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", true};
  56 cvar_t r_drawexplosions = {"r_drawexplosions", "1"};
  57
  58 int R_ExplosionVert(int column, int row)
  59 {
  60         int i;
  61         float a, b, c;
  62         i = row * (EXPLOSIONGRID + 1) + column;
  63         a = row * M_PI * 2 / EXPLOSIONGRID;
  64         b = column * M_PI * 2 / EXPLOSIONGRID;
  65         c = cos(b);
  66         explosionpoint[i][0] = cos(a) * c;
  67         explosionpoint[i][1] = sin(a) * c;
  68         explosionpoint[i][2] = -sin(b);
  69         explosionnoiseindex[i] = (row & (EXPLOSIONGRID - 1)) * EXPLOSIONGRID + (column & (EXPLOSIONGRID - 1));
  70         explosiontexcoords[i][0] = (float) column / (float) EXPLOSIONGRID;
  71         explosiontexcoords[i][1] = (float) row / (float) EXPLOSIONGRID;
  72         return i;
  73 }
  74
  75 void r_explosion_start(void)
  76 {
  77         int x, y;
  78         byte noise1[128][128], noise2[128][128], data[128][128][4];
  79         fractalnoise(&noise1[0][0], 128, 2);
  80         fractalnoise(&noise2[0][0], 128, 2);
  81         for (y = 0;y < 128;y++)
  82         {
  83                 for (x = 0;x < 128;x++)
  84                 {
  85                         int j, r, g, b, a;
  86                         j = noise1[y][x] * 3 - 128;
  87                         r = (j * 512) / 256;
  88                         g = (j * 256) / 256;
  89                         b = (j * 128) / 256;
  90                         a = noise2[y][x];
  91                         data[y][x][0] = bound(0, r, 255);
  92                         data[y][x][1] = bound(0, g, 255);
  93                         data[y][x][2] = bound(0, b, 255);
  94                         data[y][x][3] = bound(0, a, 255);
  95                 }
  96         }
  97         explosiontexture = R_LoadTexture ("explosiontexture", 128, 128, &data[0][0][0], TEXF_MIPMAP | TEXF_ALPHA | TEXF_RGBA | TEXF_PRECACHE);
  98         for (y = 0;y < 128;y++)
  99                 for (x = 0;x < 128;x++)
 100                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
 101         explosiontexturefog = R_LoadTexture ("explosiontexturefog", 128, 128, &data[0][0][0], TEXF_MIPMAP | TEXF_ALPHA | TEXF_RGBA | TEXF_PRECACHE);
 102 }
 103
 104 void r_explosion_shutdown(void)
 105 {
 106 }
 107
 108 void r_explosion_newmap(void)
 109 {
 110         memset(explosion, 0, sizeof(explosion));
 111 }
 112
 113 void R_Explosion_Init(void)
 114 {
 115         int i, x, y;
 116         i = 0;
 117         for (y = 0;y < EXPLOSIONGRID;y++)
 118         {
 119                 for (x = 0;x < EXPLOSIONGRID;x++)
 120                 {
 121                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 122                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 123                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 124                         i++;
 125                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 126                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 127                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 128                         i++;
 129                 }
 130         }
 131         for (i = 0;i < EXPLOSIONVERTS;i++)
 132         {
 133                 explosionspherevert[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTRADIUS;
 134                 explosionspherevert[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTRADIUS;
 135                 explosionspherevert[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTRADIUS;
 136                 explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
 137                 explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
 138                 explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
 139         }
 140
 141         Cvar_RegisterVariable(&r_explosionclip);
 142         Cvar_RegisterVariable(&r_drawexplosions);
 143
 144         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
 145 }
 146
 147 void R_NewExplosion(vec3_t org)
 148 {
 149         int i, j;
 150         float dist;
 151         byte noise[EXPLOSIONGRID*EXPLOSIONGRID];
 152         fractalnoise(noise, EXPLOSIONGRID, 2);
 153         for (i = 0;i < MAX_EXPLOSIONS;i++)
 154         {
 155                 if (explosion[i].alpha <= 0.0f)
 156                 {
 157                         explosion[i].alpha = EXPLOSIONFADESTART;
 158                         for (j = 0;j < EXPLOSIONVERTS;j++)
 159                         {
 160                                 dist = noise[explosionnoiseindex[j]] * (1.0f / 512.0f) + 0.5;
 161                                 explosion[i].vert[j][0] = explosionspherevert[j][0] * dist + org[0];
 162                                 explosion[i].vert[j][1] = explosionspherevert[j][1] * dist + org[1];
