src/clouds.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "clouds.h"
  21 #include "noise.h"
  22 #include "constants.h"
  23 #include "debug.h"
  24 #include "profiler.h"
  25 #include "settings.h"
  26
  27
  28 // Menu clouds are created later
  29 class Clouds;
  30 Clouds *g_menuclouds = NULL;
  31 irr::scene::ISceneManager *g_menucloudsmgr = NULL;
  32
  33 static void cloud_3d_setting_changed(const std::string &settingname, void *data)
  34 {
  35         // TODO: only re-read cloud settings, not height or radius
  36         ((Clouds *)data)->readSettings();
  37 }
  38
  39 Clouds::Clouds(
  40                 scene::ISceneNode* parent,
  41                 scene::ISceneManager* mgr,
  42                 s32 id,
  43                 u32 seed,
  44                 s16 cloudheight
  45 ):
  46         scene::ISceneNode(parent, mgr, id),
  47         m_seed(seed)
  48 {
  49         m_material.setFlag(video::EMF_LIGHTING, false);
  50         //m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
  51         m_material.setFlag(video::EMF_BACK_FACE_CULLING, true);
  52         m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
  53         m_material.setFlag(video::EMF_FOG_ENABLE, true);
  54         m_material.setFlag(video::EMF_ANTI_ALIASING, true);
  55         //m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  56         m_material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  57
  58         m_params.density       = 0.4f;
  59         m_params.thickness     = 16.0f;
  60         m_params.color_bright  = video::SColor(229, 240, 240, 255);
  61         m_params.color_ambient = video::SColor(255, 0, 0, 0);
  62         m_params.speed         = v2f(0.0f, -2.0f);
  63
  64         m_passed_cloud_y = cloudheight;
  65         readSettings();
  66         g_settings->registerChangedCallback("enable_3d_clouds",
  67                 &cloud_3d_setting_changed, this);
  68
  69         updateBox();
  70 }
  71
  72 Clouds::~Clouds()
  73 {
  74         g_settings->deregisterChangedCallback("enable_3d_clouds",
  75                 &cloud_3d_setting_changed, this);
  76 }
  77
  78 void Clouds::OnRegisterSceneNode()
  79 {
  80         if(IsVisible)
  81         {
  82                 SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
  83                 //SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
  84         }
  85
  86         ISceneNode::OnRegisterSceneNode();
  87 }
  88
  89 #define MYROUND(x) (x > 0.0 ? (int)x : (int)x - 1)
  90
  91 void Clouds::render()
  92 {
  93
  94         if (m_params.density <= 0.0f)
  95                 return; // no need to do anything
  96
  97         video::IVideoDriver* driver = SceneManager->getVideoDriver();
  98
  99         if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
 100         //if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
 101                 return;
 102
 103         ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
 104
 105         int num_faces_to_draw = m_enable_3d ? 6 : 1;
 106
 107         m_material.setFlag(video::EMF_BACK_FACE_CULLING, m_enable_3d);
 108
 109         driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
 110         driver->setMaterial(m_material);
 111
 112         /*
 113                 Clouds move from Z+ towards Z-
 114         */
 115
 116         static const float cloud_size = BS * 64.0f;
 117
 118         const float cloud_full_radius = cloud_size * m_cloud_radius_i;
 119
 120         // Position of cloud noise origin from the camera
 121         v2f cloud_origin_from_camera_f = m_origin - m_camera_pos;
 122         // The center point of drawing in the noise
 123         v2f center_of_drawing_in_noise_f = -cloud_origin_from_camera_f;
 124         // The integer center point of drawing in the noise
 125         v2s16 center_of_drawing_in_noise_i(
 126                 MYROUND(center_of_drawing_in_noise_f.X / cloud_size),
 127                 MYROUND(center_of_drawing_in_noise_f.Y / cloud_size)
 128         );
 129         // The world position of the integer center point of drawing in the noise
 130         v2f world_center_of_drawing_in_noise_f = v2f(
 131                 center_of_drawing_in_noise_i.X * cloud_size,
 132                 center_of_drawing_in_noise_i.Y * cloud_size
 133         ) + m_origin;
 134
 135         /*video::SColor c_top(128,b*240,b*240,b*255);
 136         video::SColor c_side_1(128,b*230,b*230,b*255);
 137         video::SColor c_side_2(128,b*220,b*220,b*245);
 138         video::SColor c_bottom(128,b*205,b*205,b*230);*/
 139         video::SColorf c_top_f(m_color);
 140         video::SColorf c_side_1_f(m_color);
 141         video::SColorf c_side_2_f(m_color);
 142         video::SColorf c_bottom_f(m_color);
 143         c_side_1_f.r *= 0.95;
 144         c_side_1_f.g *= 0.95;
 145         c_side_1_f.b *= 0.95;
 146         c_side_2_f.r *= 0.90;
 147         c_side_2_f.g *= 0.90;
 148         c_side_2_f.b *= 0.90;
 149         c_bottom_f.r *= 0.80;
 150         c_bottom_f.g *= 0.80;
 151         c_bottom_f.b *= 0.80;
 152         video::SColor c_top = c_top_f.toSColor();
 153         video::SColor c_side_1 = c_side_1_f.toSColor();
 154         video::SColor c_side_2 = c_side_2_f.toSColor();
 155         video::SColor c_bottom = c_bottom_f.toSColor();
 156
 157         // Get fog parameters for setting them back later
 158         video::SColor fog_color(0,0,0,0);
