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+/*
+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;
+}
+