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
  23 float TraceLine (vec3_t start, vec3_t end, vec3_t impact, vec3_t normal);
  24
  25 #define MAX_EXPLOSIONS 64
  26 #define EXPLOSIONGRID 16
  27 #define EXPLOSIONVERTS ((EXPLOSIONGRID+1)*(EXPLOSIONGRID+1))
  28 #define EXPLOSIONTRIS (EXPLOSIONVERTS*2)
  29 #define EXPLOSIONSTARTRADIUS (0.0f)
  30 #define EXPLOSIONSTARTVELOCITY (500.0f)
  31 #define EXPLOSIONFADESTART (1.5f)
  32 #define EXPLOSIONFADERATE (6.0f)
  33
  34 vec3_t explosionspherevert[EXPLOSIONVERTS];
  35 vec3_t explosionspherevertvel[EXPLOSIONVERTS];
  36 float explosiontexcoords[EXPLOSIONVERTS][2];
  37 int explosiontris[EXPLOSIONTRIS][3];
  38 int explosionnoiseindex[EXPLOSIONVERTS];
  39 vec3_t explosionpoint[EXPLOSIONVERTS];
  40
  41 typedef struct explosion_s
  42 {
  43         float starttime;
  44         float alpha;
  45         vec3_t vert[EXPLOSIONVERTS];
  46         vec3_t vertvel[EXPLOSIONVERTS];
  47 }
  48 explosion_t;
  49
  50 explosion_t explosion[128];
  51
  52 rtexture_t      *explosiontexture;
  53 rtexture_t      *explosiontexturefog;
  54
  55 cvar_t r_explosionclip = {"r_explosionclip", "0"};
  56
  57 int R_ExplosionVert(int column, int row)
  58 {
  59         int i;
  60         float a, b, c;
  61         i = row * (EXPLOSIONGRID + 1) + column;
  62         a = row * M_PI * 2 / EXPLOSIONGRID;
  63         b = column * M_PI * 2 / EXPLOSIONGRID;
  64         c = cos(b);
  65         explosionpoint[i][0] = cos(a) * c;
  66         explosionpoint[i][1] = sin(a) * c;
  67         explosionpoint[i][2] = -sin(b);
  68         explosionnoiseindex[i] = (row & (EXPLOSIONGRID - 1)) * EXPLOSIONGRID + (column & (EXPLOSIONGRID - 1));
  69         explosiontexcoords[i][0] = (float) column / (float) EXPLOSIONGRID;
  70         explosiontexcoords[i][1] = (float) row / (float) EXPLOSIONGRID;
  71         return i;
  72 }
  73
  74 void r_explosion_start()
  75 {
  76         int x, y;
  77         byte noise1[128][128], noise2[128][128], data[128][128][4];
  78         fractalnoise(&noise1[0][0], 128, 2);
  79         fractalnoise(&noise2[0][0], 128, 2);
  80         for (y = 0;y < 128;y++)
  81         {
  82                 for (x = 0;x < 128;x++)
  83                 {
  84                         int j, r, g, b, a;
  85                         j = noise1[y][x] * 3 - 128;
  86                         r = (j * 512) / 256;
  87                         g = (j * 256) / 256;
  88                         b = (j * 128) / 256;
  89                         a = noise2[y][x];
  90                         data[y][x][0] = bound(0, r, 255);
  91                         data[y][x][1] = bound(0, g, 255);
  92                         data[y][x][2] = bound(0, b, 255);
  93                         data[y][x][3] = bound(0, a, 255);
  94                 }
  95         }
  96         explosiontexture = R_LoadTexture ("explosiontexture", 128, 128, &data[0][0][0], TEXF_MIPMAP | TEXF_ALPHA | TEXF_RGBA | TEXF_PRECACHE);
  97         for (y = 0;y < 128;y++)
  98                 for (x = 0;x < 128;x++)
  99                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 100         explosiontexturefog = R_LoadTexture ("explosiontexturefog", 128, 128, &data[0][0][0], TEXF_MIPMAP | TEXF_ALPHA | TEXF_RGBA | TEXF_PRECACHE);
 101 }
 102
 103 void r_explosion_shutdown()
 104 {
 105 }
 106
 107 void R_Explosion_Init()
 108 {
 109         int i, x, y;
 110         i = 0;
 111         for (y = 0;y < EXPLOSIONGRID;y++)
 112         {
 113                 for (x = 0;x < EXPLOSIONGRID;x++)
 114                 {
 115                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 116                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 117                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 118                         i++;
 119                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 120                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 121                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 122                         i++;
 123                 }
 124         }
 125         for (i = 0;i < EXPLOSIONVERTS;i++)
 126         {
 127                 explosionspherevert[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTRADIUS;
 128                 explosionspherevert[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTRADIUS;
 129                 explosionspherevert[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTRADIUS;
 130                 explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
 131                 explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
 132                 explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
 133         }
 134
 135         Cvar_RegisterVariable(&r_explosionclip);
 136
 137         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown);
 138 }
 139
 140 void R_NewExplosion(vec3_t org)
 141 {
 142         int i, j;
 143         float dist;
 144         byte noise[EXPLOSIONGRID*EXPLOSIONGRID];
 145         fractalnoise(noise, EXPLOSIONGRID, 2);
 146         for (i = 0;i < MAX_EXPLOSIONS;i++)
 147         {
 148                 if (explosion[i].alpha <= 0.0f)
 149                 {
 150                         explosion[i].alpha = EXPLOSIONFADESTART;
 151                         for (j = 0;j < EXPLOSIONVERTS;j++)
 152                         {
