r_explosion.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3
   4 This program is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU General Public License
   6 as published by the Free Software Foundation; either version 2
   7 of the License, or (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  12
  13 See the GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18
  19 */
  20
  21 #include "quakedef.h"
  22 #include "cl_collision.h"
  23
  24 #ifdef MAX_EXPLOSIONS
  25 #define EXPLOSIONGRID 8
  26 #define EXPLOSIONVERTS ((EXPLOSIONGRID+1)*(EXPLOSIONGRID+1))
  27 #define EXPLOSIONTRIS (EXPLOSIONGRID*EXPLOSIONGRID*2)
  28
  29 static int numexplosions = 0;
  30
  31 static float explosiontexcoord2f[EXPLOSIONVERTS][2];
  32 static unsigned short explosiontris[EXPLOSIONTRIS][3];
  33 static int explosionnoiseindex[EXPLOSIONVERTS];
  34 static vec3_t explosionpoint[EXPLOSIONVERTS];
  35
  36 typedef struct explosion_s
  37 {
  38         float starttime;
  39         float endtime;
  40         float time;
  41         float alpha;
  42         float fade;
  43         vec3_t origin;
  44         vec3_t vert[EXPLOSIONVERTS];
  45         vec3_t vertvel[EXPLOSIONVERTS];
  46         qbool clipping;
  47 }
  48 explosion_t;
  49
  50 static explosion_t explosion[MAX_EXPLOSIONS];
  51
  52 static rtexture_t       *explosiontexture;
  53 //static rtexture_t     *explosiontexturefog;
  54
  55 static rtexturepool_t   *explosiontexturepool;
  56 #endif
  57
  58 cvar_t r_explosionclip = {CF_CLIENT | CF_ARCHIVE, "r_explosionclip", "1", "enables collision detection for explosion shell (so that it flattens against walls and floors)"};
  59 #ifdef MAX_EXPLOSIONS
  60 static cvar_t r_drawexplosions = {CF_CLIENT, "r_drawexplosions", "1", "enables rendering of explosion shells (see also cl_particles_explosions_shell)"};
  61
  62 //extern qbool r_loadfog;
  63 static void r_explosion_start(void)
  64 {
  65         int x, y;
  66         static unsigned char noise1[128][128], noise2[128][128], noise3[128][128], data[128][128][4];
  67         explosiontexturepool = R_AllocTexturePool();
  68         explosiontexture = NULL;
  69         //explosiontexturefog = NULL;
  70         fractalnoise(&noise1[0][0], 128, 32);
  71         fractalnoise(&noise2[0][0], 128, 4);
  72         fractalnoise(&noise3[0][0], 128, 4);
  73         for (y = 0;y < 128;y++)
  74         {
  75                 for (x = 0;x < 128;x++)
  76                 {
  77                         int j, r, g, b, a;
  78                         j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
  79                         r = (j * 512) / 256;
  80                         g = (j * 256) / 256;
  81                         b = (j * 128) / 256;
  82                         a = noise3[y][x] * 3 - 128;
  83                         data[y][x][2] = bound(0, r, 255);
  84                         data[y][x][1] = bound(0, g, 255);
  85                         data[y][x][0] = bound(0, b, 255);
  86                         data[y][x][3] = bound(0, a, 255);
  87                 }
  88         }
  89         explosiontexture = R_LoadTexture2D(explosiontexturepool, "explosiontexture", 128, 128, &data[0][0][0], TEXTYPE_BGRA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_FORCELINEAR, -1, NULL);
  90 //      if (r_loadfog)
  91 //      {
  92 //              for (y = 0;y < 128;y++)
  93 //                      for (x = 0;x < 128;x++)
  94 //                              data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
  95 //              explosiontexturefog = R_LoadTexture2D(explosiontexturepool, "explosiontexture_fog", 128, 128, &data[0][0][0], TEXTYPE_BGRA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_FORCELINEAR, NULL);
  96 //      }
  97         // note that explosions survive the restart
  98 }
  99
 100 static void r_explosion_shutdown(void)
 101 {
 102         R_FreeTexturePool(&explosiontexturepool);
 103 }
 104
 105 static void r_explosion_newmap(void)
 106 {
 107         numexplosions = 0;
 108         memset(explosion, 0, sizeof(explosion));
 109 }
 110
 111 static int R_ExplosionVert(int column, int row)
 112 {
 113         int i;
 114         float yaw, pitch;
 115         // top and bottom rows are all one position...
