src/clouds.cpp

   1 /*
   2 Minetest-c55
   3 Copyright (C) 2010-2011 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 General Public License as published by
   7 the Free Software Foundation; either version 2 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 General Public License for more details.
  14
  15 You should have received a copy of the GNU 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*100;
  49         //m_cloud_y = BS*50;
  50
  51         m_box = core::aabbox3d<f32>(-BS*1000000,m_cloud_y-BS,-BS*1000000,
  52                         BS*1000000,m_cloud_y+BS,BS*1000000);
  53
  54 }
  55
  56 Clouds::~Clouds()
  57 {
  58 }
  59
  60 void Clouds::OnRegisterSceneNode()
  61 {
  62         if(IsVisible)
  63         {
  64                 SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
  65                 //SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
  66         }
  67
  68         ISceneNode::OnRegisterSceneNode();
  69 }
  70
  71 #define MYROUND(x) (x > 0.0 ? (int)x : (int)x - 1)
  72
  73 void Clouds::render()
  74 {
  75         video::IVideoDriver* driver = SceneManager->getVideoDriver();
  76
  77         if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
  78         //if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
  79                 return;
  80
  81         ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
  82
  83         bool enable_3d = g_settings->getBool("enable_3d_clouds");
  84         int num_faces_to_draw = enable_3d ? 6 : 1;
  85
  86         m_material.setFlag(video::EMF_BACK_FACE_CULLING, enable_3d);
  87
  88         driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
  89         driver->setMaterial(m_material);
  90
  91         /*
  92                 Clouds move from X+ towards X-
  93         */
  94
  95         const s16 cloud_radius_i = 12;
  96         const float cloud_size = BS*64;
  97         const v2f cloud_speed(0, -BS*2);
  98
  99         const float cloud_full_radius = cloud_size * cloud_radius_i;
 100
 101         // Position of cloud noise origin in world coordinates
 102         v2f world_cloud_origin_pos_f = m_time*cloud_speed;
 103         // Position of cloud noise origin from the camera
 104         v2f cloud_origin_from_camera_f = world_cloud_origin_pos_f - m_camera_pos;
 105         // The center point of drawing in the noise
 106         v2f center_of_drawing_in_noise_f = -cloud_origin_from_camera_f;
 107         // The integer center point of drawing in the noise
 108         v2s16 center_of_drawing_in_noise_i(
 109                 MYROUND(center_of_drawing_in_noise_f.X / cloud_size),
 110                 MYROUND(center_of_drawing_in_noise_f.Y / cloud_size)
 111         );
 112         // The world position of the integer center point of drawing in the noise
 113         v2f world_center_of_drawing_in_noise_f = v2f(
 114                 center_of_drawing_in_noise_i.X * cloud_size,
 115                 center_of_drawing_in_noise_i.Y * cloud_size
 116         ) + world_cloud_origin_pos_f;
 117
 118         /*video::SColor c_top(128,b*240,b*240,b*255);
 119         video::SColor c_side_1(128,b*230,b*230,b*255);
 120         video::SColor c_side_2(128,b*220,b*220,b*245);
 121         video::SColor c_bottom(128,b*205,b*205,b*230);*/
 122         video::SColorf c_top_f(m_color);
 123         video::SColorf c_side_1_f(m_color);
 124         video::SColorf c_side_2_f(m_color);
 125         video::SColorf c_bottom_f(m_color);
 126         c_side_1_f.r *= 0.95;
 127         c_side_1_f.g *= 0.95;
 128         c_side_1_f.b *= 0.95;
 129         c_side_2_f.r *= 0.90;
 130         c_side_2_f.g *= 0.90;
 131         c_side_2_f.b *= 0.90;
 132         c_bottom_f.r *= 0.80;
 133         c_bottom_f.g *= 0.80;
 134         c_bottom_f.b *= 0.80;
 135         c_top_f.a = 0.9;
 136         c_side_1_f.a = 0.9;
 137         c_side_2_f.a = 0.9;
 138         c_bottom_f.a = 0.9;
 139         video::SColor c_top = c_top_f.toSColor();
 140         video::SColor c_side_1 = c_side_1_f.toSColor();
 141         video::SColor c_side_2 = c_side_2_f.toSColor();
 142         video::SColor c_bottom = c_bottom_f.toSColor();
 143
 144         // Get fog parameters for setting them back later
 145         video::SColor fog_color(0,0,0,0);
 146         video::E_FOG_TYPE fog_type = video::EFT_FOG_LINEAR;
 147         f32 fog_start = 0;
 148         f32 fog_end = 0;
 149         f32 fog_density = 0;
 150         bool fog_pixelfog = false;
 151         bool fog_rangefog = false;
 152         driver->getFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 153                         fog_pixelfog, fog_rangefog);
 154
 155         // Set our own fog
 156         driver->setFog(fog_color, fog_type, cloud_full_radius * 0.5,
 157                         cloud_full_radius*1.2, fog_density, fog_pixelfog, fog_rangefog);
 158
 159         // Read noise
 160
 161         bool *grid = new bool[cloud_radius_i*2*cloud_radius_i*2];
 162
 163         for(s16 zi=-cloud_radius_i; zi<cloud_radius_i; zi++)
 164         for(s16 xi=-cloud_radius_i; xi<cloud_radius_i; xi++)
 165         {
 166                 u32 i = (zi+cloud_radius_i)*cloud_radius_i*2 + xi+cloud_radius_i;
 167
 168                 v2s16 p_in_noise_i(
 169                         xi+center_of_drawing_in_noise_i.X,
