src/client/sky.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4 Copyright (C) 2020 numzero, Lobachevskiy Vitaliy <numzer0@yandex.ru>
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU Lesser General Public License as published by
   8 the Free Software Foundation; either version 2.1 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU Lesser General Public License for more details.
  15
  16 You should have received a copy of the GNU Lesser General Public License along
  17 with this program; if not, write to the Free Software Foundation, Inc.,
  18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19 */
  20
  21 #include "sky.h"
  22 #include "ITexture.h"
  23 #include "IVideoDriver.h"
  24 #include "ISceneManager.h"
  25 #include "ICameraSceneNode.h"
  26 #include "S3DVertex.h"
  27 #include "client/tile.h"
  28 #include "noise.h" // easeCurve
  29 #include "profiler.h"
  30 #include "util/numeric.h"
  31 #include <cmath>
  32 #include "client/renderingengine.h"
  33 #include "settings.h"
  34 #include "camera.h" // CameraModes
  35 #include "config.h"
  36 using namespace irr::core;
  37
  38 static video::SMaterial baseMaterial()
  39 {
  40         video::SMaterial mat;
  41         mat.Lighting = false;
  42 #if IRRLICHT_VERSION_MAJOR == 1 && IRRLICHT_VERSION_MINOR > 8
  43         mat.ZBuffer = video::ECFN_DISABLED;
  44         mat.ZWriteEnable = video::EZW_OFF;
  45 #else
  46         mat.ZWriteEnable = false;
  47         mat.ZBuffer = video::ECFN_NEVER;
  48 #endif
  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         return mat;
  54 };
  55
  56 Sky::Sky(s32 id, ITextureSource *tsrc, IShaderSource *ssrc) :
  57                 scene::ISceneNode(RenderingEngine::get_scene_manager()->getRootSceneNode(),
  58                         RenderingEngine::get_scene_manager(), id)
  59 {
  60         setAutomaticCulling(scene::EAC_OFF);
  61         m_box.MaxEdge.set(0, 0, 0);
  62         m_box.MinEdge.set(0, 0, 0);
  63
  64         m_enable_shaders = g_settings->getBool("enable_shaders");
  65
  66         // Create materials
  67
  68         m_materials[0] = baseMaterial();
  69         m_materials[0].MaterialType = ssrc->getShaderInfo(ssrc->getShader("stars_shader", TILE_MATERIAL_ALPHA)).material;
  70         m_materials[0].Lighting = true;
  71         m_materials[0].ColorMaterial = video::ECM_NONE;
  72
  73         m_materials[1] = baseMaterial();
  74         //m_materials[1].MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  75         m_materials[1].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  76
  77         m_materials[2] = baseMaterial();
  78         m_materials[2].setTexture(0, tsrc->getTextureForMesh("sunrisebg.png"));
  79         m_materials[2].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  80         //m_materials[2].MaterialType = video::EMT_TRANSPARENT_ADD_COLOR;
  81
  82         // Ensures that sun and moon textures and tonemaps are correct.
  83         setSkyDefaults();
  84         m_sun_texture = tsrc->isKnownSourceImage(m_sun_params.texture) ?
  85                 tsrc->getTextureForMesh(m_sun_params.texture) : NULL;
  86         m_moon_texture = tsrc->isKnownSourceImage(m_moon_params.texture) ?
  87                 tsrc->getTextureForMesh(m_moon_params.texture) : NULL;
  88         m_sun_tonemap = tsrc->isKnownSourceImage(m_sun_params.tonemap) ?
  89                 tsrc->getTexture(m_sun_params.tonemap) : NULL;
  90         m_moon_tonemap = tsrc->isKnownSourceImage(m_moon_params.tonemap) ?
  91                 tsrc->getTexture(m_moon_params.tonemap) : NULL;
  92
  93         if (m_sun_texture) {
  94                 m_materials[3] = baseMaterial();
  95                 m_materials[3].setTexture(0, m_sun_texture);
  96                 m_materials[3].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  97                 // Disables texture filtering
  98                 m_materials[3].setFlag(video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
  99                 m_materials[3].setFlag(video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
 100                 m_materials[3].setFlag(video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
 101                 // Use tonemaps if available
 102                 if (m_sun_tonemap)
 103                         m_materials[3].Lighting = true;
 104         }
 105         if (m_moon_texture) {
 106                 m_materials[4] = baseMaterial();
 107                 m_materials[4].setTexture(0, m_moon_texture);
 108                 m_materials[4].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 109                 // Disables texture filtering
 110                 m_materials[4].setFlag(video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
 111                 m_materials[4].setFlag(video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
 112                 m_materials[4].setFlag(video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
 113                 // Use tonemaps if available
 114                 if (m_moon_tonemap)
 115                         m_materials[4].Lighting = true;
 116         }
 117
 118         for (int i = 5; i < 11; i++) {
 119                 m_materials[i] = baseMaterial();
 120                 m_materials[i].Lighting = true;
 121                 m_materials[i].MaterialType = video::EMT_SOLID;
 122         }
 123         m_directional_colored_fog = g_settings->getBool("directional_colored_fog");
 124         setStarCount(1000, true);
 125 }
 126
 127 void Sky::OnRegisterSceneNode()
 128 {
 129         if (IsVisible)
 130                 SceneManager->registerNodeForRendering(this, scene::ESNRP_SKY_BOX);
 131
 132         scene::ISceneNode::OnRegisterSceneNode();
 133 }
 134
 135 void Sky::render()
 136 {
 137         video::IVideoDriver *driver = SceneManager->getVideoDriver();
 138         scene::ICameraSceneNode *camera = SceneManager->getActiveCamera();
 139
 140         if (!camera || !driver)
 141                 return;
 142
 143         ScopeProfiler sp(g_profiler, "Sky::render()", SPT_AVG);
 144
 145         // Draw perspective skybox
 146
 147         core::matrix4 translate(AbsoluteTransformation);
 148         translate.setTranslation(camera->getAbsolutePosition());
 149
 150         // Draw the sky box between the near and far clip plane
 151         const f32 viewDistance = (camera->getNearValue() + camera->getFarValue()) * 0.5f;
 152         core::matrix4 scale;
 153         scale.setScale(core::vector3df(viewDistance, viewDistance, viewDistance));
 154
 155         driver->setTransform(video::ETS_WORLD, translate * scale);
 156
 157         if (m_sunlight_seen) {
 158                 float sunsize = 0.07;
 159                 video::SColorf suncolor_f(1, 1, 0, 1);
 160                 //suncolor_f.r = 1;
 161                 //suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.7 + m_time_brightness * 0.5));
 162                 //suncolor_f.b = MYMAX(0.0, m_brightness * 0.95);
 163                 video::SColorf suncolor2_f(1, 1, 1, 1);
 164                 // The values below were probably meant to be suncolor2_f instead of a
 165                 // reassignment of suncolor_f. However, the resulting colour was chosen
 166                 // and is our long-running classic colour. So preserve, but comment-out
 167                 // the unnecessary first assignments above.
