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