_collision_chained(const Background *bg, const ObjHdr *head, ObjHdr *collided_tile)
135 {
136 const ObjHdr *ptr;
137 objhdr_walk(ptr, head, if (bg_check_collision(bg, ptr, collided_tile)) return ptr);
138 return NULL;
139 }
140
141
bg_create_tile_objhdr(ObjHdr * object_array,const Background * bg,int x,int y,int w,int h,int zero_src,TileDescriptor * tiles)142 int bg_create_tile_objhdr(ObjHdr* object_array, const Background *bg, int x, int y, int w, int h, int zero_src, TileDescriptor *tiles)
143 {
144 int items = 0;
145 ObjHdr *obj = object_array;
146
147 if (!tiles)
148 tiles = bg->tiles;
149
150 for (int _y = y ; _y < h + y ; ++_y)
151 {
152 for (int _x = x ; _x < w + x ; ++_x)
153 {
154 if (bg->data[_x + _y * bg->w].tile)
155 {
156 if (obj != NULL)
157 {
158 obj->objflags = tiles[bg->data[_x + _y * bg->w].tile-1].flags & OBJ_COL_FLAGS;
159 obj->x = (_x - x) * CELLSIZE;
160 obj->y = (_y - y) * CELLSIZE;
161 obj->w = obj->h = CELLSIZE;
162 obj->anim = NULL;
163 obj->current_frame = tiles[bg->data[_x + _y * bg->w].tile-1].rect.x / CELLSIZE;
164 obj->_yofs = tiles[bg->data[_x + _y * bg->w].tile-1].rect.y;
165 obj->surface = tiles[bg->data[_x + _y * bg->w].tile-1].surface;
166 obj = obj->next;
167 if (zero_src) bg->data[_x + _y * bg->w].tile = 0;
168 }
169 ++items;
170 }
171 }
172 }
173
174 if (items > 0) object_array[items-1].next = NULL;
175
176 return items;
177 }
178
179
bg_create(Background * bg,int w,int h)180 void bg_create(Background *bg, int w, int h)
181 {
182 memset(bg, 0, sizeof(*bg));
183 bg->data = calloc(w * h, sizeof(bg->data[0]));
184 bg->w = w;
185 bg->h = h;
186 }
187
188
bg_destroy(Background * bg)189 void bg_destroy(Background *bg)
190 {
191 free(bg->data);
192 memset(bg, 0, sizeof(*bg));
193 }
194