commit d52638c282106ccbb74c46fc3bf18a4f86bf3853
Author: kjuulh <contact@kjuulh.io>
Date:   Tue Jan 25 13:51:01 2022 +0100

    Add chapter 2.1-end

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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+ "send_wrapper",
+ "tokio-timer",
+ "wasm-bindgen",
+ "web-sys",
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+ "bitflags",
+ "downcast-rs",
+ "libc",
+ "nix 0.20.0",
+ "scoped-tls",
+ "wayland-commons",
+ "wayland-scanner",
+ "wayland-sys",
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+
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+ "winapi-x86_64-pc-windows-gnu",
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+ "core-foundation 0.9.2",
+ "core-graphics 0.22.3",
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+ "dispatch",
+ "instant",
+ "lazy_static",
+ "libc",
+ "log",
+ "mio",
+ "mio-extras",
+ "ndk",
+ "ndk-glue",
+ "ndk-sys",
+ "objc",
+ "parking_lot",
+ "percent-encoding",
+ "raw-window-handle 0.3.4",
+ "smithay-client-toolkit",
+ "wasm-bindgen",
+ "wayland-client",
+ "web-sys",
+ "winapi 0.3.9",
+ "x11-dl",
+]
+
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+ "lazy_static",
+ "libc",
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+dependencies = [
+ "nom 7.1.0",
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+[[package]]
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+checksum = "3a23fe958c70412687039c86f578938b4a0bb50ec788e96bce4d6ab00ddd5803"
+dependencies = [
+ "dirs",
+]
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+[[package]]
+name = "xml-rs"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..406cfc4
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "roguelike"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rltk = {version = "0.8.0"}
+specs = "0.17.0"
+specs-derive = "0.4.1"
diff --git a/resources/backing.fs b/resources/backing.fs
new file mode 100644
index 0000000..fcbebd0
--- /dev/null
+++ b/resources/backing.fs
@@ -0,0 +1,12 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec2 TexCoords;
+
+uniform sampler2D screenTexture;
+
+void main()
+{
+    vec3 col = texture(screenTexture, TexCoords).rgb;
+    FragColor = vec4(col, 1.0);
+}
\ No newline at end of file
diff --git a/resources/backing.vs b/resources/backing.vs
new file mode 100644
index 0000000..f35dcae
--- /dev/null
+++ b/resources/backing.vs
@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec2 aPos;
+layout (location = 1) in vec2 aTexCoords;
+
+out vec2 TexCoords;
+
+void main()
+{
+    TexCoords = aTexCoords;
+    gl_Position = vec4(aPos.x, aPos.y, 0.0, 1.0);
+}
diff --git a/resources/console_no_bg.fs b/resources/console_no_bg.fs
new file mode 100644
index 0000000..0dae487
--- /dev/null
+++ b/resources/console_no_bg.fs
@@ -0,0 +1,17 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec3 ourColor;
+in vec2 TexCoord;
+in vec3 ourBackground;
+
+// texture sampler
+uniform sampler2D texture1;
+
+void main()
+{
+    vec4 original = texture(texture1, TexCoord);
+    if (original.r < 0.1f || original.g < 0.1f || original.b < 0.1f) discard;
+    vec4 fg = original * vec4(ourColor, 1.f);
+	FragColor = fg;
+}
diff --git a/resources/console_no_bg.vs b/resources/console_no_bg.vs
new file mode 100644
index 0000000..3185e65
--- /dev/null
+++ b/resources/console_no_bg.vs
@@ -0,0 +1,17 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aColor;
+layout (location = 2) in vec3 bColor;
+layout (location = 3) in vec2 aTexCoord;
+
+out vec3 ourColor;
+out vec3 ourBackground;
+out vec2 TexCoord;
+
+void main()
+{
+	gl_Position = vec4(aPos, 1.0);
+	ourColor = aColor;
+	ourBackground = bColor;
+	TexCoord = vec2(aTexCoord.x, aTexCoord.y);
+}
\ No newline at end of file
diff --git a/resources/console_with_bg.fs b/resources/console_with_bg.fs
new file mode 100644
index 0000000..ae9e4fd
--- /dev/null
+++ b/resources/console_with_bg.fs
@@ -0,0 +1,16 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec3 ourColor;
+in vec2 TexCoord;
+in vec3 ourBackground;
+
+// texture sampler
+uniform sampler2D texture1;
+
+void main()
+{
+    vec4 original = texture(texture1, TexCoord);
+    vec4 fg = original.r > 0.1f || original.g > 0.1f || original.b > 0.1f ? original * vec4(ourColor, 1.f) : vec4(ourBackground, 1.f);
+	FragColor = fg;
+}
diff --git a/resources/console_with_bg.vs b/resources/console_with_bg.vs
new file mode 100644
index 0000000..3185e65
--- /dev/null
+++ b/resources/console_with_bg.vs
@@ -0,0 +1,17 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aColor;
+layout (location = 2) in vec3 bColor;
+layout (location = 3) in vec2 aTexCoord;
+
+out vec3 ourColor;
+out vec3 ourBackground;
+out vec2 TexCoord;
+
+void main()
+{
+	gl_Position = vec4(aPos, 1.0);
+	ourColor = aColor;
+	ourBackground = bColor;
+	TexCoord = vec2(aTexCoord.x, aTexCoord.y);
+}
\ No newline at end of file
diff --git a/resources/example_tiles.jpg b/resources/example_tiles.jpg
