From 2e90ed07acd295387c0da6c0689d14665b6c125d Mon Sep 17 00:00:00 2001
From: Perttu Ahola <celeron55@gmail.com>
Date: Fri, 16 Mar 2012 16:34:30 +0200
Subject: Dynamic sky, fog and cloud colors; sun and moon

---
 src/sky.cpp | 446 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 446 insertions(+)
 create mode 100644 src/sky.cpp

(limited to 'src/sky.cpp')

diff --git a/src/sky.cpp b/src/sky.cpp
new file mode 100644
index 000000000..ba9b17493
--- /dev/null
+++ b/src/sky.cpp
@@ -0,0 +1,446 @@
+#include "sky.h"
+#include "IVideoDriver.h"
+#include "ISceneManager.h"
+#include "ICameraSceneNode.h"
+#include "S3DVertex.h"
+#include "utility.h" // MYMIN
+#include "tile.h" // getTexturePath
+#include "noise.h" // easeCurve
+#include "main.h" // g_profiler
+#include "profiler.h"
+
+//! constructor
+Sky::Sky(scene::ISceneNode* parent, scene::ISceneManager* mgr, s32 id):
+		scene::ISceneNode(parent, mgr, id),
+		m_first_update(true),
+		m_brightness(0.5),
+		m_cloud_brightness(0.5),
+		m_bgcolor_bright_f(1,1,1,1),
+		m_skycolor_bright_f(1,1,1,1),
+		m_cloudcolor_bright_f(1,1,1,1)
+{
+	setAutomaticCulling(scene::EAC_OFF);
+	Box.MaxEdge.set(0,0,0);
+	Box.MinEdge.set(0,0,0);
+
+	// create material
+
+	video::SMaterial mat;
+	mat.Lighting = false;
+	mat.ZBuffer = video::ECFN_NEVER;
+	mat.ZWriteEnable = false;
+	mat.AntiAliasing=0;
+	mat.TextureLayer[0].TextureWrapU = video::ETC_CLAMP_TO_EDGE;
+	mat.TextureLayer[0].TextureWrapV = video::ETC_CLAMP_TO_EDGE;
+	mat.BackfaceCulling = false;
+
+	m_materials[0] = mat;
+
+	m_materials[1] = mat;
+	//m_materials[1].MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
+	m_materials[1].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
+
+	m_materials[2] = mat;
+	m_materials[2].setTexture(0, mgr->getVideoDriver()->getTexture(
+			getTexturePath("sunrisebg.png").c_str()));
+	m_materials[2].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
+	//m_materials[2].MaterialType = video::EMT_TRANSPARENT_ADD_COLOR;
+
+	for(u32 i=0; i<SKY_STAR_COUNT; i++){
+		m_stars[i] = v3f(
+			myrand_range(-10000,10000),
+			myrand_range(-10000,10000),
+			myrand_range(-10000,10000)
+		);
+		m_stars[i].normalize();
+	}
+}
+
+void Sky::OnRegisterSceneNode()
+{
+	if (IsVisible)
+		SceneManager->registerNodeForRendering(this, scene::ESNRP_SKY_BOX);
+
+	scene::ISceneNode::OnRegisterSceneNode();
+}
+
+const core::aabbox3d<f32>& Sky::getBoundingBox() const
+{
+	return Box;
+}
+
+//! renders the node.
+void Sky::render()
+{
+	video::IVideoDriver* driver = SceneManager->getVideoDriver();
+	scene::ICameraSceneNode* camera = SceneManager->getActiveCamera();
+
+	if (!camera || !driver)
+		return;
+	
+	ScopeProfiler sp(g_profiler, "Sky::render()", SPT_AVG);
+
+	// draw perspective skybox
+
+	core::matrix4 translate(AbsoluteTransformation);
+	translate.setTranslation(camera->getAbsolutePosition());
+
+	// Draw the sky box between the near and far clip plane
+	const f32 viewDistance = (camera->getNearValue() + camera->getFarValue()) * 0.5f;
+	core::matrix4 scale;
+	scale.setScale(core::vector3df(viewDistance, viewDistance, viewDistance));
+
+	driver->setTransform(video::ETS_WORLD, translate * scale);
+	
+	if(m_sunlight_seen)
+	{
+		float sunsize = 0.07;
+		video::SColorf suncolor_f(1, 1, 0, 1);
+		suncolor_f.r = 1;
+		suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.7+m_time_brightness*(0.5)));
+		suncolor_f.b = MYMAX(0.0, m_brightness*0.95);
+		video::SColorf suncolor2_f(1, 1, 1, 1);
+		suncolor_f.r = 1;
+		suncolor_f.g = MYMAX(0.3, MYMIN(1.0, 0.85+m_time_brightness*(0.5)));
+		suncolor_f.b = MYMAX(0.0, m_brightness);
+
+		float moonsize = 0.04;
+		video::SColorf mooncolor_f(0.50, 0.57, 0.65, 1);
+		video::SColorf mooncolor2_f(0.85, 0.875, 0.9, 1);
+		
+		float nightlength = 0.41;
+		float wn = nightlength / 2;
+		float wicked_time_of_day = 0;
+		if(m_time_of_day > wn && m_time_of_day < 1.0 - wn)
+			wicked_time_of_day = (m_time_of_day - wn)/(1.0-wn*2)*0.5 + 0.25;
+		else if(m_time_of_day < 0.5)
+			wicked_time_of_day = m_time_of_day / wn * 0.25;
+		else
+			wicked_time_of_day = 1.0 - ((1.0-m_time_of_day) / wn * 0.25);
+		/*std::cerr<<"time_of_day="<<m_time_of_day<<" -> "
+				<<"wicked_time_of_day="<<wicked_time_of_day<<std::endl;*/
+
+		video::SColor suncolor = suncolor_f.toSColor();
+		video::SColor suncolor2 = suncolor2_f.toSColor();
+		video::SColor mooncolor = mooncolor_f.toSColor();
+		video::SColor mooncolor2 = mooncolor2_f.toSColor();
+
+		const f32 t = 1.0f;
+		const f32 o = 0.0f;
+		static const u16 indices[4] = {0,1,2,3};
+		video::S3DVertex vertices[4];
+
+		driver->setMaterial(m_materials[2]);
+		{
+			float mid1 = 0.25;
+			float mid = (wicked_time_of_day < 0.5 ? mid1 : (1.0 - mid1));
+			float a_ = 1.0 - fabs(wicked_time_of_day - mid) * 35.0;
