editor

editor/.gitignore

@@ -0,0 +1,2 @@
+/target
+.vscode

editor/Cargo.lock

@@ -0,0 +1,46 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "bitflags"
+version = "2.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "843867be96c8daad0d758b57df9392b6d8d271134fce549de6ce169ff98a92af"
+
+[[package]]
+name = "lazy_static"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+
+[[package]]
+name = "libc"
+version = "0.2.183"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b5b646652bf6661599e1da8901b3b9522896f01e736bad5f723fe7a3a27f899d"
+
+[[package]]
+name = "sdl3"
+version = "0.17.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dce0693cede7f7901e968e5539f87174d0fb5fac5d489a3e3be52b2b4a0b49c5"
+dependencies = [
+ "bitflags",
+ "lazy_static",
+ "libc",
+ "sdl3-sys",
+]
+
+[[package]]
+name = "sdl3-sys"
+version = "0.6.1+SDL-3.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d73fc820b0b6b9bd0557de7b799ec9da1ca4f35fcd1cb42f7ceb85e640d1477"
+
+[[package]]
+name = "skate-slope"
+version = "0.1.0"
+dependencies = [
+ "sdl3",
+]

editor/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "skate-slope"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+sdl3 = "0.17.3"

editor/src/engine/error.rs

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+pub type Error = String;

editor/src/engine/game.rs

@@ -0,0 +1,53 @@
+use crate::engine::{
+    math::{V2, V3},
+    Triangle2,
+};
+use std::{marker::PhantomData, time::Duration};
+
+use super::error::Error;
+
+pub trait Io<R: Renderer, G: Game<R>> {
+    fn run(&mut self, game: &mut G);
+}
+
+pub trait Renderer {
+    fn draw_rect(&mut self, pos: V2, size: V2, color: Color);
+    fn draw_point(&mut self, pos: V2, color: Color);
+    fn draw_line(&mut self, from: V2, to: V2, color: Color);
+    fn draw_triangle(&mut self, triangle: Triangle2, color: Color);
+    fn draw_triangles(&mut self, triangles: &[Triangle2], color: Color);
+}
+
+#[derive(Clone, Copy)]
+pub enum Color {
+    Hex(u32),
+    White,
+    Green,
+    Red,
+    Cyan,
+    Black,
+}
+
+#[derive(PartialEq, Eq, Hash)]
+pub enum Key {
+    R,
+    Left,
+    Right,
+    Down,
+    Up,
+    W,
+    A,
+    S,
+    D,
+}
+
+pub enum Event {
+    KeyUp { key: Key },
+    KeyDown { key: Key },
+}
+
+pub trait Game<R: Renderer> {
+    fn update(&mut self, delta_time: Duration);
+    fn render(&mut self, r: &mut R);
+    fn event(&mut self, event: Event);
+}

