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                 s16 cloudheight
  34 ):
  35         scene::ISceneNode(parent, mgr, id),
  36         m_seed(seed),
  37         m_camera_pos(0,0),
  38         m_time(0)
  39 {
  40         m_material.setFlag(video::EMF_LIGHTING, false);
  41         //m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
  42         m_material.setFlag(video::EMF_BACK_FACE_CULLING, true);
  43         m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
  44         m_material.setFlag(video::EMF_FOG_ENABLE, true);
  45         m_material.setFlag(video::EMF_ANTI_ALIASING, true);
  46         //m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  47         m_material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  48
  49         m_cloud_y = BS * (cloudheight ? cloudheight :
  50                                 g_settings->getS16("cloud_height"));
  51
  52         m_box = core::aabbox3d<f32>(-BS*1000000,m_cloud_y-BS,-BS*1000000,
  53                         BS*1000000,m_cloud_y+BS,BS*1000000);
  54
  55 }
  56
  57 Clouds::~Clouds()
  58 {
  59 }
  60
  61 void Clouds::OnRegisterSceneNode()
  62 {
  63         if(IsVisible)
  64         {
  65                 SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
  66                 //SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
  67         }
  68
  69         ISceneNode::OnRegisterSceneNode();
  70 }
  71
  72 #define MYROUND(x) (x > 0.0 ? (int)x : (int)x - 1)
  73
  74 void Clouds::render()
  75 {
  76         video::IVideoDriver* driver = SceneManager->getVideoDriver();
  77
  78         if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
  79         //if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
  80                 return;
  81
  82         ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
  83
  84         bool enable_3d = g_settings->getBool("enable_3d_clouds");
  85         int num_faces_to_draw = enable_3d ? 6 : 1;
  86
  87         m_material.setFlag(video::EMF_BACK_FACE_CULLING, enable_3d);
  88
  89         driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
  90         driver->setMaterial(m_material);
  91
  92         /*
  93                 Clouds move from X+ towards X-
  94         */
  95
  96         const s16 cloud_radius_i = 12;
  97         const float cloud_size = BS*64;
  98         const v2f cloud_speed(0, -BS*2);
  99
 100         const float cloud_full_radius = cloud_size * cloud_radius_i;
 101
 102         // Position of cloud noise origin in world coordinates
 103         v2f world_cloud_origin_pos_f = m_time*cloud_speed;
 104         // Position of cloud noise origin from the camera
 105         v2f cloud_origin_from_camera_f = world_cloud_origin_pos_f - m_camera_pos;
 106         // The center point of drawing in the noise
 107         v2f center_of_drawing_in_noise_f = -cloud_origin_from_camera_f;
 108         // The integer center point of drawing in the noise
 109         v2s16 center_of_drawing_in_noise_i(
 110                 MYROUND(center_of_drawing_in_noise_f.X / cloud_size),
 111                 MYROUND(center_of_drawing_in_noise_f.Y / cloud_size)
 112         );
 113         // The world position of the integer center point of drawing in the noise
 114         v2f world_center_of_drawing_in_noise_f = v2f(
 115                 center_of_drawing_in_noise_i.X * cloud_size,
 116                 center_of_drawing_in_noise_i.Y * cloud_size
 117         ) + world_cloud_origin_pos_f;
 118
 119         /*video::SColor c_top(128,b*240,b*240,b*255);
 120         video::SColor c_side_1(128,b*230,b*230,b*255);
 121         video::SColor c_side_2(128,b*220,b*220,b*245);
 122         video::SColor c_bottom(128,b*205,b*205,b*230);*/
 123         video::SColorf c_top_f(m_color);
 124         video::SColorf c_side_1_f(m_color);
 125         video::SColorf c_side_2_f(m_color);
 126         video::SColorf c_bottom_f(m_color);
 127         c_side_1_f.r *= 0.95;
 128         c_side_1_f.g *= 0.95;
 129         c_side_1_f.b *= 0.95;
 130         c_side_2_f.r *= 0.90;
 131         c_side_2_f.g *= 0.90;
 132         c_side_2_f.b *= 0.90;
 133         c_bottom_f.r *= 0.80;
 134         c_bottom_f.g *= 0.80;
 135         c_bottom_f.b *= 0.80;
 136         c_top_f.a = 0.9;
 137         c_side_1_f.a = 0.9;
 138         c_side_2_f.a = 0.9;
 139         c_bottom_f.a = 0.9;
 140         video::SColor c_top = c_top_f.toSColor();
 141         video::SColor c_side_1 = c_side_1_f.toSColor();
 142         video::SColor c_side_2 = c_side_2_f.toSColor();
 143         video::SColor c_bottom = c_bottom_f.toSColor();
 144
 145         // Get fog parameters for setting them back later
 146         video::SColor fog_color(0,0,0,0);
 147         video::E_FOG_TYPE fog_type = video::EFT_FOG_LINEAR;
