Add hardware node coloring. Includes:

- Increase ContentFeatures serialization version
- Color property and palettes for nodes
- paramtype2 = "color", "colored facedir" or "colored wallmounted"

src/mapblock_mesh.h

@@ -156,8 +156,8 @@ private:
 	// Animation info: day/night transitions
 	// Last daynight_ratio value passed to animate()
 	u32 m_last_daynight_ratio;
-	// For each meshbuffer, maps vertex indices to (day,night) pairs
-	std::map<u32, std::map<u32, std::pair<u8, u8> > > m_daynight_diffs;
+	// For each meshbuffer, stores pre-baked colors of sunlit vertices
+	std::map<u32, std::map<u32, video::SColor > > m_daynight_diffs;
 
 	// Camera offset info -> do we have to translate the mesh?
 	v3s16 m_camera_offset;
@@ -192,28 +192,53 @@ struct MeshCollector
 	void append(const TileSpec &material,
 			const video::S3DVertex *vertices, u32 numVertices,
 			const u16 *indices, u32 numIndices,
-			v3f pos, video::SColor c);
+			v3f pos, video::SColor c, u8 light_source);
 };
 
-// This encodes
-//   alpha in the A channel of the returned SColor
-//   day light (0-255) in the R channel of the returned SColor
-//   night light (0-255) in the G channel of the returned SColor
-//   light source (0-255) in the B channel of the returned SColor
-inline video::SColor MapBlock_LightColor(u8 alpha, u16 light, u8 light_source=0)
-{
-	return video::SColor(alpha, (light & 0xff), (light >> 8), light_source);
-}
+/*!
+ * Encodes light and color of a node.
+ * The result is not the final color, but a
+ * half-baked vertex color.
+ *
+ * \param light the first 8 bits are day light,
+ * the last 8 bits are night light
+ * \param color the node's color
+ * \param emissive_light amount of light the surface emits,
+ * from 0 to LIGHT_SUN.
+ */
+video::SColor encode_light_and_color(u16 light, const video::SColor &color,
+	u8 emissive_light);
 
 // Compute light at node
 u16 getInteriorLight(MapNode n, s32 increment, INodeDefManager *ndef);
 u16 getFaceLight(MapNode n, MapNode n2, v3s16 face_dir, INodeDefManager *ndef);
 u16 getSmoothLight(v3s16 p, v3s16 corner, MeshMakeData *data);
 
-// Converts from day + night color values (0..255)
-// and a given daynight_ratio to the final SColor shown on screen.
-void finalColorBlend(video::SColor& result,
-		u8 day, u8 night, u32 daynight_ratio);
+/*!
+ * Returns the sunlight's color from the current
+ * day-night ratio.
+ */
+void get_sunlight_color(video::SColorf *sunlight, u32 daynight_ratio);
+
+/*!
+ * Gives the final  SColor shown on screen.
+ *
+ * \param result output color
+ * \param light first 8 bits are day light, second 8 bits are
+ * night light
+ */
+void final_color_blend(video::SColor *result,
+		u16 light, u32 daynight_ratio);
+
+/*!
+ * Gives the final  SColor shown on screen.
+ *
+ * \param result output color
+ * \param data the half-baked vertex color
+ * \param dayLight color of the sunlight
+ */
+void final_color_blend(video::SColor *result,
+		const video::SColor &data, const video::SColorf &dayLight);
 
 // Retrieves the TileSpec of a face of a node
 // Adds MATERIAL_FLAG_CRACK if the node is cracked