Improve lighting of entities.

Pass correct natural & artificial light to the shaders
Use natural/artificial light ratio for correct rendering of shadows

src/client/content_cao.cpp

@@ -864,7 +864,8 @@ void GenericCAO::updateLight(u32 day_night_ratio)
 	if (m_glow < 0)
 		return;
 
-	u8 light_at_pos = 0;
+	u16 light_at_pos = 0;
+	u8 light_at_pos_intensity = 0;
 	bool pos_ok = false;
 
 	v3s16 pos[3];
@@ -873,28 +874,33 @@ void GenericCAO::updateLight(u32 day_night_ratio)
 		bool this_ok;
 		MapNode n = m_env->getMap().getNode(pos[i], &this_ok);
 		if (this_ok) {
-			u8 this_light = n.getLightBlend(day_night_ratio, m_client->ndef());
-			light_at_pos = MYMAX(light_at_pos, this_light);
+			u16 this_light = getInteriorLight(n, 0, m_client->ndef());
+			u8 this_light_intensity = MYMAX(this_light & 0xFF, (this_light >> 8) && 0xFF);
+			if (this_light_intensity > light_at_pos_intensity) {
+				light_at_pos = this_light;
+				light_at_pos_intensity = this_light_intensity;
+			}
 			pos_ok = true;
 		}
 	}
 	if (!pos_ok)
-		light_at_pos = blend_light(day_night_ratio, LIGHT_SUN, 0);
+		light_at_pos = LIGHT_SUN;
+
+	video::SColor light = encode_light(light_at_pos, m_glow);
+	if (!m_enable_shaders)
+		final_color_blend(&light, light_at_pos, day_night_ratio);
 
-	u8 light = decode_light(light_at_pos + m_glow);
 	if (light != m_last_light) {
 		m_last_light = light;
 		setNodeLight(light);
 	}
 }
 
-void GenericCAO::setNodeLight(u8 light)
+void GenericCAO::setNodeLight(const video::SColor &light_color)
 {
-	video::SColor color(255, light, light, light);
-
 	if (m_prop.visual == "wielditem" || m_prop.visual == "item") {
 		if (m_wield_meshnode)
-			m_wield_meshnode->setNodeLightColor(color);
+			m_wield_meshnode->setNodeLightColor(light_color);
 		return;
 	}
 
@@ -906,7 +912,7 @@ void GenericCAO::setNodeLight(u8 light)
 			scene::IMesh *mesh = m_meshnode->getMesh();
 			for (u32 i = 0; i < mesh->getMeshBufferCount(); ++i) {
 				scene::IMeshBuffer *buf = mesh->getMeshBuffer(i);
-				buf->getMaterial().EmissiveColor = color;
+				buf->getMaterial().EmissiveColor = light_color;
 			}
 		} else {
 			scene::ISceneNode *node = getSceneNode();
@@ -915,16 +921,16 @@ void GenericCAO::setNodeLight(u8 light)
 
 			for (u32 i = 0; i < node->getMaterialCount(); ++i) {
 				video::SMaterial &material = node->getMaterial(i);
-				material.EmissiveColor = color;
+				material.EmissiveColor = light_color;
 			}
 		}
 	} else {
 		if (m_meshnode) {
-			setMeshColor(m_meshnode->getMesh(), color);
+			setMeshColor(m_meshnode->getMesh(), light_color);
 		} else if (m_animated_meshnode) {
-			setAnimatedMeshColor(m_animated_meshnode, color);
+			setAnimatedMeshColor(m_animated_meshnode, light_color);
 		} else if (m_spritenode) {
-			m_spritenode->setColor(color);
+			m_spritenode->setColor(light_color);
 		}
 	}
 }

src/client/content_cao.h

@@ -125,7 +125,7 @@ private:
 	std::string m_current_texture_modifier = "";
 	bool m_visuals_expired = false;
 	float m_step_distance_counter = 0.0f;
-	u8 m_last_light = 255;
+	video::SColor m_last_light = video::SColor(0xFFFFFFFF);
 	bool m_is_visible = false;
 	s8 m_glow = 0;
 	// Material
@@ -245,7 +245,7 @@ public:
 
 	void updateLight(u32 day_night_ratio);
 
-	void setNodeLight(u8 light);
+	void setNodeLight(const video::SColor &light);
 
 	/* Get light position(s).
 	 * returns number of positions written into pos[], which must have space

src/client/wieldmesh.cpp

@@ -515,8 +515,9 @@ void WieldMeshSceneNode::setNodeLightColor(video::SColor color)
 			material.EmissiveColor = color;
 		}
 	}
-
-	setColor(color);
+	else {
+		setColor(color);
+	}
 }
 
 void WieldMeshSceneNode::render()