src/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         mat.ZBuffer = video::ECFN_NEVER;
  48         mat.ZWriteEnable = false;
  49         mat.AntiAliasing = 0;
  50         mat.TextureLayer[0].TextureWrapU = video::ETC_CLAMP_TO_EDGE;
  51         mat.TextureLayer[0].TextureWrapV = video::ETC_CLAMP_TO_EDGE;
  52         mat.BackfaceCulling = false;
  53
  54         m_materials[0] = mat;
  55
  56         m_materials[1] = mat;
  57         //m_materials[1].MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  58         m_materials[1].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  59
  60         m_materials[2] = mat;
  61         m_materials[2].setTexture(0, tsrc->getTextureForMesh("sunrisebg.png"));
  62         m_materials[2].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  63         //m_materials[2].MaterialType = video::EMT_TRANSPARENT_ADD_COLOR;
  64
  65         m_sun_texture = tsrc->isKnownSourceImage("sun.png") ?
  66                 tsrc->getTextureForMesh("sun.png") : NULL;
  67         m_moon_texture = tsrc->isKnownSourceImage("moon.png") ?
  68                 tsrc->getTextureForMesh("moon.png") : NULL;
  69         m_sun_tonemap = tsrc->isKnownSourceImage("sun_tonemap.png") ?
  70                 tsrc->getTexture("sun_tonemap.png") : NULL;
  71         m_moon_tonemap = tsrc->isKnownSourceImage("moon_tonemap.png") ?
  72                 tsrc->getTexture("moon_tonemap.png") : NULL;
  73
  74         if (m_sun_texture) {
  75                 m_materials[3] = mat;
  76                 m_materials[3].setTexture(0, m_sun_texture);
  77                 m_materials[3].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  78                 if (m_sun_tonemap)
  79                         m_materials[3].Lighting = true;
  80         }
  81
  82         if (m_moon_texture) {
  83                 m_materials[4] = mat;
  84                 m_materials[4].setTexture(0, m_moon_texture);
  85                 m_materials[4].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  86                 if (m_moon_tonemap)
  87                         m_materials[4].Lighting = true;
  88         }
  89
  90         for (v3f &star : m_stars) {
  91                 star = v3f(
  92                         myrand_range(-10000, 10000),
  93                         myrand_range(-10000, 10000),
  94                         myrand_range(-10000, 10000)
  95                 );
  96                 star.normalize();
  97         }
  98
  99         m_directional_colored_fog = g_settings->getBool("directional_colored_fog");
 100 }
 101
 102
 103 void Sky::OnRegisterSceneNode()
 104 {
 105         if (IsVisible)
 106                 SceneManager->registerNodeForRendering(this, scene::ESNRP_SKY_BOX);
 107
 108         scene::ISceneNode::OnRegisterSceneNode();
 109 }
 110
 111
 112 void Sky::render()
 113 {
 114         if (!m_visible)
 115                 return;
 116
 117         video::IVideoDriver* driver = SceneManager->getVideoDriver();
 118         scene::ICameraSceneNode* camera = SceneManager->getActiveCamera();
 119
 120         if (!camera || !driver)
 121                 return;
 122
 123         ScopeProfiler sp(g_profiler, "Sky::render()", SPT_AVG);
 124
 125         // Draw perspective skybox
 126
 127         core::matrix4 translate(AbsoluteTransformation);
 128         translate.setTranslation(camera->getAbsolutePosition());
 129
 130         // Draw the sky box between the near and far clip plane
 131         const f32 viewDistance = (camera->getNearValue() + camera->getFarValue()) * 0.5f;
 132         core::matrix4 scale;
 133         scale.setScale(core::vector3df(viewDistance, viewDistance, viewDistance));
 134
 135         driver->setTransform(video::ETS_WORLD, translate * scale);
 136
 137         if (m_sunlight_seen) {
 138                 float sunsize = 0.07;
 139                 video::SColorf suncolor_f(1, 1, 0, 1);
 140                 suncolor_f.r = 1;
 141                 suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.7 + m_time_brightness * 0.5));
 142                 suncolor_f.b = MYMAX(0.0, m_brightness * 0.95);
 143                 video::SColorf suncolor2_f(1, 1, 1, 1);
 144                 suncolor2_f.r = 1;
 145                 suncolor2_f.g = MYMAX(0.3, MYMIN(1.0, 0.85 + m_time_brightness * 0.5));
 146                 suncolor2_f.b = MYMAX(0.0, m_brightness);
 147
 148                 float moonsize = 0.04;
 149                 video::SColorf mooncolor_f(0.50, 0.57, 0.65, 1);
 150                 video::SColorf mooncolor2_f(0.85, 0.875, 0.9, 1);
 151
 152                 float nightlength = 0.415;
 153                 float wn = nightlength / 2;
 154                 float wicked_time_of_day = 0;
 155                 if (m_time_of_day > wn && m_time_of_day < 1.0 - wn)