editor/src/engine/math.rs

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+use std::ops::{Add, AddAssign, Mul, MulAssign, Sub, SubAssign};
+
+#[derive(Clone, Copy, PartialEq, Debug)]
+pub struct V2(pub f64, pub f64);
+
+#[derive(Clone, Copy, PartialEq, Debug)]
+pub struct V3(pub f64, pub f64, pub f64);
+
+impl V3 {
+    pub fn project_2d(&self) -> V2 {
+        // V2(self.0 / self.2, self.1 / self.2)
+        let c = V3(0.0, 0.0, -1.0);
+        let d = *self - c;
+        let e = V3(0.0, 0.0, 0.0) - c;
+        V2(e.2 / d.2 * d.0 + e.0, e.2 / d.2 * d.1 + e.1)
+    }
+
+    pub fn cross(&self, rhs: Self) -> Self {
+        let V3(ax, ay, az) = self;
+        let V3(bx, by, bz) = rhs;
+        Self(ay * bz - az * by, az * bx - ax * bz, ax * by - ay * bx)
+    }
+
+    pub fn dot(&self, rhs: Self) -> f64 {
+        let V3(ax, ay, az) = self;
+        let V3(bx, by, bz) = rhs;
+        ax * bx + ay * by + az * bz
+    }
+
+    pub fn len(&self) -> f64 {
+        f64::sqrt(self.0.powi(2) + self.1.powi(2) + self.2.powi(2))
+    }
+
+    pub fn unit(&self) -> Self {
+        self.map(|v| v / self.len())
+    }
+
+    pub fn map<F: Fn(f64) -> f64>(&self, func: F) -> Self {
+        V3(func(self.0), func(self.1), func(self.2))
+    }
+
+    pub fn rotate(&self, rot: Self) -> Self {
+        M3x3::new_rotate_z(rot.2)
+            * (M3x3::new_rotate_y(rot.1) * (M3x3::new_rotate_x(rot.0) * *self))
+    }
+
+    pub fn distance(&self, rhs: Self) -> f64 {
+        (*self - rhs).len()
+    }
+}
+
+impl Add for V3 {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self(self.0 + rhs.0, self.1 + rhs.1, self.2 + rhs.2)
+    }
+}
+impl Sub for V3 {
+    type Output = Self;
+
+    fn sub(self, rhs: Self) -> Self::Output {
+        Self(self.0 - rhs.0, self.1 - rhs.1, self.2 - rhs.2)
+    }
+}
+
+impl Mul<f64> for V3 {
+    type Output = V3;
+
+    fn mul(self, rhs: f64) -> Self::Output {
+        Self(self.0 * rhs, self.1 * rhs, self.2 * rhs)
+    }
+}
+
+impl Mul<Self> for V3 {
+    type Output = Self;
+
+    fn mul(self, rhs: Self) -> Self::Output {
+        Self(self.0 * rhs.0, self.1 * rhs.1, self.2 * rhs.2)
+    }
+}
+
+impl Add<&Self> for V3 {
+    type Output = Self;
+
+    fn add(self, rhs: &Self) -> Self::Output {
+        Self(self.0 + rhs.0, self.1 + rhs.1, self.2 + rhs.2)
+    }
+}
+impl Sub<&Self> for V3 {
+    type Output = Self;
+
+    fn sub(self, rhs: &Self) -> Self::Output {
+        Self(self.0 - rhs.0, self.1 - rhs.1, self.2 - rhs.2)
+    }
+}
+
+impl AddAssign for V3 {
+    fn add_assign(&mut self, rhs: Self) {
+        *self = *self + rhs;
+    }
+}
+impl SubAssign for V3 {
+    fn sub_assign(&mut self, rhs: Self) {
+        *self = *self - rhs;
+    }
+}
+impl MulAssign<f64> for V3 {
+    fn mul_assign(&mut self, rhs: f64) {
+        *self = *self * rhs;
+    }
+}
+
+#[derive(Clone, PartialEq, Debug)]
+pub struct Triangle2(pub V2, pub V2, pub V2);
+
+#[derive(Clone, PartialEq, Debug)]
+pub struct Triangle3(pub V3, pub V3, pub V3);
+
+impl Triangle3 {
+    pub fn normal(&self) -> V3 {
+        (self.1 - self.0).cross(self.2 - self.1)
+    }
+
+    pub fn translate(&self, offset: V3) -> Self {
+        Self(self.0 + offset, self.1 + offset, self.2 + offset)
+    }
+
+    pub fn project_2d(&self) -> Triangle2 {
+        Triangle2(
+            self.0.project_2d(),
+            self.1.project_2d(),
+            self.2.project_2d(),
+        )
+    }
+
+    pub fn middle(&self) -> V3 {
+        (self.0 + self.1 + self.2).map(|v| v / 3.0)
+    }
+
+    pub fn points(&self) -> [V3; 3] {
+        [self.0, self.1, self.2]
+    }
+}
+
+struct M3x3([f64; 9]);
+
+impl M3x3 {
+    #[rustfmt::skip]
+    pub fn new_rotate_x(angle: f64) -> Self {
+        Self([
+            1.0,             0.0,              0.0,
+            0.0, f64::cos(angle), -f64::sin(angle),
+            0.0, f64::sin(angle),  f64::cos(angle),
+        ])
+    }
+
+    #[rustfmt::skip]
+    pub fn new_rotate_y(angle: f64) -> Self {
+        Self([
+             f64::cos(angle), 0.0, f64::sin(angle),
+                         0.0, 1.0,             0.0,
+            -f64::sin(angle), 0.0, f64::cos(angle),
+        ])
+    }
+
+    #[rustfmt::skip]
+    pub fn new_rotate_z(angle: f64) -> Self {
+        Self([
+            f64::cos(angle), -f64::sin(angle), 0.0,
+            f64::sin(angle),  f64::cos(angle), 0.0,
+                        0.0,              0.0, 1.0,
+        ])
+    }
+}
+
+impl Mul<V3> for M3x3 {
+    type Output = V3;
+
+    fn mul(self, rhs: V3) -> Self::Output {
+        let V3(x, y, z) = rhs;
+        let [xx, xy, xz, yx, yy, yz, zx, zy, zz] = self.0;
+        V3(
+            x * xx + y * xy + z * xz,
+            x * yx + y * yy + z * yz,
+            x * zx + y * zy + z * zz,
+        )
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn v3_ops() {
+        let v3 = |v: f64| V3(v, v, v);
+
+        assert_eq!(v3(1.0) + v3(2.0), v3(3.0));
+        assert_eq!(v3(3.0) - v3(2.0), v3(1.0));
+        assert_eq!(v3(2.0) * 2.0, v3(4.0));
+
+        let mut a = v3(1.0);
+        a += v3(2.0);
+        assert_eq!(a, v3(3.0));
+
+        let mut a = v3(2.0);
+        a *= 2.0;
+        assert_eq!(a, v3(4.0));
+    }
+}

editor/src/engine/mod.rs

@@ -0,0 +1,17 @@
+#![allow(unused_imports)]
+
+mod error;
+mod game;
+mod math;
+mod r3d;
+mod scene;
+mod sdl_io;
+mod shapes;
+
+pub use error::*;
+pub use game::*;
+pub use math::*;
+pub use r3d::*;
+pub use scene::*;
+pub use sdl_io::*;
+pub use shapes::*;

