Quick start

Project setup

Vulkan Memory Allocator comes in form of a single header file. You don't need to build it as a separate library project. You can add this file directly to your project and submit it to code repository next to your other source files.

"Single header" doesn't mean that everything is contained in C/C++ declarations, like it tends to be in case of inline functions or C++ templates. It means that implementation is bundled with interface in a single file and needs to be extracted using preprocessor macro. If you don't do it properly, you will get linker errors.

To do it properly:

1. Include "vk_mem_alloc.h" file in each CPP file where you want to use the library. This includes declarations of all members of the library.
2. In exacly one CPP file define following macro before this include. It enables also internal definitions.

#define VMA_IMPLEMENTATION
#include "vk_mem_alloc.h"

It may be a good idea to create dedicated CPP file just for this purpose.

Initialization

At program startup:

1. Initialize Vulkan to have VkPhysicalDevice and VkDevice object.
2. Fill VmaAllocatorCreateInfo structure and create VmaAllocator object by calling vmaCreateAllocator().

VmaAllocatorCreateInfo allocatorInfo = {};
allocatorInfo.physicalDevice = physicalDevice;
allocatorInfo.device = device;

VmaAllocator allocator;
vmaCreateAllocator(&allocatorInfo, &allocator);

Resource allocation

When you want to create a buffer or image:

1. Fill VkBufferCreateInfo / VkImageCreateInfo structure.
2. Fill VmaAllocationCreateInfo structure.
3. Call vmaCreateBuffer() / vmaCreateImage() to get VkBuffer/VkImage with memory already allocated and bound to it.

VkBufferCreateInfo bufferInfo = { VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO };
bufferInfo.size = 65536;
bufferInfo.usage = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT;

VmaAllocationCreateInfo allocInfo = {};
allocInfo.usage = VMA_MEMORY_USAGE_GPU_ONLY;

VkBuffer buffer;
VmaAllocation allocation;
vmaCreateBuffer(allocator, &bufferInfo, &allocInfo, &buffer, &allocation, nullptr);

Don't forget to destroy your objects when no longer needed:

vmaDestroyBuffer(allocator, buffer, allocation);
vmaDestroyAllocator(allocator);