 116         if (row == 0 || row == EXPLOSIONGRID)
 117                 column = 0;
 118         i = row * (EXPLOSIONGRID + 1) + column;
 119         yaw = ((double) column / EXPLOSIONGRID) * M_PI * 2;
 120         pitch = (((double) row / EXPLOSIONGRID) - 0.5) * M_PI;
 121         explosionpoint[i][0] = cos(yaw) *  cos(pitch);
 122         explosionpoint[i][1] = sin(yaw) *  cos(pitch);
 123         explosionpoint[i][2] =        1 * -sin(pitch);
 124         explosiontexcoord2f[i][0] = (float) column / (float) EXPLOSIONGRID;
 125         explosiontexcoord2f[i][1] = (float) row / (float) EXPLOSIONGRID;
 126         explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
 127         return i;
 128 }
 129 #endif
 130
 131 void R_Explosion_Init(void)
 132 {
 133 #ifdef MAX_EXPLOSIONS
 134         int i, x, y;
 135         i = 0;
 136         for (y = 0;y < EXPLOSIONGRID;y++)
 137         {
 138                 for (x = 0;x < EXPLOSIONGRID;x++)
 139                 {
 140                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 141                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 142                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 143                         i++;
 144                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 145                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 146                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 147                         i++;
 148                 }
 149         }
 150
 151 #endif
 152         Cvar_RegisterVariable(&r_explosionclip);
 153 #ifdef MAX_EXPLOSIONS
 154         Cvar_RegisterVariable(&r_drawexplosions);
 155
 156         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap, NULL, NULL);
 157 #endif
 158 }
 159
 160 void R_Explosion_Init_Commands(void)
 161 {
 162         Cvar_RegisterVariable(&r_explosionclip);
 163 #ifdef MAX_EXPLOSIONS
 164         Cvar_RegisterVariable(&r_drawexplosions);
 165 #endif
 166 }
 167
 168 void R_NewExplosion(const vec3_t org)
 169 {
 170 #ifdef MAX_EXPLOSIONS
 171         int i, j;
 172         float dist, n;
 173         explosion_t *e;
 174         trace_t trace;
 175         unsigned char noise[EXPLOSIONGRID*EXPLOSIONGRID];
 176         fractalnoisequick(noise, EXPLOSIONGRID, 4); // adjust noise grid size according to explosion
 177         for (i = 0, e = explosion;i < MAX_EXPLOSIONS;i++, e++)
 178         {
 179                 if (!e->alpha)
 180                 {
 181                         numexplosions = max(numexplosions, i + 1);
 182                         e->starttime = cl.time;
 183                         e->endtime = cl.time + cl_explosions_lifetime.value;
 184                         e->time = e->starttime;
 185                         e->alpha = cl_explosions_alpha_start.value;
 186                         e->fade = (cl_explosions_alpha_start.value - cl_explosions_alpha_end.value) / cl_explosions_lifetime.value;
 187                         e->clipping = r_explosionclip.integer != 0;
 188                         VectorCopy(org, e->origin);
 189                         for (j = 0;j < EXPLOSIONVERTS;j++)
 190                         {
 191                                 // calculate start origin and velocity
 192                                 n = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
 193                                 dist = n * cl_explosions_size_start.value;
 194                                 VectorMA(e->origin, dist, explosionpoint[j], e->vert[j]);
 195                                 dist = n * (cl_explosions_size_end.value - cl_explosions_size_start.value) / cl_explosions_lifetime.value;
 196                                 VectorScale(explosionpoint[j], dist, e->vertvel[j]);
 197                                 // clip start origin
 198                                 if (e->clipping)
 199                                 {
 200                                         trace = CL_TraceLine(e->origin, e->vert[j], MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, 0, 0, collision_extendmovelength.value, true, false, NULL, false, false);
