r_light.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 // r_light.c
  21
  22 #include "quakedef.h"
  23 #include "cl_collision.h"
  24 #include "r_shadow.h"
  25
  26 dlight_t r_dlight[MAX_DLIGHTS];
  27 int r_numdlights = 0;
  28
  29 cvar_t r_modellights = {CVAR_SAVE, "r_modellights", "4"};
  30 cvar_t r_vismarklights = {0, "r_vismarklights", "1"};
  31 cvar_t r_coronas = {CVAR_SAVE, "r_coronas", "1"};
  32 cvar_t gl_flashblend = {CVAR_SAVE, "gl_flashblend", "0"};
  33
  34 static rtexture_t *lightcorona;
  35 static rtexturepool_t *lighttexturepool;
  36
  37 void r_light_start(void)
  38 {
  39         float dx, dy;
  40         int x, y, a;
  41         qbyte pixels[32][32][4];
  42         lighttexturepool = R_AllocTexturePool();
  43         for (y = 0;y < 32;y++)
  44         {
  45                 dy = (y - 15.5f) * (1.0f / 16.0f);
  46                 for (x = 0;x < 32;x++)
  47                 {
  48                         dx = (x - 15.5f) * (1.0f / 16.0f);
  49                         a = ((1.0f / (dx * dx + dy * dy + 0.2f)) - (1.0f / (1.0f + 0.2))) * 32.0f / (1.0f / (1.0f + 0.2));
  50                         a = bound(0, a, 255);
  51                         pixels[y][x][0] = a;
  52                         pixels[y][x][1] = a;
  53                         pixels[y][x][2] = a;
  54                         pixels[y][x][3] = 255;
  55                 }
  56         }
  57         lightcorona = R_LoadTexture2D(lighttexturepool, "lightcorona", 32, 32, &pixels[0][0][0], TEXTYPE_RGBA, TEXF_PRECACHE, NULL);
  58 }
  59
  60 void r_light_shutdown(void)
  61 {
  62         lighttexturepool = NULL;
  63         lightcorona = NULL;
  64 }
  65
  66 void r_light_newmap(void)
  67 {
  68         int i;
  69         for (i = 0;i < 256;i++)
  70                 d_lightstylevalue[i] = 264;             // normal light value
  71 }
  72
  73 void R_Light_Init(void)
  74 {
  75         Cvar_RegisterVariable(&r_modellights);
  76         Cvar_RegisterVariable(&r_vismarklights);
  77         Cvar_RegisterVariable(&r_coronas);
  78         Cvar_RegisterVariable(&gl_flashblend);
  79         R_RegisterModule("R_Light", r_light_start, r_light_shutdown, r_light_newmap);
  80 }
  81
  82 /*
  83 ==================
  84 R_UpdateLights
  85 ==================
  86 */
  87 void R_UpdateLights(void)
  88 {
  89         float frac;
  90         int i, j, k, l;
  91
  92 // light animations
  93 // 'm' is normal light, 'a' is no light, 'z' is double bright
  94         i = (int)(cl.time * 10);
  95         frac = (cl.time * 10) - i;
  96         for (j = 0;j < MAX_LIGHTSTYLES;j++)
  97         {
  98                 if (!cl_lightstyle || !cl_lightstyle[j].length)
  99                 {
 100                         d_lightstylevalue[j] = 256;
 101                         continue;
 102                 }
 103                 k = i % cl_lightstyle[j].length;
 104                 l = (i-1) % cl_lightstyle[j].length;
 105                 k = cl_lightstyle[j].map[k] - 'a';
 106                 l = cl_lightstyle[j].map[l] - 'a';
 107                 d_lightstylevalue[j] = ((k*frac)+(l*(1-frac)))*22;
 108         }
 109
 110         r_numdlights = 0;
 111         c_dlights = 0;
 112
 113         if (!r_dynamic.integer || !cl_dlights)
 114                 return;
 115
 116         // TODO: optimize to not scan whole cl_dlights array if possible
 117         for (i = 0;i < MAX_DLIGHTS;i++)
 118         {
 119                 if (cl_dlights[i].radius > 0)
 120                 {
 121                         R_RTLight_UpdateFromDLight(&cl_dlights[i].rtlight, &cl_dlights[i], false);
 122                         // FIXME: use pointer instead of copy
 123                         r_dlight[r_numdlights++] = cl_dlights[i];
 124                         c_dlights++; // count every dlight in use
 125                 }
 126         }
 127 }
 128
 129 void R_DrawCoronas(void)
 130 {
 131         int i, lnum, flag;
