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uniform_vec.rs
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uniform_vec.rs
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use crate::{
render_resource::Buffer,
renderer::{RenderDevice, RenderQueue},
};
use crevice::std140::{self, AsStd140, DynamicUniform, Std140};
use std::num::NonZeroU64;
use wgpu::{BindingResource, BufferBinding, BufferDescriptor, BufferUsage};
pub struct UniformVec<T: AsStd140> {
values: Vec<T>,
scratch: Vec<u8>,
uniform_buffer: Option<Buffer>,
capacity: usize,
item_size: usize,
}
impl<T: AsStd140> Default for UniformVec<T> {
fn default() -> Self {
Self {
values: Vec::new(),
scratch: Vec::new(),
uniform_buffer: None,
capacity: 0,
item_size: (T::std140_size_static() + <T as AsStd140>::Std140Type::ALIGNMENT - 1)
& !(<T as AsStd140>::Std140Type::ALIGNMENT - 1),
}
}
}
impl<T: AsStd140> UniformVec<T> {
#[inline]
pub fn uniform_buffer(&self) -> Option<&Buffer> {
self.uniform_buffer.as_ref()
}
#[inline]
pub fn binding(&self) -> BindingResource {
BindingResource::Buffer(BufferBinding {
buffer: self.uniform_buffer().expect("uniform buffer should exist"),
offset: 0,
size: Some(NonZeroU64::new(self.item_size as u64).unwrap()),
})
}
#[inline]
pub fn len(&self) -> usize {
self.values.len()
}
#[inline]
pub fn is_empty(&self) -> bool {
self.values.is_empty()
}
#[inline]
pub fn capacity(&self) -> usize {
self.capacity
}
pub fn push(&mut self, value: T) -> usize {
let len = self.values.len();
if len < self.capacity {
self.values.push(value);
len
} else {
panic!(
"Cannot push value because capacity of {} has been reached",
self.capacity
);
}
}
pub fn reserve(&mut self, capacity: usize, device: &RenderDevice) {
if capacity > self.capacity {
self.capacity = capacity;
let size = self.item_size * capacity;
self.scratch.resize(size, 0);
self.uniform_buffer = Some(device.create_buffer(&BufferDescriptor {
label: None,
size: size as wgpu::BufferAddress,
usage: BufferUsage::COPY_DST | BufferUsage::UNIFORM,
mapped_at_creation: false,
}));
}
}
pub fn reserve_and_clear(&mut self, capacity: usize, device: &RenderDevice) {
self.clear();
self.reserve(capacity, device);
}
pub fn write_buffer(&mut self, queue: &RenderQueue) {
if let Some(uniform_buffer) = &self.uniform_buffer {
let range = 0..self.item_size * self.values.len();
let mut writer = std140::Writer::new(&mut self.scratch[range.clone()]);
writer.write(self.values.as_slice()).unwrap();
queue.write_buffer(uniform_buffer, 0, &mut self.scratch[range]);
}
}
pub fn clear(&mut self) {
self.values.clear();
}
}
pub struct DynamicUniformVec<T: AsStd140> {
uniform_vec: UniformVec<DynamicUniform<T>>,
}
impl<T: AsStd140> Default for DynamicUniformVec<T> {
fn default() -> Self {
Self {
uniform_vec: Default::default(),
}
}
}
impl<T: AsStd140> DynamicUniformVec<T> {
#[inline]
pub fn uniform_buffer(&self) -> Option<&Buffer> {
self.uniform_vec.uniform_buffer()
}
#[inline]
pub fn binding(&self) -> BindingResource {
self.uniform_vec.binding()
}
#[inline]
pub fn len(&self) -> usize {
self.uniform_vec.len()
}
#[inline]
pub fn is_empty(&self) -> bool {
self.uniform_vec.is_empty()
}
#[inline]
pub fn capacity(&self) -> usize {
self.uniform_vec.capacity()
}
#[inline]
pub fn push(&mut self, value: T) -> u32 {
(self.uniform_vec.push(DynamicUniform(value)) * self.uniform_vec.item_size) as u32
}
#[inline]
pub fn reserve(&mut self, capacity: usize, device: &RenderDevice) {
self.uniform_vec.reserve(capacity, device);
}
#[inline]
pub fn reserve_and_clear(&mut self, capacity: usize, device: &RenderDevice) {
self.uniform_vec.reserve_and_clear(capacity, device);
}
#[inline]
pub fn write_buffer(&mut self, queue: &RenderQueue) {
self.uniform_vec.write_buffer(queue);
}
#[inline]
pub fn clear(&mut self) {
self.uniform_vec.clear();
}
}