 163                                 explosion[i].vert[j][2] = explosionspherevert[j][2] * dist + org[2];
 164                                 explosion[i].vertvel[j][0] = explosionspherevertvel[j][0] * dist;
 165                                 explosion[i].vertvel[j][1] = explosionspherevertvel[j][1] * dist;
 166                                 explosion[i].vertvel[j][2] = explosionspherevertvel[j][2] * dist;
 167                         }
 168                         break;
 169                 }
 170         }
 171 }
 172
 173 void R_DrawExplosion(explosion_t *e)
 174 {
 175         int i, index, *indexlist = &explosiontris[0][0], alpha = bound(0, e->alpha * 128.0f, 128), texnum, fogtexnum;
 176         float s, t;
 177 //      s = cl.time * 1;
 178 //      t = cl.time * 0.75;
 179 //      s -= (int) s;
 180 //      t -= (int) t;
 181         s = 0;
 182         t = 0;
 183         /*
 184         glColor4f(1,1,1,e->alpha);
 185         glDisable(GL_TEXTURE_2D);
 186 //      glBindTexture(GL_TEXTURE_2D, explosiontexture);
 187         glVertexPointer(3, GL_FLOAT, sizeof(float[3]), (float *) &e->vert[0][0]);
 188 //      glTexCoordPointer(2, GL_FLOAT, sizeof(float[2]), (float *) &explosiontexcoords[0][0]);
 189         glEnableClientState(GL_VERTEX_ARRAY);
 190 //      glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 191         glDrawElements(GL_TRIANGLES, EXPLOSIONTRIS, GL_UNSIGNED_INT, indexlist);
 192 //      glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 193         glDisableClientState(GL_VERTEX_ARRAY);
 194         glEnable(GL_TEXTURE_2D);
 195         */
 196         texnum = R_GetTexture(explosiontexture);
 197         fogtexnum = R_GetTexture(explosiontexturefog);
 198         for (i = 0;i < EXPLOSIONTRIS;i++)
 199         {
 200                 transpolybegin(texnum, 0, fogtexnum, TPOLYTYPE_ALPHA);
 201                 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);
 202                 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);
 203                 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);
 204                 transpolyend();
 205         }
 206 }
 207
 208 void R_MoveExplosion(explosion_t *e, float frametime)
 209 {
 210         int i;
 211         vec3_t end;
 212         e->alpha -= frametime * EXPLOSIONFADERATE;
 213         for (i = 0;i < EXPLOSIONVERTS;i++)
 214         {
 215                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 216                 {
 217                         end[0] = e->vert[i][0] + frametime * e->vertvel[i][0];
 218                         end[1] = e->vert[i][1] + frametime * e->vertvel[i][1];
 219                         end[2] = e->vert[i][2] + frametime * e->vertvel[i][2];
 220                         if (r_explosionclip.value)
 221                         {
 222                                 float f, dot;
 223                                 vec3_t impact, normal;
 224                                 f = TraceLine(e->vert[i], end, impact, normal);
 225                                 VectorCopy(impact, e->vert[i]);
 226                                 if (f < 1)
 227                                 {
 228                                         // clip velocity against the wall
 229                                         dot = -DotProduct(e->vertvel[i], normal);
 230                                         e->vertvel[i][0] += normal[0] * dot;
 231                                         e->vertvel[i][1] += normal[1] * dot;
 232                                         e->vertvel[i][2] += normal[2] * dot;
 233                                 }
 234                         }
 235                         else
 236                         {
 237                                 VectorCopy(end, e->vert[i]);
 238                         }
 239                 }
 240         }
 241 }
 242
 243 void R_MoveExplosions(void)
 244 {
 245         int i;
 246         float frametime;
 247         frametime = cl.time - cl.oldtime;
 248         for (i = 0;i < MAX_EXPLOSIONS;i++)
 249         {
 250                 if (explosion[i].alpha > 0.0f)
 251                 {
 252                         if (explosion[i].starttime > cl.time)
 253                         {
 254                                 explosion[i].alpha = 0;
 255                                 continue;
 256                         }
 257                         R_MoveExplosion(&explosion[i], frametime);
 258                 }
 259         }
 260 }
 261
 262 void R_DrawExplosions(void)
 263 {
 264         int i;
 265         if (!r_drawexplosions.value)
 266                 return;
 267         for (i = 0;i < MAX_EXPLOSIONS;i++)
 268         {
 269                 if (explosion[i].alpha > 0.0f)
 270                 {
 271                         R_DrawExplosion(&explosion[i]);
 272                 }
 273         }
 274 }