/// @brief Include to use 2d array textures.
/// @file gli/texture2d_array.hpp

#pragma once

#include "texture2d.hpp"

namespace gli {

    /// 2d array texture
    class texture2d_array : public texture {
    public:
        typedef extent2d extent_type;

    public:
        /// Create an empty texture 2D array
        texture2d_array();

        /// Create a texture2d_array and allocate a new storage_linear
        texture2d_array(
            format_type Format,
            extent_type const& Extent,
            size_type Layers,
            size_type Levels,
            swizzles_type const& Swizzles = swizzles_type(SWIZZLE_RED, SWIZZLE_GREEN, SWIZZLE_BLUE, SWIZZLE_ALPHA));

        /// Create a texture2d_array and allocate a new storage_linear with a complete mipmap chain
        texture2d_array(
            format_type Format,
            extent_type const& Extent,
            size_type Layers,
            swizzles_type const& Swizzles = swizzles_type(SWIZZLE_RED, SWIZZLE_GREEN, SWIZZLE_BLUE, SWIZZLE_ALPHA));

        /// Create a texture2d_array view with an existing storage_linear
        explicit texture2d_array(texture const& Texture);

        /// Create a texture2d_array view with an existing storage_linear
        texture2d_array(
            texture const& Texture,
            format_type Format,
            size_type BaseLayer, size_type MaxLayer,
            size_type BaseFace, size_type MaxFace,
            size_type BaseLevel, size_type MaxLevel,
            swizzles_type const& Swizzles = swizzles_type(SWIZZLE_RED, SWIZZLE_GREEN, SWIZZLE_BLUE, SWIZZLE_ALPHA));

        /// Create a texture view, reference a subset of an exiting texture2d_array instance
        texture2d_array(
            texture2d_array const& Texture,
            size_type BaseLayer, size_type MaxLayer,
            size_type BaseLevel, size_type MaxLevel);

        /// Create a view of the texture identified by Layer in the texture array
        texture2d operator[](size_type Layer) const;

        /// Return the dimensions of a texture instance: width and height
        extent_type extent(size_type Level = 0) const;

        /// Fetch a texel from a texture. The texture format must be uncompressed.
        template <typename gen_type>
        gen_type load(extent_type const& TexelCoord, size_type Layer, size_type Level) const;

        /// Write a texel to a texture. The texture format must be uncompressed.
        template <typename gen_type>
        void store(extent_type const& TexelCoord, size_type Layer, size_type Level, gen_type const& Texel);
    };
}//namespace gli


extern "C" {

    namespace bindings {

        namespace Texture2DArray {

            using gli::texture2d_array;

            texture2d_array tex2darray_new_empty() {
                return texture2d_array();
            }

            texture2d_array tex2darray_new_(texture2d_array::format_type format, texture2d_array::extent_type extent, texture2d_array::size_type layers, texture2d_array::size_type levels) {
                return texture2d_array(format, extent, layers, levels);
            }

            texture2d_array tex2darray_new_with_mipmap_chain(texture2d_array::format_type format, texture2d_array::extent_type extent, texture2d_array::size_type layers) {
                return texture2d_array(format, extent, layers);
            }

            texture2d_array tex2darray_share_from(const gli::texture & tex) {
                return texture2d_array(tex);
            }

            texture2d_array tex2darray_share_from_detail(
                const gli::texture & tex,
                texture2d_array::format_type format,
                texture2d_array::size_type base_layer, texture2d_array::size_type max_layer,
                texture2d_array::size_type base_face,  texture2d_array::size_type  max_face,
                texture2d_array::size_type base_level, texture2d_array::size_type max_level) {

                return texture2d_array(tex, format, base_layer, max_layer, base_face, max_face, base_level, max_level);
            }

            texture2d_array tex2darray_share_from_subset(
                const texture2d_array & tex,
                texture2d_array::size_type base_layer, texture2d_array::size_type max_layer,
                texture2d_array::size_type base_level, texture2d_array::size_type max_level) {

                return texture2d_array(tex, base_layer, max_layer, base_level, max_level);
            }

            texture2d_array::extent_type tex2darray_extent(const texture2d_array & tex, texture2d_array::size_type level = 0) {
                return tex.extent(level);
            }
        }
    }
}

#ifdef GLI_IMPLEMENTATION
#include "texture2d_array.inl"
#endif