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 Clouds::Clouds(
  34                 scene::ISceneNode* parent,
  35                 scene::ISceneManager* mgr,
  36                 s32 id,
  37                 u32 seed,
  38                 s16 cloudheight
  39 ):
  40         scene::ISceneNode(parent, mgr, id),
  41         m_seed(seed),
  42         m_camera_pos(0,0),
  43         m_time(0),
  44         m_camera_offset(0,0,0)
  45 {
  46         m_material.setFlag(video::EMF_LIGHTING, false);
  47         //m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
  48         m_material.setFlag(video::EMF_BACK_FACE_CULLING, true);
  49         m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
  50         m_material.setFlag(video::EMF_FOG_ENABLE, true);
  51         m_material.setFlag(video::EMF_ANTI_ALIASING, true);
  52         //m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  53         m_material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
  54
  55         m_cloud_y = BS * (cloudheight ? cloudheight :
  56                                 g_settings->getS16("cloud_height"));
  57
  58         m_cloud_radius_i = g_settings->getU16("cloud_radius");
  59
  60         m_box = core::aabbox3d<f32>(-BS*1000000,m_cloud_y-BS,-BS*1000000,
  61                         BS*1000000,m_cloud_y+BS,BS*1000000);
  62
  63 }
  64
  65 Clouds::~Clouds()
  66 {
  67 }
  68
  69 void Clouds::OnRegisterSceneNode()
  70 {
  71         if(IsVisible)
  72         {
  73                 SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
  74                 //SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
  75         }
  76
  77         ISceneNode::OnRegisterSceneNode();
  78 }
  79
  80 #define MYROUND(x) (x > 0.0 ? (int)x : (int)x - 1)
  81
  82 void Clouds::render()
  83 {
  84         video::IVideoDriver* driver = SceneManager->getVideoDriver();
  85
  86         if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
  87         //if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
  88                 return;
  89
  90         ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
  91
  92         bool enable_3d = g_settings->getBool("enable_3d_clouds");
  93         int num_faces_to_draw = enable_3d ? 6 : 1;
  94
  95         m_material.setFlag(video::EMF_BACK_FACE_CULLING, enable_3d);
  96
  97         driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
  98         driver->setMaterial(m_material);
  99
 100         /*
 101                 Clouds move from Z+ towards Z-
 102         */
 103
 104         const float cloud_size = BS * 64;
 105         const v2f cloud_speed(0, -BS * 2);
 106
 107         const float cloud_full_radius = cloud_size * m_cloud_radius_i;
 108
 109         // Position of cloud noise origin in world coordinates
 110         v2f world_cloud_origin_pos_f = m_time * cloud_speed;
 111         // Position of cloud noise origin from the camera
 112         v2f cloud_origin_from_camera_f = world_cloud_origin_pos_f - m_camera_pos;
 113         // The center point of drawing in the noise
 114         v2f center_of_drawing_in_noise_f = -cloud_origin_from_camera_f;
 115         // The integer center point of drawing in the noise
 116         v2s16 center_of_drawing_in_noise_i(
 117                 MYROUND(center_of_drawing_in_noise_f.X / cloud_size),
 118                 MYROUND(center_of_drawing_in_noise_f.Y / cloud_size)
 119         );
 120         // The world position of the integer center point of drawing in the noise
 121         v2f world_center_of_drawing_in_noise_f = v2f(
 122                 center_of_drawing_in_noise_i.X * cloud_size,
 123                 center_of_drawing_in_noise_i.Y * cloud_size
 124         ) + world_cloud_origin_pos_f;
 125
 126         /*video::SColor c_top(128,b*240,b*240,b*255);
 127         video::SColor c_side_1(128,b*230,b*230,b*255);
 128         video::SColor c_side_2(128,b*220,b*220,b*245);
 129         video::SColor c_bottom(128,b*205,b*205,b*230);*/
 130         video::SColorf c_top_f(m_color);
 131         video::SColorf c_side_1_f(m_color);
 132         video::SColorf c_side_2_f(m_color);
 133         video::SColorf c_bottom_f(m_color);
 134         c_side_1_f.r *= 0.95;
 135         c_side_1_f.g *= 0.95;
 136         c_side_1_f.b *= 0.95;
 137         c_side_2_f.r *= 0.90;
 138         c_side_2_f.g *= 0.90;
 139         c_side_2_f.b *= 0.90;
 140         c_bottom_f.r *= 0.80;
 141         c_bottom_f.g *= 0.80;
 142         c_bottom_f.b *= 0.80;
 143         c_top_f.a = 0.9;
 144         c_side_1_f.a = 0.9;
 145         c_side_2_f.a = 0.9;
 146         c_bottom_f.a = 0.9;
 147         video::SColor c_top = c_top_f.toSColor();
 148         video::SColor c_side_1 = c_side_1_f.toSColor();
 149         video::SColor c_side_2 = c_side_2_f.toSColor();
 150         video::SColor c_bottom = c_bottom_f.toSColor();
 151