 156                         wicked_time_of_day = (m_time_of_day - wn) / (1.0 - wn * 2) * 0.5 + 0.25;
 157                 else if (m_time_of_day < 0.5)
 158                         wicked_time_of_day = m_time_of_day / wn * 0.25;
 159                 else
 160                         wicked_time_of_day = 1.0 - ((1.0 - m_time_of_day) / wn * 0.25);
 161                 /*std::cerr<<"time_of_day="<<m_time_of_day<<" -> "
 162                                 <<"wicked_time_of_day="<<wicked_time_of_day<<std::endl;*/
 163
 164                 video::SColor suncolor = suncolor_f.toSColor();
 165                 video::SColor suncolor2 = suncolor2_f.toSColor();
 166                 video::SColor mooncolor = mooncolor_f.toSColor();
 167                 video::SColor mooncolor2 = mooncolor2_f.toSColor();
 168
 169                 // Calculate offset normalized to the X dimension of a 512x1 px tonemap
 170                 float offset = (1.0 - fabs(sin((m_time_of_day - 0.5) * irr::core::PI))) * 511;
 171
 172                 if (m_sun_tonemap) {
 173                         u8 * texels = (u8 *)m_sun_tonemap->lock();
 174                         video::SColor* texel = (video::SColor *)(texels + (u32)offset * 4);
 175                         video::SColor texel_color (255, texel->getRed(),
 176                                 texel->getGreen(), texel->getBlue());
 177                         m_sun_tonemap->unlock();
 178                         m_materials[3].EmissiveColor = texel_color;
 179                 }
 180
 181                 if (m_moon_tonemap) {
 182                         u8 * texels = (u8 *)m_moon_tonemap->lock();
 183                         video::SColor* texel = (video::SColor *)(texels + (u32)offset * 4);
 184                         video::SColor texel_color (255, texel->getRed(),
 185                                 texel->getGreen(), texel->getBlue());
 186                         m_moon_tonemap->unlock();
 187                         m_materials[4].EmissiveColor = texel_color;
 188                 }
 189
 190                 const f32 t = 1.0f;
 191                 const f32 o = 0.0f;
 192                 static const u16 indices[4] = {0, 1, 2, 3};
 193                 video::S3DVertex vertices[4];
 194
 195                 driver->setMaterial(m_materials[1]);
 196
 197                 video::SColor cloudyfogcolor = m_bgcolor;
 198
 199                 // Draw far cloudy fog thing blended with skycolor
 200                 for (u32 j = 0; j < 4; j++) {
 201                         video::SColor c = cloudyfogcolor.getInterpolated(m_skycolor, 0.45);
 202                         vertices[0] = video::S3DVertex(-1, 0.08, -1, 0, 0, 1, c, t, t);
 203                         vertices[1] = video::S3DVertex( 1, 0.08, -1, 0, 0, 1, c, o, t);
 204                         vertices[2] = video::S3DVertex( 1, 0.12, -1, 0, 0, 1, c, o, o);
 205                         vertices[3] = video::S3DVertex(-1, 0.12, -1, 0, 0, 1, c, t, o);
 206                         for (video::S3DVertex &vertex : vertices) {
 207                                 if (j == 0)
 208                                         // Don't switch
 209                                         {}
 210                                 else if (j == 1)
 211                                         // Switch from -Z (south) to +X (east)
 212                                         vertex.Pos.rotateXZBy(90);
 213                                 else if (j == 2)
 214                                         // Switch from -Z (south) to -X (west)
 215                                         vertex.Pos.rotateXZBy(-90);
 216                                 else
 217                                         // Switch from -Z (south) to +Z (north)
 218                                         vertex.Pos.rotateXZBy(-180);
 219                         }
 220                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 221                 }
 222
 223                 // Draw far cloudy fog thing
 224                 for (u32 j = 0; j < 4; j++) {
 225                         video::SColor c = cloudyfogcolor;
 226                         vertices[0] = video::S3DVertex(-1, -1.0, -1, 0, 0, 1, c, t, t);
 227                         vertices[1] = video::S3DVertex( 1, -1.0, -1, 0, 0, 1, c, o, t);
 228                         vertices[2] = video::S3DVertex( 1, 0.08, -1, 0, 0, 1, c, o, o);
 229                         vertices[3] = video::S3DVertex(-1, 0.08, -1, 0, 0, 1, c, t, o);
 230                         for (video::S3DVertex &vertex : vertices) {
 231                                 if (j == 0)
 232                                         // Don't switch
 233                                         {}
 234                                 else if (j == 1)
 235                                         // Switch from -Z (south) to +X (east)
