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
  29 static int numexplosions = 0;
  30
  31 static float explosiontexcoord2f[EXPLOSIONVERTS][2];
  32 static int 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
  57 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1", "enables collision detection for explosion shell (so that it flattens against walls and floors)"};
  58 static cvar_t r_drawexplosions = {0, "r_drawexplosions", "1", "enables rendering of explosion shells (see also cl_particles_explosions_shell)"};
  59
  60 static void r_explosion_start(void)
  61 {
  62         int x, y;
  63         unsigned char noise1[128][128], noise2[128][128], noise3[128][128], data[128][128][4];
  64         explosiontexturepool = R_AllocTexturePool();
  65         fractalnoise(&noise1[0][0], 128, 32);
  66         fractalnoise(&noise2[0][0], 128, 4);
  67         fractalnoise(&noise3[0][0], 128, 4);
  68         for (y = 0;y < 128;y++)
  69         {
  70                 for (x = 0;x < 128;x++)
  71                 {
  72                         int j, r, g, b, a;
  73                         j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
  74                         r = (j * 512) / 256;
  75                         g = (j * 256) / 256;
  76                         b = (j * 128) / 256;
  77                         a = noise3[y][x] * 3 - 128;
  78                         data[y][x][2] = bound(0, r, 255);
  79                         data[y][x][1] = bound(0, g, 255);
  80                         data[y][x][0] = bound(0, b, 255);
  81                         data[y][x][3] = bound(0, a, 255);
  82                 }
  83         }
  84         explosiontexture = R_LoadTexture2D(explosiontexturepool, "explosiontexture", 128, 128, &data[0][0][0], TEXTYPE_BGRA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE, NULL);
  85         for (y = 0;y < 128;y++)
  86                 for (x = 0;x < 128;x++)
  87                         data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
  88         explosiontexturefog = R_LoadTexture2D(explosiontexturepool, "explosiontexturefog", 128, 128, &data[0][0][0], TEXTYPE_BGRA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_PRECACHE, NULL);
  89         // note that explosions survive the restart
  90 }
  91
  92 static void r_explosion_shutdown(void)
  93 {
  94         R_FreeTexturePool(&explosiontexturepool);
  95 }
  96
  97 static void r_explosion_newmap(void)
  98 {
  99         numexplosions = 0;
 100         memset(explosion, 0, sizeof(explosion));
 101 }
 102
 103 static int R_ExplosionVert(int column, int row)
 104 {
 105         int i;
 106         float yaw, pitch;
 107         // top and bottom rows are all one position...
 108         if (row == 0 || row == EXPLOSIONGRID)
 109                 column = 0;
 110         i = row * (EXPLOSIONGRID + 1) + column;
 111         yaw = ((double) column / EXPLOSIONGRID) * M_PI * 2;
 112         pitch = (((double) row / EXPLOSIONGRID) - 0.5) * M_PI;
 113         explosionpoint[i][0] = cos(yaw) *  cos(pitch);
 114         explosionpoint[i][1] = sin(yaw) *  cos(pitch);
 115         explosionpoint[i][2] =        1 * -sin(pitch);
 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(const vec3_t org)
 148 {
 149         int i, j;
 150         float dist, n;
 151         explosion_t *e;
 152         trace_t trace;
 153         unsigned char noise[EXPLOSIONGRID*EXPLOSIONGRID];
 154         fractalnoisequick(noise, EXPLOSIONGRID, 4); // adjust noise grid size according to explosion
 155         for (i = 0, e = explosion;i < MAX_EXPLOSIONS;i++, e++)
 156         {
 157                 if (!e->alpha)
 158                 {
 159                         numexplosions = max(numexplosions, i + 1);
 160                         e->starttime = cl.time;
 161                         e->endtime = cl.time + cl_explosions_lifetime.value;
 162                         e->time = e->starttime;
 163                         e->alpha = cl_explosions_alpha_start.value;
 164                         e->fade = (cl_explosions_alpha_start.value - cl_explosions_alpha_end.value) / cl_explosions_lifetime.value;
 165                         e->clipping = r_explosionclip.integer != 0;
 166                         VectorCopy(org, e->origin);
 167                         for (j = 0;j < EXPLOSIONVERTS;j++)
 168                         {
 169                                 // calculate start origin and velocity
 170                                 n = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
 171                                 dist = n * cl_explosions_size_start.value;
