surface_glx.hpp

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#pragma once
#ifndef OGLPLUS_NATIVE_SURFACE_1404232057_HPP
#define OGLPLUS_NATIVE_SURFACE_1404232057_HPP
// NOTE: the include guard is intentionally without the _GLX suffix so that
// different native surface implementation cannot be included simultaneously.

#define OGLPLUS_NATIVE_GLX 1

#include <oglplus/native/common_glx.hpp>
#include <GL/glx.h>

namespace oglplus {
namespace native {

class SurfaceGLX
{
private:
    ::Display* _display;
    ::GLXDrawable  _drawable;

    friend class ContextGLX;

    struct Current_ { };

    SurfaceGLX(Current_)
     : _display(::glXGetCurrentDisplay())
     , _drawable(::glXGetCurrentDrawable())
    {
        if(!_display) HandleNoGLXDisplay();
        if(!_drawable) HandleNoGLXDrawable();
    }

    unsigned _query(int param) const
    {
        unsigned result = 0;
        ::glXQueryDrawable(
            _display,
            _drawable,
            param,
            &result
        );
        return result;
    }
public:

    static SurfaceGLX Current(void)
    {
        return SurfaceGLX(Current_());
    }

    int Width(void) const
    {
        return int(_query(GLX_WIDTH));
    }

    int Height(void) const
    {
        return int(_query(GLX_HEIGHT));
    }

    void SwapBuffers(void)
    {
        ::glXSwapBuffers(_display, _drawable);
    }
};

typedef SurfaceGLX Surface;

} // namespace native
} // namespace oglplus

#endif // include guard