src/client/sky.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "sky.h"
  21 #include "IVideoDriver.h"
  22 #include "ISceneManager.h"
  23 #include "ICameraSceneNode.h"
  24 #include "S3DVertex.h"
  25 #include "client/tile.h"
  26 #include "noise.h"  // easeCurve
  27 #include "profiler.h"
  28 #include "util/numeric.h"
  29 #include <cmath>
  30 #include "client/renderingengine.h"
  31 #include "settings.h"
  32 #include "camera.h"  // CameraModes
  33
  34
  35 Sky::Sky(s32 id, ITextureSource *tsrc):
  36                 scene::ISceneNode(RenderingEngine::get_scene_manager()->getRootSceneNode(),
  37                         RenderingEngine::get_scene_manager(), id)
  38 {
  39         setAutomaticCulling(scene::EAC_OFF);
  40         m_box.MaxEdge.set(0, 0, 0);
  41         m_box.MinEdge.set(0, 0, 0);
  42
  43         // Create material
  44
  45         video::SMaterial mat;
  46         mat.Lighting = false;
  47 #ifdef __ANDROID__
  48         mat.ZBuffer = video::ECFN_DISABLED;
  49 #else
  50         mat.ZBuffer = video::ECFN_NEVER;
  51 #endif
  52         mat.ZWriteEnable = false;
  53         mat.AntiAliasing = 0;
  54         mat.TextureLayer[0].TextureWrapU = video::ETC_CLAMP_TO_EDGE;
  55         mat.TextureLayer[0].TextureWrapV = video::ETC_CLAMP_TO_EDGE;
  56         mat.BackfaceCulling = false;
  57
  58         m_materials[0] = mat;
  59
  60         m_materials[1] = mat;
  61         //m_materials[1].MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  62         m_materials[1].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  63
  64         m_materials[2] = mat;
  65         m_materials[2].setTexture(0, tsrc->getTextureForMesh("sunrisebg.png"));
  66         m_materials[2].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  67         //m_materials[2].MaterialType = video::EMT_TRANSPARENT_ADD_COLOR;
  68
  69         m_sun_texture = tsrc->isKnownSourceImage("sun.png") ?
  70                 tsrc->getTextureForMesh("sun.png") : NULL;
  71         m_moon_texture = tsrc->isKnownSourceImage("moon.png") ?
  72                 tsrc->getTextureForMesh("moon.png") : NULL;
  73         m_sun_tonemap = tsrc->isKnownSourceImage("sun_tonemap.png") ?
  74                 tsrc->getTexture("sun_tonemap.png") : NULL;
  75         m_moon_tonemap = tsrc->isKnownSourceImage("moon_tonemap.png") ?
  76                 tsrc->getTexture("moon_tonemap.png") : NULL;
  77
  78         if (m_sun_texture) {
  79                 m_materials[3] = mat;
  80                 m_materials[3].setTexture(0, m_sun_texture);
  81                 m_materials[3].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  82                 if (m_sun_tonemap)
  83                         m_materials[3].Lighting = true;
  84         }
  85
  86         if (m_moon_texture) {
  87                 m_materials[4] = mat;
  88                 m_materials[4].setTexture(0, m_moon_texture);
  89                 m_materials[4].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  90                 if (m_moon_tonemap)
  91                         m_materials[4].Lighting = true;
  92         }
  93
  94         for (v3f &star : m_stars) {
  95                 star = v3f(
  96                         myrand_range(-10000, 10000),
  97                         myrand_range(-10000, 10000),
  98                         myrand_range(-10000, 10000)
  99                 );
 100                 star.normalize();
 101         }
 102
 103         m_directional_colored_fog = g_settings->getBool("directional_colored_fog");
 104 }
 105
 106
 107 void Sky::OnRegisterSceneNode()
 108 {
 109         if (IsVisible)
 110                 SceneManager->registerNodeForRendering(this, scene::ESNRP_SKY_BOX);
 111
 112         scene::ISceneNode::OnRegisterSceneNode();
 113 }
 114
 115
 116 void Sky::render()
 117 {
 118         if (!m_visible)
 119                 return;
 120
 121         video::IVideoDriver *driver = SceneManager->getVideoDriver();
 122         scene::ICameraSceneNode *camera = SceneManager->getActiveCamera();
 123
 124         if (!camera || !driver)
 125                 return;
 126
 127         ScopeProfiler sp(g_profiler, "Sky::render()", SPT_AVG);
 128
 129         // Draw perspective skybox
 130
 131         core::matrix4 translate(AbsoluteTransformation);
 132         translate.setTranslation(camera->getAbsolutePosition());
 133
 134         // Draw the sky box between the near and far clip plane
 135         const f32 viewDistance = (camera->getNearValue() + camera->getFarValue()) * 0.5f;
 136         core::matrix4 scale;
 137         scale.setScale(core::vector3df(viewDistance, viewDistance, viewDistance));
 138
 139         driver->setTransform(video::ETS_WORLD, translate * scale);
 140
 141         if (m_sunlight_seen) {
 142                 float sunsize = 0.07;
 143                 video::SColorf suncolor_f(1, 1, 0, 1);
 144                 //suncolor_f.r = 1;
 145                 //suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.7 + m_time_brightness * 0.5));
 146                 //suncolor_f.b = MYMAX(0.0, m_brightness * 0.95);
 147                 video::SColorf suncolor2_f(1, 1, 1, 1);
 148                 // The values below were probably meant to be suncolor2_f instead of a
 149                 // reassignment of suncolor_f. However, the resulting colour was chosen
 150                 // and is our long-running classic colour. So preserve, but comment-out
 151                 // the unnecessary first assignments above.
