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 #define EXPLOSIONSTARTVELOCITY (256.0f)
  29 #define EXPLOSIONFADESTART (1.5f)
  30 #define EXPLOSIONFADERATE (3.0f)
  31
  32 float explosiontexcoord2f[EXPLOSIONVERTS][2];
  33 int explosiontris[EXPLOSIONTRIS][3];
  34 int explosionnoiseindex[EXPLOSIONVERTS];
  35 vec3_t explosionpoint[EXPLOSIONVERTS];
  36 vec3_t explosionspherevertvel[EXPLOSIONVERTS];
  37
  38 typedef struct explosion_s
  39 {
  40         float starttime;
  41         float time;
  42         float alpha;
  43         vec3_t origin;
  44         vec3_t vert[EXPLOSIONVERTS];
  45         vec3_t vertvel[EXPLOSIONVERTS];
  46 }
  47 explosion_t;
  48
  49 explosion_t explosion[MAX_EXPLOSIONS];
  50
  51 rtexture_t      *explosiontexture;
  52 rtexture_t      *explosiontexturefog;
  53
  54 rtexturepool_t  *explosiontexturepool;
  55
  56 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1"};
  57 cvar_t r_drawexplosions = {0, "r_drawexplosions", "1"};
  58
  59 void r_explosion_start(void)
  60 {
  61         int x, y;
  62         qbyte noise1[128][128], noise2[128][128], noise3[128][128], data[128][128][4];
  63         explosiontexturepool = R_AllocTexturePool();
  64         fractalnoise(&noise1[0][0], 128, 32);
  65         fractalnoise(&noise2[0][0], 128, 4);
  66         fractalnoise(&noise3[0][0], 128, 4);
  67         for (y = 0;y < 128;y++)
  68         {
  69                 for (x = 0;x < 128;x++)
  70                 {
  71                         int j, r, g, b, a;
  72                         j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
  73                         r = (j * 512) / 256;
  74                         g = (j * 256) / 256;
  75                         b = (j * 128) / 256;
  76                         a = noise3[y][x] * 3 - 128;
  77                         data[y][x][0] = bound(0, r, 255);
  78                         data[y][x][1] = bound(0, g, 255);
  79                         data[y][x][2] = bound(0, b, 255);
  80                         data[y][x][3] = bound(0, a, 255);
  81                 }
  82         }
  83         explosiontexture = R_LoadTexture2D(explosiontexturepool, "explosiontexture", 128, 128, &data[0][0][0], TEXTYPE_RGBA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE, NULL);
  84         for (y = 0;y < 128;y++)
  85                 for (x = 0;x < 128;x++)
  86                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
  87         explosiontexturefog = R_LoadTexture2D(explosiontexturepool, "explosiontexturefog", 128, 128, &data[0][0][0], TEXTYPE_RGBA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE, NULL);
  88         // note that explosions survive the restart
  89 }
  90
  91 void r_explosion_shutdown(void)
  92 {
  93         R_FreeTexturePool(&explosiontexturepool);
  94 }
  95
  96 void r_explosion_newmap(void)
  97 {
  98         memset(explosion, 0, sizeof(explosion));
  99 }
 100
 101 int R_ExplosionVert(int column, int row)
 102 {
 103         int i;
 104         float yaw, pitch;
 105         // top and bottom rows are all one position...