editor/src/engine/r3d.rs

@@ -0,0 +1,72 @@
+use crate::engine::{game::Renderer, Color, Shape, Triangle2, Triangle3, V2, V3};
+
+pub struct R3d<'r, R: Renderer> {
+    r: &'r mut R,
+    triangle_buffer: Vec<Triangle2>,
+}
+
+static CAMERA_POS: V3 = V3(0.0, 0.0, -1.0);
+
+impl<'r, R: Renderer> R3d<'r, R> {
+    pub fn new(r: &'r mut R) -> Self {
+        Self {
+            r,
+            triangle_buffer: Vec::new(),
+        }
+    }
+
+    pub fn draw_line(&mut self, from: V3, to: V3, color: Color) {
+        self.r.draw_line(from.project_2d(), to.project_2d(), color);
+    }
+
+    pub fn draw_triangle(&mut self, triangle: Triangle3, color: Color) {
+        let triangle = triangle.translate(CAMERA_POS).project_2d();
+
+        self.r.draw_line(triangle.0, triangle.1, color);
+        self.r.draw_line(triangle.1, triangle.2, color);
+        self.r.draw_line(triangle.2, triangle.0, color);
+    }
+
+    pub fn draw_shape(&mut self, pos: V3, shape: &Shape, outline_color: Color, fill_color: Color) {
+        self.triangle_buffer.clear();
+        self.triangle_buffer
+            .extend(shape.faces().map(|tri| tri.translate(pos).project_2d()));
+
+        self.r.draw_triangles(&self.triangle_buffer, fill_color);
+
+        for face in shape.faces() {
+            if face.normal().dot(face.0 - CAMERA_POS + pos) >= 0.0 {
+                continue;
+            }
+            // let pxyz = face.middle() + face.normal();
+            // self.draw_line(
+            //     face.middle() + pos,
+            //     face.middle() + (face.1 - face.0).unit() * 0.02 + pos,
+            //     Color::HEX(0xffaa00),
+            // );
+            // self.draw_line(
+            //     face.middle() + pos,
+            //     face.middle() + (face.2 - face.1).unit() * 0.02 + pos,
+            //     Color::HEX(0x00ffaa),
+            // );
+            // self.draw_line(
+            //     face.middle() + pos,
+            //     face.middle() + (face.0 - face.2).unit() * 0.02 + pos,
+            //     Color::HEX(0xaa00ff),
+            // );
+            // self.draw_line(face.middle() + pos, pxyz + pos, Color::HEX(0xffffff));
+
+            // self.draw_triangle(face.translate(pos - CAMERA_POS), outline_color);
+            self.r.draw_line(
+                (face.0 + pos).project_2d(),
+                (face.1 + pos).project_2d(),
+                outline_color,
+            );
+            self.r.draw_line(
+                (face.2 + pos).project_2d(),
+                (face.0 + pos).project_2d(),
+                outline_color,
+            );
+        }
+    }
+}

editor/src/engine/scene.rs

@@ -0,0 +1,68 @@
+use crate::engine::{Color, Renderer, Shape, Triangle3, V3};
+
+pub struct DrawnTriangle {
+    triangle: Triangle3,
+    outline_color: Color,
+    fill_color: Color,
+}
+
+pub struct Scene {
+    objects: Vec<DrawnTriangle>,
+}
+
+impl Scene {
+    pub fn new() -> Self {
+        Self {
+            objects: Vec::new(),
+        }
+    }
+
+    pub fn render<R: Renderer>(&mut self, r: &mut R, camera: V3) {
+        let mut indices_with_scores = self
+            .objects
+            .iter()
+            .enumerate()
+            .map(|(i, object)| {
+                let mut point_scores = object.triangle.points().map(|p| p.distance(camera));
+                point_scores.sort_by(|a, b| a.total_cmp(b));
+
+                (i, point_scores[0])
+            })
+            .rev()
+            .collect::<Vec<_>>();
+
+        indices_with_scores.sort_by(|a, b| b.1.total_cmp(&a.1));
+
+        for (i, _) in indices_with_scores {
+            let object = &self.objects[i];
+
+            // check if behind camera
+            if !(object.triangle.0 .2 >= -1.0
+                && object.triangle.1 .2 >= -1.0
+                && object.triangle.2 .2 >= -1.0)
+            {
+                continue;
+            }
+
+            if object.triangle.normal().dot(object.triangle.0 - camera) >= 0.0 {
+                continue;
+            }
+
+            let triangle = object.triangle.project_2d();
+
+            r.draw_triangle(triangle.clone(), object.fill_color);
+            r.draw_line(triangle.0, triangle.1, object.outline_color);
+            r.draw_line(triangle.0, triangle.2, object.outline_color);
+        }
+    }
+
+    pub fn draw_shape(&mut self, pos: V3, shape: &Shape, outline_color: Color, fill_color: Color) {
+        for triangle in shape.faces() {
+            self.objects.push(DrawnTriangle {
+                triangle: triangle.translate(pos),
+                outline_color,
+                fill_color,
+            })
+        }
+    }
+}

