#include <psemek/gfx/buffer.hpp>

namespace psemek::gfx
{

	buffer::buffer()
	{
		gl::GenBuffers(1, &id_);
	}

	buffer::buffer(buffer && other)
		: id_{other.id_}
	{
		other.id_ = 0;
	}

	buffer & buffer::operator = (buffer && other)
	{
		if (this == &other) return *this;

		reset();
		std::swap(id_, other.id_);
		return *this;
	}

	buffer::~buffer()
	{
		reset();
	}

	buffer buffer::null()
	{
		return buffer(nullptr);
	}

	void buffer::bind() const
	{
		gl::BindBuffer(gl::ARRAY_BUFFER, id_);
	}

	void buffer::reset()
	{
		if (id_ != 0)
			gl::DeleteBuffers(1, &id_);
		id_ = 0;
	}

	void buffer::load(void const * data, std::size_t size, GLenum usage)
	{
		bind();
		gl::BufferData(gl::ARRAY_BUFFER, size, data, usage);
	}

	buffer::buffer(std::nullptr_t)
		: id_{0}
	{}

}