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 ENABLE_GLES
  43         mat.ZBuffer = video::ECFN_DISABLED;
  44 #else
  45         mat.ZBuffer = video::ECFN_NEVER;
  46 #endif
  47         mat.ZWriteEnable = false;
  48         mat.AntiAliasing = 0;
  49         mat.TextureLayer[0].TextureWrapU = video::ETC_CLAMP_TO_EDGE;
  50         mat.TextureLayer[0].TextureWrapV = video::ETC_CLAMP_TO_EDGE;
  51         mat.BackfaceCulling = false;
  52         return mat;
  53 };
  54
  55 Sky::Sky(s32 id, ITextureSource *tsrc, IShaderSource *ssrc) :
  56                 scene::ISceneNode(RenderingEngine::get_scene_manager()->getRootSceneNode(),
  57                         RenderingEngine::get_scene_manager(), id)
  58 {
  59         setAutomaticCulling(scene::EAC_OFF);
  60         m_box.MaxEdge.set(0, 0, 0);
  61         m_box.MinEdge.set(0, 0, 0);
  62
  63         m_enable_shaders = g_settings->getBool("enable_shaders");
  64
  65         // Create materials
  66
  67         m_materials[0] = baseMaterial();
  68         m_materials[0].MaterialType = ssrc->getShaderInfo(ssrc->getShader("stars_shader", TILE_MATERIAL_ALPHA)).material;
  69         m_materials[0].Lighting = true;
  70         m_materials[0].ColorMaterial = video::ECM_NONE;
  71
  72         m_materials[1] = baseMaterial();
  73         //m_materials[1].MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  74         m_materials[1].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  75
  76         m_materials[2] = baseMaterial();
  77         m_materials[2].setTexture(0, tsrc->getTextureForMesh("sunrisebg.png"));
  78         m_materials[2].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  79         //m_materials[2].MaterialType = video::EMT_TRANSPARENT_ADD_COLOR;
  80
  81         // Ensures that sun and moon textures and tonemaps are correct.
  82         setSkyDefaults();
  83         m_sun_texture = tsrc->isKnownSourceImage(m_sun_params.texture) ?
  84                 tsrc->getTextureForMesh(m_sun_params.texture) : NULL;
  85         m_moon_texture = tsrc->isKnownSourceImage(m_moon_params.texture) ?
  86                 tsrc->getTextureForMesh(m_moon_params.texture) : NULL;
  87         m_sun_tonemap = tsrc->isKnownSourceImage(m_sun_params.tonemap) ?
  88                 tsrc->getTexture(m_sun_params.tonemap) : NULL;
  89         m_moon_tonemap = tsrc->isKnownSourceImage(m_moon_params.tonemap) ?
  90                 tsrc->getTexture(m_moon_params.tonemap) : NULL;
  91
  92         if (m_sun_texture) {
  93                 m_materials[3] = baseMaterial();
  94                 m_materials[3].setTexture(0, m_sun_texture);
  95                 m_materials[3].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  96                 // Disables texture filtering
  97                 m_materials[3].setFlag(video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
  98                 m_materials[3].setFlag(video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
  99                 m_materials[3].setFlag(video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
 100                 // Use tonemaps if available
 101                 if (m_sun_tonemap)
 102                         m_materials[3].Lighting = true;
 103         }
 104         if (m_moon_texture) {
 105                 m_materials[4] = baseMaterial();
 106                 m_materials[4].setTexture(0, m_moon_texture);
 107                 m_materials[4].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 108                 // Disables texture filtering
 109                 m_materials[4].setFlag(video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
 110                 m_materials[4].setFlag(video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
 111                 m_materials[4].setFlag(video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
 112                 // Use tonemaps if available
 113                 if (m_moon_tonemap)
 114                         m_materials[4].Lighting = true;
 115         }
 116
 117         for (int i = 5; i < 11; i++) {
 118                 m_materials[i] = baseMaterial();
 119                 m_materials[i].Lighting = true;
 120                 m_materials[i].MaterialType = video::EMT_SOLID;
 121         }
 122         m_directional_colored_fog = g_settings->getBool("directional_colored_fog");
 123         setStarCount(1000, true);
 124 }
 125
 126 void Sky::OnRegisterSceneNode()
 127 {
 128         if (IsVisible)
 129                 SceneManager->registerNodeForRendering(this, scene::ESNRP_SKY_BOX);
 130
 131         scene::ISceneNode::OnRegisterSceneNode();
 132 }
 133
 134 void Sky::render()
 135 {
 136         video::IVideoDriver *driver = SceneManager->getVideoDriver();
 137         scene::ICameraSceneNode *camera = SceneManager->getActiveCamera();
 138
 139         if (!camera || !driver)
 140                 return;
 141
 142         ScopeProfiler sp(g_profiler, "Sky::render()", SPT_AVG);
 143
 144         // Draw perspective skybox
 145
 146         core::matrix4 translate(AbsoluteTransformation);
 147         translate.setTranslation(camera->getAbsolutePosition());
 148
 149         // Draw the sky box between the near and far clip plane
 150         const f32 viewDistance = (camera->getNearValue() + camera->getFarValue()) * 0.5f;
 151         core::matrix4 scale;
 152         scale.setScale(core::vector3df(viewDistance, viewDistance, viewDistance));
 153
 154         driver->setTransform(video::ETS_WORLD, translate * scale);
 155
 156         if (m_sunlight_seen) {
 157                 float sunsize = 0.07;
 158                 video::SColorf suncolor_f(1, 1, 0, 1);
 159                 //suncolor_f.r = 1;
 160                 //suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.7 + m_time_brightness * 0.5));
 161                 //suncolor_f.b = MYMAX(0.0, m_brightness * 0.95);
 162                 video::SColorf suncolor2_f(1, 1, 1, 1);
 163                 // The values below were probably meant to be suncolor2_f instead of a
 164                 // reassignment of suncolor_f. However, the resulting colour was chosen
 165                 // and is our long-running classic colour. So preserve, but comment-out
 166                 // the unnecessary first assignments above.