 153                                 dist = noise[explosionnoiseindex[j]] * (1.0f / 512.0f) + 0.5;
 154                                 explosion[i].vert[j][0] = explosionspherevert[j][0] * dist + org[0];
 155                                 explosion[i].vert[j][1] = explosionspherevert[j][1] * dist + org[1];
 156                                 explosion[i].vert[j][2] = explosionspherevert[j][2] * dist + org[2];
 157                                 explosion[i].vertvel[j][0] = explosionspherevertvel[j][0] * dist;
 158                                 explosion[i].vertvel[j][1] = explosionspherevertvel[j][1] * dist;
 159                                 explosion[i].vertvel[j][2] = explosionspherevertvel[j][2] * dist;
 160                         }
 161                         break;
 162                 }
 163         }
 164 }
 165
 166 void R_DrawExplosion(explosion_t *e)
 167 {
 168         int i, index, *indexlist = &explosiontris[0][0], alpha = bound(0, e->alpha * 128.0f, 128), texnum, fogtexnum;
 169         float s, t;
 170 //      s = cl.time * 1;
 171 //      t = cl.time * 0.75;
 172 //      s -= (int) s;
 173 //      t -= (int) t;
 174         s = 0;
 175         t = 0;
 176         /*
 177         glColor4f(1,1,1,e->alpha);
 178         glDisable(GL_TEXTURE_2D);
 179 //      glBindTexture(GL_TEXTURE_2D, explosiontexture);
 180         glVertexPointer(3, GL_FLOAT, 0, (float *) &e->vert[0][0]);
 181 //      glTexCoordPointer(2, GL_FLOAT, 0, (float *) &explosiontexcoords[0][0]);
 182         glEnableClientState(GL_VERTEX_ARRAY);
 183 //      glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 184         glDrawElements(GL_TRIANGLES, EXPLOSIONTRIS, GL_UNSIGNED_INT, indexlist);
 185 //      glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 186         glDisableClientState(GL_VERTEX_ARRAY);
 187         glEnable(GL_TEXTURE_2D);
 188         */
 189         texnum = R_GetTexture(explosiontexture);
 190         fogtexnum = R_GetTexture(explosiontexturefog);
 191         for (i = 0;i < EXPLOSIONTRIS;i++)
 192         {
 193                 transpolybegin(texnum, 0, fogtexnum, TPOLYTYPE_ALPHA);
 194                 index = *indexlist++;transpolyvert(e->vert[index][0], e->vert[index][1], e->vert[index][2], explosiontexcoords[index][0] + s, explosiontexcoords[index][1] + t, 255, 255, 255, alpha);
 195                 index = *indexlist++;transpolyvert(e->vert[index][0], e->vert[index][1], e->vert[index][2], explosiontexcoords[index][0] + s, explosiontexcoords[index][1] + t, 255, 255, 255, alpha);
 196                 index = *indexlist++;transpolyvert(e->vert[index][0], e->vert[index][1], e->vert[index][2], explosiontexcoords[index][0] + s, explosiontexcoords[index][1] + t, 255, 255, 255, alpha);
 197                 transpolyend();
 198         }
 199 }
 200
 201 void R_MoveExplosion(explosion_t *e, float frametime)
 202 {
 203         int i;
 204         vec3_t end;
 205         e->alpha -= frametime * EXPLOSIONFADERATE;
 206         for (i = 0;i < EXPLOSIONVERTS;i++)
 207         {
 208                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 209                 {
 210                         end[0] = e->vert[i][0] + frametime * e->vertvel[i][0];
 211                         end[1] = e->vert[i][1] + frametime * e->vertvel[i][1];
 212                         end[2] = e->vert[i][2] + frametime * e->vertvel[i][2];
 213                         if (r_explosionclip.value)
 214                         {
 215                                 float f, dot;
 216                                 vec3_t impact, normal;
 217                                 f = TraceLine(e->vert[i], end, impact, normal);
 218                                 VectorCopy(impact, e->vert[i]);
 219                                 if (f < 1)
 220                                 {
 221                                         // clip velocity against the wall
 222                                         dot = -DotProduct(e->vertvel[i], normal);
 223                                         e->vertvel[i][0] += normal[0] * dot;
 224                                         e->vertvel[i][1] += normal[1] * dot;
 225                                         e->vertvel[i][2] += normal[2] * dot;
 226                                 }
 227                         }
 228                         else
 229                         {
 230                                 VectorCopy(end, e->vert[i]);
 231                         }
 232                 }
 233         }
 234 }
 235
 236 void R_MoveExplosions()
 237 {
 238         int i;
 239         float frametime;
 240         frametime = cl.time - cl.oldtime;
 241         for (i = 0;i < MAX_EXPLOSIONS;i++)
 242         {
 243                 if (explosion[i].alpha > 0.0f)
 244                 {
 245                         if (explosion[i].starttime > cl.time)
 246                         {
 247                                 explosion[i].alpha = 0;
 248                                 continue;
 249                         }
 250                         R_MoveExplosion(&explosion[i], frametime);
 251                 }
 252         }
 253 }
 254
 255 void R_DrawExplosions()
 256 {
 257         int i;
 258         for (i = 0;i < MAX_EXPLOSIONS;i++)
 259         {
 260                 if (explosion[i].alpha > 0.0f)
 261                 {
 262                         R_DrawExplosion(&explosion[i]);
 263                 }
 264         }
 265 }