Shadow mapping render pass (#11244)

Co-authored-by: x2048 <codeforsmile@gmail.com>

src/client/CMakeLists.txt

@@ -58,5 +58,9 @@ set(client_SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/sky.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/tile.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/wieldmesh.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/shadows/dynamicshadows.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/shadows/dynamicshadowsrender.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/shadows/shadowsshadercallbacks.cpp	
+	${CMAKE_CURRENT_SOURCE_DIR}/shadows/shadowsScreenQuad.cpp	
 	PARENT_SCOPE
 )

src/client/clientmap.cpp

@@ -72,8 +72,15 @@ ClientMap::ClientMap(
 	scene::ISceneNode(rendering_engine->get_scene_manager()->getRootSceneNode(),
 		rendering_engine->get_scene_manager(), id),
 	m_client(client),
+	m_rendering_engine(rendering_engine),
 	m_control(control)
 {
+
+	/*
+	 * @Liso: Sadly C++ doesn't have introspection, so the only way we have to know
+	 * the class is whith a name ;) Name property cames from ISceneNode base class.
+	 */
+	Name = "ClientMap";
 	m_box = aabb3f(-BS*1000000,-BS*1000000,-BS*1000000,
 			BS*1000000,BS*1000000,BS*1000000);
 
@@ -115,12 +122,21 @@ void ClientMap::OnRegisterSceneNode()
 	}
 
 	ISceneNode::OnRegisterSceneNode();
+
+	if (!m_added_to_shadow_renderer) {
+		m_added_to_shadow_renderer = true;
+		if (auto shadows = m_rendering_engine->get_shadow_renderer())
+			shadows->addNodeToShadowList(this);
+	}
 }
 
 void ClientMap::getBlocksInViewRange(v3s16 cam_pos_nodes,
-		v3s16 *p_blocks_min, v3s16 *p_blocks_max)
+		v3s16 *p_blocks_min, v3s16 *p_blocks_max, float range)
 {
-	v3s16 box_nodes_d = m_control.wanted_range * v3s16(1, 1, 1);
+	if (range <= 0.0f)
+		range = m_control.wanted_range;
+
+	v3s16 box_nodes_d = range * v3s16(1, 1, 1);
 	// Define p_nodes_min/max as v3s32 because 'cam_pos_nodes -/+ box_nodes_d'
 	// can exceed the range of v3s16 when a large view range is used near the
 	// world edges.
@@ -321,7 +337,6 @@ void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
 
 		// Mesh animation
 		if (pass == scene::ESNRP_SOLID) {
-			//MutexAutoLock lock(block->mesh_mutex);
 			MapBlockMesh *mapBlockMesh = block->mesh;
 			assert(mapBlockMesh);
 			// Pretty random but this should work somewhat nicely
@@ -342,8 +357,6 @@ void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
 			Get the meshbuffers of the block
 		*/
 		{
-			//MutexAutoLock lock(block->mesh_mutex);
-
 			MapBlockMesh *mapBlockMesh = block->mesh;
 			assert(mapBlockMesh);
 
@@ -394,6 +407,17 @@ void ClientMap::renderMap(video::IVideoDriver* driver, s32 pass)
 						"returning." << std::endl;
 				return;
 			}
+
+			// pass the shadow map texture to the buffer texture
+			ShadowRenderer *shadow = m_rendering_engine->get_shadow_renderer();
+			if (shadow && shadow->is_active()) {
+				auto &layer = list.m.TextureLayer[3];
+				layer.Texture = shadow->get_texture();
+				layer.TextureWrapU = video::E_TEXTURE_CLAMP::ETC_CLAMP_TO_EDGE;
+				layer.TextureWrapV = video::E_TEXTURE_CLAMP::ETC_CLAMP_TO_EDGE;
+				layer.TrilinearFilter = true;
+			}
+
 			driver->setMaterial(list.m);
 
 			drawcall_count += list.bufs.size();
@@ -610,3 +634,187 @@ void ClientMap::PrintInfo(std::ostream &out)
 {
 	out<<"ClientMap: ";
 }
+
+void ClientMap::renderMapShadows(video::IVideoDriver *driver,
+		const video::SMaterial &material, s32 pass)
+{
+	bool is_transparent_pass = pass != scene::ESNRP_SOLID;
+	std::string prefix;
+	if (is_transparent_pass)
+		prefix = "renderMap(SHADOW TRANS): ";
+	else
+		prefix = "renderMap(SHADOW SOLID): ";
+
+	u32 drawcall_count = 0;
+	u32 vertex_count = 0;
+
+	MeshBufListList drawbufs;
+
+	for (auto &i : m_drawlist_shadow) {
+		v3s16 block_pos = i.first;
+		MapBlock *block = i.second;
+
+		// If the mesh of the block happened to get deleted, ignore it
+		if (!block->mesh)
+			continue;
+
+		/*
+			Get the meshbuffers of the block
+		*/
+		{
+			MapBlockMesh *mapBlockMesh = block->mesh;
+			assert(mapBlockMesh);
+
+			for (int layer = 0; layer < MAX_TILE_LAYERS; layer++) {
+				scene::IMesh *mesh = mapBlockMesh->getMesh(layer);
+				assert(mesh);
+
+				u32 c = mesh->getMeshBufferCount();
+				for (u32 i = 0; i < c; i++) {
+					scene::IMeshBuffer *buf = mesh->getMeshBuffer(i);
+
+					video::SMaterial &mat = buf->getMaterial();
+					auto rnd = driver->getMaterialRenderer(mat.MaterialType);
+					bool transparent = rnd && rnd->isTransparent();
+					if (transparent == is_transparent_pass)
+						drawbufs.add(buf, block_pos, layer);
+				}
+			}
+		}
+	}
+
+	TimeTaker draw("Drawing shadow mesh buffers");
+
+	core::matrix4 m; // Model matrix
+	v3f offset = intToFloat(m_camera_offset, BS);
+
+	// Render all layers in order
+	for (auto &lists : drawbufs.lists) {
+		for (MeshBufList &list : lists) {
+			// Check and abort if the machine is swapping a lot
+			if (draw.getTimerTime() > 1000) {
+				infostream << "ClientMap::renderMapShadows(): Rendering "
+						"took >1s, returning." << std::endl;
+				break;
+			}
+			for (auto &pair : list.bufs) {
+				scene::IMeshBuffer *buf = pair.second;
+
+				// override some material properties
+				video::SMaterial local_material = buf->getMaterial();
+				local_material.MaterialType = material.MaterialType;
+				local_material.BackfaceCulling = material.BackfaceCulling;
+				local_material.FrontfaceCulling = material.FrontfaceCulling;
+				local_material.Lighting = false;
+				driver->setMaterial(local_material);
+
+				v3f block_wpos = intToFloat(pair.first * MAP_BLOCKSIZE, BS);
+				m.setTranslation(block_wpos - offset);
+
+				driver->setTransform(video::ETS_WORLD, m);
+				driver->drawMeshBuffer(buf);
+				vertex_count += buf->getVertexCount();
+			}
+
+			drawcall_count += list.bufs.size();
+		}
+	}
+
+	g_profiler->avg(prefix + "draw meshes [ms]", draw.stop(true));
+	g_profiler->avg(prefix + "vertices drawn [#]", vertex_count);
+	g_profiler->avg(prefix + "drawcalls [#]", drawcall_count);
+}
+
+/*
+	Custom update draw list for the pov of shadow light.
+*/
+void ClientMap::updateDrawListShadow(const v3f &shadow_light_pos, const v3f &shadow_light_dir, float shadow_range)
+{
+	ScopeProfiler sp(g_profiler, "CM::updateDrawListShadow()", SPT_AVG);
+
+	const v3f camera_position = shadow_light_pos;
+	const v3f camera_direction = shadow_light_dir;
+	// I "fake" fov just to avoid creating a new function to handle orthographic
+	// projection.
+	const f32 camera_fov = m_camera_fov * 1.9f;
+
+	v3s16 cam_pos_nodes = floatToInt(camera_position, BS);
+	v3s16 p_blocks_min;
+	v3s16 p_blocks_max;
+	getBlocksInViewRange(cam_pos_nodes, &p_blocks_min, &p_blocks_max, shadow_range);
+
+	std::vector<v2s16> blocks_in_range;
+
+	for (auto &i : m_drawlist_shadow) {
+		MapBlock *block = i.second;
+		block->refDrop();
+	}
+	m_drawlist_shadow.clear();
+
+	// We need to append the blocks from the camera POV because sometimes
+	// they are not inside the light frustum and it creates glitches.
+	// FIXME: This could be removed if we figure out why they are missing
+	// from the light frustum.
+	for (auto &i : m_drawlist) {
+		i.second->refGrab();
+		m_drawlist_shadow[i.first] = i.second;
+	}
+
+	// Number of blocks currently loaded by the client
+	u32 blocks_loaded = 0;
+	// Number of blocks with mesh in rendering range
+	u32 blocks_in_range_with_mesh = 0;
+	// Number of blocks occlusion culled
+	u32 blocks_occlusion_culled = 0;
+
+	for (auto &sector_it : m_sectors) {
+		MapSector *sector = sector_it.second;
+		if (!sector)
+			continue;
+		blocks_loaded += sector->size();
+
+		MapBlockVect sectorblocks;
+		sector->getBlocks(sectorblocks);
+
+		/*
+			Loop through blocks in sector
+		*/
+		for (MapBlock *block : sectorblocks) {
+			if (!block->mesh) {
+				// Ignore if mesh doesn't exist
+				continue;
+			}
+
+			float range = shadow_range;
+
+			float d = 0.0;
+			if (!isBlockInSight(block->getPos(), camera_position,
+					    camera_direction, camera_fov, range, &d))
+				continue;
+
+			blocks_in_range_with_mesh++;
+
+			/*
+				Occlusion culling
+			*/
+			if (isBlockOccluded(block, cam_pos_nodes)) {
+				blocks_occlusion_culled++;
+				continue;
+			}
+
+			// This block is in range. Reset usage timer.
+			block->resetUsageTimer();
+
+			// Add to set
+			if (m_drawlist_shadow.find(block->getPos()) == m_drawlist_shadow.end()) {
+				block->refGrab();
+				m_drawlist_shadow[block->getPos()] = block;
+			}
+		}
+	}
+
+	g_profiler->avg("SHADOW MapBlock meshes in range [#]", blocks_in_range_with_mesh);
+	g_profiler->avg("SHADOW MapBlocks occlusion culled [#]", blocks_occlusion_culled);
+	g_profiler->avg("SHADOW MapBlocks drawn [#]", m_drawlist_shadow.size());
+	g_profiler->avg("SHADOW MapBlocks loaded [#]", blocks_loaded);
+}

