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 "ITexture.h"
  22 #include "IVideoDriver.h"
  23 #include "ISceneManager.h"
  24 #include "ICameraSceneNode.h"
  25 #include "S3DVertex.h"
  26 #include "client/tile.h"
  27 #include "noise.h" // easeCurve
  28 #include "profiler.h"
  29 #include "util/numeric.h"
  30 #include <cmath>
  31 #include "client/renderingengine.h"
  32 #include "settings.h"
  33 #include "camera.h" // CameraModes
  34 #include "config.h"
  35 using namespace irr::core;
  36
  37 Sky::Sky(s32 id, ITextureSource *tsrc) :
  38                 scene::ISceneNode(RenderingEngine::get_scene_manager()->getRootSceneNode(),
  39                         RenderingEngine::get_scene_manager(), id)
  40 {
  41         setAutomaticCulling(scene::EAC_OFF);
  42         m_box.MaxEdge.set(0, 0, 0);
  43         m_box.MinEdge.set(0, 0, 0);
  44
  45         // Create material
  46
  47         video::SMaterial mat;
  48         mat.Lighting = false;
  49 #if ENABLE_GLES
  50         mat.ZBuffer = video::ECFN_DISABLED;
  51 #else
  52         mat.ZBuffer = video::ECFN_NEVER;
  53 #endif
  54         mat.ZWriteEnable = false;
  55         mat.AntiAliasing = 0;
  56         mat.TextureLayer[0].TextureWrapU = video::ETC_CLAMP_TO_EDGE;
  57         mat.TextureLayer[0].TextureWrapV = video::ETC_CLAMP_TO_EDGE;
  58         mat.BackfaceCulling = false;
  59
  60         m_materials[0] = mat;
  61
  62         m_materials[1] = mat;
  63         //m_materials[1].MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  64         m_materials[1].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  65
  66         m_materials[2] = mat;
  67         m_materials[2].setTexture(0, tsrc->getTextureForMesh("sunrisebg.png"));
  68         m_materials[2].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  69         //m_materials[2].MaterialType = video::EMT_TRANSPARENT_ADD_COLOR;
  70
  71         // Ensures that sun and moon textures and tonemaps are correct.
  72         setSkyDefaults();
  73         m_sun_texture = tsrc->isKnownSourceImage(m_sun_params.texture) ?
  74                 tsrc->getTextureForMesh(m_sun_params.texture) : NULL;
  75         m_moon_texture = tsrc->isKnownSourceImage(m_moon_params.texture) ?
  76                 tsrc->getTextureForMesh(m_moon_params.texture) : NULL;
  77         m_sun_tonemap = tsrc->isKnownSourceImage(m_sun_params.tonemap) ?
  78                 tsrc->getTexture(m_sun_params.tonemap) : NULL;
  79         m_moon_tonemap = tsrc->isKnownSourceImage(m_moon_params.tonemap) ?
  80                 tsrc->getTexture(m_moon_params.tonemap) : NULL;
  81
  82         if (m_sun_texture) {
  83                 m_materials[3] = mat;
  84                 m_materials[3].setTexture(0, m_sun_texture);
  85                 m_materials[3].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  86                 // Disables texture filtering
  87                 m_materials[3].setFlag(video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
  88                 m_materials[3].setFlag(video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
  89                 m_materials[3].setFlag(video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
  90                 // Use tonemaps if available
  91                 if (m_sun_tonemap)
  92                         m_materials[3].Lighting = true;
  93         }
  94         if (m_moon_texture) {
  95                 m_materials[4] = mat;
  96                 m_materials[4].setTexture(0, m_moon_texture);
  97                 m_materials[4].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  98                 // Disables texture filtering
  99                 m_materials[4].setFlag(video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
 100                 m_materials[4].setFlag(video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
 101                 m_materials[4].setFlag(video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
 102                 // Use tonemaps if available
 103                 if (m_moon_tonemap)
 104                         m_materials[4].Lighting = true;
 105         }
 106
 107         for (int i = 5; i < 11; i++) {
 108                 m_materials[i] = mat;
 109                 m_materials[i].Lighting = true;
 110                 m_materials[i].MaterialType = video::EMT_SOLID;
 111         }
 112         m_directional_colored_fog = g_settings->getBool("directional_colored_fog");
 113         setStarCount(1000, true);
 114 }
 115
 116 void Sky::OnRegisterSceneNode()
 117 {
 118         if (IsVisible)
 119                 SceneManager->registerNodeForRendering(this, scene::ESNRP_SKY_BOX);
 120
 121         scene::ISceneNode::OnRegisterSceneNode();
 122 }
 123
 124 void Sky::render()
 125 {
 126         video::IVideoDriver *driver = SceneManager->getVideoDriver();
 127         scene::ICameraSceneNode *camera = SceneManager->getActiveCamera();
 128
 129         if (!camera || !driver)
 130                 return;
 131
 132         ScopeProfiler sp(g_profiler, "Sky::render()", SPT_AVG);
 133
 134         // Draw perspective skybox
 135
 136         core::matrix4 translate(AbsoluteTransformation);
 137         translate.setTranslation(camera->getAbsolutePosition());
 138
 139         // Draw the sky box between the near and far clip plane
 140         const f32 viewDistance = (camera->getNearValue() + camera->getFarValue()) * 0.5f;
 141         core::matrix4 scale;
 142         scale.setScale(core::vector3df(viewDistance, viewDistance, viewDistance));
 143
 144         driver->setTransform(video::ETS_WORLD, translate * scale);
 145
 146         if (m_sunlight_seen) {
 147                 float sunsize = 0.07;
 148                 video::SColorf suncolor_f(1, 1, 0, 1);
 149                 //suncolor_f.r = 1;
 150                 //suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.7 + m_time_brightness * 0.5));
 151                 //suncolor_f.b = MYMAX(0.0, m_brightness * 0.95);
 152                 video::SColorf suncolor2_f(1, 1, 1, 1);
 153                 // The values below were probably meant to be suncolor2_f instead of a
 154                 // reassignment of suncolor_f. However, the resulting colour was chosen
 155                 // and is our long-running classic colour. So preserve, but comment-out
 156                 // the unnecessary first assignments above.
