324 lines
10 KiB
C++
324 lines
10 KiB
C++
/*
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Minetest
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Copyright (C) 2010-2013 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 Lesser General Public License as published by
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the Free Software Foundation; either version 3.0 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser 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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#include "clouds.h"
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#include "noise.h"
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#include "constants.h"
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#include "debug.h"
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#include "profiler.h"
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#include "settings.h"
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// Menu clouds are created later
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class Clouds;
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Clouds *g_menuclouds = NULL;
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irr::scene::ISceneManager *g_menucloudsmgr = NULL;
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static void cloud_3d_setting_changed(const std::string &settingname, void *data)
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{
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// TODO: only re-read cloud settings, not height or radius
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((Clouds *)data)->readSettings();
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}
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static const std::vector<u16> quad_indices = []() {
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int quad_count = 0x10000 / 4; // max number of quads that can be drawn with 16-bit indices
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std::vector<u16> indices;
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indices.reserve(quad_count * 6);
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for (int k = 0; k < quad_count; k++) {
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indices.push_back(4 * k + 0);
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indices.push_back(4 * k + 1);
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indices.push_back(4 * k + 2);
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indices.push_back(4 * k + 2);
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indices.push_back(4 * k + 3);
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indices.push_back(4 * k + 0);
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}
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return indices;
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}();
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Clouds::Clouds(
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scene::ISceneNode* parent,
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scene::ISceneManager* mgr,
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s32 id,
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u32 seed,
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s16 cloudheight
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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(0.0f, 0.0f, 0.0f),
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m_origin(0.0f, 0.0f),
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m_camera_offset(0.0f, 0.0f, 0.0f),
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m_color(1.0f, 1.0f, 1.0f, 1.0f)
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{
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m_material.setFlag(video::EMF_LIGHTING, false);
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//m_material.setFlag(video::EMF_BACK_FACE_CULLING, 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, true);
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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_material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
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m_params.density = 0.4f;
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m_params.thickness = 16.0f;
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m_params.color_bright = video::SColor(229, 240, 240, 255);
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m_params.color_ambient = video::SColor(255, 0, 0, 0);
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m_params.speed = v2f(0.0f, -2.0f);
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m_passed_cloud_y = cloudheight;
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readSettings();
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g_settings->registerChangedCallback("enable_3d_clouds",
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&cloud_3d_setting_changed, this);
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updateBox();
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}
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Clouds::~Clouds()
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{
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g_settings->deregisterChangedCallback("enable_3d_clouds",
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&cloud_3d_setting_changed, this);
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}
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void Clouds::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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}
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ISceneNode::OnRegisterSceneNode();
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}
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void Clouds::render()
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{
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if (m_params.density <= 0.0f)
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return; // no need to do anything
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video::IVideoDriver* driver = SceneManager->getVideoDriver();
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if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_TRANSPARENT)
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//if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
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return;
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ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
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int num_faces_to_draw = m_enable_3d ? 6 : 1;
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m_material.setFlag(video::EMF_BACK_FACE_CULLING, m_enable_3d);
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driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
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driver->setMaterial(m_material);
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/*
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Clouds move from Z+ towards Z-
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*/
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static const float cloud_size = BS * 64.0f;
