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 <cmath>
  22 #include "sky.h"
  23 #include <ITexture.h>
  24 #include <IVideoDriver.h>
  25 #include <ISceneManager.h>
  26 #include <ICameraSceneNode.h>
  27 #include <S3DVertex.h>
  28 #include "client/tile.h"
  29 #include "noise.h" // easeCurve
  30 #include "profiler.h"
  31 #include "util/numeric.h"
  32 #include "client/renderingengine.h"
  33 #include "settings.h"
  34 #include "camera.h" // CameraModes
  35
  36 using namespace irr::core;
  37
  38 static video::SMaterial baseMaterial()
  39 {
  40         video::SMaterial mat;
  41         mat.Lighting = false;
  42 #if IRRLICHT_VERSION_MAJOR == 1 && IRRLICHT_VERSION_MINOR > 8
  43         mat.ZBuffer = video::ECFN_DISABLED;
  44         mat.ZWriteEnable = video::EZW_OFF;
  45 #else
  46         mat.ZWriteEnable = false;
  47         mat.ZBuffer = video::ECFN_NEVER;
  48 #endif
  49         mat.AntiAliasing = 0;
  50         mat.TextureLayer[0].TextureWrapU = video::ETC_CLAMP_TO_EDGE;
  51         mat.TextureLayer[0].TextureWrapV = video::ETC_CLAMP_TO_EDGE;
  52         mat.BackfaceCulling = false;
  53         return mat;
  54 }
  55
  56 static inline void disableTextureFiltering(video::SMaterial &mat)
  57 {
  58         mat.setFlag(video::E_MATERIAL_FLAG::EMF_BILINEAR_FILTER, false);
  59         mat.setFlag(video::E_MATERIAL_FLAG::EMF_TRILINEAR_FILTER, false);
  60         mat.setFlag(video::E_MATERIAL_FLAG::EMF_ANISOTROPIC_FILTER, false);
  61 }
  62
  63 Sky::Sky(s32 id, RenderingEngine *rendering_engine, ITextureSource *tsrc, IShaderSource *ssrc) :
  64                 scene::ISceneNode(rendering_engine->get_scene_manager()->getRootSceneNode(),
  65                         rendering_engine->get_scene_manager(), id)
  66 {
  67         m_seed = (u64)myrand() << 32 | myrand();
  68
  69         setAutomaticCulling(scene::EAC_OFF);
  70         m_box.MaxEdge.set(0, 0, 0);
  71         m_box.MinEdge.set(0, 0, 0);
  72
  73         m_enable_shaders = g_settings->getBool("enable_shaders");
  74
  75         m_sky_params = SkyboxDefaults::getSkyDefaults();
  76         m_sun_params = SkyboxDefaults::getSunDefaults();
  77         m_moon_params = SkyboxDefaults::getMoonDefaults();
  78         m_star_params = SkyboxDefaults::getStarDefaults();
  79
  80         // Create materials
  81
  82         m_materials[0] = baseMaterial();
  83         m_materials[0].MaterialType = ssrc->getShaderInfo(ssrc->getShader("stars_shader", TILE_MATERIAL_ALPHA)).material;
  84         m_materials[0].Lighting = true;
  85         m_materials[0].ColorMaterial = video::ECM_NONE;
  86
  87         m_materials[1] = baseMaterial();
  88         m_materials[1].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  89
  90         m_materials[2] = baseMaterial();
  91         m_materials[2].setTexture(0, tsrc->getTextureForMesh("sunrisebg.png"));
  92         m_materials[2].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  93
  94         setSunTexture(m_sun_params.texture, m_sun_params.tonemap, tsrc);
  95
  96         setMoonTexture(m_moon_params.texture, m_moon_params.tonemap, tsrc);
  97
  98         for (int i = 5; i < 11; i++) {
  99                 m_materials[i] = baseMaterial();
 100                 m_materials[i].Lighting = true;
 101                 m_materials[i].MaterialType = video::EMT_SOLID;
 102         }
 103
 104         m_directional_colored_fog = g_settings->getBool("directional_colored_fog");
 105
 106         if (g_settings->getBool("enable_dynamic_shadows")) {
 107                 float val = g_settings->getFloat("shadow_sky_body_orbit_tilt");
 108                 m_sky_body_orbit_tilt = rangelim(val, 0.0f, 60.0f);
 109         }
 110
 111         setStarCount(1000);
 112 }
 113
 114 void Sky::OnRegisterSceneNode()
 115 {
 116         if (IsVisible)
 117                 SceneManager->registerNodeForRendering(this, scene::ESNRP_SKY_BOX);
 118
 119         scene::ISceneNode::OnRegisterSceneNode();
 120 }
 121
 122 void Sky::render()
 123 {
 124         video::IVideoDriver *driver = SceneManager->getVideoDriver();
 125         scene::ICameraSceneNode *camera = SceneManager->getActiveCamera();
 126
 127         if (!camera || !driver)
 128                 return;
 129
 130         ScopeProfiler sp(g_profiler, "Sky::render()", SPT_AVG);
 131
 132         // Draw perspective skybox
 133
 134         core::matrix4 translate(AbsoluteTransformation);
 135         translate.setTranslation(camera->getAbsolutePosition());
 136
 137         // Draw the sky box between the near and far clip plane
 138         const f32 viewDistance = (camera->getNearValue() + camera->getFarValue()) * 0.5f;
 139         core::matrix4 scale;
 140         scale.setScale(core::vector3df(viewDistance, viewDistance, viewDistance));
 141
 142         driver->setTransform(video::ETS_WORLD, translate * scale);
 143
 144         if (m_sunlight_seen) {
 145                 float sunsize = 0.07;
 146                 video::SColorf suncolor_f(1, 1, 0, 1);
 147                 //suncolor_f.r = 1;
 148                 //suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.7 + m_time_brightness * 0.5));
 149                 //suncolor_f.b = MYMAX(0.0, m_brightness * 0.95);
 150                 video::SColorf suncolor2_f(1, 1, 1, 1);
 151                 // The values below were probably meant to be suncolor2_f instead of a
 152                 // reassignment of suncolor_f. However, the resulting colour was chosen
 153                 // and is our long-running classic colour. So preserve, but comment-out
 154                 // the unnecessary first assignments above.
