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 #define MAX_EXPLOSIONS 64
  25 #define EXPLOSIONGRID 8
  26 #define EXPLOSIONVERTS ((EXPLOSIONGRID+1)*(EXPLOSIONGRID+1))
  27 #define EXPLOSIONTRIS (EXPLOSIONGRID*EXPLOSIONGRID*2)
  28
  29 static float explosiontexcoord2f[EXPLOSIONVERTS][2];
  30 static int explosiontris[EXPLOSIONTRIS][3];
  31 static int explosionnoiseindex[EXPLOSIONVERTS];
  32 static vec3_t explosionpoint[EXPLOSIONVERTS];
  33
  34 typedef struct explosion_s
  35 {
  36         float starttime;
  37         float endtime;
  38         float time;
  39         float alpha;
  40         float fade;
  41         vec3_t origin;
  42         vec3_t vert[EXPLOSIONVERTS];
  43         vec3_t vertvel[EXPLOSIONVERTS];
  44         qboolean clipping;
  45 }
  46 explosion_t;
  47
  48 static explosion_t explosion[MAX_EXPLOSIONS];
  49
  50 static rtexture_t       *explosiontexture;
  51 static rtexture_t       *explosiontexturefog;
  52
  53 static rtexturepool_t   *explosiontexturepool;
  54
  55 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1", "enables collision detection for explosion shell (so that it flattens against walls and floors)"};
  56 static cvar_t r_drawexplosions = {0, "r_drawexplosions", "1", "enables rendering of explosion shells (see also cl_particles_explosions_shell)"};
  57
  58 static void r_explosion_start(void)
  59 {
  60         int x, y;
  61         unsigned char noise1[128][128], noise2[128][128], noise3[128][128], data[128][128][4];
  62         explosiontexturepool = R_AllocTexturePool();
  63         fractalnoise(&noise1[0][0], 128, 32);
  64         fractalnoise(&noise2[0][0], 128, 4);
  65         fractalnoise(&noise3[0][0], 128, 4);
  66         for (y = 0;y < 128;y++)
  67         {
  68                 for (x = 0;x < 128;x++)
  69                 {
  70                         int j, r, g, b, a;
  71                         j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
  72                         r = (j * 512) / 256;
  73                         g = (j * 256) / 256;
  74                         b = (j * 128) / 256;
  75                         a = noise3[y][x] * 3 - 128;
  76                         data[y][x][0] = bound(0, r, 255);
  77                         data[y][x][1] = bound(0, g, 255);
  78                         data[y][x][2] = bound(0, b, 255);
  79                         data[y][x][3] = bound(0, a, 255);
  80                 }
  81         }
  82         explosiontexture = R_LoadTexture2D(explosiontexturepool, "explosiontexture", 128, 128, &data[0][0][0], TEXTYPE_RGBA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE, NULL);
  83         for (y = 0;y < 128;y++)
  84                 for (x = 0;x < 128;x++)
  85                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
  86         explosiontexturefog = R_LoadTexture2D(explosiontexturepool, "explosiontexturefog", 128, 128, &data[0][0][0], TEXTYPE_RGBA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE, NULL);
  87         // note that explosions survive the restart
  88 }
  89
  90 static void r_explosion_shutdown(void)
  91 {
  92         R_FreeTexturePool(&explosiontexturepool);
  93 }
  94
  95 static void r_explosion_newmap(void)
  96 {
  97         memset(explosion, 0, sizeof(explosion));
  98 }
  99
 100 static int R_ExplosionVert(int column, int row)
 101 {
 102         int i;
 103         float yaw, pitch;
 104         // top and bottom rows are all one position...