 152         // Get fog parameters for setting them back later
 153         video::SColor fog_color(0,0,0,0);
 154         video::E_FOG_TYPE fog_type = video::EFT_FOG_LINEAR;
 155         f32 fog_start = 0;
 156         f32 fog_end = 0;
 157         f32 fog_density = 0;
 158         bool fog_pixelfog = false;
 159         bool fog_rangefog = false;
 160         driver->getFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 161                         fog_pixelfog, fog_rangefog);
 162
 163         // Set our own fog
 164         driver->setFog(fog_color, fog_type, cloud_full_radius * 0.5,
 165                         cloud_full_radius*1.2, fog_density, fog_pixelfog, fog_rangefog);
 166
 167         // Read noise
 168
 169         bool *grid = new bool[m_cloud_radius_i * 2 * m_cloud_radius_i * 2];
 170
 171         float cloud_size_noise = cloud_size / BS / 200;
 172
 173         for(s16 zi = -m_cloud_radius_i; zi < m_cloud_radius_i; zi++) {
 174                 u32 si = (zi + m_cloud_radius_i) * m_cloud_radius_i * 2 + m_cloud_radius_i;
 175
 176                 for (s16 xi = -m_cloud_radius_i; xi < m_cloud_radius_i; xi++) {
 177                         u32 i = si + xi;
 178
 179                         v2s16 p_in_noise_i(
 180                                 xi + center_of_drawing_in_noise_i.X,
 181                                 zi + center_of_drawing_in_noise_i.Y
 182                         );
 183
 184                         double noise = noise2d_perlin(
 185                                         (float)p_in_noise_i.X * cloud_size_noise,
 186                                         (float)p_in_noise_i.Y * cloud_size_noise,
 187                                         m_seed, 3, 0.5);
 188                         grid[i] = (noise >= 0.4);
 189                 }
 190         }
 191
 192 #define GETINDEX(x, z, radius) (((z)+(radius))*(radius)*2 + (x)+(radius))
 193 #define INAREA(x, z, radius) \
 194         ((x) >= -(radius) && (x) < (radius) && (z) >= -(radius) && (z) < (radius))
 195
 196         for (s16 zi0= -m_cloud_radius_i; zi0 < m_cloud_radius_i; zi0++)
 197         for (s16 xi0= -m_cloud_radius_i; xi0 < m_cloud_radius_i; xi0++)
 198         {
 199                 s16 zi = zi0;
 200                 s16 xi = xi0;
 201                 // Draw from front to back (needed for transparency)
 202                 /*if(zi <= 0)
 203                         zi = -m_cloud_radius_i - zi;
 204                 if(xi <= 0)
 205                         xi = -m_cloud_radius_i - xi;*/
 206                 // Draw from back to front
 207                 if(zi >= 0)
 208                         zi = m_cloud_radius_i - zi - 1;
 209                 if(xi >= 0)
 210                         xi = m_cloud_radius_i - xi - 1;
 211
 212                 u32 i = GETINDEX(xi, zi, m_cloud_radius_i);
 213
 214                 if(grid[i] == false)
 215                         continue;
 216
 217                 v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
 218
 219                 video::S3DVertex v[4] = {
 220                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 1),
 221                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 1),
 222                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 0),
 223                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 0)
 224                 };
 225
 226                 /*if(zi <= 0 && xi <= 0){
 227                         v[0].Color.setBlue(255);
 228                         v[1].Color.setBlue(255);
 229                         v[2].Color.setBlue(255);
 230                         v[3].Color.setBlue(255);
 231                 }*/
 232
 233                 f32 rx = cloud_size/2;
 234                 f32 ry = 8 * BS;
 235                 f32 rz = cloud_size / 2;
 236
 237                 for(int i=0; i<num_faces_to_draw; i++)
 238                 {
 239                         switch(i)
 240                         {
 241                         case 0: // top
 242                                 for(int j=0;j<4;j++){
 243                                         v[j].Normal.set(0,1,0);
 244                                 }
 245                                 v[0].Pos.set(-rx, ry,-rz);
 246                                 v[1].Pos.set(-rx, ry, rz);
 247                                 v[2].Pos.set( rx, ry, rz);
 248                                 v[3].Pos.set( rx, ry,-rz);
 249                                 break;
 250                         case 1: // back
 251                                 if (INAREA(xi, zi - 1, m_cloud_radius_i)) {
 252                                         u32 j = GETINDEX(xi, zi - 1, m_cloud_radius_i);
 253                                         if(grid[j])
 254                                                 continue;
 255                                 }
 256                                 for(int j=0;j<4;j++){
