worked on 3d rendering

game/.gitignore

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

game/src/engine/game.rs

@@ -1,69 +1,58 @@
-
-
-use std::time::Instant;
-
-use sdl3::render::Canvas;
-use sdl3::{EventPump, Sdl, VideoSubsystem};
-use sdl3::video::Window;
 use sdl3::pixels::Color;
-use sdl3::event::Event;
-use sdl3::keyboard::Keycode;
+
+use crate::engine::math::{V2, V3};
+use std::{marker::PhantomData, time::Duration};
 
 use super::error::Error;
-use super::object::Object;
 
-pub struct Game<Io, O: Object> {
-    sdl_context: Sdl,
-    video_subsystem: VideoSubsystem,
-    canvas: Canvas<Window>,
-    event_pump: EventPump,
-    io: Io,
+pub trait Object<R: Renderer> {
+    fn update(&mut self, delta: Duration);
+    fn render(&mut self, r: &mut R);
+}
+
+pub trait Io<R: Renderer, O: Object<R>> {
+    fn run(&mut self, game: &mut Game<R, O>);
+}
+
+pub trait Renderer {
+    fn draw_rect(&mut self, pos: V2, size: V2, color: Color);
+    fn point(&mut self, pos: V2, color: Color);
+    fn draw_line(&mut self, from: V2, to: V2, color: Color);
+    fn draw_cube(&mut self, pos: V3, size: V3, outline_colors: Color, fill_color: Color);
+}
+
+pub enum Event {
+    Exit,
+}
+
+pub struct Game<R: Renderer, O: Object<R>> {
+    _phantom_data: PhantomData<R>,
     objects: Vec<O>,
 }
 
-impl<Io, O: Object> Game<Io, O> {
-    pub fn new(io: Io) -> Result<Self, Error> {
-        let sdl_context = sdl3::init().unwrap();
-        let video_subsystem = sdl_context.video().unwrap();
-        let window = video_subsystem.window("Game", 1280, 720).position_centered().build().unwrap();
-        let mut canvas = window.into_canvas();
-        
-        canvas.set_draw_color(Color::BLACK);
-        canvas.clear();
-        canvas.present();
-        
-        let event_pump = sdl_context.event_pump().unwrap();
-
+impl<R: Renderer, O: Object<R>> Game<R, O> {
+    pub fn new() -> Result<Self, Error> {
         Ok(Self {
-            sdl_context,
-            video_subsystem,
-            canvas,
-            event_pump,
-            io,
-            objects: Vec::new()
+            _phantom_data: PhantomData,
+            objects: Vec::new(),
         })
     }
 
-    pub fn run(&mut self) {
-        let mut time_before = Instant::now();
-        let time_per_frame = 1_000_000_000 / 60;
-        'running: loop {
-            for event in self.event_pump.poll_iter() {
-                match event {
-                    Event::Quit {..} |
-                    Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
-                        break 'running
-                    },
-                    _ => {}
-                }
-            }
-            let now = Instant::now();
-            let delta = now - time_before;
-            time_before = now;
-            for object in self.objects.iter_mut() {
-                object.update(delta);
-            }
+    pub fn spawn(&mut self, object: O) {
+        self.objects.push(object);
+    }
 
+    pub fn update(&mut self, delta_time: Duration) {
+        for object in self.objects.iter_mut() {
+            object.update(delta_time);
         }
     }
-}
+
+    pub fn render(&mut self, r: &mut R) {
+        for object in self.objects.iter_mut() {
+            object.render(r);
+        }
+    }
+
+    pub fn event(&mut self, event: Event) {}
+}

game/src/engine/game_example.rs

@@ -1,10 +0,0 @@
-
-pub trait GameObject {
-    fn update(deltaTime: Duration);
-    fn render();
-}
-
-pub struct Game<GameObjectTypeetc: GameObject> {
-
-}
-