 168                 suncolor_f.r = 1;
 169                 suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.85 + m_time_brightness * 0.5));
 170                 suncolor_f.b = MYMAX(0.0, m_brightness);
 171
 172                 float moonsize = 0.04;
 173                 video::SColorf mooncolor_f(0.50, 0.57, 0.65, 1);
 174                 video::SColorf mooncolor2_f(0.85, 0.875, 0.9, 1);
 175
 176                 float nightlength = 0.415;
 177                 float wn = nightlength / 2;
 178                 float wicked_time_of_day = 0;
 179                 if (m_time_of_day > wn && m_time_of_day < 1.0 - wn)
 180                         wicked_time_of_day = (m_time_of_day - wn) / (1.0 - wn * 2) * 0.5 + 0.25;
 181                 else if (m_time_of_day < 0.5)
 182                         wicked_time_of_day = m_time_of_day / wn * 0.25;
 183                 else
 184                         wicked_time_of_day = 1.0 - ((1.0 - m_time_of_day) / wn * 0.25);
 185                 /*std::cerr<<"time_of_day="<<m_time_of_day<<" -> "
 186                                 <<"wicked_time_of_day="<<wicked_time_of_day<<std::endl;*/
 187
 188                 video::SColor suncolor = suncolor_f.toSColor();
 189                 video::SColor suncolor2 = suncolor2_f.toSColor();
 190                 video::SColor mooncolor = mooncolor_f.toSColor();
 191                 video::SColor mooncolor2 = mooncolor2_f.toSColor();
 192
 193                 // Calculate offset normalized to the X dimension of a 512x1 px tonemap
 194                 float offset = (1.0 - fabs(sin((m_time_of_day - 0.5) * irr::core::PI))) * 511;
 195
 196                 if (m_sun_tonemap) {
 197                         u8 * texels = (u8 *)m_sun_tonemap->lock();
 198                         video::SColor* texel = (video::SColor *)(texels + (u32)offset * 4);
 199                         video::SColor texel_color (255, texel->getRed(),
 200                                 texel->getGreen(), texel->getBlue());
 201                         m_sun_tonemap->unlock();
 202                         m_materials[3].EmissiveColor = texel_color;
 203                 }
 204
 205                 if (m_moon_tonemap) {
 206                         u8 * texels = (u8 *)m_moon_tonemap->lock();
 207                         video::SColor* texel = (video::SColor *)(texels + (u32)offset * 4);
 208                         video::SColor texel_color (255, texel->getRed(),
 209                                 texel->getGreen(), texel->getBlue());
 210                         m_moon_tonemap->unlock();
 211                         m_materials[4].EmissiveColor = texel_color;
 212                 }
 213
 214                 const f32 t = 1.0f;
 215                 const f32 o = 0.0f;
 216                 static const u16 indices[6] = {0, 1, 2, 0, 2, 3};
 217                 video::S3DVertex vertices[4];
 218
 219                 driver->setMaterial(m_materials[1]);
 220
 221                 video::SColor cloudyfogcolor = m_bgcolor;
 222
 223                 // Abort rendering if we're in the clouds.
 224                 // Stops rendering a pure white hole in the bottom of the skybox.
 225                 if (m_in_clouds)
 226                         return;
 227
 228                 // Draw the six sided skybox,
 229                 if (m_sky_params.textures.size() == 6) {
 230                         for (u32 j = 5; j < 11; j++) {
 231                                 video::SColor c(255, 255, 255, 255);
 232                                 driver->setMaterial(m_materials[j]);
 233                                 // Use 1.05 rather than 1.0 to avoid colliding with the
 234                                 // sun, moon and stars, as this is a background skybox.
 235                                 vertices[0] = video::S3DVertex(-1.05, -1.05, -1.05, 0, 0, 1, c, t, t);
 236                                 vertices[1] = video::S3DVertex( 1.05, -1.05, -1.05, 0, 0, 1, c, o, t);
 237                                 vertices[2] = video::S3DVertex( 1.05,  1.05, -1.05, 0, 0, 1, c, o, o);
 238                                 vertices[3] = video::S3DVertex(-1.05,  1.05, -1.05, 0, 0, 1, c, t, o);
 239                                 for (video::S3DVertex &vertex : vertices) {
 240                                         if (j == 5) { // Top texture
 241                                                 vertex.Pos.rotateYZBy(90);
 242                                                 vertex.Pos.rotateXZBy(90);
 243                                         } else if (j == 6) { // Bottom texture
 244                                                 vertex.Pos.rotateYZBy(-90);
 245                                                 vertex.Pos.rotateXZBy(90);
 246                                         } else if (j == 7) { // Left texture
 247                                                 vertex.Pos.rotateXZBy(90);
 248                                         } else if (j == 8) { // Right texture
 249                                                 vertex.Pos.rotateXZBy(-90);
 250                                         } else if (j == 9) { // Front texture, do nothing
 251                                                 // Irrlicht doesn't like it when vertexes are left
 252                                                 // alone and not rotated for some reason.