 236                                         vertex.Pos.rotateXZBy(90);
 237                                 else if (j == 2)
 238                                         // Switch from -Z (south) to -X (west)
 239                                         vertex.Pos.rotateXZBy(-90);
 240                                 else
 241                                         // Switch from -Z (south) to +Z (north)
 242                                         vertex.Pos.rotateXZBy(-180);
 243                         }
 244                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 245                 }
 246
 247                 // Draw bottom far cloudy fog thing
 248                 video::SColor c = cloudyfogcolor;
 249                 vertices[0] = video::S3DVertex(-1, -1.0, -1, 0, 1, 0, c, t, t);
 250                 vertices[1] = video::S3DVertex( 1, -1.0, -1, 0, 1, 0, c, o, t);
 251                 vertices[2] = video::S3DVertex( 1, -1.0, 1, 0, 1, 0, c, o, o);
 252                 vertices[3] = video::S3DVertex(-1, -1.0, 1, 0, 1, 0, c, t, o);
 253                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 254
 255                 // If sun, moon and stars are (temporarily) disabled, abort here
 256                 if (!m_bodies_visible)
 257                         return;
 258
 259                 driver->setMaterial(m_materials[2]);
 260
 261                 // Draw sunrise/sunset horizon glow texture (textures/base/pack/sunrisebg.png)
 262                 {
 263                         float mid1 = 0.25;
 264                         float mid = wicked_time_of_day < 0.5 ? mid1 : (1.0 - mid1);
 265                         float a_ = 1.0f - std::fabs(wicked_time_of_day - mid) * 35.0f;
 266                         float a = easeCurve(MYMAX(0, MYMIN(1, a_)));
 267                         //std::cerr<<"a_="<<a_<<" a="<<a<<std::endl;
 268                         video::SColor c(255, 255, 255, 255);
 269                         float y = -(1.0 - a) * 0.22;
 270                         vertices[0] = video::S3DVertex(-1, -0.05 + y, -1, 0, 0, 1, c, t, t);
 271                         vertices[1] = video::S3DVertex( 1, -0.05 + y, -1, 0, 0, 1, c, o, t);
 272                         vertices[2] = video::S3DVertex( 1,   0.2 + y, -1, 0, 0, 1, c, o, o);
 273                         vertices[3] = video::S3DVertex(-1,   0.2 + y, -1, 0, 0, 1, c, t, o);
 274                         for (video::S3DVertex &vertex : vertices) {
 275                                 if (wicked_time_of_day < 0.5)
 276                                         // Switch from -Z (south) to +X (east)
 277                                         vertex.Pos.rotateXZBy(90);
 278                                 else
 279                                         // Switch from -Z (south) to -X (west)
 280                                         vertex.Pos.rotateXZBy(-90);
 281                         }
 282                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 283                 }
 284
 285                 // Draw sun
 286                 if (wicked_time_of_day > 0.15 && wicked_time_of_day < 0.85) {
 287                         if (!m_sun_texture) {
 288                                 driver->setMaterial(m_materials[1]);
 289                                 float d = sunsize * 1.7;
 290                                 video::SColor c = suncolor;
 291                                 c.setAlpha(0.05 * 255);
 292                                 vertices[0] = video::S3DVertex(-d, -d, -1, 0, 0, 1, c, t, t);
 293                                 vertices[1] = video::S3DVertex( d, -d, -1, 0, 0, 1, c, o, t);
 294                                 vertices[2] = video::S3DVertex( d,  d, -1, 0, 0, 1, c, o, o);
 295                                 vertices[3] = video::S3DVertex(-d,  d, -1, 0, 0, 1, c, t, o);
 296                                 for (video::S3DVertex &vertex : vertices) {
 297                                         // Switch from -Z (south) to +X (east)
 298                                         vertex.Pos.rotateXZBy(90);
 299                                         vertex.Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
 300                                 }
 301                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 302
 303                                 d = sunsize * 1.2;
 304                                 c = suncolor;
 305                                 c.setAlpha(0.15 * 255);
 306                                 vertices[0] = video::S3DVertex(-d, -d, -1, 0, 0, 1, c, t, t);
 307                                 vertices[1] = video::S3DVertex( d, -d, -1, 0, 0, 1, c, o, t);
 308                                 vertices[2] = video::S3DVertex( d,  d, -1, 0, 0, 1, c, o, o);
 309                                 vertices[3] = video::S3DVertex(-d,  d, -1, 0, 0, 1, c, t, o);