src/client/clientmap.h

@@ -119,10 +119,14 @@ public:
 	}
 
 	void getBlocksInViewRange(v3s16 cam_pos_nodes,
-		v3s16 *p_blocks_min, v3s16 *p_blocks_max);
+		v3s16 *p_blocks_min, v3s16 *p_blocks_max, float range=-1.0f);
 	void updateDrawList();
+	void updateDrawListShadow(const v3f &shadow_light_pos, const v3f &shadow_light_dir, float shadow_range);
 	void renderMap(video::IVideoDriver* driver, s32 pass);
 
+	void renderMapShadows(video::IVideoDriver *driver,
+			const video::SMaterial &material, s32 pass);
+
 	int getBackgroundBrightness(float max_d, u32 daylight_factor,
 			int oldvalue, bool *sunlight_seen_result);
 
@@ -132,9 +136,12 @@ public:
 	virtual void PrintInfo(std::ostream &out);
 
 	const MapDrawControl & getControl() const { return m_control; }
+	f32 getWantedRange() const { return m_control.wanted_range; }
 	f32 getCameraFov() const { return m_camera_fov; }
+
 private:
 	Client *m_client;
+	RenderingEngine *m_rendering_engine;
 
 	aabb3f m_box = aabb3f(-BS * 1000000, -BS * 1000000, -BS * 1000000,
 		BS * 1000000, BS * 1000000, BS * 1000000);
@@ -147,10 +154,12 @@ private:
 	v3s16 m_camera_offset;
 
 	std::map<v3s16, MapBlock*> m_drawlist;
+	std::map<v3s16, MapBlock*> m_drawlist_shadow;
 
 	std::set<v2s16> m_last_drawn_sectors;
 
 	bool m_cache_trilinear_filter;
 	bool m_cache_bilinear_filter;
 	bool m_cache_anistropic_filter;
+	bool m_added_to_shadow_renderer{false};
 };

src/client/content_cao.cpp

@@ -24,6 +24,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <IMeshManipulator.h>
 #include <IAnimatedMeshSceneNode.h>
 #include "client/client.h"
+#include "client/renderingengine.h"
 #include "client/sound.h"
 #include "client/tile.h"
 #include "util/basic_macros.h"
@@ -555,6 +556,9 @@ void GenericCAO::removeFromScene(bool permanent)
 		clearParentAttachment();
 	}
 
+	if (auto shadow = RenderingEngine::get_shadow_renderer())
+		shadow->removeNodeFromShadowList(getSceneNode());
+
 	if (m_meshnode) {
 		m_meshnode->remove();
 		m_meshnode->drop();
@@ -803,10 +807,13 @@ void GenericCAO::addToScene(ITextureSource *tsrc, scene::ISceneManager *smgr)
 	if (m_reset_textures_timer < 0)
 		updateTextures(m_current_texture_modifier);
 
-	scene::ISceneNode *node = getSceneNode();
+	if (scene::ISceneNode *node = getSceneNode()) {
+		if (m_matrixnode)
+			node->setParent(m_matrixnode);
 
-	if (node && m_matrixnode)
-		node->setParent(m_matrixnode);
+		if (auto shadow = RenderingEngine::get_shadow_renderer())
+			shadow->addNodeToShadowList(node);
+	}
 
 	updateNametag();
 	updateMarker();

src/client/game.cpp

@@ -738,6 +738,7 @@ protected:
 			const ItemStack &selected_item, const ItemStack &hand_item, f32 dtime);
 	void updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 			const CameraOrientation &cam);
+	void updateShadows();
 
 	// Misc
 	void limitFps(FpsControl *fps_timings, f32 *dtime);
@@ -3831,13 +3832,20 @@ void Game::updateFrame(ProfilerGraph *graph, RunStats *stats, f32 dtime,
 	*/
 	runData.update_draw_list_timer += dtime;
 
+	float update_draw_list_delta = 0.2f;
+	if (ShadowRenderer *shadow = RenderingEngine::get_shadow_renderer())
+		update_draw_list_delta = shadow->getUpdateDelta();
+
 	v3f camera_direction = camera->getDirection();
-	if (runData.update_draw_list_timer >= 0.2
+	if (runData.update_draw_list_timer >= update_draw_list_delta
 			|| runData.update_draw_list_last_cam_dir.getDistanceFrom(camera_direction) > 0.2
 			|| m_camera_offset_changed) {
+
 		runData.update_draw_list_timer = 0;
 		client->getEnv().getClientMap().updateDrawList();
 		runData.update_draw_list_last_cam_dir = camera_direction;
+
+		updateShadows();
 	}
 
 	m_game_ui->update(*stats, client, draw_control, cam, runData.pointed_old, gui_chat_console, dtime);
@@ -3968,7 +3976,34 @@ inline void Game::updateProfilerGraphs(ProfilerGraph *graph)
 	graph->put(values);
 }
 
+/****************************************************************************
+ * Shadows
+ *****************************************************************************/
+void Game::updateShadows()
+{
+	ShadowRenderer *shadow = RenderingEngine::get_shadow_renderer();
+	if (!shadow)
+		return;
 
+	float in_timeofday = fmod(runData.time_of_day_smooth, 1.0f);
+
+	float timeoftheday = fmod(getWickedTimeOfDay(in_timeofday) + 0.75f, 0.5f) + 0.25f;
+	const float offset_constant = 10000.0f;
+
+	v3f light(0.0f, 0.0f, -1.0f);
+	light.rotateXZBy(90);
+	light.rotateXYBy(timeoftheday * 360 - 90);
+	light.rotateYZBy(sky->getSkyBodyOrbitTilt());
+
+	v3f sun_pos = light * offset_constant;
+
+	if (shadow->getDirectionalLightCount() == 0)
+		shadow->addDirectionalLight();
+	shadow->getDirectionalLight().setDirection(sun_pos);
+	shadow->setTimeOfDay(in_timeofday);
+
+	shadow->getDirectionalLight().update_frustum(camera, client);
+}
 
 /****************************************************************************
  Misc

src/client/mapblock_mesh.cpp

@@ -860,6 +860,9 @@ static void updateFastFaceRow(
 		g_settings->getBool("enable_shaders") &&
 		g_settings->getBool("enable_waving_water");
 
+	static thread_local const bool force_not_tiling =
+			g_settings->getBool("enable_dynamic_shadows");
+
 	v3s16 p = startpos;
 
 	u16 continuous_tiles_count = 1;
@@ -898,7 +901,8 @@ static void updateFastFaceRow(
 					waving,
 					next_tile);
 
-			if (next_makes_face == makes_face
+			if (!force_not_tiling
+					&& next_makes_face == makes_face
 					&& next_p_corrected == p_corrected + translate_dir
 					&& next_face_dir_corrected == face_dir_corrected
 					&& memcmp(next_lights, lights, sizeof(lights)) == 0

src/client/render/core.cpp

@@ -24,25 +24,35 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "client/clientmap.h"
 #include "client/hud.h"
 #include "client/minimap.h"
+#include "client/shadows/dynamicshadowsrender.h"
 