editor/src/engine/sdl_io.rs

@@ -0,0 +1,280 @@
+use std::time::{Duration, Instant};
+
+use sdl3::{
+    event::Event,
+    keyboard::Keycode,
+    pixels::{Color as SdlColor, FColor, PixelFormat},
+    rect::Point,
+    render::{Canvas, FPoint, FRect, Vertex, VertexIndices},
+    video::Window,
+    Sdl, VideoSubsystem,
+};
+
+use crate::engine::{
+    error::Error,
+    game,
+    math::{V2, V3},
+    Color, Renderer, Triangle2,
+};
+
+pub static WIDTH: f64 = 1280.0;
+pub static HEIGHT: f64 = 720.0;
+
+pub struct SdlIo {
+    sdl_context: Sdl,
+    video_subsystem: VideoSubsystem,
+    canvas: Canvas<Window>,
+}
+
+impl SdlIo {
+    pub fn new() -> Result<Self, Error> {
+        let sdl_context = sdl3::init().unwrap();
+        let video_subsystem = sdl_context.video().unwrap();
+        let window = video_subsystem
+            .window("Game", WIDTH as u32, HEIGHT as u32)
+            .position_centered()
+            .build()
+            .unwrap();
+        let mut canvas = window.into_canvas();
+
+        canvas.set_draw_color(SdlColor::BLACK);
+        canvas.clear();
+        canvas.present();
+
+        Ok(Self {
+            sdl_context,
+            video_subsystem,
+            canvas,
+        })
+    }
+
+    pub fn run(&mut self, game: &mut impl game::Game<Self>) {
+        let mut event_pump = self.sdl_context.event_pump().unwrap();
+
+        let mut time_before = Instant::now();
+        let time_per_frame = Duration::from_secs_f64(1.0 / 60.0);
+        let mut print_fps_timer = Instant::now();
+        let mut fps_count = 0;
+
+        'running: loop {
+            for event in event_pump.poll_iter() {
+                match event {
+                    Event::Quit { .. }
+                    | Event::KeyDown {
+                        keycode: Some(Keycode::Escape),
+                        ..
+                    } => break 'running,
+                    Event::KeyDown { keycode, .. } => match keycode {
+                        Some(key) => match key {
+                            Keycode::R => {
+                                game.event(game::Event::KeyDown { key: game::Key::R });
+                            }
+                            Keycode::W => {
+                                game.event(game::Event::KeyDown { key: game::Key::W });
+                            }
+                            Keycode::A => {
+                                game.event(game::Event::KeyDown { key: game::Key::A });
+                            }
+                            Keycode::S => {
+                                game.event(game::Event::KeyDown { key: game::Key::S });
+                            }
+                            Keycode::D => {
+                                game.event(game::Event::KeyDown { key: game::Key::D });
+                            }
+                            Keycode::Down => {
+                                game.event(game::Event::KeyDown {
+                                    key: game::Key::Down,
+                                });
+                            }
+                            Keycode::Up => {
+                                game.event(game::Event::KeyDown { key: game::Key::Up });
+                            }
+                            Keycode::Left => {
+                                game.event(game::Event::KeyDown {
+                                    key: game::Key::Left,
+                                });
+                            }
+                            Keycode::Right => {
+                                game.event(game::Event::KeyDown {
+                                    key: game::Key::Right,
+                                });
+                            }
+                            _ => {}
+                        },
+                        None => {}
+                    },
+                    Event::KeyUp { keycode, .. } => match keycode {
+                        Some(key) => match key {
+                            Keycode::R => {
+                                game.event(game::Event::KeyUp { key: game::Key::R });
+                            }
+                            Keycode::W => {
+                                game.event(game::Event::KeyUp { key: game::Key::W });
+                            }
+                            Keycode::A => {
+                                game.event(game::Event::KeyUp { key: game::Key::A });
+                            }
+                            Keycode::S => {
+                                game.event(game::Event::KeyUp { key: game::Key::S });
+                            }
+                            Keycode::D => {
+                                game.event(game::Event::KeyUp { key: game::Key::D });
+                            }
+                            Keycode::Down => {
+                                game.event(game::Event::KeyUp {
+                                    key: game::Key::Down,
+                                });
+                            }
+                            Keycode::Up => {
+                                game.event(game::Event::KeyUp { key: game::Key::Up });
+                            }
+                            Keycode::Left => {
+                                game.event(game::Event::KeyUp {
+                                    key: game::Key::Left,
+                                });
+                            }
+                            Keycode::Right => {
+                                game.event(game::Event::KeyUp {
+                                    key: game::Key::Right,
+                                });
+                            }
+                            _ => {}
+                        },
+                        None => {}
+                    },
+
+                    _ => {}
+                }
+            }
+
+            let time_now = Instant::now();
+            let delta_time = time_now - time_before;
+            time_before = time_now;
+            game.update(delta_time);
+
+            self.canvas.set_draw_color(SdlColor::BLACK);
+            self.canvas.clear();
+            game.render(self);
+            self.canvas.present();
+
+            fps_count += 1;
+            if (time_now - print_fps_timer).as_secs_f64() > 1.0 {
+                println!("fps: {fps_count}");
+                fps_count = 0;
+                print_fps_timer = time_now;
+            }
+            if delta_time < time_per_frame {
+                std::thread::sleep(time_per_frame - delta_time);
+            }
+        }
+    }
+
+    /// world space to screen space
+    fn scale_w2s(&self, v: V2) -> V2 {
+        let factor = WIDTH / 2.0;
+        V2(v.0 * factor, v.1 * factor)
+    }
+    /// world space to screen space.
+    fn translate_w2s(&self, v: V2) -> V2 {
+        let middle = V2(WIDTH / 2.0, HEIGHT / 2.0);
+        V2(v.0 + middle.0, middle.1 - v.1)
+    }
+
+    /// scale -> translate
+    fn point_w2s(&self, v: V2) -> V2 {
+        self.translate_w2s(self.scale_w2s(v))
+    }
+}
+
+impl Renderer for SdlIo {
+    fn draw_rect(&mut self, pos: V2, size: V2, color: Color) {
+        let pos = self.point_w2s(pos);
+        let size = self.scale_w2s(size);
+        self.canvas.set_draw_color(color);
+        self.canvas
+            .fill_rect(FRect::new(pos.0 as _, pos.1 as _, size.0 as _, size.1 as _))
+            .unwrap();
+    }
+
+    fn draw_point(&mut self, pos: V2, color: Color) {
+        let pos = self.point_w2s(pos);
+        let size = 4.0;
+        self.canvas.set_draw_color(color);
+        self.canvas
+            .fill_rect(FRect::new(
+                (pos.0 - size / 2.0) as _,
+                (pos.1 - size / 2.0) as _,
+                size as _,
+                size as _,
+            ))
+            .unwrap();
+    }
+
+    fn draw_line(&mut self, from: V2, to: V2, color: Color) {
+        self.canvas.set_draw_color(color);
+        self.canvas
+            .draw_line(self.point_w2s(from), self.point_w2s(to))
+            .unwrap();
+    }
+
+    fn draw_triangles(&mut self, triangles: &[Triangle2], color: Color) {
+        let vertices = triangles
+            .iter()
+            .flat_map(|t| [t.0, t.1, t.2])
+            .map(|p| self.point_w2s(p))
+            .map(|p| Vertex {
+                position: p.into(),
+                color: color.into(),
+                tex_coord: FPoint::new(0.0, 0.0),
+            })
+            .collect::<Vec<_>>();
+
+        self.canvas
+            .render_geometry(&vertices, None, VertexIndices::Sequential)
+            .unwrap();
+    }
+
+    fn draw_triangle(&mut self, triangle: Triangle2, color: Color) {
+        let vertices = [triangle.0, triangle.1, triangle.2]
+            .into_iter()
+            .map(|p| self.point_w2s(p))
+            .map(|p| Vertex {
+                position: p.into(),
+                color: color.into(),
+                tex_coord: FPoint::new(0.0, 0.0),
+            })
+            .collect::<Vec<_>>();
+        self.canvas
+            .render_geometry(&vertices, None, VertexIndices::Sequential)
+            .unwrap();
+    }
+}
+
+impl From<V2> for FPoint {
+    fn from(value: V2) -> Self {
+        FPoint::new(value.0 as _, value.1 as _)
+    }
+}
+
+impl From<Color> for SdlColor {
+    fn from(value: Color) -> Self {
+        match value {
+            Color::Hex(v) => SdlColor::RGB(
+                ((v >> 16) & 0xff) as u8,
+                ((v >> 8) & 0xff) as u8,
+                (v & 0xff) as u8,
+            ),
+            Color::White => SdlColor::WHITE,
+            Color::Green => SdlColor::GREEN,
+            Color::Red => SdlColor::RED,
+            Color::Cyan => SdlColor::CYAN,
+            Color::Black => SdlColor::BLACK,
+        }
+    }
+}
+
+impl From<Color> for FColor {
+    fn from(value: Color) -> Self {
+        FColor::from(<Color as Into<SdlColor>>::into(value))
+    }
+}

