src/clouds.cpp

   1 /*
   2 Minetest-m13
   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                 float cloud_y,
  33                 u32 seed
  34 ):
  35         scene::ISceneNode(parent, mgr, id),
  36         m_cloud_y(cloud_y),
  37         m_seed(seed),
  38         m_camera_pos(0,0),
  39         m_time(0)
  40 {
  41         dstream<<__FUNCTION_NAME<<std::endl;
  42
  43         m_material.setFlag(video::EMF_LIGHTING, false);
  44         m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
  45         m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
  46         m_material.setFlag(video::EMF_FOG_ENABLE, false);
  47         //m_material.setFlag(video::EMF_ANTI_ALIASING, true);
  48         //m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  49
  50         m_box = core::aabbox3d<f32>(-BS*1000000,cloud_y-BS,-BS*1000000,
  51                         BS*1000000,cloud_y+BS,BS*1000000);
  52
  53 }
  54
  55 Clouds::~Clouds()
  56 {
  57         dstream<<__FUNCTION_NAME<<std::endl;
  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                 return;*/
  79         if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
  80                 return;
  81
  82         ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
  83
  84         int num_faces_to_draw = 1;
  85         if(g_settings->getBool("enable_3d_clouds"))
  86                 num_faces_to_draw = 6;
  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*48;
  97         const v2f cloud_speed(-BS*2, 0);
  98
  99         // Position of cloud noise origin in world coordinates
 100         v2f world_cloud_origin_pos_f = m_time*cloud_speed;
 101         // Position of cloud noise origin from the camera
 102         v2f cloud_origin_from_camera_f = world_cloud_origin_pos_f - m_camera_pos;
 103         // The center point of drawing in the noise
 104         v2f center_of_drawing_in_noise_f = -cloud_origin_from_camera_f;
 105         // The integer center point of drawing in the noise
 106         v2s16 center_of_drawing_in_noise_i(
 107                 MYROUND(center_of_drawing_in_noise_f.X / cloud_size),
 108                 MYROUND(center_of_drawing_in_noise_f.Y / cloud_size)
 109         );
 110         // The world position of the integer center point of drawing in the noise
 111         v2f world_center_of_drawing_in_noise_f = v2f(
 112                 center_of_drawing_in_noise_i.X * cloud_size,
 113                 center_of_drawing_in_noise_i.Y * cloud_size
 114         ) + world_cloud_origin_pos_f;
 115
 116         for(s16 zi=-cloud_radius_i; zi<cloud_radius_i; zi++)
 117         for(s16 xi=-cloud_radius_i; xi<cloud_radius_i; xi++)
 118         {
 119                 v2s16 p_in_noise_i(
 120                         xi+center_of_drawing_in_noise_i.X,
 121                         zi+center_of_drawing_in_noise_i.Y
 122                 );
 123
 124                 /*if((p_in_noise_i.X + p_in_noise_i.Y)%2==0)
 125                         continue;*/
 126                 /*if((p_in_noise_i.X/2 + p_in_noise_i.Y/2)%2==0)
 127                         continue;*/
 128
 129                 v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
 130
 131                 double noise = noise2d_perlin_abs(
 132                                 (float)p_in_noise_i.X*cloud_size/BS/200,
 133                                 (float)p_in_noise_i.Y*cloud_size/BS/200,
 134                                 m_seed, 3, 0.4);
 135                 if(noise < 0.95)
 136                         continue;
 137
 138                 float b = m_brightness;
 139                 video::SColor c_top(128,b*240,b*240,b*255);
 140                 video::SColor c_side_1(128,b*230,b*230,b*255);
 141                 video::SColor c_side_2(128,b*220,b*220,b*245);
 142                 video::SColor c_bottom(128,b*205,b*205,b*230);
 143
 144                 video::S3DVertex v[4] =
 145                 {
 146                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 1),
 147                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 1),
 148                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 0),
 149                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 0)
 150                 };
 151
 152                 f32 rx = cloud_size;
 153                 f32 ry = 8*BS;
 154                 f32 rz = cloud_size;
 155
 156                 for(int i=0; i<num_faces_to_draw; i++)
 157                 {
 158                         switch(i)
 159                         {
 160                                 case 0: // top
 161                                         v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 162                                         v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 163                                         v[2].Pos.X= rx; v[2].Pos.Y= ry; v[2].Pos.Z= rz;
 164                                         v[3].Pos.X= rx; v[3].Pos.Y= ry, v[3].Pos.Z=-rz;
 165                                         break;
 166                                 case 1: // back
 167                                         for(int j=0;j<4;j++)
 168                                                 v[j].Color=c_side_1;
 169                                         v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 170                                         v[1].Pos.X= rx; v[1].Pos.Y= ry; v[1].Pos.Z=-rz;
 171                                         v[2].Pos.X= rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 172                                         v[3].Pos.X=-rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
 173                                         break;
 174                                 case 2: //right
 175                                         for(int j=0;j<4;j++)
 176                                                 v[j].Color=c_side_2;
 177                                         v[0].Pos.X= rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 178                                         v[1].Pos.X= rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 179                                         v[2].Pos.X= rx; v[2].Pos.Y=-ry; v[2].Pos.Z= rz;
 180                                         v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
 181                                         break;
 182                                 case 3: // front
 183                                         for(int j=0;j<4;j++)
 184                                                 v[j].Color=c_side_1;
 185                                         v[0].Pos.X= rx; v[0].Pos.Y= ry; v[0].Pos.Z= rz;
 186                                         v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 187                                         v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z= rz;
 188                                         v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z= rz;
 189                                         break;
 190                                 case 4: // left
 191                                         for(int j=0;j<4;j++)
 192                                                 v[j].Color=c_side_2;
 193                                         v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z= rz;
 194                                         v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z=-rz;
 195                                         v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 196                                         v[3].Pos.X=-rx; v[3].Pos.Y=-ry, v[3].Pos.Z= rz;
 197                                         break;
 198                                 case 5: // bottom
 199                                         for(int j=0;j<4;j++)
 200                                                 v[j].Color=c_bottom;
 201                                         v[0].Pos.X= rx; v[0].Pos.Y=-ry; v[0].Pos.Z= rz;
 202                                         v[1].Pos.X=-rx; v[1].Pos.Y=-ry; v[1].Pos.Z= rz;
 203                                         v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 204                                         v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
 205                                         break;
 206                         }
 207
 208                         v3f pos = v3f(p0.X,m_cloud_y,p0.Y);
 209
 210                         for(u16 i=0; i<4; i++)
 211                                 v[i].Pos += pos;
 212                         u16 indices[] = {0,1,2,2,3,0};
 213                         driver->drawVertexPrimitiveList(v, 4, indices, 2,
 214                                         video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
 215                 }
 216
 217         }
 218 }
 219
 220 void Clouds::step(float dtime)
 221 {
 222         m_time += dtime;
 223 }
 224
 225 void Clouds::update(v2f camera_p, float brightness)
 226 {
 227         m_camera_pos = camera_p;
 228         m_brightness = brightness;
 229 }
 230