 157                 suncolor_f.r = 1;
 158                 suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.85 + m_time_brightness * 0.5));
 159                 suncolor_f.b = MYMAX(0.0, m_brightness);
 160
 161                 float moonsize = 0.04;
 162                 video::SColorf mooncolor_f(0.50, 0.57, 0.65, 1);
 163                 video::SColorf mooncolor2_f(0.85, 0.875, 0.9, 1);
 164
 165                 float nightlength = 0.415;
 166                 float wn = nightlength / 2;
 167                 float wicked_time_of_day = 0;
 168                 if (m_time_of_day > wn && m_time_of_day < 1.0 - wn)
 169                         wicked_time_of_day = (m_time_of_day - wn) / (1.0 - wn * 2) * 0.5 + 0.25;
 170                 else if (m_time_of_day < 0.5)
 171                         wicked_time_of_day = m_time_of_day / wn * 0.25;
 172                 else
 173                         wicked_time_of_day = 1.0 - ((1.0 - m_time_of_day) / wn * 0.25);
 174                 /*std::cerr<<"time_of_day="<<m_time_of_day<<" -> "
 175                                 <<"wicked_time_of_day="<<wicked_time_of_day<<std::endl;*/
 176
 177                 video::SColor suncolor = suncolor_f.toSColor();
 178                 video::SColor suncolor2 = suncolor2_f.toSColor();
 179                 video::SColor mooncolor = mooncolor_f.toSColor();
 180                 video::SColor mooncolor2 = mooncolor2_f.toSColor();
 181
 182                 // Calculate offset normalized to the X dimension of a 512x1 px tonemap
 183                 float offset = (1.0 - fabs(sin((m_time_of_day - 0.5) * irr::core::PI))) * 511;
 184
 185                 if (m_sun_tonemap) {
 186                         u8 * texels = (u8 *)m_sun_tonemap->lock();
 187                         video::SColor* texel = (video::SColor *)(texels + (u32)offset * 4);
 188                         video::SColor texel_color (255, texel->getRed(),
 189                                 texel->getGreen(), texel->getBlue());
 190                         m_sun_tonemap->unlock();
 191                         m_materials[3].EmissiveColor = texel_color;
 192                 }
 193
 194                 if (m_moon_tonemap) {
 195                         u8 * texels = (u8 *)m_moon_tonemap->lock();
 196                         video::SColor* texel = (video::SColor *)(texels + (u32)offset * 4);
 197                         video::SColor texel_color (255, texel->getRed(),
 198                                 texel->getGreen(), texel->getBlue());
 199                         m_moon_tonemap->unlock();
 200                         m_materials[4].EmissiveColor = texel_color;
 201                 }
 202
 203                 const f32 t = 1.0f;
 204                 const f32 o = 0.0f;
 205                 static const u16 indices[4] = {0, 1, 2, 3};
 206                 video::S3DVertex vertices[4];
 207
 208                 driver->setMaterial(m_materials[1]);
 209
 210                 video::SColor cloudyfogcolor = m_bgcolor;
 211
 212                 // Abort rendering if we're in the clouds.
 213                 // Stops rendering a pure white hole in the bottom of the skybox.
 214                 if (m_in_clouds)
 215                         return;
 216
 217                 // Draw the six sided skybox,
 218                 if (m_sky_params.textures.size() == 6) {
 219                         for (u32 j = 5; j < 11; j++) {
 220                                 video::SColor c(255, 255, 255, 255);
 221                                 driver->setMaterial(m_materials[j]);
 222                                 // Use 1.05 rather than 1.0 to avoid colliding with the
 223                                 // sun, moon and stars, as this is a background skybox.
 224                                 vertices[0] = video::S3DVertex(-1.05, -1.05, -1.05, 0, 0, 1, c, t, t);
 225                                 vertices[1] = video::S3DVertex( 1.05, -1.05, -1.05, 0, 0, 1, c, o, t);
 226                                 vertices[2] = video::S3DVertex( 1.05,  1.05, -1.05, 0, 0, 1, c, o, o);
 227                                 vertices[3] = video::S3DVertex(-1.05,  1.05, -1.05, 0, 0, 1, c, t, o);
 228                                 for (video::S3DVertex &vertex : vertices) {
 229                                         if (j == 5) { // Top texture
 230                                                 vertex.Pos.rotateYZBy(90);
 231                                                 vertex.Pos.rotateXZBy(90);
 232                                         } else if (j == 6) { // Bottom texture
 233                                                 vertex.Pos.rotateYZBy(-90);
 234                                                 vertex.Pos.rotateXZBy(90);
 235                                         } else if (j == 7) { // Left texture
 236                                                 vertex.Pos.rotateXZBy(90);
 237                                         } else if (j == 8) { // Right texture
 238                                                 vertex.Pos.rotateXZBy(-90);
 239                                         } else if (j == 9) { // Front texture, do nothing
 240                                                 // Irrlicht doesn't like it when vertexes are left
 241                                                 // alone and not rotated for some reason.
