src/farmesh.cpp

   1 /*
   2 Part of Minetest-c55
   3 Copyright (C) 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 /*
  21         A quick messy implementation of terrain rendering for a long
  22         distance according to map seed
  23 */
  24
  25 #include "farmesh.h"
  26 #include "constants.h"
  27 #include "debug.h"
  28 #include "noise.h"
  29 #include "map.h"
  30
  31 FarMesh::FarMesh(
  32                 scene::ISceneNode* parent,
  33                 scene::ISceneManager* mgr,
  34                 s32 id,
  35                 u64 seed
  36 ):
  37         scene::ISceneNode(parent, mgr, id),
  38         m_seed(seed),
  39         m_camera_pos(0,0),
  40         m_time(0)
  41 {
  42         dstream<<__FUNCTION_NAME<<std::endl;
  43
  44         m_material.setFlag(video::EMF_LIGHTING, false);
  45         m_material.setFlag(video::EMF_BACK_FACE_CULLING, true);
  46         m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
  47         m_material.setFlag(video::EMF_FOG_ENABLE, false);
  48         //m_material.setFlag(video::EMF_ANTI_ALIASING, true);
  49         //m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
  50
  51         m_box = core::aabbox3d<f32>(-BS*1000000,-BS*31000,-BS*1000000,
  52                         BS*1000000,BS*31000,BS*1000000);
  53
  54 }
  55
  56 FarMesh::~FarMesh()
  57 {
  58         dstream<<__FUNCTION_NAME<<std::endl;
  59 }
  60
  61 void FarMesh::OnRegisterSceneNode()
  62 {
  63         if(IsVisible)
  64         {
  65                 //SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
  66                 //SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
  67                 SceneManager->registerNodeForRendering(this, scene::ESNRP_SKY_BOX);
  68         }
  69
  70         ISceneNode::OnRegisterSceneNode();
  71 }
  72
  73 #define MYROUND(x) (x > 0.0 ? (int)x : (int)x - 1)
  74
  75 // Temporary hack
  76 core::map<v2s16, float> g_heights;
  77
  78 float ground_height(u64 seed, v2s16 p2d)
  79 {
  80         core::map<v2s16, float>::Node *n = g_heights.find(p2d);
  81         if(n)
  82                 return n->getValue();
  83         float avg_mud_amount = 4;
  84         float gh = BS*base_rock_level_2d(seed, p2d) + avg_mud_amount*BS;
  85         //gh *= 10;
  86         g_heights[p2d] = gh;
  87         return gh;
  88 }
  89
  90 void FarMesh::render()
  91 {
  92         video::IVideoDriver* driver = SceneManager->getVideoDriver();
  93
  94         /*if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
  95                 return;*/
  96         /*if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
  97                 return;*/
  98         if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SKY_BOX)
  99                 return;
 100
 101         driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
 102         driver->setMaterial(m_material);
 103
 104         const s16 grid_radius_i = 12;
 105         const float grid_size = BS*50;
 106         const v2f grid_speed(-BS*0, 0);
 107
 108         // Position of grid noise origin in world coordinates
 109         v2f world_grid_origin_pos_f(0,0);
 110         // Position of grid noise origin from the camera
 111         v2f grid_origin_from_camera_f = world_grid_origin_pos_f - m_camera_pos;
 112         // The center point of drawing in the noise
 113         v2f center_of_drawing_in_noise_f = -grid_origin_from_camera_f;
 114         // The integer center point of drawing in the noise
 115         v2s16 center_of_drawing_in_noise_i(
 116                 MYROUND(center_of_drawing_in_noise_f.X / grid_size),
 117                 MYROUND(center_of_drawing_in_noise_f.Y / grid_size)
 118         );
 119         // The world position of the integer center point of drawing in the noise
 120         v2f world_center_of_drawing_in_noise_f = v2f(
 121                 center_of_drawing_in_noise_i.X * grid_size,
 122                 center_of_drawing_in_noise_i.Y * grid_size
 123         ) + world_grid_origin_pos_f;
 124
 125         for(s16 zi=-grid_radius_i; zi<grid_radius_i; zi++)
 126         for(s16 xi=-grid_radius_i; xi<grid_radius_i; xi++)
 127         {
 128                 v2s16 p_in_noise_i(
 129                         xi+center_of_drawing_in_noise_i.X,
 130                         zi+center_of_drawing_in_noise_i.Y
 131                 );
 132
 133                 /*if((p_in_noise_i.X + p_in_noise_i.Y)%2==0)
 134                         continue;*/
 135                 /*if((p_in_noise_i.X/2 + p_in_noise_i.Y/2)%2==0)
 136                         continue;*/
 137
 138                 v2f p0 = v2f(xi,zi)*grid_size + world_center_of_drawing_in_noise_f;
 139
 140                 /*double noise[4];
 141                 double d = 100*BS;
 142                 noise[0] = d*noise2d_perlin(
 143                                 (float)(p_in_noise_i.X+0)*grid_size/BS/100,
 144                                 (float)(p_in_noise_i.Y+0)*grid_size/BS/100,