 152                 suncolor_f.r = 1;
 153                 suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.85 + m_time_brightness * 0.5));
 154                 suncolor_f.b = MYMAX(0.0, m_brightness);
 155
 156                 float moonsize = 0.04;
 157                 video::SColorf mooncolor_f(0.50, 0.57, 0.65, 1);
 158                 video::SColorf mooncolor2_f(0.85, 0.875, 0.9, 1);
 159
 160                 float nightlength = 0.415;
 161                 float wn = nightlength / 2;
 162                 float wicked_time_of_day = 0;
 163                 if (m_time_of_day > wn && m_time_of_day < 1.0 - wn)
 164                         wicked_time_of_day = (m_time_of_day - wn) / (1.0 - wn * 2) * 0.5 + 0.25;
 165                 else if (m_time_of_day < 0.5)
 166                         wicked_time_of_day = m_time_of_day / wn * 0.25;
 167                 else
 168                         wicked_time_of_day = 1.0 - ((1.0 - m_time_of_day) / wn * 0.25);
 169                 /*std::cerr<<"time_of_day="<<m_time_of_day<<" -> "
 170                                 <<"wicked_time_of_day="<<wicked_time_of_day<<std::endl;*/
 171
 172                 video::SColor suncolor = suncolor_f.toSColor();
 173                 video::SColor suncolor2 = suncolor2_f.toSColor();
 174                 video::SColor mooncolor = mooncolor_f.toSColor();
 175                 video::SColor mooncolor2 = mooncolor2_f.toSColor();
 176
 177                 // Calculate offset normalized to the X dimension of a 512x1 px tonemap
 178                 float offset = (1.0 - fabs(sin((m_time_of_day - 0.5) * irr::core::PI))) * 511;
 179
 180                 if (m_sun_tonemap) {
 181                         u8 * texels = (u8 *)m_sun_tonemap->lock();
 182                         video::SColor* texel = (video::SColor *)(texels + (u32)offset * 4);
 183                         video::SColor texel_color (255, texel->getRed(),
 184                                 texel->getGreen(), texel->getBlue());
 185                         m_sun_tonemap->unlock();
 186                         m_materials[3].EmissiveColor = texel_color;
 187                 }
 188
 189                 if (m_moon_tonemap) {
 190                         u8 * texels = (u8 *)m_moon_tonemap->lock();
 191                         video::SColor* texel = (video::SColor *)(texels + (u32)offset * 4);
 192                         video::SColor texel_color (255, texel->getRed(),
 193                                 texel->getGreen(), texel->getBlue());
 194                         m_moon_tonemap->unlock();
 195                         m_materials[4].EmissiveColor = texel_color;
 196                 }
 197
 198                 const f32 t = 1.0f;
 199                 const f32 o = 0.0f;
 200                 static const u16 indices[4] = {0, 1, 2, 3};
 201                 video::S3DVertex vertices[4];
 202
 203                 driver->setMaterial(m_materials[1]);
 204
 205                 video::SColor cloudyfogcolor = m_bgcolor;
 206
 207                 // Draw far cloudy fog thing blended with skycolor
 208                 for (u32 j = 0; j < 4; j++) {
 209                         video::SColor c = cloudyfogcolor.getInterpolated(m_skycolor, 0.45);
 210                         vertices[0] = video::S3DVertex(-1, 0.08, -1, 0, 0, 1, c, t, t);
 211                         vertices[1] = video::S3DVertex( 1, 0.08, -1, 0, 0, 1, c, o, t);
 212                         vertices[2] = video::S3DVertex( 1, 0.12, -1, 0, 0, 1, c, o, o);
 213                         vertices[3] = video::S3DVertex(-1, 0.12, -1, 0, 0, 1, c, t, o);
 214                         for (video::S3DVertex &vertex : vertices) {
 215                                 if (j == 0)
 216                                         // Don't switch
 217                                         {}
 218                                 else if (j == 1)
 219                                         // Switch from -Z (south) to +X (east)
 220                                         vertex.Pos.rotateXZBy(90);
 221                                 else if (j == 2)
 222                                         // Switch from -Z (south) to -X (west)
 223                                         vertex.Pos.rotateXZBy(-90);
 224                                 else
 225                                         // Switch from -Z (south) to +Z (north)
 226                                         vertex.Pos.rotateXZBy(-180);
 227                         }
 228                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 229                 }
 230
 231                 // Draw far cloudy fog thing at and below all horizons
