Created flake and added license.txt
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.envrc
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.direnv/
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build/
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Copyright (c) 2026 Bellsworne LLC.
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Generated
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{
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"nodes": {
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"nixpkgs": {
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"locked": {
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"lastModified": 1793341285,
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"narHash": "sha256-Y1CiZ4SoBUjLQyQM/pY+rS2dXD3CHLPstF0lmOc73D4=",
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"owner": "NixOS",
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"repo": "nixpkgs",
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"rev": "1c89083e451e891152365b799595cf7790a43325",
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"type": "github"
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},
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"original": {
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"owner": "NixOS",
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"ref": "nixos-unstable",
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"repo": "nixpkgs",
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"type": "github"
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}
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},
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"odin-src": {
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"flake": false,
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"locked": {
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"lastModified": 1791295716,
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"narHash": "sha256-Y8Em52W3ntWXgnRiRAyhWv5Y6+3b/4bj2+TTIvtniYU=",
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"owner": "odin-lang",
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"repo": "Odin",
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"rev": "84bc3fc2100b0f7880a3af37f71bccdcda41c6f9",
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"type": "github"
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},
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"original": {
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"owner": "odin-lang",
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"ref": "dev-2026-10",
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"repo": "Odin",
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"type": "github"
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}
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},
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"ols-src": {
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"flake": false,
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"locked": {
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"lastModified": 1791685123,
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"narHash": "sha256-tVg9g5aN4ovUElpDzTSLpTQUq3OEiYUaq3YO98ex8wA=",
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"owner": "DanielGavin",
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"repo": "ols",
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"rev": "c96dea912cf8272da7bb01a68696af5dfe1269ca",
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"type": "github"
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},
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"original": {
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"owner": "DanielGavin",
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"ref": "dev-2026-10",
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"repo": "ols",
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"type": "github"
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}
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},
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"root": {
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"inputs": {
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"nixpkgs": "nixpkgs",
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"odin-src": "odin-src",
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"ols-src": "ols-src"
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}
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}
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},
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"root": "root",
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"version": 7
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}
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{
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description = "Regolith, a retained mode GUI library for Odin";
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
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# Pinned to the latest monthly release tag
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# If you change this, also change odinVersion below
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odin-src = {
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url = "github:odin-lang/Odin/dev-2026-10";
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flake = false;
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};
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# OLS must match the Odin revision
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ols-src = {
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url = "github:DanielGavin/ols/dev-2026-10";
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flake = false;
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};
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};
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outputs = { self, nixpkgs, odin-src, ols-src }:
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let
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lib = nixpkgs.lib;
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systems = [ "x86_64-linux" "aarch64-linux" ];
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forAllSystems = f:
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lib.genAttrs systems (system: f nixpkgs.legacyPackages.${system});
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odinVersion = "2026-10";
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build = pkgs:
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let
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llvmPackages = pkgs.llvmPackages_20;
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odin = llvmPackages.stdenv.mkDerivation {
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pname = "odin";
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version = "dev-${odinVersion}";
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src = odin-src;
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nativeBuildInputs = [ pkgs.makeBinaryWrapper pkgs.which ];
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buildInputs = [ llvmPackages.llvm ];
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LLVM_CONFIG = "${llvmPackages.llvm.dev}/bin/llvm-config";
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# The build script stamps the version from the build date, which is
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# meaningless inside the Nix sandbox. Stamp the tag instead.
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postPatch = ''
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substituteInPlace build_odin.sh \
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--replace-fail '$(date +"%Y-%m")' '${odinVersion}'
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patchShebangs build_odin.sh
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'';
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dontConfigure = true;
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buildPhase = ''
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runHook preBuild
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./build_odin.sh release
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runHook postBuild
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'';
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installPhase = ''
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runHook preInstall
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mkdir -p $out/bin $out/share
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cp odin $out/bin/odin
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for d in base core vendor shared; do
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if [ -d "$d" ]; then cp -r "$d" $out/share/; fi
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done
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wrapProgram $out/bin/odin \
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--prefix PATH : ${lib.makeBinPath [
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llvmPackages.bintools
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llvmPackages.clang
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llvmPackages.lld
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]} \
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--set-default ODIN_ROOT $out/share
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# Build the C parts of the vendor collection.
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for v in stb cgltf miniaudio; do
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d="$out/share/vendor/$v/src"
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[ -d "$d" ] || continue
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if [ -f "$d/Makefile" ] || [ -f "$d/makefile" ] || [ -f "$d/GNUmakefile" ]; then
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make -C "$d"
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elif [ -f "$d/build_$v.sh" ]; then
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patchShebangs "$d/build_$v.sh"
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(cd "$d" && "./build_$v.sh") || echo "vendor/$v: build script failed, skipping"
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else
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echo "vendor/$v/src: no known build entry point, skipping"
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fi
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done
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runHook postInstall
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'';
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};
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ols = pkgs.stdenv.mkDerivation {
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pname = "ols";
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version = "dev-${odinVersion}";
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src = ols-src;
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nativeBuildInputs = [ odin ];
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dontConfigure = true;
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postPatch = ''
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patchShebangs build.sh odinfmt.sh
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'';
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buildPhase = ''
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runHook preBuild
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./build.sh
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./odinfmt.sh
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runHook postBuild
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'';
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installPhase = ''
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runHook preInstall
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install -Dm755 ols $out/bin/ols
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install -Dm755 odinfmt $out/bin/odinfmt
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runHook postInstall
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'';
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};
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in
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{ inherit odin ols llvmPackages; };
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in
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{
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packages = forAllSystems (pkgs:
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let p = build pkgs; in {
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inherit (p) odin ols;
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default = p.odin;
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});
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devShells = forAllSystems (pkgs:
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let
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p = build pkgs;
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llvmPackages = p.llvmPackages;
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runtimeLibs = with pkgs; [
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sdl3
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wayland
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libxkbcommon
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libdecor
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vulkan-loader
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libGL
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];
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in
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{
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default = (pkgs.mkShell.override { stdenv = llvmPackages.stdenv; }) {
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name = "regolith";
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packages = [
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# Odin toolchain
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p.odin
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p.ols
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llvmPackages.lld
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llvmPackages.bintools
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# Native build and runtime
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pkgs.pkg-config
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pkgs.sdl3
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# WASM
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pkgs.emscripten
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pkgs.nodejs
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pkgs.python3
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# Lua tooling (the engine builds its own vendored Lua)
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pkgs.lua5_4
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pkgs.lua54Packages.luacheck
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# Debugging
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pkgs.gdb
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pkgs.valgrind
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pkgs.git
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];
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shellHook = ''
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# Emscripten needs a writable cache, and the store is read only.
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export EM_CACHE="$PWD/.cache/emscripten"
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mkdir -p "$EM_CACHE"
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# SDL3 dlopens these at runtime. nixpkgs SDL3 is patched to find
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# most of them, this is a fallback for anything built outside Nix.
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export LD_LIBRARY_PATH="${lib.makeLibraryPath runtimeLibs}:/run/opengl-driver/lib:''${LD_LIBRARY_PATH:-}"
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'';
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};
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});
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};
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}
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