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 "main.h" // For g_profiler and g_settings
  25 #include "profiler.h"
  26 #include "settings.h"
  27
  28 Clouds::Clouds(
  29                 scene::ISceneNode* parent,
  30                 scene::ISceneManager* mgr,
  31                 s32 id,
  32                 u32 seed
  33 ):
  34         scene::ISceneNode(parent, mgr, id),
  35         m_seed(seed),
  36         m_camera_pos(0,0),
  37         m_time(0)
  38 {
  39         m_material.setFlag(video::EMF_LIGHTING, false);
  40         //m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
  41         m_material.setFlag(video::EMF_BACK_FACE_CULLING, true);
  42         m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
  43         m_material.setFlag(video::EMF_FOG_ENABLE, true);
  44         m_material.setFlag(video::EMF_ANTI_ALIASING, true);
  45         //m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  46         m_material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  47
  48         m_cloud_y = BS * g_settings->getS16("cloud_height");
  49
  50         m_box = core::aabbox3d<f32>(-BS*1000000,m_cloud_y-BS,-BS*1000000,
  51                         BS*1000000,m_cloud_y+BS,BS*1000000);
  52
  53 }
  54
  55 Clouds::~Clouds()
  56 {
  57 }
  58
  59 void Clouds::OnRegisterSceneNode()
  60 {
  61         if(IsVisible)
  62         {
  63                 SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
  64                 //SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
  65         }
  66
  67         ISceneNode::OnRegisterSceneNode();
  68 }
  69
  70 #define MYROUND(x) (x > 0.0 ? (int)x : (int)x - 1)
  71
  72 void Clouds::render()
  73 {
  74         video::IVideoDriver* driver = SceneManager->getVideoDriver();
  75
  76         if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
  77         //if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
  78                 return;
  79
  80         ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
  81
  82         bool enable_3d = g_settings->getBool("enable_3d_clouds");
  83         int num_faces_to_draw = enable_3d ? 6 : 1;
  84
  85         m_material.setFlag(video::EMF_BACK_FACE_CULLING, enable_3d);
  86
  87         driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
  88         driver->setMaterial(m_material);
  89
  90         /*
  91                 Clouds move from X+ towards X-
  92         */
  93
  94         const s16 cloud_radius_i = 12;
  95         const float cloud_size = BS*64;
  96         const v2f cloud_speed(0, -BS*2);
  97
  98         const float cloud_full_radius = cloud_size * cloud_radius_i;
  99
 100         // Position of cloud noise origin in world coordinates
 101         v2f world_cloud_origin_pos_f = m_time*cloud_speed;
 102         // Position of cloud noise origin from the camera
 103         v2f cloud_origin_from_camera_f = world_cloud_origin_pos_f - m_camera_pos;
 104         // The center point of drawing in the noise
 105         v2f center_of_drawing_in_noise_f = -cloud_origin_from_camera_f;
 106         // The integer center point of drawing in the noise
 107         v2s16 center_of_drawing_in_noise_i(
 108                 MYROUND(center_of_drawing_in_noise_f.X / cloud_size),
 109                 MYROUND(center_of_drawing_in_noise_f.Y / cloud_size)
 110         );
 111         // The world position of the integer center point of drawing in the noise
 112         v2f world_center_of_drawing_in_noise_f = v2f(
 113                 center_of_drawing_in_noise_i.X * cloud_size,
 114                 center_of_drawing_in_noise_i.Y * cloud_size
 115         ) + world_cloud_origin_pos_f;
 116
 117         /*video::SColor c_top(128,b*240,b*240,b*255);
 118         video::SColor c_side_1(128,b*230,b*230,b*255);
 119         video::SColor c_side_2(128,b*220,b*220,b*245);
 120         video::SColor c_bottom(128,b*205,b*205,b*230);*/
 121         video::SColorf c_top_f(m_color);
 122         video::SColorf c_side_1_f(m_color);
 123         video::SColorf c_side_2_f(m_color);
 124         video::SColorf c_bottom_f(m_color);
 125         c_side_1_f.r *= 0.95;
 126         c_side_1_f.g *= 0.95;
 127         c_side_1_f.b *= 0.95;
 128         c_side_2_f.r *= 0.90;
 129         c_side_2_f.g *= 0.90;
 130         c_side_2_f.b *= 0.90;
 131         c_bottom_f.r *= 0.80;
 132         c_bottom_f.g *= 0.80;
 133         c_bottom_f.b *= 0.80;
 134         c_top_f.a = 0.9;
 135         c_side_1_f.a = 0.9;
 136         c_side_2_f.a = 0.9;
 137         c_bottom_f.a = 0.9;
 138         video::SColor c_top = c_top_f.toSColor();
 139         video::SColor c_side_1 = c_side_1_f.toSColor();
 140         video::SColor c_side_2 = c_side_2_f.toSColor();
