add 'enable-fog' setting

res/shaders/lib/fog.glsl

@@ -8,12 +8,16 @@ uniform float u_weatherFogDencity;
 uniform float u_weatherFogCurve;
 
 float calc_fog(float depth, float fogFactor, float fogCurve) {
+#ifdef ENABLE_FOG
     return min(
         1.0,
         max(pow(depth * u_fogFactor * fogFactor, u_fogCurve * fogCurve),
             min(pow(depth * u_weatherFogDencity, u_weatherFogCurve),
                 u_weatherFogOpacity))
     );
+#else
+    return 0.0;
+#endif
 }
 
 float calc_fog(float depth) {

src/graphics/render/WorldRenderer.cpp

@@ -135,6 +135,7 @@ WorldRenderer::WorldRenderer(
     debugLines = std::make_unique<DebugLinesRenderer>(level);
     cloudsRenderer = std::make_unique<CloudsRenderer>();
 
+    keepAlive(observe_setting(settings.graphics.enableFog, dirtySettings));
     keepAlive(observe_setting(settings.graphics.advancedRender, dirtySettings));
     keepAlive(observe_setting(settings.graphics.shadowsQuality, dirtySettings));
     keepAlive(observe_setting(settings.graphics.ssao, dirtySettings));
@@ -156,10 +157,12 @@ void WorldRenderer::refreshSettings() {
     gbufferPipeline = graphics.advancedRender.get();
 
     int shadowsQuality = graphics.shadowsQuality.get() * gbufferPipeline;
+    bool enableFog = graphics.enableFog.get(); 
     shadowMapping->setQuality(shadowsQuality);
 
     std::vector<std::string> defines;
     if (shadowsQuality != 0) defines.emplace_back("ENABLE_SHADOWS");
+    if (enableFog) defines.emplace_back("ENABLE_FOG");
     if (graphics.ssao.get()) defines.emplace_back("ENABLE_SSAO");
     if (gbufferPipeline) defines.emplace_back("ADVANCED_RENDER");
 

src/io/settings_io.cpp

@@ -69,6 +69,7 @@ SettingsHandler::SettingsHandler(EngineSettings& settings) {
     builder.add("padding", &settings.chunks.padding);
 
     builder.addSection("graphics");
+    builder.add("enable-fog", &settings.graphics.enableFog);
     builder.add("fog-curve", &settings.graphics.fogCurve);
     builder.add("backlight", &settings.graphics.backlight);
     builder.add("dense-render", &settings.graphics.denseRender);

src/settings.hpp

@@ -63,6 +63,8 @@ struct CameraSettings {
 };
 
 struct GraphicsSettings {
+    /// @brief Enable fog
+    FlagSetting enableFog {true};
     /// @brief Fog opacity is calculated as `pow(depth*k, fogCurve)` where k depends on chunksLoadDistance.
     /// 1.0 is linear, 2.0 is quadratic
     NumberSetting fogCurve {1.0f, 1.0f, 6.0f};