Pala runClient: LD_LIBRARY_PATH GL + copie jar, SDL wayland

mods/pala/build.gradle

@@ -122,6 +122,31 @@ tasks.register('runClient', JavaExec) {
     description = 'Lance le client Minecraft avec le mod (dev visuel).'
     doFirst {
         layout.buildDirectory.dir('runClient/game/mods').get().asFile.mkdirs()
+        copy {
+            from(tasks.named('jar'))
+            into(layout.buildDirectory.dir('runClient/game/mods'))
+        }
+    }
+    // NixOS : dlopen ne voit ni libGL ni libvulkan sans LD_LIBRARY_PATH (cf launcher).
+    def nixStore = new File('/nix/store')
+    def glDirs = []
+    ['/run/opengl-driver/lib', '/run/current-system/sw/lib'].each { d ->
+        if (new File(d).exists()) glDirs << d
+    }
+    if (nixStore.exists()) {
+        nixStore.eachDir { e ->
+            def n = e.name
+            if (n.contains('libglvnd') || n.contains('vulkan-loader') || n.contains('alsa-lib')
+                || n.contains('pulseaudio') || (n.contains('pipewire') && !n.contains('python'))) {
+                def lib = new File(e, 'lib')
+                if (lib.exists()) glDirs << lib.absolutePath
+            }
+        }
+    }
+    def prevLd = System.getenv('LD_LIBRARY_PATH')
+    environment('LD_LIBRARY_PATH', (prevLd ? prevLd + ':' : '') + glDirs.join(':'))
+    if (!System.getenv('SDL_VIDEODRIVER') && (System.getenv('WAYLAND_DISPLAY') || new File('/run/user/1000/wayland-1').exists())) {
+        environment('SDL_VIDEODRIVER', 'wayland')
     }
     javaLauncher = javaToolchains.launcherFor { languageVersion = JavaLanguageVersion.of(25) }
     def mcVersion = project.minecraft_version