+			float a = easeCurve(MYMAX(0, MYMIN(1, a_)));
+			//std::cerr<<"a_="<<a_<<" a="<<a<<std::endl;
+			video::SColor c(255,255,255,255);
+			float y = -(1.0 - a) * 0.2;
+			vertices[0] = video::S3DVertex(-1,-0.05+y,-1, 0,0,1, c, t, t);
+			vertices[1] = video::S3DVertex( 1,-0.05+y,-1, 0,0,1, c, o, t);
+			vertices[2] = video::S3DVertex( 1, 0.2+y,-1, 0,0,1, c, o, o);
+			vertices[3] = video::S3DVertex(-1, 0.2+y,-1, 0,0,1, c, t, o);
+			for(u32 i=0; i<4; i++){
+				if(wicked_time_of_day < 0.5)
+					// Switch from -Z (south) to +X (east)
+					vertices[i].Pos.rotateXZBy(90);
+				else
+					// Switch from -Z (south) to -X (west)
+					vertices[i].Pos.rotateXZBy(-90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+		}
+
+		driver->setMaterial(m_materials[1]);
+		
+		// Draw sun
+		if(wicked_time_of_day > 0.15 && wicked_time_of_day < 0.85)
+		{
+			float d = sunsize * 1.7;
+			video::SColor c = suncolor;
+			c.setAlpha(0.05*255);
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, c, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, c, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, c, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, c, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to +X (east)
+				vertices[i].Pos.rotateXZBy(90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+
+			d = sunsize * 1.2;
+			c = suncolor;
+			c.setAlpha(0.15*255);
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, c, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, c, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, c, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, c, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to +X (east)
+				vertices[i].Pos.rotateXZBy(90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+
+			d = sunsize;
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, suncolor, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, suncolor, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, suncolor, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, suncolor, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to +X (east)
+				vertices[i].Pos.rotateXZBy(90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+
+			d = sunsize * 0.7;
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, suncolor2, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, suncolor2, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, suncolor2, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, suncolor2, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to +X (east)
+				vertices[i].Pos.rotateXZBy(90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+		}
+		// Draw moon
+		if(wicked_time_of_day < 0.3 || wicked_time_of_day > 0.7)
+		{
+			float d = moonsize * 1.9;
+			video::SColor c = mooncolor;
+			c.setAlpha(0.05*255);
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, c, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, c, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, c, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, c, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to -X (west)
+				vertices[i].Pos.rotateXZBy(-90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+			
+			d = moonsize * 1.3;
+			c = mooncolor;
+			c.setAlpha(0.15*255);
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, c, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, c, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, c, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, c, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to -X (west)
+				vertices[i].Pos.rotateXZBy(-90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+			
+			d = moonsize;
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, mooncolor, t, t);
+			vertices[1] = video::S3DVertex( d,-d,-1, 0,0,1, mooncolor, o, t);
+			vertices[2] = video::S3DVertex( d, d,-1, 0,0,1, mooncolor, o, o);
+			vertices[3] = video::S3DVertex(-d, d,-1, 0,0,1, mooncolor, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to -X (west)
+				vertices[i].Pos.rotateXZBy(-90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+			
+			float d2 = moonsize * 0.6;
+			vertices[0] = video::S3DVertex(-d,-d,-1, 0,0,1, mooncolor2, t, t);
+			vertices[1] = video::S3DVertex( d2,-d,-1, 0,0,1, mooncolor2, o, t);
+			vertices[2] = video::S3DVertex( d2, d2,-1, 0,0,1, mooncolor2, o, o);
+			vertices[3] = video::S3DVertex(-d, d2,-1, 0,0,1, mooncolor2, t, o);
+			for(u32 i=0; i<4; i++){
+				// Switch from -Z (south) to -X (west)
+				vertices[i].Pos.rotateXZBy(-90);
+				vertices[i].Pos.rotateXYBy(wicked_time_of_day * 360 - 90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+		}
+		// Stars
+		do{
+			float starbrightness = MYMAX(0, MYMIN(1,
+					(0.285 - fabs(wicked_time_of_day < 0.5 ?
