game engine progress

unnamed-game-engine/.gitignore

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+/target

unnamed-game-engine/Cargo.lock

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+# 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 = "unnamed-game-engine"
+version = "0.1.0"
+dependencies = [
+ "sdl3",
+]

unnamed-game-engine/Cargo.toml

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+[package]
+name = "unnamed-game-engine"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+sdl3 = "0.17.3"

unnamed-game-engine/src/engine/error.rs

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+pub type Error = String;

unnamed-game-engine/src/engine/game.rs

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+
+
+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 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,
+    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();
+
+        Ok(Self {
+            sdl_context,
+            video_subsystem,
+            canvas,
+            event_pump,
+            io,
+            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);
+            }
+
+        }
+    }
+}

unnamed-game-engine/src/engine/game_example.rs

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+
+pub trait GameObject {
+    fn update(deltaTime: Duration);
+    fn render();
+}
+
+pub struct Game<GameObjectTypeetc: GameObject> {
+
+}
+

unnamed-game-engine/src/engine/mod.rs

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+pub mod object;
+pub mod game;
+mod system;
+mod error;

unnamed-game-engine/src/engine/object.rs

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

unnamed-game-engine/src/engine/system.rs

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+use super::error::Error;
+
+
+pub trait System {
+
+    fn on_add(&self) -> Result<(), Error> {
+        Ok(())
+    }
+    
+    fn on_update(&self) -> Result<(), Error> {
+        Ok(())
+    }
+
+    fn on_remove(&self) -> Result<(), Error> {
+        Ok(())
+    }
+}

unnamed-game-engine/src/main.rs

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+mod engine;
+
+use crate::engine::game::Game;
+
+
+fn main() {
+    
+    let mut game = Game::new().unwrap();
+    game.run();
+    println!("Hello, world!");
+}