use crate::primitive::UIRegion;
use wgpu::VertexAttribute;

#[repr(C)]
#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable)]
pub struct PrimitiveInstance {
    pub region: UIRegion,
    pub ptr: u32,
}

#[repr(C)]
#[derive(Copy, Clone, bytemuck::Pod, bytemuck::Zeroable, Default)]
pub struct WindowUniform {
    pub width: f32,
    pub height: f32,
}

impl PrimitiveInstance {
    const ATTRIBS: [VertexAttribute; 5] = wgpu::vertex_attr_array![
        0 => Float32x2,
        1 => Float32x2,
        2 => Float32x2,
        3 => Float32x2,
        4 => Uint32,
    ];

    pub fn desc() -> wgpu::VertexBufferLayout<'static> {
        wgpu::VertexBufferLayout {
            array_stride: std::mem::size_of::<Self>() as wgpu::BufferAddress,
            step_mode: wgpu::VertexStepMode::Instance,
            attributes: &Self::ATTRIBS,
        }
    }
}