 145                                 m_seed, 3, 0.5);
 146
 147                 noise[1] = d*noise2d_perlin(
 148                                 (float)(p_in_noise_i.X+0)*grid_size/BS/100,
 149                                 (float)(p_in_noise_i.Y+1)*grid_size/BS/100,
 150                                 m_seed, 3, 0.5);
 151
 152                 noise[2] = d*noise2d_perlin(
 153                                 (float)(p_in_noise_i.X+1)*grid_size/BS/100,
 154                                 (float)(p_in_noise_i.Y+1)*grid_size/BS/100,
 155                                 m_seed, 3, 0.5);
 156
 157                 noise[3] = d*noise2d_perlin(
 158                                 (float)(p_in_noise_i.X+1)*grid_size/BS/100,
 159                                 (float)(p_in_noise_i.Y+0)*grid_size/BS/100,
 160                                 m_seed, 3, 0.5);*/
 161
 162                 float noise[4];
 163                 noise[0] = ground_height(m_seed, v2s16(
 164                                 (p_in_noise_i.X+0)*grid_size/BS,
 165                                 (p_in_noise_i.Y+0)*grid_size/BS));
 166                 noise[1] = ground_height(m_seed, v2s16(
 167                                 (p_in_noise_i.X+0)*grid_size/BS,
 168                                 (p_in_noise_i.Y+1)*grid_size/BS));
 169                 noise[2] = ground_height(m_seed, v2s16(
 170                                 (p_in_noise_i.X+1)*grid_size/BS,
 171                                 (p_in_noise_i.Y+1)*grid_size/BS));
 172                 noise[3] = ground_height(m_seed, v2s16(
 173                                 (p_in_noise_i.X+1)*grid_size/BS,
 174                                 (p_in_noise_i.Y+0)*grid_size/BS));
 175
 176                 float h_min = BS*65535;
 177                 float h_max = -BS*65536;
 178                 for(u32 i=0; i<4; i++)
 179                 {
 180                         if(noise[i] < h_min)
 181                                 h_min = noise[i];
 182                         if(noise[i] > h_max)
 183                                 h_max = noise[i];
 184                 }
 185                 float steepness = (h_max - h_min)/grid_size;
 186
 187                 float h_avg = (noise[0]+noise[1]+noise[2]+noise[3])/4.0;
 188                 float light_f = noise[0]+noise[1]-noise[2]-noise[3];
 189                 light_f /= 100;
 190                 if(light_f < -1.0) light_f = -1.0;
 191                 if(light_f > 1.0) light_f = 1.0;
 192                 //light_f += 1.0;
 193                 //light_f /= 2.0;
 194
 195                 v2f p1 = p0 + v2f(1,1)*grid_size;
 196
 197                 video::SColor c;
 198                 // Detect water
 199                 if(h_avg < WATER_LEVEL*BS && h_max < (WATER_LEVEL+5)*BS)
 200                 {
 201                         c = video::SColor(128,59,86,146);
 202                         /*// Set to water level
 203                         for(u32 i=0; i<4; i++)
 204                         {
 205                                 if(noise[i] < BS*WATER_LEVEL)
 206                                         noise[i] = BS*WATER_LEVEL;
 207                         }*/
 208                         light_f = 0;
 209                 }
 210                 else if(steepness > 2.0)
 211                         c = video::SColor(128,128,128,128);
 212                 else
 213                         c = video::SColor(128,107,134,51);
 214
 215                 // Set to water level
 216                 for(u32 i=0; i<4; i++)
 217                 {
 218                         if(noise[i] < BS*WATER_LEVEL)
 219                                 noise[i] = BS*WATER_LEVEL;
 220                 }
 221
 222                 float b = m_brightness + light_f*0.1*m_brightness;
 223                 if(b < 0) b = 0;
 224                 if(b > 2) b = 2;
 225
 226                 c = video::SColor(128, b*c.getRed(), b*c.getGreen(), b*c.getBlue());
 227
 228                 video::S3DVertex vertices[4] =
 229                 {
 230                         video::S3DVertex(p0.X,noise[0],p0.Y, 0,0,0, c, 0,1),
 231                         video::S3DVertex(p0.X,noise[1],p1.Y, 0,0,0, c, 1,1),
 232                         video::S3DVertex(p1.X,noise[2],p1.Y, 0,0,0, c, 1,0),
 233                         video::S3DVertex(p1.X,noise[3],p0.Y, 0,0,0, c, 0,0),
 234                 };
 235                 u16 indices[] = {0,1,2,2,3,0};
 236                 driver->drawVertexPrimitiveList(vertices, 4, indices, 2,
 237                                 video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
 238         }
 239
 240         driver->clearZBuffer();
 241 }
 242
 243 void FarMesh::step(float dtime)
 244 {
 245         m_time += dtime;
 246 }
 247
 248 void FarMesh::update(v2f camera_p, float brightness)
 249 {
 250         m_camera_pos = camera_p;
 251         m_brightness = brightness;
 252 }
 253