editor/src/engine/shapes.rs

@@ -0,0 +1,134 @@
+use crate::engine::{math::V3, Triangle3, V2};
+
+static CUBE_VERTICES: [(i8, i8, i8); 8] = [
+    (0, 1, 0), //  0 front top     left
+    (1, 1, 0), //  1 front top     right
+    (0, 0, 0), //  2 front bottom  left
+    (1, 0, 0), //  3 front bottom  right
+    (0, 1, 1), //  4 back  top     left
+    (1, 1, 1), //  5 back  top     right
+    (0, 0, 1), //  6 back  bottom  left
+    (1, 0, 1), //  7 back  bottom  right
+];
+
+static CUBE_EDGES: [(usize, usize); 12] = [
+    (0, 1), // ftl -> ftr
+    (2, 3), // fbl -> fbr
+    (4, 5), // btl -> btr
+    (6, 7), // bbl -> bbr
+    (0, 2), // ftl -> fbl
+    (1, 3), // ftr -> fbr
+    (4, 6), // btl -> bbl
+    (5, 7), // btr -> bbr
+    (0, 4), // ftl -> btl
+    (1, 5), // ftr -> btr
+    (2, 6), // fbl -> bbl
+    (3, 7), // fbr -> bbr
+];
+
+static CUBE_FACES: [(usize, usize, usize); 12] = [
+    // front
+    (0, 1, 2),
+    (3, 2, 1),
+    // top
+    (0, 4, 1),
+    (5, 1, 4),
+    // right
+    (7, 3, 5),
+    (1, 5, 3),
+    // back
+    (5, 4, 7),
+    (6, 7, 4),
+    // bottom
+    (3, 7, 2),
+    (6, 2, 7),
+    // left
+    (4, 0, 6),
+    (2, 6, 0),
+];
+
+static PLANE_VERTICES: [(i8, i8, i8); 4] = [
+    //
+    (0, 0, 0),
+    (0, 0, 1),
+    (1, 0, 0),
+    (1, 0, 1),
+];
+static PLANE_EDGES: [(usize, usize); 4] = [
+    //
+    (0, 1),
+    (2, 3),
+    (0, 2),
+    (1, 3),
+];
+static PLANE_FACES: [(usize, usize, usize); 2] = [
+    //
+    (0, 1, 2),
+    (3, 2, 1),
+];
+
+pub struct Shape {
+    vertices: Vec<V3>,
+    edges: Vec<(usize, usize)>,
+    faces: Vec<(usize, usize, usize)>,
+}
+
+impl Shape {
+    pub fn new_plane(dim: V3) -> Self {
+        Self {
+            vertices: PLANE_VERTICES
+                .iter()
+                .map(|p| scale_i8_vertex(*p, &dim))
+                .collect(),
+            edges: Vec::from_iter(PLANE_EDGES),
+            faces: Vec::from_iter(PLANE_FACES),
+        }
+    }
+
+    pub fn new_cube(dim: V3) -> Self {
+        Self {
+            vertices: CUBE_VERTICES
+                .iter()
+                .map(|p| scale_i8_vertex(*p, &dim))
+                .collect(),
+            edges: Vec::from_iter(CUBE_EDGES),
+            faces: Vec::from_iter(CUBE_FACES),
+        }
+    }
+
+    pub fn vertices<'a>(&'a self) -> impl Iterator<Item = V3> + 'a {
+        self.vertices.iter().cloned()
+    }
+
+    pub fn edges<'a>(&'a self) -> impl Iterator<Item = (V3, V3)> + 'a {
+        let verts: &[V3] = &self.vertices;
+        self.edges.iter().map(|(a, b)| (verts[*a], verts[*b]))
+    }
+
+    pub fn faces<'a>(&'a self) -> impl Iterator<Item = Triangle3> + 'a {
+        let verts: &[V3] = &self.vertices;
+        self.faces
+            .iter()
+            .map(|(a, b, c)| Triangle3(verts[*a], verts[*b], verts[*c]))
+    }
+
+    pub fn rotate(&self, rot: V3) -> Self {
+        Self {
+            vertices: self.vertices.iter().map(|v| v.rotate(rot)).collect(),
+            edges: self.edges.clone(),
+            faces: self.faces.clone(),
+        }
+    }
+
+    pub fn translate(&self, trans: V3) -> Self {
+        Self {
+            vertices: self.vertices.iter().map(|v| *v + trans).collect(),
+            edges: self.edges.clone(),
+            faces: self.faces.clone(),
+        }
+    }
+}
+
+fn scale_i8_vertex(p: (i8, i8, i8), s: &V3) -> V3 {
+    V3(p.0 as f64 * s.0, p.1 as f64 * s.1, p.2 as f64 * s.2)
+}