 232                 for (u32 j = 0; j < 4; j++) {
 233                         video::SColor c = cloudyfogcolor;
 234                         vertices[0] = video::S3DVertex(-1, -1.0, -1, 0, 0, 1, c, t, t);
 235                         vertices[1] = video::S3DVertex( 1, -1.0, -1, 0, 0, 1, c, o, t);
 236                         vertices[2] = video::S3DVertex( 1, 0.08, -1, 0, 0, 1, c, o, o);
 237                         vertices[3] = video::S3DVertex(-1, 0.08, -1, 0, 0, 1, c, t, o);
 238                         for (video::S3DVertex &vertex : vertices) {
 239                                 if (j == 0)
 240                                         // Don't switch
 241                                         {}
 242                                 else if (j == 1)
 243                                         // Switch from -Z (south) to +X (east)
 244                                         vertex.Pos.rotateXZBy(90);
 245                                 else if (j == 2)
 246                                         // Switch from -Z (south) to -X (west)
 247                                         vertex.Pos.rotateXZBy(-90);
 248                                 else
 249                                         // Switch from -Z (south) to +Z (north)
 250                                         vertex.Pos.rotateXZBy(-180);
 251                         }
 252                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 253                 }
 254
 255                 // If sun, moon and stars are (temporarily) disabled, abort here
 256                 if (!m_bodies_visible)
 257                         return;
 258
 259                 // Draw stars before sun and moon to be behind them
 260                 do {
 261                         driver->setMaterial(m_materials[1]);
 262                         // Tune values so that stars first appear just after the sun
 263                         // disappears over the horizon, and disappear just before the sun
 264                         // appears over the horizon.
 265                         // Also tune so that stars are at full brightness from time 20000 to
 266                         // time 4000.
 267                         float starbrightness = MYMAX(0, MYMIN(1,
 268                                 (0.25 - fabs(wicked_time_of_day < 0.5 ?
 269                                 wicked_time_of_day : (1.0 - wicked_time_of_day))) * 20));
 270                         float f = starbrightness;
 271                         float d = 0.007 / 2;
 272                         video::SColor starcolor(255, f * 90, f * 90, f * 90);
 273                         // Stars are only drawn when brighter than skycolor
 274                         if (starcolor.getBlue() < m_skycolor.getBlue())
 275                                 break;
 276 #ifdef __ANDROID__
 277                         u16 indices[SKY_STAR_COUNT * 3];
 278                         video::S3DVertex vertices[SKY_STAR_COUNT * 3];
 279                         for (u32 i = 0; i < SKY_STAR_COUNT; i++) {
 280                                 indices[i * 3 + 0] = i * 3 + 0;
 281                                 indices[i * 3 + 1] = i * 3 + 1;
 282                                 indices[i * 3 + 2] = i * 3 + 2;
 283                                 v3f r = m_stars[i];
 284                                 core::CMatrix4<f32> a;
 285                                 a.buildRotateFromTo(v3f(0, 1, 0), r);
 286                                 v3f p = v3f(-d, 1, -d);
 287                                 v3f p1 = v3f(d, 1, 0);
 288                                 v3f p2 = v3f(-d, 1, d);
 289                                 a.rotateVect(p);
 290                                 a.rotateVect(p1);
 291                                 a.rotateVect(p2);
 292                                 p.rotateXYBy(wicked_time_of_day * 360 - 90);
 293                                 p1.rotateXYBy(wicked_time_of_day * 360 - 90);
 294                                 p2.rotateXYBy(wicked_time_of_day * 360 - 90);
 295                                 vertices[i * 3 + 0].Pos = p;
 296                                 vertices[i * 3 + 0].Color = starcolor;
 297                                 vertices[i * 3 + 1].Pos = p1;
 298                                 vertices[i * 3 + 1].Color = starcolor;
 299                                 vertices[i * 3 + 2].Pos = p2;
 300                                 vertices[i * 3 + 2].Color = starcolor;
 301                         }
 302                         driver->drawIndexedTriangleList(vertices, SKY_STAR_COUNT * 3,
 303                                         indices, SKY_STAR_COUNT);
 304 #else