 242                                                 vertex.Pos.rotateXZBy(0);
 243                                         } else {// Back texture
 244                                                 vertex.Pos.rotateXZBy(180);
 245                                         }
 246                                 }
 247                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 248                         }
 249                 }
 250
 251                 // Draw far cloudy fog thing blended with skycolor
 252                 if (m_visible) {
 253                         driver->setMaterial(m_materials[1]);
 254                         for (u32 j = 0; j < 4; j++) {
 255                                 video::SColor c = cloudyfogcolor.getInterpolated(m_skycolor, 0.45);
 256                                 vertices[0] = video::S3DVertex(-1, 0.08, -1, 0, 0, 1, c, t, t);
 257                                 vertices[1] = video::S3DVertex( 1, 0.08, -1, 0, 0, 1, c, o, t);
 258                                 vertices[2] = video::S3DVertex( 1, 0.12, -1, 0, 0, 1, c, o, o);
 259                                 vertices[3] = video::S3DVertex(-1, 0.12, -1, 0, 0, 1, c, t, o);
 260                                 for (video::S3DVertex &vertex : vertices) {
 261                                         if (j == 0)
 262                                                 // Don't switch
 263                                                 {}
 264                                         else if (j == 1)
 265                                                 // Switch from -Z (south) to +X (east)
 266                                                 vertex.Pos.rotateXZBy(90);
 267                                         else if (j == 2)
 268                                                 // Switch from -Z (south) to -X (west)
 269                                                 vertex.Pos.rotateXZBy(-90);
 270                                         else
 271                                                 // Switch from -Z (south) to +Z (north)
 272                                                 vertex.Pos.rotateXZBy(-180);
 273                                 }
 274                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 275                         }
 276
 277                         // Draw far cloudy fog thing at and below all horizons
 278                         for (u32 j = 0; j < 4; j++) {
 279                                 video::SColor c = cloudyfogcolor;
 280                                 vertices[0] = video::S3DVertex(-1, -1.0, -1, 0, 0, 1, c, t, t);
 281                                 vertices[1] = video::S3DVertex( 1, -1.0, -1, 0, 0, 1, c, o, t);
 282                                 vertices[2] = video::S3DVertex( 1, 0.08, -1, 0, 0, 1, c, o, o);
 283                                 vertices[3] = video::S3DVertex(-1, 0.08, -1, 0, 0, 1, c, t, o);
 284                                 for (video::S3DVertex &vertex : vertices) {
 285                                         if (j == 0)
 286                                                 // Don't switch
 287                                                 {}
 288                                         else if (j == 1)
 289                                                 // Switch from -Z (south) to +X (east)
 290                                                 vertex.Pos.rotateXZBy(90);
 291                                         else if (j == 2)
 292                                                 // Switch from -Z (south) to -X (west)
 293                                                 vertex.Pos.rotateXZBy(-90);
 294                                         else
 295                                                 // Switch from -Z (south) to +Z (north)
 296                                                 vertex.Pos.rotateXZBy(-180);
 297                                 }
 298                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 299                         }
 300                 }
 301
 302                 // Draw stars before sun and moon to be behind them
 303                 if (m_star_params.visible)
 304                         draw_stars(driver, wicked_time_of_day);
 305
 306                 // Draw sunrise/sunset horizon glow texture
 307                 // (textures/base/pack/sunrisebg.png)
 308                 if (m_sun_params.sunrise_visible) {
 309                         driver->setMaterial(m_materials[2]);
 310                         float mid1 = 0.25;
 311                         float mid = wicked_time_of_day < 0.5 ? mid1 : (1.0 - mid1);
 312                         float a_ = 1.0f - std::fabs(wicked_time_of_day - mid) * 35.0f;
 313                         float a = easeCurve(MYMAX(0, MYMIN(1, a_)));
 314                         //std::cerr<<"a_="<<a_<<" a="<<a<<std::endl;
 315                         video::SColor c(255, 255, 255, 255);
 316                         float y = -(1.0 - a) * 0.22;
 317                         vertices[0] = video::S3DVertex(-1, -0.05 + y, -1, 0, 0, 1, c, t, t);
 318                         vertices[1] = video::S3DVertex( 1, -0.05 + y, -1, 0, 0, 1, c, o, t);
 319                         vertices[2] = video::S3DVertex( 1,   0.2 + y, -1, 0, 0, 1, c, o, o);
 320                         vertices[3] = video::S3DVertex(-1,   0.2 + y, -1, 0, 0, 1, c, t, o);
 321                         for (video::S3DVertex &vertex : vertices) {
 322                                 if (wicked_time_of_day < 0.5)
 323                                         // Switch from -Z (south) to +X (east)
 324                                         vertex.Pos.rotateXZBy(90);
 325                                 else
 326                                         // Switch from -Z (south) to -X (west)
 327                                         vertex.Pos.rotateXZBy(-90);
 328                         }
 329                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 330                 }
 331
 332                 // Draw sun
 333                 if (m_sun_params.visible)
 334                         draw_sun(driver, sunsize, suncolor, suncolor2, wicked_time_of_day);
 335
 336                 // Draw moon
 337                 if (m_moon_params.visible)
 338                         draw_moon(driver, moonsize, mooncolor, mooncolor2, wicked_time_of_day);
 339
 340                 // Draw far cloudy fog thing below all horizons in front of sun, moon
 341                 // and stars.