editor/src/main.rs

@@ -0,0 +1,361 @@
+#![allow(dead_code)]
+
+use std::{collections::HashSet, f64::consts::PI, time::Duration};
+
+use crate::engine::{Color, Key, Renderer, Scene, Shape, V3};
+
+mod engine;
+
+struct Game {
+    objects: Vec<Object>,
+    next_object_id: u32,
+    keys_pressed: HashSet<Key>,
+}
+
+impl Game {
+    fn new() -> Self {
+        Self {
+            objects: Vec::new(),
+            next_object_id: 0,
+            keys_pressed: HashSet::new(),
+        }
+    }
+
+    fn spawn(&mut self, object_kind: ObjectKind) {
+        let object = Object {
+            kind: object_kind,
+            id: self.next_object_id,
+        };
+        self.objects.push(object);
+        self.next_object_id += 1
+    }
+
+    fn despawn(&mut self, id: u32) {
+        let index = self
+            .objects
+            .iter()
+            .position(|o| o.id == id)
+            .expect("doesn't exist");
+        self.objects.remove(index);
+    }
+}
+
+impl<R: Renderer> engine::Game<R> for Game {
+    fn update(&mut self, delta_time: Duration) {
+        for object in &mut self.objects {
+            if self.keys_pressed.contains(&Key::A) {
+                match &mut object.kind {
+                    ObjectKind::SkateBoard { pivot_deg, .. } => {
+                        *pivot_deg -= 18.0 * delta_time.as_secs_f64();
+                        if *pivot_deg < -12.5 {
+                            *pivot_deg = -12.5;
+                        }
+                    }
+                }
+            }
+            if self.keys_pressed.contains(&Key::D) {
+                match &mut object.kind {
+                    ObjectKind::SkateBoard {
+                        pivot_deg: pivot_factor,
+                        ..
+                    } => {
+                        *pivot_factor += 18.0 * delta_time.as_secs_f64();
+                        if *pivot_factor > 12.5 {
+                            *pivot_factor = 12.5;
+                        }
+                    }
+                }
+            }
+            if !(self.keys_pressed.contains(&Key::A) || self.keys_pressed.contains(&Key::D)) {
+                match &mut object.kind {
+                    ObjectKind::SkateBoard {
+                        pivot_deg: pivot_factor,
+                        ..
+                    } => {
+                        let decay_rate = 1.0 - (2.0 * delta_time.as_secs_f64());
+                        *pivot_factor *= decay_rate;
+                    }
+                }
+            }
+            if self.keys_pressed.contains(&Key::R) {
+                match &mut object.kind {
+                    ObjectKind::SkateBoard { rot, pos, .. } => {
+                        *pos = V3(0.0, -0.1, -0.6);
+                        *rot = V3(0.0, 0.5 * PI, 0.0);
+                    }
+                }
+            }
+            if self.keys_pressed.contains(&Key::W) {
+                match &mut object.kind {
+                    ObjectKind::SkateBoard { rot, .. } => rot.0 += 1.0 * delta_time.as_secs_f64(),
+                }
+            }
+            if self.keys_pressed.contains(&Key::S) {
+                match &mut object.kind {
+                    ObjectKind::SkateBoard { rot, .. } => rot.0 -= 1.0 * delta_time.as_secs_f64(),
+                }
+            }
+            if self.keys_pressed.contains(&Key::Left) {
+                match &mut object.kind {
+                    ObjectKind::SkateBoard { rot, .. } => rot.1 -= 1.0 * delta_time.as_secs_f64(),
+                }
+            }
+            if self.keys_pressed.contains(&Key::Right) {
+                match &mut object.kind {
+                    ObjectKind::SkateBoard { rot, .. } => rot.1 += 1.0 * delta_time.as_secs_f64(),
+                }
+            }
+            if self.keys_pressed.contains(&Key::Down) {
+                match &mut object.kind {
+                    ObjectKind::SkateBoard { pos, .. } => pos.1 -= 0.5 * delta_time.as_secs_f64(),
+                }
+            }
+            if self.keys_pressed.contains(&Key::Up) {
+                match &mut object.kind {
+                    ObjectKind::SkateBoard { pos, .. } => pos.1 += 0.5 * delta_time.as_secs_f64(),
+                }
+            }
+            object.update(delta_time);
+        }
+    }
+
+    fn render(&mut self, r: &mut R) {
+        let mut scene = Scene::new();
+        for object in &self.objects {
+            object.render(&mut scene);
+        }
+        scene.render(r, V3(0.0, 0.0, -1.0));
+    }
+
+    fn event(&mut self, event: engine::Event) {
+        match event {
+            engine::Event::KeyDown { key } => self.keys_pressed.insert(key),
+            engine::Event::KeyUp { key } => self.keys_pressed.remove(&key),
+        };
+    }
+}
+
+struct Object {
+    kind: ObjectKind,
+    id: u32,
+}
+
+enum ObjectKind {
+    SkateBoard {
+        pos: V3,
+        vel: V3,
+        rot: V3,
+        nyoom_factor: f64,
+        pivot_deg: f64,
+    },
+}
+
+struct ShapeGroupShape {
+    shape: Shape,
+    offset: V3,
+}
+
+struct ShapeGroup {
+    pub shapes: Vec<ShapeGroupShape>,
+}
+
+impl ShapeGroup {
+    pub fn new(shapes: Vec<ShapeGroupShape>) -> Self {
+        Self { shapes }
+    }
+    pub fn rotate(mut self, rot: V3) -> Self {
+        for shape in &mut self.shapes {
+            shape.shape = shape
+                .shape
+                .translate(shape.offset)
+                .rotate(rot)
+                .translate(shape.offset * -1.0);
+        }
+        self
+    }
+    pub fn translate(mut self, offset: V3) -> Self {
+        for shape in &mut self.shapes {
+            shape.shape = shape.shape.translate(offset);
+        }
+        self
+    }
+    pub fn draw(self, pos: V3, scene: &mut Scene, outline_color: Color, fill_color: Color) {
+        for shape in self.shapes {
+            scene.draw_shape(
+                pos,
+                &shape.shape.translate(shape.offset),
+                outline_color,
+                fill_color,
+            );
+        }
+    }
+}
+
+impl Object {
+    fn update(&mut self, delta_time: Duration) {
+        match &mut self.kind {
+            ObjectKind::SkateBoard {
+                pos,
+                vel,
+                nyoom_factor,
+                pivot_deg: pivot_factor,
+                ..
+            } => {
+                vel.0 = *pivot_factor * delta_time.as_secs_f64();
+                *pos += *vel * delta_time.as_secs_f64();
+                *nyoom_factor += 16.0 * delta_time.as_secs_f64();
+
+                // rot.0 += delta_time.as_secs_f64() * PI * 1.0;
+                // rot.1 += delta_time.as_secs_f64() * PI * 0.2;