 167                 suncolor_f.r = 1;
 168                 suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.85 + m_time_brightness * 0.5));
 169                 suncolor_f.b = MYMAX(0.0, m_brightness);
 170
 171                 float moonsize = 0.04;
 172                 video::SColorf mooncolor_f(0.50, 0.57, 0.65, 1);
 173                 video::SColorf mooncolor2_f(0.85, 0.875, 0.9, 1);
 174
 175                 float nightlength = 0.415;
 176                 float wn = nightlength / 2;
 177                 float wicked_time_of_day = 0;
 178                 if (m_time_of_day > wn && m_time_of_day < 1.0 - wn)
 179                         wicked_time_of_day = (m_time_of_day - wn) / (1.0 - wn * 2) * 0.5 + 0.25;
 180                 else if (m_time_of_day < 0.5)
 181                         wicked_time_of_day = m_time_of_day / wn * 0.25;
 182                 else
 183                         wicked_time_of_day = 1.0 - ((1.0 - m_time_of_day) / wn * 0.25);
 184                 /*std::cerr<<"time_of_day="<<m_time_of_day<<" -> "
 185                                 <<"wicked_time_of_day="<<wicked_time_of_day<<std::endl;*/
 186
 187                 video::SColor suncolor = suncolor_f.toSColor();
 188                 video::SColor suncolor2 = suncolor2_f.toSColor();
 189                 video::SColor mooncolor = mooncolor_f.toSColor();
 190                 video::SColor mooncolor2 = mooncolor2_f.toSColor();
 191
 192                 // Calculate offset normalized to the X dimension of a 512x1 px tonemap
 193                 float offset = (1.0 - fabs(sin((m_time_of_day - 0.5) * irr::core::PI))) * 511;
 194
 195                 if (m_sun_tonemap) {
 196                         u8 * texels = (u8 *)m_sun_tonemap->lock();
 197                         video::SColor* texel = (video::SColor *)(texels + (u32)offset * 4);
 198                         video::SColor texel_color (255, texel->getRed(),
 199                                 texel->getGreen(), texel->getBlue());
 200                         m_sun_tonemap->unlock();
 201                         m_materials[3].EmissiveColor = texel_color;
 202                 }
 203
 204                 if (m_moon_tonemap) {
 205                         u8 * texels = (u8 *)m_moon_tonemap->lock();
 206                         video::SColor* texel = (video::SColor *)(texels + (u32)offset * 4);
 207                         video::SColor texel_color (255, texel->getRed(),
 208                                 texel->getGreen(), texel->getBlue());
 209                         m_moon_tonemap->unlock();
 210                         m_materials[4].EmissiveColor = texel_color;
 211                 }
 212
 213                 const f32 t = 1.0f;
 214                 const f32 o = 0.0f;
 215                 static const u16 indices[6] = {0, 1, 2, 0, 2, 3};
 216                 video::S3DVertex vertices[4];
 217
 218                 driver->setMaterial(m_materials[1]);
 219
 220                 video::SColor cloudyfogcolor = m_bgcolor;
 221
 222                 // Abort rendering if we're in the clouds.
 223                 // Stops rendering a pure white hole in the bottom of the skybox.
 224                 if (m_in_clouds)
 225                         return;
 226
 227                 // Draw the six sided skybox,
 228                 if (m_sky_params.textures.size() == 6) {
 229                         for (u32 j = 5; j < 11; j++) {
 230                                 video::SColor c(255, 255, 255, 255);
 231                                 driver->setMaterial(m_materials[j]);
 232                                 // Use 1.05 rather than 1.0 to avoid colliding with the
 233                                 // sun, moon and stars, as this is a background skybox.
 234                                 vertices[0] = video::S3DVertex(-1.05, -1.05, -1.05, 0, 0, 1, c, t, t);
 235                                 vertices[1] = video::S3DVertex( 1.05, -1.05, -1.05, 0, 0, 1, c, o, t);
 236                                 vertices[2] = video::S3DVertex( 1.05,  1.05, -1.05, 0, 0, 1, c, o, o);
 237                                 vertices[3] = video::S3DVertex(-1.05,  1.05, -1.05, 0, 0, 1, c, t, o);
 238                                 for (video::S3DVertex &vertex : vertices) {
 239                                         if (j == 5) { // Top texture
 240                                                 vertex.Pos.rotateYZBy(90);
 241                                                 vertex.Pos.rotateXZBy(90);
 242                                         } else if (j == 6) { // Bottom texture
 243                                                 vertex.Pos.rotateYZBy(-90);
 244                                                 vertex.Pos.rotateXZBy(90);
 245                                         } else if (j == 7) { // Left texture
 246                                                 vertex.Pos.rotateXZBy(90);
 247                                         } else if (j == 8) { // Right texture
 248                                                 vertex.Pos.rotateXZBy(-90);
 249                                         } else if (j == 9) { // Front texture, do nothing
 250                                                 // Irrlicht doesn't like it when vertexes are left
 251                                                 // alone and not rotated for some reason.
