1 files changed, 66 insertions, 0 deletions
diff --git a/third_party/gbm/libgbm/mozgbm.cpp b/third_party/gbm/libgbm/mozgbm.cpp
new file mode 100644
index 0000000000..bc024a11c0
--- /dev/null
+++ b/third_party/gbm/libgbm/mozgbm.cpp
@@ -0,0 +1,66 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:expandtab:shiftwidth=4:tabstop=4:
+ */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Types.h"
+#include "prlink.h"
+
+#include <gbm/gbm.h>
+
+#define GET_FUNC(func, lib)                                  \
+    func##_fn =                                              \
+      (decltype(func##_fn))PR_FindFunctionSymbol(lib, #func) \
+
+#define IS_FUNC_LOADED(func)                                          \
+    (func != nullptr)                                                 \
+
+static struct gbm_device * (*gbm_create_device_fn)(int fd);
+static void (*gbm_device_destroy_fn)(struct gbm_device* gbm);
+
+bool IsGBMLibraryLoaded() {
+  static bool isLoaded =
+         (IS_FUNC_LOADED(gbm_create_device_fn) &&
+          IS_FUNC_LOADED(gbm_device_destroy_fn));
+
+  return isLoaded;
+}
+
+bool LoadGBMLibrary() {
+  static PRLibrary* gbmLib = nullptr;
+  static bool gbmInitialized = false;
+
+  //TODO Thread safe
+  if (!gbmInitialized) {
+    gbmInitialized = true;
+    gbmLib = PR_LoadLibrary("libgbm.so.1");
+    if (!gbmLib) {
+      return false;
+    }
+
+    GET_FUNC(gbm_create_device, gbmLib);
+    GET_FUNC(gbm_device_destroy, gbmLib);
+  }
+
+  return IsGBMLibraryLoaded();
+}
+
+struct gbm_device *
+gbm_create_device(int fd)
+{
+  if (!LoadGBMLibrary()) {
+    return nullptr;
+  }
+  return gbm_create_device_fn(fd);
+}
+
+void
+gbm_device_destroy(struct gbm_device* gbm)
+{
+  if (!LoadGBMLibrary()) {
+    return;
+  }
+  return gbm_device_destroy_fn(gbm);
+}