# 📒 gpu-allocator
[](https://github.com/Traverse-Research/gpu-allocator/actions)
[](https://crates.io/crates/gpu-allocator)
[](https://docs.rs/gpu-allocator/)
[](LICENSE-MIT)
[](LICENSE-APACHE)
[](../main/CODE_OF_CONDUCT.md)
[](https://blog.rust-lang.org/2023/07/13/Rust-1.71.0.html)
[](https://traverseresearch.nl)
```toml
[dependencies]
gpu-allocator = "0.28.0"
```
This crate provides a fully written in Rust memory allocator for Vulkan, DirectX 12 and Metal.
## Setting up the Vulkan memory allocator
```rust
use gpu_allocator::vulkan::*;
let mut allocator = Allocator::new(&AllocatorCreateDesc {
instance,
device,
physical_device,
debug_settings: Default::default(),
buffer_device_address: true, // Ideally, check the BufferDeviceAddressFeatures struct.
allocation_sizes: Default::default(),
});
```
## Simple Vulkan allocation example
```rust
use gpu_allocator::vulkan::*;
use gpu_allocator::MemoryLocation;
// Setup vulkan info
let vk_info = vk::BufferCreateInfo::default()
.size(512)
.usage(vk::BufferUsageFlags::STORAGE_BUFFER);
let buffer = unsafe { device.create_buffer(&vk_info, None) }.unwrap();
let requirements = unsafe { device.get_buffer_memory_requirements(buffer) };
let allocation = allocator
.allocate(&AllocationCreateDesc {
name: "Example allocation",
requirements,
location: MemoryLocation::CpuToGpu,
linear: true, // Buffers are always linear
allocation_scheme: AllocationScheme::GpuAllocatorManaged,
}).unwrap();
// Bind memory to the buffer
unsafe { device.bind_buffer_memory(buffer, allocation.memory(), allocation.offset()).unwrap() };
// Cleanup
allocator.free(allocation).unwrap();
unsafe { device.destroy_buffer(buffer, None) };
```
## Setting up the D3D12 memory allocator
```rust
use gpu_allocator::d3d12::*;
let mut allocator = Allocator::new(&AllocatorCreateDesc {
device: ID3D12DeviceVersion::Device(device),
debug_settings: Default::default(),
allocation_sizes: Default::default(),
});
```
## Simple d3d12 allocation example
```rust
use gpu_allocator::d3d12::*;
use gpu_allocator::MemoryLocation;
let buffer_desc = Direct3D12::D3D12_RESOURCE_DESC {
Dimension: Direct3D12::D3D12_RESOURCE_DIMENSION_BUFFER,
Alignment: 0,
Width: 512,
Height: 1,
DepthOrArraySize: 1,
MipLevels: 1,
Format: Dxgi::Common::DXGI_FORMAT_UNKNOWN,
SampleDesc: Dxgi::Common::DXGI_SAMPLE_DESC {
Count: 1,
Quality: 0,
},
Layout: Direct3D12::D3D12_TEXTURE_LAYOUT_ROW_MAJOR,
Flags: Direct3D12::D3D12_RESOURCE_FLAG_NONE,
};
let allocation_desc = AllocationCreateDesc::from_d3d12_resource_desc(
&allocator.device(),
&buffer_desc,
"Example allocation",
MemoryLocation::GpuOnly,
);
let allocation = allocator.allocate(&allocation_desc).unwrap();
let mut resource: Option<Direct3D12::ID3D12Resource> = None;
let hr = unsafe {
device.CreatePlacedResource(
allocation.heap(),
allocation.offset(),
&buffer_desc,
Direct3D12::D3D12_RESOURCE_STATE_COMMON,
None,
&mut resource,
)
}?;
// Cleanup
drop(resource);
allocator.free(allocation).unwrap();
```
## Setting up the Metal memory allocator
```rust
use gpu_allocator::metal::*;
let mut allocator = Allocator::new(&AllocatorCreateDesc {
device: device.clone(),
debug_settings: Default::default(),
allocation_sizes: Default::default(),
create_residency_set: false,
});
```
## Simple Metal allocation example
```rust
use gpu_allocator::metal::*;
use gpu_allocator::MemoryLocation;
let allocation_desc = AllocationCreateDesc::buffer(
&device,
"Example allocation",
512, // size in bytes
MemoryLocation::GpuOnly,
);
let allocation = allocator.allocate(&allocation_desc).unwrap();
let heap = unsafe { allocation.heap() };
let resource = unsafe {
heap.newBufferWithLength_options_offset(
allocation.size() as usize,
heap.resourceOptions(),
allocation.offset() as usize,
)
}
.unwrap();
// Cleanup
drop(resource);
allocator.free(&allocation).unwrap();
```
## `no_std` support
`no_std` support can be enabled by compiling with `--no-default-features` to disable `std` support and `--features hashbrown` for `Hash` collections that are only defined in `std` for internal usages in crate. For example:
```toml
[dependencies]
gpu-allocator = { version = "0.28.0", default-features = false, features = ["hashbrown", "other features"] }
```
To support both `std` and `no_std` builds in your project, use the following in your `Cargo.toml`:
```toml
[features]
default = ["std", "other features"]
std = ["gpu-allocator/std"]
hashbrown = ["gpu-allocator/hashbrown"]
other_features = []
[dependencies]
gpu-allocator = { version = "0.28.0", default-features = false }
```
## Minimum Supported Rust Version
The MSRV for this crate and the `vulkan`, `d3d12` and `metal` features is Rust **1.71**.
The `no_std` support requires Rust **1.81** or higher because `no_std` support of dependency `thiserror` requires `core::error::Error` which is stabilized in **1.81**.
Any other features such as the `visualizer` (with all the `egui` dependencies) may have a higher requirement and are not tested in our CI.
## License
Licensed under either of
- Apache License, Version 2.0, ([LICENSE-APACHE](../master/LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license ([LICENSE-MIT](../master/LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
## Alternative libraries
- [vk-mem-rs](https://github.com/gwihlidal/vk-mem-rs)
## Contribution
Unless you explicitly state otherwise, any contribution intentionally
submitted for inclusion in the work by you, as defined in the Apache-2.0
license, shall be dual licensed as above, without any additional terms or
conditions.