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 "profiler.h"
  25 #include "main.h" // For g_profiler
  26
  27 Clouds::Clouds(
  28                 scene::ISceneNode* parent,
  29                 scene::ISceneManager* mgr,
  30                 s32 id,
  31                 float cloud_y,
  32                 u32 seed
  33 ):
  34         scene::ISceneNode(parent, mgr, id),
  35         m_cloud_y(cloud_y),
  36         m_seed(seed),
  37         m_camera_pos(0,0),
  38         m_time(0)
  39 {
  40         dstream<<__FUNCTION_NAME<<std::endl;
  41
  42         m_material.setFlag(video::EMF_LIGHTING, false);
  43         m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
  44         m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
  45         m_material.setFlag(video::EMF_FOG_ENABLE, false);
  46         //m_material.setFlag(video::EMF_ANTI_ALIASING, true);
  47         //m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  48
  49         m_box = core::aabbox3d<f32>(-BS*1000000,cloud_y-BS,-BS*1000000,
  50                         BS*1000000,cloud_y+BS,BS*1000000);
  51
  52 }
  53
  54 Clouds::~Clouds()
  55 {
  56         dstream<<__FUNCTION_NAME<<std::endl;
  57 }
  58
  59 void Clouds::OnRegisterSceneNode()
  60 {
  61         if(IsVisible)
  62         {
  63                 //SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
  64                 SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
  65         }
  66
  67         ISceneNode::OnRegisterSceneNode();
  68 }
  69
  70 #define MYROUND(x) (x > 0.0 ? (int)x : (int)x - 1)
  71
  72 void Clouds::render()
  73 {
  74         video::IVideoDriver* driver = SceneManager->getVideoDriver();
  75
  76         /*if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
  77                 return;*/
  78         if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
  79                 return;
  80
  81         ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
  82
  83         driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
  84         driver->setMaterial(m_material);
  85
  86         /*
  87                 Clouds move from X+ towards X-
  88         */
  89
  90         const s16 cloud_radius_i = 12;
  91         const float cloud_size = BS*48;
  92         const v2f cloud_speed(-BS*2, 0);
  93
  94         // Position of cloud noise origin in world coordinates
  95         v2f world_cloud_origin_pos_f = m_time*cloud_speed;
  96         // Position of cloud noise origin from the camera
  97         v2f cloud_origin_from_camera_f = world_cloud_origin_pos_f - m_camera_pos;
  98         // The center point of drawing in the noise
  99         v2f center_of_drawing_in_noise_f = -cloud_origin_from_camera_f;
 100         // The integer center point of drawing in the noise
 101         v2s16 center_of_drawing_in_noise_i(
 102                 MYROUND(center_of_drawing_in_noise_f.X / cloud_size),
 103                 MYROUND(center_of_drawing_in_noise_f.Y / cloud_size)
 104         );
 105         // The world position of the integer center point of drawing in the noise
 106         v2f world_center_of_drawing_in_noise_f = v2f(
 107                 center_of_drawing_in_noise_i.X * cloud_size,
 108                 center_of_drawing_in_noise_i.Y * cloud_size
 109         ) + world_cloud_origin_pos_f;
 110
 111         for(s16 zi=-cloud_radius_i; zi<cloud_radius_i; zi++)
 112         for(s16 xi=-cloud_radius_i; xi<cloud_radius_i; xi++)
 113         {
 114                 v2s16 p_in_noise_i(
 115                         xi+center_of_drawing_in_noise_i.X,
 116                         zi+center_of_drawing_in_noise_i.Y
 117                 );
 118
 119                 /*if((p_in_noise_i.X + p_in_noise_i.Y)%2==0)
 120                         continue;*/
 121                 /*if((p_in_noise_i.X/2 + p_in_noise_i.Y/2)%2==0)
 122                         continue;*/
 123
 124                 v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
 125
 126                 double noise = noise2d_perlin_abs(
 127                                 (float)p_in_noise_i.X*cloud_size/BS/200,
 128                                 (float)p_in_noise_i.Y*cloud_size/BS/200,
 129                                 m_seed, 3, 0.4);
 130                 if(noise < 0.95)
 131                         continue;
 132
 133                 float b = m_brightness;
 134                 video::SColor c_top(128,b*240,b*240,b*255);
 135                 video::SColor c_side_1(128,b*230,b*230,b*255);
 136                 video::SColor c_side_2(128,b*220,b*220,b*245);
 137                 video::SColor c_bottom(128,b*205,b*205,b*230);
 138
 139                 video::S3DVertex v[4] =
 140                 {
 141                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 1),
 142                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 1),
