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| Rev | Author | Line No. | Line |
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| 1 | pmbaty | 1 | /* |
| 2 | * src/util.c |
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| 3 | * |
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| 4 | * Copyright (C) 1998-2002 BigOrno (bigorno@bigorno.net). All rights reserved. |
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| 5 | * |
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| 6 | * The use and distribution terms for this software are contained in the file |
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| 7 | * named README, which can be found in the root of this distribution. By |
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| 8 | * using this software in any fashion, you are agreeing to be bound by the |
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| 9 | * terms of this license. |
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| 10 | * |
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| 11 | * You must not remove this notice, or any other, from this software. |
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| 12 | */ |
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| 13 | |||
| 14 | #include <stdlib.h> /* NULL */ |
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| 15 | |||
| 16 | #include "system.h" |
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| 17 | #include "game.h" |
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| 18 | #include "util.h" |
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| 19 | |||
| 20 | #include "ents.h" |
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| 21 | #include "e_rick.h" |
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| 22 | #include "maps.h" |
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| 23 | |||
| 24 | |||
| 25 | /* |
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| 26 | * Full box test. |
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| 27 | * |
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| 28 | * ASM 1199 |
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| 29 | * |
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| 30 | * e: entity to test against. |
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| 31 | * x,y: coordinates to test. |
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| 32 | * ret: TRUE/(x,y) is within e's space, FALSE/not. |
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| 33 | */ |
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| 34 | U8 u_fboxtest (U8 e, S16 x, S16 y) |
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| 35 | { |
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| 36 | if (ent_ents[e].x >= x || ent_ents[e].x + ent_ents[e].w < x |
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| 37 | || ent_ents[e].y >= y || ent_ents[e].y + ent_ents[e].h < y) |
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| 38 | return FALSE; |
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| 39 | else |
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| 40 | return TRUE; |
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| 41 | } |
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| 42 | |||
| 43 | |||
| 44 | /* |
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| 45 | * Box test (then whole e2 is checked agains the center of e1). |
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| 46 | * |
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| 47 | * ASM 113E |
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| 48 | * |
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| 49 | * e1: entity to test against (corresponds to DI in asm code). |
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| 50 | * e2: entity to test (corresponds to SI in asm code). |
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| 51 | * ret: TRUE/intersect, FALSE/not. |
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| 52 | */ |
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| 53 | U8 u_boxtest (U8 e1, U8 e2) |
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| 54 | { |
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| 55 | /* rick is special (may be crawling) */ |
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| 56 | if (e1 == E_RICK_NO) |
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| 57 | return e_rick_boxtest (e2); |
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| 58 | |||
| 59 | /* |
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| 60 | * entity 1: x+0x05 to x+0x011, y to y+0x14 |
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| 61 | * entity 2: x to x+ .w, y to y+ .h |
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| 62 | */ |
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| 63 | if (ent_ents[e1].x + 0x11 < ent_ents[e2].x |
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| 64 | || ent_ents[e1].x + 0x05 > ent_ents[e2].x + ent_ents[e2].w |
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| 65 | || ent_ents[e1].y + 0x14 < ent_ents[e2].y |
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| 66 | || ent_ents[e1].y > ent_ents[e2].y + ent_ents[e2].h - 1) |
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| 67 | return FALSE; |
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| 68 | else |
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| 69 | return TRUE; |
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| 70 | } |
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| 71 | |||
| 72 | |||
| 73 | /* |
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| 74 | * Compute the environment flag. |
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| 75 | * |
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| 76 | * ASM 0FBC if !crawl, else 103E |
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| 77 | * |
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| 78 | * x, y: coordinates where to compute the environment flag |
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| 79 | * crawl: is rick crawling? |
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| 80 | * rc0: anything CHANGED to the environment flag for crawling (6DBA) |
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| 81 | * rc1: anything CHANGED to the environment flag (6DAD) |
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| 82 | */ |
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| 83 | void u_envtest (S16 x, S16 y, U8 crawl, U8 *rc0, U8 *rc1) |
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| 84 | { |
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| 85 | U8 i, xx; |
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| 86 | |||
| 87 | /* prepare for ent #0 test */ |
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| 88 | ent_ents[ENT_ENTSNUM].x = x; |
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| 89 | ent_ents[ENT_ENTSNUM].y = y; |
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| 90 | |||
| 91 | i = 1; |
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| 92 | if (!crawl) |
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| 93 | i++; |