 155                 suncolor_f.r = 1;
 156                 suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.85 + m_time_brightness * 0.5));
 157                 suncolor_f.b = MYMAX(0.0, m_brightness);
 158
 159                 float moonsize = 0.04;
 160                 video::SColorf mooncolor_f(0.50, 0.57, 0.65, 1);
 161                 video::SColorf mooncolor2_f(0.85, 0.875, 0.9, 1);
 162
 163                 float wicked_time_of_day = getWickedTimeOfDay(m_time_of_day);
 164
 165                 video::SColor suncolor = suncolor_f.toSColor();
 166                 video::SColor suncolor2 = suncolor2_f.toSColor();
 167                 video::SColor mooncolor = mooncolor_f.toSColor();
 168                 video::SColor mooncolor2 = mooncolor2_f.toSColor();
 169
 170                 // Calculate offset normalized to the X dimension of a 512x1 px tonemap
 171                 float offset = (1.0 - fabs(sin((m_time_of_day - 0.5) * irr::core::PI))) * 511;
 172
 173                 if (m_sun_tonemap) {
 174                         u8 * texels = (u8 *)m_sun_tonemap->lock();
 175                         video::SColor* texel = (video::SColor *)(texels + (u32)offset * 4);
 176                         video::SColor texel_color (255, texel->getRed(),
 177                                 texel->getGreen(), texel->getBlue());
 178                         m_sun_tonemap->unlock();
 179                         m_materials[3].EmissiveColor = texel_color;
 180                 }
 181
 182                 if (m_moon_tonemap) {
 183                         u8 * texels = (u8 *)m_moon_tonemap->lock();
 184                         video::SColor* texel = (video::SColor *)(texels + (u32)offset * 4);
 185                         video::SColor texel_color (255, texel->getRed(),
 186                                 texel->getGreen(), texel->getBlue());
 187                         m_moon_tonemap->unlock();
 188                         m_materials[4].EmissiveColor = texel_color;
 189                 }
 190
 191                 const f32 t = 1.0f;
 192                 const f32 o = 0.0f;
 193                 static const u16 indices[6] = {0, 1, 2, 0, 2, 3};
 194                 video::S3DVertex vertices[4];
 195
 196                 driver->setMaterial(m_materials[1]);
 197
 198                 video::SColor cloudyfogcolor = m_bgcolor;
 199
 200                 // Abort rendering if we're in the clouds.
 201                 // Stops rendering a pure white hole in the bottom of the skybox.
 202                 if (m_in_clouds)
 203                         return;
 204
 205                 // Draw the six sided skybox,
 206                 if (m_sky_params.textures.size() == 6) {
 207                         for (u32 j = 5; j < 11; j++) {
 208                                 video::SColor c(255, 255, 255, 255);
 209                                 driver->setMaterial(m_materials[j]);
 210                                 // Use 1.05 rather than 1.0 to avoid colliding with the
 211                                 // sun, moon and stars, as this is a background skybox.
 212                                 vertices[0] = video::S3DVertex(-1.05, -1.05, -1.05, 0, 0, 1, c, t, t);
 213                                 vertices[1] = video::S3DVertex( 1.05, -1.05, -1.05, 0, 0, 1, c, o, t);
 214                                 vertices[2] = video::S3DVertex( 1.05,  1.05, -1.05, 0, 0, 1, c, o, o);
 215                                 vertices[3] = video::S3DVertex(-1.05,  1.05, -1.05, 0, 0, 1, c, t, o);
 216                                 for (video::S3DVertex &vertex : vertices) {
 217                                         if (j == 5) { // Top texture
 218                                                 vertex.Pos.rotateYZBy(90);
 219                                                 vertex.Pos.rotateXZBy(90);
 220                                         } else if (j == 6) { // Bottom texture
 221                                                 vertex.Pos.rotateYZBy(-90);
 222                                                 vertex.Pos.rotateXZBy(90);
 223                                         } else if (j == 7) { // Left texture
 224                                                 vertex.Pos.rotateXZBy(90);
 225                                         } else if (j == 8) { // Right texture
 226                                                 vertex.Pos.rotateXZBy(-90);
 227                                         } else if (j == 9) { // Front texture, do nothing
 228                                                 // Irrlicht doesn't like it when vertexes are left
 229                                                 // alone and not rotated for some reason.
