From 5fdf36dbb1e842f87abda0ea9cac50f95978df7a Mon Sep 17 00:00:00 2001
From: Carter Anderson <mcanders1@gmail.com>
Date: Sun, 16 Aug 2020 01:11:17 -0700
Subject: [PATCH] add optional wgpu tracing feature

---
 Cargo.toml                            | 1 +
 crates/bevy_wgpu/Cargo.toml           | 1 +
 crates/bevy_wgpu/src/wgpu_renderer.rs | 7 ++++++-
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Cargo.toml b/Cargo.toml
index 179c075e87..cb5fbf4d54 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,7 @@ exclude = ["assets/**/*", "tools/**/*", ".github/**/*", "crates/**/*"]
 [features]
 default = ["bevy_audio", "bevy_gltf", "bevy_wgpu", "bevy_winit", "png", "hdr", "mp3"]
 profiler = ["bevy_ecs/profiler", "bevy_diagnostic/profiler"]
+wgpu_trace = ["bevy_wgpu/trace"]
 
 # Image format support for texture loading (PNG and HDR are enabled by default)
 png = ["bevy_render/png"]
diff --git a/crates/bevy_wgpu/Cargo.toml b/crates/bevy_wgpu/Cargo.toml
index 4d5eb8dbbd..11a9807aa6 100644
--- a/crates/bevy_wgpu/Cargo.toml
+++ b/crates/bevy_wgpu/Cargo.toml
@@ -11,6 +11,7 @@ keywords = ["bevy"]
 
 [features]
 default = ["bevy_winit"]
+trace = ["wgpu/trace"]
 
 [dependencies]
 # bevy
diff --git a/crates/bevy_wgpu/src/wgpu_renderer.rs b/crates/bevy_wgpu/src/wgpu_renderer.rs
index 06837ca039..11da00a263 100644
--- a/crates/bevy_wgpu/src/wgpu_renderer.rs
+++ b/crates/bevy_wgpu/src/wgpu_renderer.rs
@@ -27,6 +27,11 @@ impl WgpuRenderer {
             .await
             .expect("Unable to find a GPU! Make sure you have installed required drivers!");
 
+        #[cfg(feature = "trace")]
+        let trace_path = Some(std::path::Path::new("wgpu_trace"));
+        #[cfg(not(feature = "trace"))]
+        let trace_path = None;
+
         let (device, queue) = adapter
             .request_device(
                 &wgpu::DeviceDescriptor {
@@ -34,7 +39,7 @@ impl WgpuRenderer {
                     limits: wgpu::Limits::default(),
                     shader_validation: true,
                 },
-                None,
+                trace_path,
             )
             .await
             .unwrap();