Let lighting be done only CPU side. Remove finalColorBlend implementation from shaders.

client/shaders/nodes_shader/opengl_vertex.glsl

@@ -97,31 +97,5 @@ void main(void)
 	eyeVec = (gl_ModelViewMatrix * gl_Vertex).xyz;
 	tsEyeVec = eyeVec * tbnMatrix;
 
-	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);
+	gl_FrontColor = gl_BackColor = gl_Color;
 }

client/shaders/water_surface_shader/opengl_vertex.glsl

@@ -97,31 +97,5 @@ void main(void)
 	eyeVec = (gl_ModelViewMatrix * gl_Vertex).xyz;
 	tsEyeVec = eyeVec * tbnMatrix;
 
-	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) / 13.0;
-
-	// 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);
+	gl_FrontColor = gl_BackColor = gl_Color;
 }

src/mapblock_mesh.cpp

@@ -1158,16 +1158,13 @@ MapBlockMesh::MapBlockMesh(MeshMakeData *data, v3s16 camera_offset):
 					applyFacesShading (vc, 0.836660);
 				}
 			}
-			if(!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);
-			}
+			// - Classic lighting
+			// 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