From 22b4111ea9d9728c62819993263875062ecb399c Mon Sep 17 00:00:00 2001
From: Kira Bruneau <kira.bruneau@pm.me>
Date: Sun, 14 May 2023 13:23:42 -0400
Subject: [PATCH] vkbasalt: add bitness suffix to layer name

---
 pkgs/tools/graphics/vkbasalt/default.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/pkgs/tools/graphics/vkbasalt/default.nix b/pkgs/tools/graphics/vkbasalt/default.nix
index af267e6688b..4bfeed0bc12 100644
--- a/pkgs/tools/graphics/vkbasalt/default.nix
+++ b/pkgs/tools/graphics/vkbasalt/default.nix
@@ -33,6 +33,14 @@ stdenv.mkDerivation (finalAttrs: {
       "$out/share/vulkan/implicit_layer.d/vkBasalt32.json"
   '';
 
+  # We need to give the different layers separate names or else the loader
+  # might try the 32-bit one first, fail and not attempt to load the 64-bit
+  # layer under the same name.
+  postFixup = ''
+    substituteInPlace "$out/share/vulkan/implicit_layer.d/vkBasalt.json" \
+      --replace "VK_LAYER_VKBASALT_post_processing" "VK_LAYER_VKBASALT_post_processing_${toString stdenv.hostPlatform.parsed.cpu.bits}"
+  '';
+
   meta = with lib; {
     description = "A Vulkan post processing layer for Linux";
     homepage = "https://github.com/DadSchoorse/vkBasalt";