Handle day-night transition in shader and make light sources brighter when shaders are used

client/shaders/test_shader_1/opengl_vertex.glsl

@@ -2,6 +2,7 @@
 uniform mat4 mWorldViewProj;
 uniform mat4 mInvWorld;
 uniform mat4 mTransWorld;
+uniform float dayNightRatio;
 
 varying vec3 vPosition;
 
@@ -11,15 +12,43 @@ void main(void)
 
 	vPosition = (mWorldViewProj * gl_Vertex).xyz;
 
-	if(gl_Normal.y > 0.5)
+	vec4 color;
-		gl_FrontColor = gl_BackColor = gl_Color;
+	//color = vec4(1.0, 1.0, 1.0, 1.0);
-	else
-		gl_FrontColor = gl_BackColor = gl_Color * 0.7;
 
-	/*if(gl_Normal.y > 0.5)
+	float day = gl_Color.r;
-		gl_FrontColor = gl_BackColor = vec4(1.0, 1.0, 1.0, 1.0);
+	float night = gl_Color.g;
-	else
+	float light_source = gl_Color.b;
-		gl_FrontColor = gl_BackColor = vec4(1.0, 1.0, 1.0, 1.0) * 0.7;*/
+
+	/*color.r = mix(night, day, dayNightRatio);
+	color.g = color.r;
+	color.b = color.r;*/
+
+	float rg = mix(night, day, dayNightRatio);
+	rg += light_source * 1.0; // 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;
+
+	if(gl_Normal.y <= 0.5)
+		color *= 0.7;
+
+	color.a = gl_Color.a;
+
+	gl_FrontColor = gl_BackColor = color;
 
 	gl_TexCoord[0] = gl_MultiTexCoord0;
 }

client/shaders/test_shader_2/opengl_vertex.glsl

@@ -2,6 +2,7 @@
 uniform mat4 mWorldViewProj;
 uniform mat4 mInvWorld;
 uniform mat4 mTransWorld;
+uniform float dayNightRatio;
 
 varying vec3 vPosition;
 
@@ -13,8 +14,40 @@ void main(void)
 
 	vPosition = (mWorldViewProj * gl_Vertex).xyz;
 
-	gl_FrontColor = gl_BackColor = gl_Color;
+	vec4 color;
-	//gl_FrontColor = gl_BackColor = vec4(1.0, 1.0, 1.0, 1.0);
+	//color = vec4(1.0, 1.0, 1.0, 1.0);
+
+	float day = gl_Color.r;
+	float night = gl_Color.g;
+	float light_source = gl_Color.b;
+
+	/*color.r = mix(night, day, dayNightRatio);
+	color.g = color.r;
+	color.b = color.r;*/
+
+	float rg = mix(night, day, dayNightRatio);
+	rg += light_source * 1.0; // 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 = color;
 
 	gl_TexCoord[0] = gl_MultiTexCoord0;
 }

src/content_mapblock.cpp

@@ -171,7 +171,7 @@ void mapblock_mesh_generate_special(MeshMakeData *data,
 				continue;
 
 			u16 l = getInteriorLight(n, 0, data);
-			video::SColor c = MapBlock_LightColor(f.alpha, l);
+			video::SColor c = MapBlock_LightColor(f.alpha, l, decode_light(f.light_source));
 			
 			video::S3DVertex vertices[4] =
 			{
@@ -226,7 +226,7 @@ void mapblock_mesh_generate_special(MeshMakeData *data,
 			// Otherwise use the light of this node (the liquid)
 			else
 				l = getInteriorLight(n, 0, data);
-			video::SColor c = MapBlock_LightColor(f.alpha, l);
+			video::SColor c = MapBlock_LightColor(f.alpha, l, decode_light(f.light_source));
 			
