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use std::num::NonZeroU64;

use crate::binding::Bind;

/// A uniform buffer that can be bound in a 'BindingGroup'.
#[derive(Debug)]
pub struct UniformBuffer {
    pub wgpu: wgpu::Buffer,
    pub size: usize,
    pub count: usize,
}

impl Bind for UniformBuffer {
    fn binding(&self, index: u32) -> wgpu::BindGroupEntry {
        wgpu::BindGroupEntry {
            binding: index as u32,
            resource: wgpu::BindingResource::Buffer(wgpu::BufferBinding {
                buffer: &self.wgpu,
                offset: 0,
                size: NonZeroU64::new((self.size * self.count) as u64),
            }),
        }
    }
}