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Round up mappable buffer size to non-coherent atom, if needed

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Dzmitry Malyshau
2019-04-23 16:27:39 -04:00
parent 1f4d67aeb2
commit e2dcac91d2
1 changed files with 11 additions and 1 deletions
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12
wgpu-native/src/device.rs
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@@ -502,10 +502,20 @@ pub fn device_create_buffer(
.unwrap()
.into();
// TODO: allocate with rendy
// if the memory is mapped but not coherent, round up to the atom size
let mut mem_size = requirements.size;
if memory_properties.contains(hal::memory::Properties::CPU_VISIBLE) &&
!memory_properties.contains(hal::memory::Properties::COHERENT)
{
let mask = device.limits.non_coherent_atom_size as u64 - 1;
mem_size = ((mem_size - 1 ) | mask) + 1;
}
let memory = unsafe {
device
.raw
.allocate_memory(device_type, requirements.size)
.allocate_memory(device_type, mem_size)
.unwrap()
};
unsafe {