2 files changed, 35 insertions, 41 deletions

diff --git a/client/shaders/nodes_shader/opengl_fragment.glsl b/client/shaders/nodes_shader/opengl_fragment.glsl
index 71ded2b9d..7c5b9b613 100644
--- a/client/shaders/nodes_shader/opengl_fragment.glsl
+++ b/client/shaders/nodes_shader/opengl_fragment.glsl
@@ -37,7 +37,7 @@ const float fogShadingParameter = 1 / ( 1 - fogStart);
 
 vec3 uncharted2Tonemap(vec3 x)
 {
-	return ((x * (0.22 * x + 0.03) + 0.002) / (x * (0.22 * x + 0.3) + 0.06)) - 0.03334;
+	return ((x * (0.22 * x + 0.03) + 0.002) / (x * (0.22 * x + 0.3) + 0.06)) - 0.03333;
 }
 
 vec4 applyToneMapping(vec4 color)
@@ -163,7 +163,8 @@ void main(void)
 	}
 #endif
 
-	if (GENERATE_NORMALMAPS == 1 && normalTexturePresent == false) {
+#if GENERATE_NORMALMAPS == 1
+	if (normalTexturePresent == false) {
 		float tl = get_rgb_height(vec2(uv.x - SAMPLE_STEP, uv.y + SAMPLE_STEP));
 		float t  = get_rgb_height(vec2(uv.x - SAMPLE_STEP, uv.y - SAMPLE_STEP));
 		float tr = get_rgb_height(vec2(uv.x + SAMPLE_STEP, uv.y + SAMPLE_STEP));
@@ -177,7 +178,7 @@ void main(void)
 		bump = vec4(normalize(vec3 (dX, dY, NORMALMAPS_STRENGTH)), 1.0);
 		use_normalmap = true;
 	}
-
+#endif
 	vec4 base = texture2D(baseTexture, uv).rgba;
 
 #ifdef ENABLE_BUMPMAPPING
@@ -200,20 +201,18 @@ void main(void)
 	col = applyToneMapping(col);
 #endif
 
-	if (fogDistance != 0.0) {
-		// Due to a bug in some (older ?) graphics stacks (possibly in the glsl compiler ?),
-		// the fog will only be rendered correctly if the last operation before the
-		// clamp() is an addition. Else, the clamp() seems to be ignored.
-		// E.g. the following won't work:
-		//      float clarity = clamp(fogShadingParameter
-		//		* (fogDistance - length(eyeVec)) / fogDistance), 0.0, 1.0);
-		// As additions usually come for free following a multiplication, the new formula
-		// should be more efficient as well.
-		// Note: clarity = (1 - fogginess)
-		float clarity = clamp(fogShadingParameter
-			- fogShadingParameter * length(eyeVec) / fogDistance, 0.0, 1.0);
-		col = mix(skyBgColor, col, clarity);
-	}
+	// Due to a bug in some (older ?) graphics stacks (possibly in the glsl compiler ?),
+	// the fog will only be rendered correctly if the last operation before the
+	// clamp() is an addition. Else, the clamp() seems to be ignored.
+	// E.g. the following won't work:
+	//      float clarity = clamp(fogShadingParameter
+	//		* (fogDistance - length(eyeVec)) / fogDistance), 0.0, 1.0);
+	// As additions usually come for free following a multiplication, the new formula
+	// should be more efficient as well.
+	// Note: clarity = (1 - fogginess)
+	float clarity = clamp(fogShadingParameter
+		- fogShadingParameter * length(eyeVec) / fogDistance, 0.0, 1.0);
+	col = mix(skyBgColor, col, clarity);
 	col = vec4(col.rgb, base.a);
 
 	gl_FragColor = col;
diff --git a/client/shaders/nodes_shader/opengl_vertex.glsl b/client/shaders/nodes_shader/opengl_vertex.glsl
index 44c48cc4c..3ac79c26d 100644
--- a/client/shaders/nodes_shader/opengl_vertex.glsl
+++ b/client/shaders/nodes_shader/opengl_vertex.glsl
@@ -1,7 +1,8 @@
 uniform mat4 mWorldViewProj;
 uniform mat4 mWorld;
 
-uniform float dayNightRatio;
+// Color of the light emitted by the sun.
+uniform vec3 dayLight;
 uniform vec3 eyePosition;
 uniform float animationTimer;
 
@@ -14,6 +15,8 @@ varying vec3 tsEyeVec;
 varying vec3 tsLightVec;
 varying float area_enable_parallax;
 
+// Color of the light emitted by the light sources.
+const vec3 artificialLight = vec3(1.04, 1.04, 1.04);
 const float e = 2.718281828459;
 const float BS = 10.0;
 
@@ -119,31 +122,23 @@ float disp_z;
 	v.z = dot(eyeVec, normal);
 	tsEyeVec = normalize (v);
 
+	// Calculate color.
+	// Red, green and blue components are pre-multiplied with
+	// the brightness, so now we have to multiply these
+	// colors with the color of the incoming light.
+	// The pre-baked colors are halved to prevent overflow.
 	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;
-
+	// The alpha gives the ratio of sunlight in the incoming light.
+	float nightRatio = 1 - gl_Color.a;
+	color.rgb = gl_Color.rgb * (gl_Color.a * dayLight.rgb + 
+		nightRatio * artificialLight.rgb) * 2;
+	color.a = 1;
+	
 	// 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;
+	float brightness = (color.r + color.g + color.b) / 3;
+	color.b += max(0.0, 0.021 - abs(0.2 * brightness - 0.021) +
+		0.07 * brightness);
+	
 	gl_FrontColor = gl_BackColor = clamp(color, 0.0, 1.0);
 }