surface_wgl.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 _WGL suffix so that
// different native surface implementation cannot be included simultaneously.

#define OGLPLUS_NATIVE_WGL 1

#include <oglplus/native/common_wgl.hpp>
#include <Windows.h>

namespace oglplus {
namespace native {

class SurfaceWGL
{
private:
    ::HDC _hdc;

    friend class ContextWGL;

    struct Current_ { };

    SurfaceWGL(Current_)
     : _hdc(::wglGetCurrentDC())
    {
        if(!_hdc) HandleNoWGLDC();
    }
public:

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

    int Width(void) const
    {
        ::RECT rect;
        if(::GetClientRect(::WindowFromDC(_hdc), &rect) == TRUE)
        {
            return rect.right - rect.left;
        }
        return 0;
    }

    int Height(void) const
    {
        ::RECT rect;
        if(::GetClientRect(::WindowFromDC(_hdc), &rect) == TRUE)
        {
            return rect.bottom - rect.top;
        }
        return 0;
    }

    void SwapBuffers(void)
    {
        ::SwapBuffers(_hdc);
    }
};

typedef SurfaceWGL Surface;

} // namespace native
} // namespace oglplus

#endif // include guard