 141         video::SColor c_bottom = c_bottom_f.toSColor();
 142
 143         // Get fog parameters for setting them back later
 144         video::SColor fog_color(0,0,0,0);
 145         video::E_FOG_TYPE fog_type = video::EFT_FOG_LINEAR;
 146         f32 fog_start = 0;
 147         f32 fog_end = 0;
 148         f32 fog_density = 0;
 149         bool fog_pixelfog = false;
 150         bool fog_rangefog = false;
 151         driver->getFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 152                         fog_pixelfog, fog_rangefog);
 153
 154         // Set our own fog
 155         driver->setFog(fog_color, fog_type, cloud_full_radius * 0.5,
 156                         cloud_full_radius*1.2, fog_density, fog_pixelfog, fog_rangefog);
 157
 158         // Read noise
 159
 160         bool *grid = new bool[cloud_radius_i*2*cloud_radius_i*2];
 161
 162         for(s16 zi=-cloud_radius_i; zi<cloud_radius_i; zi++)
 163         for(s16 xi=-cloud_radius_i; xi<cloud_radius_i; xi++)
 164         {
 165                 u32 i = (zi+cloud_radius_i)*cloud_radius_i*2 + xi+cloud_radius_i;
 166
 167                 v2s16 p_in_noise_i(
 168                         xi+center_of_drawing_in_noise_i.X,
 169                         zi+center_of_drawing_in_noise_i.Y
 170                 );
 171
 172 #if 0
 173                 double noise = noise2d_perlin_abs(
 174                                 (float)p_in_noise_i.X*cloud_size/BS/200,
 175                                 (float)p_in_noise_i.Y*cloud_size/BS/200,
 176                                 m_seed, 3, 0.4);
 177                 grid[i] = (noise >= 0.80);
 178 #endif
 179 #if 1
 180                 double noise = noise2d_perlin(
 181                                 (float)p_in_noise_i.X*cloud_size/BS/200,
 182                                 (float)p_in_noise_i.Y*cloud_size/BS/200,
 183                                 m_seed, 3, 0.5);
 184                 grid[i] = (noise >= 0.4);
 185 #endif
 186         }
 187
 188 #define GETINDEX(x, z, radius) (((z)+(radius))*(radius)*2 + (x)+(radius))
 189 #define CONTAINS(x, z, radius) \
 190         ((x) >= -(radius) && (x) < (radius) && (z) >= -(radius) && (z) < (radius))
 191
 192         for(s16 zi0=-cloud_radius_i; zi0<cloud_radius_i; zi0++)
 193         for(s16 xi0=-cloud_radius_i; xi0<cloud_radius_i; xi0++)
 194         {
 195                 s16 zi = zi0;
 196                 s16 xi = xi0;
 197                 // Draw from front to back (needed for transparency)
 198                 /*if(zi <= 0)
 199                         zi = -cloud_radius_i - zi;
 200                 if(xi <= 0)
 201                         xi = -cloud_radius_i - xi;*/
 202                 // Draw from back to front
 203                 if(zi >= 0)
 204                         zi = cloud_radius_i - zi - 1;
 205                 if(xi >= 0)
 206                         xi = cloud_radius_i - xi - 1;
 207
 208                 u32 i = GETINDEX(xi, zi, cloud_radius_i);
 209
 210                 if(grid[i] == false)
 211                         continue;
 212
 213                 v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
 214
 215                 video::S3DVertex v[4] = {
 216                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 1),
 217                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 1),
 218                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 0),
 219                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 0)
 220                 };
 221
 222                 /*if(zi <= 0 && xi <= 0){
 223                         v[0].Color.setBlue(255);
 224                         v[1].Color.setBlue(255);
 225                         v[2].Color.setBlue(255);
 226                         v[3].Color.setBlue(255);
 227                 }*/
 228
 229                 f32 rx = cloud_size/2;
 230                 f32 ry = 8*BS;
 231                 f32 rz = cloud_size/2;
 232
 233                 for(int i=0; i<num_faces_to_draw; i++)
 234                 {
 235                         switch(i)
 236                         {
 237                         case 0: // top
 238                                 for(int j=0;j<4;j++){
 239                                         v[j].Normal.set(0,1,0);
 240                                 }
 241                                 v[0].Pos.set(-rx, ry,-rz);
 242                                 v[1].Pos.set(-rx, ry, rz);
 243                                 v[2].Pos.set( rx, ry, rz);
 244                                 v[3].Pos.set( rx, ry,-rz);
 245                                 break;
 246                         case 1: // back
 247                                 if(CONTAINS(xi, zi-1, cloud_radius_i)){
 248                                         u32 j = GETINDEX(xi, zi-1, cloud_radius_i);