 342                 if (m_visible) {
 343                         driver->setMaterial(m_materials[1]);
 344
 345                         for (u32 j = 0; j < 4; j++) {
 346                                 video::SColor c = cloudyfogcolor;
 347                                 vertices[0] = video::S3DVertex(-1, -1.0,  -1, 0, 0, 1, c, t, t);
 348                                 vertices[1] = video::S3DVertex( 1, -1.0,  -1, 0, 0, 1, c, o, t);
 349                                 vertices[2] = video::S3DVertex( 1, -0.02, -1, 0, 0, 1, c, o, o);
 350                                 vertices[3] = video::S3DVertex(-1, -0.02, -1, 0, 0, 1, c, t, o);
 351                                 for (video::S3DVertex &vertex : vertices) {
 352                                         if (j == 0)
 353                                                 // Don't switch
 354                                                 {}
 355                                         else if (j == 1)
 356                                                 // Switch from -Z (south) to +X (east)
 357                                                 vertex.Pos.rotateXZBy(90);
 358                                         else if (j == 2)
 359                                                 // Switch from -Z (south) to -X (west)
 360                                                 vertex.Pos.rotateXZBy(-90);
 361                                         else
 362                                                 // Switch from -Z (south) to +Z (north)
 363                                                 vertex.Pos.rotateXZBy(-180);
 364                                 }
 365                                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 366                         }
 367
 368                         // Draw bottom far cloudy fog thing in front of sun, moon and stars
 369                         video::SColor c = cloudyfogcolor;
 370                         vertices[0] = video::S3DVertex(-1, -1.0, -1, 0, 1, 0, c, t, t);
 371                         vertices[1] = video::S3DVertex( 1, -1.0, -1, 0, 1, 0, c, o, t);
 372                         vertices[2] = video::S3DVertex( 1, -1.0, 1, 0, 1, 0, c, o, o);
 373                         vertices[3] = video::S3DVertex(-1, -1.0, 1, 0, 1, 0, c, t, o);
 374                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 375                 }
 376         }
 377 }
 378
 379 void Sky::update(float time_of_day, float time_brightness,
 380         float direct_brightness, bool sunlight_seen,
 381         CameraMode cam_mode, float yaw, float pitch)
 382 {
 383         // Stabilize initial brightness and color values by flooding updates
 384         if (m_first_update) {
 385                 /*dstream<<"First update with time_of_day="<<time_of_day
 386                                 <<" time_brightness="<<time_brightness
 387                                 <<" direct_brightness="<<direct_brightness
 388                                 <<" sunlight_seen="<<sunlight_seen<<std::endl;*/
 389                 m_first_update = false;
 390                 for (u32 i = 0; i < 100; i++) {
 391                         update(time_of_day, time_brightness, direct_brightness,
 392                                         sunlight_seen, cam_mode, yaw, pitch);
 393                 }
 394                 return;
 395         }
 396
 397         m_time_of_day = time_of_day;
 398         m_time_brightness = time_brightness;
 399         m_sunlight_seen = sunlight_seen;
 400         m_in_clouds = false;
 401
 402         bool is_dawn = (time_brightness >= 0.20 && time_brightness < 0.35);
 403
 404         /*
 405         Development colours
 406
 407         video::SColorf bgcolor_bright_normal_f(170. / 255, 200. / 255, 230. / 255, 1.0);
 408         video::SColorf bgcolor_bright_dawn_f(0.666, 200. / 255 * 0.7, 230. / 255 * 0.5, 1.0);
 409         video::SColorf bgcolor_bright_dawn_f(0.666, 0.549, 0.220, 1.0);
 410         video::SColorf bgcolor_bright_dawn_f(0.666 * 1.2, 0.549 * 1.0, 0.220 * 1.0, 1.0);
 411         video::SColorf bgcolor_bright_dawn_f(0.666 * 1.2, 0.549 * 1.0, 0.220 * 1.2, 1.0);
 412
 413         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.591, 0.4);
 414         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.65, 0.44);
 415         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.7, 0.5);
 416         */
 417
 418         video::SColorf bgcolor_bright_normal_f = m_sky_params.sky_color.day_horizon;
 419         video::SColorf bgcolor_bright_indoor_f = m_sky_params.sky_color.indoors;
 420         video::SColorf bgcolor_bright_dawn_f = m_sky_params.sky_color.dawn_horizon;
 421         video::SColorf bgcolor_bright_night_f = m_sky_params.sky_color.night_horizon;
 422
 423         video::SColorf skycolor_bright_normal_f = m_sky_params.sky_color.day_sky;
 424         video::SColorf skycolor_bright_dawn_f = m_sky_params.sky_color.dawn_sky;
 425         video::SColorf skycolor_bright_night_f = m_sky_params.sky_color.night_sky;
 426
 427         video::SColorf cloudcolor_bright_normal_f = m_cloudcolor_day_f;
 428         video::SColorf cloudcolor_bright_dawn_f = m_cloudcolor_dawn_f;
 429
 430         float cloud_color_change_fraction = 0.95;
 431         if (sunlight_seen) {
 432                 if (std::fabs(time_brightness - m_brightness) < 0.2f) {
 433                         m_brightness = m_brightness * 0.95 + time_brightness * 0.05;
 434                 } else {
 435                         m_brightness = m_brightness * 0.80 + time_brightness * 0.20;
 436                         cloud_color_change_fraction = 0.0;
 437                 }
 438         } else {
 439                 if (direct_brightness < m_brightness)
 440                         m_brightness = m_brightness * 0.95 + direct_brightness * 0.05;
 441                 else
 442                         m_brightness = m_brightness * 0.98 + direct_brightness * 0.02;
 443         }
 444
 445         m_clouds_visible = true;
 446         float color_change_fraction = 0.98f;
 447         if (sunlight_seen) {
 448                 if (is_dawn) { // Dawn
 449                         m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 450                                 bgcolor_bright_dawn_f, color_change_fraction);
 451                         m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 452                                 skycolor_bright_dawn_f, color_change_fraction);
 453                         m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 454                                 cloudcolor_bright_dawn_f, color_change_fraction);
 455                 } else {
 456                         if (time_brightness < 0.13f) { // Night
 457                                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 458                                         bgcolor_bright_night_f, color_change_fraction);
 459                                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 460                                         skycolor_bright_night_f, color_change_fraction);
 461                         } else { // Day
 462                                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 463                                         bgcolor_bright_normal_f, color_change_fraction);
 464                                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 465                                         skycolor_bright_normal_f, color_change_fraction);
 466                         }
 467
 468                         m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 469                                 cloudcolor_bright_normal_f, color_change_fraction);
 470                 }
 471         } else {
 472                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 473                         bgcolor_bright_indoor_f, color_change_fraction);
 474                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 475                         bgcolor_bright_indoor_f, color_change_fraction);
 476                 m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 477                         cloudcolor_bright_normal_f, color_change_fraction);
