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//! A vertex and index buffer set for drawing
use super::StagedBuffer;
use crate::types::*;
use anyhow::{Context, Result};
use hal::buffer::Usage;
use std::mem::ManuallyDrop;
/// Initial size of vertex buffer. TODO: Way of overriding this
pub const INITIAL_VERT_SIZE: u64 = 3 * 3000;
/// Initial size of index buffer. TODO: Way of overriding this
pub const INITIAL_INDEX_SIZE: u64 = 3000;
/// The buffers used for drawing, ie index and vertex buffer
pub struct DrawBuffers<'a, T: Sized> {
pub vertex_buffer: ManuallyDrop<StagedBuffer<'a, T>>,
pub index_buffer: ManuallyDrop<StagedBuffer<'a, (u16, u16, u16)>>,
}
impl<'a, T> DrawBuffers<'a, T> {
pub fn new(device: &mut DeviceT, adapter: &Adapter) -> Result<DrawBuffers<'a, T>> {
let vert = StagedBuffer::new(device, adapter, Usage::VERTEX, INITIAL_VERT_SIZE)
.context("Error creating vertex buffer")?;
let index = StagedBuffer::new(device, adapter, Usage::INDEX, INITIAL_INDEX_SIZE)
.context("Error creating index buffer")?;
Ok(DrawBuffers {
vertex_buffer: ManuallyDrop::new(vert),
index_buffer: ManuallyDrop::new(index),
})
}
pub fn deactivate(self, device: &mut DeviceT) {
unsafe {
use core::ptr::read;
ManuallyDrop::into_inner(read(&self.vertex_buffer)).deactivate(device);
ManuallyDrop::into_inner(read(&self.index_buffer)).deactivate(device);
}
}
}
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