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                 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         m_material.setFlag(video::EMF_LIGHTING, false);
  42         m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
  43         m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
  44         m_material.setFlag(video::EMF_FOG_ENABLE, false);
  45         //m_material.setFlag(video::EMF_ANTI_ALIASING, true);
  46         //m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  47
  48         m_box = core::aabbox3d<f32>(-BS*1000000,cloud_y-BS,-BS*1000000,
  49                         BS*1000000,cloud_y+BS,BS*1000000);
  50
  51 }
  52
  53 Clouds::~Clouds()
  54 {
  55 }
  56
  57 void Clouds::OnRegisterSceneNode()
  58 {
  59         if(IsVisible)
  60         {
  61                 //SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
  62                 SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
  63         }
  64
  65         ISceneNode::OnRegisterSceneNode();
  66 }
  67
  68 #define MYROUND(x) (x > 0.0 ? (int)x : (int)x - 1)
  69
  70 void Clouds::render()
  71 {
  72         video::IVideoDriver* driver = SceneManager->getVideoDriver();
  73
  74         /*if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
  75                 return;*/
  76         if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
  77                 return;
  78
  79         ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
  80
  81         int num_faces_to_draw = 1;
  82         if(g_settings->getBool("enable_3d_clouds"))
  83                 num_faces_to_draw = 6;
  84
  85         driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
  86         driver->setMaterial(m_material);
  87
  88         /*
  89                 Clouds move from X+ towards X-
  90         */
  91
  92         const s16 cloud_radius_i = 12;
  93         const float cloud_size = BS*48;
  94         const v2f cloud_speed(-BS*2, 0);
  95
  96         // Position of cloud noise origin in world coordinates
  97         v2f world_cloud_origin_pos_f = m_time*cloud_speed;
  98         // Position of cloud noise origin from the camera
  99         v2f cloud_origin_from_camera_f = world_cloud_origin_pos_f - m_camera_pos;
 100         // The center point of drawing in the noise
 101         v2f center_of_drawing_in_noise_f = -cloud_origin_from_camera_f;
 102         // The integer center point of drawing in the noise
 103         v2s16 center_of_drawing_in_noise_i(
 104                 MYROUND(center_of_drawing_in_noise_f.X / cloud_size),
 105                 MYROUND(center_of_drawing_in_noise_f.Y / cloud_size)
 106         );
 107         // The world position of the integer center point of drawing in the noise
 108         v2f world_center_of_drawing_in_noise_f = v2f(
 109                 center_of_drawing_in_noise_i.X * cloud_size,
 110                 center_of_drawing_in_noise_i.Y * cloud_size
 111         ) + world_cloud_origin_pos_f;
 112
 113         for(s16 zi=-cloud_radius_i; zi<cloud_radius_i; zi++)
 114         for(s16 xi=-cloud_radius_i; xi<cloud_radius_i; xi++)
 115         {
 116                 v2s16 p_in_noise_i(
 117                         xi+center_of_drawing_in_noise_i.X,
 118                         zi+center_of_drawing_in_noise_i.Y
 119                 );
 120
 121                 /*if((p_in_noise_i.X + p_in_noise_i.Y)%2==0)
 122                         continue;*/
 123                 /*if((p_in_noise_i.X/2 + p_in_noise_i.Y/2)%2==0)
 124                         continue;*/
 125
 126                 v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
 127
 128                 double noise = noise2d_perlin_abs(
 129                                 (float)p_in_noise_i.X*cloud_size/BS/200,
 130                                 (float)p_in_noise_i.Y*cloud_size/BS/200,
 131                                 m_seed, 3, 0.4);
 132                 if(noise < 0.95)
 133                         continue;
 134
 135                 float b = m_brightness;
 136                 video::SColor c_top(128,b*240,b*240,b*255);
 137                 video::SColor c_side_1(128,b*230,b*230,b*255);
 138                 video::SColor c_side_2(128,b*220,b*220,b*245);
 139                 video::SColor c_bottom(128,b*205,b*205,b*230);
 140
 141                 video::S3DVertex v[4] =
 142                 {
 143                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 1),
 144                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 1),
 145                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 0),
 146                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 0)
 147                 };
 148
 149                 f32 rx = cloud_size;
 150                 f32 ry = 8*BS;
 151                 f32 rz = cloud_size;
 152
 153                 for(int i=0; i<num_faces_to_draw; i++)
 154                 {
 155                         switch(i)
 156                         {
 157                                 case 0: // top
 158                                         v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 159                                         v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 160                                         v[2].Pos.X= rx; v[2].Pos.Y= ry; v[2].Pos.Z= rz;
 161                                         v[3].Pos.X= rx; v[3].Pos.Y= ry, v[3].Pos.Z=-rz;
 162                                         break;
 163                                 case 1: // back
 164                                         for(int j=0;j<4;j++)
 165                                                 v[j].Color=c_side_1;
 166                                         v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 167                                         v[1].Pos.X= rx; v[1].Pos.Y= ry; v[1].Pos.Z=-rz;
 168                                         v[2].Pos.X= rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 169                                         v[3].Pos.X=-rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
 170                                         break;
 171                                 case 2: //right
 172                                         for(int j=0;j<4;j++)
 173                                                 v[j].Color=c_side_2;
 174                                         v[0].Pos.X= rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 175                                         v[1].Pos.X= rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 176                                         v[2].Pos.X= rx; v[2].Pos.Y=-ry; v[2].Pos.Z= rz;
 177                                         v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
 178                                         break;
 179                                 case 3: // front
 180                                         for(int j=0;j<4;j++)
 181                                                 v[j].Color=c_side_1;
 182                                         v[0].Pos.X= rx; v[0].Pos.Y= ry; v[0].Pos.Z= rz;
 183                                         v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 184                                         v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z= rz;
 185                                         v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z= rz;
 186                                         break;
 187                                 case 4: // left
 188                                         for(int j=0;j<4;j++)
 189                                                 v[j].Color=c_side_2;
 190                                         v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z= rz;
 191                                         v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z=-rz;
 192                                         v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 193                                         v[3].Pos.X=-rx; v[3].Pos.Y=-ry, v[3].Pos.Z= rz;
 194                                         break;
 195                                 case 5: // bottom
 196                                         for(int j=0;j<4;j++)
 197                                                 v[j].Color=c_bottom;
 198                                         v[0].Pos.X= rx; v[0].Pos.Y=-ry; v[0].Pos.Z= rz;
 199                                         v[1].Pos.X=-rx; v[1].Pos.Y=-ry; v[1].Pos.Z= rz;
 200                                         v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 201                                         v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
 202                                         break;
 203                         }
 204
 205                         v3f pos = v3f(p0.X,m_cloud_y,p0.Y);
 206
 207                         for(u16 i=0; i<4; i++)
 208                                 v[i].Pos += pos;
 209                         u16 indices[] = {0,1,2,2,3,0};
 210                         driver->drawVertexPrimitiveList(v, 4, indices, 2,
 211                                         video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
 212                 }
 213
 214         }
 215 }
 216
 217 void Clouds::step(float dtime)
 218 {
 219         m_time += dtime;
 220 }
 221
 222 void Clouds::update(v2f camera_p, float brightness)
 223 {
 224         m_camera_pos = camera_p;
 225         m_brightness = brightness;
 226 }
 227