 253                                                 vertex.Pos.rotateXZBy(0);
 254                                         } else {// Back texture
 255                                                 vertex.Pos.rotateXZBy(180);
 256                                         }
 257                                 }
 258                                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 259                         }
 260                 }
 261
 262                 // Draw far cloudy fog thing blended with skycolor
 263                 if (m_visible) {
 264                         driver->setMaterial(m_materials[1]);
 265                         for (u32 j = 0; j < 4; j++) {
 266                                 vertices[0] = video::S3DVertex(-1, -0.02, -1, 0, 0, 1, m_bgcolor, t, t);
 267                                 vertices[1] = video::S3DVertex( 1, -0.02, -1, 0, 0, 1, m_bgcolor, o, t);
 268                                 vertices[2] = video::S3DVertex( 1, 0.45, -1, 0, 0, 1, m_skycolor, o, o);
 269                                 vertices[3] = video::S3DVertex(-1, 0.45, -1, 0, 0, 1, m_skycolor, t, o);
 270                                 for (video::S3DVertex &vertex : vertices) {
 271                                         if (j == 0)
 272                                                 // Don't switch
 273                                                 {}
 274                                         else if (j == 1)
 275                                                 // Switch from -Z (south) to +X (east)
 276                                                 vertex.Pos.rotateXZBy(90);
 277                                         else if (j == 2)
 278                                                 // Switch from -Z (south) to -X (west)
 279                                                 vertex.Pos.rotateXZBy(-90);
 280                                         else
 281                                                 // Switch from -Z (south) to +Z (north)
 282                                                 vertex.Pos.rotateXZBy(-180);
 283                                 }
 284                                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 285                         }
 286                 }
 287
 288                 // Draw stars before sun and moon to be behind them
 289                 if (m_star_params.visible)
 290                         draw_stars(driver, wicked_time_of_day);
 291
 292                 // Draw sunrise/sunset horizon glow texture
 293                 // (textures/base/pack/sunrisebg.png)
 294                 if (m_sun_params.sunrise_visible) {
 295                         driver->setMaterial(m_materials[2]);
 296                         float mid1 = 0.25;
 297                         float mid = wicked_time_of_day < 0.5 ? mid1 : (1.0 - mid1);
 298                         float a_ = 1.0f - std::fabs(wicked_time_of_day - mid) * 35.0f;
 299                         float a = easeCurve(MYMAX(0, MYMIN(1, a_)));
 300                         //std::cerr<<"a_="<<a_<<" a="<<a<<std::endl;
 301                         video::SColor c(255, 255, 255, 255);
 302                         float y = -(1.0 - a) * 0.22;
 303                         vertices[0] = video::S3DVertex(-1, -0.05 + y, -1, 0, 0, 1, c, t, t);
 304                         vertices[1] = video::S3DVertex( 1, -0.05 + y, -1, 0, 0, 1, c, o, t);
 305                         vertices[2] = video::S3DVertex( 1,   0.2 + y, -1, 0, 0, 1, c, o, o);
 306                         vertices[3] = video::S3DVertex(-1,   0.2 + y, -1, 0, 0, 1, c, t, o);
 307                         for (video::S3DVertex &vertex : vertices) {
 308                                 if (wicked_time_of_day < 0.5)
 309                                         // Switch from -Z (south) to +X (east)
 310                                         vertex.Pos.rotateXZBy(90);
 311                                 else
 312                                         // Switch from -Z (south) to -X (west)
 313                                         vertex.Pos.rotateXZBy(-90);
 314                         }
 315                         driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 316                 }
 317
 318                 // Draw sun
 319                 if (m_sun_params.visible)
 320                         draw_sun(driver, sunsize, suncolor, suncolor2, wicked_time_of_day);
 321
 322                 // Draw moon
 323                 if (m_moon_params.visible)
 324                         draw_moon(driver, moonsize, mooncolor, mooncolor2, wicked_time_of_day);
 325
 326                 // Draw far cloudy fog thing below all horizons in front of sun, moon
 327                 // and stars.