 148         f32 fog_start = 0;
 149         f32 fog_end = 0;
 150         f32 fog_density = 0;
 151         bool fog_pixelfog = false;
 152         bool fog_rangefog = false;
 153         driver->getFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 154                         fog_pixelfog, fog_rangefog);
 155
 156         // Set our own fog
 157         driver->setFog(fog_color, fog_type, cloud_full_radius * 0.5,
 158                         cloud_full_radius*1.2, fog_density, fog_pixelfog, fog_rangefog);
 159
 160         // Read noise
 161
 162         bool *grid = new bool[cloud_radius_i*2*cloud_radius_i*2];
 163
 164         for(s16 zi=-cloud_radius_i; zi<cloud_radius_i; zi++)
 165         for(s16 xi=-cloud_radius_i; xi<cloud_radius_i; xi++)
 166         {
 167                 u32 i = (zi+cloud_radius_i)*cloud_radius_i*2 + xi+cloud_radius_i;
 168
 169                 v2s16 p_in_noise_i(
 170                         xi+center_of_drawing_in_noise_i.X,
 171                         zi+center_of_drawing_in_noise_i.Y
 172                 );
 173
 174 #if 0
 175                 double noise = noise2d_perlin_abs(
 176                                 (float)p_in_noise_i.X*cloud_size/BS/200,
 177                                 (float)p_in_noise_i.Y*cloud_size/BS/200,
 178                                 m_seed, 3, 0.4);
 179                 grid[i] = (noise >= 0.80);
 180 #endif
 181 #if 1
 182                 double noise = noise2d_perlin(
 183                                 (float)p_in_noise_i.X*cloud_size/BS/200,
 184                                 (float)p_in_noise_i.Y*cloud_size/BS/200,
 185                                 m_seed, 3, 0.5);
 186                 grid[i] = (noise >= 0.4);
 187 #endif
 188         }
 189
 190 #define GETINDEX(x, z, radius) (((z)+(radius))*(radius)*2 + (x)+(radius))
 191 #define CONTAINS(x, z, radius) \
 192         ((x) >= -(radius) && (x) < (radius) && (z) >= -(radius) && (z) < (radius))
 193
 194         for(s16 zi0=-cloud_radius_i; zi0<cloud_radius_i; zi0++)
 195         for(s16 xi0=-cloud_radius_i; xi0<cloud_radius_i; xi0++)
 196         {
 197                 s16 zi = zi0;
 198                 s16 xi = xi0;
 199                 // Draw from front to back (needed for transparency)
 200                 /*if(zi <= 0)
 201                         zi = -cloud_radius_i - zi;
 202                 if(xi <= 0)
 203                         xi = -cloud_radius_i - xi;*/
 204                 // Draw from back to front
 205                 if(zi >= 0)
 206                         zi = cloud_radius_i - zi - 1;
 207                 if(xi >= 0)
 208                         xi = cloud_radius_i - xi - 1;
 209
 210                 u32 i = GETINDEX(xi, zi, cloud_radius_i);
 211
 212                 if(grid[i] == false)
 213                         continue;
 214
 215                 v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
 216
 217                 video::S3DVertex v[4] = {
 218                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 1),
 219                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 1),
 220                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 0),
 221                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 0)
 222                 };
 223
 224                 /*if(zi <= 0 && xi <= 0){
 225                         v[0].Color.setBlue(255);
 226                         v[1].Color.setBlue(255);
 227                         v[2].Color.setBlue(255);
 228                         v[3].Color.setBlue(255);
 229                 }*/
 230
 231                 f32 rx = cloud_size/2;
 232                 f32 ry = 8*BS;
 233                 f32 rz = cloud_size/2;
 234
 235                 for(int i=0; i<num_faces_to_draw; i++)
 236                 {
 237                         switch(i)
 238                         {
 239                         case 0: // top
 240                                 for(int j=0;j<4;j++){
 241                                         v[j].Normal.set(0,1,0);
 242                                 }
 243                                 v[0].Pos.set(-rx, ry,-rz);
 244                                 v[1].Pos.set(-rx, ry, rz);
 245                                 v[2].Pos.set( rx, ry, rz);
 246                                 v[3].Pos.set( rx, ry,-rz);
 247                                 break;
 248                         case 1: // back
 249                                 if(CONTAINS(xi, zi-1, cloud_radius_i)){
 250                                         u32 j = GETINDEX(xi, zi-1, cloud_radius_i);
 251                                         if(grid[j])
 252                                                 continue;
 253                                 }
 254                                 for(int j=0;j<4;j++){
