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 extern qboolean r_loadfog;
  63 static void r_explosion_start(void)
  64 {
  65         int x, y;
  66         static unsigned char noise1[128][128], noise2[128][128], noise3[128][128], data[128][128][4];
  67         explosiontexturepool = R_AllocTexturePool();
  68         explosiontexture = NULL;
  69         explosiontexturefog = NULL;
  70         fractalnoise(&noise1[0][0], 128, 32);
  71         fractalnoise(&noise2[0][0], 128, 4);
  72         fractalnoise(&noise3[0][0], 128, 4);
  73         for (y = 0;y < 128;y++)
  74         {
  75                 for (x = 0;x < 128;x++)
  76                 {
  77                         int j, r, g, b, a;
  78                         j = (noise1[y][x] * noise2[y][x]) * 3 / 256 - 128;
  79                         r = (j * 512) / 256;
  80                         g = (j * 256) / 256;
  81                         b = (j * 128) / 256;
  82                         a = noise3[y][x] * 3 - 128;
  83                         data[y][x][2] = bound(0, r, 255);
  84                         data[y][x][1] = bound(0, g, 255);
  85                         data[y][x][0] = bound(0, b, 255);
  86                         data[y][x][3] = bound(0, a, 255);
  87                 }
  88         }
  89         explosiontexture = R_LoadTexture2D(explosiontexturepool, "explosiontexture", 128, 128, &data[0][0][0], TEXTYPE_BGRA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_FORCELINEAR, NULL);
  90         if (r_loadfog)
  91         {
  92                 for (y = 0;y < 128;y++)
  93                         for (x = 0;x < 128;x++)
  94                                 data[y][x][0] = data[y][x][1] = data[y][x][2] = 255;
  95                 explosiontexturefog = R_LoadTexture2D(explosiontexturepool, "explosiontexture_fog", 128, 128, &data[0][0][0], TEXTYPE_BGRA, TEXF_MIPMAP | TEXF_ALPHA | TEXF_FORCELINEAR, NULL);
  96         }
  97         // note that explosions survive the restart
  98 }
  99
 100 static void r_explosion_shutdown(void)
 101 {
 102         R_FreeTexturePool(&explosiontexturepool);
 103 }
 104
 105 static void r_explosion_newmap(void)
 106 {
 107         numexplosions = 0;
 108         memset(explosion, 0, sizeof(explosion));
 109 }
 110
 111 static int R_ExplosionVert(int column, int row)
 112 {
 113         int i;
 114         float yaw, pitch;
 115         // top and bottom rows are all one position...
 116         if (row == 0 || row == EXPLOSIONGRID)
 117                 column = 0;
 118         i = row * (EXPLOSIONGRID + 1) + column;
 119         yaw = ((double) column / EXPLOSIONGRID) * M_PI * 2;
 120         pitch = (((double) row / EXPLOSIONGRID) - 0.5) * M_PI;
 121         explosionpoint[i][0] = cos(yaw) *  cos(pitch);
 122         explosionpoint[i][1] = sin(yaw) *  cos(pitch);
 123         explosionpoint[i][2] =        1 * -sin(pitch);
 124         explosiontexcoord2f[i][0] = (float) column / (float) EXPLOSIONGRID;
 125         explosiontexcoord2f[i][1] = (float) row / (float) EXPLOSIONGRID;
 126         explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
 127         return i;
 128 }
 129 #endif
 130
 131 void R_Explosion_Init(void)
 132 {
 133 #ifdef MAX_EXPLOSIONS
 134         int i, x, y;
 135         i = 0;
 136         for (y = 0;y < EXPLOSIONGRID;y++)
 137         {
 138                 for (x = 0;x < EXPLOSIONGRID;x++)
 139                 {
 140                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 141                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 142                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 143                         i++;
 144                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 145                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 146                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 147                         i++;
 148                 }
 149         }
 150
 151 #endif
 152         Cvar_RegisterVariable(&r_explosionclip);
 153 #ifdef MAX_EXPLOSIONS
 154         Cvar_RegisterVariable(&r_drawexplosions);
 155
 156         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
 157 #endif
 158 }
 159
 160 void R_NewExplosion(const vec3_t org)
 161 {
 162 #ifdef MAX_EXPLOSIONS
 163         int i, j;
 164         float dist, n;
 165         explosion_t *e;
 166         trace_t trace;
 167         unsigned char noise[EXPLOSIONGRID*EXPLOSIONGRID];
 168         fractalnoisequick(noise, EXPLOSIONGRID, 4); // adjust noise grid size according to explosion
 169         for (i = 0, e = explosion;i < MAX_EXPLOSIONS;i++, e++)
 170         {
 171                 if (!e->alpha)
 172                 {
 173                         numexplosions = max(numexplosions, i + 1);
 174                         e->starttime = cl.time;
 175                         e->endtime = cl.time + cl_explosions_lifetime.value;
 176                         e->time = e->starttime;
 177                         e->alpha = cl_explosions_alpha_start.value;
 178                         e->fade = (cl_explosions_alpha_start.value - cl_explosions_alpha_end.value) / cl_explosions_lifetime.value;
