Optimization for moon lighting

src/render/opengl/OpenGLRenderer.cpp

@@ -21,7 +21,7 @@ OpenGLRenderer::OpenGLRenderer(Scenery* scenery):
     shared_state = new OpenGLSharedState();
 
     shared_state->set("viewDistance", 300.0);
-    shared_state->set("exposure", 1.6);
+    shared_state->set("exposure", 1.2);
 
     skybox = new OpenGLSkybox(this);
     water = new OpenGLWater(this);

src/render/opengl/shaders/skybox.frag

@@ -15,5 +15,7 @@ void main(void)
     vec3 attenuation;
     vec3 inscattering = _getInscatterColor(x, t, v, s, r, mu, attenuation);
 
-    gl_FragColor = applyToneMapping(sunTransmittance + vec4(inscattering, 0.0));
+    gl_FragColor = vec4(0.01, 0.012, 0.03, 1.0); // night sky
+    gl_FragColor += sunTransmittance + vec4(inscattering, 0.0);
+    gl_FragColor = applyToneMapping(gl_FragColor);
 }

src/render/opengl/shaders/tonemapping.frag

@@ -12,21 +12,23 @@ float _uncharted2Tonemap(float x)
     return ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F;
 }
 
-vec4 applyToneMapping(vec4 color)
-{
-    return vec4(((color * exposure) / (1.0 + color * exposure)).rgb, 1.0);
-}
-
 /*vec4 applyToneMapping(vec4 color)
 {
+    float e = mix(exposure, exposure * 3.0, clamp(-sunDirection.y * 10.0, 0.0, 1.0));
+    return vec4(((color * e) / (1.0 + color * e)).rgb, 1.0);
+}*/
+
+vec4 applyToneMapping(vec4 color)
+{
+    float e = mix(exposure, exposure * 3.0, clamp(-sunDirection.y * 10.0, 0.0, 1.0));
     float W = 11.2;
     float white_scale = 1.0 / _uncharted2Tonemap(W);
     vec4 result;
 
-    result.r = pow(_uncharted2Tonemap(color.r * exposure) * white_scale, 1.0 / 2.2);
+    result.r = pow(_uncharted2Tonemap(color.r * e) * white_scale, 1.0 / 2.2);
-    result.g = pow(_uncharted2Tonemap(color.g * exposure) * white_scale, 1.0 / 2.2);
+    result.g = pow(_uncharted2Tonemap(color.g * e) * white_scale, 1.0 / 2.2);
-    result.b = pow(_uncharted2Tonemap(color.b * exposure) * white_scale, 1.0 / 2.2);
+    result.b = pow(_uncharted2Tonemap(color.b * e) * white_scale, 1.0 / 2.2);
     result.a = 1.0;
 
     return result;
-}*/
+}

src/render/software/LightStatus.cpp

@@ -6,6 +6,7 @@
 
 LightStatus::LightStatus(LightingManager *manager, const Vector3 &location, const Vector3 &eye)
 {
+    this->max_power = 0.0;
     this->manager = manager;
     this->location = location;
     this->eye = eye;
@@ -13,8 +14,19 @@ LightStatus::LightStatus(LightingManager *manager, const Vector3 &location, cons
 
 void LightStatus::pushComponent(LightComponent component)
 {
+    double power = component.color.getPower();
+    if (component.altered && (power < max_power * 0.05 || power < 0.001))
+    {
+        // Exclude filtered lights that are owerpowered by a previous one
+        return;
+    }
+
     if (manager->alterLight(component, location))
     {
+        if (power > max_power)
+        {
+            max_power = power;
+        }
         components.push_back(component);
     }
 }

src/render/software/LightStatus.h

@@ -25,6 +25,7 @@ public:
     Color apply(const Vector3 &normal, const SurfaceMaterial &material);
 
 private:
+    double max_power;
     LightingManager* manager;
     Vector3 location;
     Vector3 eye;

src/render/software/NightSky.cpp

@@ -72,7 +72,7 @@ const Color NightSky::getColor(double altitude, const Vector3 &direction)
             double dist = hit2.sub(hit1).getNorm() / moon_radius; // distance between intersection points (relative to radius)
 
             Vector3 nearest = (hit1.sub(location).getNorm() > hit2.sub(location).getNorm()) ? hit2 : hit1;
-            SurfaceMaterial moon_material(Color(3.0, 3.0, 3.0, 1.0));
+            SurfaceMaterial moon_material(Color(3.0, 3.0, 3.0));
             moon_material.validate();
 
             Color moon_color = renderer->applyLightingToSurface(nearest, nearest.sub(moon_position).normalize(), moon_material);
@@ -91,7 +91,7 @@ const Color NightSky::getColor(double altitude, const Vector3 &direction)
 
 void NightSky::fillLightingStatus(LightStatus *status, const Vector3 &, int)
 {
-    LightComponent moon;
+    LightComponent moon, sky;
 
     AtmosphereDefinition* atmosphere = renderer->getScenery()->getAtmosphere();
     VectorSpherical moon_location_s = {MOON_DISTANCE_SCALED, atmosphere->moon_theta, -atmosphere->moon_phi};
@@ -102,4 +102,11 @@ void NightSky::fillLightingStatus(LightStatus *status, const Vector3 &, int)
     moon.altered = 1;
 
     status->pushComponent(moon);
+
+    sky.color = Color(0.01, 0.012, 0.03);
+    sky.direction = VECTOR_DOWN;
+    sky.reflection = 0.0;
+    sky.altered = 0;
+
+    status->pushComponent(sky);
 }