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         ((Clouds *)data)->readSettings();
  36 }
  37
  38 Clouds::Clouds(
  39                 scene::ISceneNode* parent,
  40                 scene::ISceneManager* mgr,
  41                 s32 id,
  42                 u32 seed,
  43                 s16 cloudheight
  44 ):
  45         scene::ISceneNode(parent, mgr, id),
  46         m_seed(seed),
  47         m_camera_pos(0,0),
  48         m_time(0),
  49         m_camera_offset(0,0,0)
  50 {
  51         m_material.setFlag(video::EMF_LIGHTING, false);
  52         //m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
  53         m_material.setFlag(video::EMF_BACK_FACE_CULLING, true);
  54         m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
  55         m_material.setFlag(video::EMF_FOG_ENABLE, true);
  56         m_material.setFlag(video::EMF_ANTI_ALIASING, true);
  57         //m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  58         m_material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  59
  60         m_passed_cloud_y = cloudheight;
  61         readSettings();
  62         g_settings->registerChangedCallback("enable_3d_clouds",
  63                 &cloud_3d_setting_changed, this);
  64
  65         m_box = aabb3f(-BS*1000000,m_cloud_y-BS,-BS*1000000,
  66                         BS*1000000,m_cloud_y+BS,BS*1000000);
  67
  68 }
  69
  70 Clouds::~Clouds()
  71 {
  72         g_settings->deregisterChangedCallback("enable_3d_clouds",
  73                 &cloud_3d_setting_changed, this);
  74 }
  75
  76 void Clouds::OnRegisterSceneNode()
  77 {
  78         if(IsVisible)
  79         {
  80                 SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
  81                 //SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
  82         }
  83
  84         ISceneNode::OnRegisterSceneNode();
  85 }
  86
  87 #define MYROUND(x) (x > 0.0 ? (int)x : (int)x - 1)
  88
  89 void Clouds::render()
  90 {
  91         video::IVideoDriver* driver = SceneManager->getVideoDriver();
  92
  93         if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
  94         //if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
  95                 return;
  96
  97         ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
  98
  99         int num_faces_to_draw = m_enable_3d ? 6 : 1;
 100
 101         m_material.setFlag(video::EMF_BACK_FACE_CULLING, m_enable_3d);
 102
 103         driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
 104         driver->setMaterial(m_material);
 105
 106         /*
 107                 Clouds move from Z+ towards Z-
 108         */
 109
 110         const float cloud_size = BS * 64;
 111         const v2f cloud_speed(0, -BS * 2);
 112
 113         const float cloud_full_radius = cloud_size * m_cloud_radius_i;
 114
 115         // Position of cloud noise origin in world coordinates
 116         v2f world_cloud_origin_pos_f = m_time * cloud_speed;
 117         // Position of cloud noise origin from the camera
 118         v2f cloud_origin_from_camera_f = world_cloud_origin_pos_f - m_camera_pos;
 119         // The center point of drawing in the noise
 120         v2f center_of_drawing_in_noise_f = -cloud_origin_from_camera_f;
 121         // The integer center point of drawing in the noise
 122         v2s16 center_of_drawing_in_noise_i(
 123                 MYROUND(center_of_drawing_in_noise_f.X / cloud_size),
 124                 MYROUND(center_of_drawing_in_noise_f.Y / cloud_size)
 125         );
 126         // The world position of the integer center point of drawing in the noise
 127         v2f world_center_of_drawing_in_noise_f = v2f(
 128                 center_of_drawing_in_noise_i.X * cloud_size,
 129                 center_of_drawing_in_noise_i.Y * cloud_size
 130         ) + world_cloud_origin_pos_f;
 131
 132         /*video::SColor c_top(128,b*240,b*240,b*255);
 133         video::SColor c_side_1(128,b*230,b*230,b*255);
 134         video::SColor c_side_2(128,b*220,b*220,b*245);
 135         video::SColor c_bottom(128,b*205,b*205,b*230);*/
 136         video::SColorf c_top_f(m_color);
 137         video::SColorf c_side_1_f(m_color);
 138         video::SColorf c_side_2_f(m_color);
 139         video::SColorf c_bottom_f(m_color);
 140         c_side_1_f.r *= 0.95;
 141         c_side_1_f.g *= 0.95;
 142         c_side_1_f.b *= 0.95;
 143         c_side_2_f.r *= 0.90;
 144         c_side_2_f.g *= 0.90;
 145         c_side_2_f.b *= 0.90;
 146         c_bottom_f.r *= 0.80;
 147         c_bottom_f.g *= 0.80;
 148         c_bottom_f.b *= 0.80;
 149         c_top_f.a = 0.9;
 150         c_side_1_f.a = 0.9;
 151         c_side_2_f.a = 0.9;
 152         c_bottom_f.a = 0.9;
 153         video::SColor c_top = c_top_f.toSColor();
 154         video::SColor c_side_1 = c_side_1_f.toSColor();
 155         video::SColor c_side_2 = c_side_2_f.toSColor();
 156         video::SColor c_bottom = c_bottom_f.toSColor();
 157
 158         // Get fog parameters for setting them back later