 255                                         v[j].Color = c_side_1;
 256                                         v[j].Normal.set(0,0,-1);
 257                                 }
 258                                 v[0].Pos.set(-rx, ry,-rz);
 259                                 v[1].Pos.set( rx, ry,-rz);
 260                                 v[2].Pos.set( rx,-ry,-rz);
 261                                 v[3].Pos.set(-rx,-ry,-rz);
 262                                 break;
 263                         case 2: //right
 264                                 if(CONTAINS(xi+1, zi, cloud_radius_i)){
 265                                         u32 j = GETINDEX(xi+1, zi, cloud_radius_i);
 266                                         if(grid[j])
 267                                                 continue;
 268                                 }
 269                                 for(int j=0;j<4;j++){
 270                                         v[j].Color = c_side_2;
 271                                         v[j].Normal.set(1,0,0);
 272                                 }
 273                                 v[0].Pos.set( rx, ry,-rz);
 274                                 v[1].Pos.set( rx, ry, rz);
 275                                 v[2].Pos.set( rx,-ry, rz);
 276                                 v[3].Pos.set( rx,-ry,-rz);
 277                                 break;
 278                         case 3: // front
 279                                 if(CONTAINS(xi, zi+1, cloud_radius_i)){
 280                                         u32 j = GETINDEX(xi, zi+1, cloud_radius_i);
 281                                         if(grid[j])
 282                                                 continue;
 283                                 }
 284                                 for(int j=0;j<4;j++){
 285                                         v[j].Color = c_side_1;
 286                                         v[j].Normal.set(0,0,-1);
 287                                 }
 288                                 v[0].Pos.set( rx, ry, rz);
 289                                 v[1].Pos.set(-rx, ry, rz);
 290                                 v[2].Pos.set(-rx,-ry, rz);
 291                                 v[3].Pos.set( rx,-ry, rz);
 292                                 break;
 293                         case 4: // left
 294                                 if(CONTAINS(xi-1, zi, cloud_radius_i)){
 295                                         u32 j = GETINDEX(xi-1, zi, cloud_radius_i);
 296                                         if(grid[j])
 297                                                 continue;
 298                                 }
 299                                 for(int j=0;j<4;j++){
 300                                         v[j].Color = c_side_2;
 301                                         v[j].Normal.set(-1,0,0);
 302                                 }
 303                                 v[0].Pos.set(-rx, ry, rz);
 304                                 v[1].Pos.set(-rx, ry,-rz);
 305                                 v[2].Pos.set(-rx,-ry,-rz);
 306                                 v[3].Pos.set(-rx,-ry, rz);
 307                                 break;
 308                         case 5: // bottom
 309                                 for(int j=0;j<4;j++){
 310                                         v[j].Color = c_bottom;
 311                                         v[j].Normal.set(0,-1,0);
 312                                 }
 313                                 v[0].Pos.set( rx,-ry, rz);
 314                                 v[1].Pos.set(-rx,-ry, rz);
 315                                 v[2].Pos.set(-rx,-ry,-rz);
 316                                 v[3].Pos.set( rx,-ry,-rz);
 317                                 break;
 318                         }
 319
 320                         v3f pos(p0.X, m_cloud_y, p0.Y);
 321
 322                         for(u16 i=0; i<4; i++)
 323                                 v[i].Pos += pos;
 324                         u16 indices[] = {0,1,2,2,3,0};
 325                         driver->drawVertexPrimitiveList(v, 4, indices, 2,
 326                                         video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
 327                 }
 328         }
 329
 330         delete[] grid;
 331
 332         // Restore fog settings
 333         driver->setFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 334                         fog_pixelfog, fog_rangefog);
 335 }
 336
 337 void Clouds::step(float dtime)
 338 {
 339         m_time += dtime;
 340 }
 341
 342 void Clouds::update(v2f camera_p, video::SColorf color)
 343 {
 344         m_camera_pos = camera_p;
 345         m_color = color;
 346         //m_brightness = brightness;
 347         //dstream<<"m_brightness="<<m_brightness<<std::endl;
 348 }
 349