 106         if (row == 0 || row == EXPLOSIONGRID)
 107                 column = 0;
 108         i = row * (EXPLOSIONGRID + 1) + column;
 109         yaw = ((double) column / EXPLOSIONGRID) * M_PI * 2;
 110         pitch = (((double) row / EXPLOSIONGRID) - 0.5) * M_PI;
 111         explosionpoint[i][0] = cos(yaw) *  cos(pitch);
 112         explosionpoint[i][1] = sin(yaw) *  cos(pitch);
 113         explosionpoint[i][2] =        1 * -sin(pitch);
 114         explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
 115         explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
 116         explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
 117         explosiontexcoord2f[i][0] = (float) column / (float) EXPLOSIONGRID;
 118         explosiontexcoord2f[i][1] = (float) row / (float) EXPLOSIONGRID;
 119         explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
 120         return i;
 121 }
 122
 123 void R_Explosion_Init(void)
 124 {
 125         int i, x, y;
 126         i = 0;
 127         for (y = 0;y < EXPLOSIONGRID;y++)
 128         {
 129                 for (x = 0;x < EXPLOSIONGRID;x++)
 130                 {
 131                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 132                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 133                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 134                         i++;
 135                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 136                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 137                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 138                         i++;
 139                 }
 140         }
 141
 142         Cvar_RegisterVariable(&r_explosionclip);
 143         Cvar_RegisterVariable(&r_drawexplosions);
 144
 145         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
 146 }
 147
 148 void R_NewExplosion(vec3_t org)
 149 {
 150         int i, j;
 151         float dist;
 152         qbyte noise[EXPLOSIONGRID*EXPLOSIONGRID];
 153         fractalnoisequick(noise, EXPLOSIONGRID, 4); // adjust noise grid size according to explosion
 154         for (i = 0;i < MAX_EXPLOSIONS;i++)
 155         {
 156                 if (explosion[i].alpha <= 0.01f)
 157                 {
 158                         explosion[i].starttime = cl.time;
 159                         explosion[i].time = explosion[i].starttime - 0.1;
 160                         explosion[i].alpha = EXPLOSIONFADESTART;
 161                         VectorCopy(org, explosion[i].origin);
 162                         for (j = 0;j < EXPLOSIONVERTS;j++)
 163                         {
 164                                 // calculate start
 165                                 VectorCopy(explosion[i].origin, explosion[i].vert[j]);
 166                                 // calculate velocity
 167                                 dist = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
 168                                 VectorScale(explosionspherevertvel[j], dist, explosion[i].vertvel[j]);
 169                         }
 170                         break;
 171                 }
 172         }
 173 }
 174
 175 void R_DrawExplosionCallback(const void *calldata1, int calldata2)
 176 {
 177         int numtriangles, numverts;
 178         float alpha;
 179         rmeshstate_t m;
 180         const explosion_t *e;
 181         e = calldata1;
 182
 183         GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
 184         GL_DepthMask(false);
 185         GL_DepthTest(true);
 186         R_Mesh_Matrix(&r_identitymatrix);
 187
 188         numtriangles = EXPLOSIONTRIS;
 189         numverts = EXPLOSIONVERTS;
 190         alpha = e->alpha;
 191         GL_Color(alpha, alpha, alpha, 1);
 192         GL_VertexPointer(e->vert[0]);
 193
 194         memset(&m, 0, sizeof(m));
 195         m.tex[0] = R_GetTexture(explosiontexture);
 196         m.pointer_texcoord[0] = explosiontexcoord2f[0];
 197         R_Mesh_State_Texture(&m);
 198
 199         R_Mesh_Draw(numverts, numtriangles, explosiontris[0]);
 200 }
 201
 202 void R_MoveExplosion(explosion_t *e)
 203 {
 204         int i;
 205         float dot, frictionscale, end[3], impact[3], normal[3], frametime;
 206
 207         frametime = cl.time - e->time;
 208         e->time = cl.time;
 209         e->alpha = EXPLOSIONFADESTART - (cl.time - e->starttime) * EXPLOSIONFADERATE;
 210         if (e->alpha <= 0.01f)
 211         {
 212                 e->alpha = -1;
 213                 return;
 214         }
 215         frictionscale = 1 - frametime;
 216         frictionscale = bound(0, frictionscale, 1);
 217         for (i = 0;i < EXPLOSIONVERTS;i++)
 218         {
 219                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 220                 {
 221                         VectorScale(e->vertvel[i], frictionscale, e->vertvel[i]);
 222                         VectorMA(e->vert[i], frametime, e->vertvel[i], end);
 223                         if (r_explosionclip.integer)
 224                         {
 225                                 if (CL_TraceLine(e->vert[i], end, impact, normal, true, NULL, SUPERCONTENTS_SOLID) < 1)
 226                                 {
 227                                         // clip velocity against the wall
 228                                         dot = DotProduct(e->vertvel[i], normal) * -1.125f;
 229                                         VectorMA(e->vertvel[i], dot, normal, e->vertvel[i]);
 230                                 }
 231                                 VectorCopy(impact, e->vert[i]);
 232                         }
 233                         else
 234                                 VectorCopy(end, e->vert[i]);
 235                 }
 236         }
 237 }
 238
 239
 240 void R_MoveExplosions(void)
 241 {
 242         int i;
 243         float frametime;
 244
 245         frametime = cl.time - cl.oldtime;
 246
 247         for (i = 0;i < MAX_EXPLOSIONS;i++)
 248                 if (explosion[i].alpha > 0.01f)
 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 (explosion[i].alpha > 0.01f)
 260                         R_MeshQueue_AddTransparent(explosion[i].origin, R_DrawExplosionCallback, &explosion[i], 0);
 261 }
 262