 310                                 for (video::S3DVertex &vertex : vertices) {
 311                                         // Switch from -Z (south) to +X (east)
 312                                         vertex.Pos.rotateXZBy(90);
 313                                         vertex.Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
 314                                 }
 315                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 316
 317                                 d = sunsize;
 318                                 vertices[0] = video::S3DVertex(-d, -d, -1, 0, 0, 1, suncolor, t, t);
 319                                 vertices[1] = video::S3DVertex( d, -d, -1, 0, 0, 1, suncolor, o, t);
 320                                 vertices[2] = video::S3DVertex( d,  d, -1, 0, 0, 1, suncolor, o, o);
 321                                 vertices[3] = video::S3DVertex(-d,  d, -1, 0, 0, 1, suncolor, t, o);
 322                                 for (video::S3DVertex &vertex : vertices) {
 323                                         // Switch from -Z (south) to +X (east)
 324                                         vertex.Pos.rotateXZBy(90);
 325                                         vertex.Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
 326                                 }
 327                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 328
 329                                 d = sunsize * 0.7;
 330                                 vertices[0] = video::S3DVertex(-d, -d, -1, 0, 0, 1, suncolor2, t, t);
 331                                 vertices[1] = video::S3DVertex( d, -d, -1, 0, 0, 1, suncolor2, o, t);
 332                                 vertices[2] = video::S3DVertex( d,  d, -1, 0, 0, 1, suncolor2, o, o);
 333                                 vertices[3] = video::S3DVertex(-d,  d, -1, 0, 0, 1, suncolor2, t, o);
 334                                 for (video::S3DVertex &vertex : vertices) {
 335                                         // Switch from -Z (south) to +X (east)
 336                                         vertex.Pos.rotateXZBy(90);
 337                                         vertex.Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
 338                                 }
 339                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 340                         } else {
 341                                 driver->setMaterial(m_materials[3]);
 342                                 float d = sunsize * 1.7;
 343                                 video::SColor c;
 344                                 if (m_sun_tonemap)
 345                                         c = video::SColor (0, 0, 0, 0);
 346                                 else
 347                                         c = video::SColor (255, 255, 255, 255);
 348                                 vertices[0] = video::S3DVertex(-d, -d, -1, 0, 0, 1, c, t, t);
 349                                 vertices[1] = video::S3DVertex( d, -d, -1, 0, 0, 1, c, o, t);
 350                                 vertices[2] = video::S3DVertex( d,  d, -1, 0, 0, 1, c, o, o);
 351                                 vertices[3] = video::S3DVertex(-d,  d, -1, 0, 0, 1, c, t, o);
 352                                 for (video::S3DVertex &vertex : vertices) {
 353                                         // Switch from -Z (south) to +X (east)
 354                                         vertex.Pos.rotateXZBy(90);
 355                                         vertex.Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
 356                                 }
 357                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 358                         }
 359                 }
 360
 361                 // Draw moon
 362                 if (wicked_time_of_day < 0.3 || wicked_time_of_day > 0.7) {
 363                         if (!m_moon_texture) {
 364                                 driver->setMaterial(m_materials[1]);
 365                                 float d = moonsize * 1.9;
 366                                 video::SColor c = mooncolor;
 367                                 c.setAlpha(0.05 * 255);
 368                                 vertices[0] = video::S3DVertex(-d, -d, -1, 0, 0, 1, c, t, t);
 369                                 vertices[1] = video::S3DVertex( d, -d, -1, 0, 0, 1, c, o, t);
 370                                 vertices[2] = video::S3DVertex( d,  d, -1, 0, 0, 1, c, o, o);
 371                                 vertices[3] = video::S3DVertex(-d,  d, -1, 0, 0, 1, c, t, o);
 372                                 for (video::S3DVertex &vertex : vertices) {
 373                                         // Switch from -Z (south) to -X (west)
 374                                         vertex.Pos.rotateXZBy(-90);