+					wicked_time_of_day : (1.0 - wicked_time_of_day))) * 10));
+			float f = starbrightness;
+			video::SColor starcolor(255, f*120,f*120,f*120);
+			if(starcolor.getBlue() < m_skycolor.getBlue())
+				break;
+			u16 indices[SKY_STAR_COUNT*4];
+			video::S3DVertex vertices[SKY_STAR_COUNT*4];
+			for(u32 i=0; i<SKY_STAR_COUNT; i++){
+				indices[i*4+0] = i*4+0;
+				indices[i*4+1] = i*4+1;
+				indices[i*4+2] = i*4+2;
+				indices[i*4+3] = i*4+3;
+				v3f p = m_stars[i];
+				core::CMatrix4<f32> a;
+				float d = 0.005;
+				a.buildRotateFromTo(v3f(0,1,0), v3f(d,1,0));
+				v3f p1 = p;
+				a.rotateVect(p1);
+				a.buildRotateFromTo(v3f(0,1,0), v3f(d,1+d/2,d));
+				v3f p2 = p;
+				a.rotateVect(p2);
+				a.buildRotateFromTo(v3f(0,1,0), v3f(0,1,d));
+				v3f p3 = p;
+				a.rotateVect(p3);
+				p.rotateXYBy(wicked_time_of_day * 360 - 90);
+				p1.rotateXYBy(wicked_time_of_day * 360 - 90);
+				p2.rotateXYBy(wicked_time_of_day * 360 - 90);
+				p3.rotateXYBy(wicked_time_of_day * 360 - 90);
+				vertices[i*4+0].Pos = p;
+				vertices[i*4+0].Color = starcolor;
+				vertices[i*4+1].Pos = p1;
+				vertices[i*4+1].Color = starcolor;
+				vertices[i*4+2].Pos = p2;
+				vertices[i*4+2].Color = starcolor;
+				vertices[i*4+3].Pos = p3;
+				vertices[i*4+3].Color = starcolor;
+			}
+			driver->drawVertexPrimitiveList(vertices, SKY_STAR_COUNT*4,
+					indices, SKY_STAR_COUNT, video::EVT_STANDARD,
+					scene::EPT_QUADS, video::EIT_16BIT);
+		}while(0);
+		
+		for(u32 j=0; j<2; j++)
+		{
+			vertices[0] = video::S3DVertex(-1,-1.0,-1, 0,0,1, m_skycolor, t, t);
+			vertices[1] = video::S3DVertex( 1,-1.0,-1, 0,0,1, m_skycolor, o, t);
+			vertices[2] = video::S3DVertex( 1,-0.02,-1, 0,0,1, m_skycolor, o, o);
+			vertices[3] = video::S3DVertex(-1,-0.02,-1, 0,0,1, m_skycolor, t, o);
+			for(u32 i=0; i<4; i++){
+				//if(wicked_time_of_day < 0.5)
+				if(j==0)
+					// Switch from -Z (south) to +X (east)
+					vertices[i].Pos.rotateXZBy(90);
+				else
+					// Switch from -Z (south) to -X (west)
+					vertices[i].Pos.rotateXZBy(-90);
+			}
+			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+		}
+	}
+}
+
+void Sky::update(float time_of_day, float time_brightness,
+		float direct_brightness, bool sunlight_seen)
+{
+	// Stabilize initial brightness and color values by flooding updates
+	if(m_first_update){
+		/*dstream<<"First update with time_of_day="<<time_of_day
+				<<" time_brightness="<<time_brightness
+				<<" direct_brightness="<<direct_brightness
+				<<" sunlight_seen="<<sunlight_seen<<std::endl;*/
+		m_first_update = false;
+		for(u32 i=0; i<100; i++){
+			update(time_of_day, time_brightness, direct_brightness,
+					sunlight_seen);
+		}
+		return;
+	}
+
+	m_time_of_day = time_of_day;
+	m_time_brightness = time_brightness;
+	m_sunlight_seen = sunlight_seen;
+	
+	bool is_dawn = (time_brightness >= 0.20 && time_brightness < 0.50);
+
+	video::SColorf bgcolor_bright_normal_f(170./255,200./255,230./255, 1.0);
+	video::SColorf bgcolor_bright_indoor_f(100./255,100./255,100./255, 1.0);
+	//video::SColorf bgcolor_bright_dawn_f(0.666,200./255*0.7,230./255*0.5,1.0);
+	//video::SColorf bgcolor_bright_dawn_f(0.666,0.549,0.220,1.0);
+	//video::SColorf bgcolor_bright_dawn_f(0.666*1.2,0.549*1.0,0.220*1.0, 1.0);