 RenderingCore::RenderingCore(IrrlichtDevice *_device, Client *_client, Hud *_hud)
 	: device(_device), driver(device->getVideoDriver()), smgr(device->getSceneManager()),
 	guienv(device->getGUIEnvironment()), client(_client), camera(client->getCamera()),
-	mapper(client->getMinimap()), hud(_hud)
+	mapper(client->getMinimap()), hud(_hud),
+	shadow_renderer(nullptr)
 {
 	screensize = driver->getScreenSize();
 	virtual_size = screensize;
+
+	if (g_settings->getBool("enable_shaders") &&
+			g_settings->getBool("enable_dynamic_shadows")) {
+		shadow_renderer = new ShadowRenderer(device, client);
+	}
 }
 
 RenderingCore::~RenderingCore()
 {
 	clearTextures();
+	delete shadow_renderer;
 }
 
 void RenderingCore::initialize()
 {
 	// have to be called late as the VMT is not ready in the constructor:
 	initTextures();
+	if (shadow_renderer)
+		shadow_renderer->initialize();
 }
 
 void RenderingCore::updateScreenSize()
@@ -72,7 +82,14 @@ void RenderingCore::draw(video::SColor _skycolor, bool _show_hud, bool _show_min
 
 void RenderingCore::draw3D()
 {
-	smgr->drawAll();
+	if (shadow_renderer) {
+		// Shadow renderer will handle the draw stage
+		shadow_renderer->setClearColor(skycolor);
+		shadow_renderer->update();
+	} else {
+		smgr->drawAll();
+	}
+
 	driver->setTransform(video::ETS_WORLD, core::IdentityMatrix);
 	if (!show_hud)
 		return;

src/client/render/core.h

@@ -21,6 +21,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #pragma once
 #include "irrlichttypes_extrabloated.h"
 
+class ShadowRenderer;
 class Camera;
 class Client;
 class Hud;
@@ -47,6 +48,8 @@ protected:
 	Minimap *mapper;
 	Hud *hud;
 
+	ShadowRenderer *shadow_renderer;
+
 	void updateScreenSize();
 	virtual void initTextures() {}
 	virtual void clearTextures() {}
@@ -72,4 +75,6 @@ public:
 			bool _draw_wield_tool, bool _draw_crosshair);
 
 	inline v2u32 getVirtualSize() const { return virtual_size; }
+
+	ShadowRenderer *get_shadow_renderer() { return shadow_renderer; };
 };

src/client/renderingengine.h

@@ -25,6 +25,10 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <string>
 #include "irrlichttypes_extrabloated.h"
 #include "debug.h"
+#include "client/render/core.h"
+// include the shadow mapper classes too
+#include "client/shadows/dynamicshadowsrender.h"
+
 
 class ITextureSource;
 class Camera;
@@ -113,6 +117,13 @@ public:
 		return m_device->run();
 	}
 
+	// FIXME: this is still global when it shouldn't be
+	static ShadowRenderer *get_shadow_renderer()
+	{
+		if (s_singleton && s_singleton->core)
+			return s_singleton->core->get_shadow_renderer();
+		return nullptr;
+	}
 	static std::vector<core::vector3d<u32>> getSupportedVideoModes();
 	static std::vector<irr::video::E_DRIVER_TYPE> getSupportedVideoDrivers();
 

src/client/shader.cpp

@@ -225,6 +225,16 @@ class MainShaderConstantSetter : public IShaderConstantSetter
 {
 	CachedVertexShaderSetting<float, 16> m_world_view_proj;
 	CachedVertexShaderSetting<float, 16> m_world;
+
+	// Shadow-related
+	CachedPixelShaderSetting<float, 16> m_shadow_view_proj;
+	CachedPixelShaderSetting<float, 3> m_light_direction;
+	CachedPixelShaderSetting<float> m_texture_res;
+	CachedPixelShaderSetting<float> m_shadow_strength;
+	CachedPixelShaderSetting<float> m_time_of_day;
+	CachedPixelShaderSetting<float> m_shadowfar;
+	CachedPixelShaderSetting<s32> m_shadow_texture;
+
 #if ENABLE_GLES
 	// Modelview matrix
 	CachedVertexShaderSetting<float, 16> m_world_view;
@@ -243,6 +253,13 @@ public:
 		, m_texture("mTexture")
 		, m_normal("mNormal")
 #endif
+		, m_shadow_view_proj("m_ShadowViewProj")
+		, m_light_direction("v_LightDirection")
+		, m_texture_res("f_textureresolution")
+		, m_shadow_strength("f_shadow_strength")
+		, m_time_of_day("f_timeofday")
+		, m_shadowfar("f_shadowfar")
+		, m_shadow_texture("ShadowMapSampler")
 	{}
 	~MainShaderConstantSetter() = default;
 
@@ -280,6 +297,36 @@ public:
 		};
 		m_normal.set(m, services);
 #endif
+
+		// Set uniforms for Shadow shader
+		if (ShadowRenderer *shadow = RenderingEngine::get_shadow_renderer()) {
+			const auto &light = shadow->getDirectionalLight();
+
+			core::matrix4 shadowViewProj = light.getProjectionMatrix();
+			shadowViewProj *= light.getViewMatrix();
+			m_shadow_view_proj.set(shadowViewProj.pointer(), services);
+
+			float v_LightDirection[3];
+			light.getDirection().getAs3Values(v_LightDirection);
+			m_light_direction.set(v_LightDirection, services);
+
+			float TextureResolution = light.getMapResolution();
+			m_texture_res.set(&TextureResolution, services);
+
+			float ShadowStrength = shadow->getShadowStrength();
+			m_shadow_strength.set(&ShadowStrength, services);
+
+			float timeOfDay = shadow->getTimeOfDay();
+			m_time_of_day.set(&timeOfDay, services);
+
+			float shadowFar = shadow->getMaxShadowFar();
+			m_shadowfar.set(&shadowFar, services);
+
+			// I dont like using this hardcoded value. maybe something like
+			// MAX_TEXTURE - 1 or somthing like that??
+			s32 TextureLayerID = 3;
+			m_shadow_texture.set(&TextureLayerID, services);
+		}
 	}
 };
 
@@ -682,6 +729,23 @@ ShaderInfo ShaderSource::generateShader(const std::string &name,
 
 	shaders_header << "#define FOG_START " << core::clamp(g_settings->getFloat("fog_start"), 0.0f, 0.99f) << "\n";
 
+	if (g_settings->getBool("enable_dynamic_shadows")) {
+		shaders_header << "#define ENABLE_DYNAMIC_SHADOWS 1\n";
+		if (g_settings->getBool("shadow_map_color"))
+			shaders_header << "#define COLORED_SHADOWS 1\n";
+
+		if (g_settings->getBool("shadow_poisson_filter"))
+			shaders_header << "#define POISSON_FILTER 1\n";
+
+		s32 shadow_filter = g_settings->getS32("shadow_filters");
+		shaders_header << "#define SHADOW_FILTER " << shadow_filter << "\n";
+
+		float shadow_soft_radius = g_settings->getS32("shadow_soft_radius");
+		if (shadow_soft_radius < 1.0f)
+			shadow_soft_radius = 1.0f;
+		shaders_header << "#define SOFTSHADOWRADIUS " << shadow_soft_radius << "\n";
+	}
+
 	std::string common_header = shaders_header.str();
 
 	std::string vertex_shader = m_sourcecache.getOrLoad(name, "opengl_vertex.glsl");