 159         video::SColor fog_color(0,0,0,0);
 160         video::E_FOG_TYPE fog_type = video::EFT_FOG_LINEAR;
 161         f32 fog_start = 0;
 162         f32 fog_end = 0;
 163         f32 fog_density = 0;
 164         bool fog_pixelfog = false;
 165         bool fog_rangefog = false;
 166         driver->getFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 167                         fog_pixelfog, fog_rangefog);
 168
 169         // Set our own fog
 170         driver->setFog(fog_color, fog_type, cloud_full_radius * 0.5,
 171                         cloud_full_radius*1.2, fog_density, fog_pixelfog, fog_rangefog);
 172
 173         // Read noise
 174
 175         bool *grid = new bool[m_cloud_radius_i * 2 * m_cloud_radius_i * 2];
 176
 177         float cloud_size_noise = cloud_size / BS / 200;
 178
 179         for(s16 zi = -m_cloud_radius_i; zi < m_cloud_radius_i; zi++) {
 180                 u32 si = (zi + m_cloud_radius_i) * m_cloud_radius_i * 2 + m_cloud_radius_i;
 181
 182                 for (s16 xi = -m_cloud_radius_i; xi < m_cloud_radius_i; xi++) {
 183                         u32 i = si + xi;
 184
 185                         v2s16 p_in_noise_i(
 186                                 xi + center_of_drawing_in_noise_i.X,
 187                                 zi + center_of_drawing_in_noise_i.Y
 188                         );
 189
 190                         double noise = noise2d_perlin(
 191                                         (float)p_in_noise_i.X * cloud_size_noise,
 192                                         (float)p_in_noise_i.Y * cloud_size_noise,
 193                                         m_seed, 3, 0.5);
 194                         grid[i] = (noise >= 0.4);
 195                 }
 196         }
 197
 198 #define GETINDEX(x, z, radius) (((z)+(radius))*(radius)*2 + (x)+(radius))
 199 #define INAREA(x, z, radius) \
 200         ((x) >= -(radius) && (x) < (radius) && (z) >= -(radius) && (z) < (radius))
 201
 202         for (s16 zi0= -m_cloud_radius_i; zi0 < m_cloud_radius_i; zi0++)
 203         for (s16 xi0= -m_cloud_radius_i; xi0 < m_cloud_radius_i; xi0++)
 204         {
 205                 s16 zi = zi0;
 206                 s16 xi = xi0;
 207                 // Draw from front to back (needed for transparency)
 208                 /*if(zi <= 0)
 209                         zi = -m_cloud_radius_i - zi;
 210                 if(xi <= 0)
 211                         xi = -m_cloud_radius_i - xi;*/
 212                 // Draw from back to front
 213                 if(zi >= 0)
 214                         zi = m_cloud_radius_i - zi - 1;
 215                 if(xi >= 0)
 216                         xi = m_cloud_radius_i - xi - 1;
 217
 218                 u32 i = GETINDEX(xi, zi, m_cloud_radius_i);
 219
 220                 if(grid[i] == false)
 221                         continue;
 222
 223                 v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
 224
 225                 video::S3DVertex v[4] = {
 226                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 1),
 227                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 1),
 228                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 0),
 229                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 0)
 230                 };
 231
 232                 /*if(zi <= 0 && xi <= 0){
 233                         v[0].Color.setBlue(255);
 234                         v[1].Color.setBlue(255);
 235                         v[2].Color.setBlue(255);
 236                         v[3].Color.setBlue(255);
 237                 }*/
 238
 239                 f32 rx = cloud_size/2;
 240                 f32 ry = 8 * BS;
 241                 f32 rz = cloud_size / 2;
 242
 243                 for(int i=0; i<num_faces_to_draw; i++)
 244                 {
 245                         switch(i)
 246                         {
 247                         case 0: // top
 248                                 for(int j=0;j<4;j++){
 249                                         v[j].Normal.set(0,1,0);
 250                                 }
 251                                 v[0].Pos.set(-rx, ry,-rz);
 252                                 v[1].Pos.set(-rx, ry, rz);
 253                                 v[2].Pos.set( rx, ry, rz);
 254                                 v[3].Pos.set( rx, ry,-rz);
 255                                 break;
 256                         case 1: // back
 257                                 if (INAREA(xi, zi - 1, m_cloud_radius_i)) {
 258                                         u32 j = GETINDEX(xi, zi - 1, m_cloud_radius_i);
 259                                         if(grid[j])
 260                                                 continue;
 261                                 }
 262                                 for(int j=0;j<4;j++){
 263                                         v[j].Color = c_side_1;
 264                                         v[j].Normal.set(0,0,-1);
 265                                 }