 375                                         vertex.Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
 376                                 }
 377                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 378
 379                                 d = moonsize * 1.3;
 380                                 c = mooncolor;
 381                                 c.setAlpha(0.15 * 255);
 382                                 vertices[0] = video::S3DVertex(-d, -d, -1, 0, 0, 1, c, t, t);
 383                                 vertices[1] = video::S3DVertex( d, -d, -1, 0, 0, 1, c, o, t);
 384                                 vertices[2] = video::S3DVertex( d,  d, -1, 0, 0, 1, c, o, o);
 385                                 vertices[3] = video::S3DVertex(-d,  d, -1, 0, 0, 1, c, t, o);
 386                                 for (video::S3DVertex &vertex : vertices) {
 387                                         // Switch from -Z (south) to -X (west)
 388                                         vertex.Pos.rotateXZBy(-90);
 389                                         vertex.Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
 390                                 }
 391                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 392
 393                                 d = moonsize;
 394                                 vertices[0] = video::S3DVertex(-d, -d, -1, 0, 0, 1, mooncolor, t, t);
 395                                 vertices[1] = video::S3DVertex( d, -d, -1, 0, 0, 1, mooncolor, o, t);
 396                                 vertices[2] = video::S3DVertex( d,  d, -1, 0, 0, 1, mooncolor, o, o);
 397                                 vertices[3] = video::S3DVertex(-d,  d, -1, 0, 0, 1, mooncolor, t, o);
 398                                 for (video::S3DVertex &vertex : vertices) {
 399                                         // Switch from -Z (south) to -X (west)
 400                                         vertex.Pos.rotateXZBy(-90);
 401                                         vertex.Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
 402                                 }
 403                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 404
 405                                 float d2 = moonsize * 0.6;
 406                                 vertices[0] = video::S3DVertex(-d, -d,  -1, 0, 0, 1, mooncolor2, t, t);
 407                                 vertices[1] = video::S3DVertex( d2,-d,  -1, 0, 0, 1, mooncolor2, o, t);
 408                                 vertices[2] = video::S3DVertex( d2, d2, -1, 0, 0, 1, mooncolor2, o, o);
 409                                 vertices[3] = video::S3DVertex(-d,  d2, -1, 0, 0, 1, mooncolor2, t, o);
 410                                 for (video::S3DVertex &vertex : vertices) {
 411                                         // Switch from -Z (south) to -X (west)
 412                                         vertex.Pos.rotateXZBy(-90);
 413                                         vertex.Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
 414                                 }
 415                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 416                         } else {
 417                                 driver->setMaterial(m_materials[4]);
 418                                 float d = moonsize * 1.9;
 419                                 video::SColor c;
 420                                 if (m_moon_tonemap)
 421                                         c = video::SColor (0, 0, 0, 0);
 422                                 else
 423                                         c = video::SColor (255, 255, 255, 255);
 424                                 vertices[0] = video::S3DVertex(-d, -d, -1, 0, 0, 1, c, t, t);
 425                                 vertices[1] = video::S3DVertex( d, -d, -1, 0, 0, 1, c, o, t);
 426                                 vertices[2] = video::S3DVertex( d,  d, -1, 0, 0, 1, c, o, o);
 427                                 vertices[3] = video::S3DVertex(-d,  d, -1, 0, 0, 1, c, t, o);
 428                                 for (video::S3DVertex &vertex : vertices) {
 429                                         // Switch from -Z (south) to -X (west)
 430                                         vertex.Pos.rotateXZBy(-90);
 431                                         vertex.Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
 432                                 }
 433                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 434                         }
 435                 }
 436
 437                 // Draw stars
 438                 do {
 439                         driver->setMaterial(m_materials[1]);
 440                         float starbrightness = MYMAX(0, MYMIN(1,
 441                                 (0.285 - fabs(wicked_time_of_day < 0.5 ?
