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
  30 float explosiontexcoord2f[EXPLOSIONVERTS][2];
  31 int explosiontris[EXPLOSIONTRIS][3];
  32 int explosionnoiseindex[EXPLOSIONVERTS];
  33 vec3_t explosionpoint[EXPLOSIONVERTS];
  34 vec3_t explosionspherevertvel[EXPLOSIONVERTS];
  35
  36 typedef struct explosion_s
  37 {
  38         float starttime;
  39         float time;
  40         float alpha;
  41         float fade;
  42         vec3_t origin;
  43         vec3_t vert[EXPLOSIONVERTS];
  44         vec3_t vertvel[EXPLOSIONVERTS];
  45 }
  46 explosion_t;
  47
  48 explosion_t explosion[MAX_EXPLOSIONS];
  49
  50 rtexture_t      *explosiontexture;
  51 rtexture_t      *explosiontexturefog;
  52
  53 rtexturepool_t  *explosiontexturepool;
  54
  55 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1"};
  56 cvar_t r_drawexplosions = {0, "r_drawexplosions", "1"};
  57
  58 void r_explosion_start(void)
  59 {
  60         int x, y;
  61         qbyte 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 void r_explosion_shutdown(void)
  91 {
  92         R_FreeTexturePool(&explosiontexturepool);
  93 }
  94
  95 void r_explosion_newmap(void)
  96 {
  97         memset(explosion, 0, sizeof(explosion));
  98 }
  99
 100 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         explosionspherevertvel[i][0] = explosionpoint[i][0] * EXPLOSIONSTARTVELOCITY;
 114         explosionspherevertvel[i][1] = explosionpoint[i][1] * EXPLOSIONSTARTVELOCITY;
 115         explosionspherevertvel[i][2] = explosionpoint[i][2] * EXPLOSIONSTARTVELOCITY;
 116         explosiontexcoord2f[i][0] = (float) column / (float) EXPLOSIONGRID;
 117         explosiontexcoord2f[i][1] = (float) row / (float) EXPLOSIONGRID;
 118         explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
 119         return i;
 120 }
 121
 122 void R_Explosion_Init(void)
 123 {
 124         int i, x, y;
 125         i = 0;
 126         for (y = 0;y < EXPLOSIONGRID;y++)
 127         {
 128                 for (x = 0;x < EXPLOSIONGRID;x++)
 129                 {
 130                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 131                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 132                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 133                         i++;
 134                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 135                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 136                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 137                         i++;
 138                 }
 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         qbyte noise[EXPLOSIONGRID*EXPLOSIONGRID];
 152         fractalnoisequick(noise, EXPLOSIONGRID, 4); // adjust noise grid size according to explosion
 153         for (i = 0;i < MAX_EXPLOSIONS;i++)
 154         {
 155                 if (explosion[i].alpha <= cl_explosions_alpha_end.value)
 156                 {
 157                         explosion[i].starttime = cl.time;
 158                         explosion[i].time = explosion[i].starttime - 0.1;
 159                         explosion[i].alpha = cl_explosions_alpha_start.value;
 160                         explosion[i].fade = (cl_explosions_alpha_start.value - cl_explosions_alpha_end.value) / cl_explosions_lifetime.value;
 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
 192         memset(&m, 0, sizeof(m));
 193         m.tex[0] = R_GetTexture(explosiontexture);
 194         m.pointer_texcoord[0] = explosiontexcoord2f[0];
 195         m.pointer_vertex = e->vert[0];
 196         R_Mesh_State(&m);
 197
 198         GL_Color(alpha, alpha, alpha, 1);
 199
 200         GL_LockArrays(0, numverts);
 201         R_Mesh_Draw(numverts, numtriangles, explosiontris[0]);
 202         GL_LockArrays(0, 0);
 203 }
 204
 205 void R_MoveExplosion(explosion_t *e)
 206 {
 207         int i;
 208         float dot, frictionscale, end[3], impact[3], normal[3], frametime;
 209
 210         frametime = cl.time - e->time;
 211         e->time = cl.time;
 212         e->alpha = e->alpha - (e->fade * frametime);
 213         if (e->alpha <= cl_explosions_alpha_end.value)
 214         {
 215                 e->alpha = -1;
 216                 return;
 217         }
 218         frictionscale = 1 - frametime;
 219         frictionscale = bound(0, frictionscale, 1);
 220         for (i = 0;i < EXPLOSIONVERTS;i++)
 221         {
 222                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 223                 {
 224                         VectorScale(e->vertvel[i], frictionscale, e->vertvel[i]);
 225                         VectorMA(e->vert[i], frametime, e->vertvel[i], end);
 226                         if (r_explosionclip.integer)
 227                         {
 228                                 if (CL_TraceLine(e->vert[i], end, impact, normal, true, NULL, SUPERCONTENTS_SOLID) < 1)
 229                                 {
 230                                         // clip velocity against the wall
 231                                         dot = DotProduct(e->vertvel[i], normal) * -1.125f;
 232                                         VectorMA(e->vertvel[i], dot, normal, e->vertvel[i]);
 233                                 }
 234                                 VectorCopy(impact, e->vert[i]);
 235                         }
 236                         else
 237                                 VectorCopy(end, e->vert[i]);
 238                 }
 239         }
 240 }
 241
 242
 243 void R_MoveExplosions(void)
 244 {
 245         int i;
 246         float frametime;
 247
 248         frametime = cl.time - cl.oldtime;
 249
 250         for (i = 0;i < MAX_EXPLOSIONS;i++)
 251                 if (explosion[i].alpha > cl_explosions_alpha_end.value)
 252                         R_MoveExplosion(&explosion[i]);
 253 }
 254
 255 void R_DrawExplosions(void)
 256 {
 257         int i;
 258
 259         if (!r_drawexplosions.integer)
 260                 return;
 261         for (i = 0;i < MAX_EXPLOSIONS;i++)
 262                 if (explosion[i].alpha > cl_explosions_alpha_end.value)
 263                         R_MeshQueue_AddTransparent(explosion[i].origin, R_DrawExplosionCallback, &explosion[i], 0);
 264 }
 265