 230                                                 vertex.Pos.rotateXZBy(0);
 231                                         } else {// Back texture
 232                                                 vertex.Pos.rotateXZBy(180);
 233                                         }
 234                                 }
 235                                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 236                         }
 237                 }
 238
 239                 // Draw far cloudy fog thing blended with skycolor
 240                 if (m_visible) {
 241                         driver->setMaterial(m_materials[1]);
 242                         for (u32 j = 0; j < 4; j++) {
 243                                 vertices[0] = video::S3DVertex(-1, -0.02, -1, 0, 0, 1, m_bgcolor, t, t);
 244                                 vertices[1] = video::S3DVertex( 1, -0.02, -1, 0, 0, 1, m_bgcolor, o, t);
 245                                 vertices[2] = video::S3DVertex( 1, 0.45, -1, 0, 0, 1, m_skycolor, o, o);
 246                                 vertices[3] = video::S3DVertex(-1, 0.45, -1, 0, 0, 1, m_skycolor, t, o);
 247                                 for (video::S3DVertex &vertex : vertices) {
 248                                         if (j == 0)
 249                                                 // Don't switch
 250                                                 {}
 251                                         else if (j == 1)
 252                                                 // Switch from -Z (south) to +X (east)
 253                                                 vertex.Pos.rotateXZBy(90);
 254                                         else if (j == 2)
 255                                                 // Switch from -Z (south) to -X (west)
 256                                                 vertex.Pos.rotateXZBy(-90);
 257                                         else
 258                                                 // Switch from -Z (south) to +Z (north)
 259                                                 vertex.Pos.rotateXZBy(-180);
 260                                 }
 261                                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 262                         }
 263                 }
 264
 265                 // Draw stars before sun and moon to be behind them
 266                 if (m_star_params.visible)
 267                         draw_stars(driver, wicked_time_of_day);
 268
 269                 // Draw sunrise/sunset horizon glow texture
 270                 // (textures/base/pack/sunrisebg.png)
 271                 if (m_sun_params.sunrise_visible) {
 272                         driver->setMaterial(m_materials[2]);
 273                         float mid1 = 0.25;
 274                         float mid = wicked_time_of_day < 0.5 ? mid1 : (1.0 - mid1);
 275                         float a_ = 1.0f - std::fabs(wicked_time_of_day - mid) * 35.0f;
 276                         float a = easeCurve(MYMAX(0, MYMIN(1, a_)));
 277                         //std::cerr<<"a_="<<a_<<" a="<<a<<std::endl;
 278                         video::SColor c(255, 255, 255, 255);
 279                         float y = -(1.0 - a) * 0.22;
 280                         vertices[0] = video::S3DVertex(-1, -0.05 + y, -1, 0, 0, 1, c, t, t);
 281                         vertices[1] = video::S3DVertex( 1, -0.05 + y, -1, 0, 0, 1, c, o, t);
 282                         vertices[2] = video::S3DVertex( 1,   0.2 + y, -1, 0, 0, 1, c, o, o);
 283                         vertices[3] = video::S3DVertex(-1,   0.2 + y, -1, 0, 0, 1, c, t, o);
 284                         for (video::S3DVertex &vertex : vertices) {
 285                                 if (wicked_time_of_day < 0.5)
 286                                         // Switch from -Z (south) to +X (east)
 287                                         vertex.Pos.rotateXZBy(90);
 288                                 else
 289                                         // Switch from -Z (south) to -X (west)
 290                                         vertex.Pos.rotateXZBy(-90);
 291                         }
 292                         driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 293                 }
 294
 295                 // Draw sun
 296                 if (m_sun_params.visible)
 297                         draw_sun(driver, sunsize, suncolor, suncolor2, wicked_time_of_day);
 298
 299                 // Draw moon
 300                 if (m_moon_params.visible)
 301                         draw_moon(driver, moonsize, mooncolor, mooncolor2, wicked_time_of_day);
 302
 303                 // Draw far cloudy fog thing below all horizons in front of sun, moon
 304                 // and stars.
 305                 if (m_visible) {
 306                         driver->setMaterial(m_materials[1]);
 307
 308                         for (u32 j = 0; j < 4; j++) {
 309                                 video::SColor c = cloudyfogcolor;
 310                                 vertices[0] = video::S3DVertex(-1, -1.0,  -1, 0, 0, 1, c, t, t);
 311                                 vertices[1] = video::S3DVertex( 1, -1.0,  -1, 0, 0, 1, c, o, t);
 312                                 vertices[2] = video::S3DVertex( 1, -0.02, -1, 0, 0, 1, c, o, o);
 313                                 vertices[3] = video::S3DVertex(-1, -0.02, -1, 0, 0, 1, c, t, o);
 314                                 for (video::S3DVertex &vertex : vertices) {
 315                                         if (j == 0)
 316                                                 // Don't switch
 317                                                 {}
 318                                         else if (j == 1)
 319                                                 // Switch from -Z (south) to +X (east)
 320                                                 vertex.Pos.rotateXZBy(90);
 321                                         else if (j == 2)
 322                                                 // Switch from -Z (south) to -X (west)
 323                                                 vertex.Pos.rotateXZBy(-90);
 324                                         else
 325                                                 // Switch from -Z (south) to +Z (north)
 326                                                 vertex.Pos.rotateXZBy(-180);
 327                                 }
 328                                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 329                         }
 330
 331                         // Draw bottom far cloudy fog thing in front of sun, moon and stars
 332                         video::SColor c = cloudyfogcolor;
 333                         vertices[0] = video::S3DVertex(-1, -1.0, -1, 0, 1, 0, c, t, t);
 334                         vertices[1] = video::S3DVertex( 1, -1.0, -1, 0, 1, 0, c, o, t);
 335                         vertices[2] = video::S3DVertex( 1, -1.0, 1, 0, 1, 0, c, o, o);
 336                         vertices[3] = video::S3DVertex(-1, -1.0, 1, 0, 1, 0, c, t, o);
 337                         driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 338                 }
 339         }
 340 }
 341
 342 void Sky::update(float time_of_day, float time_brightness,
 343         float direct_brightness, bool sunlight_seen,
 344         CameraMode cam_mode, float yaw, float pitch)
 345 {
 346         // Stabilize initial brightness and color values by flooding updates
 347         if (m_first_update) {