 305                         u16 indices[SKY_STAR_COUNT * 4];
 306                         video::S3DVertex vertices[SKY_STAR_COUNT * 4];
 307                         for (u32 i = 0; i < SKY_STAR_COUNT; i++) {
 308                                 indices[i * 4 + 0] = i * 4 + 0;
 309                                 indices[i * 4 + 1] = i * 4 + 1;
 310                                 indices[i * 4 + 2] = i * 4 + 2;
 311                                 indices[i * 4 + 3] = i * 4 + 3;
 312                                 v3f r = m_stars[i];
 313                                 core::CMatrix4<f32> a;
 314                                 a.buildRotateFromTo(v3f(0, 1, 0), r);
 315                                 v3f p = v3f(-d, 1, -d);
 316                                 v3f p1 = v3f( d, 1, -d);
 317                                 v3f p2 = v3f( d, 1, d);
 318                                 v3f p3 = v3f(-d, 1, d);
 319                                 a.rotateVect(p);
 320                                 a.rotateVect(p1);
 321                                 a.rotateVect(p2);
 322                                 a.rotateVect(p3);
 323                                 p.rotateXYBy(wicked_time_of_day * 360 - 90);
 324                                 p1.rotateXYBy(wicked_time_of_day * 360 - 90);
 325                                 p2.rotateXYBy(wicked_time_of_day * 360 - 90);
 326                                 p3.rotateXYBy(wicked_time_of_day * 360 - 90);
 327                                 vertices[i * 4 + 0].Pos = p;
 328                                 vertices[i * 4 + 0].Color = starcolor;
 329                                 vertices[i * 4 + 1].Pos = p1;
 330                                 vertices[i * 4 + 1].Color = starcolor;
 331                                 vertices[i * 4 + 2].Pos = p2;
 332                                 vertices[i * 4 + 2].Color = starcolor;
 333                                 vertices[i * 4 + 3].Pos = p3;
 334                                 vertices[i * 4 + 3].Color = starcolor;
 335                         }
 336                         driver->drawVertexPrimitiveList(vertices, SKY_STAR_COUNT * 4,
 337                                 indices, SKY_STAR_COUNT, video::EVT_STANDARD,
 338                                 scene::EPT_QUADS, video::EIT_16BIT);
 339 #endif
 340                 } while (false);
 341
 342                 // Draw sunrise/sunset horizon glow texture (textures/base/pack/sunrisebg.png)
 343                 {
 344                         driver->setMaterial(m_materials[2]);
 345                         float mid1 = 0.25;
 346                         float mid = wicked_time_of_day < 0.5 ? mid1 : (1.0 - mid1);
 347                         float a_ = 1.0f - std::fabs(wicked_time_of_day - mid) * 35.0f;
 348                         float a = easeCurve(MYMAX(0, MYMIN(1, a_)));
 349                         //std::cerr<<"a_="<<a_<<" a="<<a<<std::endl;
 350                         video::SColor c(255, 255, 255, 255);
 351                         float y = -(1.0 - a) * 0.22;
 352                         vertices[0] = video::S3DVertex(-1, -0.05 + y, -1, 0, 0, 1, c, t, t);
 353                         vertices[1] = video::S3DVertex( 1, -0.05 + y, -1, 0, 0, 1, c, o, t);
 354                         vertices[2] = video::S3DVertex( 1,   0.2 + y, -1, 0, 0, 1, c, o, o);
 355                         vertices[3] = video::S3DVertex(-1,   0.2 + y, -1, 0, 0, 1, c, t, o);
 356                         for (video::S3DVertex &vertex : vertices) {
 357                                 if (wicked_time_of_day < 0.5)
 358                                         // Switch from -Z (south) to +X (east)
 359                                         vertex.Pos.rotateXZBy(90);
 360                                 else
 361                                         // Switch from -Z (south) to -X (west)
 362                                         vertex.Pos.rotateXZBy(-90);
 363                         }
 364                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 365                 }
 366
 367                 // Draw sun
 368                 if (wicked_time_of_day > 0.15 && wicked_time_of_day < 0.85) {
 369                         draw_sun(driver, sunsize, suncolor, suncolor2, wicked_time_of_day);
 370                 }
 371
 372                 // Draw moon
 373                 if (wicked_time_of_day < 0.3 || wicked_time_of_day > 0.7) {
 374                         draw_moon(driver, moonsize, mooncolor, mooncolor2, wicked_time_of_day);
 375                 }
 376
 377                 // Draw far cloudy fog thing below all horizons in front of sun, moon
 378                 // and stars.