 			// Neighbor liquid levels (key = relative position)
 			// Includes current node
@@ -544,7 +544,7 @@ void mapblock_mesh_generate_special(MeshMakeData *data,
 			AtlasPointer ap = tile.texture;
 
 			u16 l = getInteriorLight(n, 1, data);
-			video::SColor c = MapBlock_LightColor(255, l);
+			video::SColor c = MapBlock_LightColor(255, l, decode_light(f.light_source));
 
 			for(u32 j=0; j<6; j++)
 			{
@@ -604,7 +604,7 @@ void mapblock_mesh_generate_special(MeshMakeData *data,
 			AtlasPointer pa_leaves = tile_leaves.texture;
 
 			u16 l = getInteriorLight(n, 1, data);
-			video::SColor c = MapBlock_LightColor(255, l);
+			video::SColor c = MapBlock_LightColor(255, l, decode_light(f.light_source));
 
 			v3f pos = intToFloat(p, BS);
 			aabb3f box(-BS/2,-BS/2,-BS/2,BS/2,BS/2,BS/2);
@@ -638,7 +638,8 @@ void mapblock_mesh_generate_special(MeshMakeData *data,
 
 			AtlasPointer ap = tile.texture;
 
-			video::SColor c(255,255,255,255);
+			u16 l = getInteriorLight(n, 1, data);
+			video::SColor c = MapBlock_LightColor(255, l, decode_light(f.light_source));
 
 			// Wall at X+ of node
 			video::S3DVertex vertices[4] =
@@ -683,7 +684,7 @@ void mapblock_mesh_generate_special(MeshMakeData *data,
 			AtlasPointer ap = tile.texture;
 
 			u16 l = getInteriorLight(n, 0, data);
-			video::SColor c = MapBlock_LightColor(255, l);
+			video::SColor c = MapBlock_LightColor(255, l, decode_light(f.light_source));
 				
 			float d = (float)BS/16;
 			// Wall at X+ of node
@@ -730,7 +731,7 @@ void mapblock_mesh_generate_special(MeshMakeData *data,
 			AtlasPointer ap = tile.texture;
 			
 			u16 l = getInteriorLight(n, 1, data);
-			video::SColor c = MapBlock_LightColor(255, l);
+			video::SColor c = MapBlock_LightColor(255, l, decode_light(f.light_source));
 
 			for(u32 j=0; j<4; j++)
 			{
@@ -793,7 +794,7 @@ void mapblock_mesh_generate_special(MeshMakeData *data,
 					tile.texture.id) + "^[transformR90");
 					
 			u16 l = getInteriorLight(n, 1, data);
-			video::SColor c = MapBlock_LightColor(255, l);
+			video::SColor c = MapBlock_LightColor(255, l, decode_light(f.light_source));
 
 			const f32 post_rad=(f32)BS/8;
 			const f32 bar_rad=(f32)BS/16;
@@ -996,7 +997,7 @@ void mapblock_mesh_generate_special(MeshMakeData *data,
 			AtlasPointer ap = tile.texture;
 			
 			u16 l = getInteriorLight(n, 0, data);
-			video::SColor c = MapBlock_LightColor(255, l);
+			video::SColor c = MapBlock_LightColor(255, l, decode_light(f.light_source));
 
 			float d = (float)BS/64;
 			
@@ -1045,7 +1046,7 @@ void mapblock_mesh_generate_special(MeshMakeData *data,
 			}
 
 			u16 l = getInteriorLight(n, 0, data);
-			video::SColor c = MapBlock_LightColor(255, l);
+			video::SColor c = MapBlock_LightColor(255, l, decode_light(f.light_source));
 
 			v3f pos = intToFloat(p, BS);
 

src/game.cpp

@@ -841,13 +841,15 @@ class GameGlobalShaderConstantSetter : public IShaderConstantSetter
 	Sky *m_sky;
 	bool *m_force_fog_off;
 	f32 *m_fog_range;
+	Client *m_client;
 
 public:
 	GameGlobalShaderConstantSetter(Sky *sky, bool *force_fog_off,
-			f32 *fog_range):
+			f32 *fog_range, Client *client):
 		m_sky(sky),
 		m_force_fog_off(force_fog_off),
-		m_fog_range(fog_range)
+		m_fog_range(fog_range),
+		m_client(client)
 	{}
 	~GameGlobalShaderConstantSetter() {}
 
@@ -873,10 +875,12 @@ public:
 		if(*m_force_fog_off)
 			fog_distance = 10000*BS;
 		services->setPixelShaderConstant("fogDistance", &fog_distance, 1);
-	}
 