new file mode 100644
index 0000000..ca8aecd
Binary files /dev/null and b/resources/example_tiles.jpg differ
diff --git a/resources/example_tiles.xcf b/resources/example_tiles.xcf
new file mode 100644
index 0000000..e663f66
Binary files /dev/null and b/resources/example_tiles.xcf differ
diff --git a/resources/mltest.xp b/resources/mltest.xp
new file mode 100644
index 0000000..640adc7
Binary files /dev/null and b/resources/mltest.xp differ
diff --git a/resources/nyan.xp b/resources/nyan.xp
new file mode 100644
index 0000000..f27c58d
Binary files /dev/null and b/resources/nyan.xp differ
diff --git a/resources/scanlines.fs b/resources/scanlines.fs
new file mode 100644
index 0000000..fe509f4
--- /dev/null
+++ b/resources/scanlines.fs
@@ -0,0 +1,26 @@
+#version 330 core
+out vec4 FragColor;
+
+in vec2 TexCoords;
+
+uniform sampler2D screenTexture;
+uniform vec3 screenSize;
+uniform bool screenBurn;
+
+void main()
+{
+    vec3 col = texture(screenTexture, TexCoords).rgb;
+    float scanLine = mod(gl_FragCoord.y, 2.0) * 0.25;
+    vec3 scanColor = col.rgb - scanLine;
+
+    if (col.r < 0.1f && col.g < 0.1f && col.b < 0.1f) {
+        if (screenBurn) {
+            float dist = (1.0 - distance(vec2(gl_FragCoord.x / screenSize.x, gl_FragCoord.y / screenSize.y), vec2(0.5,0.5))) * 0.2;
+            FragColor = vec4(0.0, dist, dist, 1.0);
+        } else {
+            FragColor = vec4(0.0, 0.0, 0.0, 1.0);
+        }
+    } else {
+        FragColor = vec4(scanColor, 1.0);
+    }
+}
\ No newline at end of file
diff --git a/resources/scanlines.vs b/resources/scanlines.vs
new file mode 100644
index 0000000..f35dcae
--- /dev/null
+++ b/resources/scanlines.vs
@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec2 aPos;
+layout (location = 1) in vec2 aTexCoords;
+
+out vec2 TexCoords;
+
+void main()
+{
+    TexCoords = aTexCoords;
+    gl_Position = vec4(aPos.x, aPos.y, 0.0, 1.0);
+}
diff --git a/resources/terminal8x8.jpg b/resources/terminal8x8.jpg
new file mode 100644
index 0000000..13e393d
Binary files /dev/null and b/resources/terminal8x8.jpg differ
diff --git a/resources/vga8x16.jpg b/resources/vga8x16.jpg
new file mode 100644
index 0000000..291a37c
Binary files /dev/null and b/resources/vga8x16.jpg differ
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..4c4129c
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,97 @@
+use rltk::{GameState, Rltk, RGB};
+
+use specs::prelude::*;
+use specs_derive::Component;
+use std::cmp::{max, min};
+
+#[derive(Component)]
+struct Position {
+    x: i32,
+    y: i32,
+}
+
+#[derive(Component)]
+struct Renderable {
+    glyph: rltk::FontCharType,
+    fg: RGB,
+    bg: RGB,
+}
+
+#[derive(Component, Debug)]
+struct Player {}
+
+struct State {
+    ecs: World,
+}
+
+impl State {
+    fn run_systems(&mut self) {
+        let mut lw = LeftWalker {};
+        lw.run_now(&self.ecs);
+        self.ecs.maintain();
+    }
+}
+
+fn try_move_player(delta_x: i32, delta_y: i32, ecs: &mut World) {
+    let mut positions = ecs.write_storage::<Position>();
+    let mut players = ecs.write_storage::<Player>();
+
+    for (_player, pos) in (&mut players, &mut positions).join() {
+        pos.x = min(79, max(0, pos.x + delta_x));
+        pos.y = min(49, max(0, pos.y + delta_y));
+    }
+}
+
+fn player_input(gs: &mut State, ctx: &mut Rltk) {
+    match ctx.key {
+        None => {}
+        Some(key) => match key {
+            rltk::VirtualKeyCode::Left => try_move_player(-1, 0, &mut gs.ecs),
+            rltk::VirtualKeyCode::Right => try_move_player(1, 0, &mut gs.ecs),
+            rltk::VirtualKeyCode::Up => try_move_player(0, -1, &mut gs.ecs),
+            rltk::VirtualKeyCode::Down => try_move_player(0, 1, &mut gs.ecs),
+            _ => {}
+        },
+    }
+}
+
+impl GameState for State {
+    fn tick(&mut self, ctx: &mut rltk::Rltk) {
+        ctx.cls();
+
+        player_input(self, ctx);
+        self.run_systems();
+
+        let positions = self.ecs.read_storage::<Position>();
+        let renderables = self.ecs.read_storage::<Renderable>();
+
+        for (pos, render) in (&positions, &renderables).join() {
+            ctx.set(pos.x, pos.y, render.fg, render.bg, render.glyph)
+        }
+    }
+}
+
+fn main() -> rltk::BError {
+    use rltk::RltkBuilder;
+    let context = RltkBuilder::simple80x50()
+        .with_title("Roguelike Tutorial")
+        .build()?;
+    let mut gs = State { ecs: World::new() };
+
+    gs.ecs.register::<Position>();
+    gs.ecs.register::<Renderable>();
+    gs.ecs.register::<Player>();
+
+    gs.ecs
+        .create_entity()
+        .with(Position { x: 40, y: 25 })
+        .with(Renderable {
+            glyph: rltk::to_cp437('@'),
+            fg: RGB::named(rltk::YELLOW),
+            bg: RGB::named(rltk::BLACK),
+        })
+        .with(Player {})
+        .build();
+
+    rltk::main_loop(context, gs)
+}