 159         video::E_FOG_TYPE fog_type = video::EFT_FOG_LINEAR;
 160         f32 fog_start = 0;
 161         f32 fog_end = 0;
 162         f32 fog_density = 0;
 163         bool fog_pixelfog = false;
 164         bool fog_rangefog = false;
 165         driver->getFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 166                         fog_pixelfog, fog_rangefog);
 167
 168         // Set our own fog
 169         driver->setFog(fog_color, fog_type, cloud_full_radius * 0.5,
 170                         cloud_full_radius*1.2, fog_density, fog_pixelfog, fog_rangefog);
 171
 172         // Read noise
 173
 174         bool *grid = new bool[m_cloud_radius_i * 2 * m_cloud_radius_i * 2];
 175
 176         float cloud_size_noise = cloud_size / BS / 200;
 177
 178         for(s16 zi = -m_cloud_radius_i; zi < m_cloud_radius_i; zi++) {
 179                 u32 si = (zi + m_cloud_radius_i) * m_cloud_radius_i * 2 + m_cloud_radius_i;
 180
 181                 for (s16 xi = -m_cloud_radius_i; xi < m_cloud_radius_i; xi++) {
 182                         u32 i = si + xi;
 183
 184                         v2s16 p_in_noise_i(
 185                                 xi + center_of_drawing_in_noise_i.X,
 186                                 zi + center_of_drawing_in_noise_i.Y
 187                         );
 188
 189                         float noise = noise2d_perlin(
 190                                         (float)p_in_noise_i.X * cloud_size_noise,
 191                                         (float)p_in_noise_i.Y * cloud_size_noise,
 192                                         m_seed, 3, 0.5);
 193                         // normalize to 0..1 (given 3 octaves)
 194                         static const float noise_bound = 1.0f + 0.5f + 0.25f;
 195                         float density = noise / noise_bound * 0.5f + 0.5f;
 196                         grid[i] = (density < m_params.density);
 197                 }
 198         }
 199
 200 #define GETINDEX(x, z, radius) (((z)+(radius))*(radius)*2 + (x)+(radius))
 201 #define INAREA(x, z, radius) \
 202         ((x) >= -(radius) && (x) < (radius) && (z) >= -(radius) && (z) < (radius))
 203
 204         for (s16 zi0= -m_cloud_radius_i; zi0 < m_cloud_radius_i; zi0++)
 205         for (s16 xi0= -m_cloud_radius_i; xi0 < m_cloud_radius_i; xi0++)
 206         {
 207                 s16 zi = zi0;
 208                 s16 xi = xi0;
 209                 // Draw from front to back (needed for transparency)
 210                 /*if(zi <= 0)
 211                         zi = -m_cloud_radius_i - zi;
 212                 if(xi <= 0)
 213                         xi = -m_cloud_radius_i - xi;*/
 214                 // Draw from back to front
 215                 if(zi >= 0)
 216                         zi = m_cloud_radius_i - zi - 1;
 217                 if(xi >= 0)
 218                         xi = m_cloud_radius_i - xi - 1;
 219
 220                 u32 i = GETINDEX(xi, zi, m_cloud_radius_i);
 221
 222                 if(grid[i] == false)
 223                         continue;
 224
 225                 v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
 226
 227                 video::S3DVertex v[4] = {
 228                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 1),
 229                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 1),
 230                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 0),
 231                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 0)
 232                 };
 233
 234                 /*if(zi <= 0 && xi <= 0){
 235                         v[0].Color.setBlue(255);
 236                         v[1].Color.setBlue(255);
 237                         v[2].Color.setBlue(255);
 238                         v[3].Color.setBlue(255);
 239                 }*/
 240
 241                 f32 rx = cloud_size / 2.0f;
 242                 // if clouds are flat, the top layer should be at the given height
 243                 f32 ry = m_enable_3d ? m_params.thickness * BS : 0.0f;
 244                 f32 rz = cloud_size / 2;
 245
 246                 for(int i=0; i<num_faces_to_draw; i++)
 247                 {
 248                         switch(i)
 249                         {
 250                         case 0: // top
 251                                 for(int j=0;j<4;j++){
 252                                         v[j].Normal.set(0,1,0);
 253                                 }
 254                                 v[0].Pos.set(-rx, ry,-rz);
 255                                 v[1].Pos.set(-rx, ry, rz);
 256                                 v[2].Pos.set( rx, ry, rz);
 257                                 v[3].Pos.set( rx, ry,-rz);
 258                                 break;
 259                         case 1: // back
 260                                 if (INAREA(xi, zi - 1, m_cloud_radius_i)) {
 261                                         u32 j = GETINDEX(xi, zi - 1, m_cloud_radius_i);
 262                                         if(grid[j])
 263                                                 continue;
 264                                 }
 265                                 for(int j=0;j<4;j++){
 266                                         v[j].Color = c_side_1;
 267                                         v[j].Normal.set(0,0,-1);
 268                                 }
 269                                 v[0].Pos.set(-rx, ry,-rz);