 328                 if (m_visible) {
 329                         driver->setMaterial(m_materials[1]);
 330
 331                         for (u32 j = 0; j < 4; j++) {
 332                                 video::SColor c = cloudyfogcolor;
 333                                 vertices[0] = video::S3DVertex(-1, -1.0,  -1, 0, 0, 1, c, t, t);
 334                                 vertices[1] = video::S3DVertex( 1, -1.0,  -1, 0, 0, 1, c, o, t);
 335                                 vertices[2] = video::S3DVertex( 1, -0.02, -1, 0, 0, 1, c, o, o);
 336                                 vertices[3] = video::S3DVertex(-1, -0.02, -1, 0, 0, 1, c, t, o);
 337                                 for (video::S3DVertex &vertex : vertices) {
 338                                         if (j == 0)
 339                                                 // Don't switch
 340                                                 {}
 341                                         else if (j == 1)
 342                                                 // Switch from -Z (south) to +X (east)
 343                                                 vertex.Pos.rotateXZBy(90);
 344                                         else if (j == 2)
 345                                                 // Switch from -Z (south) to -X (west)
 346                                                 vertex.Pos.rotateXZBy(-90);
 347                                         else
 348                                                 // Switch from -Z (south) to +Z (north)
 349                                                 vertex.Pos.rotateXZBy(-180);
 350                                 }
 351                                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 352                         }
 353
 354                         // Draw bottom far cloudy fog thing in front of sun, moon and stars
 355                         video::SColor c = cloudyfogcolor;
 356                         vertices[0] = video::S3DVertex(-1, -1.0, -1, 0, 1, 0, c, t, t);
 357                         vertices[1] = video::S3DVertex( 1, -1.0, -1, 0, 1, 0, c, o, t);
 358                         vertices[2] = video::S3DVertex( 1, -1.0, 1, 0, 1, 0, c, o, o);
 359                         vertices[3] = video::S3DVertex(-1, -1.0, 1, 0, 1, 0, c, t, o);
 360                         driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 361                 }
 362         }
 363 }
 364
 365 void Sky::update(float time_of_day, float time_brightness,
 366         float direct_brightness, bool sunlight_seen,
 367         CameraMode cam_mode, float yaw, float pitch)
 368 {
 369         // Stabilize initial brightness and color values by flooding updates
 370         if (m_first_update) {
 371                 /*dstream<<"First update with time_of_day="<<time_of_day
 372                                 <<" time_brightness="<<time_brightness
 373                                 <<" direct_brightness="<<direct_brightness
 374                                 <<" sunlight_seen="<<sunlight_seen<<std::endl;*/
 375                 m_first_update = false;
 376                 for (u32 i = 0; i < 100; i++) {
 377                         update(time_of_day, time_brightness, direct_brightness,
 378                                         sunlight_seen, cam_mode, yaw, pitch);
 379                 }
 380                 return;
 381         }
 382
 383         m_time_of_day = time_of_day;
 384         m_time_brightness = time_brightness;
 385         m_sunlight_seen = sunlight_seen;
 386         m_in_clouds = false;
 387
 388         bool is_dawn = (time_brightness >= 0.20 && time_brightness < 0.35);
 389
 390         /*
 391         Development colours
 392
 393         video::SColorf bgcolor_bright_normal_f(170. / 255, 200. / 255, 230. / 255, 1.0);
 394         video::SColorf bgcolor_bright_dawn_f(0.666, 200. / 255 * 0.7, 230. / 255 * 0.5, 1.0);
 395         video::SColorf bgcolor_bright_dawn_f(0.666, 0.549, 0.220, 1.0);
 396         video::SColorf bgcolor_bright_dawn_f(0.666 * 1.2, 0.549 * 1.0, 0.220 * 1.0, 1.0);
 397         video::SColorf bgcolor_bright_dawn_f(0.666 * 1.2, 0.549 * 1.0, 0.220 * 1.2, 1.0);
 398
 399         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.591, 0.4);
 400         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.65, 0.44);
 401         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.7, 0.5);
 402         */
 403
 404         video::SColorf bgcolor_bright_normal_f = m_sky_params.sky_color.day_horizon;
 405         video::SColorf bgcolor_bright_indoor_f = m_sky_params.sky_color.indoors;
 406         video::SColorf bgcolor_bright_dawn_f = m_sky_params.sky_color.dawn_horizon;
 407         video::SColorf bgcolor_bright_night_f = m_sky_params.sky_color.night_horizon;
 408
 409         video::SColorf skycolor_bright_normal_f = m_sky_params.sky_color.day_sky;
 410         video::SColorf skycolor_bright_dawn_f = m_sky_params.sky_color.dawn_sky;
 411         video::SColorf skycolor_bright_night_f = m_sky_params.sky_color.night_sky;
 412
 413         video::SColorf cloudcolor_bright_normal_f = m_cloudcolor_day_f;
 414         video::SColorf cloudcolor_bright_dawn_f = m_cloudcolor_dawn_f;
 415
 416         float cloud_color_change_fraction = 0.95;
 417         if (sunlight_seen) {
 418                 if (std::fabs(time_brightness - m_brightness) < 0.2f) {
 419                         m_brightness = m_brightness * 0.95 + time_brightness * 0.05;
 420                 } else {
 421                         m_brightness = m_brightness * 0.80 + time_brightness * 0.20;
 422                         cloud_color_change_fraction = 0.0;
 423                 }
 424         } else {
 425                 if (direct_brightness < m_brightness)
 426                         m_brightness = m_brightness * 0.95 + direct_brightness * 0.05;
 427                 else
 428                         m_brightness = m_brightness * 0.98 + direct_brightness * 0.02;
 429         }
 430
 431         m_clouds_visible = true;
 432         float color_change_fraction = 0.98f;
 433         if (sunlight_seen) {
 434                 if (is_dawn) { // Dawn
 435                         m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 436                                 bgcolor_bright_dawn_f, color_change_fraction);
 437                         m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 438                                 skycolor_bright_dawn_f, color_change_fraction);
 439                         m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 440                                 cloudcolor_bright_dawn_f, color_change_fraction);
 441                 } else {
 442                         if (time_brightness < 0.13f) { // Night
 443                                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 444                                         bgcolor_bright_night_f, color_change_fraction);
 445                                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 446                                         skycolor_bright_night_f, color_change_fraction);
 447                         } else { // Day
 448                                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 449                                         bgcolor_bright_normal_f, color_change_fraction);
 450                                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 451                                         skycolor_bright_normal_f, color_change_fraction);
 452                         }
 453
 454                         m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 455                                 cloudcolor_bright_normal_f, color_change_fraction);
 456                 }
 457         } else {
 458                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 459                         bgcolor_bright_indoor_f, color_change_fraction);
 460                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 461                         bgcolor_bright_indoor_f, color_change_fraction);
 462                 m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 463                         cloudcolor_bright_normal_f, color_change_fraction);