 252                                                 vertex.Pos.rotateXZBy(0);
 253                                         } else {// Back texture
 254                                                 vertex.Pos.rotateXZBy(180);
 255                                         }
 256                                 }
 257                                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 258                         }
 259                 }
 260
 261                 // Draw far cloudy fog thing blended with skycolor
 262                 if (m_visible) {
 263                         driver->setMaterial(m_materials[1]);
 264                         for (u32 j = 0; j < 4; j++) {
 265                                 vertices[0] = video::S3DVertex(-1, -0.02, -1, 0, 0, 1, m_bgcolor, t, t);
 266                                 vertices[1] = video::S3DVertex( 1, -0.02, -1, 0, 0, 1, m_bgcolor, o, t);
 267                                 vertices[2] = video::S3DVertex( 1, 0.45, -1, 0, 0, 1, m_skycolor, o, o);
 268                                 vertices[3] = video::S3DVertex(-1, 0.45, -1, 0, 0, 1, m_skycolor, t, o);
 269                                 for (video::S3DVertex &vertex : vertices) {
 270                                         if (j == 0)
 271                                                 // Don't switch
 272                                                 {}
 273                                         else if (j == 1)
 274                                                 // Switch from -Z (south) to +X (east)
 275                                                 vertex.Pos.rotateXZBy(90);
 276                                         else if (j == 2)
 277                                                 // Switch from -Z (south) to -X (west)
 278                                                 vertex.Pos.rotateXZBy(-90);
 279                                         else
 280                                                 // Switch from -Z (south) to +Z (north)
 281                                                 vertex.Pos.rotateXZBy(-180);
 282                                 }
 283                                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 284                         }
 285                 }
 286
 287                 // Draw stars before sun and moon to be behind them
 288                 if (m_star_params.visible)
 289                         draw_stars(driver, wicked_time_of_day);
 290
 291                 // Draw sunrise/sunset horizon glow texture
 292                 // (textures/base/pack/sunrisebg.png)
 293                 if (m_sun_params.sunrise_visible) {
 294                         driver->setMaterial(m_materials[2]);
 295                         float mid1 = 0.25;
 296                         float mid = wicked_time_of_day < 0.5 ? mid1 : (1.0 - mid1);
 297                         float a_ = 1.0f - std::fabs(wicked_time_of_day - mid) * 35.0f;
 298                         float a = easeCurve(MYMAX(0, MYMIN(1, a_)));
 299                         //std::cerr<<"a_="<<a_<<" a="<<a<<std::endl;
 300                         video::SColor c(255, 255, 255, 255);
 301                         float y = -(1.0 - a) * 0.22;
 302                         vertices[0] = video::S3DVertex(-1, -0.05 + y, -1, 0, 0, 1, c, t, t);
 303                         vertices[1] = video::S3DVertex( 1, -0.05 + y, -1, 0, 0, 1, c, o, t);
 304                         vertices[2] = video::S3DVertex( 1,   0.2 + y, -1, 0, 0, 1, c, o, o);
 305                         vertices[3] = video::S3DVertex(-1,   0.2 + y, -1, 0, 0, 1, c, t, o);
 306                         for (video::S3DVertex &vertex : vertices) {
 307                                 if (wicked_time_of_day < 0.5)
 308                                         // Switch from -Z (south) to +X (east)
 309                                         vertex.Pos.rotateXZBy(90);
 310                                 else
 311                                         // Switch from -Z (south) to -X (west)
 312                                         vertex.Pos.rotateXZBy(-90);
 313                         }
 314                         driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 315                 }
 316
 317                 // Draw sun
 318                 if (m_sun_params.visible)
 319                         draw_sun(driver, sunsize, suncolor, suncolor2, wicked_time_of_day);
 320
 321                 // Draw moon
 322                 if (m_moon_params.visible)
 323                         draw_moon(driver, moonsize, mooncolor, mooncolor2, wicked_time_of_day);
 324
 325                 // Draw far cloudy fog thing below all horizons in front of sun, moon
 326                 // and stars.
 327                 if (m_visible) {
 328                         driver->setMaterial(m_materials[1]);
 329
 330                         for (u32 j = 0; j < 4; j++) {
 331                                 video::SColor c = cloudyfogcolor;
 332                                 vertices[0] = video::S3DVertex(-1, -1.0,  -1, 0, 0, 1, c, t, t);
 333                                 vertices[1] = video::S3DVertex( 1, -1.0,  -1, 0, 0, 1, c, o, t);
 334                                 vertices[2] = video::S3DVertex( 1, -0.02, -1, 0, 0, 1, c, o, o);
 335                                 vertices[3] = video::S3DVertex(-1, -0.02, -1, 0, 0, 1, c, t, o);
 336                                 for (video::S3DVertex &vertex : vertices) {
 337                                         if (j == 0)
 338                                                 // Don't switch
 339                                                 {}
 340                                         else if (j == 1)
 341                                                 // Switch from -Z (south) to +X (east)
 342                                                 vertex.Pos.rotateXZBy(90);
 343                                         else if (j == 2)
 344                                                 // Switch from -Z (south) to -X (west)
 345                                                 vertex.Pos.rotateXZBy(-90);
 346                                         else
 347                                                 // Switch from -Z (south) to +Z (north)
 348                                                 vertex.Pos.rotateXZBy(-180);
 349                                 }
 350                                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 351                         }
 352
 353                         // Draw bottom far cloudy fog thing in front of sun, moon and stars
 354                         video::SColor c = cloudyfogcolor;
 355                         vertices[0] = video::S3DVertex(-1, -1.0, -1, 0, 1, 0, c, t, t);
 356                         vertices[1] = video::S3DVertex( 1, -1.0, -1, 0, 1, 0, c, o, t);
 357                         vertices[2] = video::S3DVertex( 1, -1.0, 1, 0, 1, 0, c, o, o);
 358                         vertices[3] = video::S3DVertex(-1, -1.0, 1, 0, 1, 0, c, t, o);
