use safer_ffi::derive_ReprC;
use vulkan_rs::prelude::*;

use std::mem;

#[derive_ReprC]
#[repr(C)]
#[derive(Copy, Clone, Debug)]
pub struct TexturedVertex {
    pub position: cgmath::Vector4<f32>,
    pub texture_coordinates: cgmath::Vector2<f32>,
}

impl VertexInputDescription for TexturedVertex {
    fn bindings() -> Vec<VkVertexInputBindingDescription> {
        vec![VkVertexInputBindingDescription {
            binding: 0,
            stride: mem::size_of::<TexturedVertex>() as u32,
            inputRate: VK_VERTEX_INPUT_RATE_VERTEX,
        }]
    }

    fn attributes() -> Vec<VkVertexInputAttributeDescription> {
        vec![
            VkVertexInputAttributeDescription {
                location: 0,
                binding: 0,
                format: VK_FORMAT_R32G32B32A32_SFLOAT,
                offset: 0,
            },
            VkVertexInputAttributeDescription {
                location: 1,
                binding: 0,
                format: VK_FORMAT_R32G32_SFLOAT,
                offset: 16, // mem::size_of::<cgmath::Vector4<f32>>() as u32
            },
        ]
    }
}

impl Default for TexturedVertex {
    fn default() -> TexturedVertex {
        TexturedVertex {
            position: cgmath::Vector4::zero(),
            texture_coordinates: cgmath::Vector2::zero(),
        }
    }
}