src/client/shadows/dynamicshadows.cpp

@@ -0,0 +1,145 @@
+/*
+Minetest
+Copyright (C) 2021 Liso <anlismon@gmail.com>
+
+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
+(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.
+
+You should have received a copy of the GNU Lesser 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 <cmath>
+
+#include "client/shadows/dynamicshadows.h"
+#include "client/client.h"
+#include "client/clientenvironment.h"
+#include "client/clientmap.h"
+#include "client/camera.h"
+
+using m4f = core::matrix4;
+
+void DirectionalLight::createSplitMatrices(const Camera *cam)
+{
+	float radius;
+	v3f newCenter;
+	v3f look = cam->getDirection();
+
+	v3f camPos2 = cam->getPosition();
+	v3f camPos = v3f(camPos2.X - cam->getOffset().X * BS,
+			camPos2.Y - cam->getOffset().Y * BS,
+			camPos2.Z - cam->getOffset().Z * BS);
+	camPos += look * shadow_frustum.zNear;
+	camPos2 += look * shadow_frustum.zNear;
+	float end = shadow_frustum.zNear + shadow_frustum.zFar;
+	newCenter = camPos + look * (shadow_frustum.zNear + 0.05f * end);
+	v3f world_center = camPos2 + look * (shadow_frustum.zNear + 0.05f * end);
+	// Create a vector to the frustum far corner
+	// @Liso: move all vars we can outside the loop.
+	float tanFovY = tanf(cam->getFovY() * 0.5f);
+	float tanFovX = tanf(cam->getFovX() * 0.5f);
+
+	const v3f &viewUp = cam->getCameraNode()->getUpVector();
+	// viewUp.normalize();
+
+	v3f viewRight = look.crossProduct(viewUp);
+	// viewRight.normalize();
+
+	v3f farCorner = look + viewRight * tanFovX + viewUp * tanFovY;
+	// Compute the frustumBoundingSphere radius
+	v3f boundVec = (camPos + farCorner * shadow_frustum.zFar) - newCenter;
+	radius = boundVec.getLength() * 2.0f;
+	// boundVec.getLength();
+	float vvolume = radius * 2.0f;
+
+	float texelsPerUnit = getMapResolution() / vvolume;
+	m4f mTexelScaling;
+	mTexelScaling.setScale(texelsPerUnit);
+
+	m4f mLookAt, mLookAtInv;
+
+	mLookAt.buildCameraLookAtMatrixLH(v3f(0.0f, 0.0f, 0.0f), -direction, v3f(0.0f, 1.0f, 0.0f));
+
+	mLookAt *= mTexelScaling;
+	mLookAtInv = mLookAt;
+	mLookAtInv.makeInverse();
+
+	v3f frustumCenter = newCenter;
+	mLookAt.transformVect(frustumCenter);
+	frustumCenter.X = floorf(frustumCenter.X); // clamp to texel increment
+	frustumCenter.Y = floorf(frustumCenter.Y); // clamp to texel increment
+	frustumCenter.Z = floorf(frustumCenter.Z);
+	mLookAtInv.transformVect(frustumCenter);
+	// probar radius multipliacdor en funcion del I, a menor I mas multiplicador
+	v3f eye_displacement = direction * vvolume;
+
+	// we must compute the viewmat with the position - the camera offset
+	// but the shadow_frustum position must be the actual world position
+	v3f eye = frustumCenter - eye_displacement;
+	shadow_frustum.position = world_center - eye_displacement;
+	shadow_frustum.length = vvolume;
+	shadow_frustum.ViewMat.buildCameraLookAtMatrixLH(eye, frustumCenter, v3f(0.0f, 1.0f, 0.0f));
+	shadow_frustum.ProjOrthMat.buildProjectionMatrixOrthoLH(shadow_frustum.length,
+			shadow_frustum.length, -shadow_frustum.length,
+			shadow_frustum.length,false);
+}
+
+DirectionalLight::DirectionalLight(const u32 shadowMapResolution,
+		const v3f &position, video::SColorf lightColor,
+		f32 farValue) :
+		diffuseColor(lightColor),
+		farPlane(farValue), mapRes(shadowMapResolution), pos(position)
+{}
+
+void DirectionalLight::update_frustum(const Camera *cam, Client *client)
+{
+	should_update_map_shadow = true;
+	float zNear = cam->getCameraNode()->getNearValue();
+	float zFar = getMaxFarValue();
+
+	///////////////////////////////////
+	// update splits near and fars
+	shadow_frustum.zNear = zNear;
+	shadow_frustum.zFar = zFar;
+
+	// update shadow frustum
+	createSplitMatrices(cam);
+	// get the draw list for shadows
+	client->getEnv().getClientMap().updateDrawListShadow(
+			getPosition(), getDirection(), shadow_frustum.length);
+	should_update_map_shadow = true;
+}
+
+void DirectionalLight::setDirection(v3f dir)
+{
+	direction = -dir;
+	direction.normalize();
+}
+
+v3f DirectionalLight::getPosition() const
+{
+	return shadow_frustum.position;
+}
+
+const m4f &DirectionalLight::getViewMatrix() const
+{
+	return shadow_frustum.ViewMat;
+}
+
+const m4f &DirectionalLight::getProjectionMatrix() const
+{
+	return shadow_frustum.ProjOrthMat;
+}
+
+m4f DirectionalLight::getViewProjMatrix()
+{
+	return shadow_frustum.ProjOrthMat * shadow_frustum.ViewMat;
+}

src/client/shadows/dynamicshadows.h

@@ -0,0 +1,102 @@
+/*
+Minetest
+Copyright (C) 2021 Liso <anlismon@gmail.com>
+
+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
+(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.
+
+You should have received a copy of the GNU Lesser 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.
+*/
+
+#pragma once
+
+#include "irrlichttypes_bloated.h"
+#include <matrix4.h>
+#include "util/basic_macros.h"
+
+class Camera;
+class Client;
+
+struct shadowFrustum
+{
+	float zNear{0.0f};
+	float zFar{0.0f};
+	float length{0.0f};
+	core::matrix4 ProjOrthMat;
+	core::matrix4 ViewMat;
+	v3f position;
+};
+
+class DirectionalLight
+{
+public:
+	DirectionalLight(const u32 shadowMapResolution,
+			const v3f &position,
+			video::SColorf lightColor = video::SColor(0xffffffff),
+			f32 farValue = 100.0f);
+	~DirectionalLight() = default;
+
+	//DISABLE_CLASS_COPY(DirectionalLight)
+
+	void update_frustum(const Camera *cam, Client *client);
+
+	// when set direction is updated to negative normalized(direction)
+	void setDirection(v3f dir);
+	v3f getDirection() const{
+		return direction;
+	};
+	v3f getPosition() const;
+
+	/// Gets the light's matrices.
+	const core::matrix4 &getViewMatrix() const;
+	const core::matrix4 &getProjectionMatrix() const;
+	core::matrix4 getViewProjMatrix();
+
+	/// Gets the light's far value.
+	f32 getMaxFarValue() const
+	{
+		return farPlane;
+	}
+
+
+	/// Gets the light's color.
+	const video::SColorf &getLightColor() const
+	{
+		return diffuseColor;
+	}
+
+	/// Sets the light's color.
+	void setLightColor(const video::SColorf &lightColor)
+	{
+		diffuseColor = lightColor;
+	}
+
+	/// Gets the shadow map resolution for this light.
+	u32 getMapResolution() const
+	{
+		return mapRes;
+	}
+
+	bool should_update_map_shadow{true};
+
+private:
+	void createSplitMatrices(const Camera *cam);
+
+	video::SColorf diffuseColor;
+
+	f32 farPlane;
+	u32 mapRes;
+
+	v3f pos;
+	v3f direction{0};
+	shadowFrustum shadow_frustum;
+};