 179                         e->clipping = r_explosionclip.integer != 0;
 180                         VectorCopy(org, e->origin);
 181                         for (j = 0;j < EXPLOSIONVERTS;j++)
 182                         {
 183                                 // calculate start origin and velocity
 184                                 n = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
 185                                 dist = n * cl_explosions_size_start.value;
 186                                 VectorMA(e->origin, dist, explosionpoint[j], e->vert[j]);
 187                                 dist = n * (cl_explosions_size_end.value - cl_explosions_size_start.value) / cl_explosions_lifetime.value;
 188                                 VectorScale(explosionpoint[j], dist, e->vertvel[j]);
 189                                 // clip start origin
 190                                 if (e->clipping)
 191                                 {
 192                                         trace = CL_TraceLine(e->origin, e->vert[j], MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
 193                                         VectorCopy(trace.endpos, e->vert[i]);
 194                                 }
 195                         }
 196                         break;
 197                 }
 198         }
 199 #endif
 200 }
 201
 202 #ifdef MAX_EXPLOSIONS
 203 static void R_DrawExplosion_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
 204 {
 205         int surfacelistindex = 0;
 206         const int numtriangles = EXPLOSIONTRIS, numverts = EXPLOSIONVERTS;
 207         GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
 208         GL_DepthMask(false);
 209         GL_DepthRange(0, 1);
 210         GL_PolygonOffset(r_refdef.polygonfactor, r_refdef.polygonoffset);
 211         GL_DepthTest(true);
 212         GL_CullFace(r_refdef.view.cullface_back);
 213         R_EntityMatrix(&identitymatrix);
 214
 215         R_Mesh_ColorPointer(NULL, 0, 0);
 216         R_Mesh_ResetTextureState();
 217         R_SetupShader_Generic(explosiontexture, NULL, GL_MODULATE, 1);
 218         R_Mesh_TexCoordPointer(0, 2, explosiontexcoord2f[0], 0, 0);
 219         for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
 220         {
 221                 const explosion_t *e = explosion + surfacelist[surfacelistindex];
 222                 R_Mesh_VertexPointer(e->vert[0], 0, 0);
 223                 // FIXME: fixed function path can't properly handle r_refdef.view.colorscale > 1
 224                 GL_Color(e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, 1);
 225                 GL_LockArrays(0, numverts);
 226                 R_Mesh_Draw(0, numverts, 0, numtriangles, NULL, explosiontris[0], 0, 0);
 227                 GL_LockArrays(0, 0);
 228         }
 229 }
 230
 231 static void R_MoveExplosion(explosion_t *e)
 232 {
 233         int i;
 234         float dot, end[3], frametime;
 235         trace_t trace;
 236
 237         frametime = cl.time - e->time;
 238         e->time = cl.time;
 239         e->alpha = e->alpha - (e->fade * frametime);
 240         if (e->alpha < 0 || cl.time > e->endtime)
 241         {
 242                 e->alpha = 0;
 243                 return;
 244         }
 245         for (i = 0;i < EXPLOSIONVERTS;i++)
 246         {
 247                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 248                 {
 249                         VectorMA(e->vert[i], frametime, e->vertvel[i], end);
 250                         if (e->clipping)
 251                         {
 252                                 trace = CL_TraceLine(e->vert[i], end, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
 253                                 if (trace.fraction < 1)
 254                                 {
 255                                         // clip velocity against the wall
 256                                         dot = -DotProduct(e->vertvel[i], trace.plane.normal);
 257                                         VectorMA(e->vertvel[i], dot, trace.plane.normal, e->vertvel[i]);
 258                                 }
 259                                 VectorCopy(trace.endpos, e->vert[i]);
 260                         }
 261                         else
 262                                 VectorCopy(end, e->vert[i]);
 263                 }
 264         }
 265 }
 266 #endif
 267
 268 void R_DrawExplosions(void)
 269 {
 270 #ifdef MAX_EXPLOSIONS
 271         int i;
 272
 273         if (!r_drawexplosions.integer)
 274                 return;
 275
 276         for (i = 0;i < numexplosions;i++)
 277         {
 278                 if (explosion[i].alpha)
 279                 {
 280                         R_MoveExplosion(&explosion[i]);
 281                         if (explosion[i].alpha)
 282                                 R_MeshQueue_AddTransparent(explosion[i].origin, R_DrawExplosion_TransparentCallback, NULL, i, NULL);
 283                 }
 284         }
 285         while (numexplosions > 0 && explosion[i-1].alpha <= 0)
 286                 numexplosions--;
 287 #endif
 288 }
 289