intial loading

src/main.rs

@@ -1,3 +1,105 @@
-fn main() {
-    println!("Hello, world!");
+use miette::Diagnostic;
+use std::env::args;
+use std::fs;
+use thiserror::Error;
+use three_d::*;
+use vbsp::{Bsp, Handle};
+
+#[derive(Debug, Error, Diagnostic)]
+enum Error {
+    #[error(transparent)]
+    Three(#[from] Box<dyn std::error::Error>),
+    #[error(transparent)]
+    #[diagnostic(transparent)]
+    Bsp(#[from] vbsp::BspError),
+    #[error(transparent)]
+    IO(#[from] std::io::Error),
+    #[error("{0}")]
+    Other(&'static str),
+}
+
+fn main() -> Result<(), Error> {
+    miette::set_panic_hook();
+
+    let mut args = args();
+    let bin = args.next().unwrap();
+    let file = match args.next() {
+        Some(file) => file,
+        None => {
+            eprintln!("usage: {} <file.bsp>", bin);
+            return Ok(());
+        }
+    };
+
+    let window = Window::new(WindowSettings {
+        title: file.clone(),
+        max_size: Some((1280, 720)),
+        ..Default::default()
+    })?;
+
+    let data = fs::read(&file)?;
+    let bsp = Bsp::read(&data)?;
+    let world_model = bsp.models().next().ok_or(Error::Other("No world model"))?;
+
+    let context = window.gl().unwrap();
+
+    let mut camera = Camera::new_perspective(
+        &context,
+        window.viewport().unwrap(),
+        vec3(0.0, 0.0, 2.0),
+        vec3(0.0, 0.0, 0.0),
+        vec3(0.0, 1.0, 0.0),
+        degrees(45.0),
+        0.1,
+        10.0,
+    )?;
+
+    let cpu_mesh = model_to_mesh(world_model);
+
+    // Construct a model, with a default color material, thereby transferring the mesh data to the GPU
+    let mut model = Model::new(&context, &cpu_mesh)?;
+
+    // Start the main render loop
+    window.render_loop(move |frame_input: FrameInput| // Begin a new frame with an updated frame input
+        {
+            // Ensure the viewport matches the current window viewport which changes if the window is resized
+            camera.set_viewport(frame_input.viewport).unwrap();
+
+            // Start writing to the screen and clears the color and depth
+            Screen::write(&context, ClearState::color_and_depth(0.8, 0.8, 0.8, 1.0, 1.0), || {
+                // Set the current transformation of the triangle
+                model.set_transformation(Mat4::from_angle_y(radians((frame_input.accumulated_time * 0.005) as f32)));
+
+                // Render the triangle with the color material which uses the per vertex colors defined at construction
+                model.render(&camera, &Lights::default())?;
+                Ok(())
+            }).unwrap();
+
+            FrameOutput::default()
+        })?;
+    Ok(())
+}
+
+fn model_to_mesh(model: Handle<vbsp::data::Model>) -> CPUMesh {
+    let size = [
+        model.maxs.z - model.mins.z,
+        model.maxs.y - model.mins.y,
+        model.maxs.x - model.mins.x,
+    ]
+    .into_iter()
+    .max_by(|a, b| a.partial_cmp(b).unwrap())
+    .unwrap();
+    let positions: Vec<f32> = model
+        .faces()
+        .filter(|face| face.is_visible())
+        .flat_map(|face| face.triangulate())
+        .flat_map(|triangle| triangle.into_iter())
+        .flat_map(|vertex| vertex.iter())
+        .map(|c| c / size)
+        .collect();
+
+    CPUMesh {
+        positions,
+        ..Default::default()
+    }
 }