opengl error fixes

gl/buffer.cpp

@@ -39,6 +39,8 @@ void gl::buffer::bind_base(targets target, GLuint index)
 
 void gl::buffer::unbind(targets target)
 {
+    if( binding_points[ target ] == 0 ) { return; }
+
     glBindBuffer(glenum_target(target), 0);
     binding_points[target] = 0;
 }

gl/query.cpp

@@ -34,7 +34,8 @@ void gl::query::end()
 
 std::optional<int64_t> gl::query::result()
 {
-	GLuint ready;
+    end(); // intercept potential error if the result check is called for still active object
+    GLuint ready;
 	glGetQueryObjectuiv(*this, GL_QUERY_RESULT_AVAILABLE, &ready);
 	int64_t value = 0;
 	if (ready) {