Fast sky with stairs optimization

client/shaders/stars_shader/opengl_fragment.glsl

@@ -0,0 +1,6 @@
+uniform vec4 starColor;
+
+void main(void)
+{
+	gl_FragColor = starColor;
+}

client/shaders/stars_shader/opengl_vertex.glsl

@@ -0,0 +1,4 @@
+void main(void)
+{
+	gl_Position = mWorldViewProj * inVertexPosition;
+}

src/client/game.cpp

@@ -422,6 +422,7 @@ class GameGlobalShaderConstantSetter : public IShaderConstantSetter
 	CachedVertexShaderSetting<float> m_animation_timer_vertex;
 	CachedPixelShaderSetting<float> m_animation_timer_pixel;
 	CachedPixelShaderSetting<float, 3> m_day_light;
+	CachedPixelShaderSetting<float, 4> m_star_color;
 	CachedPixelShaderSetting<float, 3> m_eye_position_pixel;
 	CachedVertexShaderSetting<float, 3> m_eye_position_vertex;
 	CachedPixelShaderSetting<float, 3> m_minimap_yaw;
@@ -456,6 +457,7 @@ public:
 		m_animation_timer_vertex("animationTimer"),
 		m_animation_timer_pixel("animationTimer"),
 		m_day_light("dayLight"),
+		m_star_color("starColor"),
 		m_eye_position_pixel("eyePosition"),
 		m_eye_position_vertex("eyePosition"),
 		m_minimap_yaw("yawVec"),
@@ -509,6 +511,10 @@ public:
 			sunlight.b };
 		m_day_light.set(dnc, services);
 
+		video::SColorf star_color = m_sky->getCurrentStarColor();
+		float clr[4] = {star_color.r, star_color.g, star_color.b, star_color.a};
+		m_star_color.set(clr, services);
+
 		u32 animation_timer = porting::getTimeMs() % 1000000;
 		float animation_timer_f = (float)animation_timer / 100000.f;
 		m_animation_timer_vertex.set(&animation_timer_f, services);
@@ -1404,7 +1410,7 @@ bool Game::createClient(const std::string &playername,
 
 	/* Skybox
 	 */
-	sky = new Sky(-1, texture_src);
+	sky = new Sky(-1, texture_src, shader_src);
 	scsf->setSky(sky);
 	skybox = NULL;	// This is used/set later on in the main run loop
 

src/client/sky.cpp

@@ -1,6 +1,7 @@
 /*
 Minetest
 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
+Copyright (C) 2020 numzero, Lobachevskiy Vitaliy <numzer0@yandex.ru>
 
 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
@@ -34,16 +35,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "config.h"
 using namespace irr::core;
 
-Sky::Sky(s32 id, ITextureSource *tsrc) :
+static video::SMaterial baseMaterial()
-		scene::ISceneNode(RenderingEngine::get_scene_manager()->getRootSceneNode(),
-			RenderingEngine::get_scene_manager(), id)
 {
-	setAutomaticCulling(scene::EAC_OFF);
-	m_box.MaxEdge.set(0, 0, 0);
-	m_box.MinEdge.set(0, 0, 0);
-
-	// Create material
-
 	video::SMaterial mat;
 	mat.Lighting = false;
 #if ENABLE_GLES
@@ -59,14 +52,31 @@ Sky::Sky(s32 id, ITextureSource *tsrc) :
 	mat.TextureLayer[0].TextureWrapU = video::ETC_CLAMP_TO_EDGE;
 	mat.TextureLayer[0].TextureWrapV = video::ETC_CLAMP_TO_EDGE;
 	mat.BackfaceCulling = false;
+	return mat;
+};
 
-	m_materials[0] = mat;
+Sky::Sky(s32 id, ITextureSource *tsrc, IShaderSource *ssrc) :
+		scene::ISceneNode(RenderingEngine::get_scene_manager()->getRootSceneNode(),
+			RenderingEngine::get_scene_manager(), id)
+{
+	setAutomaticCulling(scene::EAC_OFF);
+	m_box.MaxEdge.set(0, 0, 0);
+	m_box.MinEdge.set(0, 0, 0);
 