 170                         zi+center_of_drawing_in_noise_i.Y
 171                 );
 172
 173 #if 0
 174                 double noise = noise2d_perlin_abs(
 175                                 (float)p_in_noise_i.X*cloud_size/BS/200,
 176                                 (float)p_in_noise_i.Y*cloud_size/BS/200,
 177                                 m_seed, 3, 0.4);
 178                 grid[i] = (noise >= 0.80);
 179 #endif
 180 #if 1
 181                 double noise = noise2d_perlin(
 182                                 (float)p_in_noise_i.X*cloud_size/BS/200,
 183                                 (float)p_in_noise_i.Y*cloud_size/BS/200,
 184                                 m_seed, 3, 0.5);
 185                 grid[i] = (noise >= 0.4);
 186 #endif
 187         }
 188
 189 #define GETINDEX(x, z, radius) (((z)+(radius))*(radius)*2 + (x)+(radius))
 190 #define CONTAINS(x, z, radius) \
 191         ((x) >= -(radius) && (x) < (radius) && (z) >= -(radius) && (z) < (radius))
 192
 193         for(s16 zi0=-cloud_radius_i; zi0<cloud_radius_i; zi0++)
 194         for(s16 xi0=-cloud_radius_i; xi0<cloud_radius_i; xi0++)
 195         {
 196                 s16 zi = zi0;
 197                 s16 xi = xi0;
 198                 // Draw from front to back (needed for transparency)
 199                 /*if(zi <= 0)
 200                         zi = -cloud_radius_i - zi;
 201                 if(xi <= 0)
 202                         xi = -cloud_radius_i - xi;*/
 203                 // Draw from back to front
 204                 if(zi >= 0)
 205                         zi = cloud_radius_i - zi - 1;
 206                 if(xi >= 0)
 207                         xi = cloud_radius_i - xi - 1;
 208
 209                 u32 i = GETINDEX(xi, zi, cloud_radius_i);
 210
 211                 if(grid[i] == false)
 212                         continue;
 213
 214                 v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
 215
 216                 video::S3DVertex v[4] =
 217                 {
 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 = v3f(0,1,0);
 242                                         }
 243                                         v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 244                                         v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 245                                         v[2].Pos.X= rx; v[2].Pos.Y= ry; v[2].Pos.Z= rz;
 246                                         v[3].Pos.X= rx; v[3].Pos.Y= ry, v[3].Pos.Z=-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 = v3f(0,0,-1);
 257                                         }
 258                                         v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 259                                         v[1].Pos.X= rx; v[1].Pos.Y= ry; v[1].Pos.Z=-rz;
 260                                         v[2].Pos.X= rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 261                                         v[3].Pos.X=-rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-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 = v3f(1,0,0);
 272                                         }
 273                                         v[0].Pos.X= rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 274                                         v[1].Pos.X= rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 275                                         v[2].Pos.X= rx; v[2].Pos.Y=-ry; v[2].Pos.Z= rz;
 276                                         v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-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 = v3f(0,0,-1);
 287                                         }
 288                                         v[0].Pos.X= rx; v[0].Pos.Y= ry; v[0].Pos.Z= rz;
 289                                         v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 290                                         v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z= rz;
 291                                         v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z= 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 = v3f(-1,0,0);
 302                                         }
 303                                         v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z= rz;
 304                                         v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z=-rz;
 305                                         v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 306                                         v[3].Pos.X=-rx; v[3].Pos.Y=-ry, v[3].Pos.Z= 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 = v3f(0,-1,0);
 312                                         }
 313                                         v[0].Pos.X= rx; v[0].Pos.Y=-ry; v[0].Pos.Z= rz;
 314                                         v[1].Pos.X=-rx; v[1].Pos.Y=-ry; v[1].Pos.Z= rz;
 315                                         v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 316                                         v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
 317                                         break;
 318                         }
 319
 320                         v3f pos = v3f(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