 464                 m_clouds_visible = false;
 465         }
 466
 467         video::SColor bgcolor_bright = m_bgcolor_bright_f.toSColor();
 468         m_bgcolor = video::SColor(
 469                 255,
 470                 bgcolor_bright.getRed() * m_brightness,
 471                 bgcolor_bright.getGreen() * m_brightness,
 472                 bgcolor_bright.getBlue() * m_brightness
 473         );
 474
 475         video::SColor skycolor_bright = m_skycolor_bright_f.toSColor();
 476         m_skycolor = video::SColor(
 477                 255,
 478                 skycolor_bright.getRed() * m_brightness,
 479                 skycolor_bright.getGreen() * m_brightness,
 480                 skycolor_bright.getBlue() * m_brightness
 481         );
 482
 483         // Horizon coloring based on sun and moon direction during sunset and sunrise
 484         video::SColor pointcolor = video::SColor(m_bgcolor.getAlpha(), 255, 255, 255);
 485         if (m_directional_colored_fog) {
 486                 if (m_horizon_blend() != 0) {
 487                         // Calculate hemisphere value from yaw, (inverted in third person front view)
 488                         s8 dir_factor = 1;
 489                         if (cam_mode > CAMERA_MODE_THIRD)
 490                                 dir_factor = -1;
 491                         f32 pointcolor_blend = wrapDegrees_0_360(yaw * dir_factor + 90);
 492                         if (pointcolor_blend > 180)
 493                                 pointcolor_blend = 360 - pointcolor_blend;
 494                         pointcolor_blend /= 180;
 495                         // Bound view angle to determine where transition starts and ends
 496                         pointcolor_blend = rangelim(1 - pointcolor_blend * 1.375, 0, 1 / 1.375) *
 497                                 1.375;
 498                         // Combine the colors when looking up or down, otherwise turning looks weird
 499                         pointcolor_blend += (0.5 - pointcolor_blend) *
 500                                 (1 - MYMIN((90 - std::fabs(pitch)) / 90 * 1.5, 1));
 501                         // Invert direction to match where the sun and moon are rising
 502                         if (m_time_of_day > 0.5)
 503                                 pointcolor_blend = 1 - pointcolor_blend;
 504                         // Horizon colors of sun and moon
 505                         f32 pointcolor_light = rangelim(m_time_brightness * 3, 0.2, 1);
 506
 507                         video::SColorf pointcolor_sun_f(1, 1, 1, 1);
 508                         // Use tonemap only if default sun/moon tinting is used
 509                         // which keeps previous behaviour.
 510                         if (m_sun_tonemap && m_default_tint) {
 511                                 pointcolor_sun_f.r = pointcolor_light *
 512                                         (float)m_materials[3].EmissiveColor.getRed() / 255;
 513                                 pointcolor_sun_f.b = pointcolor_light *
 514                                         (float)m_materials[3].EmissiveColor.getBlue() / 255;
 515                                 pointcolor_sun_f.g = pointcolor_light *
 516                                         (float)m_materials[3].EmissiveColor.getGreen() / 255;
 517                         } else if (!m_default_tint) {
 518                                 pointcolor_sun_f = m_sky_params.fog_sun_tint;
 519                         } else {
 520                                 pointcolor_sun_f.r = pointcolor_light * 1;
 521                                 pointcolor_sun_f.b = pointcolor_light *
 522                                         (0.25 + (rangelim(m_time_brightness, 0.25, 0.75) - 0.25) * 2 * 0.75);
 523                                 pointcolor_sun_f.g = pointcolor_light * (pointcolor_sun_f.b * 0.375 +
 524                                         (rangelim(m_time_brightness, 0.05, 0.15) - 0.05) * 10 * 0.625);
 525                         }
 526
 527                         video::SColorf pointcolor_moon_f;
 528                         if (m_default_tint) {
 529                                 pointcolor_moon_f = video::SColorf(
 530                                         0.5 * pointcolor_light,
 531                                         0.6 * pointcolor_light,
 532                                         0.8 * pointcolor_light,
 533                                         1
 534                                 );
 535                         } else {
 536                                 pointcolor_moon_f = video::SColorf(
 537                                         (m_sky_params.fog_moon_tint.getRed() / 255) * pointcolor_light,
 538                                         (m_sky_params.fog_moon_tint.getGreen() / 255) * pointcolor_light,
 539                                         (m_sky_params.fog_moon_tint.getBlue() / 255) * pointcolor_light,
 540                                         1
 541                                 );
 542                         }
 543                         if (m_moon_tonemap && m_default_tint) {
 544                                 pointcolor_moon_f.r = pointcolor_light *
 545                                         (float)m_materials[4].EmissiveColor.getRed() / 255;
 546                                 pointcolor_moon_f.b = pointcolor_light *
 547                                         (float)m_materials[4].EmissiveColor.getBlue() / 255;
 548                                 pointcolor_moon_f.g = pointcolor_light *
 549                                         (float)m_materials[4].EmissiveColor.getGreen() / 255;
 550                         }
 551
 552                         video::SColor pointcolor_sun = pointcolor_sun_f.toSColor();
 553                         video::SColor pointcolor_moon = pointcolor_moon_f.toSColor();
 554                         // Calculate the blend color
 555                         pointcolor = m_mix_scolor(pointcolor_moon, pointcolor_sun, pointcolor_blend);
 556                 }
 557                 m_bgcolor = m_mix_scolor(m_bgcolor, pointcolor, m_horizon_blend() * 0.5);
 558                 m_skycolor = m_mix_scolor(m_skycolor, pointcolor, m_horizon_blend() * 0.25);
 559         }
 560
 561         float cloud_direct_brightness = 0.0f;
 562         if (sunlight_seen) {
 563                 if (!m_directional_colored_fog) {
 564                         cloud_direct_brightness = time_brightness;
 565                         // Boost cloud brightness relative to sky, at dawn, dusk and at night
 566                         if (time_brightness < 0.7f)
 567                                 cloud_direct_brightness *= 1.3f;
 568                 } else {
 569                         cloud_direct_brightness = std::fmin(m_horizon_blend() * 0.15f +
 570                                 m_time_brightness, 1.0f);
 571                         // Set the same minimum cloud brightness at night
 572                         if (time_brightness < 0.5f)
 573                                 cloud_direct_brightness = std::fmax(cloud_direct_brightness,
 574                                         time_brightness * 1.3f);
 575                 }
 576         } else {
 577                 cloud_direct_brightness = direct_brightness;
 578         }
 579
 580         m_cloud_brightness = m_cloud_brightness * cloud_color_change_fraction +
 581                 cloud_direct_brightness * (1.0 - cloud_color_change_fraction);
 582         m_cloudcolor_f = video::SColorf(
 583                 m_cloudcolor_bright_f.r * m_cloud_brightness,
 584                 m_cloudcolor_bright_f.g * m_cloud_brightness,
 585                 m_cloudcolor_bright_f.b * m_cloud_brightness,
 586                 1.0
 587         );
 588         if (m_directional_colored_fog) {
 589                 m_cloudcolor_f = m_mix_scolorf(m_cloudcolor_f,
 590                         video::SColorf(pointcolor), m_horizon_blend() * 0.25);
 591         }
 592 }
 593
 594 void Sky::draw_sun(video::IVideoDriver *driver, float sunsize, const video::SColor &suncolor,
 595         const video::SColor &suncolor2, float wicked_time_of_day)
 596         /* Draw sun in the sky.