 201                                         VectorCopy(trace.endpos, e->vert[i]);
 202                                 }
 203                         }
 204                         break;
 205                 }
 206         }
 207 #endif
 208 }
 209
 210 #ifdef MAX_EXPLOSIONS
 211 static void R_DrawExplosion_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
 212 {
 213         int surfacelistindex = 0;
 214         const int numtriangles = EXPLOSIONTRIS, numverts = EXPLOSIONVERTS;
 215         GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
 216         GL_DepthMask(false);
 217         GL_DepthRange(0, 1);
 218         GL_PolygonOffset(r_refdef.polygonfactor, r_refdef.polygonoffset);
 219         GL_DepthTest(true);
 220         GL_CullFace(r_refdef.view.cullface_back);
 221         R_EntityMatrix(&identitymatrix);
 222
 223 //      R_Mesh_ResetTextureState();
 224         R_SetupShader_Generic(explosiontexture, false, false, false);
 225         for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
 226         {
 227                 const explosion_t *e = explosion + surfacelist[surfacelistindex];
 228                 // FIXME: this can't properly handle r_refdef.view.colorscale > 1
 229                 GL_Color(e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, 1);
 230                 R_Mesh_PrepareVertices_Generic_Arrays(numverts, e->vert[0], NULL, explosiontexcoord2f[0]);
 231                 R_Mesh_Draw(0, numverts, 0, numtriangles, NULL, NULL, 0, explosiontris[0], NULL, 0);
 232         }
 233 }
 234
 235 static void R_MoveExplosion(explosion_t *e)
 236 {
 237         int i;
 238         float dot, end[3], frametime;
 239         trace_t trace;
 240
 241         frametime = cl.time - e->time;
 242         e->time = cl.time;
 243         e->alpha = e->alpha - (e->fade * frametime);
 244         if (e->alpha < 0 || cl.time > e->endtime)
 245         {
 246                 e->alpha = 0;
 247                 return;
 248         }
 249         for (i = 0;i < EXPLOSIONVERTS;i++)
 250         {
 251                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 252                 {
 253                         VectorMA(e->vert[i], frametime, e->vertvel[i], end);
 254                         if (e->clipping)
 255                         {
 256                                 trace = CL_TraceLine(e->vert[i], end, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, 0, 0, collision_extendmovelength.value, true, false, NULL, false, false);
 257                                 if (trace.fraction < 1)
 258                                 {
 259                                         // clip velocity against the wall
 260                                         dot = -DotProduct(e->vertvel[i], trace.plane.normal);
 261                                         VectorMA(e->vertvel[i], dot, trace.plane.normal, e->vertvel[i]);
 262                                 }
 263                                 VectorCopy(trace.endpos, e->vert[i]);
 264                         }
 265                         else
 266                                 VectorCopy(end, e->vert[i]);
 267                 }
 268         }
 269 }
 270 #endif
 271
 272 void R_DrawExplosions(void)
 273 {
 274 #ifdef MAX_EXPLOSIONS
 275         int i;
 276
 277         if (!r_drawexplosions.integer)
 278                 return;
 279
 280         for (i = 0;i < numexplosions;i++)
 281         {
 282                 if (explosion[i].alpha)
 283                 {
 284                         R_MoveExplosion(&explosion[i]);
 285                         if (explosion[i].alpha)
 286                                 R_MeshQueue_AddTransparent(TRANSPARENTSORT_DISTANCE, explosion[i].origin, R_DrawExplosion_TransparentCallback, NULL, i, NULL);
 287                 }
 288         }
 289         while (numexplosions > 0 && explosion[i-1].alpha <= 0)
 290                 numexplosions--;
 291 #endif
 292 }
 293