+	video::SColorf bgcolor_bright_dawn_f(0.666*1.2,0.549*1.0,0.220*1.2,1.0);
+
+	video::SColorf skycolor_bright_normal_f =
+			video::SColor(255, 140, 186, 250);
+	video::SColorf skycolor_bright_dawn_f =
+			video::SColor(255, 180, 186, 250);
+	
+	video::SColorf cloudcolor_bright_normal_f =
+			video::SColor(255, 240,240,255);
+	//video::SColorf cloudcolor_bright_dawn_f(1.0, 0.591, 0.4);
+	//video::SColorf cloudcolor_bright_dawn_f(1.0, 0.65, 0.44);
+	video::SColorf cloudcolor_bright_dawn_f(1.0, 0.7, 0.5);
+
+	if(sunlight_seen){
+		//m_brightness = m_brightness * 0.95 + direct_brightness * 0.05;
+		m_brightness = m_brightness * 0.95 + time_brightness * 0.05;
+	}
+	else{
+		if(direct_brightness < m_brightness)
+			m_brightness = m_brightness * 0.95 + direct_brightness * 0.05;
+		else
+			m_brightness = m_brightness * 0.98 + direct_brightness * 0.02;
+	}
+	
+	m_clouds_visible = true;
+	float color_change_fraction = 0.98;
+	if(sunlight_seen){
+		if(is_dawn){
+			m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
+					bgcolor_bright_dawn_f, color_change_fraction);
+			m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
+					skycolor_bright_dawn_f, color_change_fraction);
+			m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
+					cloudcolor_bright_dawn_f, color_change_fraction);
+		} else {
+			m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
+					bgcolor_bright_normal_f, color_change_fraction);
+			m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
+					skycolor_bright_normal_f, color_change_fraction);
+			m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
+					cloudcolor_bright_normal_f, color_change_fraction);
+		}
+	} else {
+		m_bgcolor_bright_f = m_bgcolor_bright_f.getInterpolated(
+				bgcolor_bright_indoor_f, color_change_fraction);
+		m_cloudcolor_bright_f = m_cloudcolor_bright_f.getInterpolated(
+				cloudcolor_bright_normal_f, color_change_fraction);
+		m_skycolor_bright_f = m_skycolor_bright_f.getInterpolated(
+				bgcolor_bright_indoor_f, color_change_fraction);
+		m_clouds_visible = false;
+	}
+	video::SColor bgcolor_bright = m_bgcolor_bright_f.toSColor();
+	m_bgcolor = video::SColor(
+			255,
+			bgcolor_bright.getRed() * m_brightness,
+			bgcolor_bright.getGreen() * m_brightness,
+			bgcolor_bright.getBlue() * m_brightness);
+	
+	video::SColor skycolor_bright = m_skycolor_bright_f.toSColor();
+	m_skycolor = video::SColor(
+			255,
+			skycolor_bright.getRed() * m_brightness,
+			skycolor_bright.getGreen() * m_brightness,
+			skycolor_bright.getBlue() * m_brightness);
+	
+	float cloud_direct_brightness = 0;
+	if(sunlight_seen){
+		cloud_direct_brightness = time_brightness;
+		if(time_brightness >= 0.2 && time_brightness < 0.7)
+				cloud_direct_brightness *= 1.3;
+	} else {
+		cloud_direct_brightness = direct_brightness;
+	}
+	m_cloud_brightness = m_cloud_brightness * 0.95 +
+			cloud_direct_brightness * (1.0 - 0.95);
+	m_cloudcolor_f = video::SColorf(
+			m_cloudcolor_bright_f.getRed() * m_cloud_brightness,
+			m_cloudcolor_bright_f.getGreen() * m_cloud_brightness,
+			m_cloudcolor_bright_f.getBlue() * m_cloud_brightness,
+			1.0);
+
+}
+
+
-- 
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