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minetest/src/clouds.cpp
Perttu Ahola 2e90ed07ac Dynamic sky, fog and cloud colors; sun and moon
2012-03-18 13:42:18 +02:00

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/*
Minetest-c55
Copyright (C) 2010-2011 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"
#include "main.h" // For g_profiler and g_settings
#include "profiler.h"
#include "settings.h"
Clouds::Clouds(
scene::ISceneNode* parent,
scene::ISceneManager* mgr,
s32 id,
u32 seed
):
scene::ISceneNode(parent, mgr, id),
m_seed(seed),
m_camera_pos(0,0),
m_time(0)
{
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);
m_material.setFlag(video::EMF_BILINEAR_FILTER, false);
m_material.setFlag(video::EMF_FOG_ENABLE, true);
m_material.setFlag(video::EMF_ANTI_ALIASING, true);
//m_material.MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
m_material.MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
m_cloud_y = BS*100;
//m_cloud_y = BS*50;
m_box = core::aabbox3d<f32>(-BS*1000000,m_cloud_y-BS,-BS*1000000,
BS*1000000,m_cloud_y+BS,BS*1000000);
}
Clouds::~Clouds()
{
}
void Clouds::OnRegisterSceneNode()
{
if(IsVisible)
{
SceneManager->registerNodeForRendering(this, scene::ESNRP_TRANSPARENT);
//SceneManager->registerNodeForRendering(this, scene::ESNRP_SOLID);
}
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)
return;
ScopeProfiler sp(g_profiler, "Rendering of clouds, avg", SPT_AVG);
bool enable_3d = g_settings->getBool("enable_3d_clouds");
int num_faces_to_draw = enable_3d ? 6 : 1;
m_material.setFlag(video::EMF_BACK_FACE_CULLING, enable_3d);
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*64;
const v2f cloud_speed(0, -BS*2);
const float cloud_full_radius = cloud_size * cloud_radius_i;
// 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;
/*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[cloud_radius_i*2*cloud_radius_i*2];
for(s16 zi=-cloud_radius_i; zi<cloud_radius_i; zi++)
for(s16 xi=-cloud_radius_i; xi<cloud_radius_i; xi++)
{
u32 i = (zi+cloud_radius_i)*cloud_radius_i*2 + xi+cloud_radius_i;
v2s16 p_in_noise_i(
xi+center_of_drawing_in_noise_i.X,
zi+center_of_drawing_in_noise_i.Y
);
#if 0
double noise = noise2d_perlin_abs(
(float)p_in_noise_i.X*cloud_size/BS/200,
(float)p_in_noise_i.Y*cloud_size/BS/200,
m_seed, 3, 0.4);
grid[i] = (noise >= 0.80);
#endif
#if 1
double noise = noise2d_perlin(
(float)p_in_noise_i.X*cloud_size/BS/200,
(float)p_in_noise_i.Y*cloud_size/BS/200,
m_seed, 3, 0.5);
grid[i] = (noise >= 0.4);
#endif
}
#define GETINDEX(x, z, radius) (((z)+(radius))*(radius)*2 + (x)+(radius))
#define CONTAINS(x, z, radius) \
((x) >= -(radius) && (x) < (radius) && (z) >= -(radius) && (z) < (radius))
for(s16 zi0=-cloud_radius_i; zi0<cloud_radius_i; zi0++)
for(s16 xi0=-cloud_radius_i; xi0<cloud_radius_i; xi0++)
{
s16 zi = zi0;
s16 xi = xi0;
// Draw from front to back (needed for transparency)
/*if(zi <= 0)
zi = -cloud_radius_i - zi;
if(xi <= 0)
xi = -cloud_radius_i - xi;*/
// Draw from back to front
if(zi >= 0)
zi = cloud_radius_i - zi - 1;
if(xi >= 0)
xi = cloud_radius_i - xi - 1;
u32 i = GETINDEX(xi, zi, cloud_radius_i);
if(grid[i] == false)
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)
};
/*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;
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 = v3f(0,1,0);
}
v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
v[2].Pos.X= rx; v[2].Pos.Y= ry; v[2].Pos.Z= rz;
v[3].Pos.X= rx; v[3].Pos.Y= ry, v[3].Pos.Z=-rz;
break;
case 1: // back
if(CONTAINS(xi, zi-1, cloud_radius_i)){
u32 j = GETINDEX(xi, zi-1, cloud_radius_i);
if(grid[j])
continue;
}
for(int j=0;j<4;j++){
v[j].Color=c_side_1;
v[j].Normal = v3f(0,0,-1);
}
v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
v[1].Pos.X= rx; v[1].Pos.Y= ry; v[1].Pos.Z=-rz;
v[2].Pos.X= rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
v[3].Pos.X=-rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
break;
case 2: //right
if(CONTAINS(xi+1, zi, cloud_radius_i)){
u32 j = GETINDEX(xi+1, zi, cloud_radius_i);
if(grid[j])
continue;
}
for(int j=0;j<4;j++){
v[j].Color=c_side_2;
v[j].Normal = v3f(1,0,0);
}
v[0].Pos.X= rx; v[0].Pos.Y= ry; v[0].Pos.Z=-rz;
v[1].Pos.X= rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
v[2].Pos.X= rx; v[2].Pos.Y=-ry; v[2].Pos.Z= rz;
v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
break;
case 3: // front
if(CONTAINS(xi, zi+1, cloud_radius_i)){
u32 j = GETINDEX(xi, zi+1, cloud_radius_i);
if(grid[j])
continue;
}
for(int j=0;j<4;j++){
v[j].Color=c_side_1;
v[j].Normal = v3f(0,0,-1);
}
v[0].Pos.X= rx; v[0].Pos.Y= ry; v[0].Pos.Z= rz;
v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z= rz;
v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z= rz;
v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z= rz;
break;
case 4: // left
if(CONTAINS(xi-1, zi, cloud_radius_i)){
u32 j = GETINDEX(xi-1, zi, cloud_radius_i);
if(grid[j])
continue;
}
for(int j=0;j<4;j++){
v[j].Color=c_side_2;
v[j].Normal = v3f(-1,0,0);
}
v[0].Pos.X=-rx; v[0].Pos.Y= ry; v[0].Pos.Z= rz;
v[1].Pos.X=-rx; v[1].Pos.Y= ry; v[1].Pos.Z=-rz;
v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
v[3].Pos.X=-rx; v[3].Pos.Y=-ry, v[3].Pos.Z= rz;
break;
case 5: // bottom
for(int j=0;j<4;j++){
v[j].Color=c_bottom;
v[j].Normal = v3f(0,-1,0);
}
v[0].Pos.X= rx; v[0].Pos.Y=-ry; v[0].Pos.Z= rz;
v[1].Pos.X=-rx; v[1].Pos.Y=-ry; v[1].Pos.Z= rz;
v[2].Pos.X=-rx; v[2].Pos.Y=-ry; v[2].Pos.Z=-rz;
v[3].Pos.X= rx; v[3].Pos.Y=-ry, v[3].Pos.Z=-rz;
break;
}
v3f pos = v3f(p0.X,m_cloud_y,p0.Y);
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);
}
}
delete[] grid;
// Restore fog settings
driver->setFog(fog_color, fog_type, fog_start, fog_end, fog_density,
fog_pixelfog, fog_rangefog);
}
void Clouds::step(float dtime)
{
m_time += dtime;
}
void Clouds::update(v2f camera_p, video::SColorf color)
{
m_camera_pos = camera_p;
m_color = color;
//m_brightness = brightness;
//dstream<<"m_brightness="<<m_brightness<<std::endl;
}
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