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use std::error;
use std::fmt;
use VulkanObject;
use buffer::BufferAccess;
use device::Device;
use device::DeviceOwned;
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(())
}
#[derive(Debug, Copy, Clone)]
pub enum CheckFillBufferError {
BufferMissingUsage,
WrongAlignment,
}
impl error::Error for CheckFillBufferError {
#[inline]
fn description(&self) -> &str {
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"
},
}
}
}
impl fmt::Display for CheckFillBufferError {
#[inline]
fn fmt(&self, fmt: &mut fmt::Formatter) -> Result<(), fmt::Error> {
write!(fmt, "{}", error::Error::description(self))
}
}
#[cfg(test)]
mod tests {
use super::*;
use buffer::BufferUsage;
use buffer::CpuAccessibleBuffer;
#[test]
fn missing_usage() {
let (device, queue) = gfx_dev_and_queue!();
let buffer =
CpuAccessibleBuffer::from_data(device.clone(), BufferUsage::vertex_buffer(), 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(), 0u32).unwrap();
assert_should_panic!({
let _ = check_fill_buffer(&dev2, &buffer);
});
}
}