minetest/src/clouds.cpp

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/*
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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
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
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(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 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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "clouds.h"
#include "noise.h"
#include "constants.h"
#include "debug.h"
#include "profiler.h"
#include "settings.h"
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// Menu clouds are created later
class Clouds;
Clouds *g_menuclouds = NULL;
irr::scene::ISceneManager *g_menucloudsmgr = NULL;
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Clouds::Clouds(
scene::ISceneNode* parent,
scene::ISceneManager* mgr,
s32 id,
u32 seed,
s16 cloudheight
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):
scene::ISceneNode(parent, mgr, id),
m_seed(seed),
m_camera_pos(0,0),
m_time(0),
m_camera_offset(0,0,0)
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{
m_material.setFlag(video::EMF_LIGHTING, false);
//m_material.setFlag(video::EMF_BACK_FACE_CULLING, false);
m_material.setFlag(video::EMF_BACK_FACE_CULLING, true);
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m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
m_material.setFlag(video::EMF_FOG_ENABLE, true);
m_material.setFlag(video::EMF_ANTI_ALIASING, true);
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//m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
m_material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
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m_cloud_y = BS * (cloudheight ? cloudheight :
g_settings->getS16("cloud_height"));
m_cloud_radius_i = g_settings->getU16("cloud_radius");
m_enable_3d = g_settings->getBool("enable_3d_clouds");
m_box = core::aabbox3d<f32>(-BS*1000000,m_cloud_y-BS,-BS*1000000,
BS*1000000,m_cloud_y+BS,BS*1000000);
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}
Clouds::~Clouds()
{
}
void Clouds::OnRegisterSceneNode()
{
if(IsVisible)
{
SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
//SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
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}
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)
//if(SceneManager->getSceneNodeRenderPass() != scene::ESNRP_SOLID)
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return;
ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
int num_faces_to_draw = m_enable_3d ? 6 : 1;
m_material.setFlag(video::EMF_BACK_FACE_CULLING, m_enable_3d);
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driver->setTransform(video::ETS_WORLD, AbsoluteTransformation);
driver->setMaterial(m_material);
/*
Clouds move from Z+ towards Z-
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*/
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const float cloud_size = BS * 64;
const v2f cloud_speed(0, -BS * 2);
const float cloud_full_radius = cloud_size * m_cloud_radius_i;
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// Position of cloud noise origin in world coordinates
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v2f world_cloud_origin_pos_f = m_time * cloud_speed;
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// 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;
/*video::SColor c_top(128,b*240,b*240,b*255);
video::SColor c_side_1(128,b*230,b*230,b*255);
video::SColor c_side_2(128,b*220,b*220,b*245);
video::SColor c_bottom(128,b*205,b*205,b*230);*/
video::SColorf c_top_f(m_color);
video::SColorf c_side_1_f(m_color);
video::SColorf c_side_2_f(m_color);
video::SColorf c_bottom_f(m_color);
c_side_1_f.r *= 0.95;
c_side_1_f.g *= 0.95;
c_side_1_f.b *= 0.95;
c_side_2_f.r *= 0.90;
c_side_2_f.g *= 0.90;
c_side_2_f.b *= 0.90;
c_bottom_f.r *= 0.80;
c_bottom_f.g *= 0.80;
c_bottom_f.b *= 0.80;
c_top_f.a = 0.9;
c_side_1_f.a = 0.9;
c_side_2_f.a = 0.9;
c_bottom_f.a = 0.9;
video::SColor c_top = c_top_f.toSColor();
video::SColor c_side_1 = c_side_1_f.toSColor();
video::SColor c_side_2 = c_side_2_f.toSColor();
video::SColor c_bottom = c_bottom_f.toSColor();
// Get fog parameters for setting them back later
video::SColor fog_color(0,0,0,0);
video::E_FOG_TYPE fog_type = video::EFT_FOG_LINEAR;
f32 fog_start = 0;
f32 fog_end = 0;
f32 fog_density = 0;
bool fog_pixelfog = false;
bool fog_rangefog = false;
driver->getFog(fog_color, fog_type, fog_start, fog_end, fog_density,
fog_pixelfog, fog_rangefog);
// Set our own fog