 359                         driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 360                 }
 361         }
 362 }
 363
 364 void Sky::update(float time_of_day, float time_brightness,
 365         float direct_brightness, bool sunlight_seen,
 366         CameraMode cam_mode, float yaw, float pitch)
 367 {
 368         // Stabilize initial brightness and color values by flooding updates
 369         if (m_first_update) {
 370                 /*dstream<<"First update with time_of_day="<<time_of_day
 371                                 <<" time_brightness="<<time_brightness
 372                                 <<" direct_brightness="<<direct_brightness
 373                                 <<" sunlight_seen="<<sunlight_seen<<std::endl;*/
 374                 m_first_update = false;
 375                 for (u32 i = 0; i < 100; i++) {
 376                         update(time_of_day, time_brightness, direct_brightness,
 377                                         sunlight_seen, cam_mode, yaw, pitch);
 378                 }
 379                 return;
 380         }
 381
 382         m_time_of_day = time_of_day;
 383         m_time_brightness = time_brightness;
 384         m_sunlight_seen = sunlight_seen;
 385         m_in_clouds = false;
 386
 387         bool is_dawn = (time_brightness >= 0.20 && time_brightness < 0.35);
 388
 389         /*
 390         Development colours
 391
 392         video::SColorf bgcolor_bright_normal_f(170. / 255, 200. / 255, 230. / 255, 1.0);
 393         video::SColorf bgcolor_bright_dawn_f(0.666, 200. / 255 * 0.7, 230. / 255 * 0.5, 1.0);
 394         video::SColorf bgcolor_bright_dawn_f(0.666, 0.549, 0.220, 1.0);
 395         video::SColorf bgcolor_bright_dawn_f(0.666 * 1.2, 0.549 * 1.0, 0.220 * 1.0, 1.0);
 396         video::SColorf bgcolor_bright_dawn_f(0.666 * 1.2, 0.549 * 1.0, 0.220 * 1.2, 1.0);
 397
 398         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.591, 0.4);
 399         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.65, 0.44);
 400         video::SColorf cloudcolor_bright_dawn_f(1.0, 0.7, 0.5);
 401         */
 402
 403         video::SColorf bgcolor_bright_normal_f = m_sky_params.sky_color.day_horizon;
 404         video::SColorf bgcolor_bright_indoor_f = m_sky_params.sky_color.indoors;
 405         video::SColorf bgcolor_bright_dawn_f = m_sky_params.sky_color.dawn_horizon;
 406         video::SColorf bgcolor_bright_night_f = m_sky_params.sky_color.night_horizon;
 407
 408         video::SColorf skycolor_bright_normal_f = m_sky_params.sky_color.day_sky;
 409         video::SColorf skycolor_bright_dawn_f = m_sky_params.sky_color.dawn_sky;
 410         video::SColorf skycolor_bright_night_f = m_sky_params.sky_color.night_sky;
 411
 412         video::SColorf cloudcolor_bright_normal_f = m_cloudcolor_day_f;
 413         video::SColorf cloudcolor_bright_dawn_f = m_cloudcolor_dawn_f;
 414
 415         float cloud_color_change_fraction = 0.95;
 416         if (sunlight_seen) {
 417                 if (std::fabs(time_brightness - m_brightness) < 0.2f) {
 418                         m_brightness = m_brightness * 0.95 + time_brightness * 0.05;
 419                 } else {
 420                         m_brightness = m_brightness * 0.80 + time_brightness * 0.20;
 421                         cloud_color_change_fraction = 0.0;
 422                 }
 423         } else {
 424                 if (direct_brightness < m_brightness)
 425                         m_brightness = m_brightness * 0.95 + direct_brightness * 0.05;
 426                 else
 427                         m_brightness = m_brightness * 0.98 + direct_brightness * 0.02;
 428         }
 429
 430         m_clouds_visible = true;
 431         float color_change_fraction = 0.98f;
 432         if (sunlight_seen) {
 433                 if (is_dawn) { // Dawn
 434                         m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 435                                 bgcolor_bright_dawn_f, color_change_fraction);
 436                         m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 437                                 skycolor_bright_dawn_f, color_change_fraction);
 438                         m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 439                                 cloudcolor_bright_dawn_f, color_change_fraction);
 440                 } else {
 441                         if (time_brightness < 0.13f) { // Night
 442                                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 443                                         bgcolor_bright_night_f, color_change_fraction);
 444                                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 445                                         skycolor_bright_night_f, color_change_fraction);
 446                         } else { // Day
 447                                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 448                                         bgcolor_bright_normal_f, color_change_fraction);
 449                                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 450                                         skycolor_bright_normal_f, color_change_fraction);
 451                         }
 452
 453                         m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 454                                 cloudcolor_bright_normal_f, color_change_fraction);
 455                 }
 456         } else {
 457                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 458                         bgcolor_bright_indoor_f, color_change_fraction);
 459                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 460                         bgcolor_bright_indoor_f, color_change_fraction);
 461                 m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 462                         cloudcolor_bright_normal_f, color_change_fraction);
 463                 m_clouds_visible = false;
 464         }
 465
 466         video::SColor bgcolor_bright = m_bgcolor_bright_f.toSColor();
 467         m_bgcolor = video::SColor(
 468                 255,
 469                 bgcolor_bright.getRed() * m_brightness,
 470                 bgcolor_bright.getGreen() * m_brightness,
 471                 bgcolor_bright.getBlue() * m_brightness
 472         );
 473
 474         video::SColor skycolor_bright = m_skycolor_bright_f.toSColor();
 475         m_skycolor = video::SColor(
 476                 255,
 477                 skycolor_bright.getRed() * m_brightness,
 478                 skycolor_bright.getGreen() * m_brightness,
 479                 skycolor_bright.getBlue() * m_brightness
 480         );
 481
 482         // Horizon coloring based on sun and moon direction during sunset and sunrise
 483         video::SColor pointcolor = video::SColor(m_bgcolor.getAlpha(), 255, 255, 255);
 484         if (m_directional_colored_fog) {
 485                 if (m_horizon_blend() != 0) {
 486                         // Calculate hemisphere value from yaw, (inverted in third person front view)
