1 files changed, 39 insertions, 0 deletions
diff --git a/video/out/opengl/angle_dynamic.c b/video/out/opengl/angle_dynamic.c
new file mode 100644
index 0000000..2483828
--- /dev/null
+++ b/video/out/opengl/angle_dynamic.c
@@ -0,0 +1,39 @@
+#include <windows.h>
+
+#include "angle_dynamic.h"
+
+#include "common/common.h"
+#include "osdep/threads.h"
+
+#if HAVE_EGL_ANGLE_LIB
+bool angle_load(void)
+{
+    return true;
+}
+#else
+#define ANGLE_DECL(NAME, VAR) \
+    VAR;
+ANGLE_FNS(ANGLE_DECL)
+
+static bool angle_loaded;
+static mp_once angle_load_once = MP_STATIC_ONCE_INITIALIZER;
+
+static void angle_do_load(void)
+{
+    // Note: we let this handle "leak", as the functions remain valid forever.
+    HANDLE angle_dll = LoadLibraryW(L"LIBEGL.DLL");
+    if (!angle_dll)
+        return;
+#define ANGLE_LOAD_ENTRY(NAME, VAR) \
+    NAME = (void *)GetProcAddress(angle_dll, #NAME); \
+    if (!NAME) return;
+    ANGLE_FNS(ANGLE_LOAD_ENTRY)
+    angle_loaded = true;
+}
+
+bool angle_load(void)
+{
+    mp_exec_once(&angle_load_once, angle_do_load);
+    return angle_loaded;
+}
+#endif