 597          * driver: Video driver object used to draw
 598          * sunsize: the default size of the sun
 599          * suncolor: main sun color
 600          * suncolor2: second sun color
 601          * wicked_time_of_day: current time of day, to know where should be the sun in the sky
 602          */
 603 {
 604         static const u16 indices[] = {0, 1, 2, 0, 2, 3};
 605         std::array<video::S3DVertex, 4> vertices;
 606         if (!m_sun_texture) {
 607                 driver->setMaterial(m_materials[1]);
 608                 const float sunsizes[4] = {
 609                         (sunsize * 1.7f) * m_sun_params.scale,
 610                         (sunsize * 1.2f) * m_sun_params.scale,
 611                         (sunsize) * m_sun_params.scale,
 612                         (sunsize * 0.7f) * m_sun_params.scale
 613                 };
 614                 video::SColor c1 = suncolor;
 615                 video::SColor c2 = suncolor;
 616                 c1.setAlpha(0.05 * 255);
 617                 c2.setAlpha(0.15 * 255);
 618                 const video::SColor colors[4] = {c1, c2, suncolor, suncolor2};
 619                 for (int i = 0; i < 4; i++) {
 620                         draw_sky_body(vertices, -sunsizes[i], sunsizes[i], colors[i]);
 621                         place_sky_body(vertices, 90, wicked_time_of_day * 360 - 90);
 622                         driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 623                 }
 624         } else {
 625                 driver->setMaterial(m_materials[3]);
 626                 float d = (sunsize * 1.7) * m_sun_params.scale;
 627                 video::SColor c;
 628                 if (m_sun_tonemap)
 629                         c = video::SColor(0, 0, 0, 0);
 630                 else
 631                         c = video::SColor(255, 255, 255, 255);
 632                 draw_sky_body(vertices, -d, d, c);
 633                 place_sky_body(vertices, 90, wicked_time_of_day * 360 - 90);
 634                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 635         }
 636 }
 637
 638
 639 void Sky::draw_moon(video::IVideoDriver *driver, float moonsize, const video::SColor &mooncolor,
 640         const video::SColor &mooncolor2, float wicked_time_of_day)
 641 /*
 642         * Draw moon in the sky.
 643         * driver: Video driver object used to draw
 644         * moonsize: the default size of the moon
 645         * mooncolor: main moon color
 646         * mooncolor2: second moon color
 647         * wicked_time_of_day: current time of day, to know where should be the moon in
 648         * the sky
 649         */
 650 {
 651         static const u16 indices[] = {0, 1, 2, 0, 2, 3};
 652         std::array<video::S3DVertex, 4> vertices;
 653         if (!m_moon_texture) {
 654                 driver->setMaterial(m_materials[1]);
 655                 const float moonsizes_1[4] = {
 656                         (-moonsize * 1.9f) * m_moon_params.scale,
 657                         (-moonsize * 1.3f) * m_moon_params.scale,
 658                         (-moonsize) * m_moon_params.scale,
 659                         (-moonsize) * m_moon_params.scale
 660                 };
 661                 const float moonsizes_2[4] = {
 662                         (moonsize * 1.9f) * m_moon_params.scale,
 663                         (moonsize * 1.3f) * m_moon_params.scale,
 664                         (moonsize) *m_moon_params.scale,
 665                         (moonsize * 0.6f) * m_moon_params.scale
 666                 };
 667                 video::SColor c1 = mooncolor;
 668                 video::SColor c2 = mooncolor;
 669                 c1.setAlpha(0.05 * 255);
 670                 c2.setAlpha(0.15 * 255);
 671                 const video::SColor colors[4] = {c1, c2, mooncolor, mooncolor2};
 672                 for (int i = 0; i < 4; i++) {
 673                         draw_sky_body(vertices, moonsizes_1[i], moonsizes_2[i], colors[i]);
 674                         place_sky_body(vertices, -90, wicked_time_of_day * 360 - 90);
 675                         driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 676                 }
 677         } else {
 678                 driver->setMaterial(m_materials[4]);
 679                 float d = (moonsize * 1.9) * m_moon_params.scale;
 680                 video::SColor c;
 681                 if (m_moon_tonemap)
 682                         c = video::SColor(0, 0, 0, 0);
 683                 else
 684                         c = video::SColor(255, 255, 255, 255);
 685                 draw_sky_body(vertices, -d, d, c);
 686                 place_sky_body(vertices, -90, wicked_time_of_day * 360 - 90);
 687                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 688         }
 689 }
 690
 691 void Sky::draw_stars(video::IVideoDriver * driver, float wicked_time_of_day)
 692 {
 693         // Tune values so that stars first appear just after the sun
 694         // disappears over the horizon, and disappear just before the sun
 695         // appears over the horizon.
