glfunc.hpp

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#pragma once
#ifndef OGLPLUS_GLFUNC_1201020903_HPP
#define OGLPLUS_GLFUNC_1201020903_HPP

#include <oglplus/config/compiler.hpp>
#include <oglplus/config/gl.hpp>

#if !OGLPLUS_NO_GLFUNC_CHECKS
#include <oglplus/error/glfunc.hpp>
#endif

namespace oglplus {

#if !OGLPLUS_NO_VARIADIC_TEMPLATES && !OGLPLUS_NO_GLFUNC_CHECKS
template <typename RV, typename ... Params>
inline auto _checked_glfunc(
    RV (GLAPIENTRY *pfn)(Params...),
    const char*
) -> decltype(pfn)
{
    return pfn;
}

template <typename RV, typename ... Params>
inline auto _checked_glfunc(
    RV (* GLAPIENTRY *ppfn)(Params...),
    const char* func_name
) -> decltype(*ppfn)
{
    OGLPLUS_HANDLE_ERROR_IF(
        (!ppfn || !*ppfn),
        GL_INVALID_OPERATION,
        MissingFunction::Message(),
        MissingFunction,
        GLFunc(func_name)
    );
    return *ppfn;
}

#ifndef OGLPLUS_GLFUNC
#define OGLPLUS_GLFUNC(FUNCNAME) \
    ::oglplus::_checked_glfunc(&::gl##FUNCNAME, #FUNCNAME)
#endif
#ifndef OGLPLUS_GLXFUNC
#define OGLPLUS_GLXFUNC(FUNCNAME) \
    ::oglplus::_checked_glfunc(&::glX##FUNCNAME, #FUNCNAME)
#endif
#ifndef OGLPLUS_WGLFUNC
#define OGLPLUS_WGLFUNC(FUNCNAME) \
    ::oglplus::_checked_glfunc(&::wgl##FUNCNAME, #FUNCNAME)
#endif

#else

#ifndef OGLPLUS_GLFUNC
#define OGLPLUS_GLFUNC(FUNCNAME) ::gl##FUNCNAME
#endif
#ifndef OGLPLUS_GLXFUNC
#define OGLPLUS_GLXFUNC(FUNCNAME) ::glX##FUNCNAME
#endif
#ifndef OGLPLUS_WGLFUNC
#define OGLPLUS_WGLFUNC(FUNCNAME) ::wgl##FUNCNAME
#endif

#endif


} // namespace oglplus

#endif // include guard