 132         float cscale, scale, viewdist, dist;
 133         dlight_t *light;
 134         if (r_coronas.value < 0.01)
 135                 return;
 136         R_Mesh_Matrix(&r_identitymatrix);
 137         viewdist = DotProduct(r_vieworigin, r_viewforward);
 138         flag = r_rtworld ? LIGHTFLAG_REALTIMEMODE : LIGHTFLAG_NORMALMODE;
 139         for (lnum = 0, light = r_shadow_worldlightchain;light;light = light->next, lnum++)
 140         {
 141                 if ((light->flags & flag) && light->corona * r_coronas.value > 0 && (r_shadow_debuglight.integer < 0 || r_shadow_debuglight.integer == lnum) && (dist = (DotProduct(light->rtlight.shadoworigin, r_viewforward) - viewdist)) >= 24.0f && CL_TraceBox(light->rtlight.shadoworigin, vec3_origin, vec3_origin, r_vieworigin, true, NULL, SUPERCONTENTS_SOLID, false).fraction == 1)
 142                 {
 143                         cscale = light->rtlight.corona * r_coronas.value * 0.25f;
 144                         scale = light->rtlight.radius * light->rtlight.coronasizescale;
 145                         R_DrawSprite(GL_ONE, GL_ONE, lightcorona, true, light->rtlight.shadoworigin, r_viewright, r_viewup, scale, -scale, -scale, scale, light->rtlight.color[0] * cscale, light->rtlight.color[1] * cscale, light->rtlight.color[2] * cscale, 1);
 146                 }
 147         }
 148         for (i = 0, light = r_dlight;i < r_numdlights;i++, light++)
 149         {
 150                 if ((light->flags & flag) && light->corona * r_coronas.value > 0 && (dist = (DotProduct(light->origin, r_viewforward) - viewdist)) >= 24.0f && CL_TraceBox(light->origin, vec3_origin, vec3_origin, r_vieworigin, true, NULL, SUPERCONTENTS_SOLID, false).fraction == 1)
 151                 {
 152                         cscale = light->corona * r_coronas.value * 0.25f;
 153                         scale = light->rtlight.radius * light->rtlight.coronasizescale;
 154                         if (gl_flashblend.integer)
 155                         {
 156                                 cscale *= 4.0f;
 157                                 scale *= 2.0f;
 158                         }
 159                         R_DrawSprite(GL_ONE, GL_ONE, lightcorona, true, light->origin, r_viewright, r_viewup, scale, -scale, -scale, scale, light->color[0] * cscale, light->color[1] * cscale, light->color[2] * cscale, 1);
 160                 }
 161         }
 162 }
 163
 164 /*
 165 =============================================================================
 166
 167 LIGHT SAMPLING
 168
 169 =============================================================================
 170 */
 171
 172 void R_CompleteLightPoint(vec3_t ambientcolor, vec3_t diffusecolor, vec3_t diffusenormal, const vec3_t p, int dynamic)
 173 {
 174         VectorClear(diffusecolor);
 175         VectorClear(diffusenormal);
 176
 177         if (!r_fullbright.integer && r_refdef.worldmodel && r_refdef.worldmodel->brush.LightPoint)
 178         {
 179                 ambientcolor[0] = ambientcolor[1] = ambientcolor[2] = r_ambient.value * (2.0f / 128.0f);
 180                 r_refdef.worldmodel->brush.LightPoint(r_refdef.worldmodel, p, ambientcolor, diffusecolor, diffusenormal);
 181         }
 182         else
 183                 VectorSet(ambientcolor, 1, 1, 1);
 184
 185         // FIXME: this .lights related stuff needs to be ported into the Mod_Q1BSP code
 186         if (r_refdef.worldmodel->brushq1.numlights)
 187         {
 188                 int i;
 189                 vec3_t v;
 190                 float f;
 191                 mlight_t *sl;
 192                 for (i = 0;i < r_refdef.worldmodel->brushq1.numlights;i++)
 193                 {
 194                         sl = r_refdef.worldmodel->brushq1.lights + i;
 195                         if (d_lightstylevalue[sl->style] > 0)
 196                         {
 197                                 VectorSubtract (p, sl->origin, v);
