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use crate::vk;
use crate::{Device, Instance};
use std::ffi::CStr;
use std::mem;

/// <https://www.khronos.org/registry/vulkan/specs/1.3-extensions/man/html/VK_EXT_image_compression_control.html>
#[derive(Clone)]
pub struct ImageCompressionControl {
    handle: vk::Device,
    fp: vk::ExtImageCompressionControlFn,
}

impl ImageCompressionControl {
    pub fn new(instance: &Instance, device: &Device) -> Self {
        let handle = device.handle();
        let fp = vk::ExtImageCompressionControlFn::load(|name| unsafe {
            mem::transmute(instance.get_device_proc_addr(handle, name.as_ptr()))
        });
        Self { handle, fp }
    }

    /// <https://www.khronos.org/registry/vulkan/specs/1.3-extensions/man/html/vkGetImageSubresourceLayout2EXT.html>
    #[inline]
    pub unsafe fn get_image_subresource_layout2(
        &self,
        image: vk::Image,
        subresource: &vk::ImageSubresource2EXT,
        layout: &mut vk::SubresourceLayout2EXT,
    ) {
        (self.fp.get_image_subresource_layout2_ext)(self.handle, image, subresource, layout)
    }

    #[inline]
    pub const fn name() -> &'static CStr {
        vk::ExtImageCompressionControlFn::name()
    }

    #[inline]
    pub fn fp(&self) -> &vk::ExtImageCompressionControlFn {
        &self.fp
    }

    #[inline]
    pub fn device(&self) -> vk::Device {
        self.handle
    }
}