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
  25 Clouds::Clouds(
  26                 scene::ISceneNode* parent,
  27                 scene::ISceneManager* mgr,
  28                 s32 id,
  29                 float cloud_y,
  30                 u32 seed
  31 ):
  32         scene::ISceneNode(parent, mgr, id),
  33         m_cloud_y(cloud_y),
  34         m_seed(seed),
  35         m_camera_pos(0,0),
  36         m_time(0)
  37 {
  38         dstream<<__FUNCTION_NAME<<std::endl;
  39
  40         m_material.setFlag(video::EMF_LIGHTING, false);
  41         m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
  42         m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
  43         m_material.setFlag(video::EMF_FOG_ENABLE, false);
  44         //m_material.setFlag(video::EMF_ANTI_ALIASING, true);
  45         //m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  46
  47         m_box = core::aabbox3d<f32>(-BS*1000000,cloud_y-BS,-BS*1000000,
  48                         BS*1000000,cloud_y+BS,BS*1000000);
  49
  50 }
  51
  52 Clouds::~Clouds()
  53 {
  54         dstream<<__FUNCTION_NAME<<std::endl;
  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         driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
  80         driver->setMaterial(m_material);
  81
  82         /*
  83                 Clouds move from X+ towards X-
  84         */
  85
  86         const s16 cloud_radius_i = 12;
  87         const float cloud_size = BS*50;
  88         const v2f cloud_speed(-BS*2, 0);
  89
  90         // Position of cloud noise origin in world coordinates
  91         v2f world_cloud_origin_pos_f = m_time*cloud_speed;
  92         // Position of cloud noise origin from the camera
  93         v2f cloud_origin_from_camera_f = world_cloud_origin_pos_f - m_camera_pos;
  94         // The center point of drawing in the noise
  95         v2f center_of_drawing_in_noise_f = -cloud_origin_from_camera_f;
  96         // The integer center point of drawing in the noise
  97         v2s16 center_of_drawing_in_noise_i(
  98                 MYROUND(center_of_drawing_in_noise_f.X / cloud_size),
  99                 MYROUND(center_of_drawing_in_noise_f.Y / cloud_size)
 100         );
 101         // The world position of the integer center point of drawing in the noise
 102         v2f world_center_of_drawing_in_noise_f = v2f(
 103                 center_of_drawing_in_noise_i.X * cloud_size,
 104                 center_of_drawing_in_noise_i.Y * cloud_size
 105         ) + world_cloud_origin_pos_f;
 106
 107         for(s16 zi=-cloud_radius_i; zi<cloud_radius_i; zi++)
 108         for(s16 xi=-cloud_radius_i; xi<cloud_radius_i; xi++)
 109         {
 110                 v2s16 p_in_noise_i(
 111                         xi+center_of_drawing_in_noise_i.X,
 112                         zi+center_of_drawing_in_noise_i.Y
 113                 );
 114
 115                 /*if((p_in_noise_i.X + p_in_noise_i.Y)%2==0)
 116                         continue;*/
 117                 /*if((p_in_noise_i.X/2 + p_in_noise_i.Y/2)%2==0)
 118                         continue;*/
 119
 120                 v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
 121
 122                 double noise = noise2d_perlin_abs(
 123                                 (float)p_in_noise_i.X*cloud_size/BS/200,
 124                                 (float)p_in_noise_i.Y*cloud_size/BS/200,
 125                                 m_seed, 3, 0.4);
 126                 if(noise < 0.8)
 127                         continue;
 128
 129                 v2f p1 = p0 + v2f(1,1)*cloud_size;
 130
 131                 //video::SColor c(128,255,255,255);
 132                 float b = m_brightness;
 133                 video::SColor c(128,b*230,b*230,b*255);
 134                 video::S3DVertex vertices[4] =
 135                 {
 136                         video::S3DVertex(p0.X,m_cloud_y,p0.Y, 0,0,0, c, 0,1),
 137                         video::S3DVertex(p0.X,m_cloud_y,p1.Y, 0,0,0, c, 1,1),
 138                         video::S3DVertex(p1.X,m_cloud_y,p1.Y, 0,0,0, c, 1,0),
 139                         video::S3DVertex(p1.X,m_cloud_y,p0.Y, 0,0,0, c, 0,0),
 140                 };
 141                 u16 indices[] = {0,1,2,2,3,0};
 142                 driver->drawVertexPrimitiveList(vertices, 4, indices, 2,
 143                                 video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
 144         }
 145 }
 146
 147 void Clouds::step(float dtime)
 148 {
 149         m_time += dtime;
 150 }
 151
 152 void Clouds::update(v2f camera_p, float brightness)
 153 {
 154         m_camera_pos = camera_p;
 155         m_brightness = brightness;
 156 }
 157