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const float cloud_full_radius = cloud_size * m_cloud_radius_i;
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// Position of cloud noise origin from the camera
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v2f cloud_origin_from_camera_f = m_origin - v2f(m_camera_pos.X, m_camera_pos.Z);
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// The center point of drawing in the noise
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v2f center_of_drawing_in_noise_f = -cloud_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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std::floor(center_of_drawing_in_noise_f.X / cloud_size),
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std::floor(center_of_drawing_in_noise_f.Y / cloud_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 * cloud_size,
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center_of_drawing_in_noise_i.Y * cloud_size
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) + m_origin;
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/*video::SColor c_top(128,b*240,b*240,b*255);
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video::SColor c_side_1(128,b*230,b*230,b*255);
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video::SColor c_side_2(128,b*220,b*220,b*245);
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video::SColor c_bottom(128,b*205,b*205,b*230);*/
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video::SColorf c_top_f(m_color);
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video::SColorf c_side_1_f(m_color);
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video::SColorf c_side_2_f(m_color);
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video::SColorf c_bottom_f(m_color);
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c_side_1_f.r *= 0.95;
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c_side_1_f.g *= 0.95;
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c_side_1_f.b *= 0.95;
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c_side_2_f.r *= 0.90;
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c_side_2_f.g *= 0.90;
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c_side_2_f.b *= 0.90;
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c_bottom_f.r *= 0.80;
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c_bottom_f.g *= 0.80;
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c_bottom_f.b *= 0.80;
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video::SColor c_top = c_top_f.toSColor();
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video::SColor c_side_1 = c_side_1_f.toSColor();
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video::SColor c_side_2 = c_side_2_f.toSColor();
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video::SColor c_bottom = c_bottom_f.toSColor();
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// Get fog parameters for setting them back later
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video::SColor fog_color(0,0,0,0);
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video::E_FOG_TYPE fog_type = video::EFT_FOG_LINEAR;
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f32 fog_start = 0;
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f32 fog_end = 0;
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f32 fog_density = 0;
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bool fog_pixelfog = false;
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bool fog_rangefog = false;
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driver->getFog(fog_color, fog_type, fog_start, fog_end, fog_density,
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fog_pixelfog, fog_rangefog);
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// Set our own fog
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driver->setFog(fog_color, fog_type, cloud_full_radius * 0.5,
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cloud_full_radius*1.2, fog_density, fog_pixelfog, fog_rangefog);
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// Read noise
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const int grid_length = 2 * m_cloud_radius_i;
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std::vector<bool> grid(grid_length * grid_length);
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auto grid_index = [&] (int x, int z) -> int {
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return (z + m_cloud_radius_i) * grid_length + (x + m_cloud_radius_i);
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};
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auto grid_point = [&] (int x, int z) -> bool {
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return grid[grid_index(x, z)];
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};
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float cloud_size_noise = cloud_size / BS / 200;
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for(s16 zi = -m_cloud_radius_i; zi < m_cloud_radius_i; zi++) {
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u32 si = (zi + m_cloud_radius_i) * m_cloud_radius_i * 2 + m_cloud_radius_i;
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for (s16 xi = -m_cloud_radius_i; xi < m_cloud_radius_i; xi++) {
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u32 i = si + xi;
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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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float noise = noise2d_perlin(
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(float)p_in_noise_i.X * cloud_size_noise,
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(float)p_in_noise_i.Y * cloud_size_noise,
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m_seed, 3, 0.5);
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// normalize to 0..1 (given 3 octaves)
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static const float noise_bound = 1.0f + 0.5f + 0.25f;
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float density = noise / noise_bound * 0.5f + 0.5f;
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grid[i] = (density < m_params.density);
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}
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}
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const float camera_y = m_camera_pos.Y;
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const float rel_y = camera_y - m_params.height * BS;
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const bool draw_top = !m_enable_3d || rel_y >= m_params.thickness * BS;
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const bool draw_bottom = rel_y < 0.0f;
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const v3f origin = v3f(world_center_of_drawing_in_noise_f.X, m_params.height * BS, world_center_of_drawing_in_noise_f.Y) - intToFloat(m_camera_offset, BS);
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const f32 rx = cloud_size;
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// if clouds are flat, the top layer should be at the given height
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const f32 ry = m_enable_3d ? m_params.thickness * BS : 0.0f;
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const f32 rz = cloud_size;
