From 807c0b0df59b597ed3682a06be00eb058b03bdb2 Mon Sep 17 00:00:00 2001
From: Dylan Baker <dylan@pnwbakers.com>
Date: Tue, 22 Dec 2020 15:01:27 -0800
Subject: [PATCH] waffle: Add support for non-linux platforms

Waffle works perfectly well on macOS and Windows. Because the meson
options do proper dependency checking already, we can just leave them
out. This has the additional benefit of allowing gbm, surfaceless_egl
and x11_egl supoort to be built on Linux, which are useful in
conjunction with the piglit test suite.
---
 pkgs/development/libraries/waffle/default.nix | 23 ++++++++++++-------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/pkgs/development/libraries/waffle/default.nix b/pkgs/development/libraries/waffle/default.nix
index aa59bf6fb9e..0f1e36b3579 100644
--- a/pkgs/development/libraries/waffle/default.nix
+++ b/pkgs/development/libraries/waffle/default.nix
@@ -4,15 +4,20 @@
 , meson
 , ninja
 , libGL
-, libglvnd
+, libglvnd ? null
 , makeWrapper
 , pkg-config
-, wayland
-, libxcb
-, libX11
 , python3
+, x11Support ? true, libxcb ? null, libX11 ? null
+, waylandSupport ? true, wayland ? null
+, useGbm ? true, mesa ? null, libudev ? null
 }:
 
+assert x11Support -> (libxcb != null && libX11 != null);
+assert waylandSupport -> wayland != null;
+assert useGbm -> (mesa != null && libudev != null);
+assert with stdenv.hostPlatform; isUnix && !isDarwin -> libglvnd != null;
+
 stdenv.mkDerivation rec {
   pname = "waffle";
   version = "1.6.1";
@@ -27,10 +32,16 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     libGL
+  ] ++ stdenv.lib.optionals (with stdenv.hostPlatform; isUnix && !isDarwin) [
     libglvnd
+  ] ++ stdenv.lib.optionals x11Support [
     libX11
     libxcb
+  ] ++ stdenv.lib.optionals waylandSupport [
     wayland
+  ] ++ stdenv.lib.optionals useGbm [
+    mesa
+    libudev
   ];
 
   nativeBuildInputs = [
@@ -41,10 +52,6 @@ stdenv.mkDerivation rec {
     python3
   ];
 
-  mesonFlags = [
-    "-Dgbm=disabled"
-  ];
-
   postInstall = ''
     wrapProgram $out/bin/wflinfo \
       --prefix LD_LIBRARY_PATH : ${stdenv.lib.makeLibraryPath [ libGL libglvnd ]}