embarkstudios/gpu-allocator

🦀 Memory allocator written in pure Rust for GPU memory in Vulkan and in the future DirectX 12

📒 gpu-allocator

[dependencies]
gpu-allocator = "0.25.0"

This crate provides a fully written in Rust memory allocator for Vulkan, DirectX 12 and Metal.

Windows-rs and winapi

gpu-allocator recently migrated from winapi to windows-rs but still provides convenient helpers to convert to and from winapi types, enabled when compiling with the public-winapi crate feature.

Setting up the Vulkan memory allocator

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

use gpu_allocator::vulkan::*;
use gpu_allocator::MemoryLocation;

// Setup vulkan info
let vk_info = vk::BufferCreateInfo::builder()
    .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

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

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

use gpu_allocator::metal::*;

let mut allocator = Allocator::new(&AllocatorCreateDesc {
    device: device.clone(),
    debug_settings: Default::default(),
    allocation_sizes: Default::default(),
});

Simple Metal allocation example

use gpu_allocator::metal::*;
use gpu_allocator::MemoryLocation;

let allocation_desc = AllocationCreateDesc::buffer(
    &device,
    "Example allocation",
    512, // size in bytes
    gpu_allocator::MemoryLocation::GpuOnly,
);
let allocation = allocator.allocate(&allocation_desc).unwrap();
let resource = allocation.make_buffer().unwrap();

// Cleanup
drop(resource);
allocator.free(&allocation).unwrap();

Minimum Supported Rust Version

The MSRV for this crate and the vulkan, d3d12 and metal features is Rust 1.65. 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 or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Alternative libraries

• 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.