 198                                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract);
 199                                 if (f > 0 && CL_TraceBox(p, vec3_origin, vec3_origin, sl->origin, false, NULL, SUPERCONTENTS_SOLID, false).fraction == 1)
 200                                 {
 201                                         f *= d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 202                                         VectorMA(ambientcolor, f, sl->light, ambientcolor);
 203                                 }
 204                         }
 205                 }
 206         }
 207
 208         if (dynamic)
 209         {
 210                 int i;
 211                 float f, v[3];
 212                 dlight_t *light;
 213                 // FIXME: this really should handle dlights as diffusecolor/diffusenormal somehow
 214                 for (i = 0;i < r_numdlights;i++)
 215                 {
 216                         light = r_dlight + i;
 217                         VectorSubtract(p, light->origin, v);
 218                         f = DotProduct(v, v);
 219                         if (f < light->rtlight.lightmap_cullradius2 && CL_TraceBox(p, vec3_origin, vec3_origin, light->origin, false, NULL, SUPERCONTENTS_SOLID, false).fraction == 1)
 220                         {
 221                                 f = (1.0f / (f + LIGHTOFFSET)) - light->rtlight.lightmap_subtract;
 222                                 VectorMA(ambientcolor, f, light->rtlight.lightmap_light, ambientcolor);
 223                         }
 224                 }
 225         }
 226 }
 227
 228 typedef struct
 229 {
 230         vec3_t origin;
 231         //vec_t cullradius2;
 232         vec3_t light;
 233         // how much this light would contribute to ambient if replaced
 234         vec3_t ambientlight;
 235         vec_t subtract;
 236         vec_t falloff;
 237         vec_t offset;
 238         // used for choosing only the brightest lights
 239         vec_t intensity;
 240 }
 241 nearlight_t;
 242
 243 static int nearlights;
 244 static nearlight_t nearlight[MAX_DLIGHTS];
 245
 246 int R_LightModel(float *ambient4f, float *diffusecolor, float *diffusenormal, const entity_render_t *ent, float colorr, float colorg, float colorb, float colora, int worldcoords)
 247 {
 248         int i, j, maxnearlights;
 249         float v[3], f, mscale, stylescale, intensity, ambientcolor[3], tempdiffusenormal[3];
 250         nearlight_t *nl;
 251         mlight_t *sl;
 252         dlight_t *light;
 253
 254         nearlights = 0;
 255         maxnearlights = r_modellights.integer;
 256         ambient4f[0] = ambient4f[1] = ambient4f[2] = r_ambient.value * (2.0f / 128.0f);
 257         VectorClear(diffusecolor);
 258         VectorClear(diffusenormal);
 259         if (!(ent->flags & RENDER_LIGHT))
 260         {
 261                 // highly rare
 262                 VectorSet(ambient4f, 1, 1, 1);
 263                 maxnearlights = 0;
 264         }
 265         else if (r_lightmapintensity <= 0 && !(ent->flags & RENDER_TRANSPARENT))
 266                 maxnearlights = 0;
 267         else
 268         {
 269                 if (r_refdef.worldmodel && r_refdef.worldmodel->brush.LightPoint)
 270                 {
 271                         r_refdef.worldmodel->brush.LightPoint(r_refdef.worldmodel, ent->origin, ambient4f, diffusecolor, tempdiffusenormal);
 272                         Matrix4x4_Transform3x3(&ent->inversematrix, tempdiffusenormal, diffusenormal);
 273                         VectorNormalize(diffusenormal);
 274                 }
 275                 else
 276                         VectorSet(ambient4f, 1, 1, 1);
 277         }
 278
 279         // scale of the model's coordinate space, to alter light attenuation to match
 280         // make the mscale squared so it can scale the squared distance results
 281         mscale = ent->scale * ent->scale;
 282         // FIXME: no support for .lights on non-Q1BSP?