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// std::vector is great but it is slow
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// reserve+push/insert is slow because extending needs to check vector size
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// resize+direct access is slow because resize initializes the whole vector
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// so... malloc! it can't overflow as there can't be more than 6 quads per grid cell
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video::S3DVertex *buf = (video::S3DVertex *)malloc(grid.size() * num_faces_to_draw * 4 * sizeof(video::S3DVertex));
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video::S3DVertex *pv = buf;
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const v3f faces[6][4] = {
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{{0, ry, 0}, {0, ry, rz}, {rx, ry, rz}, {rx, ry, 0}}, // top
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{{0, ry, 0}, {rx, ry, 0}, {rx, 0, 0}, {0, 0, 0}}, // back
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{{rx, ry, 0}, {rx, ry, rz}, {rx, 0, rz}, {rx, 0, 0}}, // right
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{{rx, ry, rz}, {0, ry, rz}, {0, 0, rz}, {rx, 0, rz}}, // front
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{{0, ry, rz}, {0, ry, 0}, {0, 0, 0}, {0, 0, rz}}, // left
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{{rx, 0, rz}, {0, 0, rz}, {0, 0, 0}, {rx, 0, 0}}, // bottom
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};
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const v3f normals[6] = {{0, 1, 0}, {0, 0, -1}, {1, 0, 0}, {0, 0, 1}, {-1, 0, 0}, {0, -1, 0}};
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const video::SColor colors[6] = {c_top, c_side_1, c_side_2, c_side_1, c_side_2, c_bottom};
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const v2f tex_coords[4] = {{0, 1}, {1, 1}, {1, 0}, {0, 0}};
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// Draw from back to front for proper transparency
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for (s16 zi0= 1-(int)m_cloud_radius_i; zi0 < m_cloud_radius_i-1; zi0++)
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for (s16 xi0= 1-(int)m_cloud_radius_i; xi0 < m_cloud_radius_i-1; xi0++)
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{
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s16 zi = zi0;
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s16 xi = xi0;
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if (zi >= 0)
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zi = m_cloud_radius_i - zi - 2;
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if (xi >= 0)
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xi = m_cloud_radius_i - xi - 2;
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if (!grid_point(xi, zi))
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continue;
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bool do_draw[6] = {
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draw_top,
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zi > 0 && !grid_point(xi, zi - 1),
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xi < 0 && !grid_point(xi + 1, zi),
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zi < 0 && !grid_point(xi, zi + 1),
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xi > 0 && !grid_point(xi - 1, zi),
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draw_bottom,
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};
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v3f const pos = origin + v3f(xi, 0.0f, zi) * cloud_size;
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for (int i = 0; i < num_faces_to_draw; i++) {
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if (!do_draw[i])
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continue;
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for (int k = 0; k < 4; k++) {
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pv->Pos = pos + faces[i][k];
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pv->Normal = normals[i];
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pv->Color = colors[i];
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pv->TCoords = tex_coords[k];
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pv++;
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}
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}
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}
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int vertex_count = pv - buf;
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int quad_count = vertex_count / 4;
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driver->drawVertexPrimitiveList(buf, vertex_count, quad_indices.data(), 2 * quad_count,
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video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
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free(buf);
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// Restore fog settings
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driver->setFog(fog_color, fog_type, fog_start, fog_end, fog_density,
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fog_pixelfog, fog_rangefog);
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}
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void Clouds::step(float dtime)
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{
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m_origin = m_origin + dtime * BS * m_params.speed;
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}
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void Clouds::update(v3f camera_p, video::SColorf color_diffuse)
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{
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m_camera_pos = camera_p;
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m_color.r = MYMIN(MYMAX(color_diffuse.r * m_params.color_bright.getRed(),
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m_params.color_ambient.getRed()), 255) / 255.0f;
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m_color.g = MYMIN(MYMAX(color_diffuse.g * m_params.color_bright.getGreen(),
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m_params.color_ambient.getGreen()), 255) / 255.0f;
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m_color.b = MYMIN(MYMAX(color_diffuse.b * m_params.color_bright.getBlue(),
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m_params.color_ambient.getBlue()), 255) / 255.0f;
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m_color.a = m_params.color_bright.getAlpha() / 255.0f;
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}
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void Clouds::readSettings()
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{
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m_params.height = (m_passed_cloud_y ? m_passed_cloud_y :
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g_settings->getS16("cloud_height"));
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m_cloud_radius_i = g_settings->getU16("cloud_radius");
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m_enable_3d = g_settings->getBool("enable_3d_clouds");
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}
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