 257                                         v[j].Color = c_side_1;
 258                                         v[j].Normal.set(0,0,-1);
 259                                 }
 260                                 v[0].Pos.set(-rx, ry,-rz);
 261                                 v[1].Pos.set( rx, ry,-rz);
 262                                 v[2].Pos.set( rx,-ry,-rz);
 263                                 v[3].Pos.set(-rx,-ry,-rz);
 264                                 break;
 265                         case 2: //right
 266                                 if (INAREA(xi + 1, zi, m_cloud_radius_i)) {
 267                                         u32 j = GETINDEX(xi+1, zi, m_cloud_radius_i);
 268                                         if(grid[j])
 269                                                 continue;
 270                                 }
 271                                 for(int j=0;j<4;j++){
 272                                         v[j].Color = c_side_2;
 273                                         v[j].Normal.set(1,0,0);
 274                                 }
 275                                 v[0].Pos.set( rx, ry,-rz);
 276                                 v[1].Pos.set( rx, ry, rz);
 277                                 v[2].Pos.set( rx,-ry, rz);
 278                                 v[3].Pos.set( rx,-ry,-rz);
 279                                 break;
 280                         case 3: // front
 281                                 if (INAREA(xi, zi + 1, m_cloud_radius_i)) {
 282                                         u32 j = GETINDEX(xi, zi + 1, m_cloud_radius_i);
 283                                         if(grid[j])
 284                                                 continue;
 285                                 }
 286                                 for(int j=0;j<4;j++){
 287                                         v[j].Color = c_side_1;
 288                                         v[j].Normal.set(0,0,-1);
 289                                 }
 290                                 v[0].Pos.set( rx, ry, rz);
 291                                 v[1].Pos.set(-rx, ry, rz);
 292                                 v[2].Pos.set(-rx,-ry, rz);
 293                                 v[3].Pos.set( rx,-ry, rz);
 294                                 break;
 295                         case 4: // left
 296                                 if (INAREA(xi-1, zi, m_cloud_radius_i)) {
 297                                         u32 j = GETINDEX(xi-1, zi, m_cloud_radius_i);
 298                                         if(grid[j])
 299                                                 continue;
 300                                 }
 301                                 for(int j=0;j<4;j++){
 302                                         v[j].Color = c_side_2;
 303                                         v[j].Normal.set(-1,0,0);
 304                                 }
 305                                 v[0].Pos.set(-rx, ry, rz);
 306                                 v[1].Pos.set(-rx, ry,-rz);
 307                                 v[2].Pos.set(-rx,-ry,-rz);
 308                                 v[3].Pos.set(-rx,-ry, rz);
 309                                 break;
 310                         case 5: // bottom
 311                                 for(int j=0;j<4;j++){
 312                                         v[j].Color = c_bottom;
 313                                         v[j].Normal.set(0,-1,0);
 314                                 }
 315                                 v[0].Pos.set( rx,-ry, rz);
 316                                 v[1].Pos.set(-rx,-ry, rz);
 317                                 v[2].Pos.set(-rx,-ry,-rz);
 318                                 v[3].Pos.set( rx,-ry,-rz);
 319                                 break;
 320                         }
 321
 322                         v3f pos(p0.X, m_cloud_y, p0.Y);
 323                         pos -= intToFloat(m_camera_offset, BS);
 324
 325                         for(u16 i=0; i<4; i++)
 326                                 v[i].Pos += pos;
 327                         u16 indices[] = {0,1,2,2,3,0};
 328                         driver->drawVertexPrimitiveList(v, 4, indices, 2,
 329                                         video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
 330                 }
 331         }
 332
 333         delete[] grid;
 334
 335         // Restore fog settings
 336         driver->setFog(fog_color, fog_type, fog_start, fog_end, fog_density,
 337                         fog_pixelfog, fog_rangefog);
 338 }
 339
 340 void Clouds::step(float dtime)
 341 {
 342         m_time += dtime;
 343 }
 344
 345 void Clouds::update(v2f camera_p, video::SColorf color)
 346 {
 347         m_camera_pos = camera_p;
 348         m_color = color;
 349         //m_brightness = brightness;
 350         //dstream<<"m_brightness="<<m_brightness<<std::endl;
 351 }
 352