 487                         s8 dir_factor = 1;
 488                         if (cam_mode > CAMERA_MODE_THIRD)
 489                                 dir_factor = -1;
 490                         f32 pointcolor_blend = wrapDegrees_0_360(yaw * dir_factor + 90);
 491                         if (pointcolor_blend > 180)
 492                                 pointcolor_blend = 360 - pointcolor_blend;
 493                         pointcolor_blend /= 180;
 494                         // Bound view angle to determine where transition starts and ends
 495                         pointcolor_blend = rangelim(1 - pointcolor_blend * 1.375, 0, 1 / 1.375) *
 496                                 1.375;
 497                         // Combine the colors when looking up or down, otherwise turning looks weird
 498                         pointcolor_blend += (0.5 - pointcolor_blend) *
 499                                 (1 - MYMIN((90 - std::fabs(pitch)) / 90 * 1.5, 1));
 500                         // Invert direction to match where the sun and moon are rising
 501                         if (m_time_of_day > 0.5)
 502                                 pointcolor_blend = 1 - pointcolor_blend;
 503                         // Horizon colors of sun and moon
 504                         f32 pointcolor_light = rangelim(m_time_brightness * 3, 0.2, 1);
 505
 506                         video::SColorf pointcolor_sun_f(1, 1, 1, 1);
 507                         // Use tonemap only if default sun/moon tinting is used
 508                         // which keeps previous behaviour.
 509                         if (m_sun_tonemap && m_default_tint) {
 510                                 pointcolor_sun_f.r = pointcolor_light *
 511                                         (float)m_materials[3].EmissiveColor.getRed() / 255;
 512                                 pointcolor_sun_f.b = pointcolor_light *
 513                                         (float)m_materials[3].EmissiveColor.getBlue() / 255;
 514                                 pointcolor_sun_f.g = pointcolor_light *
 515                                         (float)m_materials[3].EmissiveColor.getGreen() / 255;
 516                         } else if (!m_default_tint) {
 517                                 pointcolor_sun_f = m_sky_params.fog_sun_tint;
 518                         } else {
 519                                 pointcolor_sun_f.r = pointcolor_light * 1;
 520                                 pointcolor_sun_f.b = pointcolor_light *
 521                                         (0.25 + (rangelim(m_time_brightness, 0.25, 0.75) - 0.25) * 2 * 0.75);
 522                                 pointcolor_sun_f.g = pointcolor_light * (pointcolor_sun_f.b * 0.375 +
 523                                         (rangelim(m_time_brightness, 0.05, 0.15) - 0.05) * 10 * 0.625);
 524                         }
 525
 526                         video::SColorf pointcolor_moon_f;
 527                         if (m_default_tint) {
 528                                 pointcolor_moon_f = video::SColorf(
 529                                         0.5 * pointcolor_light,
 530                                         0.6 * pointcolor_light,
 531                                         0.8 * pointcolor_light,
 532                                         1
 533                                 );
 534                         } else {
 535                                 pointcolor_moon_f = video::SColorf(
 536                                         (m_sky_params.fog_moon_tint.getRed() / 255) * pointcolor_light,
 537                                         (m_sky_params.fog_moon_tint.getGreen() / 255) * pointcolor_light,
 538                                         (m_sky_params.fog_moon_tint.getBlue() / 255) * pointcolor_light,
 539                                         1
 540                                 );
 541                         }
 542                         if (m_moon_tonemap && m_default_tint) {
 543                                 pointcolor_moon_f.r = pointcolor_light *
 544                                         (float)m_materials[4].EmissiveColor.getRed() / 255;
 545                                 pointcolor_moon_f.b = pointcolor_light *
 546                                         (float)m_materials[4].EmissiveColor.getBlue() / 255;
 547                                 pointcolor_moon_f.g = pointcolor_light *
 548                                         (float)m_materials[4].EmissiveColor.getGreen() / 255;
 549                         }
 550
 551                         video::SColor pointcolor_sun = pointcolor_sun_f.toSColor();
 552                         video::SColor pointcolor_moon = pointcolor_moon_f.toSColor();
 553                         // Calculate the blend color
 554                         pointcolor = m_mix_scolor(pointcolor_moon, pointcolor_sun, pointcolor_blend);
 555                 }
 556                 m_bgcolor = m_mix_scolor(m_bgcolor, pointcolor, m_horizon_blend() * 0.5);
 557                 m_skycolor = m_mix_scolor(m_skycolor, pointcolor, m_horizon_blend() * 0.25);
 558         }
 559
 560         float cloud_direct_brightness = 0.0f;
 561         if (sunlight_seen) {
 562                 if (!m_directional_colored_fog) {
 563                         cloud_direct_brightness = time_brightness;
 564                         // Boost cloud brightness relative to sky, at dawn, dusk and at night
 565                         if (time_brightness < 0.7f)
 566                                 cloud_direct_brightness *= 1.3f;
 567                 } else {
 568                         cloud_direct_brightness = std::fmin(m_horizon_blend() * 0.15f +
 569                                 m_time_brightness, 1.0f);
 570                         // Set the same minimum cloud brightness at night
 571                         if (time_brightness < 0.5f)
 572                                 cloud_direct_brightness = std::fmax(cloud_direct_brightness,
 573                                         time_brightness * 1.3f);
 574                 }
 575         } else {
 576                 cloud_direct_brightness = direct_brightness;
 577         }
 578
 579         m_cloud_brightness = m_cloud_brightness * cloud_color_change_fraction +
 580                 cloud_direct_brightness * (1.0 - cloud_color_change_fraction);
 581         m_cloudcolor_f = video::SColorf(
 582                 m_cloudcolor_bright_f.r * m_cloud_brightness,
 583                 m_cloudcolor_bright_f.g * m_cloud_brightness,
 584                 m_cloudcolor_bright_f.b * m_cloud_brightness,
 585                 1.0
 586         );
 587         if (m_directional_colored_fog) {
 588                 m_cloudcolor_f = m_mix_scolorf(m_cloudcolor_f,
 589                         video::SColorf(pointcolor), m_horizon_blend() * 0.25);
 590         }
 591 }
 592
 593 void Sky::draw_sun(video::IVideoDriver *driver, float sunsize, const video::SColor &suncolor,
 594         const video::SColor &suncolor2, float wicked_time_of_day)
 595         /* Draw sun in the sky.
