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 float explosiontexcoord2f[EXPLOSIONVERTS][2];
  30 static int explosiontris[EXPLOSIONTRIS][3];
  31 static int explosionnoiseindex[EXPLOSIONVERTS];
  32 static vec3_t explosionpoint[EXPLOSIONVERTS];
  33
  34 typedef struct explosion_s
  35 {
  36         float starttime;
  37         float endtime;
  38         float time;
  39         float alpha;
  40         float fade;
  41         vec3_t origin;
  42         vec3_t vert[EXPLOSIONVERTS];
  43         vec3_t vertvel[EXPLOSIONVERTS];
  44         qboolean clipping;
  45 }
  46 explosion_t;
  47
  48 static explosion_t explosion[MAX_EXPLOSIONS];
  49
  50 static rtexture_t       *explosiontexture;
  51 static rtexture_t       *explosiontexturefog;
  52
  53 static rtexturepool_t   *explosiontexturepool;
  54
  55 cvar_t r_explosionclip = {CVAR_SAVE, "r_explosionclip", "1", "enables collision detection for explosion shell (so that it flattens against walls and floors)"};
  56 static cvar_t r_drawexplosions = {0, "r_drawexplosions", "1", "enables rendering of explosion shells (see also cl_particles_explosions_shell)"};
  57
  58 static void r_explosion_start(void)
  59 {
  60         int x, y;
  61         unsigned char 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 static void r_explosion_shutdown(void)
  91 {
  92         R_FreeTexturePool(&explosiontexturepool);
  93 }
  94
  95 static void r_explosion_newmap(void)
  96 {
  97         memset(explosion, 0, sizeof(explosion));
  98 }
  99
 100 static 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         explosiontexcoord2f[i][0] = (float) column / (float) EXPLOSIONGRID;
 114         explosiontexcoord2f[i][1] = (float) row / (float) EXPLOSIONGRID;
 115         explosionnoiseindex[i] = (row % EXPLOSIONGRID) * EXPLOSIONGRID + (column % EXPLOSIONGRID);
 116         return i;
 117 }
 118
 119 void R_Explosion_Init(void)
 120 {
 121         int i, x, y;
 122         i = 0;
 123         for (y = 0;y < EXPLOSIONGRID;y++)
 124         {
 125                 for (x = 0;x < EXPLOSIONGRID;x++)
 126                 {
 127                         explosiontris[i][0] = R_ExplosionVert(x    , y    );
 128                         explosiontris[i][1] = R_ExplosionVert(x + 1, y    );
 129                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 130                         i++;
 131                         explosiontris[i][0] = R_ExplosionVert(x + 1, y    );
 132                         explosiontris[i][1] = R_ExplosionVert(x + 1, y + 1);
 133                         explosiontris[i][2] = R_ExplosionVert(x    , y + 1);
 134                         i++;
 135                 }
 136         }
 137
 138         Cvar_RegisterVariable(&r_explosionclip);
 139         Cvar_RegisterVariable(&r_drawexplosions);
 140
 141         R_RegisterModule("R_Explosions", r_explosion_start, r_explosion_shutdown, r_explosion_newmap);
 142 }
 143
 144 void R_NewExplosion(const vec3_t org)
 145 {
 146         int i, j;
 147         float dist, n;
 148         explosion_t *e;
 149         trace_t trace;
 150         unsigned char noise[EXPLOSIONGRID*EXPLOSIONGRID];
 151         fractalnoisequick(noise, EXPLOSIONGRID, 4); // adjust noise grid size according to explosion
 152         for (i = 0, e = explosion;i < MAX_EXPLOSIONS;i++, e++)
 153         {
 154                 if (!e->alpha)
 155                 {
 156                         e->starttime = cl.time;
 157                         e->endtime = cl.time + cl_explosions_lifetime.value;
 158                         e->time = e->starttime;
 159                         e->alpha = cl_explosions_alpha_start.value;
 160                         e->fade = (cl_explosions_alpha_start.value - cl_explosions_alpha_end.value) / cl_explosions_lifetime.value;
 161                         e->clipping = r_explosionclip.integer != 0;
 162                         VectorCopy(org, e->origin);
 163                         for (j = 0;j < EXPLOSIONVERTS;j++)
 164                         {
 165                                 // calculate start origin and velocity
 166                                 n = noise[explosionnoiseindex[j]] * (1.0f / 255.0f) + 0.5;
 167                                 dist = n * cl_explosions_size_start.value;
 168                                 VectorMA(e->origin, dist, explosionpoint[j], e->vert[j]);
