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// Copyright (c) 2017 The vulkano developers
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or
// https://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or https://opensource.org/licenses/MIT>,
// at your option. All files in the project carrying such
// notice may not be copied, modified, or distributed except
// according to those terms.
use std::error;
use std::fmt;
use crate::buffer::BufferAccess;
use crate::device::Device;
use crate::device::DeviceOwned;
use crate::VulkanObject;
/// Checks whether a fill buffer command is valid.
///
/// # Panic
///
/// - Panics if the buffer not created with `device`.
///
pub fn check_fill_buffer<B>(device: &Device, buffer: &B) -> Result<(), CheckFillBufferError>
where
B: ?Sized + BufferAccess,
{
assert_eq!(
buffer.inner().buffer.device().internal_object(),
device.internal_object()
);
if !buffer.inner().buffer.usage().transfer_destination {
return Err(CheckFillBufferError::BufferMissingUsage);
}
if buffer.inner().offset % 4 != 0 {
return Err(CheckFillBufferError::WrongAlignment);
}
Ok(())
}
/// Error that can happen when attempting to add a `fill_buffer` command.
#[derive(Debug, Copy, Clone)]
pub enum CheckFillBufferError {
/// The "transfer destination" usage must be enabled on the buffer.
BufferMissingUsage,
/// The data or size must be 4-bytes aligned.
WrongAlignment,
}
impl error::Error for CheckFillBufferError {}
impl fmt::Display for CheckFillBufferError {
#[inline]
fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
write!(
fmt,
"{}",
match *self {
CheckFillBufferError::BufferMissingUsage => {
"the transfer destination usage must be enabled on the buffer"
}
CheckFillBufferError::WrongAlignment =>
"the offset or size are not aligned to 4 bytes",
}
)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::buffer::BufferUsage;
use crate::buffer::CpuAccessibleBuffer;
#[test]
fn missing_usage() {
let (device, queue) = gfx_dev_and_queue!();
let buffer = CpuAccessibleBuffer::from_data(
device.clone(),
BufferUsage::vertex_buffer(),
false,
0u32,
)
.unwrap();
match check_fill_buffer(&device, &buffer) {
Err(CheckFillBufferError::BufferMissingUsage) => (),
_ => panic!(),
}
}
#[test]
fn wrong_device() {
let (dev1, queue) = gfx_dev_and_queue!();
let (dev2, _) = gfx_dev_and_queue!();
let buffer = CpuAccessibleBuffer::from_data(dev1, BufferUsage::all(), false, 0u32).unwrap();
assert_should_panic!({
let _ = check_fill_buffer(&dev2, &buffer);
});
}
}
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