 478                 m_clouds_visible = false;
 479         }
 480
 481         video::SColor bgcolor_bright = m_bgcolor_bright_f.toSColor();
 482         m_bgcolor = video::SColor(
 483                 255,
 484                 bgcolor_bright.getRed() * m_brightness,
 485                 bgcolor_bright.getGreen() * m_brightness,
 486                 bgcolor_bright.getBlue() * m_brightness
 487         );
 488
 489         video::SColor skycolor_bright = m_skycolor_bright_f.toSColor();
 490         m_skycolor = video::SColor(
 491                 255,
 492                 skycolor_bright.getRed() * m_brightness,
 493                 skycolor_bright.getGreen() * m_brightness,
 494                 skycolor_bright.getBlue() * m_brightness
 495         );
 496
 497         // Horizon coloring based on sun and moon direction during sunset and sunrise
 498         video::SColor pointcolor = video::SColor(m_bgcolor.getAlpha(), 255, 255, 255);
 499         if (m_directional_colored_fog) {
 500                 if (m_horizon_blend() != 0) {
 501                         // Calculate hemisphere value from yaw, (inverted in third person front view)
 502                         s8 dir_factor = 1;
 503                         if (cam_mode > CAMERA_MODE_THIRD)
 504                                 dir_factor = -1;
 505                         f32 pointcolor_blend = wrapDegrees_0_360(yaw * dir_factor + 90);
 506                         if (pointcolor_blend > 180)
 507                                 pointcolor_blend = 360 - pointcolor_blend;
 508                         pointcolor_blend /= 180;
 509                         // Bound view angle to determine where transition starts and ends
 510                         pointcolor_blend = rangelim(1 - pointcolor_blend * 1.375, 0, 1 / 1.375) *
 511                                 1.375;
 512                         // Combine the colors when looking up or down, otherwise turning looks weird
 513                         pointcolor_blend += (0.5 - pointcolor_blend) *
 514                                 (1 - MYMIN((90 - std::fabs(pitch)) / 90 * 1.5, 1));
 515                         // Invert direction to match where the sun and moon are rising
 516                         if (m_time_of_day > 0.5)
 517                                 pointcolor_blend = 1 - pointcolor_blend;
 518                         // Horizon colors of sun and moon
 519                         f32 pointcolor_light = rangelim(m_time_brightness * 3, 0.2, 1);
 520
 521                         video::SColorf pointcolor_sun_f(1, 1, 1, 1);
 522                         // Use tonemap only if default sun/moon tinting is used
 523                         // which keeps previous behaviour.
 524                         if (m_sun_tonemap && m_default_tint) {
 525                                 pointcolor_sun_f.r = pointcolor_light *
 526                                         (float)m_materials[3].EmissiveColor.getRed() / 255;
 527                                 pointcolor_sun_f.b = pointcolor_light *
 528                                         (float)m_materials[3].EmissiveColor.getBlue() / 255;
 529                                 pointcolor_sun_f.g = pointcolor_light *
 530                                         (float)m_materials[3].EmissiveColor.getGreen() / 255;
 531                         } else if (!m_default_tint) {
 532                                 pointcolor_sun_f = m_sky_params.fog_sun_tint;
 533                         } else {
 534                                 pointcolor_sun_f.r = pointcolor_light * 1;
 535                                 pointcolor_sun_f.b = pointcolor_light *
 536                                         (0.25 + (rangelim(m_time_brightness, 0.25, 0.75) - 0.25) * 2 * 0.75);
 537                                 pointcolor_sun_f.g = pointcolor_light * (pointcolor_sun_f.b * 0.375 +
 538                                         (rangelim(m_time_brightness, 0.05, 0.15) - 0.05) * 10 * 0.625);
 539                         }
 540
 541                         video::SColorf pointcolor_moon_f;
 542                         if (m_default_tint) {
 543                                 pointcolor_moon_f = video::SColorf(
 544                                         0.5 * pointcolor_light,
 545                                         0.6 * pointcolor_light,
 546                                         0.8 * pointcolor_light,
 547                                         1
 548                                 );
 549                         } else {
 550                                 pointcolor_moon_f = video::SColorf(
 551                                         (m_sky_params.fog_moon_tint.getRed() / 255) * pointcolor_light,
 552                                         (m_sky_params.fog_moon_tint.getGreen() / 255) * pointcolor_light,
 553                                         (m_sky_params.fog_moon_tint.getBlue() / 255) * pointcolor_light,
 554                                         1
 555                                 );
 556                         }
 557                         if (m_moon_tonemap && m_default_tint) {
 558                                 pointcolor_moon_f.r = pointcolor_light *
 559                                         (float)m_materials[4].EmissiveColor.getRed() / 255;
 560                                 pointcolor_moon_f.b = pointcolor_light *
 561                                         (float)m_materials[4].EmissiveColor.getBlue() / 255;
 562                                 pointcolor_moon_f.g = pointcolor_light *
 563                                         (float)m_materials[4].EmissiveColor.getGreen() / 255;
 564                         }
 565
 566                         video::SColor pointcolor_sun = pointcolor_sun_f.toSColor();
 567                         video::SColor pointcolor_moon = pointcolor_moon_f.toSColor();
 568                         // Calculate the blend color
 569                         pointcolor = m_mix_scolor(pointcolor_moon, pointcolor_sun, pointcolor_blend);
 570                 }
 571                 m_bgcolor = m_mix_scolor(m_bgcolor, pointcolor, m_horizon_blend() * 0.5);
 572                 m_skycolor = m_mix_scolor(m_skycolor, pointcolor, m_horizon_blend() * 0.25);
 573         }
 574
 575         float cloud_direct_brightness = 0.0f;
 576         if (sunlight_seen) {
 577                 if (!m_directional_colored_fog) {
 578                         cloud_direct_brightness = time_brightness;
 579                         // Boost cloud brightness relative to sky, at dawn, dusk and at night
 580                         if (time_brightness < 0.7f)
 581                                 cloud_direct_brightness *= 1.3f;
 582                 } else {
 583                         cloud_direct_brightness = std::fmin(m_horizon_blend() * 0.15f +
 584                                 m_time_brightness, 1.0f);
 585                         // Set the same minimum cloud brightness at night
 586                         if (time_brightness < 0.5f)
 587                                 cloud_direct_brightness = std::fmax(cloud_direct_brightness,
 588                                         time_brightness * 1.3f);
 589                 }
 590         } else {
 591                 cloud_direct_brightness = direct_brightness;
 592         }
 593
 594         m_cloud_brightness = m_cloud_brightness * cloud_color_change_fraction +
 595                 cloud_direct_brightness * (1.0 - cloud_color_change_fraction);
 596         m_cloudcolor_f = video::SColorf(
 597                 m_cloudcolor_bright_f.r * m_cloud_brightness,
 598                 m_cloudcolor_bright_f.g * m_cloud_brightness,
 599                 m_cloudcolor_bright_f.b * m_cloud_brightness,
 600                 1.0
 601         );
 602         if (m_directional_colored_fog) {
 603                 m_cloudcolor_f = m_mix_scolorf(m_cloudcolor_f,
 604                         video::SColorf(pointcolor), m_horizon_blend() * 0.25);
 605         }
 606 }
 607
 608 void Sky::draw_sun(video::IVideoDriver *driver, float sunsize, const video::SColor &suncolor,
 609         const video::SColor &suncolor2, float wicked_time_of_day)
 610         /* Draw sun in the sky.
