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 #ifdef MAX_EXPLOSIONS
  25 #define EXPLOSIONGRID 8
  26 #define EXPLOSIONVERTS ((EXPLOSIONGRID+1)*(EXPLOSIONGRID+1))
  27 #define EXPLOSIONTRIS (EXPLOSIONGRID*EXPLOSIONGRID*2)
  28
  29 static int numexplosions = 0;
  30
  31 static float explosiontexcoord2f[EXPLOSIONVERTS][2];
  32 static unsigned short explosiontris[EXPLOSIONTRIS][3];
  33 static int explosionnoiseindex[EXPLOSIONVERTS];
  34 static vec3_t explosionpoint[EXPLOSIONVERTS];
  35
  36 typedef struct explosion_s
  37 {
  38         float starttime;
  39         float endtime;
  40         float time;
  41         float alpha;
  42         float fade;
  43         vec3_t origin;
  44         vec3_t vert[EXPLOSIONVERTS];
  45         vec3_t vertvel[EXPLOSIONVERTS];
  46         qboolean clipping;
  47 }
  48 explosion_t;
  49
  50 static explosion_t explosion[MAX_EXPLOSIONS];
  51
  52 static rtexture_t       *explosiontexture;
  53 static rtexture_t       *explosiontexturefog;
  54
  55 static rtexturepool_t   *explosiontexturepool;
  56 #endif
  57
  58 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1", "enables collision detection for explosion shell (so that it flattens against walls and floors)"};
  59 #ifdef MAX_EXPLOSIONS
  60 static cvar_t r_drawexplosions = {0, "r_drawexplosions", "1", "enables rendering of explosion shells (see also cl_particles_explosions_shell)"};
  61
  62 static void r_explosion_start(void)
  63 {
  64         int x, y;
  65         unsigned char noise1[128][128], noise2[128][128], noise3[128][128], data[128][128][4];
  66         explosiontexturepool = R_AllocTexturePool();
  67         fractalnoise(&noise1[0][0], 128, 32);
  68         fractalnoise(&noise2[0][0], 128, 4);
  69         fractalnoise(&noise3[0][0], 128, 4);
  70         for (y = 0;y < 128;y++)
  71         {
  72                 for (x = 0;x < 128;x++)
  73                 {
  74                         int j, r, g, b, a;
  75                         j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
  76                         r = (j * 512) / 256;
  77                         g = (j * 256) / 256;
  78                         b = (j * 128) / 256;
  79                         a = noise3[y][x] * 3 - 128;
  80                         data[y][x][2] = bound(0, r, 255);
  81                         data[y][x][1] = bound(0, g, 255);
  82                         data[y][x][0] = bound(0, b, 255);
  83                         data[y][x][3] = bound(0, a, 255);
  84                 }
  85         }
  86         explosiontexture = R_LoadTexture2D(explosiontexturepool, "explosiontexture", 128, 128, &data[0][0][0], TEXTYPE_BGRA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE | TEXF_FORCELINEAR, NULL);
  87         for (y = 0;y < 128;y++)
  88                 for (x = 0;x < 128;x++)
  89                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
  90         explosiontexturefog = R_LoadTexture2D(explosiontexturepool, "explosiontexturefog", 128, 128, &data[0][0][0], TEXTYPE_BGRA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE | TEXF_FORCELINEAR, NULL);
  91         // note that explosions survive the restart
  92 }
  93
  94 static void r_explosion_shutdown(void)
  95 {
  96         R_FreeTexturePool(&explosiontexturepool);
  97 }
  98
  99 static void r_explosion_newmap(void)
 100 {
 101         numexplosions = 0;
 102         memset(explosion, 0, sizeof(explosion));
 103 }
 104
 105 static int R_ExplosionVert(int column, int row)
 106 {
 107         int i;
 108         float yaw, pitch;
 109         // top and bottom rows are all one position...
 110         if (row == 0 || row == EXPLOSIONGRID)
 111                 column = 0;
 112         i = row * (EXPLOSIONGRID + 1) + column;
 113         yaw = ((double) column / EXPLOSIONGRID) * M_PI * 2;
 114         pitch = (((double) row / EXPLOSIONGRID) - 0.5) * M_PI;
 115         explosionpoint[i][0] = cos(yaw) *  cos(pitch);
 116         explosionpoint[i][1] = sin(yaw) *  cos(pitch);
 117         explosionpoint[i][2] =        1 * -sin(pitch);
 118         explosiontexcoord2f[i][0] = (float) column / (float) EXPLOSIONGRID;
 119         explosiontexcoord2f[i][1] = (float) row / (float) EXPLOSIONGRID;
 120         explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
 121         return i;
 122 }
 123 #endif
 124
 125 void R_Explosion_Init(void)
 126 {
 127 #ifdef MAX_EXPLOSIONS
 128         int i, x, y;
 129         i = 0;
 130         for (y = 0;y < EXPLOSIONGRID;y++)
 131         {
 132                 for (x = 0;x < EXPLOSIONGRID;x++)
 133                 {
 134                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 135                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 136                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 137                         i++;
 138                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 139                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 140                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 141                         i++;
 142                 }
 143         }
 144
 145 #endif
 146         Cvar_RegisterVariable(&r_explosionclip);
 147 #ifdef MAX_EXPLOSIONS
 148         Cvar_RegisterVariable(&r_drawexplosions);
 149
 150         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
 151 #endif
 152 }
 153
 154 void R_NewExplosion(const vec3_t org)
 155 {
 156 #ifdef MAX_EXPLOSIONS
 157         int i, j;
 158         float dist, n;
 159         explosion_t *e;
 160         trace_t trace;
 161         unsigned char noise[EXPLOSIONGRID*EXPLOSIONGRID];
 162         fractalnoisequick(noise, EXPLOSIONGRID, 4); // adjust noise grid size according to explosion