 270                                 v[1].Pos.set( rx, ry,-rz);
 271                                 v[2].Pos.set( rx,  0,-rz);
 272                                 v[3].Pos.set(-rx,  0,-rz);
 273                                 break;
 274                         case 2: //right
 275                                 if (INAREA(xi + 1, zi, m_cloud_radius_i)) {
 276                                         u32 j = GETINDEX(xi+1, zi, m_cloud_radius_i);
 277                                         if(grid[j])
 278                                                 continue;
 279                                 }
 280                                 for(int j=0;j<4;j++){
 281                                         v[j].Color = c_side_2;
 282                                         v[j].Normal.set(1,0,0);
 283                                 }
 284                                 v[0].Pos.set( rx, ry,-rz);
 285                                 v[1].Pos.set( rx, ry, rz);
 286                                 v[2].Pos.set( rx,  0, rz);
 287                                 v[3].Pos.set( rx,  0,-rz);
 288                                 break;
 289                         case 3: // front
 290                                 if (INAREA(xi, zi + 1, m_cloud_radius_i)) {
 291                                         u32 j = GETINDEX(xi, zi + 1, m_cloud_radius_i);
 292                                         if(grid[j])
 293                                                 continue;
 294                                 }
 295                                 for(int j=0;j<4;j++){
 296                                         v[j].Color = c_side_1;
 297                                         v[j].Normal.set(0,0,-1);
 298                                 }
 299                                 v[0].Pos.set( rx, ry, rz);
 300                                 v[1].Pos.set(-rx, ry, rz);
 301                                 v[2].Pos.set(-rx,  0, rz);
 302                                 v[3].Pos.set( rx,  0, rz);
 303                                 break;
 304                         case 4: // left
 305                                 if (INAREA(xi-1, zi, m_cloud_radius_i)) {
 306                                         u32 j = GETINDEX(xi-1, zi, m_cloud_radius_i);
 307                                         if(grid[j])
 308                                                 continue;
 309                                 }
 310                                 for(int j=0;j<4;j++){
 311                                         v[j].Color = c_side_2;
 312                                         v[j].Normal.set(-1,0,0);
 313                                 }
 314                                 v[0].Pos.set(-rx, ry, rz);
 315                                 v[1].Pos.set(-rx, ry,-rz);
 316                                 v[2].Pos.set(-rx,  0,-rz);
 317                                 v[3].Pos.set(-rx,  0, rz);
 318                                 break;
 319                         case 5: // bottom
 320                                 for(int j=0;j<4;j++){
 321                                         v[j].Color = c_bottom;
 322                                         v[j].Normal.set(0,-1,0);
 323                                 }
 324                                 v[0].Pos.set( rx,  0, rz);
 325                                 v[1].Pos.set(-rx,  0, rz);
 326                                 v[2].Pos.set(-rx,  0,-rz);
 327                                 v[3].Pos.set( rx,  0,-rz);
 328                                 break;
 329                         }
 330
 331                         v3f pos(p0.X, m_params.height * BS, p0.Y);
 332                         pos -= intToFloat(m_camera_offset, BS);
 333
 334                         for(u16 i=0; i<4; i++)
 335                                 v[i].Pos += pos;
 336                         u16 indices[] = {0,1,2,2,3,0};
 337                         driver->drawVertexPrimitiveList(v, 4, indices, 2,
 338                                         video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
 339                 }
 340         }
 341
 342         delete[] grid;
 343
 344         // Restore fog settings
 345         driver->setFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 346                         fog_pixelfog, fog_rangefog);
 347 }
 348
 349 void Clouds::step(float dtime)
 350 {
 351         m_origin = m_origin + dtime * BS * m_params.speed;
 352 }
 353
 354 void Clouds::update(v2f camera_p, video::SColorf color_diffuse)
 355 {
 356         m_camera_pos = camera_p;
 357         m_color.r = MYMIN(MYMAX(color_diffuse.r * m_params.color_bright.getRed(),
 358                         m_params.color_ambient.getRed()), 255) / 255.0f;
 359         m_color.g = MYMIN(MYMAX(color_diffuse.g * m_params.color_bright.getGreen(),
 360                         m_params.color_ambient.getGreen()), 255) / 255.0f;
 361         m_color.b = MYMIN(MYMAX(color_diffuse.b * m_params.color_bright.getBlue(),
 362                         m_params.color_ambient.getBlue()), 255) / 255.0f;
 363         m_color.a = m_params.color_bright.getAlpha() / 255.0f;
 364 }
 365
 366 void Clouds::readSettings()
 367 {
 368         m_params.height = (m_passed_cloud_y ? m_passed_cloud_y :
 369                 g_settings->getS16("cloud_height"));
 370         m_cloud_radius_i = g_settings->getU16("cloud_radius");
 371         m_enable_3d = g_settings->getBool("enable_3d_clouds");
 372 }