src/dawn_native/XlibXcbFunctions.h

// Copyright 2021 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef DAWNNATIVE_XLIBXCBFUNCTIONS_H_
#define DAWNNATIVE_XLIBXCBFUNCTIONS_H_

#include "common/DynamicLib.h"
#include "dawn_native/Error.h"

#include "common/xlib_with_undefs.h"

class DynamicLib;

namespace dawn_native {

    // A helper class that dynamically loads the x11-xcb library that contains XGetXCBConnection
    // (and nothing else). This has to be dynamic because this libraries isn't present on all Linux
    // deployment platforms that Chromium targets.
    class XlibXcbFunctions {
      public:
        XlibXcbFunctions();
        ~XlibXcbFunctions();

        bool IsLoaded() const;

        // Functions from x11-xcb
        decltype(&::XGetXCBConnection) xGetXCBConnection = nullptr;

      private:
        DynamicLib mLib;
    };

}  // namespace dawn_native

#endif  // DAWNNATIVE_XLIBXCBFUNCTIONS_H_