 442                                 wicked_time_of_day : (1.0 - wicked_time_of_day))) * 10));
 443                         float f = starbrightness;
 444                         float d = 0.007;
 445                         video::SColor starcolor(255, f * 90, f * 90, f * 90);
 446                         if (starcolor.getBlue() < m_skycolor.getBlue())
 447                                 break;
 448                         u16 indices[SKY_STAR_COUNT * 4];
 449                         video::S3DVertex vertices[SKY_STAR_COUNT * 4];
 450                         for (u32 i = 0; i < SKY_STAR_COUNT; i++) {
 451                                 indices[i * 4 + 0] = i * 4 + 0;
 452                                 indices[i * 4 + 1] = i * 4 + 1;
 453                                 indices[i * 4 + 2] = i * 4 + 2;
 454                                 indices[i * 4 + 3] = i * 4 + 3;
 455                                 v3f p = m_stars[i];
 456                                 core::CMatrix4<f32> a;
 457                                 a.buildRotateFromTo(v3f(0, 1, 0), v3f(d, 1 + d / 2, 0));
 458                                 v3f p1 = p;
 459                                 a.rotateVect(p1);
 460                                 a.buildRotateFromTo(v3f(0, 1, 0), v3f(d, 1, d));
 461                                 v3f p2 = p;
 462                                 a.rotateVect(p2);
 463                                 a.buildRotateFromTo(v3f(0, 1, 0), v3f(0, 1 - d / 2, d));
 464                                 v3f p3 = p;
 465                                 a.rotateVect(p3);
 466                                 p.rotateXYBy(wicked_time_of_day * 360 - 90);
 467                                 p1.rotateXYBy(wicked_time_of_day * 360 - 90);
 468                                 p2.rotateXYBy(wicked_time_of_day * 360 - 90);
 469                                 p3.rotateXYBy(wicked_time_of_day * 360 - 90);
 470                                 vertices[i * 4 + 0].Pos = p;
 471                                 vertices[i * 4 + 0].Color = starcolor;
 472                                 vertices[i * 4 + 1].Pos = p1;
 473                                 vertices[i * 4 + 1].Color = starcolor;
 474                                 vertices[i * 4 + 2].Pos = p2;
 475                                 vertices[i * 4 + 2].Color = starcolor;
 476                                 vertices[i * 4 + 3].Pos = p3;
 477                                 vertices[i * 4 + 3].Color = starcolor;
 478                         }
 479                         driver->drawVertexPrimitiveList(vertices, SKY_STAR_COUNT * 4,
 480                                 indices, SKY_STAR_COUNT, video::EVT_STANDARD,
 481                                 scene::EPT_QUADS, video::EIT_16BIT);
 482                 } while(false);
 483
 484                 // Draw far cloudy fog thing below east and west horizons
 485                 for (u32 j = 0; j < 2; j++) {
 486                         video::SColor c = cloudyfogcolor;
 487                         vertices[0] = video::S3DVertex(-1, -1.0,  -1, 0, 0, 1, c, t, t);
 488                         vertices[1] = video::S3DVertex( 1, -1.0,  -1, 0, 0, 1, c, o, t);
 489                         vertices[2] = video::S3DVertex( 1, -0.02, -1, 0, 0, 1, c, o, o);
 490                         vertices[3] = video::S3DVertex(-1, -0.02, -1, 0, 0, 1, c, t, o);
 491                         for (video::S3DVertex &vertex : vertices) {
 492                                 //if (wicked_time_of_day < 0.5)
 493                                 if (j == 0)
 494                                         // Switch from -Z (south) to +X (east)
 495                                         vertex.Pos.rotateXZBy(90);
 496                                 else
 497                                         // Switch from -Z (south) to -X (west)
 498                                         vertex.Pos.rotateXZBy(-90);
 499                         }
 500                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 501                 }
 502         }
 503 }
 504
 505
 506 void Sky::update(float time_of_day, float time_brightness,
 507                 float direct_brightness, bool sunlight_seen,
 508                 CameraMode cam_mode, float yaw, float pitch)
 509 {
 510         // Stabilize initial brightness and color values by flooding updates
 511         if (m_first_update) {
 512                 /*dstream<<"First update with time_of_day="<<time_of_day
 513                                 <<" time_brightness="<<time_brightness
 514                                 <<" direct_brightness="<<direct_brightness
 515                                 <<" sunlight_seen="<<sunlight_seen<<std::endl;*/
 516                 m_first_update = false;
 517                 for (u32 i = 0; i < 100; i++) {
 518                         update(time_of_day, time_brightness, direct_brightness,
 519                                 sunlight_seen, cam_mode, yaw, pitch);
 520                 }
 521                 return;
 522         }
 523
 524         m_time_of_day = time_of_day;
 525         m_time_brightness = time_brightness;
 526         m_sunlight_seen = sunlight_seen;
 527         m_bodies_visible = true;
 528
 529         bool is_dawn = (time_brightness >= 0.20 && time_brightness < 0.35);
 530
 531         /*
 532         Development colours
 533
 534         video::SColorf bgcolor_bright_normal_f(170. / 255, 200. / 255, 230. / 255, 1.0);