-private:
+		// Day-night ratio
-	IrrlichtDevice *m_device;
+		u32 daynight_ratio = m_client->getEnv().getDayNightRatio();
+		float daynight_ratio_f = (float)daynight_ratio / 1000.0;
+		services->setPixelShaderConstant("dayNightRatio", &daynight_ratio_f, 1);
+	}
 };
 
 void the_game(
@@ -1307,8 +1311,8 @@ void the_game(
 	/*
 		Shader constants
 	*/
-	shsrc->addGlobalConstantSetter(
+	shsrc->addGlobalConstantSetter(new GameGlobalShaderConstantSetter(
-			new GameGlobalShaderConstantSetter(sky, &force_fog_off, &fog_range));
+			sky, &force_fog_off, &fog_range, &client));
 
 	/*
 		Main loop

src/itemdef.cpp

@@ -30,6 +30,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include "tile.h"
 #endif
 #include "log.h"
+#include "main.h" // g_settings
+#include "settings.h"
 #include "util/serialize.h"
 #include "util/container.h"
 #include "util/thread.h"
@@ -356,7 +358,10 @@ public:
 
 			scene::IMesh *node_mesh = mapblock_mesh.getMesh();
 			assert(node_mesh);
-			setMeshColor(node_mesh, video::SColor(255, 255, 255, 255));
+			video::SColor c(255, 255, 255, 255);
+			if(g_settings->getS32("enable_shaders") != 0)
+				c = MapBlock_LightColor(255, 0xffff, decode_light(f.light_source));
+			setMeshColor(node_mesh, c);
 
 			/*
 				Scale and translate the mesh so it's a unit cube

src/mapblock_mesh.cpp

@@ -435,7 +435,7 @@ struct FastFace
 };
 
 static void makeFastFace(TileSpec tile, u16 li0, u16 li1, u16 li2, u16 li3,
-		v3f p, v3s16 dir, v3f scale, core::array<FastFace> &dest)
+		v3f p, v3s16 dir, v3f scale, u8 light_source, core::array<FastFace> &dest)
 {
 	FastFace face;
 	
@@ -477,16 +477,16 @@ static void makeFastFace(TileSpec tile, u16 li0, u16 li1, u16 li2, u16 li3,
 	float h = tile.texture.size.Y;
 
 	face.vertices[0] = video::S3DVertex(vertex_pos[0], normal,
-			MapBlock_LightColor(alpha, li0),
+			MapBlock_LightColor(alpha, li0, light_source),
 			core::vector2d<f32>(x0+w*abs_scale, y0+h));
 	face.vertices[1] = video::S3DVertex(vertex_pos[1], normal,
-			MapBlock_LightColor(alpha, li1),
+			MapBlock_LightColor(alpha, li1, light_source),
 			core::vector2d<f32>(x0, y0+h));
 	face.vertices[2] = video::S3DVertex(vertex_pos[2], normal,
-			MapBlock_LightColor(alpha, li2),
+			MapBlock_LightColor(alpha, li2, light_source),
 			core::vector2d<f32>(x0, y0));
 	face.vertices[3] = video::S3DVertex(vertex_pos[3], normal,
-			MapBlock_LightColor(alpha, li3),
+			MapBlock_LightColor(alpha, li3, light_source),
 			core::vector2d<f32>(x0+w*abs_scale, y0));
 
 	face.tile = tile;
@@ -658,7 +658,8 @@ static void getTileInfo(
 		v3s16 &p_corrected,
 		v3s16 &face_dir_corrected,
 		u16 *lights,
-		TileSpec &tile
+		TileSpec &tile,
+		u8 &light_source
 	)
 {
 	VoxelManipulator &vmanip = data->m_vmanip;
@@ -688,18 +689,20 @@ static void getTileInfo(
 		tile = tile0;
 		p_corrected = p;
 		face_dir_corrected = face_dir;
+		light_source = ndef->get(n0).light_source;
 	}
 	else
 	{
 		tile = tile1;
 		p_corrected = p + face_dir;
 		face_dir_corrected = -face_dir;
+		light_source = ndef->get(n1).light_source;
 	}
 	
