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annotate src/creep.c @ 13:d118fe8fb1db

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Make cursor and creeps play nice
author Mike Pavone <pavone@retrodev.com>
date Sun, 12 Jan 2014 17:19:42 -0800
parents c0bb53eaa6f4
children 5c7f33441e43
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1 #include <genesis.h>
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2 #include "creep.h"
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3
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4 creep creeps[MAX_CREEPS];
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5 u16 cur_creeps;
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6 extern u16 tilemap[40*28];
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7
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8 u16 distances[20*14];
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9
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10 u16 spawn_creep(u8 species, s16 x, s16 y)
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11 {
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12 u16 index;
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13 for (index = 0; index < MAX_SPRITE; index++)
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14 {
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15 if (spriteDefCache[index].posx == -0x80) {
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16 break;
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17 }
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18 }
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19 if (index > 0) {
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20 VDP_setSprite(index, x, y, SPRITE_SIZE(1, 1), TILE_ATTR_FULL(2, 0, 0, 0, 'C' + TILE_FONTINDEX), spriteDefCache[0].link);
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21 spriteDefCache[0].link = index;
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22 } else {
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23 VDP_setSprite(index, x, y, SPRITE_SIZE(1, 1), TILE_ATTR_FULL(2, 0, 0, 0, 'C' + TILE_FONTINDEX), 0);
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24 }
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25 creeps[cur_creeps].index = index;
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26 creeps[cur_creeps].health = 1000;
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27 creeps[cur_creeps].species = species;
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28 creeps[cur_creeps].direction = 0;
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29 return cur_creeps++;
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30 }
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31
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32 typedef struct {
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33 u16 index;
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34 u16 x;
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35 u16 y;
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36 } mpoint;
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37
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38 s16 explore(mpoint * points, s16 num_points, u16 src, u16 srcx, u16 srcy)
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39 {
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40 u16 x,y,index,cindex,xmax,ymax,ystrt,dist;
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41 dist = distances[src]+1;
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42 xmax = srcx < 19 ? srcx+1 : srcx;
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43 ymax = srcy < 13 ? srcy+1 : srcy;
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44 if (srcy)
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45 {
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46 ystrt = srcy-1;
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47 cindex = srcx ? src - 21 : src - 20;
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48 } else {
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49 ystrt = srcy;
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50 cindex = srcx ? src - 1 : src;
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51 }
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52 for (x = srcx ? srcx-1 : srcx; x <= xmax; x++, cindex++)
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53 {
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54 for (y = ystrt, index=cindex; y<=ymax; y++,index+=20)
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55 {
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56 if (distances[index] > dist && !tilemap[x*2+y*2*40])
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57 {
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58 distances[index] = dist;
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59 if (dist == 0xFFFF)
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60 {
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61 tilemap[x*2 + y*2*40] = TILE_ATTR_FULL(2, 0, 0, 0, 'E' - 32 + TILE_FONTINDEX);
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62 }
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63 points[num_points].index = index;
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64 points[num_points].x = x;
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65 points[num_points++].y = y;
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66 }
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67 }
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68 }
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69 return num_points;
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70 }
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71
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72 void gen_distances(u16 x, u16 y)
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73 {
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74 //TODO: Figure out the actual maximum number of candidate points that can exist
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75 mpoint pointsa[20*14];
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76 mpoint pointsb[20*14];
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77 mpoint *points=pointsa;
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78 mpoint *new_points;
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79 s16 num_points = 0, old_points;
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80 x /= 2;
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81 y /= 2;
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82 memset(distances, 0xFF, sizeof(distances));
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83
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84 distances[x + y*20] = 0;
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85 num_points = explore(points, num_points, x + y*20, x, y);
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86
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87 while (num_points)
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88 {
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89 new_points = points == pointsa ? pointsb : pointsa;
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90 old_points = num_points;
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91 for (num_points = 0, old_points--; old_points >= 0; old_points--)
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92 {
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93 num_points = explore(new_points, num_points, points[old_points].index, points[old_points].x, points[old_points].y);
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94 }
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95 points = new_points;
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96 }
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97 }
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98
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99 void print_distances()
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100 {
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101 u16 x,y,tindex,dindex,dist;
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102 for (y = 0; y < 14; y++)
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103 {
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104 dindex = y * 20;
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105 tindex = y * 2 * 40;
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106 for (x = 0; x < 20; x++, dindex++, tindex += 2)
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107 {
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108 dist = distances[dindex];
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109 if (dist < 10000)
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110 {
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111 tilemap[tindex+41] = TILE_ATTR_FULL(3, 0, 0, 0, '0' - 32 + dist % 10 + TILE_FONTINDEX);
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112 dist /= 10;
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113 if (dist)
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114 {
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115 tilemap[tindex+40] = TILE_ATTR_FULL(3, 0, 0, 0, '0' - 32 + dist % 10 + TILE_FONTINDEX);
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116 dist /= 10;
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117 if (dist)
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118 {
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119 tilemap[tindex+1] = TILE_ATTR_FULL(3, 0, 0, 0, '0' - 32 + dist % 10 + TILE_FONTINDEX);
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120 dist /= 10;
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121 if (dist)
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122 tilemap[tindex] = TILE_ATTR_FULL(3, 0, 0, 0, '0' - 32 + dist % 10 + TILE_FONTINDEX);
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123 }
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124 }
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125 }
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126 }
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127 }
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128 }