 596          * driver: Video driver object used to draw
 597          * sunsize: the default size of the sun
 598          * suncolor: main sun color
 599          * suncolor2: second sun color
 600          * wicked_time_of_day: current time of day, to know where should be the sun in the sky
 601          */
 602 {
 603         static const u16 indices[] = {0, 1, 2, 0, 2, 3};
 604         std::array<video::S3DVertex, 4> vertices;
 605         if (!m_sun_texture) {
 606                 driver->setMaterial(m_materials[1]);
 607                 const float sunsizes[4] = {
 608                         (sunsize * 1.7f) * m_sun_params.scale,
 609                         (sunsize * 1.2f) * m_sun_params.scale,
 610                         (sunsize) * m_sun_params.scale,
 611                         (sunsize * 0.7f) * m_sun_params.scale
 612                 };
 613                 video::SColor c1 = suncolor;
 614                 video::SColor c2 = suncolor;
 615                 c1.setAlpha(0.05 * 255);
 616                 c2.setAlpha(0.15 * 255);
 617                 const video::SColor colors[4] = {c1, c2, suncolor, suncolor2};
 618                 for (int i = 0; i < 4; i++) {
 619                         draw_sky_body(vertices, -sunsizes[i], sunsizes[i], colors[i]);
 620                         place_sky_body(vertices, 90, wicked_time_of_day * 360 - 90);
 621                         driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 622                 }
 623         } else {
 624                 driver->setMaterial(m_materials[3]);
 625                 float d = (sunsize * 1.7) * m_sun_params.scale;
 626                 video::SColor c;
 627                 if (m_sun_tonemap)
 628                         c = video::SColor(0, 0, 0, 0);
 629                 else
 630                         c = video::SColor(255, 255, 255, 255);
 631                 draw_sky_body(vertices, -d, d, c);
 632                 place_sky_body(vertices, 90, wicked_time_of_day * 360 - 90);
 633                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 634         }
 635 }
 636
 637
 638 void Sky::draw_moon(video::IVideoDriver *driver, float moonsize, const video::SColor &mooncolor,
 639         const video::SColor &mooncolor2, float wicked_time_of_day)
 640 /*
 641         * Draw moon in the sky.
 642         * driver: Video driver object used to draw
 643         * moonsize: the default size of the moon
 644         * mooncolor: main moon color
 645         * mooncolor2: second moon color
 646         * wicked_time_of_day: current time of day, to know where should be the moon in
 647         * the sky
 648         */
 649 {
 650         static const u16 indices[] = {0, 1, 2, 0, 2, 3};
 651         std::array<video::S3DVertex, 4> vertices;
 652         if (!m_moon_texture) {
 653                 driver->setMaterial(m_materials[1]);
 654                 const float moonsizes_1[4] = {
 655                         (-moonsize * 1.9f) * m_moon_params.scale,
 656                         (-moonsize * 1.3f) * m_moon_params.scale,
 657                         (-moonsize) * m_moon_params.scale,
 658                         (-moonsize) * m_moon_params.scale
 659                 };
 660                 const float moonsizes_2[4] = {
 661                         (moonsize * 1.9f) * m_moon_params.scale,
 662                         (moonsize * 1.3f) * m_moon_params.scale,
 663                         (moonsize) *m_moon_params.scale,
 664                         (moonsize * 0.6f) * m_moon_params.scale
 665                 };
 666                 video::SColor c1 = mooncolor;
 667                 video::SColor c2 = mooncolor;
 668                 c1.setAlpha(0.05 * 255);
 669                 c2.setAlpha(0.15 * 255);
 670                 const video::SColor colors[4] = {c1, c2, mooncolor, mooncolor2};
 671                 for (int i = 0; i < 4; i++) {
 672                         draw_sky_body(vertices, moonsizes_1[i], moonsizes_2[i], colors[i]);
 673                         place_sky_body(vertices, -90, wicked_time_of_day * 360 - 90);
 674                         driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 675                 }
 676         } else {
 677                 driver->setMaterial(m_materials[4]);
 678                 float d = (moonsize * 1.9) * m_moon_params.scale;
 679                 video::SColor c;
 680                 if (m_moon_tonemap)
 681                         c = video::SColor(0, 0, 0, 0);
 682                 else
 683                         c = video::SColor(255, 255, 255, 255);
 684                 draw_sky_body(vertices, -d, d, c);
 685                 place_sky_body(vertices, -90, wicked_time_of_day * 360 - 90);
 686                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 687         }
 688 }
 689
 690 void Sky::draw_stars(video::IVideoDriver * driver, float wicked_time_of_day)
 691 {
 692         // Tune values so that stars first appear just after the sun
 693         // disappears over the horizon, and disappear just before the sun
 694         // appears over the horizon.
