returns the option for scanlines, cleans up config

src/camera.rs

@@ -7,7 +7,6 @@ const SHOW_BOUNDARIES: bool = false;
 
 pub fn get_screen_bounds(ecs: &World, _ctx: &mut Rltk) -> (i32, i32, i32, i32, i32, i32) {
     let player_pos = ecs.fetch::<Point>();
-    //let (x_chars, y_chars) = ctx.get_char_size();
     let (x_chars, y_chars, x_offset, y_offset) = (69, 41, 1, 10);
 
     let centre_x = (x_chars / 2) as i32;

src/config/mod.rs

@@ -4,6 +4,7 @@ pub mod glyphs;
 pub mod messages;
 pub mod char_create;
 
-pub const SHOW_MAPGEN: bool = false;
-pub const LOG_SPAWNING: bool = true;
-pub const LOG_TICKS: bool = false;
+// DEBUG/LOGGING
+pub const SHOW_MAPGEN: bool = false; // Shows the step-by-step map gen process.
+pub const LOG_SPAWNING: bool = true; // Logs spawning of entities.
+pub const LOG_TICKS: bool = false; // Logs hunger/energy ticks.

src/config/visuals.rs

@@ -1,8 +1,16 @@
-pub const NON_VISIBLE_MULTIPLIER: f32 = 0.3;
-pub const MAX_DARKENING: f32 = 0.45;
-pub const START_DARKEN_AT_N_TILES: f32 = 8.0;
+// POST-PROCESSING
+pub const WITH_SCANLINES: bool = false; // Adds scanlines to the screen.
+pub const WITH_SCREEN_BURN: bool = false; // Requires WITH_SCANLINES.
+pub const WITH_DARKEN_BY_DISTANCE: bool = true; // If further away tiles should get darkened, instead of a harsh transition to non-visible.
 
-pub const SHORT_PARTICLE_LIFETIME: f32 = 100.0;
+pub const WITH_SCANLINES_BRIGHTEN_AMOUNT: f32 = 0.1; // 0.0 = no brightening, 1.0 = full brightening.
+pub const NON_VISIBLE_MULTIPLIER: f32 = 0.3; // 0.0 = black, 1.0 = full colour.
+pub const NON_VISIBLE_MULTIPLIER_IF_SCANLINES: f32 = 0.8; // as above, but when using scanlines. should be higher.
+pub const MAX_DARKENING: f32 = 0.45; // 0.0 = black, 1.0 = full colour - only used if WITH_DARKEN_BY_DISTANCE is true.
+pub const MAX_DARKENING_IF_SCANLINES: f32 = 0.9; // as above, but when using scanlines. should be higher.
+pub const START_DARKEN_AT_N_TILES: f32 = 8.0; // start darkening at this distance (should always be less than entity::DEFAULT_VIEWSHED_STANDARD).
+
+pub const SHORT_PARTICLE_LIFETIME: f32 = 100.0; // in ms
 pub const DEFAULT_PARTICLE_LIFETIME: f32 = 200.0;
 pub const LONG_PARTICLE_LIFETIME: f32 = 300.0;
 

src/main.rs

@@ -617,14 +617,16 @@ fn main() -> rltk::BError {
     //rltk::link_resource!(CURSES14X16, "../resources/curses_14x16.png");
 
     use rltk::RltkBuilder;
-    let context = RltkBuilder::new()
+    let mut context = RltkBuilder::new()
         .with_title("rust-rl")
         .with_dimensions(DISPLAYWIDTH, DISPLAYHEIGHT)
         .with_font("curses14x16.png", 14, 16)
         .with_tile_dimensions(14, 16)
         .with_simple_console(DISPLAYWIDTH, DISPLAYHEIGHT, "curses14x16.png")
-        //.with_simple_console_no_bg(DISPLAYWIDTH, DISPLAYHEIGHT, "terminal8x8.jpg")
         .build()?;
+    if config::visuals::WITH_SCANLINES {
+        context.with_post_scanlines(config::visuals::WITH_SCREEN_BURN);
+    }
 
     let mut gs = State {
         ecs: World::new(),

src/map/mod.rs

@@ -22,7 +22,6 @@ pub struct Map {
     pub visible_tiles: Vec<bool>,
     pub lit_tiles: Vec<bool>,
     pub telepath_tiles: Vec<bool>,
-    // Combine these offsets into one Vec<(u8, u8, u8)>
     pub colour_offset: Vec<(f32, f32, f32)>,
     pub additional_fg_offset: rltk::RGB,
     pub id: i32,

src/map/themes.rs

@@ -4,8 +4,6 @@ use crate::config::visuals::*;
 use rltk::prelude::*;
 use std::ops::{ Add, Mul };
 
