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Find the host's GL driver when the store's is not the system's

Off NixOS the driver the loader needs belongs to the host, not the store,
so vidya never got a config and the window never opened. The launcher now
hands itself to nixGL unless /run/current-system says it is on NixOS, which
covers a distrobox Arch the same as a bare one.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
nandi committed 2026-08-30T21:14:24-07:00 Browse files
633faad parent: ca3afbe
modified flake.lock +55 -0
@@ -1,5 +1,23 @@
11 {
22 "nodes": {
3+ "flake-utils": {
4+ "inputs": {
5+ "systems": "systems"
6+ },
7+ "locked": {
8+ "lastModified": 1731533236,
9+ "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
10+ "owner": "numtide",
11+ "repo": "flake-utils",
12+ "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
13+ "type": "github"
14+ },
15+ "original": {
16+ "owner": "numtide",
17+ "repo": "flake-utils",
18+ "type": "github"
19+ }
20+ },
321 "glimmer": {
422 "flake": false,
523 "locked": {
@@ -51,6 +69,27 @@
5169 "url": "https://github.com/jolt-lang/jolt"
5270 }
5371 },
72+ "nixgl": {
73+ "inputs": {
74+ "flake-utils": "flake-utils",
75+ "nixpkgs": [
76+ "nixpkgs"
77+ ]
78+ },
79+ "locked": {
80+ "lastModified": 1762090880,
81+ "narHash": "sha256-fbRQzIGPkjZa83MowjbD2ALaJf9y6KMDdJBQMKFeY/8=",
82+ "owner": "nix-community",
83+ "repo": "nixGL",
84+ "rev": "b6105297e6f0cd041670c3e8628394d4ee247ed5",
85+ "type": "github"
86+ },
87+ "original": {
88+ "owner": "nix-community",
89+ "repo": "nixGL",
90+ "type": "github"
91+ }
92+ },
5493 "nixpkgs": {
5594 "locked": {
5695 "lastModified": 1788039129,
@@ -72,8 +111,24 @@
72111 "glimmer": "glimmer",
73112 "jolt-native": "jolt-native",
74113 "jolt-src": "jolt-src",
114+ "nixgl": "nixgl",
75115 "nixpkgs": "nixpkgs"
76116 }
117+ },
118+ "systems": {
119+ "locked": {
120+ "lastModified": 1681028828,
121+ "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
122+ "owner": "nix-systems",
123+ "repo": "default",
124+ "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
125+ "type": "github"
126+ },
127+ "original": {
128+ "owner": "nix-systems",
129+ "repo": "default",
130+ "type": "github"
131+ }
77132 }
78133 },
79134 "root": "root",
@@ -1,5 +1,23 @@
1 {1 {
2 "nodes": {2 "nodes": {
3+ "flake-utils": {
4+ "inputs": {
5+ "systems": "systems"
6+ },
7+ "locked": {
8+ "lastModified": 1731533236,
9+ "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
10+ "owner": "numtide",
11+ "repo": "flake-utils",
12+ "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
13+ "type": "github"
14+ },
15+ "original": {
16+ "owner": "numtide",
17+ "repo": "flake-utils",
18+ "type": "github"
19+ }
20+ },
3 "glimmer": {21 "glimmer": {
4 "flake": false,22 "flake": false,
5 "locked": {23 "locked": {
@@ -51,6 +69,27 @@
51 "url": "https://github.com/jolt-lang/jolt"69 "url": "https://github.com/jolt-lang/jolt"
52 }70 }
53 },71 },
72+ "nixgl": {
73+ "inputs": {
74+ "flake-utils": "flake-utils",
75+ "nixpkgs": [
76+ "nixpkgs"
77+ ]
78+ },
79+ "locked": {
80+ "lastModified": 1762090880,
81+ "narHash": "sha256-fbRQzIGPkjZa83MowjbD2ALaJf9y6KMDdJBQMKFeY/8=",
82+ "owner": "nix-community",
83+ "repo": "nixGL",
84+ "rev": "b6105297e6f0cd041670c3e8628394d4ee247ed5",
