GHOST/Wayland: support dynamic loading libraries for Wayland

Add intern/wayland_dynload which is used when WITH_GHOST_WAYLAND_DYNLOAD
is enabled (off by default). When enabled, systems without Wayland
installed will fall back to X11.

This allows Blender to dynamically load:
- libwayland-client
- libwayland-cursor
- libwayland-egl
- libdecor-0 (when WITH_GHOST_WAYLAND_LIBDECOR is enabled).

1 files changed, 40 insertions, 0 deletions

diff --git a/intern/wayland_dynload/intern/wayland_dynload_utils.c b/intern/wayland_dynload/intern/wayland_dynload_utils.c
new file mode 100644
index 00000000000..743dac14eec
--- /dev/null
+++ b/intern/wayland_dynload/intern/wayland_dynload_utils.c
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+/** \file
+ * \ingroup intern_wayland_dynload
+ */
+
+#include <stdio.h>
+
+#include "wayland_dynload_utils.h"
+
+DynamicLibrary dynamic_library_open_array_with_error(const char **paths,
+                                                     const int paths_num,
+                                                     const bool verbose,
+                                                     int *r_path_index)
+{
+  DynamicLibrary lib = NULL;
+  for (int a = 0; a < paths_num; a++) {
+    lib = dynamic_library_open(paths[a]);
+    if (lib) {
+      *r_path_index = a;
+      break;
+    }
+  }
+  if (lib == NULL) {
+    /* Use the last path as it's likely to be least specific. */
+    if (verbose) {
+      fprintf(stderr, "Unable to find '%s'\n", paths[paths_num - 1]);
+    }
+  }
+  return lib;
+}
+
+void *dynamic_library_find_with_error(DynamicLibrary lib, const char *symbol, const char *path_lib)
+{
+  void *symbol_var = dynamic_library_find(lib, symbol);
+  if (symbol_var == NULL) {
+    fprintf(stderr, "Unable to find '%s' in '%s'.\n", symbol, path_lib);
+  }
+  return symbol_var;
+}