 348                 /*dstream<<"First update with time_of_day="<<time_of_day
 349                                 <<" time_brightness="<<time_brightness
 350                                 <<" direct_brightness="<<direct_brightness
 351                                 <<" sunlight_seen="<<sunlight_seen<<std::endl;*/
 352                 m_first_update = false;
 353                 for (u32 i = 0; i < 100; i++) {
 354                         update(time_of_day, time_brightness, direct_brightness,
 355                                         sunlight_seen, cam_mode, yaw, pitch);
 356                 }
 357                 return;
 358         }
 359
 360         m_time_of_day = time_of_day;
 361         m_time_brightness = time_brightness;
 362         m_sunlight_seen = sunlight_seen;
 363         m_in_clouds = false;
 364
 365         bool is_dawn = (time_brightness >= 0.20 && time_brightness < 0.35);
 366
 367         video::SColorf bgcolor_bright_normal_f = m_sky_params.sky_color.day_horizon;
 368         video::SColorf bgcolor_bright_indoor_f = m_sky_params.sky_color.indoors;
 369         video::SColorf bgcolor_bright_dawn_f = m_sky_params.sky_color.dawn_horizon;
 370         video::SColorf bgcolor_bright_night_f = m_sky_params.sky_color.night_horizon;
 371
 372         video::SColorf skycolor_bright_normal_f = m_sky_params.sky_color.day_sky;
 373         video::SColorf skycolor_bright_dawn_f = m_sky_params.sky_color.dawn_sky;
 374         video::SColorf skycolor_bright_night_f = m_sky_params.sky_color.night_sky;
 375
 376         video::SColorf cloudcolor_bright_normal_f = m_cloudcolor_day_f;
 377         video::SColorf cloudcolor_bright_dawn_f = m_cloudcolor_dawn_f;
 378
 379         float cloud_color_change_fraction = 0.95;
 380         if (sunlight_seen) {
 381                 if (std::fabs(time_brightness - m_brightness) < 0.2f) {
 382                         m_brightness = m_brightness * 0.95 + time_brightness * 0.05;
 383                 } else {
 384                         m_brightness = m_brightness * 0.80 + time_brightness * 0.20;
 385                         cloud_color_change_fraction = 0.0;
 386                 }
 387         } else {
 388                 if (direct_brightness < m_brightness)
 389                         m_brightness = m_brightness * 0.95 + direct_brightness * 0.05;
 390                 else
 391                         m_brightness = m_brightness * 0.98 + direct_brightness * 0.02;
 392         }
 393
 394         m_clouds_visible = true;
 395         float color_change_fraction = 0.98f;
 396         if (sunlight_seen) {
 397                 if (is_dawn) { // Dawn
 398                         m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 399                                 bgcolor_bright_dawn_f, color_change_fraction);
 400                         m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 401                                 skycolor_bright_dawn_f, color_change_fraction);
 402                         m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 403                                 cloudcolor_bright_dawn_f, color_change_fraction);
 404                 } else {
 405                         if (time_brightness < 0.13f) { // Night
 406                                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 407                                         bgcolor_bright_night_f, color_change_fraction);
 408                                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 409                                         skycolor_bright_night_f, color_change_fraction);
 410                         } else { // Day
 411                                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 412                                         bgcolor_bright_normal_f, color_change_fraction);
 413                                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 414                                         skycolor_bright_normal_f, color_change_fraction);
 415                         }
 416
 417                         m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 418                                 cloudcolor_bright_normal_f, color_change_fraction);
 419                 }
 420         } else {
 421                 m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
 422                         bgcolor_bright_indoor_f, color_change_fraction);
 423                 m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
 424                         bgcolor_bright_indoor_f, color_change_fraction);
 425                 m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
 426                         cloudcolor_bright_normal_f, color_change_fraction);
 427                 m_clouds_visible = false;
 428         }
 429
 430         video::SColor bgcolor_bright = m_bgcolor_bright_f.toSColor();
 431         m_bgcolor = video::SColor(
 432                 255,
 433                 bgcolor_bright.getRed() * m_brightness,
 434                 bgcolor_bright.getGreen() * m_brightness,
 435                 bgcolor_bright.getBlue() * m_brightness
 436         );
 437
 438         video::SColor skycolor_bright = m_skycolor_bright_f.toSColor();
 439         m_skycolor = video::SColor(
 440                 255,
 441                 skycolor_bright.getRed() * m_brightness,
 442                 skycolor_bright.getGreen() * m_brightness,
 443                 skycolor_bright.getBlue() * m_brightness
 444         );
 445
 446         // Horizon coloring based on sun and moon direction during sunset and sunrise
 447         video::SColor pointcolor = video::SColor(m_bgcolor.getAlpha(), 255, 255, 255);
 448         if (m_directional_colored_fog) {
 449                 if (m_horizon_blend() != 0) {
 450                         // Calculate hemisphere value from yaw, (inverted in third person front view)
 451                         s8 dir_factor = 1;
 452                         if (cam_mode > CAMERA_MODE_THIRD)
 453                                 dir_factor = -1;
 454                         f32 pointcolor_blend = wrapDegrees_0_360(yaw * dir_factor + 90);
 455                         if (pointcolor_blend > 180)
 456                                 pointcolor_blend = 360 - pointcolor_blend;
 457                         pointcolor_blend /= 180;
 458                         // Bound view angle to determine where transition starts and ends
 459                         pointcolor_blend = rangelim(1 - pointcolor_blend * 1.375, 0, 1 / 1.375) *
 460                                 1.375;
 461                         // Combine the colors when looking up or down, otherwise turning looks weird
 462                         pointcolor_blend += (0.5 - pointcolor_blend) *
 463                                 (1 - MYMIN((90 - std::fabs(pitch)) / 90 * 1.5, 1));
 464                         // Invert direction to match where the sun and moon are rising
 465                         if (m_time_of_day > 0.5)
 466                                 pointcolor_blend = 1 - pointcolor_blend;
 467                         // Horizon colors of sun and moon
 468                         f32 pointcolor_light = rangelim(m_time_brightness * 3, 0.2, 1);
 469
 470                         video::SColorf pointcolor_sun_f(1, 1, 1, 1);
 471                         // Use tonemap only if default sun/moon tinting is used
 472                         // which keeps previous behaviour.
