Add context builder

src/context.rs

@@ -2,7 +2,11 @@ use std::sync::Arc;
 
 use thiserror::Error;
 use winit::{
-    dpi::PhysicalSize, event::WindowEvent, event_loop::EventLoopWindowTarget, window::Window,
+    dpi::PhysicalSize,
+    error::{EventLoopError, OsError},
+    event::WindowEvent,
+    event_loop::{EventLoop, EventLoopWindowTarget},
+    window::{Window, WindowBuilder},
 };
 
 #[derive(Error, Debug)]
@@ -15,6 +19,10 @@ pub enum ContextError {
     Adapter,
     #[error("Device request failed: {0}")]
     Device(#[from] wgpu::RequestDeviceError),
+    #[error("Event loop creation failed: {0}")]
+    EventLoop(#[from] EventLoopError),
+    #[error("Window creation failed: {0}")]
+    Os(#[from] OsError),
 }
 
 pub struct Context<'window> {
@@ -29,10 +37,15 @@ pub struct Context<'window> {
 }
 
 impl<'window> Context<'window> {
-    pub async fn new(window: Arc<Window>, limits: wgpu::Limits) -> Result<Self, ContextError> {
+    pub async fn new(
+        window: Arc<Window>,
+        backends: wgpu::Backends,
+        required_features: wgpu::Features,
+        required_limits: wgpu::Limits,
+    ) -> Result<Self, ContextError> {
         log::info!("Initialising WGPU context...");
         let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
-            backends: wgpu::Backends::VULKAN,
+            backends,
             dx12_shader_compiler: Default::default(),
             ..Default::default()
         });
@@ -63,8 +76,8 @@ impl<'window> Context<'window> {
             .request_device(
                 &wgpu::DeviceDescriptor {
                     label: None,
-                    required_features: wgpu::Features::empty(),
-                    required_limits: limits,
+                    required_features,
+                    required_limits,
                 },
                 None,
             )
@@ -126,3 +139,75 @@ impl<'window> Context<'window> {
         handled
     }
 }
+
+pub struct ContextBuilder {
+    title: String,
+    vsync: bool,
+    resolution: PhysicalSize<u32>,
+    backends: wgpu::Backends,
+    features: wgpu::Features,
+    limits: wgpu::Limits,
+}
+
+impl Default for ContextBuilder {
+    fn default() -> Self {
+        Self {
+            title: "Crawl".to_string(),
+            vsync: true,
+            resolution: PhysicalSize::new(1280, 720),
+            backends: Default::default(),
+            features: Default::default(),
+            limits: Default::default(),
+        }
+    }
+}
+
+impl ContextBuilder {
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    pub fn with_title(mut self, title: &str) -> Self {
+        self.title = title.to_string();
+        self
+    }
+
+    pub fn with_vsync(mut self, vsync: bool) -> Self {
+        self.vsync = vsync;
+        self
+    }
+
+    pub fn with_resolution(mut self, width: u32, height: u32) -> Self {
+        self.resolution = PhysicalSize::new(width, height);
+        self
+    }
+
+    pub fn with_backends(mut self, backends: wgpu::Backends) -> Self {
+        self.backends = backends;
+        self
+    }
+
+    pub fn with_features(mut self, features: wgpu::Features) -> Self {
+        self.features = features;
+        self
+    }
+
+    pub fn with_limits(mut self, limits: wgpu::Limits) -> Self {
+        self.limits = limits;
+        self
+    }
+
+    pub async fn build(self) -> Result<(Context<'static>, EventLoop<()>), ContextError> {
+        let event_loop = EventLoop::new()?;
+        let window = Arc::new(
+            WindowBuilder::new()
+                .with_title(self.title)
+                .with_inner_size(self.resolution)
+                .build(&event_loop)?,
+        );
+
+        let context = Context::new(window, self.backends, self.features, self.limits).await?;
+
+        Ok((context, event_loop))
+    }
+}

src/lib.rs

@@ -6,6 +6,8 @@ mod texture;
 pub use self::{
     bind_group::{BindGroupBuilder, BindGroupLayoutBuilder},
     buffer::{BufferExt, BulkBufferBuilder},
-    context::Context,
+    context::{Context, ContextBuilder},
     texture::{Texture, TextureBuilder},
 };
+
+pub use {wgpu, winit};