+                // rot.2 += delta_time.as_secs_f64() * PI * 2.0;
+            }
+        }
+    }
+
+    fn render(&self, scene: &mut Scene) {
+        match self.kind {
+            ObjectKind::SkateBoard {
+                pos,
+                rot,
+                nyoom_factor,
+                pivot_deg: pivot_factor,
+                ..
+            } => {
+                let board_size = V3(0.175, 0.005, 0.05);
+                let trucks = {
+                    let anchor_size = V3(0.005, 0.01, 0.005);
+                    let anchor_y = -anchor_size.1 - board_size.1 * 0.5;
+                    let pivot = vec![
+                        ShapeGroupShape {
+                            shape: Shape::new_cube(anchor_size),
+                            offset: V3(
+                                anchor_size.0 * -0.5 + board_size.0 * 0.4,
+                                anchor_y,
+                                anchor_size.2 * -0.5,
+                            ),
+                        },
+                        ShapeGroupShape {
+                            shape: Shape::new_cube(anchor_size),
+                            offset: V3(
+                                anchor_size.0 * -0.5 - board_size.0 * 0.4,
+                                anchor_y,
+                                anchor_size.2 * -0.5,
+                            ),
+                        },
+                    ];
+                    let wheel_rail_size = V3(anchor_size.0, anchor_size.0, board_size.2 * 0.8);
+                    let wheel_rail_y = anchor_y - wheel_rail_size.1;
+                    let wheel_rail = vec![
+                        ShapeGroupShape {
+                            shape: Shape::new_cube(wheel_rail_size),
+                            offset: V3(
+                                wheel_rail_size.0 * -0.5 + board_size.0 * 0.4,
+                                wheel_rail_y,
+                                wheel_rail_size.2 * -0.5,
+                            ),
+                        },
+                        ShapeGroupShape {
+                            shape: Shape::new_cube(wheel_rail_size),
+                            offset: V3(
+                                wheel_rail_size.0 * -0.5 - board_size.0 * 0.4,
+                                wheel_rail_y,
+                                wheel_rail_size.2 * -0.5,
+                            ),
+                        },
+                    ];
+                    let wheel_size = V3(0.01, 0.01, 0.0025);
+                    let wheel_y = wheel_rail_y - wheel_size.1 * 0.25;
+                    let wheel_rot = V3(0.0, 0.0, nyoom_factor);
+                    let wheel_rot_trans = V3(0.5, 0.5, 0.0);
+                    let wheel = vec![
+                        ShapeGroupShape {
+                            shape: Shape::new_cube(wheel_size)
+                                .translate(wheel_size * wheel_rot_trans * -1.0)
+                                .rotate(wheel_rot)
+                                .translate(wheel_size * wheel_rot_trans),
+                            offset: V3(
+                                wheel_size.0 * -0.5 + board_size.0 * 0.4,
+                                wheel_y,
+                                wheel_rail_size.2 * -0.5 - wheel_size.2,
+                            ),
+                        },
+                        ShapeGroupShape {
+                            shape: Shape::new_cube(wheel_size)
+                                .translate(wheel_size * wheel_rot_trans * -1.0)
+                                .rotate(wheel_rot)
+                                .translate(wheel_size * wheel_rot_trans),
+
+                            offset: V3(
+                                wheel_size.0 * -0.5 - board_size.0 * 0.4,
+                                wheel_y,
+                                wheel_rail_size.2 * -0.5 - wheel_size.2,
+                            ),
+                        },
+                        ShapeGroupShape {
+                            shape: Shape::new_cube(wheel_size)
+                                .translate(wheel_size * wheel_rot_trans * -1.0)
+                                .rotate(wheel_rot)
+                                .translate(wheel_size * wheel_rot_trans),
+
+                            offset: V3(
+                                wheel_size.0 * -0.5 + board_size.0 * 0.4,
+                                wheel_y,
+                                wheel_rail_size.2 * 0.5,
+                            ),
+                        },
+                        ShapeGroupShape {
+                            shape: Shape::new_cube(wheel_size)
+                                .translate(wheel_size * wheel_rot_trans * -1.0)
+                                .rotate(wheel_rot)
+                                .translate(wheel_size * wheel_rot_trans),
+
+                            offset: V3(
+                                wheel_size.0 * -0.5 - board_size.0 * 0.4,
+                                wheel_y,
+                                wheel_rail_size.2 * 0.5,
+                            ),
+                        },
+                    ];
+                    vec![pivot, wheel_rail, wheel].into_iter().flatten()
+                };
+                let board_pivot_trans = V3(0.0, 0.5, 0.5);
+                let mut board = vec![ShapeGroupShape {
+                    shape: Shape::new_cube(board_size)
+                        .translate(board_size * board_pivot_trans * -1.0)
+                        .rotate(V3(pivot_factor * (PI / 180.0), 0.0, 0.0))
+                        .translate(board_size * board_pivot_trans),
+                    offset: board_size * -0.5,
+                }];
+                board.extend(trucks);
+                let board = ShapeGroup::new(board).rotate(rot);
+                board.draw(pos, scene, Color::Green, Color::Black);
+                scene.draw_shape(
+                    V3(-0.5, -5.0, 0.0),
+                    &Shape::new_cube(V3(1.0, 0.0, 100.0)),
+                    Color::Red,
+                    Color::Red,
+                );
+            }
+        }
+    }
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let mut sdl_io = engine::SdlIo::new()?;
+    let mut game = Game::new();
+    let mut objects: Vec<ObjectKind> = Vec::new();
+    objects.push(ObjectKind::SkateBoard {
+        pos: V3(0.0, -0.1, -0.6),
+        vel: V3(0.0, 0.0, 0.0),
+        rot: V3(0.0, PI * 0.5, 0.0),
+        nyoom_factor: 0.0,
+        pivot_deg: 0.0,
+    });
+
+    for object in objects {
+        game.spawn(object)
+    }
+
+    sdl_io.run(&mut game);
+    Ok(())
+}