-	m_materials[1] = mat;
+	m_enable_shaders = g_settings->getBool("enable_shaders");
+
+	// Create materials
+
+	m_materials[0] = baseMaterial();
+	m_materials[0].MaterialType = ssrc->getShaderInfo(ssrc->getShader("stars_shader", TILE_MATERIAL_ALPHA, 0)).material;
+	m_materials[0].Lighting = true;
+	m_materials[0].ColorMaterial = video::ECM_NONE;
+
+	m_materials[1] = baseMaterial();
 	//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] = baseMaterial();
 	m_materials[2].setTexture(0, tsrc->getTextureForMesh("sunrisebg.png"));
 	m_materials[2].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 	//m_materials[2].MaterialType = video::EMT_TRANSPARENT_ADD_COLOR;
@@ -83,7 +93,7 @@ Sky::Sky(s32 id, ITextureSource *tsrc) :
 		tsrc->getTexture(m_moon_params.tonemap) : NULL;
 
 	if (m_sun_texture) {
-		m_materials[3] = mat;
+		m_materials[3] = baseMaterial();
 		m_materials[3].setTexture(0, m_sun_texture);
 		m_materials[3].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 		// Disables texture filtering
@@ -95,7 +105,7 @@ Sky::Sky(s32 id, ITextureSource *tsrc) :
 			m_materials[3].Lighting = true;
 	}
 	if (m_moon_texture) {
-		m_materials[4] = mat;
+		m_materials[4] = baseMaterial();
 		m_materials[4].setTexture(0, m_moon_texture);
 		m_materials[4].MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL;
 		// Disables texture filtering
@@ -108,7 +118,7 @@ Sky::Sky(s32 id, ITextureSource *tsrc) :
 	}
 
 	for (int i = 5; i < 11; i++) {
-		m_materials[i] = mat;
+		m_materials[i] = baseMaterial();
 		m_materials[i].Lighting = true;
 		m_materials[i].MaterialType = video::EMT_SOLID;
 	}
@@ -205,7 +215,7 @@ void Sky::render()
 
 		const f32 t = 1.0f;
 		const f32 o = 0.0f;
-		static const u16 indices[4] = {0, 1, 2, 3};
+		static const u16 indices[6] = {0, 1, 2, 0, 2, 3};
 		video::S3DVertex vertices[4];
 
 		driver->setMaterial(m_materials[1]);
@@ -247,7 +257,7 @@ void Sky::render()
 						vertex.Pos.rotateXZBy(180);
 					}
 				}
-				driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+				driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 			}
 		}
 
@@ -273,7 +283,7 @@ void Sky::render()
 						// Switch from -Z (south) to +Z (north)
 						vertex.Pos.rotateXZBy(-180);
 				}
-				driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+				driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 			}
 		}*/
 
@@ -304,7 +314,7 @@ void Sky::render()
 					// Switch from -Z (south) to -X (west)
 					vertex.Pos.rotateXZBy(-90);
 			}
-			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+			driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 		}
 
 		// Draw sun
@@ -340,7 +350,7 @@ void Sky::render()
 						// Switch from -Z (south) to +Z (north)
 						vertex.Pos.rotateXZBy(-180);
 				}
-				driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+				driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 			}
 