driver->setFog(fog_color, fog_type, cloud_full_radius * 0.5,
cloud_full_radius*1.2, fog_density, fog_pixelfog, fog_rangefog);
// Read noise
bool *grid = new bool[m_cloud_radius_i * 2 * m_cloud_radius_i * 2];
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float cloud_size_noise = cloud_size / BS / 200;
for(s16 zi = -m_cloud_radius_i; zi < m_cloud_radius_i; zi++) {
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;
v2s16 p_in_noise_i(
xi + center_of_drawing_in_noise_i.X,
zi + center_of_drawing_in_noise_i.Y
);
double noise = noise2d_perlin(
(float)p_in_noise_i.X * cloud_size_noise,
(float)p_in_noise_i.Y * cloud_size_noise,
m_seed, 3, 0.5);
grid[i] = (noise >= 0.4);
}
}
#define GETINDEX(x, z, radius) (((z)+(radius))*(radius)*2 + (x)+(radius))
#define INAREA(x, z, radius) \
((x) >= -(radius) && (x) < (radius) && (z) >= -(radius) && (z) < (radius))
for (s16 zi0= -m_cloud_radius_i; zi0 < m_cloud_radius_i; zi0++)
for (s16 xi0= -m_cloud_radius_i; xi0 < m_cloud_radius_i; xi0++)
{
s16 zi = zi0;
s16 xi = xi0;
// Draw from front to back (needed for transparency)
/*if(zi <= 0)
zi = -m_cloud_radius_i - zi;
if(xi <= 0)
xi = -m_cloud_radius_i - xi;*/
// Draw from back to front
if(zi >= 0)
zi = m_cloud_radius_i - zi - 1;
if(xi >= 0)
xi = m_cloud_radius_i - xi - 1;
u32 i = GETINDEX(xi, zi, m_cloud_radius_i);
if(grid[i] == false)
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continue;
v2f p0 = v2f(xi,zi)*cloud_size + world_center_of_drawing_in_noise_f;
video::S3DVertex v[4] = {
video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 1),
video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 1),
video::S3DVertex(0,0,0, 0,0,0, c_top, 1, 0),
video::S3DVertex(0,0,0, 0,0,0, c_top, 0, 0)
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};
/*if(zi <= 0 && xi <= 0){
v[0].Color.setBlue(255);
v[1].Color.setBlue(255);
v[2].Color.setBlue(255);
v[3].Color.setBlue(255);
}*/
f32 rx = cloud_size/2;
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f32 ry = 8 * BS;
f32 rz = cloud_size / 2;
for(int i=0; i<num_faces_to_draw; i++)
{
switch(i)
{
case 0: // top
for(int j=0;j<4;j++){
v[j].Normal.set(0,1,0);
}
v[0].Pos.set(-rx, ry,-rz);
v[1].Pos.set(-rx, ry, rz);
v[2].Pos.set( rx, ry, rz);
v[3].Pos.set( rx, ry,-rz);
break;
case 1: // back
if (INAREA(xi, zi - 1, m_cloud_radius_i)) {
u32 j = GETINDEX(xi, zi - 1, m_cloud_radius_i);
if(grid[j])
continue;
}
for(int j=0;j<4;j++){
v[j].Color = c_side_1;
v[j].Normal.set(0,0,-1);
}
v[0].Pos.set(-rx, ry,-rz);
v[1].Pos.set( rx, ry,-rz);
v[2].Pos.set( rx,-ry,-rz);
v[3].Pos.set(-rx,-ry,-rz);
break;
case 2: //right
if (INAREA(xi + 1, zi, m_cloud_radius_i)) {
u32 j = GETINDEX(xi+1, zi, m_cloud_radius_i);
if(grid[j])
continue;
}
for(int j=0;j<4;j++){
v[j].Color = c_side_2;
v[j].Normal.set(1,0,0);
}
v[0].Pos.set( rx, ry,-rz);
v[1].Pos.set( rx, ry, rz);
v[2].Pos.set( rx,-ry, rz);
v[3].Pos.set( rx,-ry,-rz);
break;
case 3: // front
if (INAREA(xi, zi + 1, m_cloud_radius_i)) {
u32 j = GETINDEX(xi, zi + 1, m_cloud_radius_i);
if(grid[j])
continue;
}
for(int j=0;j<4;j++){
v[j].Color = c_side_1;
v[j].Normal.set(0,0,-1);
}
v[0].Pos.set( rx, ry, rz);
v[1].Pos.set(-rx, ry, rz);
v[2].Pos.set(-rx,-ry, rz);
v[3].Pos.set( rx,-ry, rz);
break;
case 4: // left
if (INAREA(xi-1, zi, m_cloud_radius_i)) {
u32 j = GETINDEX(xi-1, zi, m_cloud_radius_i);
if(grid[j])
continue;
}
for(int j=0;j<4;j++){
v[j].Color = c_side_2;
v[j].Normal.set(-1,0,0);
}
v[0].Pos.set(-rx, ry, rz);
v[1].Pos.set(-rx, ry,-rz);
v[2].Pos.set(-rx,-ry,-rz);
v[3].Pos.set(-rx,-ry, rz);
break;
case 5: // bottom
for(int j=0;j<4;j++){
v[j].Color = c_bottom;
v[j].Normal.set(0,-1,0);
}
v[0].Pos.set( rx,-ry, rz);
v[1].Pos.set(-rx,-ry, rz);
v[2].Pos.set(-rx,-ry,-rz);
v[3].Pos.set( rx,-ry,-rz);
break;
}
v3f pos(p0.X, m_cloud_y, p0.Y);
pos -= intToFloat(m_camera_offset, BS);
for(u16 i=0; i<4; i++)
v[i].Pos += pos;
u16 indices[] = {0,1,2,2,3,0};
driver->drawVertexPrimitiveList(v, 4, indices, 2,
video::EVT_STANDARD, scene::EPT_TRIANGLES, video::EIT_16BIT);
}
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}
delete[] grid;
// Restore fog settings
driver->setFog(fog_color, fog_type, fog_start, fog_end, fog_density,
fog_pixelfog, fog_rangefog);
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}
void Clouds::step(float dtime)
{
m_time += dtime;
}
void Clouds::update(v2f camera_p, video::SColorf color)
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{
m_camera_pos = camera_p;
m_color = color;
//m_brightness = brightness;
//dstream<<"m_brightness="<<m_brightness<<std::endl;
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}