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use crate::ffi::root::gli;
use crate::ffi::root::glm;
use crate::ffi::root::bindings::TextureCubeArray as bindings;

use crate::format::Format;
use crate::target::Target;
use crate::texture::{GliTexture, TextureCube};
use crate::texture::inner::TextureAccessible;
use crate::Extent2d;

/// Cube map array texture
#[repr(transparent)]
pub struct TextureCubeArray {
    ffi: gli::texture_cube_array,
}

impl TextureCubeArray {

    /// Create an empty texture cube array.
    #[inline]
    pub fn new_empty() -> TextureCubeArray {
        TextureCubeArray { ffi: unsafe { bindings::texcubearray_new_empty() } }
    }

    /// Create a texture_cube_array and allocate a new storage_linear.
    #[inline]
    pub fn new(format: Format, extent: Extent2d, layers: usize, levels: usize) -> TextureCubeArray {

        TextureCubeArray { ffi: unsafe { bindings::texcubearray_new_(format.0, glm::ivec2(extent.into()), layers, levels) } }
    }

    /// Create a texture_cube_array and allocate a new storage_linear with a complete mipmap chain.
    #[inline]
    pub fn new_with_mipmap_chain(format: Format, extent: Extent2d, layers: usize) -> TextureCubeArray {

        TextureCubeArray { ffi: unsafe { bindings::texcubearray_new_with_mipmap_chain(format.0, glm::ivec2(extent.into()), layers) } }
    }

    /// Create a texture_cube_array view with an existing storage_linear.
    #[inline]
    pub fn new_from(texture: &impl GliTexture) -> TextureCubeArray {
        TextureCubeArray { ffi: unsafe { bindings::texcubearray_share_from(texture.raw_texture()) } }
    }

    /// Create a texture_cube_array view with an existing storage_linear.
    #[inline]
    pub fn new_detail(texture: &impl GliTexture, format: Format, base_layer: usize, max_layer: usize, base_face: usize, max_face: usize, base_level: usize, max_level: usize) -> TextureCubeArray {

        TextureCubeArray {
            ffi: unsafe { bindings::texcubearray_share_from_detail(texture.raw_texture(), format.0, base_layer, max_layer, base_face, max_face, base_level, max_level) }
        }
    }

    /// Create a texture_cube_array view, reference a subset of an existing texture_cube_array instance.
    #[inline]
    pub fn new_from_subset(texture: &TextureCubeArray, base_layer: usize, max_layer: usize, base_face: usize, max_face: usize, base_level: usize, max_level: usize) -> TextureCubeArray {

        TextureCubeArray {
            ffi: unsafe { bindings::texcubearray_share_from_subset(&texture.ffi, base_layer, max_layer, base_face, max_face, base_level, max_level) }
        }
    }

    /// Create a view of the texture identified by Layer in the texture array.
    ///
    /// This method is equivalent to `[]` operator in C++ version.
    #[inline]
    pub fn get_layer(&self, layer: usize) -> TextureCube {

        debug_assert!(layer < self.layers());

        TextureCube::new_detail(
            self, self.format(),
            self.base_layer() + layer, self.base_level() + layer,
            self.base_face(), self.max_face(),
            self.base_level(), self.max_level())
    }

    #[doc(hidden)]
    #[inline]
    pub(crate) fn raw_ffi(&self) -> &gli::texture_cube_array {
        &self.ffi
    }
}

impl GliTexture for TextureCubeArray {
    const TARGET_TYPE: Target = Target::TARGET_CUBE_ARRAY;
    type ExtentType = Extent2d; // equivalent to gli::texture2d_extent_type.
}

impl TextureAccessible for TextureCubeArray {

    fn raw_texture(&self) -> &gli::texture {
        &self.ffi._base
    }

    fn raw_texture_mut(&mut self) -> &mut gli::texture {
        &mut self.ffi._base
    }
}

impl From<gli::texture> for TextureCubeArray {

    fn from(ffi: gli::texture) -> TextureCubeArray {
        TextureCubeArray { ffi: gli::texture_cube_array { _base: ffi } }
    }
}

impl std::cmp::PartialEq for TextureCubeArray {

    /// Compare two textures. Two textures are the same when the data, the format and the targets are the same.
    fn eq(&self, other: &TextureCubeArray) -> bool {

        use crate::ffi::root::bindings::Comparison::is_texture_equal;

        unsafe {
            is_texture_equal(self.raw_texture(), other.raw_texture())
        }
    }

    /// Compare two textures. Two textures are the same when the data, the format and the targets are the same.
    fn ne(&self, other: &TextureCubeArray) -> bool {

        use crate::ffi::root::bindings::Comparison::is_texture_unequal;

        unsafe {
            is_texture_unequal(self.raw_texture(), other.raw_texture())
        }
    }
}

impl std::cmp::Eq for TextureCubeArray {}