game/src/engine/math.rs

@@ -0,0 +1,79 @@
+use std::ops::{Add, AddAssign, Mul, MulAssign};
+
+pub struct V2(pub f64, pub f64);
+
+#[derive(Copy, Clone)]
+pub struct V3(pub f64, pub f64, pub f64);
+
+impl Add for V3 {
+    type Output = V3;
+
+    fn add(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 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 MulAssign<f64> for V3 {
+    fn mul_assign(&mut self, rhs: f64) {
+        *self = *self * rhs;
+    }
+}
+
+impl V3 {
+    pub fn as_2d(&self) -> V2 {
+        V2(self.0 / self.2, self.1 / self.2)
+    }
+}
+
+pub struct Vertex(V3, V3, V3);
+
+pub struct Cube {
+    vertices: [Vertex; 12],
+}
+
+impl Cube {
+    pub fn new(V3(x, y, z): V3, V3(w, h, d): V3) -> Self {
+        Self {
+            vertices: [
+                Vertex(V3(x, y, z), V3(x, y + h, z), V3(x + w, y + h, z)),
+                Vertex(V3(x + w, y + h, z), V3(x + w, y, z), V3(x, y + h, z)),
+                Vertex(V3(x + w, y, z), V3(x + w, y + h, z), V3(x + w, y, z + d)),
+                Vertex(
+                    V3(x + w, y + h, z + d),
+                    V3(x + w, y, z + d),
+                    V3(x, y + h, z + d),
+                ),
+                Vertex(V3(x, y + h, z), V3(x + w, y + h, z), V3(x, y + h, z + d)),
+                Vertex(
+                    V3(x + w, y + h, z),
+                    V3(x + w, y + h, z + d),
+                    V3(x, y + h, z + d),
+                ),
+                Vertex(V3(x, y, z), V3(x, y + h, z), V3(x, y, z + d)),
+                Vertex(V3(x, y + h, z), V3(x, y + h, z + d), V3(x, y, z + d)),
+                Vertex(V3(x, y, z), V3(x + w, y, z), V3(x, y, z + d)),
+                Vertex(V3(x + w, y, z), V3(x + w, y, z + d), V3(x, y, z + d)),
+                Vertex(V3(x, y, z + d), V3(x + w, y, z + d), V3(x, y + h, z + d)),
+                Vertex(
+                    V3(x + w, y, z + d),
+                    V3(x + w, y + h, z + d),
+                    V3(x, y + h, z + d),
+                ),
+            ],
+        }
+    }
+}

game/src/engine/mod.rs

@@ -1,4 +1,9 @@
-pub mod object;
-pub mod game;
+mod error;
+mod game;
+pub mod math;
+mod sdl_io;
 mod system;
-mod error;
+
+pub use game::{Event, Game, Io, Object, Renderer};
+pub use math::V3;
+pub use sdl_io::SdlIo;

game/src/engine/object.rs

@@ -1,8 +0,0 @@
-use std::time::Duration;
-
-pub trait Object {
-    fn update(&mut self, delta: Duration);
-    fn render(&mut self);
-}
-
-