 379                 driver->setMaterial(m_materials[1]);
 380
 381                 for (u32 j = 0; j < 4; j++) {
 382                         video::SColor c = cloudyfogcolor;
 383                         vertices[0] = video::S3DVertex(-1, -1.0,  -1, 0, 0, 1, c, t, t);
 384                         vertices[1] = video::S3DVertex( 1, -1.0,  -1, 0, 0, 1, c, o, t);
 385                         vertices[2] = video::S3DVertex( 1, -0.02, -1, 0, 0, 1, c, o, o);
 386                         vertices[3] = video::S3DVertex(-1, -0.02, -1, 0, 0, 1, c, t, o);
 387                         for (video::S3DVertex &vertex : vertices) {
 388                                 if (j == 0)
 389                                         // Don't switch
 390                                         {}
 391                                 else if (j == 1)
 392                                         // Switch from -Z (south) to +X (east)
 393                                         vertex.Pos.rotateXZBy(90);
 394                                 else if (j == 2)
 395                                         // Switch from -Z (south) to -X (west)
 396                                         vertex.Pos.rotateXZBy(-90);
 397                                 else
 398                                         // Switch from -Z (south) to +Z (north)
 399                                         vertex.Pos.rotateXZBy(-180);
 400                         }
 401                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 402                 }
 403
 404                 // Draw bottom far cloudy fog thing in front of sun, moon and stars
 405                 video::SColor c = cloudyfogcolor;
 406                 vertices[0] = video::S3DVertex(-1, -1.0, -1, 0, 1, 0, c, t, t);
 407                 vertices[1] = video::S3DVertex( 1, -1.0, -1, 0, 1, 0, c, o, t);
 408                 vertices[2] = video::S3DVertex( 1, -1.0, 1, 0, 1, 0, c, o, o);
 409                 vertices[3] = video::S3DVertex(-1, -1.0, 1, 0, 1, 0, c, t, o);
 410                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 411         }
 412 }
 413
 414
 415 void Sky::update(float time_of_day, float time_brightness,
 416         float direct_brightness, bool sunlight_seen,
 417         CameraMode cam_mode, float yaw, float pitch)
 418 {
 419         // Stabilize initial brightness and color values by flooding updates
 420         if (m_first_update) {
 421                 /*dstream<<"First update with time_of_day="<<time_of_day
 422                                 <<" time_brightness="<<time_brightness
 423                                 <<" direct_brightness="<<direct_brightness
 424                                 <<" sunlight_seen="<<sunlight_seen<<std::endl;*/
 425                 m_first_update = false;
 426                 for (u32 i = 0; i < 100; i++) {
 427                         update(time_of_day, time_brightness, direct_brightness,
 428                                 sunlight_seen, cam_mode, yaw, pitch);
 429                 }
 430                 return;
 431         }
 432
 433         m_time_of_day = time_of_day;
 434         m_time_brightness = time_brightness;
 435         m_sunlight_seen = sunlight_seen;
 436         m_bodies_visible = true;
 437
 438         bool is_dawn = (time_brightness >= 0.20 && time_brightness < 0.35);
 439
 440         /*
 441         Development colours
 442
 443         video::SColorf bgcolor_bright_normal_f(170. / 255, 200. / 255, 230. / 255, 1.0);
 444         video::SColorf bgcolor_bright_dawn_f(0.666, 200. / 255 * 0.7, 230. / 255 * 0.5, 1.0);
 445         video::SColorf bgcolor_bright_dawn_f(0.666, 0.549, 0.220, 1.0);
 446         video::SColorf bgcolor_bright_dawn_f(0.666 * 1.2, 0.549 * 1.0, 0.220 * 1.0, 1.0);
 447         video::SColorf bgcolor_bright_dawn_f(0.666 * 1.2, 0.549 * 1.0, 0.220 * 1.2, 1.0);
 448
 449         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.591, 0.4);
 450         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.65, 0.44);
 451         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.7, 0.5);
 452         */
 453
 454         video::SColorf bgcolor_bright_normal_f = video::SColor(255, 155, 193, 240);
 455         video::SColorf bgcolor_bright_indoor_f = video::SColor(255, 100, 100, 100);
 456         video::SColorf bgcolor_bright_dawn_f = video::SColor(255, 186, 193, 240);
 457         video::SColorf bgcolor_bright_night_f = video::SColor(255, 64, 144, 255);
 458
 459         video::SColorf skycolor_bright_normal_f = video::SColor(255, 140, 186, 250);
 460         video::SColorf skycolor_bright_dawn_f = video::SColor(255, 180, 186, 250);
 461         video::SColorf skycolor_bright_night_f = video::SColor(255, 0, 107, 255);
 462
 463         // pure white: becomes "diffuse light component" for clouds
 464         video::SColorf cloudcolor_bright_normal_f = video::SColor(255, 255, 255, 255);
 465         // dawn-factoring version of pure white (note: R is above 1.0)
 466         video::SColorf cloudcolor_bright_dawn_f(255.0f/240.0f, 223.0f/240.0f, 191.0f/255.0f);
