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Diffstat (limited to 'src/clouds.cpp')
| -rw-r--r-- | src/clouds.cpp | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/src/clouds.cpp b/src/clouds.cpp new file mode 100644 index 000000000..20a1c12db --- /dev/null +++ b/src/clouds.cpp @@ -0,0 +1,157 @@ +/* +Minetest-c55 +Copyright (C) 2010 celeron55, Perttu Ahola <celeron55@gmail.com> + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License along +with this program; if not, write to the Free Software Foundation, Inc., +51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. +*/ + +#include "clouds.h" +#include "noise.h" +#include "constants.h" +#include "debug.h" + +Clouds::Clouds( + scene::ISceneNode* parent, + scene::ISceneManager* mgr, + s32 id, + float cloud_y, + u32 seed +): + scene::ISceneNode(parent, mgr, id), + m_cloud_y(cloud_y), + m_seed(seed), + m_camera_pos(0,0), + m_time(0) +{ + dstream<<__FUNCTION_NAME<<std::endl; + + m_material.setFlag(video::EMF_LIGHTING, false); + m_material.setFlag(video::EMF_BACK_FACE_CULLING, false); + m_material.setFlag(video::EMF_BILINEAR_FILTER, false); + m_material.setFlag(video::EMF_FOG_ENABLE, false); + //m_material.setFlag(video::EMF_ANTI_ALIASING, true); + //m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA; + + m_box = core::aabbox3d<f32>(-BS*1000000,cloud_y-BS,-BS*1000000, + BS*1000000,cloud_y+BS,BS*1000000); + +} + +Clouds::~Clouds() +{ + dstream<<__FUNCTION_NAME<<std::endl; +} + +void Clouds::OnRegisterSceneNode() +{ + if(IsVisible) + { + SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID); + //SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT); + } + + ISceneNode::OnRegisterSceneNode(); +} + +#define MYROUND(x) (x > 0.0 ? (int)x : (int)x - 1) + +void Clouds::render() +{ + video::IVideoDriver* driver = SceneManager->getVideoDriver(); + + /*if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT) + return;*/ + if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID) + return; + + driver->setTransform(video::ETS_WORLD, AbsoluteTransformation); + driver->setMaterial(m_material); + + /* + Clouds move from X+ towards X- + */ + + const s16 cloud_radius_i = 12; + const float cloud_size = BS*50; + const v2f cloud_speed(-BS*2, 0); + + // Position of cloud noise origin in world coordinates + v2f world_cloud_origin_pos_f = m_time*cloud_speed; + // Position of cloud noise origin from the camera + v2f cloud_origin_from_camera_f = world_cloud_origin_pos_f - m_camera_pos; + // The center point of drawing in the noise + v2f center_of_drawing_in_noise_f = -cloud_origin_from_camera_f; + // The integer center point of drawing in the noise + v2s16 center_of_drawing_in_noise_i( + MYROUND(center_of_drawing_in_noise_f.X / cloud_size), + MYROUND(center_of_drawing_in_noise_f.Y / cloud_size) + ); + // The world position of the integer center point of drawing in the noise + v2f world_center_of_drawing_in_noise_f = v2f( + center_of_drawing_in_noise_i.X * cloud_size, + center_of_drawing_in_noise_i.Y * cloud_size + ) + world_cloud_origin_pos_f; + + for(s16 zi=-cloud_radius_i; zi<cloud_radius_i; zi++) + for(s16 xi=-cloud_radius_i; xi<cloud_radius_i; xi++) + { + v2s16 p_in_noise_i( + xi+center_of_drawing_in_noise_i.X, + zi+center_of_drawing_in_noise_i.Y + ); + + /*if((p_in_noise_i.X + p_in_noise_i.Y)%2==0) + continue;*/ + /*if((p_in_noise_i.X/2 + p_in_noise_i.Y/2)%2==0) + continue;*/ + + v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f; + + double noise = noise2d_perlin( + (float)p_in_noise_i.X*cloud_size/BS/100, + (float)p_in_noise_i.Y*cloud_size/BS/100, + m_seed, 3, 0.5); + if(noise < 0) + continue; + + v2f p1 = p0 + v2f(1,1)*cloud_size; + + //video::SColor c(128,255,255,255); + float b = m_brightness; + video::SColor c(128,b*230,b*230,b*255); + video::S3DVertex vertices[4] = + { + video::S3DVertex(p0.X,m_cloud_y,p0.Y, 0,0,0, c, 0,1), + video::S3DVertex(p0.X,m_cloud_y,p1.Y, 0,0,0, c, 1,1), + video::S3DVertex(p1.X,m_cloud_y,p1.Y, 0,0,0, c, 1,0), + video::S3DVertex(p1.X,m_cloud_y,p0.Y, 0,0,0, c, 0,0), + }; + u16 indices[] = {0,1,2,2,3,0}; + driver->drawVertexPrimitiveList(vertices, 4, indices, 2, + video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT); + } +} + +void Clouds::step(float dtime) +{ + m_time += dtime; +} + +void Clouds::update(v2f camera_p, float brightness) +{ + m_camera_pos = camera_p; + m_brightness = brightness; +} + |