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