easy-gl › ScopedBind

ScopedBind

A RAII helper that calls a bind function on construction and an unbind function on destruction. Useful for ensuring a resource is unbound when leaving a scope, even on exceptions.

ScopedBind is non-copyable and non-movable. It is templated on the bind and unbind callable types so there is no virtual dispatch overhead.

Usage with a Framebuffer

// Bind the FBO for the duration of this block, then unbind automatically:
{
    easygl::ScopedBind fboBind(
        [&]{ fbo.bind(); },
        []{ easygl::Framebuffer::unbind(); }
    );

    // Render to fbo here ...
    device.draw_arrays(easygl::PrimitiveType::Triangles, 0, 3);

} // FBO is unbound here, even if an exception was thrown above

Usage with a VAO

{
    easygl::ScopedBind vaoBind(
        [&]{ vao.bind(); },
        [&]{ vao.unbind(); }
    );

    // Modify vertex attribute state ...
    vao.set_attribute_pointer(0, 3, easygl::DataType::Float, false, 0, nullptr);
    vao.enable_attribute(0);
}

Constructor