Allow applications to specify the Vulkan library path

I don't know if vendoring the Vulkan library is appropriate, but regardless,
this allows applications to set the name to whatever they want, or specify an
absolute path, just in case the standard value baked into Pugl isn't the right
one in some situation.

3 files changed, 13 insertions, 7 deletions

diff --git a/src/mac_vulkan.m b/src/mac_vulkan.m
index 2362db1..45c4839 100644
--- a/src/mac_vulkan.m
+++ b/src/mac_vulkan.m
@@ -107,7 +107,8 @@ struct PuglVulkanLoaderImpl {
 };
 
 PuglVulkanLoader*
-puglNewVulkanLoader(PuglWorld* PUGL_UNUSED(world))
+puglNewVulkanLoader(PuglWorld*        PUGL_UNUSED(world),
+                    const char* const libraryName)
 {
   PuglVulkanLoader* loader =
     (PuglVulkanLoader*)calloc(1, sizeof(PuglVulkanLoader));
@@ -115,7 +116,8 @@ puglNewVulkanLoader(PuglWorld* PUGL_UNUSED(world))
     return NULL;
   }
 
-  if (!(loader->libvulkan = dlopen("libvulkan.dylib", RTLD_LAZY))) {
+  const char* const filename = libraryName ? libraryName : "libvulkan.dylib";
+  if (!(loader->libvulkan = dlopen(filename, RTLD_LAZY))) {
     free(loader);
     return NULL;
   }
diff --git a/src/win_vulkan.c b/src/win_vulkan.c
index ddd3fbe..4a4d005 100644
--- a/src/win_vulkan.c
+++ b/src/win_vulkan.c
@@ -21,7 +21,8 @@ struct PuglVulkanLoaderImpl {
 };
 
 PuglVulkanLoader*
-puglNewVulkanLoader(PuglWorld* PUGL_UNUSED(world))
+puglNewVulkanLoader(PuglWorld*        PUGL_UNUSED(world),
+                    const char* const libraryName)
 {
   PuglVulkanLoader* loader =
     (PuglVulkanLoader*)calloc(1, sizeof(PuglVulkanLoader));
@@ -29,8 +30,9 @@ puglNewVulkanLoader(PuglWorld* PUGL_UNUSED(world))
     return NULL;
   }
 
-  const DWORD flags = LOAD_LIBRARY_SEARCH_DEFAULT_DIRS;
-  if (!(loader->libvulkan = LoadLibraryEx("vulkan-1.dll", NULL, flags))) {
+  const DWORD       flags    = LOAD_LIBRARY_SEARCH_DEFAULT_DIRS;
+  const char* const filename = libraryName ? libraryName : "vulkan-1.dll";
+  if (!(loader->libvulkan = LoadLibraryEx(filename, NULL, flags))) {
     free(loader);
     return NULL;
   }
diff --git a/src/x11_vulkan.c b/src/x11_vulkan.c
index 54b1218..834ac37 100644
--- a/src/x11_vulkan.c
+++ b/src/x11_vulkan.c
@@ -26,9 +26,11 @@ struct PuglVulkanLoaderImpl {
 };
 
 PuglVulkanLoader*
-puglNewVulkanLoader(PuglWorld* PUGL_UNUSED(world))
+puglNewVulkanLoader(PuglWorld*        PUGL_UNUSED(world),
+                    const char* const libraryName)
 {
-  void* const libvulkan = dlopen("libvulkan.so", RTLD_LAZY);
+  const char* const filename  = libraryName ? libraryName : "libvulkan.so";
+  void* const       libvulkan = dlopen(filename, RTLD_LAZY);
   if (!libvulkan) {
     return NULL;
   }