cgame.c

   1
   2 #include "cgame_api.h"
   3 #include "cg_math.h"
   4
   5
   6 #ifndef NULL
   7 #define NULL ((void *)0)
   8 #endif
   9
  10 static double gametime, frametime;
  11
  12 struct localentity_s;
  13 typedef struct localentity_s
  14 {
  15         int active; // true if the entity is alive (not freed)
  16         float freetime; // time this entity was freed
  17         float dietime;
  18         vec3_t velocity;
  19         vec3_t avelocity;
  20         vec3_t worldmins;
  21         vec3_t worldmaxs;
  22         vec3_t entitymins;
  23         vec3_t entitymaxs;
  24         float bouncescale;
  25         float airfrictionscale;
  26         float gravityscale;
  27         void (*framethink)(struct localentity_s *e);
  28         //int solid;
  29         //void (*touch)(struct localentity_s *self, struct localentity_s *other);
  30         //void (*touchnetwork)(struct *localentity_s *self);
  31         cgdrawentity_t draw;
  32 }
  33 localentity_t;
  34
  35 #define MAX_LOCALENTITIES 1024
  36 static localentity_t *localentity;
  37
  38 static cgphysentity_t *phys_entity;
  39 static int phys_entities;
  40
  41 static float cg_gravity;
  42
  43 static void readvector(vec3_t v)
  44 {
  45         v[0] = CGVM_MSG_ReadFloat();
  46         v[1] = CGVM_MSG_ReadFloat();
  47         v[2] = CGVM_MSG_ReadFloat();
  48 }
  49
  50 static localentity_t *entspawn(void)
  51 {
  52         int i;
  53         localentity_t *l;
  54         for (i = 0;i < MAX_LOCALENTITIES;i++)
  55         {
  56                 l = localentity + i;
  57                 if (!l->active && l->freetime < gametime)
  58                 {
  59                         memset(l, 0, sizeof(*l));
  60                         l->active = true;
  61                         return l;
  62                 }
  63         }
  64         for (i = 0;i < MAX_LOCALENTITIES;i++)
  65         {
  66                 l = localentity + i;
  67                 if (!l->active)
  68                 {
  69                         memset(l, 0, sizeof(*l));
  70                         l->active = true;
  71                         return l;
  72                 }
  73         }
  74         return NULL;
  75 }
  76
  77 static void entremove(localentity_t *e)
  78 {
  79         memset(e, 0, sizeof(*e));
  80         e->freetime = (float)gametime + 1.0f;
  81 }
  82
  83 static void phys_setupphysentities(void)
  84 {
  85         phys_entities = 0;
  86         /*
  87         for (i = 0;i < MAX_LOCALENTITIES;i++)
  88         {
  89                 l = localentities + i;
  90                 if (l->active && l->solid)
  91                 {
  92                 }
  93         }
  94         */
  95 }
  96
  97 static void phys_moveentities(void)
  98 {
  99         int i;
 100         localentity_t *l;
 101         for (i = 0;i < MAX_LOCALENTITIES;i++)
 102         {
 103                 l = localentity + i;
 104                 if (l->active)
 105                 {
 106                         if (l->framethink)
 107                                 l->framethink(l);
 108                         if (l->active && l->draw.model)
 109                                 CGVM_Draw_Entity(&l->draw);
 110                 }
 111         }
 112 }
 113
 114 static void phys_updateentities(void)
 115 {
 116         phys_setupphysentities();
 117         phys_moveentities();
 118 }
 119
 120 static void phys_update(localentity_t *e)
 121 {
 122         vec3_t impactpos, impactnormal, end;
 123         int impactentnum;
 124         float t, f, frac, bounce;
 125         t = (float)frametime;
 126         if (t == 0)
 127                 return;
 128         VectorMA(e->draw.angles, t, e->avelocity, e->draw.angles);
 129         VectorMA(e->draw.origin, t, e->velocity, end);
 130         frac = CGVM_TracePhysics(e->draw.origin, end, e->worldmins, e->worldmaxs, e->entitymins, e->entitymaxs, phys_entity, phys_entities, impactpos, impactnormal, &impactentnum);
 131         VectorCopy(impactpos, e->draw.origin);
 132         if (frac < 1)
 133         {
 134                 bounce = DotProduct(e->velocity, impactnormal) * -e->bouncescale;
 135                 VectorMA(e->velocity, bounce, impactnormal, e->velocity);
 136                 // FIXME: do some kind of touch code here if physentities get implemented
 137
 138                 if (impactnormal[2] >= 0.7 && DotProduct(e->velocity, e->velocity) < 100*100)
 139                 {
 140                         VectorClear(e->velocity);
 141                         VectorClear(e->avelocity);
 142                 }
 143         }
 144