 			// Draw bottom far cloudy fog thing in front of sun, moon and stars
@@ -349,7 +359,7 @@ void Sky::render()
 			vertices[1] = video::S3DVertex( 1, -1.0, -1, 0, 1, 0, c, o, t);
 			vertices[2] = video::S3DVertex( 1, -1.0, 1, 0, 1, 0, c, o, o);
 			vertices[3] = video::S3DVertex(-1, -1.0, 1, 0, 1, 0, c, t, o);
-			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+			driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 		}
 	}
 }
@@ -593,7 +603,7 @@ void Sky::draw_sun(video::IVideoDriver *driver, float sunsize, const video::SCol
 	 * wicked_time_of_day: current time of day, to know where should be the sun in the sky
 	 */
 {
-	static const u16 indices[4] = {0, 1, 2, 3};
+	static const u16 indices[] = {0, 1, 2, 0, 2, 3};
 	std::array<video::S3DVertex, 4> vertices;
 	if (!m_sun_texture) {
 		driver->setMaterial(m_materials[1]);
@@ -611,7 +621,7 @@ void Sky::draw_sun(video::IVideoDriver *driver, float sunsize, const video::SCol
 		for (int i = 0; i < 4; i++) {
 			draw_sky_body(vertices, -sunsizes[i], sunsizes[i], colors[i]);
 			place_sky_body(vertices, 90, wicked_time_of_day * 360 - 90);
-			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+			driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 		}
 	} else {
 		driver->setMaterial(m_materials[3]);
@@ -623,7 +633,7 @@ void Sky::draw_sun(video::IVideoDriver *driver, float sunsize, const video::SCol
 			c = video::SColor(255, 255, 255, 255);
 		draw_sky_body(vertices, -d, d, c);
 		place_sky_body(vertices, 90, wicked_time_of_day * 360 - 90);
-		driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+		driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 	}
 }
 
@@ -640,7 +650,7 @@ void Sky::draw_moon(video::IVideoDriver *driver, float moonsize, const video::SC
 	* the sky
 	*/
 {
-	static const u16 indices[4] = {0, 1, 2, 3};
+	static const u16 indices[] = {0, 1, 2, 0, 2, 3};
 	std::array<video::S3DVertex, 4> vertices;
 	if (!m_moon_texture) {
 		driver->setMaterial(m_materials[1]);
@@ -664,7 +674,7 @@ void Sky::draw_moon(video::IVideoDriver *driver, float moonsize, const video::SC
 		for (int i = 0; i < 4; i++) {
 			draw_sky_body(vertices, moonsizes_1[i], moonsizes_2[i], colors[i]);
 			place_sky_body(vertices, -90, wicked_time_of_day * 360 - 90);
-			driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+			driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 		}
 	} else {
 		driver->setMaterial(m_materials[4]);
@@ -676,13 +686,12 @@ void Sky::draw_moon(video::IVideoDriver *driver, float moonsize, const video::SC
 			c = video::SColor(255, 255, 255, 255);
 		draw_sky_body(vertices, -d, d, c);
 		place_sky_body(vertices, -90, wicked_time_of_day * 360 - 90);
-		driver->drawIndexedTriangleFan(&vertices[0], 4, indices, 2);
+		driver->drawIndexedTriangleList(&vertices[0], 4, indices, 2);
 	}
 }
 
 void Sky::draw_stars(video::IVideoDriver * driver, float wicked_time_of_day)
 {
-	driver->setMaterial(m_materials[1]);
 	// Tune values so that stars first appear just after the sun
 	// disappears over the horizon, and disappear just before the sun
 	// appears over the horizon.
@@ -690,87 +699,18 @@ void Sky::draw_stars(video::IVideoDriver * driver, float wicked_time_of_day)
 	// to time 4000.
 