 473                         if (m_sun_tonemap && m_default_tint) {
 474                                 pointcolor_sun_f.r = pointcolor_light *
 475                                         (float)m_materials[3].EmissiveColor.getRed() / 255;
 476                                 pointcolor_sun_f.b = pointcolor_light *
 477                                         (float)m_materials[3].EmissiveColor.getBlue() / 255;
 478                                 pointcolor_sun_f.g = pointcolor_light *
 479                                         (float)m_materials[3].EmissiveColor.getGreen() / 255;
 480                         } else if (!m_default_tint) {
 481                                 pointcolor_sun_f = m_sky_params.fog_sun_tint;
 482                         } else {
 483                                 pointcolor_sun_f.r = pointcolor_light * 1;
 484                                 pointcolor_sun_f.b = pointcolor_light *
 485                                         (0.25 + (rangelim(m_time_brightness, 0.25, 0.75) - 0.25) * 2 * 0.75);
 486                                 pointcolor_sun_f.g = pointcolor_light * (pointcolor_sun_f.b * 0.375 +
 487                                         (rangelim(m_time_brightness, 0.05, 0.15) - 0.05) * 10 * 0.625);
 488                         }
 489
 490                         video::SColorf pointcolor_moon_f;
 491                         if (m_default_tint) {
 492                                 pointcolor_moon_f = video::SColorf(
 493                                         0.5 * pointcolor_light,
 494                                         0.6 * pointcolor_light,
 495                                         0.8 * pointcolor_light,
 496                                         1
 497                                 );
 498                         } else {
 499                                 pointcolor_moon_f = video::SColorf(
 500                                         (m_sky_params.fog_moon_tint.getRed() / 255) * pointcolor_light,
 501                                         (m_sky_params.fog_moon_tint.getGreen() / 255) * pointcolor_light,
 502                                         (m_sky_params.fog_moon_tint.getBlue() / 255) * pointcolor_light,
 503                                         1
 504                                 );
 505                         }
 506                         if (m_moon_tonemap && m_default_tint) {
 507                                 pointcolor_moon_f.r = pointcolor_light *
 508                                         (float)m_materials[4].EmissiveColor.getRed() / 255;
 509                                 pointcolor_moon_f.b = pointcolor_light *
 510                                         (float)m_materials[4].EmissiveColor.getBlue() / 255;
 511                                 pointcolor_moon_f.g = pointcolor_light *
 512                                         (float)m_materials[4].EmissiveColor.getGreen() / 255;
 513                         }
 514
 515                         video::SColor pointcolor_sun = pointcolor_sun_f.toSColor();
 516                         video::SColor pointcolor_moon = pointcolor_moon_f.toSColor();
 517                         // Calculate the blend color
 518                         pointcolor = m_mix_scolor(pointcolor_moon, pointcolor_sun, pointcolor_blend);
 519                 }
 520                 m_bgcolor = m_mix_scolor(m_bgcolor, pointcolor, m_horizon_blend() * 0.5);
 521                 m_skycolor = m_mix_scolor(m_skycolor, pointcolor, m_horizon_blend() * 0.25);
 522         }
 523
 524         float cloud_direct_brightness = 0.0f;
 525         if (sunlight_seen) {
 526                 if (!m_directional_colored_fog) {
 527                         cloud_direct_brightness = time_brightness;
 528                         // Boost cloud brightness relative to sky, at dawn, dusk and at night
 529                         if (time_brightness < 0.7f)
 530                                 cloud_direct_brightness *= 1.3f;
 531                 } else {
 532                         cloud_direct_brightness = std::fmin(m_horizon_blend() * 0.15f +
 533                                 m_time_brightness, 1.0f);
 534                         // Set the same minimum cloud brightness at night
 535                         if (time_brightness < 0.5f)
 536                                 cloud_direct_brightness = std::fmax(cloud_direct_brightness,
 537                                         time_brightness * 1.3f);
 538                 }
 539         } else {
 540                 cloud_direct_brightness = direct_brightness;
 541         }
 542
 543         m_cloud_brightness = m_cloud_brightness * cloud_color_change_fraction +
 544                 cloud_direct_brightness * (1.0 - cloud_color_change_fraction);
 545         m_cloudcolor_f = video::SColorf(
 546                 m_cloudcolor_bright_f.r * m_cloud_brightness,
 547                 m_cloudcolor_bright_f.g * m_cloud_brightness,
 548                 m_cloudcolor_bright_f.b * m_cloud_brightness,
 549                 1.0
 550         );
 551         if (m_directional_colored_fog) {
 552                 m_cloudcolor_f = m_mix_scolorf(m_cloudcolor_f,
 553                         video::SColorf(pointcolor), m_horizon_blend() * 0.25);
 554         }
 555 }
 556
 557 void Sky::draw_sun(video::IVideoDriver *driver, float sunsize, const video::SColor &suncolor,
 558         const video::SColor &suncolor2, float wicked_time_of_day)
 559         /* Draw sun in the sky.