 467
 468         float cloud_color_change_fraction = 0.95;
 469         if (sunlight_seen) {
 470                 if (std::fabs(time_brightness - m_brightness) < 0.2f) {
 471                         m_brightness = m_brightness * 0.95 + time_brightness * 0.05;
 472                 } else {
 473                         m_brightness = m_brightness * 0.80 + time_brightness * 0.20;
 474                         cloud_color_change_fraction = 0.0;
 475                 }
 476         } else {
 477                 if (direct_brightness < m_brightness)
 478                         m_brightness = m_brightness * 0.95 + direct_brightness * 0.05;
 479                 else
 480                         m_brightness = m_brightness * 0.98 + direct_brightness * 0.02;
 481         }
 482
 483         m_clouds_visible = true;
 484         float color_change_fraction = 0.98f;
 485         if (sunlight_seen) {
 486                 if (is_dawn) { // Dawn
 487                         m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 488                                 bgcolor_bright_dawn_f, color_change_fraction);
 489                         m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 490                                 skycolor_bright_dawn_f, color_change_fraction);
 491                         m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 492                                 cloudcolor_bright_dawn_f, color_change_fraction);
 493                 } else {
 494                         if (time_brightness < 0.13f) { // Night
 495                                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 496                                         bgcolor_bright_night_f, color_change_fraction);
 497                                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 498                                         skycolor_bright_night_f, color_change_fraction);
 499                         } else { // Day
 500                                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 501                                         bgcolor_bright_normal_f, color_change_fraction);
 502                                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 503                                         skycolor_bright_normal_f, color_change_fraction);
 504                         }
 505
 506                         m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 507                                 cloudcolor_bright_normal_f, color_change_fraction);
 508                 }
 509         } else {
 510                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 511                         bgcolor_bright_indoor_f, color_change_fraction);
 512                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 513                         bgcolor_bright_indoor_f, color_change_fraction);
 514                 m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 515                         cloudcolor_bright_normal_f, color_change_fraction);
 516                 m_clouds_visible = false;
 517         }
 518
 519         video::SColor bgcolor_bright = m_bgcolor_bright_f.toSColor();
 520         m_bgcolor = video::SColor(
 521                 255,
 522                 bgcolor_bright.getRed() * m_brightness,
 523                 bgcolor_bright.getGreen() * m_brightness,
 524                 bgcolor_bright.getBlue() * m_brightness
 525         );
 526
 527         video::SColor skycolor_bright = m_skycolor_bright_f.toSColor();
 528         m_skycolor = video::SColor(
 529                 255,
 530                 skycolor_bright.getRed() * m_brightness,
 531                 skycolor_bright.getGreen() * m_brightness,
 532                 skycolor_bright.getBlue() * m_brightness
 533         );
 534
 535         // Horizon coloring based on sun and moon direction during sunset and sunrise
 536         video::SColor pointcolor = video::SColor(m_bgcolor.getAlpha(), 255, 255, 255);
 537         if (m_directional_colored_fog) {
 538                 if (m_horizon_blend() != 0) {
 539                         // Calculate hemisphere value from yaw, (inverted in third person front view)
 540                         s8 dir_factor = 1;
 541                         if (cam_mode > CAMERA_MODE_THIRD)
 542                                 dir_factor = -1;
 543                         f32 pointcolor_blend = wrapDegrees_0_360(yaw * dir_factor + 90);
 544                         if (pointcolor_blend > 180)
 545                                 pointcolor_blend = 360 - pointcolor_blend;
 546                         pointcolor_blend /= 180;
 547                         // Bound view angle to determine where transition starts and ends
 548                         pointcolor_blend = rangelim(1 - pointcolor_blend * 1.375, 0, 1 / 1.375) *
 549                                 1.375;
 550                         // Combine the colors when looking up or down, otherwise turning looks weird
