src/sky.h

   1 /*
   2 Minetest
   3 Copyright (C) 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 "irrlichttypes_extrabloated.h"
  21 #include <ISceneNode.h>
  22 #include "camera.h"
  23
  24 #ifndef SKY_HEADER
  25 #define SKY_HEADER
  26
  27 #define SKY_MATERIAL_COUNT 5
  28 #define SKY_STAR_COUNT 200
  29
  30 class ITextureSource;
  31
  32 // Skybox, rendered with zbuffer turned off, before all other nodes.
  33 class Sky : public scene::ISceneNode
  34 {
  35 public:
  36         //! constructor
  37         Sky(scene::ISceneNode* parent, scene::ISceneManager* mgr, s32 id,
  38                         ITextureSource *tsrc);
  39
  40         virtual void OnRegisterSceneNode();
  41
  42         //! renders the node.
  43         virtual void render();
  44
  45         virtual const core::aabbox3d<f32>& getBoundingBox() const;
  46
  47         // Used by Irrlicht for optimizing rendering
  48         virtual video::SMaterial& getMaterial(u32 i)
  49         { return m_materials[i]; }
  50
  51         // Used by Irrlicht for optimizing rendering
  52         virtual u32 getMaterialCount() const
  53         { return SKY_MATERIAL_COUNT; }
  54
  55         void update(float m_time_of_day, float time_brightness,
  56                         float direct_brightness, bool sunlight_seen, CameraMode cam_mode,
  57                         float yaw, float pitch);
  58
  59         float getBrightness(){ return m_brightness; }
  60
  61         video::SColor getBgColor(){
  62                 return m_visible ? m_bgcolor : m_fallback_bg_color;
  63         }
  64         video::SColor getSkyColor(){
  65                 return m_visible ? m_skycolor : m_fallback_bg_color;
  66         }
  67
  68         bool getCloudsVisible(){ return m_clouds_visible && m_visible; }
  69         video::SColorf getCloudColor(){ return m_cloudcolor_f; }
  70
  71         void setVisible(bool visible){ m_visible = visible; }
  72         void setFallbackBgColor(const video::SColor &fallback_bg_color){
  73                 m_fallback_bg_color = fallback_bg_color;
  74         }
  75
  76 private:
  77         core::aabbox3d<f32> Box;
  78         video::SMaterial m_materials[SKY_MATERIAL_COUNT];
  79
  80         // How much sun & moon transition should affect horizon color
  81         float m_horizon_blend()
  82         {
  83                 if (!m_sunlight_seen)
  84                         return 0;
  85                 float x = m_time_of_day >= 0.5 ? (1 - m_time_of_day) * 2 : m_time_of_day * 2;
  86
  87                 if (x <= 0.3)
  88                         return 0;
  89                 if (x <= 0.4) // when the sun and moon are aligned
  90                         return (x - 0.3) * 10;
  91                 if (x <= 0.5)
  92                         return (0.5 - x) * 10;
  93                 return 0;
  94         }
  95
  96         // Mix two colors by a given amount
  97         video::SColor m_mix_scolor(video::SColor col1, video::SColor col2, f32 factor)
  98         {
  99                 video::SColor result = video::SColor(
 100                         col1.getAlpha() * (1 - factor) + col2.getAlpha() * factor,
 101                         col1.getRed() * (1 - factor) + col2.getRed() * factor,
 102                         col1.getGreen() * (1 - factor) + col2.getGreen() * factor,
 103                         col1.getBlue() * (1 - factor) + col2.getBlue() * factor);
 104                 return result;
 105         }
 106         video::SColorf m_mix_scolorf(video::SColorf col1, video::SColorf col2, f32 factor)
 107         {
 108                 video::SColorf result = video::SColorf(
 109                         col1.r * (1 - factor) + col2.r * factor,
 110                         col1.g * (1 - factor) + col2.g * factor,
 111                         col1.b * (1 - factor) + col2.b * factor,
 112                         col1.a * (1 - factor) + col2.a * factor);
 113                 return result;
 114         }
 115
 116         bool m_visible;
 117         video::SColor m_fallback_bg_color; // Used when m_visible=false
 118         bool m_first_update;
 119         float m_time_of_day;
 120         float m_time_brightness;
 121         bool m_sunlight_seen;
 122         float m_brightness;
 123         float m_cloud_brightness;
 124         bool m_clouds_visible;
 125         bool m_directional_colored_fog;
 126         video::SColorf m_bgcolor_bright_f;
 127         video::SColorf m_skycolor_bright_f;
 128         video::SColorf m_cloudcolor_bright_f;
 129         video::SColor m_bgcolor;
 130         video::SColor m_skycolor;
 131         video::SColorf m_cloudcolor_f;
 132         v3f m_stars[SKY_STAR_COUNT];
 133         video::S3DVertex m_star_vertices[SKY_STAR_COUNT*4];
 134         video::ITexture* m_sun_texture;
 135         video::ITexture* m_moon_texture;
 136         video::ITexture* m_sun_tonemap;
 137         video::ITexture* m_moon_tonemap;
 138 };
 139
 140 #endif
 141