📒 gpu-allocator

[dependencies]
gpu-allocator = "0.15.1"

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

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.
});

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
    }).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,
    debug_settings: Default::default(),
});

Simple d3d12 allocation example

use gpu_allocator::d3d12::*;
use gpu_allocator::MemoryLocation;


let buffer_desc = d3d12::D3D12_RESOURCE_DESC {
    Dimension: d3d12::D3D12_RESOURCE_DIMENSION_BUFFER,
    Alignment: 0,
    Width: 512,
    Height: 1,
    DepthOrArraySize: 1,
    MipLevels: 1,
    Format: dxgiformat::DXGI_FORMAT_UNKNOWN,
    SampleDesc: dxgitype::DXGI_SAMPLE_DESC {
        Count: 1,
        Quality: 0,
    },
    Layout: d3d12::D3D12_TEXTURE_LAYOUT_ROW_MAJOR,
    Flags: d3d12::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: *mut d3d12::ID3D12Resource = std::ptr::null_mut();
let hr = unsafe {
    device.as_ref().unwrap().CreatePlacedResource(
        allocation.heap().as_winapi_mut(),
        allocation.offset(),
        &buffer_desc,
        d3d12::D3D12_RESOURCE_STATE_COMMON,
        std::ptr::null(),
        &d3d12::IID_ID3D12Resource,
        &mut resource as *mut _ as *mut _,
    )
};
if hr != winerror::S_OK {
    panic!("Failed to create placed resource.");
}

// Cleanup
unsafe { resource.as_ref().unwrap().Release() };
allocator.free(allocation).unwrap();

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.