 695         // Also tune so that stars are at full brightness from time 20000
 696         // to time 4000.
 697
 698         float tod = wicked_time_of_day < 0.5f ? wicked_time_of_day : (1.0f - wicked_time_of_day);
 699         float starbrightness = (0.25f - fabsf(tod)) * 20.0f;
 700         m_star_color = m_star_params.starcolor;
 701         m_star_color.a *= clamp(starbrightness, 0.0f, 1.0f);
 702         if (m_star_color.a <= 0.0f) // Stars are only drawn when not fully transparent
 703                 return;
 704         m_materials[0].DiffuseColor = m_materials[0].EmissiveColor = m_star_color.toSColor();
 705         auto sky_rotation = core::matrix4().setRotationAxisRadians(2.0f * M_PI * (wicked_time_of_day - 0.25f), v3f(0.0f, 0.0f, 1.0f));
 706         auto world_matrix = driver->getTransform(video::ETS_WORLD);
 707         driver->setTransform(video::ETS_WORLD, world_matrix * sky_rotation);
 708         driver->setMaterial(m_materials[0]);
 709         driver->drawMeshBuffer(m_stars.get());
 710         driver->setTransform(video::ETS_WORLD, world_matrix);
 711 }
 712
 713 void Sky::draw_sky_body(std::array<video::S3DVertex, 4> &vertices, float pos_1, float pos_2, const video::SColor &c)
 714 {
 715         /*
 716         * Create an array of vertices with the dimensions specified.
 717         * pos_1, pos_2: position of the body's vertices
 718         * c: color of the body
 719         */
 720
 721         const f32 t = 1.0f;
 722         const f32 o = 0.0f;
 723         vertices[0] = video::S3DVertex(pos_1, pos_1, -1, 0, 0, 1, c, t, t);
 724         vertices[1] = video::S3DVertex(pos_2, pos_1, -1, 0, 0, 1, c, o, t);
 725         vertices[2] = video::S3DVertex(pos_2, pos_2, -1, 0, 0, 1, c, o, o);
 726         vertices[3] = video::S3DVertex(pos_1, pos_2, -1, 0, 0, 1, c, t, o);
 727 }
 728
 729
 730 void Sky::place_sky_body(
 731         std::array<video::S3DVertex, 4> &vertices, float horizon_position, float day_position)
 732         /*
 733         * Place body in the sky.
 734         * vertices: The body as a rectangle of 4 vertices
 735         * horizon_position: turn the body around the Y axis
 736         * day_position: turn the body around the Z axis, to place it depending of the time of the day
 737         */
 738 {
 739         for (video::S3DVertex &vertex : vertices) {
 740                 // Body is directed to -Z (south) by default
 741                 vertex.Pos.rotateXZBy(horizon_position);
 742                 vertex.Pos.rotateXYBy(day_position);
 743         }
 744 }
 745
 746 void Sky::setSunTexture(std::string sun_texture,
 747                 std::string sun_tonemap, ITextureSource *tsrc)
 748 {
 749         // Ignore matching textures (with modifiers) entirely,
 750         // but lets at least update the tonemap before hand.
 751         m_sun_params.tonemap = sun_tonemap;
 752         m_sun_tonemap = tsrc->isKnownSourceImage(m_sun_params.tonemap) ?
 753                 tsrc->getTexture(m_sun_params.tonemap) : NULL;
 754         m_materials[3].Lighting = !!m_sun_tonemap;
 755
 756         if (m_sun_params.texture == sun_texture)
 757                 return;
 758         m_sun_params.texture = sun_texture;
 759
 760         if (sun_texture != "") {
 761                 // We want to ensure the texture exists first.
 762                 m_sun_texture = tsrc->getTextureForMesh(m_sun_params.texture);
 763
 764                 if (m_sun_texture) {
 765                         m_materials[3] = baseMaterial();
 766                         m_materials[3].setTexture(0, m_sun_texture);
 767                         m_materials[3].MaterialType = video::
 768                                 EMT_TRANSPARENT_ALPHA_CHANNEL;
 769                         // Disables texture filtering
 770                         m_materials[3].setFlag(
 771                                 video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
 772                         m_materials[3].setFlag(
 773                                 video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
 774                         m_materials[3].setFlag(
 775                                 video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
 776                 }
 777         } else {
 778                 m_sun_texture = nullptr;
 779         }
 780 }
 781
 782 void Sky::setSunriseTexture(std::string sunglow_texture,
 783                 ITextureSource* tsrc)
 784 {
 785         // Ignore matching textures (with modifiers) entirely.
 786         if (m_sun_params.sunrise == sunglow_texture)
 787                 return;
 788         m_sun_params.sunrise = sunglow_texture;
 789         m_materials[2].setTexture(0, tsrc->getTextureForMesh(
 790                 sunglow_texture.empty() ? "sunrisebg.png" : sunglow_texture)
 791         );
 792 }
 793
 794 void Sky::setMoonTexture(std::string moon_texture,
 795                 std::string moon_tonemap, ITextureSource *tsrc)
 796 {
 797         // Ignore matching textures (with modifiers) entirely,
 798         // but lets at least update the tonemap before hand.
 799         m_moon_params.tonemap = moon_tonemap;
 800         m_moon_tonemap = tsrc->isKnownSourceImage(m_moon_params.tonemap) ?
 801                 tsrc->getTexture(m_moon_params.tonemap) : NULL;
 802         m_materials[4].Lighting = !!m_moon_tonemap;
 803
 804         if (m_moon_params.texture == moon_texture)
 805                 return;
 806         m_moon_params.texture = moon_texture;
 807
 808         if (moon_texture != "") {
 809                 // We want to ensure the texture exists first.