 611          * driver: Video driver object used to draw
 612          * sunsize: the default size of the sun
 613          * suncolor: main sun color
 614          * suncolor2: second sun color
 615          * wicked_time_of_day: current time of day, to know where should be the sun in the sky
 616          */
 617 {
 618         static const u16 indices[4] = {0, 1, 2, 3};
 619         std::array<video::S3DVertex, 4> vertices;
 620         if (!m_sun_texture) {
 621                 driver->setMaterial(m_materials[1]);
 622                 const float sunsizes[4] = {
 623                         (sunsize * 1.7f) * m_sun_params.scale,
 624                         (sunsize * 1.2f) * m_sun_params.scale,
 625                         (sunsize) * m_sun_params.scale,
 626                         (sunsize * 0.7f) * m_sun_params.scale
 627                 };
 628                 video::SColor c1 = suncolor;
 629                 video::SColor c2 = suncolor;
 630                 c1.setAlpha(0.05 * 255);
 631                 c2.setAlpha(0.15 * 255);
 632                 const video::SColor colors[4] = {c1, c2, suncolor, suncolor2};
 633                 for (int i = 0; i < 4; i++) {
 634                         draw_sky_body(vertices, -sunsizes[i], sunsizes[i], colors[i]);
 635                         place_sky_body(vertices, 90, wicked_time_of_day * 360 - 90);
 636                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 637                 }
 638         } else {
 639                 driver->setMaterial(m_materials[3]);
 640                 float d = (sunsize * 1.7) * m_sun_params.scale;
 641                 video::SColor c;
 642                 if (m_sun_tonemap)
 643                         c = video::SColor(0, 0, 0, 0);
 644                 else
 645                         c = video::SColor(255, 255, 255, 255);
 646                 draw_sky_body(vertices, -d, d, c);
 647                 place_sky_body(vertices, 90, wicked_time_of_day * 360 - 90);
 648                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 649         }
 650 }
 651
 652
 653 void Sky::draw_moon(video::IVideoDriver *driver, float moonsize, const video::SColor &mooncolor,
 654         const video::SColor &mooncolor2, float wicked_time_of_day)
 655 /*
 656         * Draw moon in the sky.
 657         * driver: Video driver object used to draw
 658         * moonsize: the default size of the moon
 659         * mooncolor: main moon color
 660         * mooncolor2: second moon color
 661         * wicked_time_of_day: current time of day, to know where should be the moon in
 662         * the sky
 663         */
 664 {
 665         static const u16 indices[4] = {0, 1, 2, 3};
 666         std::array<video::S3DVertex, 4> vertices;
 667         if (!m_moon_texture) {
 668                 driver->setMaterial(m_materials[1]);
 669                 const float moonsizes_1[4] = {
 670                         (-moonsize * 1.9f) * m_moon_params.scale,
 671                         (-moonsize * 1.3f) * m_moon_params.scale,
 672                         (-moonsize) * m_moon_params.scale,
 673                         (-moonsize) * m_moon_params.scale
 674                 };
 675                 const float moonsizes_2[4] = {
 676                         (moonsize * 1.9f) * m_moon_params.scale,
 677                         (moonsize * 1.3f) * m_moon_params.scale,
 678                         (moonsize) *m_moon_params.scale,
 679                         (moonsize * 0.6f) * m_moon_params.scale
 680                 };
 681                 video::SColor c1 = mooncolor;
 682                 video::SColor c2 = mooncolor;
 683                 c1.setAlpha(0.05 * 255);
 684                 c2.setAlpha(0.15 * 255);
 685                 const video::SColor colors[4] = {c1, c2, mooncolor, mooncolor2};
 686                 for (int i = 0; i < 4; i++) {
 687                         draw_sky_body(vertices, moonsizes_1[i], moonsizes_2[i], colors[i]);
 688                         place_sky_body(vertices, -90, wicked_time_of_day * 360 - 90);
 689                         driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 690                 }
 691         } else {
 692                 driver->setMaterial(m_materials[4]);
 693                 float d = (moonsize * 1.9) * m_moon_params.scale;
 694                 video::SColor c;
 695                 if (m_moon_tonemap)
 696                         c = video::SColor(0, 0, 0, 0);
 697                 else
 698                         c = video::SColor(255, 255, 255, 255);
 699                 draw_sky_body(vertices, -d, d, c);
 700                 place_sky_body(vertices, -90, wicked_time_of_day * 360 - 90);
 701                 driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
 702         }
 703 }
 704
 705 void Sky::draw_stars(video::IVideoDriver * driver, float wicked_time_of_day)
 706 {
 707         driver->setMaterial(m_materials[1]);
 708         // Tune values so that stars first appear just after the sun
 709         // disappears over the horizon, and disappear just before the sun
 710         // appears over the horizon.
 711         // Also tune so that stars are at full brightness from time 20000
 712         // to time 4000.
