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 EXPLOSIONBANDS 16
  27 #define EXPLOSIONSEGMENTS 16
  28 #define EXPLOSIONVERTS ((EXPLOSIONBANDS+1)*(EXPLOSIONSEGMENTS+1))
  29 #define EXPLOSIONTRIS (EXPLOSIONVERTS*2)
  30 #define EXPLOSIONSTARTRADIUS (0.0f)
  31 #define EXPLOSIONSTARTVELOCITY (400.0f)
  32 #define EXPLOSIONFADESTART (1.5f)
  33 #define EXPLOSIONFADERATE (6.0f)
  34
  35 vec3_t explosionspherevert[EXPLOSIONVERTS];
  36 vec3_t explosionspherevertvel[EXPLOSIONVERTS];
  37 float explosiontexcoords[EXPLOSIONVERTS][2];
  38 int explosiontris[EXPLOSIONTRIS][3];
  39 vec3_t explosionpoint[EXPLOSIONVERTS];
  40
  41 typedef struct explosion_s
  42 {
  43         float alpha;
  44         vec3_t vert[EXPLOSIONVERTS];
  45         vec3_t vertvel[EXPLOSIONVERTS];
  46 }
  47 explosion_t;
  48
  49 explosion_t explosion[128];
  50
  51 int             explosiontexture;
  52 int             explosiontexturefog;
  53
  54 cvar_t r_explosionclip = {"r_explosionclip", "0"};
  55
  56 int R_ExplosionVert(int column, int row)
  57 {
  58         int i;
  59         float a, b, c;
  60         i = row * (EXPLOSIONSEGMENTS + 1) + column;
  61         a = row * M_PI * 2 / EXPLOSIONBANDS;
  62         b = column * M_PI * 2 / EXPLOSIONSEGMENTS;
  63         c = cos(b);
  64         explosionpoint[i][0] = cos(a) * c;
  65         explosionpoint[i][1] = sin(a) * c;
  66         explosionpoint[i][2] = -sin(b);
  67         explosiontexcoords[i][0] = (float) column / (float) EXPLOSIONSEGMENTS;
  68         explosiontexcoords[i][1] = (float) row / (float) EXPLOSIONBANDS;
  69         return i;
  70 }
  71
  72 void r_explosion_start()
  73 {
  74         int x, y;
  75         byte noise1[128][128], noise2[128][128], data[128][128][4];
  76         fractalnoise(&noise1[0][0], 128, 8);
  77         fractalnoise(&noise2[0][0], 128, 8);
  78         for (y = 0;y < 128;y++)
  79         {
  80                 for (x = 0;x < 128;x++)
  81                 {
  82                         int j, r, g, b, a;
  83                         j = noise1[y][x] * 3 - 128;
  84                         r = (j * 512) / 256;
  85                         g = (j * 256) / 256;
  86                         b = (j * 128) / 256;
  87                         a = noise2[y][x];
  88                         data[y][x][0] = bound(0, r, 255);
  89                         data[y][x][1] = bound(0, g, 255);
  90                         data[y][x][2] = bound(0, b, 255);
  91                         data[y][x][3] = bound(0, a, 255);
  92                 }
  93         }
  94         explosiontexture = GL_LoadTexture ("explosiontexture", 128, 128, &data[0][0][0], true, true, 4);
  95         for (y = 0;y < 128;y++)
  96                 for (x = 0;x < 128;x++)
  97                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
  98         explosiontexturefog = GL_LoadTexture ("explosiontexturefog", 128, 128, &data[0][0][0], true, true, 4);
  99 }
 100
 101 void r_explosion_shutdown()
 102 {
 103 }
 104
 105 void R_Explosion_Init()
 106 {
 107         int i, x, y;
 108         i = 0;
 109         for (y = 0;y < EXPLOSIONBANDS;y++)
 110         {
 111                 for (x = 0;x < EXPLOSIONSEGMENTS;x++)
 112                 {
 113                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 114                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 115                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 116                         i++;
 117                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 118                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 119                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 120                         i++;
 121                 }
 122         }
 123         for (i = 0;i < EXPLOSIONVERTS;i++)
 124         {
 125                 explosionspherevert[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTRADIUS;
 126                 explosionspherevert[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTRADIUS;
 127                 explosionspherevert[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTRADIUS;
 128                 explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
 129                 explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
 130                 explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
 131         }
 132
 133         Cvar_RegisterVariable(&r_explosionclip);
 134
 135         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown);
 136 }
 137
 138 void R_NewExplosion(vec3_t org)
 139 {
 140         int i, j;
 141         for (i = 0;i < MAX_EXPLOSIONS;i++)
 142         {
 143                 if (explosion[i].alpha <= 0.0f)
 144                 {
 145                         explosion[i].alpha = EXPLOSIONFADESTART;
 146                         for (j = 0;j < EXPLOSIONVERTS;j++)
 147                         {
