[OpenGL] Import glXQueryDrawable just in case

src/gl/gl.h

@@ -16,6 +16,7 @@ void* glXGetCurrentContext();
 
 void* glXGetProcAddress(const unsigned char*);
 void* glXGetProcAddressARB(const unsigned char*);
+int glXQueryDrawable(void *dpy, void* glxdraw, int attr, unsigned int * value);
 
 unsigned int eglSwapBuffers( void*, void* );
 

src/loaders/loader_gl.cpp

@@ -86,6 +86,10 @@ bool gl_loader::Load(void *handle, bool egl_only) {
       reinterpret_cast<decltype(this->glXGetSwapIntervalMESA)>(
           glXGetProcAddress((const unsigned char *)"glXGetSwapIntervalMESA"));
 
+  glXQueryDrawable =
+      reinterpret_cast<decltype(this->glXQueryDrawable)>(
+          glXGetProcAddress((const unsigned char *)"glXQueryDrawable"));
+
   glXMakeCurrent =
       reinterpret_cast<decltype(this->glXMakeCurrent)>(
           glXGetProcAddress((const unsigned char *)"glXMakeCurrent"));
@@ -108,6 +112,7 @@ void gl_loader::CleanUp(bool unload) {
   glXSwapIntervalEXT = nullptr;
   glXSwapIntervalSGI = nullptr;
   glXSwapIntervalMESA = nullptr;
+  glXQueryDrawable = nullptr;
   glXMakeCurrent = nullptr;
 
 }

src/loaders/loader_gl.h

@@ -23,6 +23,7 @@ class gl_loader {
   decltype(&::glXGetSwapIntervalMESA) glXGetSwapIntervalMESA;
   decltype(&::glXMakeCurrent) glXMakeCurrent;
   decltype(&::glXGetCurrentContext) glXGetCurrentContext;
+  decltype(&::glXQueryDrawable) glXQueryDrawable;
 
   decltype(&::eglSwapBuffers) eglSwapBuffers;