GPUDisplayFrontendX11.h

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
 
#ifndef GPUDISPLAYFRONTENDX11_H
#define GPUDISPLAYFRONTENDX11_H
 
#include "GPUDisplayFrontend.h"
#include <X11/Xlib.h>
#include <GL/gl.h>
#include <GL/glx.h>
#include <GL/glxext.h>
 
namespace o2::gpu
{
class GPUDisplayFrontendX11 : public GPUDisplayFrontend
{
 public:
  GPUDisplayFrontendX11();
  ~GPUDisplayFrontendX11() override = default;
 
  void SwitchFullscreen(bool set) override;
  void ToggleMaximized(bool set) override;
  void SetVSync(bool enable) override;
  void OpenGLPrint(const char* s, float x, float y, float r, float g, float b, float a, bool fromBotton = true) override;
  void getSize(int32_t& width, int32_t& height) override;
  float getDisplayScale() const override { return mScale; }
  int32_t getVulkanSurface(void* instance, void* surface) override;
  uint32_t getReqVulkanExtensions(const char**& p) override;
 
 private:
  int32_t FrontendMain() override;
  int32_t GetKey(int32_t key);
  void GetKey(XEvent& event, int32_t& keyOut, int32_t& keyPressOut);
 
  GLuint mFontBase;
 
  Display* mXDisplay = nullptr;
  Window mWindow;
  void updateWindowState();
  float mScale = 1.f; // From the Xft.dpi X resource (desktop scaling, e.g. KDE with "Apply scaling themselves" for X11 apps)
 
  PFNGLXSWAPINTERVALEXTPROC mGlXSwapIntervalEXT = nullptr;
  bool vsync_supported = false;
  bool canSetVSync() override { return vsync_supported && mGlXSwapIntervalEXT; }
};
} // namespace o2::gpu
 
#endif