85+ "type": "github"
86+ },
87+ "original": {
88+ "owner": "nix-community",
89+ "repo": "nixGL",
90+ "type": "github"
91+ }
92+ },
54 "nixpkgs": {93 "nixpkgs": {
55 "locked": {94 "locked": {
56 "lastModified": 1788039129,95 "lastModified": 1788039129,
@@ -72,8 +111,24 @@
72 "glimmer": "glimmer",111 "glimmer": "glimmer",
73 "jolt-native": "jolt-native",112 "jolt-native": "jolt-native",
74 "jolt-src": "jolt-src",113 "jolt-src": "jolt-src",
114+ "nixgl": "nixgl",
75 "nixpkgs": "nixpkgs"115 "nixpkgs": "nixpkgs"
76 }116 }
117+ },
118+ "systems": {
119+ "locked": {
120+ "lastModified": 1681028828,
121+ "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
122+ "owner": "nix-systems",
123+ "repo": "default",
124+ "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
125+ "type": "github"
126+ },
127+ "original": {
128+ "owner": "nix-systems",
129+ "repo": "default",
130+ "type": "github"
131+ }
77 }132 }
78 },133 },
79 "root": "root",134 "root": "root",
modified flake.nix +24 -5
@@ -13,9 +13,10 @@
1313 #
1414 # On a machine that is not NixOS the GL driver is the host's and the loader
1515 # will not find it, so the window never opens ("GL display: argument does not
16- # name a valid config"). Launch through nixGL there:
17- #
18- # nix run --impure "git+https://github.com/nix-community/nixGL#nixGLIntel" -- ./result/bin/frq
16+ # name a valid config"). The launcher handles that itself: off NixOS it hands
17+ # the process to nixGL, which puts the host's driver ahead of the store's.
18+ # Nothing extra to type, and a distrobox/container Arch is the same case as
19+ # a bare one.
1920 description = "frq — a freeq client in jolt";
2021
2122 inputs = {
@@ -38,9 +39,15 @@
3839 url = "git+https://gitlab.com/nandithebull/glimmer?rev=399df371c790d690fb6e4560c3d4d7f838502857";
3940 flake = false;
4041 };
42+
43+ # Only ever used off NixOS, to put the host GL driver on the loader path.
44+ nixgl = {
45+ url = "github:nix-community/nixGL";
46+ inputs.nixpkgs.follows = "nixpkgs";
47+ };
4148 };
4249
43- outputs = { self, nixpkgs, jolt-src, jolt-native, glimmer }:
50+ outputs = { self, nixpkgs, jolt-src, jolt-native, glimmer, nixgl }:
4451 let
4552 systems = [ "x86_64-linux" "aarch64-linux" ];
4653 forEachSystem = f:
@@ -51,6 +58,11 @@
5158 let
5259 inherit (pkgs) lib;
5360
61+ # Mesa, despite the name: it covers Intel and AMD alike. The NVIDIA
62+ # wrappers are the ones that need --impure (they read the host kernel
63+ # module's version), which is why this only ever reaches for Intel.
64+ nixGL = nixgl.packages.${pkgs.stdenv.hostPlatform.system}.nixGLIntel;
65+
5466 # libvidya (the retained-tree ABI glimmer-vidya binds, on egui) and
5567 # libjoltmoq (the AV media plane). One workspace, two cdylibs.
5668 native = pkgs.rustPlatform.buildRustPackage {
@@ -172,7 +184,14 @@
172184 frqScript = pkgs.writeShellScript "frq" ''
173185 export LD_LIBRARY_PATH="${native}/lib:${lib.makeLibraryPath runtimeLibs}''${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
174186 cd ${frqSource}
175- exec ${joltRuntime}/bin/jolt \
187+
188+ # On NixOS the store's Mesa is the system's and the window opens.
189+ # Anywhere else the real driver is the host's, so defer to nixGL —
190+ # it prepends the host driver, which has to win over ours.