 535         video::SColorf bgcolor_bright_dawn_f(0.666, 200. / 255 * 0.7, 230. / 255 * 0.5, 1.0);
 536         video::SColorf bgcolor_bright_dawn_f(0.666, 0.549, 0.220, 1.0);
 537         video::SColorf bgcolor_bright_dawn_f(0.666 * 1.2, 0.549 * 1.0, 0.220 * 1.0, 1.0);
 538         video::SColorf bgcolor_bright_dawn_f(0.666 * 1.2, 0.549 * 1.0, 0.220 * 1.2, 1.0);
 539
 540         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.591, 0.4);
 541         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.65, 0.44);
 542         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.7, 0.5);
 543         */
 544
 545         video::SColorf bgcolor_bright_normal_f = video::SColor(255, 155, 193, 240);
 546         video::SColorf bgcolor_bright_indoor_f = video::SColor(255, 100, 100, 100);
 547         video::SColorf bgcolor_bright_dawn_f = video::SColor(255, 186, 193, 240);
 548         video::SColorf bgcolor_bright_night_f = video::SColor(255, 64, 144, 255);
 549
 550         video::SColorf skycolor_bright_normal_f = video::SColor(255, 140, 186, 250);
 551         video::SColorf skycolor_bright_dawn_f = video::SColor(255, 180, 186, 250);
 552         video::SColorf skycolor_bright_night_f = video::SColor(255, 0, 107, 255);
 553
 554         // pure white: becomes "diffuse light component" for clouds
 555         video::SColorf cloudcolor_bright_normal_f = video::SColor(255, 255, 255, 255);
 556         // dawn-factoring version of pure white (note: R is above 1.0)
 557         video::SColorf cloudcolor_bright_dawn_f(255.0f/240.0f, 223.0f/240.0f, 191.0f/255.0f);
 558
 559         float cloud_color_change_fraction = 0.95;
 560         if (sunlight_seen) {
 561                 if (std::fabs(time_brightness - m_brightness) < 0.2f) {
 562                         m_brightness = m_brightness * 0.95 + time_brightness * 0.05;
 563                 } else {
 564                         m_brightness = m_brightness * 0.80 + time_brightness * 0.20;
 565                         cloud_color_change_fraction = 0.0;
 566                 }
 567         } else {
 568                 if (direct_brightness < m_brightness)
 569                         m_brightness = m_brightness * 0.95 + direct_brightness * 0.05;
 570                 else
 571                         m_brightness = m_brightness * 0.98 + direct_brightness * 0.02;
 572         }
 573
 574         m_clouds_visible = true;
 575         float color_change_fraction = 0.98;
 576         if (sunlight_seen) {
 577                 if (is_dawn) {  // Dawn
 578                         m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 579                                 bgcolor_bright_dawn_f, color_change_fraction);
 580                         m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 581                                 skycolor_bright_dawn_f, color_change_fraction);
 582                         m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 583                                 cloudcolor_bright_dawn_f, color_change_fraction);
 584                 } else {
 585                         if (time_brightness < 0.07) {  // Night
 586                                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 587                                         bgcolor_bright_night_f, color_change_fraction);
 588                                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 589                                         skycolor_bright_night_f, color_change_fraction);
 590                         } else {  // Day
 591                                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 592                                         bgcolor_bright_normal_f, color_change_fraction);
 593                                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 594                                         skycolor_bright_normal_f, color_change_fraction);
 595                         }
 596
 597                         m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 598                                 cloudcolor_bright_normal_f, color_change_fraction);
 599                 }
 600         } else {
 601                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 602                         bgcolor_bright_indoor_f, color_change_fraction);
 603                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 604                         bgcolor_bright_indoor_f, color_change_fraction);
 605                 m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 606                         cloudcolor_bright_normal_f, color_change_fraction);
 607                 m_clouds_visible = false;
 608         }
 609
 610         video::SColor bgcolor_bright = m_bgcolor_bright_f.toSColor();
 611         m_bgcolor = video::SColor(
 612                 255,
 613                 bgcolor_bright.getRed() * m_brightness,
 614                 bgcolor_bright.getGreen() * m_brightness,
 615                 bgcolor_bright.getBlue() * m_brightness
 616         );
 617
 618         video::SColor skycolor_bright = m_skycolor_bright_f.toSColor();
 619         m_skycolor = video::SColor(
 620                 255,
 621                 skycolor_bright.getRed() * m_brightness,
 622                 skycolor_bright.getGreen() * m_brightness,
 623                 skycolor_bright.getBlue() * m_brightness
 624         );
 625
 626         // Horizon coloring based on sun and moon direction during sunset and sunrise
 627         video::SColor pointcolor = video::SColor(m_bgcolor.getAlpha(), 255, 255, 255);
