mirror of https://github.com/minetest/minetest.git
254 lines
6.9 KiB
C++
254 lines
6.9 KiB
C++
/*
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Part of Minetest-c55
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Copyright (C) 2011 celeron55, Perttu Ahola <celeron55@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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A quick messy implementation of terrain rendering for a long
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distance according to map seed
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*/
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#include "farmesh.h"
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#include "constants.h"
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#include "debug.h"
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#include "noise.h"
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#include "map.h"
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FarMesh::FarMesh(
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scene::ISceneNode* parent,
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scene::ISceneManager* mgr,
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s32 id,
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u64 seed
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):
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scene::ISceneNode(parent, mgr, id),
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m_seed(seed),
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m_camera_pos(0,0),
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m_time(0)
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{
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dstream<<__FUNCTION_NAME<<std::endl;
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m_material.setFlag(video::EMF_LIGHTING, false);
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m_material.setFlag(video::EMF_BACK_FACE_CULLING, true);
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m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
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m_material.setFlag(video::EMF_FOG_ENABLE, false);
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//m_material.setFlag(video::EMF_ANTI_ALIASING, true);
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//m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
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m_box = core::aabbox3d<f32>(-BS*1000000,-BS*31000,-BS*1000000,
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BS*1000000,BS*31000,BS*1000000);
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}
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FarMesh::~FarMesh()
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{
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dstream<<__FUNCTION_NAME<<std::endl;
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}
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void FarMesh::OnRegisterSceneNode()
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{
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if(IsVisible)
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{
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//SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
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//SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
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SceneManager->registerNodeForRendering(this, scene::ESNRP_SKY_BOX);
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}
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ISceneNode::OnRegisterSceneNode();
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}
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#define MYROUND(x) (x > 0.0 ? (int)x : (int)x - 1)
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// Temporary hack
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core::map<v2s16, float> g_heights;
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float ground_height(u64 seed, v2s16 p2d)
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{
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core::map<v2s16, float>::Node *n = g_heights.find(p2d);
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if(n)
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return n->getValue();
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float avg_mud_amount = 4;
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float gh = BS*base_rock_level_2d(seed, p2d) + avg_mud_amount*BS;
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//gh *= 10;
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g_heights[p2d] = gh;
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return gh;
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}
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void FarMesh::render()
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{
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video::IVideoDriver* driver = SceneManager->getVideoDriver();
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/*if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
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return;*/
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/*if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
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return;*/
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if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SKY_BOX)
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return;
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driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
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driver->setMaterial(m_material);
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const s16 grid_radius_i = 12;
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const float grid_size = BS*50;
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const v2f grid_speed(-BS*0, 0);
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// Position of grid noise origin in world coordinates
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v2f world_grid_origin_pos_f(0,0);
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// Position of grid noise origin from the camera
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v2f grid_origin_from_camera_f = world_grid_origin_pos_f - m_camera_pos;
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// The center point of drawing in the noise
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v2f center_of_drawing_in_noise_f = -grid_origin_from_camera_f;
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// The integer center point of drawing in the noise
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v2s16 center_of_drawing_in_noise_i(
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MYROUND(center_of_drawing_in_noise_f.X / grid_size),
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MYROUND(center_of_drawing_in_noise_f.Y / grid_size)
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);
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// The world position of the integer center point of drawing in the noise
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v2f world_center_of_drawing_in_noise_f = v2f(
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center_of_drawing_in_noise_i.X * grid_size,
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center_of_drawing_in_noise_i.Y * grid_size
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) + world_grid_origin_pos_f;
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for(s16 zi=-grid_radius_i; zi<grid_radius_i; zi++)
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for(s16 xi=-grid_radius_i; xi<grid_radius_i; xi++)
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{
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v2s16 p_in_noise_i(
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xi+center_of_drawing_in_noise_i.X,
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zi+center_of_drawing_in_noise_i.Y
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);
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/*if((p_in_noise_i.X + p_in_noise_i.Y)%2==0)