src/client/shadows/dynamicshadowsrender.cpp

@@ -0,0 +1,539 @@
+/*
+Minetest
+Copyright (C) 2021 Liso <anlismon@gmail.com>
+
+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
+(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.
+
+You should have received a copy of the GNU Lesser 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 <cstring>
+#include "client/shadows/dynamicshadowsrender.h"
+#include "client/shadows/shadowsScreenQuad.h"
+#include "client/shadows/shadowsshadercallbacks.h"
+#include "settings.h"
+#include "filesys.h"
+#include "util/string.h"
+#include "client/shader.h"
+#include "client/client.h"
+#include "client/clientmap.h"
+
+ShadowRenderer::ShadowRenderer(IrrlichtDevice *device, Client *client) :
+		m_device(device), m_smgr(device->getSceneManager()),
+		m_driver(device->getVideoDriver()), m_client(client)
+{
+	m_shadows_enabled = true;
+
+	m_shadow_strength = g_settings->getFloat("shadow_strength");
+
+	m_shadow_map_max_distance = g_settings->getFloat("shadow_map_max_distance");
+
+	m_shadow_map_texture_size = g_settings->getFloat("shadow_map_texture_size");
+
+	m_shadow_map_texture_32bit = g_settings->getBool("shadow_map_texture_32bit");
+	m_shadow_map_colored = g_settings->getBool("shadow_map_color");
+	m_shadow_samples = g_settings->getS32("shadow_filters");
+	m_update_delta = g_settings->getFloat("shadow_update_time");
+}
+
+ShadowRenderer::~ShadowRenderer()
+{
+	if (m_shadow_depth_cb)
+		delete m_shadow_depth_cb;
+	if (m_shadow_mix_cb)
+		delete m_shadow_mix_cb;
+	m_shadow_node_array.clear();
+	m_light_list.clear();
+
+	if (shadowMapTextureDynamicObjects)
+		m_driver->removeTexture(shadowMapTextureDynamicObjects);
+
+	if (shadowMapTextureFinal)
+		m_driver->removeTexture(shadowMapTextureFinal);
+
+	if (shadowMapTextureColors)
+		m_driver->removeTexture(shadowMapTextureColors);
+
+	if (shadowMapClientMap)
+		m_driver->removeTexture(shadowMapClientMap);
+}
+
+void ShadowRenderer::initialize()
+{
+	auto *gpu = m_driver->getGPUProgrammingServices();
+
+	// we need glsl
+	if (m_shadows_enabled && gpu && m_driver->queryFeature(video::EVDF_ARB_GLSL)) {
+		createShaders();
+	} else {
+		m_shadows_enabled = false;
+
+		warningstream << "Shadows: GLSL Shader not supported on this system."
+			<< std::endl;
+		return;
+	}
+
+	m_texture_format = m_shadow_map_texture_32bit
+					   ? video::ECOLOR_FORMAT::ECF_R32F
+					   : video::ECOLOR_FORMAT::ECF_R16F;
+
+	m_texture_format_color = m_shadow_map_texture_32bit
+						 ? video::ECOLOR_FORMAT::ECF_G32R32F
+						 : video::ECOLOR_FORMAT::ECF_G16R16F;
+}
+
+
+float ShadowRenderer::getUpdateDelta() const
+{
+	return m_update_delta;
+}
+
+size_t ShadowRenderer::addDirectionalLight()
+{
+	m_light_list.emplace_back(m_shadow_map_texture_size,
+			v3f(0.f, 0.f, 0.f),
+			video::SColor(255, 255, 255, 255), m_shadow_map_max_distance);
+	return m_light_list.size() - 1;
+}
+
+DirectionalLight &ShadowRenderer::getDirectionalLight(u32 index)
+{
+	return m_light_list[index];
+}
+
+size_t ShadowRenderer::getDirectionalLightCount() const
+{
+	return m_light_list.size();
+}
+
+f32 ShadowRenderer::getMaxShadowFar() const
+{
+	if (!m_light_list.empty()) {
+		float wanted_range = m_client->getEnv().getClientMap().getWantedRange();
+
+		float zMax = m_light_list[0].getMaxFarValue() > wanted_range
+					     ? wanted_range
+					     : m_light_list[0].getMaxFarValue();
+		return zMax * MAP_BLOCKSIZE;
+	}
+	return 0.0f;
+}
+
+void ShadowRenderer::addNodeToShadowList(
+		scene::ISceneNode *node, E_SHADOW_MODE shadowMode)
+{
+	m_shadow_node_array.emplace_back(NodeToApply(node, shadowMode));
+}
+
+void ShadowRenderer::removeNodeFromShadowList(scene::ISceneNode *node)
+{
+	for (auto it = m_shadow_node_array.begin(); it != m_shadow_node_array.end();) {
+		if (it->node == node) {
+			it = m_shadow_node_array.erase(it);
+			break;
+		} else {
+			++it;
+		}
+	}
+}
+
+void ShadowRenderer::setClearColor(video::SColor ClearColor)
+{
+	m_clear_color = ClearColor;
+}
+
+void ShadowRenderer::update(video::ITexture *outputTarget)
+{
+	if (!m_shadows_enabled || m_smgr->getActiveCamera() == nullptr) {
+		m_smgr->drawAll();
+		return;
+	}
+
+	if (!shadowMapTextureDynamicObjects) {
+
+		shadowMapTextureDynamicObjects = getSMTexture(
+			std::string("shadow_dynamic_") + itos(m_shadow_map_texture_size),
+			m_texture_format, true);
+	}
+
+	if (!shadowMapClientMap) {
+
+		shadowMapClientMap = getSMTexture(
+			std::string("shadow_clientmap_") + itos(m_shadow_map_texture_size),
+			m_shadow_map_colored ? m_texture_format_color : m_texture_format,
+			true);
+	}
+
+	if (m_shadow_map_colored && !shadowMapTextureColors) {
+		shadowMapTextureColors = getSMTexture(
+			std::string("shadow_colored_") + itos(m_shadow_map_texture_size),
+			m_shadow_map_colored ? m_texture_format_color : m_texture_format,
+			true);
+	}
+
+	// The merge all shadowmaps texture
+	if (!shadowMapTextureFinal) {
+		video::ECOLOR_FORMAT frt;
+		if (m_shadow_map_texture_32bit) {
+			if (m_shadow_map_colored)
+				frt = video::ECOLOR_FORMAT::ECF_A32B32G32R32F;
+			else
+				frt = video::ECOLOR_FORMAT::ECF_R32F;
+		} else {
+			if (m_shadow_map_colored)
+				frt = video::ECOLOR_FORMAT::ECF_A16B16G16R16F;
+			else
+				frt = video::ECOLOR_FORMAT::ECF_R16F;
+		}
+		shadowMapTextureFinal = getSMTexture(
+			std::string("shadowmap_final_") + itos(m_shadow_map_texture_size),
+			frt, true);
+	}
+
+	if (!m_shadow_node_array.empty() && !m_light_list.empty()) {
+		// for every directional light:
+		for (DirectionalLight &light : m_light_list) {
+			// Static shader values.
+			m_shadow_depth_cb->MapRes = (f32)m_shadow_map_texture_size;
+			m_shadow_depth_cb->MaxFar = (f32)m_shadow_map_max_distance * BS;
+
+			// set the Render Target
+			// right now we can only render in usual RTT, not
+			// Depth texture is available in irrlicth maybe we
+			// should put some gl* fn here
+
+			if (light.should_update_map_shadow) {
+				light.should_update_map_shadow = false;
+
+				m_driver->setRenderTarget(shadowMapClientMap, true, true,
+						video::SColor(255, 255, 255, 255));
+				renderShadowMap(shadowMapClientMap, light);
+
+				if (m_shadow_map_colored) {
+					m_driver->setRenderTarget(shadowMapTextureColors,
+							true, false, video::SColor(255, 255, 255, 255));
+				}
+				renderShadowMap(shadowMapTextureColors, light,
+						scene::ESNRP_TRANSPARENT);
+				m_driver->setRenderTarget(0, false, false);
+			}
+
+			// render shadows for the n0n-map objects.
+			m_driver->setRenderTarget(shadowMapTextureDynamicObjects, true,
+					true, video::SColor(255, 255, 255, 255));
+			renderShadowObjects(shadowMapTextureDynamicObjects, light);
+			// clear the Render Target
+			m_driver->setRenderTarget(0, false, false);
+
+			// in order to avoid too many map shadow renders,
+			// we should make a second pass to mix clientmap shadows and
+			// entities shadows :(
+			m_screen_quad->getMaterial().setTexture(0, shadowMapClientMap);
+			// dynamic objs shadow texture.
+			if (m_shadow_map_colored)
+				m_screen_quad->getMaterial().setTexture(1, shadowMapTextureColors);
+			m_screen_quad->getMaterial().setTexture(2, shadowMapTextureDynamicObjects);
+
+			m_driver->setRenderTarget(shadowMapTextureFinal, false, false,
+					video::SColor(255, 255, 255, 255));
+			m_screen_quad->render(m_driver);
+			m_driver->setRenderTarget(0, false, false);
+
+		} // end for lights
+
+		// now render the actual MT render pass
+		m_driver->setRenderTarget(outputTarget, true, true, m_clear_color);
+		m_smgr->drawAll();
+
+		/* this code just shows shadows textures in screen and in ONLY for debugging*/
+		#if 0
+		// this is debug, ignore for now.
+		m_driver->draw2DImage(shadowMapTextureFinal,
+				core::rect<s32>(0, 50, 128, 128 + 50),
+				core::rect<s32>({0, 0}, shadowMapTextureFinal->getSize()));
+
+		m_driver->draw2DImage(shadowMapClientMap,
+				core::rect<s32>(0, 50 + 128, 128, 128 + 50 + 128),
+				core::rect<s32>({0, 0}, shadowMapTextureFinal->getSize()));
+		m_driver->draw2DImage(shadowMapTextureDynamicObjects,
+				core::rect<s32>(0, 128 + 50 + 128, 128,
+						128 + 50 + 128 + 128),
+				core::rect<s32>({0, 0}, shadowMapTextureDynamicObjects->getSize()));
+
+		if (m_shadow_map_colored) {
+
+			m_driver->draw2DImage(shadowMapTextureColors,
+					core::rect<s32>(128,128 + 50 + 128 + 128,
+							128 + 128, 128 + 50 + 128 + 128 + 128),
+					core::rect<s32>({0, 0}, shadowMapTextureColors->getSize()));
+		}
+		#endif
+		m_driver->setRenderTarget(0, false, false);
+	}
+}
+
+
+video::ITexture *ShadowRenderer::getSMTexture(const std::string &shadow_map_name,
+		video::ECOLOR_FORMAT texture_format, bool force_creation)
+{
+	if (force_creation) {
