From ab76a63256cd399a65a434976a8bdc79c20e0604 Mon Sep 17 00:00:00 2001
From: Jarrod Doyle <thejarroddoyle@gmail.com>
Date: Thu, 25 Apr 2024 18:07:54 +0100
Subject: [PATCH] Add context builder

---
 src/context.rs | 82 +++++++++++++++++++++++++++++++++++++++++++++++++-
 src/lib.rs     |  2 +-
 2 files changed, 82 insertions(+), 2 deletions(-)

diff --git a/src/context.rs b/src/context.rs
index a05560f..76aeaa3 100644
--- a/src/context.rs
+++ b/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> {
@@ -131,3 +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))
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 5a9020a..27bd34d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,7 +6,7 @@ mod texture;
 pub use self::{
     bind_group::{BindGroupBuilder, BindGroupLayoutBuilder},
     buffer::{BufferExt, BulkBufferBuilder},
-    context::Context,
+    context::{Context, ContextBuilder},
     texture::{Texture, TextureBuilder},
 };