 	float tod = wicked_time_of_day < 0.5f ? wicked_time_of_day : (1.0f - wicked_time_of_day);
-	float starbrightness = clamp((0.25f - fabsf(tod)) * 20.0f, 0.0f, 1.0f);
+	float starbrightness = (0.25f - fabsf(tod)) * 20.0f;
-
+	m_star_color = m_star_params.starcolor;
-	float f = starbrightness;
+	m_star_color.a = clamp(starbrightness * m_star_color.a, 0.0f, 1.0f);
-	float d = (0.006 / 2) * m_star_params.scale;
+	if (m_star_color.a <= 0.0f) // Stars are only drawn when not fully transparent
-
-	video::SColor starcolor = m_star_params.starcolor;
-	starcolor.setAlpha(f * m_star_params.starcolor.getAlpha());
-
-	// Stars are only drawn when not fully transparent
-	if (m_star_params.starcolor.getAlpha() < 1)
 		return;
-#if ENABLE_GLES
+	m_materials[0].DiffuseColor = m_materials[0].EmissiveColor = m_star_color.toSColor();
-	u16 *indices = new u16[m_star_params.count * 3];
+	auto sky_rotation = core::matrix4().setRotationAxisRadians(2.0f * M_PI * (wicked_time_of_day - 0.25f), v3f(0.0f, 0.0f, 1.0f));
-	video::S3DVertex *vertices =
+	auto world_matrix = driver->getTransform(video::ETS_WORLD);
-			new video::S3DVertex[m_star_params.count * 3];
+	driver->setTransform(video::ETS_WORLD, world_matrix * sky_rotation);
-	for (u32 i = 0; i < m_star_params.count; i++) {
+	driver->setMaterial(m_materials[0]);
-		indices[i * 3 + 0] = i * 3 + 0;
+	driver->drawMeshBuffer(m_stars.get());
-		indices[i * 3 + 1] = i * 3 + 1;
+	driver->setTransform(video::ETS_WORLD, world_matrix);
-		indices[i * 3 + 2] = i * 3 + 2;
-		v3f r = m_stars[i];
-		core::CMatrix4<f32> a;
-		a.buildRotateFromTo(v3f(0, 1, 0), r);
-		v3f p = v3f(-d, 1, -d);
-		v3f p1 = v3f(d, 1, 0);
-		v3f p2 = v3f(-d, 1, d);
-		a.rotateVect(p);
-		a.rotateVect(p1);
-		a.rotateVect(p2);
-		p.rotateXYBy(wicked_time_of_day * 360 - 90);
-		p1.rotateXYBy(wicked_time_of_day * 360 - 90);
-		p2.rotateXYBy(wicked_time_of_day * 360 - 90);
-		vertices[i * 3 + 0].Pos = p;
-		vertices[i * 3 + 0].Color = starcolor;
-		vertices[i * 3 + 1].Pos = p1;
-		vertices[i * 3 + 1].Color = starcolor;
-		vertices[i * 3 + 2].Pos = p2;
-		vertices[i * 3 + 2].Color = starcolor;
-	}
-	driver->drawIndexedTriangleList(vertices, m_star_params.count * 3,
-			indices, m_star_params.count);
-	delete[] indices;
-	delete[] vertices;
-#else
-	u16 *indices = new u16[m_star_params.count * 4];
-	video::S3DVertex *vertices =
-			new video::S3DVertex[m_star_params.count * 4];
-	for (u32 i = 0; i < m_star_params.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 r = m_stars[i];
-		core::CMatrix4<f32> a;
-		a.buildRotateFromTo(v3f(0, 1, 0), r);
-		v3f p = v3f(-d, 1, -d);
-		v3f p1 = v3f(d, 1, -d);
-		v3f p2 = v3f(d, 1, d);
-		v3f p3 = v3f(-d, 1, d);
-		a.rotateVect(p);
-		a.rotateVect(p1);
-		a.rotateVect(p2);
-		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, m_star_params.count * 4,
-			indices, m_star_params.count, video::EVT_STANDARD,
-			scene::EPT_QUADS, video::EIT_16BIT);
-	delete[] indices;
-	delete[] vertices;
-#endif
 }
 
 void Sky::draw_sky_body(std::array<video::S3DVertex, 4> &vertices, float pos_1, float pos_2, const video::SColor &c)
@@ -825,7 +765,7 @@ void Sky::setSunTexture(std::string sun_texture,
 		m_sun_texture = tsrc->getTextureForMesh(m_sun_params.texture);
 