+		return m_driver->addRenderTargetTexture(
+				core::dimension2du(m_shadow_map_texture_size,
+						m_shadow_map_texture_size),
+				shadow_map_name.c_str(), texture_format);
+	}
+
+	return m_driver->getTexture(shadow_map_name.c_str());
+}
+
+void ShadowRenderer::renderShadowMap(video::ITexture *target,
+		DirectionalLight &light, scene::E_SCENE_NODE_RENDER_PASS pass)
+{
+	m_driver->setTransform(video::ETS_VIEW, light.getViewMatrix());
+	m_driver->setTransform(video::ETS_PROJECTION, light.getProjectionMatrix());
+
+	// Operate on the client map
+	for (const auto &shadow_node : m_shadow_node_array) {
+		if (strcmp(shadow_node.node->getName(), "ClientMap") != 0)
+			continue;
+
+		ClientMap *map_node = static_cast<ClientMap *>(shadow_node.node);
+
+		video::SMaterial material;
+		if (map_node->getMaterialCount() > 0) {
+			// we only want the first material, which is the one with the albedo info
+			material = map_node->getMaterial(0);
+		}
+
+		material.BackfaceCulling = false;
+		material.FrontfaceCulling = true;
+		material.PolygonOffsetFactor = 4.0f;
+		material.PolygonOffsetDirection = video::EPO_BACK;
+		//material.PolygonOffsetDepthBias = 1.0f/4.0f;
+		//material.PolygonOffsetSlopeScale = -1.f;
+
+		if (m_shadow_map_colored && pass != scene::ESNRP_SOLID)
+			material.MaterialType = (video::E_MATERIAL_TYPE) depth_shader_trans;
+		else
+			material.MaterialType = (video::E_MATERIAL_TYPE) depth_shader;
+
+		// FIXME: I don't think this is needed here
+		map_node->OnAnimate(m_device->getTimer()->getTime());
+
+		m_driver->setTransform(video::ETS_WORLD,
+				map_node->getAbsoluteTransformation());
+
+		map_node->renderMapShadows(m_driver, material, pass);
+		break;
+	}
+}
+
+void ShadowRenderer::renderShadowObjects(
+		video::ITexture *target, DirectionalLight &light)
+{
+	m_driver->setTransform(video::ETS_VIEW, light.getViewMatrix());
+	m_driver->setTransform(video::ETS_PROJECTION, light.getProjectionMatrix());
+
+	for (const auto &shadow_node : m_shadow_node_array) {
+		// we only take care of the shadow casters
+		if (shadow_node.shadowMode == ESM_RECEIVE ||
+				strcmp(shadow_node.node->getName(), "ClientMap") == 0)
+			continue;
+
+		// render other objects
+		u32 n_node_materials = shadow_node.node->getMaterialCount();
+		std::vector<s32> BufferMaterialList;
+		std::vector<std::pair<bool, bool>> BufferMaterialCullingList;
+		BufferMaterialList.reserve(n_node_materials);
+		BufferMaterialCullingList.reserve(n_node_materials);
+
+		// backup materialtype for each material
+		// (aka shader)
+		// and replace it by our "depth" shader
+		for (u32 m = 0; m < n_node_materials; m++) {
+			auto &current_mat = shadow_node.node->getMaterial(m);
+
+			BufferMaterialList.push_back(current_mat.MaterialType);
+			current_mat.MaterialType =
+					(video::E_MATERIAL_TYPE)depth_shader;
+
+			current_mat.setTexture(3, shadowMapTextureFinal);
+
+			BufferMaterialCullingList.emplace_back(
+				(bool)current_mat.BackfaceCulling, (bool)current_mat.FrontfaceCulling);
+
+			current_mat.BackfaceCulling = true;
+			current_mat.FrontfaceCulling = false;
+			current_mat.PolygonOffsetFactor = 1.0f/2048.0f;
+			current_mat.PolygonOffsetDirection = video::EPO_BACK;
+			//current_mat.PolygonOffsetDepthBias = 1.0 * 2.8e-6;
+			//current_mat.PolygonOffsetSlopeScale = -1.f;
+		}
+
+		m_driver->setTransform(video::ETS_WORLD,
+				shadow_node.node->getAbsoluteTransformation());
+		shadow_node.node->render();
+
+		// restore the material.
+
+		for (u32 m = 0; m < n_node_materials; m++) {
+			auto &current_mat = shadow_node.node->getMaterial(m);
+
+			current_mat.MaterialType = (video::E_MATERIAL_TYPE) BufferMaterialList[m];
+
+			current_mat.BackfaceCulling = BufferMaterialCullingList[m].first;
+			current_mat.FrontfaceCulling = BufferMaterialCullingList[m].second;
+		}
+
+	} // end for caster shadow nodes
+}
+
+void ShadowRenderer::mixShadowsQuad()
+{
+}
+
+/*
+ * @Liso's disclaimer ;) This function loads the Shadow Mapping Shaders.
+ * I used a custom loader because I couldn't figure out how to use the base
+ * Shaders system with custom IShaderConstantSetCallBack without messing up the
+ * code too much. If anyone knows how to integrate this with the standard MT
+ * shaders, please feel free to change it.
+ */
+
+void ShadowRenderer::createShaders()
+{
+	video::IGPUProgrammingServices *gpu = m_driver->getGPUProgrammingServices();
+
+	if (depth_shader == -1) {
+		std::string depth_shader_vs = getShaderPath("shadow_shaders", "pass1_vertex.glsl");
+		if (depth_shader_vs.empty()) {
+			m_shadows_enabled = false;
+			errorstream << "Error shadow mapping vs shader not found." << std::endl;
+			return;
+		}
+		std::string depth_shader_fs = getShaderPath("shadow_shaders", "pass1_fragment.glsl");
+		if (depth_shader_fs.empty()) {
+			m_shadows_enabled = false;
+			errorstream << "Error shadow mapping fs shader not found." << std::endl;
+			return;
+		}
+		m_shadow_depth_cb = new ShadowDepthShaderCB();
+
+		depth_shader = gpu->addHighLevelShaderMaterial(
+				readShaderFile(depth_shader_vs).c_str(), "vertexMain",
+				video::EVST_VS_1_1,
+				readShaderFile(depth_shader_fs).c_str(), "pixelMain",
+				video::EPST_PS_1_2, m_shadow_depth_cb);
+
+		if (depth_shader == -1) {
+			// upsi, something went wrong loading shader.
+			delete m_shadow_depth_cb;
+			m_shadows_enabled = false;
+			errorstream << "Error compiling shadow mapping shader." << std::endl;
+			return;
+		}
+
+		// HACK, TODO: investigate this better
+		// Grab the material renderer once more so minetest doesn't crash
+		// on exit
+		m_driver->getMaterialRenderer(depth_shader)->grab();
+	}
+
+	if (mixcsm_shader == -1) {
+		std::string depth_shader_vs = getShaderPath("shadow_shaders", "pass2_vertex.glsl");
+		if (depth_shader_vs.empty()) {
+			m_shadows_enabled = false;
+			errorstream << "Error cascade shadow mapping fs shader not found." << std::endl;
+			return;
+		}
+
+		std::string depth_shader_fs = getShaderPath("shadow_shaders", "pass2_fragment.glsl");
+		if (depth_shader_fs.empty()) {
+			m_shadows_enabled = false;
+			errorstream << "Error cascade shadow mapping fs shader not found." << std::endl;
+			return;
+		}
+		m_shadow_mix_cb = new shadowScreenQuadCB();
+		m_screen_quad = new shadowScreenQuad();
+		mixcsm_shader = gpu->addHighLevelShaderMaterial(
+				readShaderFile(depth_shader_vs).c_str(), "vertexMain",
+				video::EVST_VS_1_1,
+				readShaderFile(depth_shader_fs).c_str(), "pixelMain",
+				video::EPST_PS_1_2, m_shadow_mix_cb);
+
+		m_screen_quad->getMaterial().MaterialType =
+				(video::E_MATERIAL_TYPE)mixcsm_shader;
+
+		if (mixcsm_shader == -1) {
+			// upsi, something went wrong loading shader.
+			delete m_shadow_mix_cb;
+			delete m_screen_quad;
+			m_shadows_enabled = false;
+			errorstream << "Error compiling cascade shadow mapping shader." << std::endl;
+			return;
+		}
+
+		// HACK, TODO: investigate this better
+		// Grab the material renderer once more so minetest doesn't crash
+		// on exit
+		m_driver->getMaterialRenderer(mixcsm_shader)->grab();
+	}
+
+	if (m_shadow_map_colored && depth_shader_trans == -1) {
+		std::string depth_shader_vs = getShaderPath("shadow_shaders", "pass1_trans_vertex.glsl");
+		if (depth_shader_vs.empty()) {
+			m_shadows_enabled = false;
+			errorstream << "Error shadow mapping vs shader not found." << std::endl;
+			return;
+		}
+		std::string depth_shader_fs = getShaderPath("shadow_shaders", "pass1_trans_fragment.glsl");
+		if (depth_shader_fs.empty()) {
+			m_shadows_enabled = false;
+			errorstream << "Error shadow mapping fs shader not found." << std::endl;
+			return;
+		}
+		m_shadow_depth_trans_cb = new ShadowDepthShaderCB();
+
+		depth_shader_trans = gpu->addHighLevelShaderMaterial(
+				readShaderFile(depth_shader_vs).c_str(), "vertexMain",
+				video::EVST_VS_1_1,
+				readShaderFile(depth_shader_fs).c_str(), "pixelMain",
+				video::EPST_PS_1_2, m_shadow_depth_trans_cb);
+
+		if (depth_shader_trans == -1) {
+			// upsi, something went wrong loading shader.
+			delete m_shadow_depth_trans_cb;
+			m_shadow_map_colored = false;
+			m_shadows_enabled = false;
+			errorstream << "Error compiling colored shadow mapping shader." << std::endl;
+			return;
+		}
+
+		// HACK, TODO: investigate this better
+		// Grab the material renderer once more so minetest doesn't crash
+		// on exit
+		m_driver->getMaterialRenderer(depth_shader_trans)->grab();
+	}
+}
+
+std::string ShadowRenderer::readShaderFile(const std::string &path)
+{
+	std::string prefix;
+	if (m_shadow_map_colored)
+		prefix.append("#define COLORED_SHADOWS 1\n");
+
+	std::string content;
+	fs::ReadFile(path, content);
+
+	return prefix + content;
+}

