Restore finalColorBlend implementation in shaders.

client/shaders/nodes_shader/opengl_vertex.glsl

@@ -97,5 +97,31 @@ void main(void)
 	eyeVec = (gl_ModelViewMatrix * gl_Vertex).xyz;
 	tsEyeVec = eyeVec * tbnMatrix;
 
-	gl_FrontColor = gl_BackColor = gl_Color;
+	vec4 color;
+	float day = gl_Color.r;
+	float night = gl_Color.g;
+	float light_source = gl_Color.b;
+
+	float rg = mix(night, day, dayNightRatio);
+	rg += light_source * 2.5; // Make light sources brighter
+	float b = rg;
+
+	// Moonlight is blue
+	b += (day - night) / 13.0;
+	rg -= (day - night) / 23.0;
+
+	// Emphase blue a bit in darker places
+	// See C++ implementation in mapblock_mesh.cpp finalColorBlend()
+	b += max(0.0, (1.0 - abs(b - 0.13)/0.17) * 0.025);
+
+	// Artificial light is yellow-ish
+	// See C++ implementation in mapblock_mesh.cpp finalColorBlend()
+	rg += max(0.0, (1.0 - abs(rg - 0.85)/0.15) * 0.065);
+
+	color.r = rg;
+	color.g = rg;
+	color.b = b;
+
+	color.a = gl_Color.a;
+	gl_FrontColor = gl_BackColor = clamp(color,0.0,1.0);
 }

client/shaders/water_surface_shader/opengl_vertex.glsl

@@ -97,5 +97,31 @@ void main(void)
 	eyeVec = (gl_ModelViewMatrix * gl_Vertex).xyz;
 	tsEyeVec = eyeVec * tbnMatrix;
 
-	gl_FrontColor = gl_BackColor = gl_Color;
+	vec4 color;
+	float day = gl_Color.r;
+	float night = gl_Color.g;
+	float light_source = gl_Color.b;
+
+	float rg = mix(night, day, dayNightRatio);
+	rg += light_source * 2.5; // Make light sources brighter
+	float b = rg;
+
+	// Moonlight is blue
+	b += (day - night) / 13.0;
+	rg -= (day - night) / 23.0;
+
+	// Emphase blue a bit in darker places
+	// See C++ implementation in mapblock_mesh.cpp finalColorBlend()
+	b += max(0.0, (1.0 - abs(b - 0.13)/0.17) * 0.025);
+
+	// Artificial light is yellow-ish
+	// See C++ implementation in mapblock_mesh.cpp finalColorBlend()
+	rg += max(0.0, (1.0 - abs(rg - 0.85)/0.15) * 0.065);
+
+	color.r = rg;
+	color.g = rg;
+	color.b = b;
+
+	color.a = gl_Color.a;
+	gl_FrontColor = gl_BackColor = clamp(color,0.0,1.0);
 }

src/mapblock_mesh.cpp

@@ -1162,13 +1162,17 @@ MapBlockMesh::MapBlockMesh(MeshMakeData *data, v3s16 camera_offset):
 					applyFacesShading (vc, 0.836660);
 				}
 			}
-			// - Classic lighting
+			if(!m_enable_shaders)
+			{
+				// - Classic lighting (shaders handle this by themselves)
 				// Set initial real color and store for later updates
 				u8 day = vc.getRed();
 				u8 night = vc.getGreen();
 				finalColorBlend(vc, day, night, 1000);
+				if(day != night)
 					m_daynight_diffs[i][j] = std::make_pair(day, night);
 			}
+		}
 
 		// Create material
 		video::SMaterial material;
@@ -1331,7 +1335,7 @@ bool MapBlockMesh::animate(bool faraway, float time, int crack, u32 daynight_rat
 	}
 
 	// Day-night transition
-	if(daynight_ratio != m_last_daynight_ratio)
+	if(!m_enable_shaders && (daynight_ratio != m_last_daynight_ratio))
 	{
 		for(std::map<u32, std::map<u32, std::pair<u8, u8> > >::iterator
 				i = m_daynight_diffs.begin();