 713
 714         float tod = wicked_time_of_day < 0.5f ? wicked_time_of_day : (1.0f - wicked_time_of_day);
 715         float starbrightness = clamp((0.25f - fabsf(tod)) * 20.0f, 0.0f, 1.0f);
 716
 717         float f = starbrightness;
 718         float d = (0.006 / 2) * m_star_params.scale;
 719
 720         video::SColor starcolor = m_star_params.starcolor;
 721         starcolor.setAlpha(f * m_star_params.starcolor.getAlpha());
 722
 723         // Stars are only drawn when not fully transparent
 724         if (m_star_params.starcolor.getAlpha() < 1)
 725                 return;
 726 #if ENABLE_GLES
 727         u16 *indices = new u16[m_star_params.count * 3];
 728         video::S3DVertex *vertices =
 729                         new video::S3DVertex[m_star_params.count * 3];
 730         for (u32 i = 0; i < m_star_params.count; i++) {
 731                 indices[i * 3 + 0] = i * 3 + 0;
 732                 indices[i * 3 + 1] = i * 3 + 1;
 733                 indices[i * 3 + 2] = i * 3 + 2;
 734                 v3f r = m_stars[i];
 735                 core::CMatrix4<f32> a;
 736                 a.buildRotateFromTo(v3f(0, 1, 0), r);
 737                 v3f p = v3f(-d, 1, -d);
 738                 v3f p1 = v3f(d, 1, 0);
 739                 v3f p2 = v3f(-d, 1, d);
 740                 a.rotateVect(p);
 741                 a.rotateVect(p1);
 742                 a.rotateVect(p2);
 743                 p.rotateXYBy(wicked_time_of_day * 360 - 90);
 744                 p1.rotateXYBy(wicked_time_of_day * 360 - 90);
 745                 p2.rotateXYBy(wicked_time_of_day * 360 - 90);
 746                 vertices[i * 3 + 0].Pos = p;
 747                 vertices[i * 3 + 0].Color = starcolor;
 748                 vertices[i * 3 + 1].Pos = p1;
 749                 vertices[i * 3 + 1].Color = starcolor;
 750                 vertices[i * 3 + 2].Pos = p2;
 751                 vertices[i * 3 + 2].Color = starcolor;
 752         }
 753         driver->drawIndexedTriangleList(vertices, m_star_params.count * 3,
 754                         indices, m_star_params.count);
 755         delete[] indices;
 756         delete[] vertices;
 757 #else
 758         u16 *indices = new u16[m_star_params.count * 4];
 759         video::S3DVertex *vertices =
 760                         new video::S3DVertex[m_star_params.count * 4];
 761         for (u32 i = 0; i < m_star_params.count; i++) {
 762                 indices[i * 4 + 0] = i * 4 + 0;
 763                 indices[i * 4 + 1] = i * 4 + 1;
 764                 indices[i * 4 + 2] = i * 4 + 2;
 765                 indices[i * 4 + 3] = i * 4 + 3;
 766                 v3f r = m_stars[i];
 767                 core::CMatrix4<f32> a;
 768                 a.buildRotateFromTo(v3f(0, 1, 0), r);
 769                 v3f p = v3f(-d, 1, -d);
 770                 v3f p1 = v3f(d, 1, -d);
 771                 v3f p2 = v3f(d, 1, d);
 772                 v3f p3 = v3f(-d, 1, d);
 773                 a.rotateVect(p);
 774                 a.rotateVect(p1);
 775                 a.rotateVect(p2);
 776                 a.rotateVect(p3);
 777                 p.rotateXYBy(wicked_time_of_day * 360 - 90);
 778                 p1.rotateXYBy(wicked_time_of_day * 360 - 90);
 779                 p2.rotateXYBy(wicked_time_of_day * 360 - 90);
 780                 p3.rotateXYBy(wicked_time_of_day * 360 - 90);
 781                 vertices[i * 4 + 0].Pos = p;
 782                 vertices[i * 4 + 0].Color = starcolor;
 783                 vertices[i * 4 + 1].Pos = p1;
 784                 vertices[i * 4 + 1].Color = starcolor;
 785                 vertices[i * 4 + 2].Pos = p2;
 786                 vertices[i * 4 + 2].Color = starcolor;
 787                 vertices[i * 4 + 3].Pos = p3;
 788                 vertices[i * 4 + 3].Color = starcolor;
 789         }
 790         driver->drawVertexPrimitiveList(vertices, m_star_params.count * 4,
 791                         indices, m_star_params.count, video::EVT_STANDARD,
 792                         scene::EPT_QUADS, video::EIT_16BIT);
 793         delete[] indices;
 794         delete[] vertices;
 795 #endif
 796 }
 797
 798 void Sky::draw_sky_body(std::array<video::S3DVertex, 4> &vertices, float pos_1, float pos_2, const video::SColor &c)
 799 {
 800         /*
 801         * Create an array of vertices with the dimensions specified.
 802         * pos_1, pos_2: position of the body's vertices
 803         * c: color of the body
 804         */
 805
 806         const f32 t = 1.0f;
 807         const f32 o = 0.0f;
 808         vertices[0] = video::S3DVertex(pos_1, pos_1, -1, 0, 0, 1, c, t, t);
 809         vertices[1] = video::S3DVertex(pos_2, pos_1, -1, 0, 0, 1, c, o, t);
 810         vertices[2] = video::S3DVertex(pos_2, pos_2, -1, 0, 0, 1, c, o, o);
 811         vertices[3] = video::S3DVertex(pos_1, pos_2, -1, 0, 0, 1, c, t, o);
 812 }
 813
 814
 815 void Sky::place_sky_body(
 816         std::array<video::S3DVertex, 4> &vertices, float horizon_position, float day_position)
 817         /*
 818         * Place body in the sky.
 819         * vertices: The body as a rectangle of 4 vertices
 820         * horizon_position: turn the body around the Y axis
 821         * day_position: turn the body around the Z axis, to place it depending of the time of the day
 822         */
 823 {
 824         for (video::S3DVertex &vertex : vertices) {
 825                 // Body is directed to -Z (south) by default
 826                 vertex.Pos.rotateXZBy(horizon_position);
 827                 vertex.Pos.rotateXYBy(day_position);
 828         }
 829 }
 830
 831 void Sky::setSunTexture(std::string sun_texture,
 832                 std::string sun_tonemap, ITextureSource *tsrc)
 833 {
 834         // Ignore matching textures (with modifiers) entirely,
 835         // but lets at least update the tonemap before hand.
