Added sdl-demo

sdl-demo/.cargo/config.toml

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+[env]
+RESOURCE_DIR = { value = "rsc", relative = true }

sdl-demo/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "libc"
+version = "0.2.134"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "329c933548736bc49fd575ee68c89e8be4d260064184389a5b77517cddd99ffb"
+
+[[package]]
+name = "sdl-demo"
+version = "0.1.0"
+dependencies = [
+ "sdl2",
+]
+
+[[package]]
+name = "sdl2"
+version = "0.35.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7959277b623f1fb9e04aea73686c3ca52f01b2145f8ea16f4ff30d8b7623b1a"
+dependencies = [
+ "bitflags",
+ "lazy_static",
+ "libc",
+ "sdl2-sys",
+]
+
+[[package]]
+name = "sdl2-sys"
+version = "0.35.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3586be2cf6c0a8099a79a12b4084357aa9b3e0b0d7980e3b67aaf7a9d55f9f0"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "version-compare",
+]
+
+[[package]]
+name = "version-compare"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe88247b92c1df6b6de80ddc290f3976dbdf2f5f5d3fd049a9fb598c6dd5ca73"

sdl-demo/Cargo.toml

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+[package]
+name = "sdl-demo"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies.sdl2]
+version = "0.35"
+default-features = false
+features = [ "ttf", "image" ]

sdl-demo/src/main.rs

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+extern crate sdl2;
+
+use sdl2::image::LoadTexture;
+use sdl2::pixels::Color;
+use sdl2::event::Event;
+use sdl2::keyboard::Keycode;
+use sdl2::ttf;
+use sdl2::image;
+use sdl2::rect::Rect;
+
+const RESOURCE_DIR: &str = env!("RESOURCE_DIR");
+
+fn main() {
+    let sdl_ctx = sdl2::init().unwrap_or_else(|_| {
+        eprintln!("error: could not init sdl2");
+        panic!()
+    });
+    let video_ctx = sdl_ctx.video().unwrap_or_else(|_| {
+        eprintln!("error: could not init sdl2 video subsystem");
+        panic!()
+    });
+
+    let ttf_ctx = ttf::init().unwrap_or_else(|_| {
+        eprintln!("error: could not init sdl2 font subsystem");
+        panic!()
+    });
+    let fira_code_path = RESOURCE_DIR.to_owned() + "/fonts/fira-code-regular.ttf";
+    let fira_code = ttf_ctx.load_font(fira_code_path, 64).unwrap_or_else(|_| {
+        eprintln!("error: could not load font");
+        panic!()
+    });
+
+    let _ = image::init(image::InitFlag::PNG).unwrap_or_else(|_| {
+        eprintln!("error: could not init sdl2 image subsystem");
+        panic!()
+    });
+
+    let window = video_ctx.window("Rust SDL2 Demo", 1000, 1000)
+        .position_centered().build().unwrap_or_else(|_| {
+            eprintln!("error: could not create window");
+            panic!()
+        });
+    let mut canvas = window.into_canvas().build().unwrap_or_else(|_| {
+        eprintln!("error: could not create canvas for window");
+        panic!()
+    });
+
+    draw_loop(&sdl_ctx, &mut canvas, &fira_code);
+}
+
+fn draw_loop(cxt: &sdl2::Sdl, 
+             canvas: &mut sdl2::render::WindowCanvas,
+             font: &ttf::Font) {
+    canvas.set_draw_color(Color::WHITE);
+    canvas.clear();
+    canvas.present();
+    let texture_creator = canvas.texture_creator();
+    let img_path = RESOURCE_DIR.to_owned() + "/img/ina.png";
+    let img_png = texture_creator.load_texture(img_path).unwrap_or_else(|_| {
+        eprintln!("error: could not load ina png");
+        panic!()
+    });
+    let img_box = get_box_for_texture(canvas.window(), &img_png, 0.3);
+    let mut event_pump = cxt.event_pump().unwrap();
+    let mut color: u8 = 255;
+    'game_loop: loop {
+        let color1 = Color::RGB(color, color, color);
+        let color2 = Color::RGB(255 - color, 255 - color, 255 - color);
+        canvas.set_draw_color(color1);
+        canvas.clear();
+        
+        canvas.set_draw_color(color2);
+        let _ = canvas.fill_rect(Rect::new(100, 100, 800, 800));
+
+        canvas.set_draw_color(color1);
+        let _ = canvas.fill_rect(Rect::new(200, 200, 600, 600));
+
+        canvas.set_draw_color(color2);
+        let _ = canvas.fill_rect(Rect::new(300, 300, 400, 400));
+
+        canvas.set_draw_color(color1);
+        let _ = canvas.fill_rect(Rect::new(400, 400, 200, 200));
+
+        canvas.set_draw_color(color2);
+        let text_surround_box = get_box_for_text(canvas.window(), font, "SDL2 Rust Demo");
+        let _ = canvas.fill_rect(text_surround_box);
+        canvas.set_draw_color(color1);
+        let _ = canvas.draw_rect(text_surround_box);
+        let text_suface = font.render("SDL2 Rust Demo").solid(color1).unwrap();
+        let text_texture = texture_creator.create_texture_from_surface(text_suface).unwrap();
+        let _ = canvas.copy(&text_texture, None, text_surround_box);
+
+        let _ = canvas.copy(&img_png, None, img_box);
+
+        for evt in event_pump.poll_iter() {
+            match evt {
+                Event::Quit {..} |
+                Event::KeyDown { keycode: Some(Keycode::Q), .. } |
+                Event::KeyDown { keycode: Some(Keycode::Escape), .. } => break 'game_loop,
+                Event::KeyDown { keycode: Some(Keycode::Equals), .. } => if color < 255 { color += 5 },
+                Event::KeyDown { keycode: Some(Keycode::Minus), .. } => if color > 0 { color -= 5 },
+                _ => {}
+            }
+        }
+        canvas.present();
+    }
+}
+
+fn get_box_for_text(win: &sdl2::video::Window, font: &ttf::Font, text: &str) -> Rect {
+    let (ww, wh) = win.size();
+    let (tw, th) = font.size_of(text).unwrap();
+    let cx = (ww as f32 / 2.0) as i32;
+    let cy = (wh as f32 / 2.0) as i32;
+    Rect::new(
+        cx - (tw as f32 / 2.0) as i32,
+        cy - (th as f32 / 2.0) as i32,
+        tw,
+        th
+    )
+}
+
+fn get_box_for_texture(win: &sdl2::video::Window, tex: &sdl2::render::Texture, scale: f32) -> Rect {
+    let tq = tex.query();
+    let tw = (tq.width as f32 * scale) as u32;
+    let th = (tq.height as f32 * scale) as u32;
+    let (ww, _) = win.size();
+    Rect::new(
+        ((ww as f32 / 2.0) - (tw as f32 / 2.0)) as i32,
+        10,
+        tw,
+        th
+    )
+}