game/src/engine/sdl_io.rs

@@ -0,0 +1,134 @@
+use std::time::Instant;
+
+use sdl3::{
+    event::Event,
+    keyboard::Keycode,
+    pixels::{Color, PixelFormat},
+    render::{Canvas, FRect},
+    video::Window,
+    Sdl, VideoSubsystem,
+};
+
+use crate::engine::{
+    error::Error,
+    game,
+    math::{V2, V3},
+    Object,
+};
+
+static WIDTH: f64 = 1280.0;
+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(Color::BLACK);
+        canvas.clear();
+        canvas.present();
+
+        Ok(Self {
+            sdl_context,
+            video_subsystem,
+            canvas,
+        })
+    }
+
+    pub fn run<O: game::Object<Self>>(&mut self, game: &mut game::Game<Self, O>) {
+        let mut event_pump = self.sdl_context.event_pump().unwrap();
+
+        let mut time_before = Instant::now();
+        let time_per_frame = 1_000_000_000 / 60;
+
+        'running: loop {
+            for event in event_pump.poll_iter() {
+                match event {
+                    Event::Quit { .. }
+                    | Event::KeyDown {
+                        keycode: Some(Keycode::Escape),
+                        ..
+                    } => break 'running,
+                    _ => {}
+                }
+            }
+
+            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(Color::BLACK);
+            self.canvas.clear();
+            game.render(self);
+            self.canvas.present();
+        }
+    }
+
+    fn world_to_screen(&self, v: V2) -> V2 {
+        V2(v.0 + WIDTH / 2.0, HEIGHT / 2.0 - v.1)
+    }
+}
+
+impl game::Renderer for SdlIo {
+    fn draw_rect(&mut self, pos: V2, size: V2, color: Color) {
+        let pos = self.world_to_screen(pos);
+        self.canvas.set_draw_color(color);
+        self.canvas
+            .fill_rect(FRect::new(
+                (pos.0 - size.0 / 2.0) as _,
+                (pos.1 - size.1 / 2.0) as _,
+                size.0 as _,
+                size.1 as _,
+            ))
+            .unwrap();
+    }
+
+    fn point(&mut self, pos: V2, color: Color) {
+        let pos = self.world_to_screen(pos);
+        let size = V2(10.0, 10.0);
+        self.canvas.set_draw_color(color);
+        self.canvas
+            .fill_rect(FRect::new(
+                (pos.0 - size.0 / 2.0) as _,
+                (pos.1 - size.1 / 2.0) as _,
+                10.0,
+                10.0,
+            ))
+            .unwrap();
+    }
+
+    fn draw_line(&mut self, from: V2, to: V2, color: Color) {
+        todo!()
+    }
+
+    fn draw_cube(&mut self, pos: V3, size: V3, outline_color: Color, fill_color: Color) {
+        let V3(x, y, z) = pos;
+        let V3(w, h, d) = size;
+        let points = [
+            pos,
+            V3(x + w, y, z),
+            V3(x, y + h, z),
+            V3(x + w, y + h, z),
+            V3(x, y, z + d / 100.0),
+            V3(x + w, y, z + d / 100.0),
+            V3(x, y + h, z + d / 100.0),
+            V3(x + w, y + h, z + d / 100.0),
+        ];
+        for point in points {
+            self.point(point.as_2d(), outline_color);
+        }
+    }
+}

game/src/main.rs

@@ -1,9 +1,46 @@
+#![allow(dead_code)]
+
+use std::time::Duration;
+
+use sdl3::pixels::Color;
+
+use crate::engine::math::{V2, V3};
+
 mod engine;
 
-use crate::engine::game::Game;
-
-fn main() {
-    // let mut game: Game<(), _> = Game::new(todo!()).unwrap();
-    // game.run();
-    println!("Hello, world!");
+enum Object {
+    Player { pos: V3, vel: V3 },
+}
+
+impl<R: engine::Renderer> engine::Object<R> for Object {
+    fn update(&mut self, delta_time: Duration) {
+        match self {
+            Object::Player { pos, vel } => {
+                *pos += *vel * delta_time.as_secs_f64();
+            }
+        }
+    }
+
+    fn render(&mut self, r: &mut R) {
+        match self {
+            Object::Player { pos, .. } => {
+                // r.draw_rect(V2(pos.0, pos.1), V2(400.0, 400.0));
+                r.draw_cube(*pos, V3(100.0, 100.0, 100.0), Color::GREEN, Color::WHITE);
+            }
+        }
+    }
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let mut sdl_io = engine::SdlIo::new()?;
+    let mut game = engine::Game::<engine::SdlIo, Object>::new()?;
+
+    let player = Object::Player {
+        pos: V3(-50.0, -50.0, 0.0),
+        vel: V3(0.0, 0.0, 1.0),
+    };
+    game.spawn(player);
+
+    sdl_io.run(&mut game);
+    Ok(())
 }