 283         nl = &nearlight[0];
 284         for (i = 0;i < ent->numentlights;i++)
 285         {
 286                 sl = r_refdef.worldmodel->brushq1.lights + ent->entlights[i];
 287                 stylescale = d_lightstylevalue[sl->style] * (1.0f / 65536.0f);
 288                 VectorSubtract (ent->origin, sl->origin, v);
 289                 f = ((1.0f / (DotProduct(v, v) * sl->falloff + sl->distbias)) - sl->subtract) * stylescale;
 290                 VectorScale(sl->light, f, ambientcolor);
 291                 intensity = DotProduct(ambientcolor, ambientcolor);
 292                 if (f < 0)
 293                         intensity *= -1.0f;
 294                 if (nearlights < maxnearlights)
 295                         j = nearlights++;
 296                 else
 297                 {
 298                         for (j = 0;j < maxnearlights;j++)
 299                         {
 300                                 if (nearlight[j].intensity < intensity)
 301                                 {
 302                                         if (nearlight[j].intensity > 0)
 303                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 304                                         break;
 305                                 }
 306                         }
 307                 }
 308                 if (j >= maxnearlights)
 309                 {
 310                         // this light is less significant than all others,
 311                         // add it to ambient
 312                         if (intensity > 0)
 313                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 314                 }
 315                 else
 316                 {
 317                         nl = nearlight + j;
 318                         nl->intensity = intensity;
 319                         // transform the light into the model's coordinate system
 320                         if (worldcoords)
 321                                 VectorCopy(sl->origin, nl->origin);
 322                         else
 323                                 Matrix4x4_Transform(&ent->inversematrix, sl->origin, nl->origin);
 324                         // integrate mscale into falloff, for maximum speed
 325                         nl->falloff = sl->falloff * mscale;
 326                         VectorCopy(ambientcolor, nl->ambientlight);
 327                         nl->light[0] = sl->light[0] * stylescale * colorr * 4.0f;
 328                         nl->light[1] = sl->light[1] * stylescale * colorg * 4.0f;
 329                         nl->light[2] = sl->light[2] * stylescale * colorb * 4.0f;
 330                         nl->subtract = sl->subtract;
 331                         nl->offset = sl->distbias;
 332                 }
 333         }
 334         if (ent->flags & RENDER_TRANSPARENT)
 335         {
 336                 // FIXME: this dlighting doesn't look like rtlights
 337                 for (i = 0;i < r_numdlights;i++)
 338                 {
 339                         light = r_dlight + i;
 340                         VectorCopy(light->origin, v);
 341                         if (v[0] < ent->mins[0]) v[0] = ent->mins[0];if (v[0] > ent->maxs[0]) v[0] = ent->maxs[0];
 342                         if (v[1] < ent->mins[1]) v[1] = ent->mins[1];if (v[1] > ent->maxs[1]) v[1] = ent->maxs[1];
 343                         if (v[2] < ent->mins[2]) v[2] = ent->mins[2];if (v[2] > ent->maxs[2]) v[2] = ent->maxs[2];
 344                         VectorSubtract (v, light->origin, v);
 345                         if (DotProduct(v, v) < light->rtlight.lightmap_cullradius2)
 346                         {
 347                                 if (CL_TraceBox(ent->origin, vec3_origin, vec3_origin, light->origin, false, NULL, SUPERCONTENTS_SOLID, false).fraction != 1)
 348                                         continue;
 349                                 VectorSubtract (ent->origin, light->origin, v);
 350                                 f = ((1.0f / (DotProduct(v, v) + LIGHTOFFSET)) - light->rtlight.lightmap_subtract);
 351                                 VectorScale(light->rtlight.lightmap_light, f, ambientcolor);
 352                                 intensity = DotProduct(ambientcolor, ambientcolor);
 353                                 if (f < 0)