 560          * driver: Video driver object used to draw
 561          * sunsize: the default size of the sun
 562          * suncolor: main sun color
 563          * suncolor2: second sun color
 564          * wicked_time_of_day: current time of day, to know where should be the sun in the sky
 565          */
 566 {
 567         static const u16 indices[] = {0, 1, 2, 0, 2, 3};
 568         std::array<video::S3DVertex, 4> vertices;
 569         if (!m_sun_texture) {
 570                 driver->setMaterial(m_materials[1]);
 571                 const float sunsizes[4] = {
 572                         (sunsize * 1.7f) * m_sun_params.scale,
 573                         (sunsize * 1.2f) * m_sun_params.scale,
 574                         (sunsize) * m_sun_params.scale,
 575                         (sunsize * 0.7f) * m_sun_params.scale
 576                 };
 577                 video::SColor c1 = suncolor;
 578                 video::SColor c2 = suncolor;
 579                 c1.setAlpha(0.05 * 255);
 580                 c2.setAlpha(0.15 * 255);
 581                 const video::SColor colors[4] = {c1, c2, suncolor, suncolor2};
 582                 for (int i = 0; i < 4; i++) {
 583                         draw_sky_body(vertices, -sunsizes[i], sunsizes[i], colors[i]);
 584                         place_sky_body(vertices, 90, wicked_time_of_day * 360 - 90);
 585                         driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 586                 }
 587         } else {
 588                 driver->setMaterial(m_materials[3]);
 589                 float d = (sunsize * 1.7) * m_sun_params.scale;
 590                 video::SColor c;
 591                 if (m_sun_tonemap)
 592                         c = video::SColor(0, 0, 0, 0);
 593                 else
 594                         c = video::SColor(255, 255, 255, 255);
 595                 draw_sky_body(vertices, -d, d, c);
 596                 place_sky_body(vertices, 90, wicked_time_of_day * 360 - 90);
 597                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 598         }
 599 }
 600
 601
 602 void Sky::draw_moon(video::IVideoDriver *driver, float moonsize, const video::SColor &mooncolor,
 603         const video::SColor &mooncolor2, float wicked_time_of_day)
 604 /*
 605         * Draw moon in the sky.
 606         * driver: Video driver object used to draw
 607         * moonsize: the default size of the moon
 608         * mooncolor: main moon color
 609         * mooncolor2: second moon color
 610         * wicked_time_of_day: current time of day, to know where should be the moon in
 611         * the sky
 612         */
 613 {
 614         static const u16 indices[] = {0, 1, 2, 0, 2, 3};
 615         std::array<video::S3DVertex, 4> vertices;
 616         if (!m_moon_texture) {
 617                 driver->setMaterial(m_materials[1]);
 618                 const float moonsizes_1[4] = {
 619                         (-moonsize * 1.9f) * m_moon_params.scale,
 620                         (-moonsize * 1.3f) * m_moon_params.scale,
 621                         (-moonsize) * m_moon_params.scale,
 622                         (-moonsize) * m_moon_params.scale
 623                 };
 624                 const float moonsizes_2[4] = {
 625                         (moonsize * 1.9f) * m_moon_params.scale,
 626                         (moonsize * 1.3f) * m_moon_params.scale,
 627                         (moonsize) *m_moon_params.scale,
 628                         (moonsize * 0.6f) * m_moon_params.scale
 629                 };
 630                 video::SColor c1 = mooncolor;
 631                 video::SColor c2 = mooncolor;
 632                 c1.setAlpha(0.05 * 255);
 633                 c2.setAlpha(0.15 * 255);
 634                 const video::SColor colors[4] = {c1, c2, mooncolor, mooncolor2};
 635                 for (int i = 0; i < 4; i++) {
 636                         draw_sky_body(vertices, moonsizes_1[i], moonsizes_2[i], colors[i]);
 637                         place_sky_body(vertices, -90, wicked_time_of_day * 360 - 90);
 638                         driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 639                 }
 640         } else {
 641                 driver->setMaterial(m_materials[4]);
 642                 float d = (moonsize * 1.9) * m_moon_params.scale;
 643                 video::SColor c;
 644                 if (m_moon_tonemap)
 645                         c = video::SColor(0, 0, 0, 0);
 646                 else
 647                         c = video::SColor(255, 255, 255, 255);
 648                 draw_sky_body(vertices, -d, d, c);
 649                 place_sky_body(vertices, -90, wicked_time_of_day * 360 - 90);
 650                 driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 651         }
 652 }
 653
 654 void Sky::draw_stars(video::IVideoDriver * driver, float wicked_time_of_day)
 655 {
 656         // Tune values so that stars first appear just after the sun
 657         // disappears over the horizon, and disappear just before the sun
 658         // appears over the horizon.
 659         // Also tune so that stars are at full brightness from time 20000
 660         // to time 4000.