 145         if (e->airfrictionscale)
 146         {
 147                 if (DotProduct(e->velocity, e->velocity) < 10*10)
 148                 {
 149                         VectorClear(e->velocity);
 150                         VectorClear(e->avelocity);
 151                 }
 152                 else
 153                 {
 154                         f = 1 - (t * e->airfrictionscale);
 155                         if (f > 0)
 156                         {
 157                                 VectorScale(e->velocity, f, e->velocity);
 158                                 if (DotProduct(e->avelocity, e->avelocity) < 10*10)
 159                                 {
 160                                         VectorClear(e->avelocity);
 161                                 }
 162                                 else
 163                                 {
 164                                         VectorScale(e->avelocity, f, e->avelocity);
 165                                 }
 166                         }
 167                         else
 168                         {
 169                                 VectorClear(e->velocity);
 170                                 VectorClear(e->avelocity);
 171                         }
 172                 }
 173         }
 174         if (e->gravityscale)
 175                 e->velocity[2] += cg_gravity * e->gravityscale * t;
 176 }
 177
 178 static void explosiondebris_framethink(localentity_t *self)
 179 {
 180         if (gametime > self->dietime)
 181         {
 182                 self->draw.scale -= (float)frametime * 3.0f;
 183                 if (self->draw.scale < 0.05f)
 184                 {
 185                         entremove(self);
 186                         return;
 187                 }
 188         }
 189         phys_update(self);
 190 }
 191
 192 static void net_explosion(unsigned char num)
 193 {
 194         int i;
 195         float r;
 196         vec3_t org;
 197         double time;
 198         localentity_t *e;
 199         // need the time to know when the rubble should fade
 200         time = CGVM_Time();
 201         // read the network data
 202         readvector(org);
 203
 204         for (i = 0;i < 40;i++)
 205         {
 206                 e = entspawn();
 207                 if (!e)
 208                         return;
 209
 210                 VectorCopy(org, e->draw.origin);
 211                 e->draw.angles[0] = CGVM_RandomRange(0, 360);
 212                 e->draw.angles[1] = CGVM_RandomRange(0, 360);
 213                 e->draw.angles[2] = CGVM_RandomRange(0, 360);
 214                 VectorRandom(e->velocity);
 215                 VectorScale(e->velocity, 300, e->velocity);
 216                 e->velocity[2] -= (float)cg_gravity * 0.1f;
 217                 e->avelocity[0] = CGVM_RandomRange(0, 1440);
 218                 e->avelocity[1] = CGVM_RandomRange(0, 1440);
 219                 e->avelocity[2] = CGVM_RandomRange(0, 1440);
 220                 r = CGVM_RandomRange(0, 3);
 221                 if (r < 1)
 222                         e->draw.model = CGVM_Model("progs/rubble1.mdl");
 223                 else if (r < 2)
 224                         e->draw.model = CGVM_Model("progs/rubble2.mdl");
 225                 else
 226                         e->draw.model = CGVM_Model("progs/rubble3.mdl");
 227                 e->draw.alpha = 1;
 228                 e->draw.scale = 1;
 229                 e->draw.frame1 = 0;
 230                 e->draw.frame2 = 0;
 231                 e->draw.framelerp = 0;
 232                 e->draw.skinnum = 5;
 233                 VectorSet(e->worldmins, 0, 0, -8);
 234                 VectorSet(e->worldmaxs, 0, 0, -8);
 235                 VectorSet(e->entitymins, -8, -8, -8);
 236                 VectorSet(e->entitymaxs, 8, 8, 8);
 237                 e->bouncescale = 1.4f;
 238                 e->gravityscale = 1;
 239                 e->airfrictionscale = 1;
 240                 e->framethink = explosiondebris_framethink;
 241                 e->dietime = (float)time + 5.0f;
 242         }
 243 }
 244
 245 // called by engine
 246 void CG_Init(void)
 247 {
 248         localentity = CGVM_Malloc(sizeof(localentity_t) * MAX_LOCALENTITIES);
 249         phys_entity = CGVM_Malloc(sizeof(cgphysentity_t) * MAX_LOCALENTITIES);
 250         CGVM_RegisterNetworkCode(1, net_explosion);
 251         gametime = 0;
 252 }
 253
 254 // called by engine
 255 void CG_Frame(double time)
 256 {
 257         cg_gravity = -CGVM_GetCvarFloat("sv_gravity");
 258         frametime = time - gametime;
 259         gametime = time;
 260         phys_updateentities();
 261 }
 262