 696         // Also tune so that stars are at full brightness from time 20000
 697         // to time 4000.
 698
 699         float tod = wicked_time_of_day < 0.5f ? wicked_time_of_day : (1.0f - wicked_time_of_day);
 700         float starbrightness = (0.25f - fabsf(tod)) * 20.0f;
 701         m_star_color = m_star_params.starcolor;
 702         m_star_color.a *= clamp(starbrightness, 0.0f, 1.0f);
 703         if (m_star_color.a <= 0.0f) // Stars are only drawn when not fully transparent
 704                 return;
 705         m_materials[0].DiffuseColor = m_materials[0].EmissiveColor = m_star_color.toSColor();
 706         auto sky_rotation = core::matrix4().setRotationAxisRadians(2.0f * M_PI * (wicked_time_of_day - 0.25f), v3f(0.0f, 0.0f, 1.0f));
 707         auto world_matrix = driver->getTransform(video::ETS_WORLD);
 708         driver->setTransform(video::ETS_WORLD, world_matrix * sky_rotation);
 709         driver->setMaterial(m_materials[0]);
 710         driver->drawMeshBuffer(m_stars.get());
 711         driver->setTransform(video::ETS_WORLD, world_matrix);
 712 }
 713
 714 void Sky::draw_sky_body(std::array<video::S3DVertex, 4> &vertices, float pos_1, float pos_2, const video::SColor &c)
 715 {
 716         /*
 717         * Create an array of vertices with the dimensions specified.
 718         * pos_1, pos_2: position of the body's vertices
 719         * c: color of the body
 720         */
 721
 722         const f32 t = 1.0f;
 723         const f32 o = 0.0f;
 724         vertices[0] = video::S3DVertex(pos_1, pos_1, -1, 0, 0, 1, c, t, t);
 725         vertices[1] = video::S3DVertex(pos_2, pos_1, -1, 0, 0, 1, c, o, t);
 726         vertices[2] = video::S3DVertex(pos_2, pos_2, -1, 0, 0, 1, c, o, o);
 727         vertices[3] = video::S3DVertex(pos_1, pos_2, -1, 0, 0, 1, c, t, o);
 728 }
 729
 730
 731 void Sky::place_sky_body(
 732         std::array<video::S3DVertex, 4> &vertices, float horizon_position, float day_position)
 733         /*
 734         * Place body in the sky.
 735         * vertices: The body as a rectangle of 4 vertices
 736         * horizon_position: turn the body around the Y axis
 737         * day_position: turn the body around the Z axis, to place it depending of the time of the day
 738         */
 739 {
 740         for (video::S3DVertex &vertex : vertices) {
 741                 // Body is directed to -Z (south) by default
 742                 vertex.Pos.rotateXZBy(horizon_position);
 743                 vertex.Pos.rotateXYBy(day_position);
 744         }
 745 }
 746
 747 void Sky::setSunTexture(std::string sun_texture,
 748                 std::string sun_tonemap, ITextureSource *tsrc)
 749 {
 750         // Ignore matching textures (with modifiers) entirely,
 751         // but lets at least update the tonemap before hand.
 752         m_sun_params.tonemap = sun_tonemap;
 753         m_sun_tonemap = tsrc->isKnownSourceImage(m_sun_params.tonemap) ?
 754                 tsrc->getTexture(m_sun_params.tonemap) : NULL;
 755         m_materials[3].Lighting = !!m_sun_tonemap;
 756
 757         if (m_sun_params.texture == sun_texture)
 758                 return;
 759         m_sun_params.texture = sun_texture;
 760
 761         if (sun_texture != "") {
 762                 // We want to ensure the texture exists first.
 763                 m_sun_texture = tsrc->getTextureForMesh(m_sun_params.texture);
 764
 765                 if (m_sun_texture) {
 766                         m_materials[3] = baseMaterial();
 767                         m_materials[3].setTexture(0, m_sun_texture);
 768                         m_materials[3].MaterialType = video::
 769                                 EMT_TRANSPARENT_ALPHA_CHANNEL;
 770                         // Disables texture filtering
 771                         m_materials[3].setFlag(
 772                                 video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
 773                         m_materials[3].setFlag(
 774                                 video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
 775                         m_materials[3].setFlag(
 776                                 video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
 777                 }
 778         } else {
 779                 m_sun_texture = nullptr;
 780         }
 781 }
 782
 783 void Sky::setSunriseTexture(std::string sunglow_texture,
 784                 ITextureSource* tsrc)
 785 {
 786         // Ignore matching textures (with modifiers) entirely.
 787         if (m_sun_params.sunrise == sunglow_texture)
 788                 return;
 789         m_sun_params.sunrise = sunglow_texture;
 790         m_materials[2].setTexture(0, tsrc->getTextureForMesh(
 791                 sunglow_texture.empty() ? "sunrisebg.png" : sunglow_texture)
 792         );
 793 }
 794
 795 void Sky::setMoonTexture(std::string moon_texture,
 796                 std::string moon_tonemap, ITextureSource *tsrc)
 797 {
 798         // Ignore matching textures (with modifiers) entirely,
 799         // but lets at least update the tonemap before hand.
 800         m_moon_params.tonemap = moon_tonemap;
 801         m_moon_tonemap = tsrc->isKnownSourceImage(m_moon_params.tonemap) ?
 802                 tsrc->getTexture(m_moon_params.tonemap) : NULL;
 803         m_materials[4].Lighting = !!m_moon_tonemap;
 804
 805         if (m_moon_params.texture == moon_texture)
 806                 return;
 807         m_moon_params.texture = moon_texture;
 808
 809         if (moon_texture != "") {
 810                 // We want to ensure the texture exists first.
