From 8781c448a41bcb74c1f723efefc7d8bdf6f8dbd2 Mon Sep 17 00:00:00 2001
From: Asahi Lina <lina@asahilina.net>
Date: Wed, 30 Aug 2023 15:42:48 +0900
Subject: [PATCH] driconf: Disable fp16 for browsers

There are way too many broken WebGL apps using the wrong precision
qualifiers, which causes anything from jittery geometry to complete
breakage (e.g. QuakeJS and other games).

In addition, a Firefox bug is breaking basic canvas rendering for the
same reason (mozilla bug #1845309).

Let's just disable fp16 for browsers. There is no hope of getting all
this broken stuff fixed.

Signed-off-by: Asahi Lina <lina@asahilina.net>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Eric Engestrom <eric@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25052>
---
 src/util/00-mesa-defaults.conf | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/src/util/00-mesa-defaults.conf b/src/util/00-mesa-defaults.conf
index b6a4aeb9a59..80a6c80c56f 100644
--- a/src/util/00-mesa-defaults.conf
+++ b/src/util/00-mesa-defaults.conf
@@ -915,6 +915,39 @@ TODO: document the other workarounds.
             <option name="vk_x11_override_min_image_count" value="3" />
         </application>
 
+        <!-- Disable fp16 support for browsers, since there is too much
+             broken WebGL out there that uses the wrong precision.
+             Bonus workaround for Firefox bug #1845309. -->
+        <application name="Firefox" executable="firefox">
+            <option name="no_fp16" value="true" />
+        </application>
+        <application name="Firefox ESR" executable="firefox-esr">
+            <option name="no_fp16" value="true" />
+        </application>
+        <application name="Chromium" executable="chromium">
+            <option name="no_fp16" value="true" />
+        </application>
+        <application name="Google Chrome" executable="chrome">
+            <option name="no_fp16" value="true" />
+        </application>
+        <application name="Iceweasel" executable="iceweasel">
+            <option name="no_fp16" value="true" />
+        </application>
+        <application name="Epiphany" executable="epiphany">
+            <option name="no_fp16" value="true" />
+        </application>
+        <application name="Konqueror" executable="konqueror">
+            <option name="no_fp16" value="true" />
+        </application>
+        <application name="Falkon" executable="falkon">
+            <option name="no_fp16" value="true" />
+        </application>
+        <application name="Seamonkey" executable="seamonkey">
+            <option name="no_fp16" value="true" />
+        </application>
+        <application name="Waterfox" executable="waterfox">
+            <option name="no_fp16" value="true" />
+        </application>
     </device>
     <!-- vmwgfx doesn't like full buffer swaps and can't sync to vertical retraces.-->
     <device driver="vmwgfx">