Added gamma setting, not hooked up yet

assets/voxygen/shaders/postprocess-frag.glsl

@@ -45,7 +45,9 @@ void main() {
 	//hsva_color.z = 1.0 - 1.0 / (1.0 * hsva_color.z + 1.0);
 	//vec4 final_color = vec4(hsv2rgb(hsva_color.rgb), hsva_color.a);
 
-	vec4 final_color = aa_color;    
+    vec4 gamma = vec4(1.0);
+	
+	vec4 final_color = pow(aa_color, gamma);
 
 	if (medium.x == 1u) {
 		final_color *= vec4(0.2, 0.2, 0.8, 1.0);

voxygen/src/hud/mod.rs

@@ -201,6 +201,7 @@ pub enum Event {
     ChangeAudioDevice(String),
     ChangeMaxFPS(u32),
     ChangeFOV(u16),
+    ChangeGamma(f32),
     AdjustWindowSize([u16; 2]),
     ToggleFullscreen,
     ChangeAaMode(AaMode),
@@ -1762,6 +1763,9 @@ impl Hud {
                     settings_window::Event::AdjustFOV(new_fov) => {
                         events.push(Event::ChangeFOV(new_fov));
                     },
+                    settings_window::Event::AdjustGamma(new_gamma) => {
+                        events.push(Event::ChangeGamma(new_gamma));
+                    },
                     settings_window::Event::ChangeAaMode(new_aa_mode) => {
                         events.push(Event::ChangeAaMode(new_aa_mode));
                     },

voxygen/src/hud/settings_window.rs

@@ -89,6 +89,9 @@ widget_ids! {
         fov_slider,
         fov_text,
         fov_value,
+        gamma_slider,
+        gamma_text,
+        gamma_value,
         aa_mode_text,
         aa_mode_list,
         cloud_mode_text,
@@ -199,6 +202,7 @@ pub enum Event {
     ToggleMouseYInvert(bool),
     AdjustViewDistance(u32),
     AdjustFOV(u16),
+    AdjustGamma(f32),
     AdjustWindowSize([u16; 2]),
     ToggleFullscreen,
     ChangeAaMode(AaMode),
@@ -1554,9 +1558,41 @@ impl<'a> Widget for SettingsWindow<'a> {
                 .color(TEXT_COLOR)
                 .set(state.ids.fov_value, ui);
 
+            // Gamma
+            Text::new(&self.localized_strings.get("hud.settings.gamma"))
+                .down_from(state.ids.fov_slider, 10.0)
+                .font_size(self.fonts.cyri.scale(14))
+                .font_id(self.fonts.cyri.conrod_id)
+                .color(TEXT_COLOR)
+                .set(state.ids.gamma_text, ui);
+
+            if let Some(new_val) = ImageSlider::continuous(
+                self.global_state.settings.graphics.gamma,
+                0.5,
+                2.0,
+                self.imgs.slider_indicator,
+                self.imgs.slider,
+            )
+            .w_h(104.0, 22.0)
+            .down_from(state.ids.gamma_text, 8.0)
+            .track_breadth(12.0)
+            .slider_length(10.0)
+            .pad_track((5.0, 5.0))
+            .set(state.ids.gamma_slider, ui)
+            {
+                events.push(Event::AdjustGamma(new_val));
+            }
+
+            Text::new(&format!("{}", self.global_state.settings.graphics.gamma))
+                .right_from(state.ids.gamma_slider, 8.0)
+                .font_size(self.fonts.cyri.scale(14))
+                .font_id(self.fonts.cyri.conrod_id)
+                .color(TEXT_COLOR)
+                .set(state.ids.gamma_value, ui);
+
             // AaMode
             Text::new(&self.localized_strings.get("hud.settings.antialiasing_mode"))
-                .down_from(state.ids.fov_slider, 8.0)
+                .down_from(state.ids.gamma_slider, 8.0)
                 .font_size(self.fonts.cyri.scale(14))
                 .font_id(self.fonts.cyri.conrod_id)
                 .color(TEXT_COLOR)

voxygen/src/session.rs

@@ -551,6 +551,10 @@ impl PlayState for SessionState {
                         global_state.settings.save_to_file_warn();
                         self.scene.camera_mut().set_fov_deg(new_fov);
                     },
+                    HudEvent::ChangeGamma(new_gamma) => {
+                        global_state.settings.graphics.gamma = new_gamma;
+                        global_state.settings.save_to_file_warn();
+                    },
                     HudEvent::ChangeAaMode(new_aa_mode) => {
                         // Do this first so if it crashes the setting isn't saved :)
                         global_state

voxygen/src/settings.rs

@@ -191,6 +191,7 @@ pub struct GraphicsSettings {
     pub view_distance: u32,
     pub max_fps: u32,
     pub fov: u16,
+    pub gamma: f32,
     pub aa_mode: AaMode,
     pub cloud_mode: CloudMode,
     pub fluid_mode: FluidMode,
@@ -204,6 +205,7 @@ impl Default for GraphicsSettings {
             view_distance: 10,
             max_fps: 60,
             fov: 50,
+            gamma: 1.0,
             aa_mode: AaMode::Fxaa,
             cloud_mode: CloudMode::Regular,
             fluid_mode: FluidMode::Shiny,