 		if (m_sun_texture) {
-			m_materials[3] = m_materials[0];
+			m_materials[3] = baseMaterial();
 			m_materials[3].setTexture(0, m_sun_texture);
 			m_materials[3].MaterialType = video::
 				EMT_TRANSPARENT_ALPHA_CHANNEL;
@@ -873,7 +813,7 @@ void Sky::setMoonTexture(std::string moon_texture,
 		m_moon_texture = tsrc->getTextureForMesh(m_moon_params.texture);
 
 		if (m_moon_texture) {
-			m_materials[4] = m_materials[0];
+			m_materials[4] = baseMaterial();
 			m_materials[4].setTexture(0, m_moon_texture);
 			m_materials[4].MaterialType = video::
 				EMT_TRANSPARENT_ALPHA_CHANNEL;
@@ -895,19 +835,58 @@ void Sky::setStarCount(u16 star_count, bool force_update)
 	// Allow force updating star count at game init.
 	if (m_star_params.count != star_count || force_update) {
 		m_star_params.count = star_count;
-		m_stars.clear();
+		m_seed = (u64)myrand() << 32 | myrand();
-		// Rebuild the stars surrounding the camera
+		updateStars();
-		for (u16 i = 0; i < star_count; i++) {
+	}
-			v3f star = v3f(
+}
-				myrand_range(-10000, 10000),
-				myrand_range(-10000, 10000),
-				myrand_range(-10000, 10000)
-			);
 
-			star.normalize();
+void Sky::updateStars()
-			m_stars.emplace_back(star);
+{
+	m_stars.reset(new scene::SMeshBuffer());
+	// Stupid IrrLicht doesn’t allow non-indexed rendering, and indexed quad
+	// rendering is slow due to lack of hardware support. So as indices are
+	// 16-bit and there are 4 vertices per star... the limit is 2^16/4 = 0x4000.
+	// That should be well enough actually.
+	if (m_star_params.count > 0x4000) {
+		warningstream << "Requested " << m_star_params.count << " stars but " << 0x4000 << " is the max\n";
+		m_star_params.count = 0x4000;
 	}
+	m_stars->Vertices.reallocate(4 * m_star_params.count);
+	m_stars->Indices.reallocate(6 * m_star_params.count);
+
+	video::SColor fallback_color = m_star_params.starcolor; // used on GLES 2 “without shaders”
+	PcgRandom rgen(m_seed);
+	float d = (0.003 / 2) * m_star_params.scale;
+	for (u16 i = 0; i < m_star_params.count; i++) {
+		v3f r = v3f(
+			rgen.range(-10000, 10000),
+			rgen.range(-10000, 10000),
+			rgen.range(-10000, 10000)
+		);
+		core::CMatrix4<f32> a;
+		a.buildRotateFromTo(v3f(0, 1, 0), r);
+		v3f p = v3f(-d, 1, -d);
+		v3f p1 = v3f(d, 1, -d);
+		v3f p2 = v3f(d, 1, d);
+		v3f p3 = v3f(-d, 1, d);
+		a.rotateVect(p);
+		a.rotateVect(p1);
+		a.rotateVect(p2);
+		a.rotateVect(p3);
+		m_stars->Vertices.push_back(video::S3DVertex(p, {}, fallback_color, {}));
+		m_stars->Vertices.push_back(video::S3DVertex(p1, {}, fallback_color, {}));
+		m_stars->Vertices.push_back(video::S3DVertex(p2, {}, fallback_color, {}));
+		m_stars->Vertices.push_back(video::S3DVertex(p3, {}, fallback_color, {}));
 	}
+	for (u16 i = 0; i < m_star_params.count; i++) {
+		m_stars->Indices.push_back(i * 4 + 0);
+		m_stars->Indices.push_back(i * 4 + 1);
+		m_stars->Indices.push_back(i * 4 + 2);
+		m_stars->Indices.push_back(i * 4 + 2);
+		m_stars->Indices.push_back(i * 4 + 3);
+		m_stars->Indices.push_back(i * 4 + 0);
+	}
+	m_stars->setHardwareMappingHint(scene::EHM_STATIC);
 }
 