src/client/shadows/dynamicshadowsrender.h

@@ -0,0 +1,146 @@
+/*
+Minetest
+Copyright (C) 2021 Liso <anlismon@gmail.com>
+
+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
+(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.
+
+You should have received a copy of the GNU Lesser 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.
+*/
+
+#pragma once
+
+#include <string>
+#include <vector>
+#include "irrlichttypes_extrabloated.h"
+#include "client/shadows/dynamicshadows.h"
+
+class ShadowDepthShaderCB;
+class shadowScreenQuad;
+class shadowScreenQuadCB;
+
+enum E_SHADOW_MODE : u8
+{
+	ESM_RECEIVE = 0,
+	ESM_BOTH,
+};
+
+struct NodeToApply
+{
+	NodeToApply(scene::ISceneNode *n,
+			E_SHADOW_MODE m = E_SHADOW_MODE::ESM_BOTH) :
+			node(n),
+			shadowMode(m){};
+	bool operator<(const NodeToApply &other) const { return node < other.node; };
+
+	scene::ISceneNode *node;
+
+	E_SHADOW_MODE shadowMode{E_SHADOW_MODE::ESM_BOTH};
+	bool dirty{false};
+};
+
+class ShadowRenderer
+{
+public:
+	ShadowRenderer(IrrlichtDevice *device, Client *client);
+
+	~ShadowRenderer();
+
+	void initialize();
+
+	/// Adds a directional light shadow map (Usually just one (the sun) except in
+	/// Tattoine ).
+	size_t addDirectionalLight();
+	DirectionalLight &getDirectionalLight(u32 index = 0);
+	size_t getDirectionalLightCount() const;
+	f32 getMaxShadowFar() const;
+
+	float getUpdateDelta() const;
+	/// Adds a shadow to the scene node.
+	/// The shadow mode can be ESM_BOTH, or ESM_RECEIVE.
+	/// ESM_BOTH casts and receives shadows
+	/// ESM_RECEIVE only receives but does not cast shadows.
+	///
+	void addNodeToShadowList(scene::ISceneNode *node,
+			E_SHADOW_MODE shadowMode = ESM_BOTH);
+	void removeNodeFromShadowList(scene::ISceneNode *node);
+
+	void setClearColor(video::SColor ClearColor);
+
+	void update(video::ITexture *outputTarget = nullptr);
+
+	video::ITexture *get_texture()
+	{
+		return shadowMapTextureFinal;
+	}
+
+
+	bool is_active() const { return m_shadows_enabled; }
+	void setTimeOfDay(float isDay) { m_time_day = isDay; };
+
+	s32 getShadowSamples() const { return m_shadow_samples; }
+	float getShadowStrength() const { return m_shadow_strength; }
+	float getTimeOfDay() const { return m_time_day; }
+
+private:
+	video::ITexture *getSMTexture(const std::string &shadow_map_name,
+			video::ECOLOR_FORMAT texture_format,
+			bool force_creation = false);
+
+	void renderShadowMap(video::ITexture *target, DirectionalLight &light,
+			scene::E_SCENE_NODE_RENDER_PASS pass =
+					scene::ESNRP_SOLID);
+	void renderShadowObjects(video::ITexture *target, DirectionalLight &light);
+	void mixShadowsQuad();
+
+	// a bunch of variables
+	IrrlichtDevice *m_device{nullptr};
+	scene::ISceneManager *m_smgr{nullptr};
+	video::IVideoDriver *m_driver{nullptr};
+	Client *m_client{nullptr};
+	video::ITexture *shadowMapClientMap{nullptr};
+	video::ITexture *shadowMapTextureFinal{nullptr};
+	video::ITexture *shadowMapTextureDynamicObjects{nullptr};
+	video::ITexture *shadowMapTextureColors{nullptr};
+	video::SColor m_clear_color{0x0};
+
+	std::vector<DirectionalLight> m_light_list;
+	std::vector<NodeToApply> m_shadow_node_array;
+
+	float m_shadow_strength;
+	float m_shadow_map_max_distance;
+	float m_shadow_map_texture_size;
+	float m_time_day{0.0f};
+	float m_update_delta;
+	int m_shadow_samples;
+	bool m_shadow_map_texture_32bit;
+	bool m_shadows_enabled;
+	bool m_shadow_map_colored;
+
+	video::ECOLOR_FORMAT m_texture_format{video::ECOLOR_FORMAT::ECF_R16F};
+	video::ECOLOR_FORMAT m_texture_format_color{video::ECOLOR_FORMAT::ECF_R16G16};
+
+	// Shadow Shader stuff
+
+	void createShaders();
+	std::string readShaderFile(const std::string &path);
+
+	s32 depth_shader{-1};
+	s32 depth_shader_trans{-1};
+	s32 mixcsm_shader{-1};
+
+	ShadowDepthShaderCB *m_shadow_depth_cb{nullptr};
+	ShadowDepthShaderCB *m_shadow_depth_trans_cb{nullptr};
+
+	shadowScreenQuad *m_screen_quad{nullptr};
+	shadowScreenQuadCB *m_shadow_mix_cb{nullptr};
+};

src/client/shadows/shadowsScreenQuad.cpp

@@ -0,0 +1,67 @@
+/*
+Minetest
+Copyright (C) 2021 Liso <anlismon@gmail.com>
+
+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
+(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.
+
+You should have received a copy of the GNU Lesser 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 "shadowsScreenQuad.h"
+
+shadowScreenQuad::shadowScreenQuad()
+{
+	Material.Wireframe = false;
+	Material.Lighting = false;
+
+	video::SColor color(0x0);
+	Vertices[0] = video::S3DVertex(
+			-1.0f, -1.0f, 0.0f, 0, 0, 1, color, 0.0f, 1.0f);
+	Vertices[1] = video::S3DVertex(
+			-1.0f, 1.0f, 0.0f, 0, 0, 1, color, 0.0f, 0.0f);
+	Vertices[2] = video::S3DVertex(
+			1.0f, 1.0f, 0.0f, 0, 0, 1, color, 1.0f, 0.0f);
+	Vertices[3] = video::S3DVertex(
+			1.0f, -1.0f, 0.0f, 0, 0, 1, color, 1.0f, 1.0f);
+	Vertices[4] = video::S3DVertex(
+			-1.0f, -1.0f, 0.0f, 0, 0, 1, color, 0.0f, 1.0f);
+	Vertices[5] = video::S3DVertex(
+			1.0f, 1.0f, 0.0f, 0, 0, 1, color, 1.0f, 0.0f);
+}
+
+void shadowScreenQuad::render(video::IVideoDriver *driver)
+{
+	u16 indices[6] = {0, 1, 2, 3, 4, 5};
+	driver->setMaterial(Material);
+	driver->setTransform(video::ETS_WORLD, core::matrix4());
+	driver->drawIndexedTriangleList(&Vertices[0], 6, &indices[0], 2);
+}
+
+void shadowScreenQuadCB::OnSetConstants(
+		video::IMaterialRendererServices *services, s32 userData)
+{
+	s32 TextureId = 0;
+	services->setPixelShaderConstant(
+		services->getPixelShaderConstantID("ShadowMapClientMap"),
+		&TextureId, 1);
+
+	TextureId = 1;
+	services->setPixelShaderConstant(
+		services->getPixelShaderConstantID("ShadowMapClientMapTraslucent"),
+		&TextureId, 1);
+
+	TextureId = 2;
+	services->setPixelShaderConstant(
+		services->getPixelShaderConstantID("ShadowMapSamplerdynamic"),
+		&TextureId, 1);
+}

src/client/shadows/shadowsScreenQuad.h

@@ -0,0 +1,45 @@
+/*
+Minetest
+Copyright (C) 2021 Liso <anlismon@gmail.com>
+
+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
+(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.
+
+You should have received a copy of the GNU Lesser 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.
+*/
+
+#pragma once
+#include "irrlichttypes_extrabloated.h"
+#include <IMaterialRendererServices.h>
+#include <IShaderConstantSetCallBack.h>
+
+class shadowScreenQuad
+{
+public:
+	shadowScreenQuad();
+
+	void render(video::IVideoDriver *driver);
+	video::SMaterial &getMaterial() { return Material; }
+
+private:
+	video::S3DVertex Vertices[6];
+	video::SMaterial Material;
+};
+
+class shadowScreenQuadCB : public video::IShaderConstantSetCallBack
+{
+public:
+	shadowScreenQuadCB(){};
+
+	virtual void OnSetConstants(video::IMaterialRendererServices *services,
+			s32 userData);
+};