 354                                         intensity *= -1.0f;
 355                                 if (nearlights < maxnearlights)
 356                                         j = nearlights++;
 357                                 else
 358                                 {
 359                                         for (j = 0;j < maxnearlights;j++)
 360                                         {
 361                                                 if (nearlight[j].intensity < intensity)
 362                                                 {
 363                                                         if (nearlight[j].intensity > 0)
 364                                                                 VectorAdd(ambient4f, nearlight[j].ambientlight, ambient4f);
 365                                                         break;
 366                                                 }
 367                                         }
 368                                 }
 369                                 if (j >= maxnearlights)
 370                                 {
 371                                         // this light is less significant than all others,
 372                                         // add it to ambient
 373                                         if (intensity > 0)
 374                                                 VectorAdd(ambient4f, ambientcolor, ambient4f);
 375                                 }
 376                                 else
 377                                 {
 378                                         nl = nearlight + j;
 379                                         nl->intensity = intensity;
 380                                         // transform the light into the model's coordinate system
 381                                         if (worldcoords)
 382                                                 VectorCopy(light->origin, nl->origin);
 383                                         else
 384                                         {
 385                                                 Matrix4x4_Transform(&ent->inversematrix, light->origin, nl->origin);
 386                                                 /*
 387                                                 Con_Printf("%i %s : %f %f %f : %f %f %f\n%f %f %f %f\n%f %f %f %f\n%f %f %f %f\n%f %f %f %f\n"
 388                                                 , rd - r_dlight, ent->model->name
 389                                                 , light->origin[0], light->origin[1], light->origin[2]
 390                                                 , nl->origin[0], nl->origin[1], nl->origin[2]
 391                                                 , ent->inversematrix.m[0][0], ent->inversematrix.m[0][1], ent->inversematrix.m[0][2], ent->inversematrix.m[0][3]
 392                                                 , ent->inversematrix.m[1][0], ent->inversematrix.m[1][1], ent->inversematrix.m[1][2], ent->inversematrix.m[1][3]
 393                                                 , ent->inversematrix.m[2][0], ent->inversematrix.m[2][1], ent->inversematrix.m[2][2], ent->inversematrix.m[2][3]
 394                                                 , ent->inversematrix.m[3][0], ent->inversematrix.m[3][1], ent->inversematrix.m[3][2], ent->inversematrix.m[3][3]);
 395                                                 */
 396                                         }
 397                                         // integrate mscale into falloff, for maximum speed
 398                                         nl->falloff = mscale;
 399                                         VectorCopy(ambientcolor, nl->ambientlight);
 400                                         nl->light[0] = light->rtlight.lightmap_light[0] * colorr * 4.0f;
 401                                         nl->light[1] = light->rtlight.lightmap_light[1] * colorg * 4.0f;
 402                                         nl->light[2] = light->rtlight.lightmap_light[2] * colorb * 4.0f;
 403                                         nl->subtract = light->rtlight.lightmap_subtract;
 404                                         nl->offset = LIGHTOFFSET;
 405                                 }
 406                         }
 407                 }
 408         }
 409         ambient4f[0] *= colorr;
