use bytemuck::{Pod, Zeroable};
use galactica_constants::IMAGE_LIMIT;
use std::mem;
use wgpu;

#[repr(C)]
#[derive(Debug, Copy, Clone, Pod, Zeroable, Default)]
pub struct AtlasImageLocation {
	// Image box, in texture coordinates
	pub xpos: f32,
	pub ypos: f32,
	pub width: f32,
	pub height: f32,

	// The index of the texture this image is in
	pub atlas_texture: u32,

	pub _padding: [f32; 3],
}

#[derive(Debug, Copy, Clone)]
pub struct AtlasArray {
	pub data: [AtlasImageLocation; IMAGE_LIMIT as usize],
}

unsafe impl Pod for AtlasArray {}
unsafe impl Zeroable for AtlasArray {
	fn zeroed() -> Self {
		Self {
			data: [AtlasImageLocation::zeroed(); IMAGE_LIMIT as usize],
		}
	}
}

impl Default for AtlasArray {
	fn default() -> Self {
		Self::zeroed()
	}
}

impl AtlasArray {
	pub const SIZE: u64 = mem::size_of::<Self>() as wgpu::BufferAddress;
}