 143                         video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 0),
 144                         video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 0)
 145                 };
 146
 147                 f32 rx = cloud_size;
 148                 f32 ry = 8*BS;
 149                 f32 rz = cloud_size;
 150
 151                 for(int i=0;i<6;i++)
 152                 {
 153                         switch(i)
 154                         {
 155                                 case 0: // top
 156                                         v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 157                                         v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 158                                         v[2].Pos.X= rx; v[2].Pos.Y= ry; v[2].Pos.Z= rz;
 159                                         v[3].Pos.X= rx; v[3].Pos.Y= ry, v[3].Pos.Z=-rz;
 160                                         break;
 161                                 case 1: // back
 162                                         for(int j=0;j<4;j++)
 163                                                 v[j].Color=c_side_1;
 164                                         v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 165                                         v[1].Pos.X= rx; v[1].Pos.Y= ry; v[1].Pos.Z=-rz;
 166                                         v[2].Pos.X= rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 167                                         v[3].Pos.X=-rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
 168                                         break;
 169                                 case 2: //right
 170                                         for(int j=0;j<4;j++)
 171                                                 v[j].Color=c_side_2;
 172                                         v[0].Pos.X= rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
 173                                         v[1].Pos.X= rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 174                                         v[2].Pos.X= rx; v[2].Pos.Y=-ry; v[2].Pos.Z= rz;
 175                                         v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
 176                                         break;
 177                                 case 3: // front
 178                                         for(int j=0;j<4;j++)
 179                                                 v[j].Color=c_side_1;
 180                                         v[0].Pos.X= rx; v[0].Pos.Y= ry; v[0].Pos.Z= rz;
 181                                         v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
 182                                         v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z= rz;
 183                                         v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z= rz;
 184                                         break;
 185                                 case 4: // left
 186                                         for(int j=0;j<4;j++)
 187                                                 v[j].Color=c_side_2;
 188                                         v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z= rz;
 189                                         v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z=-rz;
 190                                         v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 191                                         v[3].Pos.X=-rx; v[3].Pos.Y=-ry, v[3].Pos.Z= rz;
 192                                         break;
 193                                 case 5: // bottom
 194                                         for(int j=0;j<4;j++)
 195                                                 v[j].Color=c_bottom;
 196                                         v[0].Pos.X= rx; v[0].Pos.Y=-ry; v[0].Pos.Z= rz;
 197                                         v[1].Pos.X=-rx; v[1].Pos.Y=-ry; v[1].Pos.Z= rz;
 198                                         v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
 199                                         v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
 200                                         break;
 201                         }
 202
 203                         v3f pos = v3f(p0.X,m_cloud_y,p0.Y);
 204
 205                         for(u16 i=0; i<4; i++)
 206                                 v[i].Pos += pos;
 207                         u16 indices[] = {0,1,2,2,3,0};
 208                         driver->drawVertexPrimitiveList(v, 4, indices, 2,
 209                                         video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
 210                 }
 211
 212         }
 213 }
 214
 215 void Clouds::step(float dtime)
 216 {
 217         m_time += dtime;
 218 }
 219
 220 void Clouds::update(v2f camera_p, float brightness)
 221 {
 222         m_camera_pos = camera_p;
 223         m_brightness = brightness;
 224 }
 225