 410         ambient4f[1] *= colorg;
 411         ambient4f[2] *= colorb;
 412         ambient4f[3] = colora;
 413         diffusecolor[0] *= colorr;
 414         diffusecolor[1] *= colorg;
 415         diffusecolor[2] *= colorb;
 416         return nearlights != 0 || DotProduct(diffusecolor, diffusecolor) > 0;
 417 }
 418
 419 void R_LightModel_CalcVertexColors(const float *ambientcolor4f, const float *diffusecolor, const float *diffusenormal, int numverts, const float *vertex3f, const float *normal3f, float *color4f)
 420 {
 421         int i, j, usediffuse;
 422         float color[4], v[3], dot, dist2, f, dnormal[3];
 423         nearlight_t *nl;
 424         usediffuse = DotProduct(diffusecolor, diffusecolor) > 0;
 425         // negate the diffuse normal to avoid the need to negate the
 426         // dotproduct on each vertex
 427         VectorNegate(diffusenormal, dnormal);
 428         if (usediffuse)
 429                 VectorNormalize(dnormal);
 430         // directional shading code here
 431         for (i = 0;i < numverts;i++, vertex3f += 3, normal3f += 3, color4f += 4)
 432         {
 433                 VectorCopy4(ambientcolor4f, color);
 434
 435                 // silly directional diffuse shading
 436                 if (usediffuse)
 437                 {
 438                         dot = DotProduct(normal3f, dnormal);
 439                         if (dot > 0)
 440                                 VectorMA(color, dot, diffusecolor, color);
 441                 }
 442
 443                 // pretty good lighting
 444                 for (j = 0, nl = &nearlight[0];j < nearlights;j++, nl++)
 445                 {
 446                         VectorSubtract(nl->origin, vertex3f, v);
 447                         // first eliminate negative lighting (back side)
 448                         dot = DotProduct(normal3f, v);
 449                         if (dot > 0)
 450                         {
 451                                 // we'll need this again later to normalize the dotproduct
 452                                 dist2 = DotProduct(v,v);
 453                                 // do the distance attenuation math
 454                                 f = (1.0f / (dist2 * nl->falloff + nl->offset)) - nl->subtract;
 455                                 if (f > 0)
 456                                 {
 457                                         // we must divide dot by sqrt(dist2) to compensate for
 458                                         // the fact we did not normalize v before doing the
 459                                         // dotproduct, the result is in the range 0 to 1 (we
 460                                         // eliminated negative numbers already)
 461                                         f *= dot / sqrt(dist2);
 462                                         // blend in the lighting
 463                                         VectorMA(color, f, nl->light, color);
 464                                 }
 465                         }
 466                 }
 467                 VectorCopy4(color, color4f);
 468         }
 469 }
 470
 471 void R_UpdateEntLights(entity_render_t *ent)
 472 {
 473         int i;
 474         const mlight_t *sl;
 475         vec3_t v;
 476         if (r_lightmapintensity <= 0 && !(ent->flags & RENDER_TRANSPARENT))
 477                 return;
 478         VectorSubtract(ent->origin, ent->entlightsorigin, v);
 479         if (ent->entlightsframe != (r_framecount - 1) || (realtime > ent->entlightstime && DotProduct(v,v) >= 1.0f))
 480         {
 481                 ent->entlightstime = realtime + 0.1;
 482                 VectorCopy(ent->origin, ent->entlightsorigin);
 483                 ent->numentlights = 0;
 484                 if (r_refdef.worldmodel)
 485                         for (i = 0, sl = r_refdef.worldmodel->brushq1.lights;i < r_refdef.worldmodel->brushq1.numlights && ent->numentlights < MAXENTLIGHTS;i++, sl++)
 486                                 if (CL_TraceBox(ent->origin, vec3_origin, vec3_origin, sl->origin, false, NULL, SUPERCONTENTS_SOLID, false).fraction == 1)
 487                                         ent->entlights[ent->numentlights++] = i;
 488         }
 489         ent->entlightsframe = r_framecount;
 490 }
 491