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//! A vertex and index buffer set for drawing
use super::staged::StagedBuffer;
use crate::{
context::RenderingContext,
mem::{MappableBlock, MemoryPool},
};
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;
/// A vertex and index buffer set for drawing
pub struct DrawBuffers<'a, T: Sized, P: MemoryPool, SP: MemoryPool> {
pub vertex_buffer: ManuallyDrop<StagedBuffer<'a, T, P, SP>>,
pub index_buffer: ManuallyDrop<StagedBuffer<'a, (u16, u16, u16), P, SP>>,
}
impl<'a, T, P, SP> DrawBuffers<'a, T, P, SP>
where
P: MemoryPool,
SP: MemoryPool,
SP::Block: MappableBlock,
{
/// Create a new set of drawbuffers given a render context.
/// This will allocate memory from `P` and `SP`, and currently has a fixed size (WIP).
pub fn from_context(context: &mut RenderingContext) -> Result<Self> {
let vert = StagedBuffer::from_context(context, Usage::VERTEX, INITIAL_VERT_SIZE)
.context("Error creating vertex buffer")?;
let index = StagedBuffer::from_context(context, Usage::INDEX, INITIAL_INDEX_SIZE)
.context("Error creating index buffer")?;
Ok(DrawBuffers {
vertex_buffer: ManuallyDrop::new(vert),
index_buffer: ManuallyDrop::new(index),
})
}
/// Destroy all Vulkan objects. Should be called before dropping.
pub fn deactivate(self, context: &mut RenderingContext) {
unsafe {
use core::ptr::read;
ManuallyDrop::into_inner(read(&self.vertex_buffer)).deactivate(context);
ManuallyDrop::into_inner(read(&self.index_buffer)).deactivate(context);
}
}
}
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