 551                         pointcolor_blend += (0.5 - pointcolor_blend) *
 552                                 (1 - MYMIN((90 - std::fabs(pitch)) / 90 * 1.5, 1));
 553                         // Invert direction to match where the sun and moon are rising
 554                         if (m_time_of_day > 0.5)
 555                                 pointcolor_blend = 1 - pointcolor_blend;
 556                         // Horizon colors of sun and moon
 557                         f32 pointcolor_light = rangelim(m_time_brightness * 3, 0.2, 1);
 558
 559                         video::SColorf pointcolor_sun_f(1, 1, 1, 1);
 560                         if (m_sun_tonemap) {
 561                                 pointcolor_sun_f.r = pointcolor_light *
 562                                         (float)m_materials[3].EmissiveColor.getRed() / 255;
 563                                 pointcolor_sun_f.b = pointcolor_light *
 564                                         (float)m_materials[3].EmissiveColor.getBlue() / 255;
 565                                 pointcolor_sun_f.g = pointcolor_light *
 566                                         (float)m_materials[3].EmissiveColor.getGreen() / 255;
 567                         } else {
 568                                 pointcolor_sun_f.r = pointcolor_light * 1;
 569                                 pointcolor_sun_f.b = pointcolor_light *
 570                                         (0.25 + (rangelim(m_time_brightness, 0.25, 0.75) - 0.25) * 2 * 0.75);
 571                                 pointcolor_sun_f.g = pointcolor_light * (pointcolor_sun_f.b * 0.375 +
 572                                         (rangelim(m_time_brightness, 0.05, 0.15) - 0.05) * 10 * 0.625);
 573                         }
 574
 575                         video::SColorf pointcolor_moon_f(0.5 * pointcolor_light,
 576                                 0.6 * pointcolor_light, 0.8 * pointcolor_light, 1);
 577                         if (m_moon_tonemap) {
 578                                 pointcolor_moon_f.r = pointcolor_light *
 579                                         (float)m_materials[4].EmissiveColor.getRed() / 255;
 580                                 pointcolor_moon_f.b = pointcolor_light *
 581                                         (float)m_materials[4].EmissiveColor.getBlue() / 255;
 582                                 pointcolor_moon_f.g = pointcolor_light *
 583                                         (float)m_materials[4].EmissiveColor.getGreen() / 255;
 584                         }
 585
 586                         video::SColor pointcolor_sun = pointcolor_sun_f.toSColor();
 587                         video::SColor pointcolor_moon = pointcolor_moon_f.toSColor();
 588                         // Calculate the blend color
 589                         pointcolor = m_mix_scolor(pointcolor_moon, pointcolor_sun, pointcolor_blend);
 590                 }
 591                 m_bgcolor = m_mix_scolor(m_bgcolor, pointcolor, m_horizon_blend() * 0.5);
 592                 m_skycolor = m_mix_scolor(m_skycolor, pointcolor, m_horizon_blend() * 0.25);
 593         }
 594
 595         float cloud_direct_brightness = 0.0f;
 596         if (sunlight_seen) {
 597                 if (!m_directional_colored_fog) {
 598                         cloud_direct_brightness = time_brightness;
 599                         // Boost cloud brightness relative to sky, at dawn, dusk and at night
 600                         if (time_brightness < 0.7f)
 601                                 cloud_direct_brightness *= 1.3f;
 602                 } else {
 603                         cloud_direct_brightness = std::fmin(m_horizon_blend() * 0.15f +
 604                                 m_time_brightness, 1.0f);
 605                         // Set the same minimum cloud brightness at night
 606                         if (time_brightness < 0.5f)
 607                                 cloud_direct_brightness = std::fmax(cloud_direct_brightness,
 608                                         time_brightness * 1.3f);
 609                 }
 610         } else {
 611                 cloud_direct_brightness = direct_brightness;
 612         }
 613
 614         m_cloud_brightness = m_cloud_brightness * cloud_color_change_fraction +
 615                 cloud_direct_brightness * (1.0 - cloud_color_change_fraction);
 616         m_cloudcolor_f = video::SColorf(
 617                 m_cloudcolor_bright_f.r * m_cloud_brightness,
 618                 m_cloudcolor_bright_f.g * m_cloud_brightness,
 619                 m_cloudcolor_bright_f.b * m_cloud_brightness,
 620                 1.0
 621         );
 622         if (m_directional_colored_fog) {
 623                 m_cloudcolor_f = m_mix_scolorf(m_cloudcolor_f,
 624                         video::SColorf(pointcolor), m_horizon_blend() * 0.25);
 625         }
 626 }
 627
 628 void Sky::draw_sun(video::IVideoDriver *driver, float sunsize, const video::SColor &suncolor,
 629         const video::SColor &suncolor2, float wicked_time_of_day)
 630         /* Draw sun in the sky.