-const DARKEN_TILES_BY_DISTANCE: bool = true;
-
 pub fn get_tile_renderables_for_id(idx: usize, map: &Map, other_pos: Option<Point>) -> (rltk::FontCharType, RGB, RGB) {
     let (glyph, mut fg, mut bg) = match map.id {
         2 => get_forest_theme_renderables(idx, map),
@@ -21,18 +19,28 @@ pub fn get_tile_renderables_for_id(idx: usize, map: &Map, other_pos: Option<Poin
 
     fg = fg.add(map.additional_fg_offset);
     (fg, bg) = apply_colour_offset(fg, bg, map, idx);
+    if WITH_SCANLINES && WITH_SCANLINES_BRIGHTEN_AMOUNT > 0.0 {
+        (fg, bg) = brighten_by(fg, bg, WITH_SCANLINES_BRIGHTEN_AMOUNT);
+    }
     bg = apply_bloodstain_if_necessary(bg, map, idx);
     let (mut multiplier, mut nonvisible, mut darken) = (1.0, false, false);
     if !map.visible_tiles[idx] {
-        multiplier = NON_VISIBLE_MULTIPLIER;
+        multiplier = if WITH_SCANLINES { NON_VISIBLE_MULTIPLIER_IF_SCANLINES } else { NON_VISIBLE_MULTIPLIER };
         nonvisible = true;
     }
-    if other_pos.is_some() && DARKEN_TILES_BY_DISTANCE && !nonvisible {
+    if other_pos.is_some() && WITH_DARKEN_BY_DISTANCE && !nonvisible {
         let distance = darken_by_distance(
             Point::new((idx as i32) % map.width, (idx as i32) / map.width),
             other_pos.unwrap()
         );
-        multiplier = distance.clamp(NON_VISIBLE_MULTIPLIER, 1.0);
+        multiplier = distance.clamp(
+            if WITH_SCANLINES {
+                NON_VISIBLE_MULTIPLIER_IF_SCANLINES
+            } else {
+                NON_VISIBLE_MULTIPLIER
+            },
+            1.0
+        );
         darken = true;
     }
     if nonvisible || darken {
@@ -237,14 +245,6 @@ fn apply_colour_offset(mut fg: RGB, mut bg: RGB, map: &Map, idx: usize) -> (RGB,
     return (fg, bg);
 }
 
-fn darken_if_not_visible(mut fg: RGB, mut bg: RGB, map: &Map, idx: usize) -> (RGB, RGB) {
-    if !map.visible_tiles[idx] {
-        fg = fg.mul(NON_VISIBLE_MULTIPLIER);
-        bg = bg.mul(NON_VISIBLE_MULTIPLIER);
-    }
-    return (fg, bg);
-}
-
 fn apply_bloodstain_if_necessary(mut bg: RGB, map: &Map, idx: usize) -> RGB {
     if map.bloodstains.contains(&idx) {
         bg = bg.add(RGB::named(BLOODSTAIN_COLOUR));
@@ -266,5 +266,11 @@ fn darken_by_distance(pos: Point, other_pos: Point) -> f32 {
         (distance - START_DARKEN_AT_N_TILES) /
         ((crate::config::entity::DEFAULT_VIEWSHED_STANDARD as f32) - START_DARKEN_AT_N_TILES);
     let interp_factor = interp_factor.max(0.0).min(1.0); // Clamp [0-1]
-    return 1.0 - interp_factor * (1.0 - MAX_DARKENING);
+    return 1.0 - interp_factor * (1.0 - (if WITH_SCANLINES { MAX_DARKENING_IF_SCANLINES } else { MAX_DARKENING }));
+}
+
+fn brighten_by(mut fg: RGB, mut bg: RGB, amount: f32) -> (RGB, RGB) {
+    fg = fg.add(RGB::from_f32(amount, amount, amount));
+    bg = bg.add(RGB::from_f32(amount, amount, amount));
+    return (fg, bg);
 }