 836         m_sun_params.tonemap = sun_tonemap;
 837         m_sun_tonemap = tsrc->isKnownSourceImage(m_sun_params.tonemap) ?
 838                 tsrc->getTexture(m_sun_params.tonemap) : NULL;
 839         m_materials[3].Lighting = !!m_sun_tonemap;
 840
 841         if (m_sun_params.texture == sun_texture)
 842                 return;
 843         m_sun_params.texture = sun_texture;
 844
 845         if (sun_texture != "") {
 846                 // We want to ensure the texture exists first.
 847                 m_sun_texture = tsrc->getTextureForMesh(m_sun_params.texture);
 848
 849                 if (m_sun_texture) {
 850                         m_materials[3] = m_materials[0];
 851                         m_materials[3].setTexture(0, m_sun_texture);
 852                         m_materials[3].MaterialType = video::
 853                                 EMT_TRANSPARENT_ALPHA_CHANNEL;
 854                         // Disables texture filtering
 855                         m_materials[3].setFlag(
 856                                 video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
 857                         m_materials[3].setFlag(
 858                                 video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
 859                         m_materials[3].setFlag(
 860                                 video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
 861                 }
 862         } else {
 863                 m_sun_texture = nullptr;
 864         }
 865 }
 866
 867 void Sky::setSunriseTexture(std::string sunglow_texture,
 868                 ITextureSource* tsrc)
 869 {
 870         // Ignore matching textures (with modifiers) entirely.
 871         if (m_sun_params.sunrise == sunglow_texture)
 872                 return;
 873         m_sun_params.sunrise = sunglow_texture;
 874         m_materials[2].setTexture(0, tsrc->getTextureForMesh(
 875                 sunglow_texture.empty() ? "sunrisebg.png" : sunglow_texture)
 876         );
 877 }
 878
 879 void Sky::setMoonTexture(std::string moon_texture,
 880                 std::string moon_tonemap, ITextureSource *tsrc)
 881 {
 882         // Ignore matching textures (with modifiers) entirely,
 883         // but lets at least update the tonemap before hand.
 884         m_moon_params.tonemap = moon_tonemap;
 885         m_moon_tonemap = tsrc->isKnownSourceImage(m_moon_params.tonemap) ?
 886                 tsrc->getTexture(m_moon_params.tonemap) : NULL;
 887         m_materials[4].Lighting = !!m_moon_tonemap;
 888
 889         if (m_moon_params.texture == moon_texture)
 890                 return;
 891         m_moon_params.texture = moon_texture;
 892
 893         if (moon_texture != "") {
 894                 // We want to ensure the texture exists first.
 895                 m_moon_texture = tsrc->getTextureForMesh(m_moon_params.texture);
 896
 897                 if (m_moon_texture) {
 898                         m_materials[4] = m_materials[0];
 899                         m_materials[4].setTexture(0, m_moon_texture);
 900                         m_materials[4].MaterialType = video::
 901                                 EMT_TRANSPARENT_ALPHA_CHANNEL;
 902                         // Disables texture filtering
 903                         m_materials[4].setFlag(
 904                                 video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
 905                         m_materials[4].setFlag(
 906                                 video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
 907                         m_materials[4].setFlag(
 908                                 video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
 909                 }
 910         } else {
 911                 m_moon_texture = nullptr;
 912         }
 913 }
 914
 915 void Sky::setStarCount(u16 star_count, bool force_update)
 916 {
 917         // Allow force updating star count at game init.
 918         if (m_star_params.count != star_count || force_update) {
 919                 m_star_params.count = star_count;
 920                 m_stars.clear();
 921                 // Rebuild the stars surrounding the camera
 922                 for (u16 i = 0; i < star_count; i++) {
 923                         v3f star = v3f(
 924                                 myrand_range(-10000, 10000),
 925                                 myrand_range(-10000, 10000),
 926                                 myrand_range(-10000, 10000)
 927                         );
 928
 929                         star.normalize();
 930                         m_stars.emplace_back(star);
 931                 }
 932         }
 933 }
 934
 935 void Sky::setSkyColors(const SkyboxParams sky)
 936 {
 937         m_sky_params.sky_color = sky.sky_color;
 938 }
 939
 940 void Sky::setHorizonTint(video::SColor sun_tint, video::SColor moon_tint,
 941                 std::string use_sun_tint)
 942 {
 943         // Change sun and moon tinting:
 944         m_sky_params.fog_sun_tint = sun_tint;
 945         m_sky_params.fog_moon_tint = moon_tint;
 946         // Faster than comparing strings every rendering frame
 947         if (use_sun_tint == "default")
 948                 m_default_tint = true;
 949         else if (use_sun_tint == "custom")
 950                 m_default_tint = false;
 951         else
 952                 m_default_tint = true;
 953 }
 954
 955 void Sky::addTextureToSkybox(std::string texture, int material_id,
 956                 ITextureSource *tsrc)
 957 {
 958         // Sanity check for more than six textures.
 959         if (material_id + 5 >= SKY_MATERIAL_COUNT)
 960                 return;
 961         // Keep a list of texture names handy.
 962         m_sky_params.textures.emplace_back(texture);
 963         video::ITexture *result = tsrc->getTextureForMesh(texture);
 964         m_materials[material_id+5] = m_materials[0];
 965         m_materials[material_id+5].setTexture(0, result);
 966         m_materials[material_id+5].MaterialType = video::EMT_SOLID;
 967 }
 968
 969 // To be called once at game init to setup default values.
 970 void Sky::setSkyDefaults()
 971 {
 972         SkyboxDefaults sky_defaults;
 973         m_sky_params.sky_color = sky_defaults.getSkyColorDefaults();
 974         m_sun_params = sky_defaults.getSunDefaults();
 975         m_moon_params = sky_defaults.getMoonDefaults();
 976         m_star_params = sky_defaults.getStarDefaults();
 977 }