use memoffset::offset_of;
use ash::vk;

#[repr(C)]
#[derive(Clone, Debug, Copy)]
pub struct Particle {
    pos: [f32; 2],
    vel: [f32; 4],
    color: [f32; 4],
}

impl Particle {

}

#[repr(C)]
#[derive(Clone, Debug, Copy)]
pub struct Vertex {
    pos: [f32; 2],
    color: [f32; 3],
}

impl Vertex {
    pub fn get_binding_description() -> [vk::VertexInputBindingDescription; 1] {
        [vk::VertexInputBindingDescription {
            binding: 0,
            stride: std::mem::size_of::<Vertex>() as u32,
            input_rate: vk::VertexInputRate::VERTEX,
        }]
    }

    pub fn get_attribute_descriptions() -> [vk::VertexInputAttributeDescription; 2] {
        [
            vk::VertexInputAttributeDescription {
                binding: 0,
                location: 0,
                format: vk::Format::R32G32_SFLOAT,
                offset: offset_of!(Vertex, pos) as u32,
            },
            vk::VertexInputAttributeDescription {
                binding: 0,
                location: 1,
                format: vk::Format::R32G32B32_SFLOAT,
                offset: offset_of!(Vertex, color) as u32,
            },
        ]
    }
}

pub const TRI_VERT_DATA: [Vertex; 3] = [
    Vertex {
        pos: [0.0, -0.5],
        color: [1.0, 1.0, 1.0],
    },
    Vertex {
        pos: [0.5, 0.5],
        color: [0.0, 1.0, 0.0],
    },
    Vertex {
        pos: [-0.5, 0.5],
        color: [0.0, 0.0, 1.0],
    },
];