 	// eg. water and glass
 	if(equivalent)
 		tile.material_flags |= MATERIAL_FLAG_BACKFACE_CULLING;
-	
+
 	if(data->m_smooth_lighting == false)
 	{
 		lights[0] = lights[1] = lights[2] = lights[3] =
@@ -743,9 +746,10 @@ static void updateFastFaceRow(
 	v3s16 face_dir_corrected;
 	u16 lights[4] = {0,0,0,0};
 	TileSpec tile;
+	u8 light_source = 0;
 	getTileInfo(data, p, face_dir, 
 			makes_face, p_corrected, face_dir_corrected,
-			lights, tile);
+			lights, tile, light_source);
 
 	for(u16 j=0; j<MAP_BLOCKSIZE; j++)
 	{
@@ -759,6 +763,7 @@ static void updateFastFaceRow(
 		v3s16 next_face_dir_corrected;
 		u16 next_lights[4] = {0,0,0,0};
 		TileSpec next_tile;
+		u8 next_light_source = 0;
 		
 		// If at last position, there is nothing to compare to and
 		// the face must be drawn anyway
@@ -769,7 +774,7 @@ static void updateFastFaceRow(
 			getTileInfo(data, p_next, face_dir,
 					next_makes_face, next_p_corrected,
 					next_face_dir_corrected, next_lights,
-					next_tile);
+					next_tile, next_light_source);
 			
 			if(next_makes_face == makes_face
 					&& next_p_corrected == p_corrected + translate_dir
@@ -778,7 +783,8 @@ static void updateFastFaceRow(
 					&& next_lights[1] == lights[1]
 					&& next_lights[2] == lights[2]
 					&& next_lights[3] == lights[3]
-					&& next_tile == tile)
+					&& next_tile == tile
+					&& next_light_source == light_source)
 			{
 				next_is_different = false;
 			}
@@ -854,7 +860,7 @@ static void updateFastFaceRow(
 				}
 				
 				makeFastFace(tile, lights[0], lights[1], lights[2], lights[3],
-						sp, face_dir_corrected, scale,
+						sp, face_dir_corrected, scale, light_source,
 						dest);
 				
 				g_profiler->avg("Meshgen: faces drawn by tiling", 0);
@@ -873,6 +879,7 @@ static void updateFastFaceRow(
 			lights[2] = next_lights[2];
 			lights[3] = next_lights[3];
 			tile = next_tile;
+			light_source = next_light_source;
 		}
 		
 		p = p_next;
@@ -1058,18 +1065,20 @@ MapBlockMesh::MapBlockMesh(MeshMakeData *data):
 			os<<"^[verticalframe:"<<(int)p.tile.animation_frame_count<<":0";
 			p.tile.texture = tsrc->getTexture(os.str());
 		}
-		// - Lighting
+		// - Classic lighting (shaders handle this by themselves)
-		for(u32 j = 0; j < p.vertices.size(); j++)
+		if(!enable_shaders)
 		{
-			video::SColor &vc = p.vertices[j].Color;
+			for(u32 j = 0; j < p.vertices.size(); j++)
-			u8 day = vc.getRed();
+			{
-			u8 night = vc.getGreen();
+				video::SColor &vc = p.vertices[j].Color;
-			finalColorBlend(vc, day, night, 1000);
+				u8 day = vc.getRed();
-			if(day != night)
+				u8 night = vc.getGreen();
-				m_daynight_diffs[i][j] = std::make_pair(day, night);
+				finalColorBlend(vc, day, night, 1000);
+				if(day != night)
+					m_daynight_diffs[i][j] = std::make_pair(day, night);
+			}
 		}
 
-
 		// Create material
 		video::SMaterial material;
 		material.setFlag(video::EMF_LIGHTING, false);

src/mapblock_mesh.h

@@ -160,9 +160,10 @@ struct MeshCollector
 //   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
-inline video::SColor MapBlock_LightColor(u8 alpha, u16 light)
+//   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), 0);
+	return video::SColor(alpha, (light & 0xff), (light >> 8), light_source);
 }
 
 // Compute light at node