/// @brief Include to use cube map textures.
/// @file gli/texture_cube.hpp

#pragma once

#include "texture2d.hpp"

namespace gli {
    /// Cube map texture
    class texture_cube : public texture {
    public:
        typedef extent2d extent_type;

    public:
        /// Create an empty texture cube
        texture_cube();

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

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

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

        /// Create a texture_cube view with an existing storage_linear
        texture_cube(
            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_cube view, reference a subset of an existing texture_cube instance
        texture_cube(
            texture_cube const& Texture,
            size_type BaseFace, size_type MaxFace,
            size_type BaseLevel, size_type MaxLevel);

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

        /// Return the dimensions of a texture instance: width and height where both should be equal.
        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 Face, 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 Face, size_type Level, gen_type const& Texel);
    };
}//namespace gli



extern "C" {

namespace bindings {

    namespace TextureCube {

        using gli::texture_cube;

        texture_cube texcube_new_empty() {
            return texture_cube();
        }

        texture_cube texcube_new_(texture_cube::format_type format, texture_cube::extent_type extent, texture_cube::size_type levels) {
            return texture_cube(format, extent, levels);
        }

        texture_cube texcube_new_with_mipmap_chain(texture_cube::format_type format, texture_cube::extent_type extent) {
            return texture_cube(format, extent);
        }

        texture_cube texcube_share_from(const gli::texture & tex) {
            return texture_cube(tex);
        }

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

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

        texture_cube texcube_share_from_subset(
            const texture_cube & tex,
            texture_cube::size_type base_face, texture_cube::size_type max_face,
            texture_cube::size_type base_level, texture_cube::size_type max_level) {

            return texture_cube(tex, base_face, max_face, base_level, max_level);
        }

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

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