 172                                 VectorMA(e->origin, dist, explosionpoint[j], e->vert[j]);
 173                                 dist = n * (cl_explosions_size_end.value - cl_explosions_size_start.value) / cl_explosions_lifetime.value;
 174                                 VectorScale(explosionpoint[j], dist, e->vertvel[j]);
 175                                 // clip start origin
 176                                 if (e->clipping)
 177                                 {
 178                                         trace = CL_Move(e->origin, vec3_origin, vec3_origin, e->vert[j], MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
 179                                         VectorCopy(trace.endpos, e->vert[i]);
 180                                 }
 181                         }
 182                         break;
 183                 }
 184         }
 185 }
 186
 187 static void R_DrawExplosion_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
 188 {
 189         int surfacelistindex = 0;
 190         const int numtriangles = EXPLOSIONTRIS, numverts = EXPLOSIONVERTS;
 191         rmeshstate_t m;
 192         GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
 193         GL_DepthMask(false);
 194         GL_DepthRange(0, 1);
 195         GL_PolygonOffset(r_refdef.polygonfactor, r_refdef.polygonoffset);
 196         GL_DepthTest(true);
 197         GL_CullFace(r_refdef.view.cullface_back);
 198         R_Mesh_Matrix(&identitymatrix);
 199
 200         R_Mesh_ColorPointer(NULL, 0, 0);
 201         memset(&m, 0, sizeof(m));
 202         m.tex[0] = R_GetTexture(explosiontexture);
 203         m.pointer_texcoord[0] = explosiontexcoord2f[0];
 204         R_Mesh_TextureState(&m);
 205         for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
 206         {
 207                 const explosion_t *e = explosion + surfacelist[surfacelistindex];
 208                 R_Mesh_VertexPointer(e->vert[0], 0, 0);
 209                 // FIXME: fixed function path can't properly handle r_refdef.view.colorscale > 1
 210                 GL_Color(e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, 1);
 211                 GL_LockArrays(0, numverts);
 212                 R_Mesh_Draw(0, numverts, numtriangles, explosiontris[0], 0, 0);
 213                 GL_LockArrays(0, 0);
 214         }
 215 }
 216
 217 static void R_MoveExplosion(explosion_t *e)
 218 {
 219         int i;
 220         float dot, end[3], frametime;
 221         trace_t trace;
 222
 223         frametime = cl.time - e->time;
 224         e->time = cl.time;
 225         e->alpha = e->alpha - (e->fade * frametime);
 226         if (e->alpha < 0 || cl.time > e->endtime)
 227         {
 228                 e->alpha = 0;
 229                 return;
 230         }
 231         for (i = 0;i < EXPLOSIONVERTS;i++)
 232         {
 233                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 234                 {
 235                         VectorMA(e->vert[i], frametime, e->vertvel[i], end);
 236                         if (e->clipping)
 237                         {
 238                                 trace = CL_Move(e->vert[i], vec3_origin, vec3_origin, end, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
 239                                 if (trace.fraction < 1)
 240                                 {
 241                                         // clip velocity against the wall
 242                                         dot = -DotProduct(e->vertvel[i], trace.plane.normal);
 243                                         VectorMA(e->vertvel[i], dot, trace.plane.normal, e->vertvel[i]);
 244                                 }
 245                                 VectorCopy(trace.endpos, e->vert[i]);
 246                         }
 247                         else
 248                                 VectorCopy(end, e->vert[i]);
 249                 }
 250         }
 251 }
 252
 253
 254 void R_MoveExplosions(void)
 255 {
 256         int i;
 257         for (i = 0;i < numexplosions;i++)
 258                 if (explosion[i].alpha)
 259                         R_MoveExplosion(&explosion[i]);
 260         while (numexplosions > 0 && explosion[i-1].alpha <= 0)
 261                 numexplosions--;
 262 }
 263
 264 void R_DrawExplosions(void)
 265 {
 266         int i;
 267
 268         if (!r_drawexplosions.integer)
 269                 return;
 270         for (i = 0;i < numexplosions;i++)
 271                 if (explosion[i].alpha)
 272                         R_MeshQueue_AddTransparent(explosion[i].origin, R_DrawExplosion_TransparentCallback, NULL, i, NULL);
 273 }
 274