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continue;*/
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/*if((p_in_noise_i.X/2 + p_in_noise_i.Y/2)%2==0)
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continue;*/
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v2f p0 = v2f(xi,zi)*grid_size + world_center_of_drawing_in_noise_f;
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/*double noise[4];
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double d = 100*BS;
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noise[0] = d*noise2d_perlin(
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(float)(p_in_noise_i.X+0)*grid_size/BS/100,
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(float)(p_in_noise_i.Y+0)*grid_size/BS/100,
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m_seed, 3, 0.5);
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noise[1] = d*noise2d_perlin(
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(float)(p_in_noise_i.X+0)*grid_size/BS/100,
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(float)(p_in_noise_i.Y+1)*grid_size/BS/100,
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m_seed, 3, 0.5);
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noise[2] = d*noise2d_perlin(
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(float)(p_in_noise_i.X+1)*grid_size/BS/100,
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(float)(p_in_noise_i.Y+1)*grid_size/BS/100,
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m_seed, 3, 0.5);
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noise[3] = d*noise2d_perlin(
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(float)(p_in_noise_i.X+1)*grid_size/BS/100,
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(float)(p_in_noise_i.Y+0)*grid_size/BS/100,
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m_seed, 3, 0.5);*/
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float noise[4];
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noise[0] = ground_height(m_seed, v2s16(
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(p_in_noise_i.X+0)*grid_size/BS,
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(p_in_noise_i.Y+0)*grid_size/BS));
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noise[1] = ground_height(m_seed, v2s16(
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(p_in_noise_i.X+0)*grid_size/BS,
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(p_in_noise_i.Y+1)*grid_size/BS));
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noise[2] = ground_height(m_seed, v2s16(
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(p_in_noise_i.X+1)*grid_size/BS,
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(p_in_noise_i.Y+1)*grid_size/BS));
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noise[3] = ground_height(m_seed, v2s16(
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(p_in_noise_i.X+1)*grid_size/BS,
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(p_in_noise_i.Y+0)*grid_size/BS));
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float h_min = BS*65535;
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float h_max = -BS*65536;
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for(u32 i=0; i<4; i++)
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{
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if(noise[i] < h_min)
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h_min = noise[i];
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if(noise[i] > h_max)
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h_max = noise[i];
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}
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float steepness = (h_max - h_min)/grid_size;
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float h_avg = (noise[0]+noise[1]+noise[2]+noise[3])/4.0;
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float light_f = noise[0]+noise[1]-noise[2]-noise[3];
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light_f /= 100;
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if(light_f < -1.0) light_f = -1.0;
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if(light_f > 1.0) light_f = 1.0;
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//light_f += 1.0;
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//light_f /= 2.0;
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v2f p1 = p0 + v2f(1,1)*grid_size;
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video::SColor c;
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// Detect water
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if(h_avg < WATER_LEVEL*BS && h_max < (WATER_LEVEL+5)*BS)
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{
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c = video::SColor(128,59,86,146);
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/*// Set to water level
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for(u32 i=0; i<4; i++)
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{
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if(noise[i] < BS*WATER_LEVEL)
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noise[i] = BS*WATER_LEVEL;
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}*/
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light_f = 0;
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}
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else if(steepness > 2.0)
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c = video::SColor(128,128,128,128);
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else
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c = video::SColor(128,107,134,51);
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// Set to water level
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for(u32 i=0; i<4; i++)
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{
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if(noise[i] < BS*WATER_LEVEL)
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noise[i] = BS*WATER_LEVEL;
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}
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float b = m_brightness + light_f*0.1*m_brightness;
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if(b < 0) b = 0;
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if(b > 2) b = 2;
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c = video::SColor(128, b*c.getRed(), b*c.getGreen(), b*c.getBlue());
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video::S3DVertex vertices[4] =
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{
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video::S3DVertex(p0.X,noise[0],p0.Y, 0,0,0, c, 0,1),
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video::S3DVertex(p0.X,noise[1],p1.Y, 0,0,0, c, 1,1),
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video::S3DVertex(p1.X,noise[2],p1.Y, 0,0,0, c, 1,0),
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video::S3DVertex(p1.X,noise[3],p0.Y, 0,0,0, c, 0,0),
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};
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u16 indices[] = {0,1,2,2,3,0};
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driver->drawVertexPrimitiveList(vertices, 4, indices, 2,
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video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
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}
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driver->clearZBuffer();
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}
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void FarMesh::step(float dtime)
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{
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m_time += dtime;
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}
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void FarMesh::update(v2f camera_p, float brightness)
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{
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m_camera_pos = camera_p;
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m_brightness = brightness;
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}
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