 266                                 v[0].Pos.set(-rx, ry,-rz);
 267                                 v[1].Pos.set( rx, ry,-rz);
 268                                 v[2].Pos.set( rx,-ry,-rz);
 269                                 v[3].Pos.set(-rx,-ry,-rz);
 270                                 break;
 271                         case 2: //right
 272                                 if (INAREA(xi + 1, zi, m_cloud_radius_i)) {
 273                                         u32 j = GETINDEX(xi+1, zi, m_cloud_radius_i);
 274                                         if(grid[j])
 275                                                 continue;
 276                                 }
 277                                 for(int j=0;j<4;j++){
 278                                         v[j].Color = c_side_2;
 279                                         v[j].Normal.set(1,0,0);
 280                                 }
 281                                 v[0].Pos.set( rx, ry,-rz);
 282                                 v[1].Pos.set( rx, ry, rz);
 283                                 v[2].Pos.set( rx,-ry, rz);
 284                                 v[3].Pos.set( rx,-ry,-rz);
 285                                 break;
 286                         case 3: // front
 287                                 if (INAREA(xi, zi + 1, m_cloud_radius_i)) {
 288                                         u32 j = GETINDEX(xi, zi + 1, m_cloud_radius_i);
 289                                         if(grid[j])
 290                                                 continue;
 291                                 }
 292                                 for(int j=0;j<4;j++){
 293                                         v[j].Color = c_side_1;
 294                                         v[j].Normal.set(0,0,-1);
 295                                 }
 296                                 v[0].Pos.set( rx, ry, rz);
 297                                 v[1].Pos.set(-rx, ry, rz);
 298                                 v[2].Pos.set(-rx,-ry, rz);
 299                                 v[3].Pos.set( rx,-ry, rz);
 300                                 break;
 301                         case 4: // left
 302                                 if (INAREA(xi-1, zi, m_cloud_radius_i)) {
 303                                         u32 j = GETINDEX(xi-1, zi, m_cloud_radius_i);
 304                                         if(grid[j])
 305                                                 continue;
 306                                 }
 307                                 for(int j=0;j<4;j++){
 308                                         v[j].Color = c_side_2;
 309                                         v[j].Normal.set(-1,0,0);
 310                                 }
 311                                 v[0].Pos.set(-rx, ry, rz);
 312                                 v[1].Pos.set(-rx, ry,-rz);
 313                                 v[2].Pos.set(-rx,-ry,-rz);
 314                                 v[3].Pos.set(-rx,-ry, rz);
 315                                 break;
 316                         case 5: // bottom
 317                                 for(int j=0;j<4;j++){
 318                                         v[j].Color = c_bottom;
 319                                         v[j].Normal.set(0,-1,0);
 320                                 }
 321                                 v[0].Pos.set( rx,-ry, rz);
 322                                 v[1].Pos.set(-rx,-ry, rz);
 323                                 v[2].Pos.set(-rx,-ry,-rz);
 324                                 v[3].Pos.set( rx,-ry,-rz);
 325                                 break;
 326                         }
 327
 328                         v3f pos(p0.X, m_cloud_y, p0.Y);
 329                         pos -= intToFloat(m_camera_offset, BS);
 330
 331                         for(u16 i=0; i<4; i++)
 332                                 v[i].Pos += pos;
 333                         u16 indices[] = {0,1,2,2,3,0};
 334                         driver->drawVertexPrimitiveList(v, 4, indices, 2,
 335                                         video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
 336                 }
 337         }
 338
 339         delete[] grid;
 340
 341         // Restore fog settings
 342         driver->setFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 343                         fog_pixelfog, fog_rangefog);
 344 }
 345
 346 void Clouds::step(float dtime)
 347 {
 348         m_time += dtime;
 349 }
 350
 351 void Clouds::update(v2f camera_p, video::SColorf color)
 352 {
 353         m_camera_pos = camera_p;
 354         m_color = color;
 355         //m_brightness = brightness;
 356         //dstream<<"m_brightness="<<m_brightness<<std::endl;
 357 }
 358
 359 void Clouds::readSettings()
 360 {
 361         m_cloud_y = BS * (m_passed_cloud_y ? m_passed_cloud_y :
 362                 g_settings->getS16("cloud_height"));
 363         m_cloud_radius_i = g_settings->getU16("cloud_radius");
 364         m_enable_3d = g_settings->getBool("enable_3d_clouds");
 365 }
 366