From 915c60e9c3adbc46023f190ee9c0f4bcc7c6b914 Mon Sep 17 00:00:00 2001
From: Nicolas Silva <nical@fastmail.com>
Date: Wed, 11 Oct 2023 10:53:35 +0200
Subject: [PATCH] Allow overriding validation and debug flags via an env var

---
 wgpu-core/src/instance.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/wgpu-core/src/instance.rs b/wgpu-core/src/instance.rs
index 90126f15ee3..690cd0868c8 100644
--- a/wgpu-core/src/instance.rs
+++ b/wgpu-core/src/instance.rs
@@ -71,8 +71,24 @@ pub struct Instance {
 
 impl Instance {
     pub fn new(name: &str, instance_desc: wgt::InstanceDescriptor) -> Self {
+        fn env(key: &str) -> Option<bool> {
+            std::env::var(key).ok().map(|s| {
+                match s.as_str() {
+                    "0" => false,
+                    _ => true,
+                }
+            })
+        }
         fn init<A: HalApi>(_: A, instance_desc: &wgt::InstanceDescriptor) -> Option<A::Instance> {
             if instance_desc.backends.contains(A::VARIANT.into()) {
+                let mut flags = instance_desc.flags;
+                if let Some(bit) = env("WGPU_VALIDATION") {
+                    flags.set(wgt::InstanceFlags::VALIDATION, bit);
+                }
+                if let Some(bit) = env("WGPU_DEBUG") {
+                    flags.set(wgt::InstanceFlags::DEBUG, bit);
+                }
+
                 let hal_desc = hal::InstanceDescriptor {
                     name: "wgpu",
                     flags: instance_desc.flags,