 810                 m_moon_texture = tsrc->getTextureForMesh(m_moon_params.texture);
 811
 812                 if (m_moon_texture) {
 813                         m_materials[4] = baseMaterial();
 814                         m_materials[4].setTexture(0, m_moon_texture);
 815                         m_materials[4].MaterialType = video::
 816                                 EMT_TRANSPARENT_ALPHA_CHANNEL;
 817                         // Disables texture filtering
 818                         m_materials[4].setFlag(
 819                                 video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
 820                         m_materials[4].setFlag(
 821                                 video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
 822                         m_materials[4].setFlag(
 823                                 video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
 824                 }
 825         } else {
 826                 m_moon_texture = nullptr;
 827         }
 828 }
 829
 830 void Sky::setStarCount(u16 star_count, bool force_update)
 831 {
 832         // Allow force updating star count at game init.
 833         if (m_star_params.count != star_count || force_update) {
 834                 m_star_params.count = star_count;
 835                 m_seed = (u64)myrand() << 32 | myrand();
 836                 updateStars();
 837         }
 838 }
 839
 840 void Sky::updateStars()
 841 {
 842         m_stars.reset(new scene::SMeshBuffer());
 843         // Stupid IrrLicht doesn’t allow non-indexed rendering, and indexed quad
 844         // rendering is slow due to lack of hardware support. So as indices are
 845         // 16-bit and there are 4 vertices per star... the limit is 2^16/4 = 0x4000.
 846         // That should be well enough actually.
 847         if (m_star_params.count > 0x4000) {
 848                 warningstream << "Requested " << m_star_params.count << " stars but " << 0x4000 << " is the max\n";
 849                 m_star_params.count = 0x4000;
 850         }
 851         m_stars->Vertices.reallocate(4 * m_star_params.count);
 852         m_stars->Indices.reallocate(6 * m_star_params.count);
 853
 854         video::SColor fallback_color = m_star_params.starcolor; // used on GLES 2 “without shaders”
 855         PcgRandom rgen(m_seed);
 856         float d = (0.006 / 2) * m_star_params.scale;
 857         for (u16 i = 0; i < m_star_params.count; i++) {
 858                 v3f r = v3f(
 859                         rgen.range(-10000, 10000),
 860                         rgen.range(-10000, 10000),
 861                         rgen.range(-10000, 10000)
 862                 );
 863                 core::CMatrix4<f32> a;
 864                 a.buildRotateFromTo(v3f(0, 1, 0), r);
 865                 v3f p = v3f(-d, 1, -d);
 866                 v3f p1 = v3f(d, 1, -d);
 867                 v3f p2 = v3f(d, 1, d);
 868                 v3f p3 = v3f(-d, 1, d);
 869                 a.rotateVect(p);
 870                 a.rotateVect(p1);
 871                 a.rotateVect(p2);
 872                 a.rotateVect(p3);
 873                 m_stars->Vertices.push_back(video::S3DVertex(p, {}, fallback_color, {}));
 874                 m_stars->Vertices.push_back(video::S3DVertex(p1, {}, fallback_color, {}));
 875                 m_stars->Vertices.push_back(video::S3DVertex(p2, {}, fallback_color, {}));
 876                 m_stars->Vertices.push_back(video::S3DVertex(p3, {}, fallback_color, {}));
 877         }
 878         for (u16 i = 0; i < m_star_params.count; i++) {
 879                 m_stars->Indices.push_back(i * 4 + 0);
 880                 m_stars->Indices.push_back(i * 4 + 1);
 881                 m_stars->Indices.push_back(i * 4 + 2);
 882                 m_stars->Indices.push_back(i * 4 + 2);
 883                 m_stars->Indices.push_back(i * 4 + 3);
 884                 m_stars->Indices.push_back(i * 4 + 0);
 885         }
 886         m_stars->setHardwareMappingHint(scene::EHM_STATIC);
 887 }
 888
 889 void Sky::setSkyColors(const SkyColor &sky_color)
 890 {
 891         m_sky_params.sky_color = sky_color;
 892 }
 893
 894 void Sky::setHorizonTint(video::SColor sun_tint, video::SColor moon_tint,
 895                 std::string use_sun_tint)
 896 {
 897         // Change sun and moon tinting:
 898         m_sky_params.fog_sun_tint = sun_tint;
 899         m_sky_params.fog_moon_tint = moon_tint;
 900         // Faster than comparing strings every rendering frame
 901         if (use_sun_tint == "default")
 902                 m_default_tint = true;
 903         else if (use_sun_tint == "custom")
 904                 m_default_tint = false;
 905         else
 906                 m_default_tint = true;
 907 }
 908
 909 void Sky::addTextureToSkybox(std::string texture, int material_id,
 910                 ITextureSource *tsrc)
 911 {
 912         // Sanity check for more than six textures.
 913         if (material_id + 5 >= SKY_MATERIAL_COUNT)
 914                 return;
 915         // Keep a list of texture names handy.
 916         m_sky_params.textures.emplace_back(texture);
 917         video::ITexture *result = tsrc->getTextureForMesh(texture);
 918         m_materials[material_id+5] = baseMaterial();
 919         m_materials[material_id+5].setTexture(0, result);
 920         m_materials[material_id+5].MaterialType = video::EMT_SOLID;
 921 }
 922
 923 // To be called once at game init to setup default values.
 924 void Sky::setSkyDefaults()
 925 {
 926         SkyboxDefaults sky_defaults;
 927         m_sky_params.sky_color = sky_defaults.getSkyColorDefaults();
 928         m_sun_params = sky_defaults.getSunDefaults();
 929         m_moon_params = sky_defaults.getMoonDefaults();
 930         m_star_params = sky_defaults.getStarDefaults();
 931 }