 105         if (row == 0 || row == EXPLOSIONGRID)
 106                 column = 0;
 107         i = row * (EXPLOSIONGRID + 1) + column;
 108         yaw = ((double) column / EXPLOSIONGRID) * M_PI * 2;
 109         pitch = (((double) row / EXPLOSIONGRID) - 0.5) * M_PI;
 110         explosionpoint[i][0] = cos(yaw) *  cos(pitch);
 111         explosionpoint[i][1] = sin(yaw) *  cos(pitch);
 112         explosionpoint[i][2] =        1 * -sin(pitch);
 113         explosiontexcoord2f[i][0] = (float) column / (float) EXPLOSIONGRID;
 114         explosiontexcoord2f[i][1] = (float) row / (float) EXPLOSIONGRID;
 115         explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
 116         return i;
 117 }
 118
 119 void R_Explosion_Init(void)
 120 {
 121         int i, x, y;
 122         i = 0;
 123         for (y = 0;y < EXPLOSIONGRID;y++)
 124         {
 125                 for (x = 0;x < EXPLOSIONGRID;x++)
 126                 {
 127                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 128                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 129                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 130                         i++;
 131                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 132                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 133                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 134                         i++;
 135                 }
 136         }
 137
 138         Cvar_RegisterVariable(&r_explosionclip);
 139         Cvar_RegisterVariable(&r_drawexplosions);
 140
 141         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
 142 }
 143
 144 void R_NewExplosion(const vec3_t org)
 145 {
 146         int i, j;
 147         float dist, n;
 148         explosion_t *e;
 149         trace_t trace;
 150         unsigned char noise[EXPLOSIONGRID*EXPLOSIONGRID];
 151         fractalnoisequick(noise, EXPLOSIONGRID, 4); // adjust noise grid size according to explosion
 152         for (i = 0, e = explosion;i < MAX_EXPLOSIONS;i++, e++)
 153         {
 154                 if (cl.time >= e->endtime)
 155                 {
 156                         e->starttime = cl.time;
 157                         e->endtime = cl.time + cl_explosions_lifetime.value;
 158                         e->time = e->starttime;
 159                         e->alpha = cl_explosions_alpha_start.value;
 160                         e->fade = (cl_explosions_alpha_start.value - cl_explosions_alpha_end.value) / cl_explosions_lifetime.value;
 161                         e->clipping = r_explosionclip.integer != 0;
 162                         VectorCopy(org, e->origin);
 163                         for (j = 0;j < EXPLOSIONVERTS;j++)
 164                         {
 165                                 // calculate start origin and velocity
 166                                 n = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
 167                                 dist = n * cl_explosions_size_start.value;
 168                                 VectorMA(e->origin, dist, explosionpoint[j], e->vert[j]);
 169                                 dist = n * (cl_explosions_size_end.value - cl_explosions_size_start.value) / cl_explosions_lifetime.value;
 170                                 VectorScale(explosionpoint[j], dist, e->vertvel[j]);
 171                                 // clip start origin
 172                                 if (e->clipping)
 173                                 {
 174                                         trace = CL_TraceBox(e->origin, vec3_origin, vec3_origin, e->vert[j], true, NULL, SUPERCONTENTS_SOLID, false);
 175                                         VectorCopy(trace.endpos, e->vert[i]);
 176                                 }
 177                         }
 178                         break;
 179                 }
 180         }
 181 }
 182
 183 static void R_DrawExplosion_TransparentCallback(const entity_render_t *ent, int surfacenumber, const rtlight_t *rtlight)
 184 {
 185         const explosion_t *e = explosion + surfacenumber;
 186         int numtriangles, numverts;
 187         float alpha;
 188         rmeshstate_t m;
 189
 190         GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
 191         GL_DepthMask(false);
 192         GL_DepthTest(true);
 193         R_Mesh_Matrix(&identitymatrix);
 194
 195         numtriangles = EXPLOSIONTRIS;
 196         numverts = EXPLOSIONVERTS;
 197         alpha = e->alpha;
 198
 199         memset(&m, 0, sizeof(m));
 200         m.tex[0] = R_GetTexture(explosiontexture);
 201         m.pointer_texcoord[0] = explosiontexcoord2f[0];
 202         m.pointer_vertex = e->vert[0];
 203         R_Mesh_State(&m);
 204
 205         GL_Color(alpha, alpha, alpha, 1);
 206
 207         GL_LockArrays(0, numverts);
 208         R_Mesh_Draw(0, numverts, numtriangles, explosiontris[0]);
 209         GL_LockArrays(0, 0);
 210 }
 211
 212 static void R_MoveExplosion(explosion_t *e)
 213 {
 214         int i;
 215         float dot, end[3], frametime;
 216         trace_t trace;
 217
 218         frametime = cl.time - e->time;
 219         e->time = cl.time;
 220         e->alpha = e->alpha - (e->fade * frametime);
 221         for (i = 0;i < EXPLOSIONVERTS;i++)
 222         {
 223                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 224                 {
 225                         VectorMA(e->vert[i], frametime, e->vertvel[i], end);
 226                         if (e->clipping)
 227                         {
 228                                 trace = CL_TraceBox(e->vert[i], vec3_origin, vec3_origin, end, true, NULL, SUPERCONTENTS_SOLID, false);
 229                                 if (trace.fraction < 1)
 230                                 {
 231                                         // clip velocity against the wall
 232                                         dot = -DotProduct(e->vertvel[i], trace.plane.normal);
 233                                         VectorMA(e->vertvel[i], dot, trace.plane.normal, e->vertvel[i]);
 234                                 }
 235                                 VectorCopy(trace.endpos, e->vert[i]);
 236                         }
 237                         else
 238                                 VectorCopy(end, e->vert[i]);
 239                 }
 240         }
 241 }
 242
 243
 244 void R_MoveExplosions(void)
 245 {
 246         int i;
 247         for (i = 0;i < MAX_EXPLOSIONS;i++)
 248                 if (cl.time < explosion[i].endtime)
 249                         R_MoveExplosion(&explosion[i]);
 250 }
 251
 252 void R_DrawExplosions(void)
 253 {
 254         int i;
 255
 256         if (!r_drawexplosions.integer)
 257                 return;
 258         for (i = 0;i < MAX_EXPLOSIONS;i++)
 259                 if (r_refdef.time < explosion[i].endtime)
 260                         R_MeshQueue_AddTransparent(explosion[i].origin, R_DrawExplosion_TransparentCallback, NULL, i, NULL);
 261 }
 262