use bytemuck::{Pod, Zeroable};
use galactica_util::constants::OBJECT_SPRITE_INSTANCE_LIMIT;
use std::mem;
use wgpu;

#[repr(C)]
#[derive(Debug, Copy, Clone, Pod, Zeroable, Default)]
pub struct ObjectData {
	pub xpos: f32,
	pub ypos: f32,
	pub zpos: f32,
	pub angle: f32,
	pub size: f32,

	/// Index of parent object
	pub parent: u32,

	/// 1 if has parent, 0 if not
	pub is_child: u32,

	pub _padding: [f32; 1],
}

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

#[derive(Debug, Copy, Clone)]
pub struct ObjectLocationArray {
	pub data: [ObjectData; OBJECT_SPRITE_INSTANCE_LIMIT as usize],
}

unsafe impl Pod for ObjectLocationArray {}
unsafe impl Zeroable for ObjectLocationArray {
	fn zeroed() -> Self {
		Self {
			data: [ObjectData::zeroed(); OBJECT_SPRITE_INSTANCE_LIMIT as usize],
		}
	}
}

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

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