//
// Copyright (c) 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// DisplayGLX.h: GLX implementation of egl::Display

#ifndef LIBANGLE_RENDERER_GL_GLX_DISPLAYGLX_H_
#define LIBANGLE_RENDERER_GL_GLX_DISPLAYGLX_H_

#include <string>
#include <vector>

#include "libANGLE/renderer/gl/DisplayGL.h"
#include "libANGLE/renderer/gl/glx/FunctionsGLX.h"

namespace rx
{

class FunctionsGLX;

// State-tracking data for the swap control to allow DisplayGLX to remember per
// drawable information for swap control.
struct SwapControlData
{
    SwapControlData();

    // Set by the drawable
    int targetSwapInterval;

    // DisplayGLX-side state-tracking
    int maxSwapInterval;
    int currentSwapInterval;
};

class DisplayGLX : public DisplayGL
{
  public:
    DisplayGLX();
    ~DisplayGLX() override;

    egl::Error initialize(egl::Display *display) override;
    void terminate() override;

    SurfaceImpl *createWindowSurface(const egl::Config *configuration,
                                     EGLNativeWindowType window,
                                     const egl::AttributeMap &attribs) override;
    SurfaceImpl *createPbufferSurface(const egl::Config *configuration,
                                      const egl::AttributeMap &attribs) override;
    SurfaceImpl *createPbufferFromClientBuffer(const egl::Config *configuration,
                                               EGLClientBuffer shareHandle,
                                               const egl::AttributeMap &attribs) override;
    SurfaceImpl *createPixmapSurface(const egl::Config *configuration,
                                     NativePixmapType nativePixmap,
                                     const egl::AttributeMap &attribs) override;

    egl::ConfigSet generateConfigs() const override;

    bool isDeviceLost() const override;
    bool testDeviceLost() override;
    egl::Error restoreLostDevice() override;

    bool isValidNativeWindow(EGLNativeWindowType window) const override;

    egl::Error getDevice(DeviceImpl **device) override;

    std::string getVendorString() const override;

    egl::Error waitClient() const override;
    egl::Error waitNative(EGLint engine) const override;

    // Synchronizes with the X server, if the display has been opened by ANGLE.
    // Calling this is required at the end of every functions that does buffered
    // X calls (not for glX calls) otherwise there might be race conditions
    // between the application's display and ANGLE's one.
    void syncXCommands() const;

    // Depending on the supported GLX extension, swap interval can be set
    // globally or per drawable. This function will make sure the drawable's
    // swap interval is the one required so that the subsequent swapBuffers
    // acts as expected.
    void setSwapInterval(glx::Drawable drawable, SwapControlData *data);

    bool isValidWindowVisualId(unsigned long visualId) const;

  private:
    const FunctionsGL *getFunctionsGL() const override;

    glx::Context initializeContext(glx::FBConfig config, const egl::AttributeMap &eglAttributes);

    void generateExtensions(egl::DisplayExtensions *outExtensions) const override;
    void generateCaps(egl::Caps *outCaps) const override;

    int getGLXFBConfigAttrib(glx::FBConfig config, int attrib) const;
    glx::Context createContextAttribs(glx::FBConfig, const std::vector<int> &attribs) const;

    FunctionsGL *mFunctionsGL;

    //TODO(cwallez) yuck, change generateConfigs to be non-const or add a userdata member to egl::Config?
    mutable std::map<int, glx::FBConfig> configIdToGLXConfig;

    EGLint mRequestedVisual;
    glx::FBConfig mContextConfig;
    glx::Context mContext;
    // A pbuffer the context is current on during ANGLE initialization
    glx::Pbuffer mDummyPbuffer;

    bool mUsesNewXDisplay;
    bool mIsMesa;
    bool mHasMultisample;
    bool mHasARBCreateContext;

    enum class SwapControl
    {
        Absent,
        EXT,
        Mesa,
        SGI,
    };
    SwapControl mSwapControl;
    int mMinSwapInterval;
    int mMaxSwapInterval;
    int mCurrentSwapInterval;

    FunctionsGLX mGLX;
    egl::Display *mEGLDisplay;
};

}

#endif // LIBANGLE_RENDERER_GL_GLX_DISPLAYGLX_H_