 void Sky::setSkyColors(const SkyColor &sky_color)
@@ -939,7 +918,7 @@ void Sky::addTextureToSkybox(std::string texture, int material_id,
 	// Keep a list of texture names handy.
 	m_sky_params.textures.emplace_back(texture);
 	video::ITexture *result = tsrc->getTextureForMesh(texture);
-	m_materials[material_id+5] = m_materials[0];
+	m_materials[material_id+5] = baseMaterial();
 	m_materials[material_id+5].setTexture(0, result);
 	m_materials[material_id+5].MaterialType = video::EMT_SOLID;
 }

src/client/sky.h

@@ -17,10 +17,12 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
+#include "irrlichttypes_extrabloated.h"
 #include <ISceneNode.h>
 #include <array>
 #include "camera.h"
-#include "irrlichttypes_extrabloated.h"
+#include "irr_ptr.h"
+#include "shader.h"
 #include "skyparams.h"
 
 #pragma once
@@ -34,7 +36,7 @@ class Sky : public scene::ISceneNode
 {
 public:
 	//! constructor
-	Sky(s32 id, ITextureSource *tsrc);
+	Sky(s32 id, ITextureSource *tsrc, IShaderSource *ssrc);
 
 	virtual void OnRegisterSceneNode();
 
@@ -77,7 +79,7 @@ public:
 	void setStarsVisible(bool stars_visible) { m_star_params.visible = stars_visible; }
 	void setStarCount(u16 star_count, bool force_update);
 	void setStarColor(video::SColor star_color) { m_star_params.starcolor = star_color; }
-	void setStarScale(f32 star_scale) { m_star_params.scale = star_scale; }
+	void setStarScale(f32 star_scale) { m_star_params.scale = star_scale; updateStars(); }
 
 	bool getCloudsVisible() const { return m_clouds_visible && m_clouds_enabled; }
 	const video::SColorf &getCloudColor() const { return m_cloudcolor_f; }
@@ -101,6 +103,8 @@ public:
 	void clearSkyboxTextures() { m_sky_params.textures.clear(); }
 	void addTextureToSkybox(std::string texture, int material_id,
 		ITextureSource *tsrc);
+	const video::SColorf &getCurrentStarColor() const { return m_star_color; }
+
 private:
 	aabb3f m_box;
 	video::SMaterial m_materials[SKY_MATERIAL_COUNT];
@@ -154,6 +158,7 @@ private:
 	bool m_clouds_enabled = true; // Initialised to true, reset only by set_sky API
 	bool m_directional_colored_fog;
 	bool m_in_clouds = true; // Prevent duplicating bools to remember old values
+	bool m_enable_shaders = false;
 
 	video::SColorf m_bgcolor_bright_f = video::SColorf(1.0f, 1.0f, 1.0f, 1.0f);
 	video::SColorf m_skycolor_bright_f = video::SColorf(1.0f, 1.0f, 1.0f, 1.0f);
@@ -178,13 +183,17 @@ private:
 
 	bool m_default_tint = true;
 
-	std::vector<v3f> m_stars;
+	u64 m_seed = 0;
+	irr_ptr<scene::SMeshBuffer> m_stars;
+	video::SColorf m_star_color;
 
 	video::ITexture *m_sun_texture;
 	video::ITexture *m_moon_texture;
 	video::ITexture *m_sun_tonemap;
 	video::ITexture *m_moon_tonemap;
 
+	void updateStars();
+
 	void draw_sun(video::IVideoDriver *driver, float sunsize, const video::SColor &suncolor,
 		const video::SColor &suncolor2, float wicked_time_of_day);
 	void draw_moon(video::IVideoDriver *driver, float moonsize, const video::SColor &mooncolor,