 169                                 dist = n * (cl_explosions_size_end.value - cl_explosions_size_start.value) / cl_explosions_lifetime.value;
 170                                 VectorScale(explosionpoint[j], dist, e->vertvel[j]);
 171                                 // clip start origin
 172                                 if (e->clipping)
 173                                 {
 174                                         trace = CL_Move(e->origin, vec3_origin, vec3_origin, e->vert[j], MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
 175                                         VectorCopy(trace.endpos, e->vert[i]);
 176                                 }
 177                         }
 178                         break;
 179                 }
 180         }
 181 }
 182
 183 static void R_DrawExplosion_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
 184 {
 185         int surfacelistindex = 0;
 186         const int numtriangles = EXPLOSIONTRIS, numverts = EXPLOSIONVERTS;
 187         rmeshstate_t m;
 188         GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
 189         GL_DepthMask(false);
 190         GL_DepthTest(true);
 191         GL_CullFace(GL_FRONT); // quake is backwards, this culls back faces
 192         R_Mesh_Matrix(&identitymatrix);
 193
 194         R_Mesh_ColorPointer(NULL);
 195         memset(&m, 0, sizeof(m));
 196         m.tex[0] = R_GetTexture(explosiontexture);
 197         m.pointer_texcoord[0] = explosiontexcoord2f[0];
 198         R_Mesh_TextureState(&m);
 199         for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
 200         {
 201                 const explosion_t *e = explosion + surfacelist[surfacelistindex];
 202                 R_Mesh_VertexPointer(e->vert[0]);
 203                 // FIXME: fixed function path can't properly handle r_view.colorscale > 1
 204                 GL_Color(e->alpha * r_view.colorscale, e->alpha * r_view.colorscale, e->alpha * r_view.colorscale, 1);
 205                 GL_LockArrays(0, numverts);
 206                 R_Mesh_Draw(0, numverts, numtriangles, explosiontris[0]);
 207                 GL_LockArrays(0, 0);
 208         }
 209 }
 210
 211 static void R_MoveExplosion(explosion_t *e)
 212 {
 213         int i;
 214         float dot, end[3], frametime;
 215         trace_t trace;
 216
 217         frametime = cl.time - e->time;
 218         e->time = cl.time;
 219         e->alpha = e->alpha - (e->fade * frametime);
 220         if (e->alpha < 0 || cl.time > e->endtime)
 221         {
 222                 e->alpha = 0;
 223                 return;
 224         }
 225         for (i = 0;i < EXPLOSIONVERTS;i++)
 226         {
 227                 if (e->vertvel[i][0] || e->vertvel[i][1] || e->vertvel[i][2])
 228                 {
 229                         VectorMA(e->vert[i], frametime, e->vertvel[i], end);
 230                         if (e->clipping)
 231                         {
 232                                 trace = CL_Move(e->vert[i], vec3_origin, vec3_origin, end, MOVE_NOMONSTERS, NULL, SUPERCONTENTS_SOLID, true, false, NULL, false);
 233                                 if (trace.fraction < 1)
 234                                 {
 235                                         // clip velocity against the wall
 236                                         dot = -DotProduct(e->vertvel[i], trace.plane.normal);
 237                                         VectorMA(e->vertvel[i], dot, trace.plane.normal, e->vertvel[i]);
 238                                 }
 239                                 VectorCopy(trace.endpos, e->vert[i]);
 240                         }
 241                         else
 242                                 VectorCopy(end, e->vert[i]);
 243                 }
 244         }
 245 }
 246
 247
 248 void R_MoveExplosions(void)
 249 {
 250         int i;
 251         for (i = 0;i < MAX_EXPLOSIONS;i++)
 252                 if (explosion[i].alpha)
 253                         R_MoveExplosion(&explosion[i]);
 254 }
 255
 256 void R_DrawExplosions(void)
 257 {
 258         int i;
 259
 260         if (!r_drawexplosions.integer)
 261                 return;
 262         for (i = 0;i < MAX_EXPLOSIONS;i++)
 263                 if (explosion[i].alpha)
 264                         R_MeshQueue_AddTransparent(explosion[i].origin, R_DrawExplosion_TransparentCallback, NULL, i, NULL);
 265 }
 266