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