 628         if (m_directional_colored_fog) {
 629                 if (m_horizon_blend() != 0) {
 630                         // Calculate hemisphere value from yaw, (inverted in third person front view)
 631                         s8 dir_factor = 1;
 632                         if (cam_mode > CAMERA_MODE_THIRD)
 633                                 dir_factor = -1;
 634                         f32 pointcolor_blend = wrapDegrees_0_360(yaw * dir_factor + 90);
 635                         if (pointcolor_blend > 180)
 636                                 pointcolor_blend = 360 - pointcolor_blend;
 637                         pointcolor_blend /= 180;
 638                         // Bound view angle to determine where transition starts and ends
 639                         pointcolor_blend = rangelim(1 - pointcolor_blend * 1.375, 0, 1 / 1.375) *
 640                                 1.375;
 641                         // Combine the colors when looking up or down, otherwise turning looks weird
 642                         pointcolor_blend += (0.5 - pointcolor_blend) *
 643                                 (1 - MYMIN((90 - std::fabs(pitch)) / 90 * 1.5, 1));
 644                         // Invert direction to match where the sun and moon are rising
 645                         if (m_time_of_day > 0.5)
 646                                 pointcolor_blend = 1 - pointcolor_blend;
 647                         // Horizon colors of sun and moon
 648                         f32 pointcolor_light = rangelim(m_time_brightness * 3, 0.2, 1);
 649
 650                         video::SColorf pointcolor_sun_f(1, 1, 1, 1);
 651                         if (m_sun_tonemap) {
 652                                 pointcolor_sun_f.r = pointcolor_light *
 653                                         (float)m_materials[3].EmissiveColor.getRed() / 255;
 654                                 pointcolor_sun_f.b = pointcolor_light *
 655                                         (float)m_materials[3].EmissiveColor.getBlue() / 255;
 656                                 pointcolor_sun_f.g = pointcolor_light *
 657                                         (float)m_materials[3].EmissiveColor.getGreen() / 255;
 658                         } else {
 659                                 pointcolor_sun_f.r = pointcolor_light * 1;
 660                                 pointcolor_sun_f.b = pointcolor_light *
 661                                         (0.25 + (rangelim(m_time_brightness, 0.25, 0.75) - 0.25) * 2 * 0.75);
 662                                 pointcolor_sun_f.g = pointcolor_light * (pointcolor_sun_f.b * 0.375 +
 663                                         (rangelim(m_time_brightness, 0.05, 0.15) - 0.05) * 10 * 0.625);
 664                         }
 665
 666                         video::SColorf pointcolor_moon_f(0.5 * pointcolor_light,
 667                                 0.6 * pointcolor_light, 0.8 * pointcolor_light, 1);
 668                         if (m_moon_tonemap) {
 669                                 pointcolor_moon_f.r = pointcolor_light *
 670                                         (float)m_materials[4].EmissiveColor.getRed() / 255;
 671                                 pointcolor_moon_f.b = pointcolor_light *
 672                                         (float)m_materials[4].EmissiveColor.getBlue() / 255;
 673                                 pointcolor_moon_f.g = pointcolor_light *
 674                                         (float)m_materials[4].EmissiveColor.getGreen() / 255;
 675                         }
 676
 677                         video::SColor pointcolor_sun = pointcolor_sun_f.toSColor();
 678                         video::SColor pointcolor_moon = pointcolor_moon_f.toSColor();
 679                         // Calculate the blend color
 680                         pointcolor = m_mix_scolor(pointcolor_moon, pointcolor_sun, pointcolor_blend);
 681                 }
 682                 m_bgcolor = m_mix_scolor(m_bgcolor, pointcolor, m_horizon_blend() * 0.5);
 683                 m_skycolor = m_mix_scolor(m_skycolor, pointcolor, m_horizon_blend() * 0.25);
 684         }
 685
 686         float cloud_direct_brightness = 0;
 687         if (sunlight_seen) {
 688                 if (!m_directional_colored_fog) {
 689                         cloud_direct_brightness = time_brightness;
 690                         if (time_brightness >= 0.2 && time_brightness < 0.7)
 691                                 cloud_direct_brightness *= 1.3;
 692                 } else {
 693                         cloud_direct_brightness = MYMIN(m_horizon_blend() * 0.15 +
 694                                 m_time_brightness, 1);
 695                 }
 696         } else {
 697                 cloud_direct_brightness = direct_brightness;
 698         }
 699
 700         m_cloud_brightness = m_cloud_brightness * cloud_color_change_fraction +
 701                 cloud_direct_brightness * (1.0 - cloud_color_change_fraction);
 702         m_cloudcolor_f = video::SColorf(
 703                 m_cloudcolor_bright_f.r * m_cloud_brightness,
 704                 m_cloudcolor_bright_f.g * m_cloud_brightness,
 705                 m_cloudcolor_bright_f.b * m_cloud_brightness,
 706                 1.0
 707         );
 708         if (m_directional_colored_fog) {
 709                 m_cloudcolor_f = m_mix_scolorf(m_cloudcolor_f,
 710                         video::SColorf(pointcolor), m_horizon_blend() * 0.25);
 711         }
 712 }