 148                                 explosion[i].vert[j][0] = explosionspherevert[j][0] + org[0];
 149                                 explosion[i].vert[j][1] = explosionspherevert[j][1] + org[1];
 150                                 explosion[i].vert[j][2] = explosionspherevert[j][2] + org[2];
 151                                 explosion[i].vertvel[j][0] = explosionspherevertvel[j][0];
 152                                 explosion[i].vertvel[j][1] = explosionspherevertvel[j][1];
 153                                 explosion[i].vertvel[j][2] = explosionspherevertvel[j][2];
 154                         }
 155                         break;
 156                 }
 157         }
 158 }
 159
 160 void R_DrawExplosion(explosion_t *e)
 161 {
 162         int i, index, *indexlist = &explosiontris[0][0], alpha = bound(0, e->alpha * 255.0f, 255);
 163         float s = cl.time * 1, t = cl.time * 0.75;
 164         s -= (int) s;
 165         t -= (int) t;
 166         /*
 167         glColor4f(1,1,1,e->alpha);
 168         glDisable(GL_TEXTURE_2D);
 169 //      glBindTexture(GL_TEXTURE_2D, explosiontexture);
 170         if (gl_vertexarrays.value)
 171         {
 172                 qglVertexPointer(3, GL_FLOAT, 0, (float *) &e->vert[0][0]);
 173 //              qglTexCoordPointer(2, GL_FLOAT, 0, (float *) &explosiontexcoords[0][0]);
 174                 glEnableClientState(GL_VERTEX_ARRAY);
 175 //              glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 176                 qglDrawElements(GL_TRIANGLES, EXPLOSIONTRIS, GL_UNSIGNED_INT, indexlist);
 177 //              glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 178                 glDisableClientState(GL_VERTEX_ARRAY);
 179         }
 180         else
 181         {
 182                 glBegin(GL_TRIANGLES);
 183                 for (i = 0;i < EXPLOSIONTRIS * 3;i++)
 184                 {
 185                         index = *indexlist++;
 186 //                      glTexCoord2fv(explosiontexcoords[index]);
 187                         glVertex3fv(e->vert[index]);
 188                 }
 189                 glEnd();
 190         }
 191         glEnable(GL_TEXTURE_2D);
 192         */
 193         for (i = 0;i < EXPLOSIONTRIS;i++)
 194         {
 195                 transpolybegin(explosiontexture, 0, explosiontexturefog, TPOLYTYPE_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                 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);
 198                 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);
 199                 transpolyend();
 200         }
 201 }
 202
 203 void R_MoveExplosion(explosion_t *e, float frametime)
 204 {
 205         int i;
 206         vec3_t end;
 207         e->alpha -= frametime * EXPLOSIONFADERATE;
 208         for (i = 0;i < EXPLOSIONVERTS;i++)
 209         {
 210                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 211                 {
 212                         end[0] = e->vert[i][0] + frametime * e->vertvel[i][0];
 213                         end[1] = e->vert[i][1] + frametime * e->vertvel[i][1];
 214                         end[2] = e->vert[i][2] + frametime * e->vertvel[i][2];
 215                         if (r_explosionclip.value)
 216                         {
 217                                 float f, dot;
 218                                 vec3_t impact, normal;
 219                                 f = TraceLine(e->vert[i], end, impact, normal);
 220                                 VectorCopy(impact, e->vert[i]);
 221                                 if (f < 1)
 222                                 {
 223                                         // clip velocity against the wall
 224                                         dot = -DotProduct(e->vertvel[i], normal);
 225                                         e->vertvel[i][0] += normal[0] * dot;
 226                                         e->vertvel[i][1] += normal[1] * dot;
 227                                         e->vertvel[i][2] += normal[2] * dot;
 228                                 }
 229                         }
 230                         else
 231                         {
 232                                 VectorCopy(end, e->vert[i]);
 233                         }
 234                 }
 235         }
 236 }
 237
 238 void R_MoveExplosions()
 239 {
 240         int i;
 241         float frametime;
 242         frametime = cl.time - cl.oldtime;
 243         for (i = 0;i < MAX_EXPLOSIONS;i++)
 244         {
 245                 if (explosion[i].alpha > 0.0f)
 246                 {
 247                         R_MoveExplosion(&explosion[i], frametime);
 248                 }
 249         }
 250 }
 251
 252 void R_DrawExplosions()
 253 {
 254         int i;
 255         for (i = 0;i < MAX_EXPLOSIONS;i++)
 256         {
 257                 if (explosion[i].alpha > 0.0f)
 258                 {
 259                         R_DrawExplosion(&explosion[i]);
 260                 }
 261         }
 262 }