#include <psemek/gfx/texture.hpp>
#include <optional>

namespace psemek::gfx
{

	template struct basic_texture<1, gl::TEXTURE_1D>;
	template struct basic_texture<2, gl::TEXTURE_1D_ARRAY>;
	template struct basic_texture<2, gl::TEXTURE_2D>;
	template struct basic_texture<3, gl::TEXTURE_2D_ARRAY>;
	template struct basic_texture<3, gl::TEXTURE_3D>;

	template struct basic_texture<2, gl::TEXTURE_CUBE_MAP>;

	namespace detail
	{

		static std::optional<float> get_max_anisotropy()
		{
			if (!gl::exts::var_EXT_texture_filter_anisotropic) return std::nullopt;

			float level;
			gl::GetFloatv(gl::MAX_TEXTURE_MAX_ANISOTROPY_EXT, &level);
			return level;
		}

		std::optional<float> max_anisotropy()
		{
			static std::optional<float> level = get_max_anisotropy();

			return level;
		}

	}

	void texture_cubemap::load(int f, GLint internal_format, geom::vector<std::size_t, 2> const & size, GLenum format, GLenum type, const void * data)
	{
		bind();
		gl::TexImage2D(face_to_gl(f), 0, internal_format, size[0], size[1], 0, format, type, data);
		size_ = size;
	}

	void texture_cubemap::pixels(int f, GLenum format, GLenum type, void * data) const
	{
		bind();
		gl::GetTexImage(face_to_gl(f), 0, format, type, data);
	}

	GLenum texture_cubemap::face_to_gl(int f)
	{
		return gl::TEXTURE_CUBE_MAP_POSITIVE_X + f;
	}

}