From f0c7e990f7b63b38c2024c201101a14a499cac19 Mon Sep 17 00:00:00 2001
From: Zicklag <zicklag@katharostech.com>
Date: Tue, 13 Jul 2021 11:21:06 -0500
Subject: [PATCH] Disable Intel Fastclear in GL Backend

This works around a Mesa bug on Intel cards:

- https://gitlab.freedesktop.org/mesa/mesa/-/issues/2565
- https://github.com/gfx-rs/wgpu/issues/1627#issuecomment-877854185
---
 wgpu-hal/src/gles/egl.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/wgpu-hal/src/gles/egl.rs b/wgpu-hal/src/gles/egl.rs
index dc89f4b662..da04883345 100644
--- a/wgpu-hal/src/gles/egl.rs
+++ b/wgpu-hal/src/gles/egl.rs
@@ -396,6 +396,11 @@ impl crate::Instance<super::Api> for Instance {
             None
         };
 
+        // Workaround Mesa driver bug on Intel cards by disabling fastclear:
+        // https://gitlab.freedesktop.org/mesa/mesa/-/issues/2565
+        // https://github.com/gfx-rs/wgpu/issues/1627#issuecomment-877854185
+        std::env::set_var("INTEL_DEBUG", "nofc");
+
         let display = if let (Some(library), Some(egl)) =
             (wayland_library, egl.upcast::<egl::EGL1_5>())
         {