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| 94 | if (y & 0x0004) |
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| 95 | i++; |
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| 96 | |||
| 97 | x += 4; |
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| 98 | xx = (U8) x; /* FIXME? */ |
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| 99 | |||
| 100 | x = x >> 3; /* from pixels to tiles */ |
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| 101 | y = y >> 3; /* from pixels to tiles */ |
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| 102 | |||
| 103 | *rc0 = *rc1 = 0; |
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| 104 | |||
| 105 | if (xx & 0x07) |
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| 106 | { /* tiles columns alignment */ |
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| 107 | if (crawl) |
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| 108 | { |
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| 109 | *rc0 |= (map_eflg[map_map[y][x]] & (MAP_EFLG_VERT|MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_WAYUP)); |
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| 110 | *rc0 |= (map_eflg[map_map[y][x + 1]] & (MAP_EFLG_VERT|MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_WAYUP)); |
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| 111 | *rc0 |= (map_eflg[map_map[y][x + 2]] & (MAP_EFLG_VERT|MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_WAYUP)); |
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| 112 | y++; |
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| 113 | } |
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| 114 | do |
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| 115 | { |
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| 116 | *rc1 |= (map_eflg[map_map[y][x]] & (MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_FGND|MAP_EFLG_LETHAL|MAP_EFLG_01)); |
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| 117 | *rc1 |= (map_eflg[map_map[y][x + 1]] & (MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_FGND|MAP_EFLG_LETHAL|MAP_EFLG_CLIMB|MAP_EFLG_01)); |
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| 118 | *rc1 |= (map_eflg[map_map[y][x + 2]] & (MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_FGND|MAP_EFLG_LETHAL|MAP_EFLG_01)); |
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| 119 | y++; |
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| 120 | } while (--i > 0); |
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| 121 | |||
| 122 | *rc1 |= (map_eflg[map_map[y][x]] & (MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_WAYUP|MAP_EFLG_FGND|MAP_EFLG_LETHAL|MAP_EFLG_01)); |
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| 123 | *rc1 |= (map_eflg[map_map[y][x + 1]]); |
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| 124 | *rc1 |= (map_eflg[map_map[y][x + 2]] & (MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_WAYUP|MAP_EFLG_FGND|MAP_EFLG_LETHAL|MAP_EFLG_01)); |
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| 125 | } |
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| 126 | else |
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| 127 | { |
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| 128 | if (crawl) |
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| 129 | { |
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| 130 | *rc0 |= (map_eflg[map_map[y][x]] & (MAP_EFLG_VERT|MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_WAYUP)); |
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| 131 | *rc0 |= (map_eflg[map_map[y][x + 1]] & (MAP_EFLG_VERT|MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_WAYUP)); |
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| 132 | y++; |
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| 133 | } |
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| 134 | do |
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| 135 | { |
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| 136 | *rc1 |= (map_eflg[map_map[y][x]] & (MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_FGND|MAP_EFLG_LETHAL|MAP_EFLG_CLIMB|MAP_EFLG_01)); |
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| 137 | *rc1 |= (map_eflg[map_map[y][x + 1]] & (MAP_EFLG_SOLID|MAP_EFLG_SPAD|MAP_EFLG_FGND|MAP_EFLG_LETHAL|MAP_EFLG_CLIMB|MAP_EFLG_01)); |
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| 138 | y++; |
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| 139 | } while (--i > 0); |
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| 140 | |||
| 141 | *rc1 |= (map_eflg[map_map[y][x]]); |
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| 142 | *rc1 |= (map_eflg[map_map[y][x + 1]]); |
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| 143 | } |
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| 144 | |||
| 145 | /* |
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| 146 | * If not lethal yet, and there's an entity on slot zero, and (x,y) |
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| 147 | * boxtests this entity, then raise SOLID flag. This is how we make |
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| 148 | * sure that no entity can move over the entity that is on slot zero. |
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| 149 | */ |
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| 150 | if (!(*rc1 & MAP_EFLG_LETHAL) && ent_ents[0].n && u_boxtest (ENT_ENTSNUM, 0)) |
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| 151 | *rc1 |= MAP_EFLG_SOLID; |
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| 152 | } |
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| 153 | |||
| 154 | |||
| 155 | /* |
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| 156 | * Check if x,y is within e trigger box. |
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| 157 | * |
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| 158 | * ASM 126F |
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| 159 | * return: FALSE if not in box, TRUE if in box. |
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| 160 | */ |
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| 161 | U8 u_trigbox (U8 e, S16 x, S16 y) |
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| 162 | { |
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| 163 | U16 xmax, ymax; |
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| 164 | |||
| 165 | xmax = ent_ents[e].trig_x + ((U16) ent_entdata[ent_ents[e].n & 0x7F].trig_w << 3); |
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| 166 | ymax = ent_ents[e].trig_y + ((U16) ent_entdata[ent_ents[e].n & 0x7F].trig_h << 3); |
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| 167 | |||
| 168 | if (xmax > 0xFF) |
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| 169 | xmax = 0xFF; |
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| 170 | |||
| 171 | if (x <= ent_ents[e].trig_x || x > xmax || y <= ent_ents[e].trig_y || y > ymax) |
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| 172 | return FALSE; |
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| 173 | else |
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| 174 | return TRUE; |
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| 175 | } |