191+ runner=""
192+ [ -e /run/current-system ] || runner="${nixGL}/bin/nixGLIntel"
193+
194+ exec ''${runner} ${joltRuntime}/bin/jolt \
176195 -Sdeps '{:deps {jolt-lang/glimmer {:local/root "${glimmer}"} nandi/glimmer-vidya {:local/root "${glimmerVidya}"}}}' \
177196 -M:frq "$@"
178197 '';
@@ -13,9 +13,10 @@
13 #13 #
14 # On a machine that is not NixOS the GL driver is the host's and the loader14 # On a machine that is not NixOS the GL driver is the host's and the loader
15 # will not find it, so the window never opens ("GL display: argument does not15 # will not find it, so the window never opens ("GL display: argument does not
16- # name a valid config"). Launch through nixGL there:16+ # name a valid config"). The launcher handles that itself: off NixOS it hands
17- #17+ # the process to nixGL, which puts the host's driver ahead of the store's.
18- # nix run --impure "git+https://github.com/nix-community/nixGL#nixGLIntel" -- ./result/bin/frq18+ # Nothing extra to type, and a distrobox/container Arch is the same case as
19+ # a bare one.
19 description = "frq — a freeq client in jolt";20 description = "frq — a freeq client in jolt";
20 21
21 inputs = {22 inputs = {
@@ -38,9 +39,15 @@
38 url = "git+https://gitlab.com/nandithebull/glimmer?rev=399df371c790d690fb6e4560c3d4d7f838502857";39 url = "git+https://gitlab.com/nandithebull/glimmer?rev=399df371c790d690fb6e4560c3d4d7f838502857";
39 flake = false;40 flake = false;
40 };41 };
42+
43+ # Only ever used off NixOS, to put the host GL driver on the loader path.
44+ nixgl = {
45+ url = "github:nix-community/nixGL";
46+ inputs.nixpkgs.follows = "nixpkgs";
47+ };
41 };48 };
42 49
43- outputs = { self, nixpkgs, jolt-src, jolt-native, glimmer }:50+ outputs = { self, nixpkgs, jolt-src, jolt-native, glimmer, nixgl }:
44 let51 let
45 systems = [ "x86_64-linux" "aarch64-linux" ];52 systems = [ "x86_64-linux" "aarch64-linux" ];
46 forEachSystem = f:53 forEachSystem = f:
@@ -51,6 +58,11 @@
51 let58 let
52 inherit (pkgs) lib;59 inherit (pkgs) lib;
53 60
61+ # Mesa, despite the name: it covers Intel and AMD alike. The NVIDIA
62+ # wrappers are the ones that need --impure (they read the host kernel
63+ # module's version), which is why this only ever reaches for Intel.
64+ nixGL = nixgl.packages.${pkgs.stdenv.hostPlatform.system}.nixGLIntel;
65+
54 # libvidya (the retained-tree ABI glimmer-vidya binds, on egui) and66 # libvidya (the retained-tree ABI glimmer-vidya binds, on egui) and
55 # libjoltmoq (the AV media plane). One workspace, two cdylibs.67 # libjoltmoq (the AV media plane). One workspace, two cdylibs.
56 native = pkgs.rustPlatform.buildRustPackage {68 native = pkgs.rustPlatform.buildRustPackage {
@@ -172,7 +184,14 @@
172 frqScript = pkgs.writeShellScript "frq" ''184 frqScript = pkgs.writeShellScript "frq" ''
173 export LD_LIBRARY_PATH="${native}/lib:${lib.makeLibraryPath runtimeLibs}''${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"185 export LD_LIBRARY_PATH="${native}/lib:${lib.makeLibraryPath runtimeLibs}''${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
174 cd ${frqSource}186 cd ${frqSource}
175- exec ${joltRuntime}/bin/jolt \187+
188+ # On NixOS the store's Mesa is the system's and the window opens.
189+ # Anywhere else the real driver is the host's, so defer to nixGL —
190+ # it prepends the host driver, which has to win over ours.
191+ runner=""
192+ [ -e /run/current-system ] || runner="${nixGL}/bin/nixGLIntel"
193+
194+ exec ''${runner} ${joltRuntime}/bin/jolt \
176 -Sdeps '{:deps {jolt-lang/glimmer {:local/root "${glimmer}"} nandi/glimmer-vidya {:local/root "${glimmerVidya}"}}}' \195 -Sdeps '{:deps {jolt-lang/glimmer {:local/root "${glimmer}"} nandi/glimmer-vidya {:local/root "${glimmerVidya}"}}}' \
177 -M:frq "$@"196 -M:frq "$@"
178 '';197 '';