game/src/main.rs

@@ -98,6 +98,7 @@ enum ObjectKind {
         pos: V3,
         vel: V3,
         rot: V3,
+        nyoom_factor: f64,
     },
     Obstacle {
         pos: V3,
@@ -158,11 +159,17 @@ impl ShapeGroup {
 impl Object {
     fn update(&mut self, delta_time: Duration) {
         match &mut self.kind {
-            ObjectKind::SkateBoard { pos, vel, rot } => {
+            ObjectKind::SkateBoard {
+                pos,
+                vel,
+                nyoom_factor,
+                rot,
+            } => {
                 *pos += *vel * delta_time.as_secs_f64();
+                *nyoom_factor += 16.0 * delta_time.as_secs_f64();
 
                 // rot.0 += delta_time.as_secs_f64() * PI * 1.0;
-                // rot.1 += delta_time.as_secs_f64() * PI * 1.0;
+                rot.1 += delta_time.as_secs_f64() * PI * 0.2;
                 // rot.2 += delta_time.as_secs_f64() * PI * 2.0;
             }
             ObjectKind::Obstacle { pos, vel } => {
@@ -187,23 +194,41 @@ impl Object {
 
     fn render(&self, scene: &mut Scene) {
         match self.kind {
-            ObjectKind::SkateBoard { pos, rot, .. } => {
+            ObjectKind::SkateBoard {
-                let camera_pos = V3(0.0, 0.0, -1.0);
+                pos,
-                let board = ShapeGroup::new(vec![
+                rot,
+                nyoom_factor,
+                ..
+            } => {
+                let trucks = {
+                    vec![
                         ShapeGroupShape {
-                        shape: Shape::new_cube(V3(0.2, 0.01, 0.05)),
+                            shape: Shape::new_cube(V3(0.005, 0.01, 0.005)),
+                            offset: V3(0.04 - 0.0025, -0.005, 0.025 - 0.0025),
+                        },
+                        ShapeGroupShape {
+                            shape: Shape::new_cube(V3(0.005, 0.01, 0.005)),
+                            offset: V3(0.14 - 0.0025, -0.005, 0.025 - 0.0025),
+                        },
+                        ShapeGroupShape {
+                            shape: Shape::new_cube(V3(0.0025, 0.0025, 0.05)),
+                            offset: V3(0.04 - 0.0025, -0.005 - 0.01, 0.0),
+                        },
+                        ShapeGroupShape {
+                            shape: Shape::new_cube(V3(0.0025, 0.0025, 0.05)),
+                            offset: V3(0.14 - 0.0025, -0.005 - 0.01, 0.0),
+                        },
+                    ]
+                };
+                let wheels = {};
+                let mut board = vec![ShapeGroupShape {
+                    shape: Shape::new_cube(V3(0.175, 0.005, 0.05)),
                     offset: V3(0.0, 0.0, 0.0),
-                    },
+                }];
-                    ShapeGroupShape {
+                board.extend(trucks);
-                        shape: Shape::new_cube(V3(0.02, 0.02, 0.05)),
+                board.extend(wheels);
-                        offset: V3(0.04, -0.02, 0.0),
+                let board = ShapeGroup::new(board)
-                    },
+                    .translate(V3(-0.1, 0.005, -0.0025))
-                    ShapeGroupShape {
-                        shape: Shape::new_cube(V3(0.02, 0.02, 0.05)),
-                        offset: V3(0.14, -0.02, 0.0),
-                    },
-                ])
-                .translate(V3(-0.1, -0.005, -0.0025))
                     .rotate(rot);
                 board.draw(pos, scene, Color::Green, Color::Black);
             }
@@ -257,7 +282,8 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     objects.push(ObjectKind::SkateBoard {
         pos: V3(0.0, -0.1, -0.7),
         vel: V3(0.0, 0.0, 0.0),
-        rot: V3(0.0, PI * 0.5, 0.0),
+        rot: V3(0.0, PI * 0.33, 0.0),
+        nyoom_factor: 0.0,
     });
     objects.push(ObjectKind::Ground {
         original_pos: V3(0.0, -0.25, -0.6),