 811                 m_moon_texture = tsrc->getTextureForMesh(m_moon_params.texture);
 812
 813                 if (m_moon_texture) {
 814                         m_materials[4] = baseMaterial();
 815                         m_materials[4].setTexture(0, m_moon_texture);
 816                         m_materials[4].MaterialType = video::
 817                                 EMT_TRANSPARENT_ALPHA_CHANNEL;
 818                         // Disables texture filtering
 819                         m_materials[4].setFlag(
 820                                 video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
 821                         m_materials[4].setFlag(
 822                                 video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
 823                         m_materials[4].setFlag(
 824                                 video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
 825                 }
 826         } else {
 827                 m_moon_texture = nullptr;
 828         }
 829 }
 830
 831 void Sky::setStarCount(u16 star_count, bool force_update)
 832 {
 833         // Allow force updating star count at game init.
 834         if (m_star_params.count != star_count || force_update) {
 835                 m_star_params.count = star_count;
 836                 m_seed = (u64)myrand() << 32 | myrand();
 837                 updateStars();
 838         }
 839 }
 840
 841 void Sky::updateStars()
 842 {
 843         m_stars.reset(new scene::SMeshBuffer());
 844         // Stupid IrrLicht doesn’t allow non-indexed rendering, and indexed quad
 845         // rendering is slow due to lack of hardware support. So as indices are
 846         // 16-bit and there are 4 vertices per star... the limit is 2^16/4 = 0x4000.
 847         // That should be well enough actually.
 848         if (m_star_params.count > 0x4000) {
 849                 warningstream << "Requested " << m_star_params.count << " stars but " << 0x4000 << " is the max\n";
 850                 m_star_params.count = 0x4000;
 851         }
 852         m_stars->Vertices.reallocate(4 * m_star_params.count);
 853         m_stars->Indices.reallocate(6 * m_star_params.count);
 854
 855         video::SColor fallback_color = m_star_params.starcolor; // used on GLES 2 “without shaders”
 856         PcgRandom rgen(m_seed);
 857         float d = (0.006 / 2) * m_star_params.scale;
 858         for (u16 i = 0; i < m_star_params.count; i++) {
 859                 v3f r = v3f(
 860                         rgen.range(-10000, 10000),
 861                         rgen.range(-10000, 10000),
 862                         rgen.range(-10000, 10000)
 863                 );
 864                 core::CMatrix4<f32> a;
 865                 a.buildRotateFromTo(v3f(0, 1, 0), r);
 866                 v3f p = v3f(-d, 1, -d);
 867                 v3f p1 = v3f(d, 1, -d);
 868                 v3f p2 = v3f(d, 1, d);
 869                 v3f p3 = v3f(-d, 1, d);
 870                 a.rotateVect(p);
 871                 a.rotateVect(p1);
 872                 a.rotateVect(p2);
 873                 a.rotateVect(p3);
 874                 m_stars->Vertices.push_back(video::S3DVertex(p, {}, fallback_color, {}));
 875                 m_stars->Vertices.push_back(video::S3DVertex(p1, {}, fallback_color, {}));
 876                 m_stars->Vertices.push_back(video::S3DVertex(p2, {}, fallback_color, {}));
 877                 m_stars->Vertices.push_back(video::S3DVertex(p3, {}, fallback_color, {}));
 878         }
 879         for (u16 i = 0; i < m_star_params.count; i++) {
 880                 m_stars->Indices.push_back(i * 4 + 0);
 881                 m_stars->Indices.push_back(i * 4 + 1);
 882                 m_stars->Indices.push_back(i * 4 + 2);
 883                 m_stars->Indices.push_back(i * 4 + 2);
 884                 m_stars->Indices.push_back(i * 4 + 3);
 885                 m_stars->Indices.push_back(i * 4 + 0);
 886         }
 887         m_stars->setHardwareMappingHint(scene::EHM_STATIC);
 888 }
 889
 890 void Sky::setSkyColors(const SkyColor &sky_color)
 891 {
 892         m_sky_params.sky_color = sky_color;
 893 }
 894
 895 void Sky::setHorizonTint(video::SColor sun_tint, video::SColor moon_tint,
 896                 std::string use_sun_tint)
 897 {
 898         // Change sun and moon tinting:
 899         m_sky_params.fog_sun_tint = sun_tint;
 900         m_sky_params.fog_moon_tint = moon_tint;
 901         // Faster than comparing strings every rendering frame
 902         if (use_sun_tint == "default")
 903                 m_default_tint = true;
 904         else if (use_sun_tint == "custom")
 905                 m_default_tint = false;
 906         else
 907                 m_default_tint = true;
 908 }
 909
 910 void Sky::addTextureToSkybox(std::string texture, int material_id,
 911                 ITextureSource *tsrc)
 912 {
 913         // Sanity check for more than six textures.
 914         if (material_id + 5 >= SKY_MATERIAL_COUNT)
 915                 return;
 916         // Keep a list of texture names handy.
 917         m_sky_params.textures.emplace_back(texture);
 918         video::ITexture *result = tsrc->getTextureForMesh(texture);
 919         m_materials[material_id+5] = baseMaterial();
 920         m_materials[material_id+5].setTexture(0, result);
 921         m_materials[material_id+5].MaterialType = video::EMT_SOLID;
 922 }
 923
 924 // To be called once at game init to setup default values.
 925 void Sky::setSkyDefaults()
 926 {
 927         SkyboxDefaults sky_defaults;
 928         m_sky_params.sky_color = sky_defaults.getSkyColorDefaults();
 929         m_sun_params = sky_defaults.getSunDefaults();
 930         m_moon_params = sky_defaults.getMoonDefaults();
 931         m_star_params = sky_defaults.getStarDefaults();
 932 }