 631          * driver: Video driver object used to draw
 632          * sunsize: the default size of the sun
 633          * suncolor: main sun color
 634          * suncolor2: second sun color
 635          * wicked_time_of_day: current time of day, to know where should be the sun in the sky
 636          */
 637 {
 638         static const u16 indices[4] = {0, 1, 2, 3};
 639         std::array<video::S3DVertex, 4> vertices;
 640         if (!m_sun_texture) {
 641                 driver->setMaterial(m_materials[1]);
 642                 const float sunsizes[4] = {sunsize * 1.7f, sunsize * 1.2f, sunsize, sunsize * 0.7f};
 643                 video::SColor c1 = suncolor;
 644                 video::SColor c2 = suncolor;
 645                 c1.setAlpha(0.05 * 255);
 646                 c2.setAlpha(0.15 * 255);
 647                 const video::SColor colors[4] = {c1, c2, suncolor, suncolor2};
 648                 for (int i = 0; i < 4; i++) {
 649                         draw_sky_body(vertices, -sunsizes[i], sunsizes[i], colors[i]);
 650                         place_sky_body(vertices, 90, wicked_time_of_day * 360 - 90);
 651                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 652                 }
 653         } else {
 654                 driver->setMaterial(m_materials[3]);
 655                 float d = sunsize * 1.7;
 656                 video::SColor c;
 657                 if (m_sun_tonemap)
 658                         c = video::SColor(0, 0, 0, 0);
 659                 else
 660                         c = video::SColor(255, 255, 255, 255);
 661                 draw_sky_body(vertices, -d, d, c);
 662                 place_sky_body(vertices, 90, wicked_time_of_day * 360 - 90);
 663                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 664         }
 665 }
 666
 667
 668 void Sky::draw_moon(video::IVideoDriver *driver, float moonsize, const video::SColor &mooncolor,
 669         const video::SColor &mooncolor2, float wicked_time_of_day)
 670         /*
 671          * Draw moon in the sky.
 672          * driver: Video driver object used to draw
 673          * moonsize: the default size of the moon
 674          * mooncolor: main moon color
 675          * mooncolor2: second moon color
 676          * wicked_time_of_day: current time of day, to know where should be the moon in the sky
 677          */
 678 {
 679         static const u16 indices[4] = {0, 1, 2, 3};
 680         std::array<video::S3DVertex, 4> vertices;
 681         if (!m_moon_texture) {
 682                 driver->setMaterial(m_materials[1]);
 683                 const float moonsizes_1[4] = {
 684                                 -moonsize * 1.9f,
 685                                 -moonsize * 1.3f,
 686                                 -moonsize,
 687                                 -moonsize
 688                         };
 689                 const float moonsizes_2[4] = {
 690                                 moonsize * 1.9f,
 691                                 moonsize * 1.3f,
 692                                 moonsize,
 693                                 moonsize * 0.6f
 694                         };
 695                 video::SColor c1 = mooncolor;
 696                 video::SColor c2 = mooncolor;
 697                 c1.setAlpha(0.05 * 255);
 698                 c2.setAlpha(0.15 * 255);
 699                 const video::SColor colors[4] = {c1, c2, mooncolor, mooncolor2};
 700                 for (int i = 0; i < 4; i++) {
 701                         draw_sky_body(vertices, moonsizes_1[i], moonsizes_2[i], colors[i]);
 702                         place_sky_body(vertices, -90, wicked_time_of_day * 360 - 90);
 703                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 704                 }
 705         } else {
 706                 driver->setMaterial(m_materials[4]);
 707                 float d = moonsize * 1.9;
 708                 video::SColor c;
 709                 if (m_moon_tonemap)
 710                         c = video::SColor(0, 0, 0, 0);
 711                 else
 712                         c = video::SColor(255, 255, 255, 255);
 713                 draw_sky_body(vertices, -d, d, c);
 714                 place_sky_body(vertices, -90, wicked_time_of_day * 360 - 90);
 715                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 716         }
 717 }
 718
 719
 720 void Sky::draw_sky_body(std::array<video::S3DVertex, 4> &vertices, float pos_1, float pos_2, const video::SColor &c)
 721 {
 722         /*
 723          * Create an array of vertices with the dimensions specified.
 724          * pos_1, pos_2: position of the body's vertices
 725          * c: color of the body
 726          */
 727
 728         const f32 t = 1.0f;
 729         const f32 o = 0.0f;
 730         vertices[0] = video::S3DVertex(pos_1, pos_1, -1, 0, 0, 1, c, t, t);
 731         vertices[1] = video::S3DVertex(pos_2, pos_1, -1, 0, 0, 1, c, o, t);
 732         vertices[2] = video::S3DVertex(pos_2, pos_2, -1, 0, 0, 1, c, o, o);
 733         vertices[3] = video::S3DVertex(pos_1, pos_2, -1, 0, 0, 1, c, t, o);
 734 }
 735
 736
 737 void Sky::place_sky_body(
 738         std::array<video::S3DVertex, 4> &vertices, float horizon_position, float day_position)
 739         /*
 740          * Place body in the sky.
 741          * vertices: The body as a rectangle of 4 vertices
 742          * horizon_position: turn the body around the Y axis
 743          * day_position: turn the body around the Z axis, to place it depending of the time of the day
 744          */
 745 {
 746         for (video::S3DVertex &vertex : vertices) {
 747                 // Body is directed to -Z (south) by default
 748                 vertex.Pos.rotateXZBy(horizon_position);
 749                 vertex.Pos.rotateXYBy(day_position);
 750         }
 751 }