src/client/shadows/shadowsshadercallbacks.cpp

@@ -0,0 +1,44 @@
+/*
+Minetest
+Copyright (C) 2021 Liso <anlismon@gmail.com>
+
+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
+(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.
+
+You should have received a copy of the GNU Lesser 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 "client/shadows/shadowsshadercallbacks.h"
+
+void ShadowDepthShaderCB::OnSetConstants(
+		video::IMaterialRendererServices *services, s32 userData)
+{
+	video::IVideoDriver *driver = services->getVideoDriver();
+
+	core::matrix4 lightMVP = driver->getTransform(video::ETS_PROJECTION);
+	lightMVP *= driver->getTransform(video::ETS_VIEW);
+	lightMVP *= driver->getTransform(video::ETS_WORLD);
+
+	services->setVertexShaderConstant(
+		services->getPixelShaderConstantID("LightMVP"),
+		lightMVP.pointer(), 16);
+
+	services->setVertexShaderConstant(
+		services->getPixelShaderConstantID("MapResolution"), &MapRes, 1);
+	services->setVertexShaderConstant(
+		services->getPixelShaderConstantID("MaxFar"), &MaxFar, 1);
+
+	s32 TextureId = 0;
+	services->setPixelShaderConstant(
+		services->getPixelShaderConstantID("ColorMapSampler"), &TextureId,
+		1);
+}

src/client/shadows/shadowsshadercallbacks.h

@@ -0,0 +1,34 @@
+/*
+Minetest
+Copyright (C) 2021 Liso <anlismon@gmail.com>
+
+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
+(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.
+
+You should have received a copy of the GNU Lesser 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.
+*/
+
+#pragma once
+#include "irrlichttypes_extrabloated.h"
+#include <IMaterialRendererServices.h>
+#include <IShaderConstantSetCallBack.h>
+
+class ShadowDepthShaderCB : public video::IShaderConstantSetCallBack
+{
+public:
+	void OnSetMaterial(const video::SMaterial &material) override {}
+
+	void OnSetConstants(video::IMaterialRendererServices *services,
+			s32 userData) override;
+
+	f32 MaxFar{2048.0f}, MapRes{1024.0f};
+};

src/client/sky.cpp

@@ -122,7 +122,14 @@ Sky::Sky(s32 id, RenderingEngine *rendering_engine, ITextureSource *tsrc, IShade
 		m_materials[i].Lighting = true;
 		m_materials[i].MaterialType = video::EMT_SOLID;
 	}
+
 	m_directional_colored_fog = g_settings->getBool("directional_colored_fog");
+
+	if (g_settings->getBool("enable_dynamic_shadows")) {
+		float val = g_settings->getFloat("shadow_sky_body_orbit_tilt");
+		m_sky_body_orbit_tilt = rangelim(val, 0.0f, 60.0f);
+	}
+
 	setStarCount(1000, true);
 }
 
@@ -175,17 +182,7 @@ void Sky::render()
 		video::SColorf mooncolor_f(0.50, 0.57, 0.65, 1);
 		video::SColorf mooncolor2_f(0.85, 0.875, 0.9, 1);
 
-		float nightlength = 0.415;
-		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;*/
+		float wicked_time_of_day = getWickedTimeOfDay(m_time_of_day);
 
 		video::SColor suncolor = suncolor_f.toSColor();
 		video::SColor suncolor2 = suncolor2_f.toSColor();
@@ -739,10 +736,15 @@ void Sky::place_sky_body(
 	* day_position: turn the body around the Z axis, to place it depending of the time of the day
 	*/
 {
+	v3f centrum(0, 0, -1);
+	centrum.rotateXZBy(horizon_position);
+	centrum.rotateXYBy(day_position);
+	centrum.rotateYZBy(m_sky_body_orbit_tilt);
 	for (video::S3DVertex &vertex : vertices) {
 		// Body is directed to -Z (south) by default
 		vertex.Pos.rotateXZBy(horizon_position);
 		vertex.Pos.rotateXYBy(day_position);
+		vertex.Pos.Z += centrum.Z;
 	}
 }
 
@@ -931,3 +933,17 @@ void Sky::setSkyDefaults()
 	m_moon_params = sky_defaults.getMoonDefaults();
 	m_star_params = sky_defaults.getStarDefaults();
 }
+
+float getWickedTimeOfDay(float time_of_day)
+{
+	float nightlength = 0.415f;
+	float wn = nightlength / 2;
+	float wicked_time_of_day = 0;
+	if (time_of_day > wn && time_of_day < 1.0f - wn)
+		wicked_time_of_day = (time_of_day - wn) / (1.0f - wn * 2) * 0.5f + 0.25f;
+	else if (time_of_day < 0.5f)
+		wicked_time_of_day = time_of_day / wn * 0.25f;
+	else
+		wicked_time_of_day = 1.0f - ((1.0f - time_of_day) / wn * 0.25f);
+	return wicked_time_of_day;
+}

src/client/sky.h

@@ -105,6 +105,8 @@ public:
 		ITextureSource *tsrc);
 	const video::SColorf &getCurrentStarColor() const { return m_star_color; }
 
+	float getSkyBodyOrbitTilt() const { return m_sky_body_orbit_tilt; }
+
 private:
 	aabb3f m_box;
 	video::SMaterial m_materials[SKY_MATERIAL_COUNT];
@@ -159,6 +161,7 @@ private:
 	bool m_directional_colored_fog;
 	bool m_in_clouds = true; // Prevent duplicating bools to remember old values
 	bool m_enable_shaders = false;
+	float m_sky_body_orbit_tilt = 0.0f;
 
 	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);
@@ -205,3 +208,7 @@ private:
 		float horizon_position,	float day_position);
 	void setSkyDefaults();
 };
+
+// calculates value for sky body positions for the given observed time of day
+// this is used to draw both Sun/Moon and shadows
+float getWickedTimeOfDay(float time_of_day);

src/client/wieldmesh.cpp

@@ -33,6 +33,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "util/numeric.h"
 #include <map>
 #include <IMeshManipulator.h>
+#include "client/renderingengine.h"
 
 #define WIELD_SCALE_FACTOR 30.0
 #define WIELD_SCALE_FACTOR_EXTRUDED 40.0
@@ -220,11 +221,18 @@ WieldMeshSceneNode::WieldMeshSceneNode(scene::ISceneManager *mgr, s32 id, bool l
 	m_meshnode->setReadOnlyMaterials(false);
 	m_meshnode->setVisible(false);
 	dummymesh->drop(); // m_meshnode grabbed it
+
+	m_shadow = RenderingEngine::get_shadow_renderer();
 }
 
 WieldMeshSceneNode::~WieldMeshSceneNode()
 {
 	sanity_check(g_extrusion_mesh_cache);
+
+	// Remove node from shadow casters
+	if (m_shadow)
+		m_shadow->removeNodeFromShadowList(m_meshnode);
+
 	if (g_extrusion_mesh_cache->drop())
 		g_extrusion_mesh_cache = nullptr;
 }
@@ -527,6 +535,10 @@ void WieldMeshSceneNode::changeToMesh(scene::IMesh *mesh)
 	// need to normalize normals when lighting is enabled (because of setScale())
 	m_meshnode->setMaterialFlag(video::EMF_NORMALIZE_NORMALS, m_lighting);
 	m_meshnode->setVisible(true);
+
+	// Add mesh to shadow caster
+	if (m_shadow)
+		m_shadow->addNodeToShadowList(m_meshnode);
 }
 
 void getItemMesh(Client *client, const ItemStack &item, ItemMesh *result)

src/client/wieldmesh.h

@@ -27,6 +27,7 @@ struct ItemStack;
 class Client;
 class ITextureSource;
 struct ContentFeatures;
+class ShadowRenderer;
 
 /*!
  * Holds color information of an item mesh's buffer.
@@ -124,6 +125,8 @@ private:
 	// so this variable is just required so we can implement
 	// getBoundingBox() and is set to an empty box.
 	aabb3f m_bounding_box;
+
+	ShadowRenderer *m_shadow;
 };
 
 void getItemMesh(Client *client, const ItemStack &item, ItemMesh *result);

src/defaultsettings.cpp

@@ -262,6 +262,18 @@ void set_default_settings()
 	settings->setDefault("enable_waving_leaves", "false");
 	settings->setDefault("enable_waving_plants", "false");
 
+	// Effects Shadows
+	settings->setDefault("enable_dynamic_shadows", "false");
+	settings->setDefault("shadow_strength", "0.2");
+	settings->setDefault("shadow_map_max_distance", "200.0");
+	settings->setDefault("shadow_map_texture_size", "2048");
+	settings->setDefault("shadow_map_texture_32bit", "true");
+	settings->setDefault("shadow_map_color", "false");
+	settings->setDefault("shadow_filters", "1");
+	settings->setDefault("shadow_poisson_filter", "true");
+	settings->setDefault("shadow_update_time", "0.2");
+	settings->setDefault("shadow_soft_radius", "1.0");
+	settings->setDefault("shadow_sky_body_orbit_tilt", "0.0");
 
 	// Input
 	settings->setDefault("invert_mouse", "false");