 661
 662         float tod = wicked_time_of_day < 0.5f ? wicked_time_of_day : (1.0f - wicked_time_of_day);
 663         float starbrightness = (0.25f - fabsf(tod)) * 20.0f;
 664         m_star_color = m_star_params.starcolor;
 665         m_star_color.a *= clamp(starbrightness, 0.0f, 1.0f);
 666         if (m_star_color.a <= 0.0f) // Stars are only drawn when not fully transparent
 667                 return;
 668         m_materials[0].DiffuseColor = m_materials[0].EmissiveColor = m_star_color.toSColor();
 669         auto sky_rotation = core::matrix4().setRotationAxisRadians(2.0f * M_PI * (wicked_time_of_day - 0.25f), v3f(0.0f, 0.0f, 1.0f));
 670         auto world_matrix = driver->getTransform(video::ETS_WORLD);
 671         driver->setTransform(video::ETS_WORLD, world_matrix * sky_rotation);
 672         driver->setMaterial(m_materials[0]);
 673         driver->drawMeshBuffer(m_stars.get());
 674         driver->setTransform(video::ETS_WORLD, world_matrix);
 675 }
 676
 677 void Sky::draw_sky_body(std::array<video::S3DVertex, 4> &vertices, float pos_1, float pos_2, const video::SColor &c)
 678 {
 679         /*
 680         * Create an array of vertices with the dimensions specified.
 681         * pos_1, pos_2: position of the body's vertices
 682         * c: color of the body
 683         */
 684
 685         const f32 t = 1.0f;
 686         const f32 o = 0.0f;
 687         vertices[0] = video::S3DVertex(pos_1, pos_1, -1, 0, 0, 1, c, t, t);
 688         vertices[1] = video::S3DVertex(pos_2, pos_1, -1, 0, 0, 1, c, o, t);
 689         vertices[2] = video::S3DVertex(pos_2, pos_2, -1, 0, 0, 1, c, o, o);
 690         vertices[3] = video::S3DVertex(pos_1, pos_2, -1, 0, 0, 1, c, t, o);
 691 }
 692
 693
 694 void Sky::place_sky_body(
 695         std::array<video::S3DVertex, 4> &vertices, float horizon_position, float day_position)
 696         /*
 697         * Place body in the sky.
 698         * vertices: The body as a rectangle of 4 vertices
 699         * horizon_position: turn the body around the Y axis
 700         * day_position: turn the body around the Z axis, to place it depending of the time of the day
 701         */
 702 {
 703         v3f centrum(0, 0, -1);
 704         centrum.rotateXZBy(horizon_position);
 705         centrum.rotateXYBy(day_position);
 706         centrum.rotateYZBy(m_sky_body_orbit_tilt);
 707         for (video::S3DVertex &vertex : vertices) {
 708                 // Body is directed to -Z (south) by default
 709                 vertex.Pos.rotateXZBy(horizon_position);
 710                 vertex.Pos.rotateXYBy(day_position);
 711                 vertex.Pos.Z += centrum.Z;
 712         }
 713 }
 714
 715 void Sky::setSunTexture(const std::string &sun_texture,
 716                 const std::string &sun_tonemap, ITextureSource *tsrc)
 717 {
 718         // Ignore matching textures (with modifiers) entirely,
 719         // but lets at least update the tonemap before hand.
 720         m_sun_params.tonemap = sun_tonemap;
 721         m_sun_tonemap = tsrc->isKnownSourceImage(sun_tonemap) ?
 722                 tsrc->getTexture(sun_tonemap) : nullptr;
 723         m_materials[3].Lighting = !!m_sun_tonemap;
 724
 725         if (m_sun_params.texture == sun_texture && !m_first_update)
 726                 return;
 727         m_sun_params.texture = sun_texture;
 728
 729         m_sun_texture = nullptr;
 730         if (sun_texture == "sun.png") {
 731                 // Dumb compatibility fix: sun.png transparently falls back to no texture
 732                 m_sun_texture = tsrc->isKnownSourceImage(sun_texture) ?
 733                         tsrc->getTexture(sun_texture) : nullptr;
 734         } else if (!sun_texture.empty()) {
 735                 m_sun_texture = tsrc->getTextureForMesh(sun_texture);
 736         }
 737
 738         if (m_sun_texture) {
 739                 m_materials[3] = baseMaterial();
 740                 m_materials[3].setTexture(0, m_sun_texture);
 741                 m_materials[3].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 742                 disableTextureFiltering(m_materials[3]);
 743                 m_materials[3].Lighting = !!m_sun_tonemap;
 744         }
 745 }
 746
 747 void Sky::setSunriseTexture(const std::string &sunglow_texture,
 748                 ITextureSource* tsrc)
 749 {
 750         // Ignore matching textures (with modifiers) entirely.
 751         if (m_sun_params.sunrise == sunglow_texture)
 752                 return;
 753         m_sun_params.sunrise = sunglow_texture;
 754         m_materials[2].setTexture(0, tsrc->getTextureForMesh(
 755                 sunglow_texture.empty() ? "sunrisebg.png" : sunglow_texture)
 756         );
 757 }
 758
 759 void Sky::setMoonTexture(const std::string &moon_texture,
 760         const std::string &moon_tonemap, ITextureSource *tsrc)
 761 {
 762         // Ignore matching textures (with modifiers) entirely,
 763         // but lets at least update the tonemap before hand.
 764         m_moon_params.tonemap = moon_tonemap;
 765         m_moon_tonemap = tsrc->isKnownSourceImage(moon_tonemap) ?
 766                 tsrc->getTexture(moon_tonemap) : nullptr;
 767         m_materials[4].Lighting = !!m_moon_tonemap;
 768
 769         if (m_moon_params.texture == moon_texture && !m_first_update)
 770                 return;
 771         m_moon_params.texture = moon_texture;
 772
 773         m_moon_texture = nullptr;
 774         if (moon_texture == "moon.png") {
 775                 // Dumb compatibility fix: moon.png transparently falls back to no texture
 776                 m_moon_texture = tsrc->isKnownSourceImage(moon_texture) ?