 249                                         if(grid[j])
 250                                                 continue;
 251                                 }
 252                                 for(int j=0;j<4;j++){
 253                                         v[j].Color = c_side_1;
 254                                         v[j].Normal.set(0,0,-1);
 255                                 }
 256                                 v[0].Pos.set(-rx, ry,-rz);
 257                                 v[1].Pos.set( rx, ry,-rz);
 258                                 v[2].Pos.set( rx,-ry,-rz);
 259                                 v[3].Pos.set(-rx,-ry,-rz);
 260                                 break;
 261                         case 2: //right
 262                                 if(CONTAINS(xi+1, zi, cloud_radius_i)){
 263                                         u32 j = GETINDEX(xi+1, zi, cloud_radius_i);
 264                                         if(grid[j])
 265                                                 continue;
 266                                 }
 267                                 for(int j=0;j<4;j++){
 268                                         v[j].Color = c_side_2;
 269                                         v[j].Normal.set(1,0,0);
 270                                 }
 271                                 v[0].Pos.set( rx, ry,-rz);
 272                                 v[1].Pos.set( rx, ry, rz);
 273                                 v[2].Pos.set( rx,-ry, rz);
 274                                 v[3].Pos.set( rx,-ry,-rz);
 275                                 break;
 276                         case 3: // front
 277                                 if(CONTAINS(xi, zi+1, cloud_radius_i)){
 278                                         u32 j = GETINDEX(xi, zi+1, cloud_radius_i);
 279                                         if(grid[j])
 280                                                 continue;
 281                                 }
 282                                 for(int j=0;j<4;j++){
 283                                         v[j].Color = c_side_1;
 284                                         v[j].Normal.set(0,0,-1);
 285                                 }
 286                                 v[0].Pos.set( rx, ry, rz);
 287                                 v[1].Pos.set(-rx, ry, rz);
 288                                 v[2].Pos.set(-rx,-ry, rz);
 289                                 v[3].Pos.set( rx,-ry, rz);
 290                                 break;
 291                         case 4: // left
 292                                 if(CONTAINS(xi-1, zi, cloud_radius_i)){
 293                                         u32 j = GETINDEX(xi-1, zi, cloud_radius_i);
 294                                         if(grid[j])
 295                                                 continue;
 296                                 }
 297                                 for(int j=0;j<4;j++){
 298                                         v[j].Color = c_side_2;
 299                                         v[j].Normal.set(-1,0,0);
 300                                 }
 301                                 v[0].Pos.set(-rx, ry, rz);
 302                                 v[1].Pos.set(-rx, ry,-rz);
 303                                 v[2].Pos.set(-rx,-ry,-rz);
 304                                 v[3].Pos.set(-rx,-ry, rz);
 305                                 break;
 306                         case 5: // bottom
 307                                 for(int j=0;j<4;j++){
 308                                         v[j].Color = c_bottom;
 309                                         v[j].Normal.set(0,-1,0);
 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                         }
 317
 318                         v3f pos(p0.X, m_cloud_y, p0.Y);
 319
 320                         for(u16 i=0; i<4; i++)
 321                                 v[i].Pos += pos;
 322                         u16 indices[] = {0,1,2,2,3,0};
 323                         driver->drawVertexPrimitiveList(v, 4, indices, 2,
 324                                         video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
 325                 }
 326         }
 327
 328         delete[] grid;
 329
 330         // Restore fog settings
 331         driver->setFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 332                         fog_pixelfog, fog_rangefog);
 333 }
 334
 335 void Clouds::step(float dtime)
 336 {
 337         m_time += dtime;
 338 }
 339
 340 void Clouds::update(v2f camera_p, video::SColorf color)
 341 {
 342         m_camera_pos = camera_p;
 343         m_color = color;
 344         //m_brightness = brightness;
 345         //dstream<<"m_brightness="<<m_brightness<<std::endl;
 346 }
 347