 163         for (i = 0, e = explosion;i < MAX_EXPLOSIONS;i++, e++)
 164         {
 165                 if (!e->alpha)
 166                 {
 167                         numexplosions = max(numexplosions, i + 1);
 168                         e->starttime = cl.time;
 169                         e->endtime = cl.time + cl_explosions_lifetime.value;
 170                         e->time = e->starttime;
 171                         e->alpha = cl_explosions_alpha_start.value;
 172                         e->fade = (cl_explosions_alpha_start.value - cl_explosions_alpha_end.value) / cl_explosions_lifetime.value;
 173                         e->clipping = r_explosionclip.integer != 0;
 174                         VectorCopy(org, e->origin);
 175                         for (j = 0;j < EXPLOSIONVERTS;j++)
 176                         {
 177                                 // calculate start origin and velocity
 178                                 n = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
 179                                 dist = n * cl_explosions_size_start.value;
 180                                 VectorMA(e->origin, dist, explosionpoint[j], e->vert[j]);
 181                                 dist = n * (cl_explosions_size_end.value - cl_explosions_size_start.value) / cl_explosions_lifetime.value;
 182                                 VectorScale(explosionpoint[j], dist, e->vertvel[j]);
 183                                 // clip start origin
 184                                 if (e->clipping)
 185                                 {
 186                                         trace = CL_TraceLine(e->origin, e->vert[j], MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
 187                                         VectorCopy(trace.endpos, e->vert[i]);
 188                                 }
 189                         }
 190                         break;
 191                 }
 192         }
 193 #endif
 194 }
 195
 196 #ifdef MAX_EXPLOSIONS
 197 static void R_DrawExplosion_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
 198 {
 199         int surfacelistindex = 0;
 200         const int numtriangles = EXPLOSIONTRIS, numverts = EXPLOSIONVERTS;
 201         rmeshstate_t m;
 202         GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
 203         GL_DepthMask(false);
 204         GL_DepthRange(0, 1);
 205         GL_PolygonOffset(r_refdef.polygonfactor, r_refdef.polygonoffset);
 206         GL_DepthTest(true);
 207         GL_CullFace(r_refdef.view.cullface_back);
 208         R_Mesh_Matrix(&identitymatrix);
 209
 210         R_SetupGenericShader(true);
 211         R_Mesh_ColorPointer(NULL, 0, 0);
 212         memset(&m, 0, sizeof(m));
 213         m.tex[0] = R_GetTexture(explosiontexture);
 214         m.pointer_texcoord[0] = explosiontexcoord2f[0];
 215         R_Mesh_TextureState(&m);
 216         for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
 217         {
 218                 const explosion_t *e = explosion + surfacelist[surfacelistindex];
 219                 R_Mesh_VertexPointer(e->vert[0], 0, 0);
 220                 // FIXME: fixed function path can't properly handle r_refdef.view.colorscale > 1
 221                 GL_Color(e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, 1);
 222                 GL_LockArrays(0, numverts);
 223                 R_Mesh_Draw(0, numverts, 0, numtriangles, NULL, explosiontris[0], 0, 0);
 224                 GL_LockArrays(0, 0);
 225         }
 226 }
 227
 228 static void R_MoveExplosion(explosion_t *e)
 229 {
 230         int i;
 231         float dot, end[3], frametime;
 232         trace_t trace;
 233
 234         frametime = cl.time - e->time;
 235         e->time = cl.time;
 236         e->alpha = e->alpha - (e->fade * frametime);
 237         if (e->alpha < 0 || cl.time > e->endtime)
 238         {
 239                 e->alpha = 0;
 240                 return;
 241         }
 242         for (i = 0;i < EXPLOSIONVERTS;i++)
 243         {
 244                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 245                 {
 246                         VectorMA(e->vert[i], frametime, e->vertvel[i], end);
 247                         if (e->clipping)
 248                         {
 249                                 trace = CL_TraceLine(e->vert[i], end, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
 250                                 if (trace.fraction < 1)
 251                                 {
 252                                         // clip velocity against the wall
 253                                         dot = -DotProduct(e->vertvel[i], trace.plane.normal);
 254                                         VectorMA(e->vertvel[i], dot, trace.plane.normal, e->vertvel[i]);
 255                                 }
 256                                 VectorCopy(trace.endpos, e->vert[i]);
 257                         }
 258                         else
 259                                 VectorCopy(end, e->vert[i]);
 260                 }
 261         }
 262 }
 263 #endif
 264
 265 void R_DrawExplosions(void)
 266 {
 267 #ifdef MAX_EXPLOSIONS
 268         int i;
 269
 270         if (!r_drawexplosions.integer)
 271                 return;
 272
 273         for (i = 0;i < numexplosions;i++)
 274         {
 275                 if (explosion[i].alpha)
 276                 {
 277                         R_MoveExplosion(&explosion[i]);
 278                         if (explosion[i].alpha)
 279                                 R_MeshQueue_AddTransparent(explosion[i].origin, R_DrawExplosion_TransparentCallback, NULL, i, NULL);
 280                 }
 281         }
 282         while (numexplosions > 0 && explosion[i-1].alpha <= 0)
 283                 numexplosions--;
 284 #endif
 285 }
 286