 777                         tsrc->getTexture(moon_texture) : nullptr;
 778         } else if (!moon_texture.empty()) {
 779                 m_moon_texture = tsrc->getTextureForMesh(moon_texture);
 780         }
 781
 782         if (m_moon_texture) {
 783                 m_materials[4] = baseMaterial();
 784                 m_materials[4].setTexture(0, m_moon_texture);
 785                 m_materials[4].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 786                 disableTextureFiltering(m_materials[4]);
 787                 m_materials[4].Lighting = !!m_moon_tonemap;
 788         }
 789 }
 790
 791 void Sky::setStarCount(u16 star_count)
 792 {
 793         // Allow force updating star count at game init.
 794         if (m_star_params.count != star_count || m_first_update) {
 795                 m_star_params.count = star_count;
 796                 updateStars();
 797         }
 798 }
 799
 800 void Sky::updateStars()
 801 {
 802         m_stars.reset(new scene::SMeshBuffer());
 803         // Stupid IrrLicht doesn’t allow non-indexed rendering, and indexed quad
 804         // rendering is slow due to lack of hardware support. So as indices are
 805         // 16-bit and there are 4 vertices per star... the limit is 2^16/4 = 0x4000.
 806         // That should be well enough actually.
 807         if (m_star_params.count > 0x4000) {
 808                 warningstream << "Requested " << m_star_params.count << " stars but " << 0x4000 << " is the max\n";
 809                 m_star_params.count = 0x4000;
 810         }
 811         m_stars->Vertices.reallocate(4 * m_star_params.count);
 812         m_stars->Indices.reallocate(6 * m_star_params.count);
 813
 814         video::SColor fallback_color = m_star_params.starcolor; // used on GLES 2 “without shaders”
 815         PcgRandom rgen(m_seed);
 816         float d = (0.006 / 2) * m_star_params.scale;
 817         for (u16 i = 0; i < m_star_params.count; i++) {
 818                 v3f r = v3f(
 819                         rgen.range(-10000, 10000),
 820                         rgen.range(-10000, 10000),
 821                         rgen.range(-10000, 10000)
 822                 );
 823                 core::CMatrix4<f32> a;
 824                 a.buildRotateFromTo(v3f(0, 1, 0), r);
 825                 v3f p = v3f(-d, 1, -d);
 826                 v3f p1 = v3f(d, 1, -d);
 827                 v3f p2 = v3f(d, 1, d);
 828                 v3f p3 = v3f(-d, 1, d);
 829                 a.rotateVect(p);
 830                 a.rotateVect(p1);
 831                 a.rotateVect(p2);
 832                 a.rotateVect(p3);
 833                 m_stars->Vertices.push_back(video::S3DVertex(p, {}, fallback_color, {}));
 834                 m_stars->Vertices.push_back(video::S3DVertex(p1, {}, fallback_color, {}));
 835                 m_stars->Vertices.push_back(video::S3DVertex(p2, {}, fallback_color, {}));
 836                 m_stars->Vertices.push_back(video::S3DVertex(p3, {}, fallback_color, {}));
 837         }
 838         for (u16 i = 0; i < m_star_params.count; i++) {
 839                 m_stars->Indices.push_back(i * 4 + 0);
 840                 m_stars->Indices.push_back(i * 4 + 1);
 841                 m_stars->Indices.push_back(i * 4 + 2);
 842                 m_stars->Indices.push_back(i * 4 + 2);
 843                 m_stars->Indices.push_back(i * 4 + 3);
 844                 m_stars->Indices.push_back(i * 4 + 0);
 845         }
 846         m_stars->setHardwareMappingHint(scene::EHM_STATIC);
 847 }
 848
 849 void Sky::setSkyColors(const SkyColor &sky_color)
 850 {
 851         m_sky_params.sky_color = sky_color;
 852 }
 853
 854 void Sky::setHorizonTint(video::SColor sun_tint, video::SColor moon_tint,
 855         const std::string &use_sun_tint)
 856 {
 857         // Change sun and moon tinting:
 858         m_sky_params.fog_sun_tint = sun_tint;
 859         m_sky_params.fog_moon_tint = moon_tint;
 860         // Faster than comparing strings every rendering frame
 861         if (use_sun_tint == "default")
 862                 m_default_tint = true;
 863         else if (use_sun_tint == "custom")
 864                 m_default_tint = false;
 865         else
 866                 m_default_tint = true;
 867 }
 868
 869 void Sky::addTextureToSkybox(const std::string &texture, int material_id,
 870                 ITextureSource *tsrc)
 871 {
 872         // Sanity check for more than six textures.
 873         if (material_id + 5 >= SKY_MATERIAL_COUNT)
 874                 return;
 875         // Keep a list of texture names handy.
 876         m_sky_params.textures.emplace_back(texture);
 877         video::ITexture *result = tsrc->getTextureForMesh(texture);
 878         m_materials[material_id+5] = baseMaterial();
 879         m_materials[material_id+5].setTexture(0, result);
 880         m_materials[material_id+5].MaterialType = video::EMT_SOLID;
 881 }
 882
 883 float getWickedTimeOfDay(float time_of_day)
 884 {
 885         float nightlength = 0.415f;
 886         float wn = nightlength / 2;
 887         float wicked_time_of_day = 0;
 888         if (time_of_day > wn && time_of_day < 1.0f - wn)
 889                 wicked_time_of_day = (time_of_day - wn) / (1.0f - wn * 2) * 0.5f + 0.25f;
 890         else if (time_of_day < 0.5f)
 891                 wicked_time_of_day = time_of_day / wn * 0.25f;
 892         else
 893                 wicked_time_of_day = 1.0f - ((1.0f - time_of_day) / wn * 0.25f);
 894         return wicked_time_of_day;
 895 }