eden-emu/VulkanMemoryAllocator
19
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

VmaBlockMetadata_Buddy: Added (simple way of) respecting bufferImageGranularity.

Browse source 
Minor fixes in documentation.
This commit is contained in:
Adam Sawicki 2018-09-21 15:10:04 +02:00
parent 9933c5cadf
commit 1e8cf94558
1 changed files with 20 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

30
src/vk_mem_alloc.h
View file

@ -1965,23 +1965,23 @@ typedef enum VmaPoolCreateFlagBits {
(wasted memory). In that case, if you can make sure you always allocate only (wasted memory). In that case, if you can make sure you always allocate only
buffers and linear images or only optimal images out of this pool, use this flag buffers and linear images or only optimal images out of this pool, use this flag
to make allocator disregard Buffer-Image Granularity and so make allocations to make allocator disregard Buffer-Image Granularity and so make allocations
more optimal. faster and more optimal.
*/ */
VMA_POOL_CREATE_IGNORE_BUFFER_IMAGE_GRANULARITY_BIT = 0x00000002, VMA_POOL_CREATE_IGNORE_BUFFER_IMAGE_GRANULARITY_BIT = 0x00000002,
/** \brief Enables alternative, linear allocation algorithm in this pool. /** \brief Enables alternative, linear allocation algorithm in this pool.
Specify this flag to enable linear allocation algorithm, which always creates Specify this flag to enable linear allocation algorithm, which always creates
new allocations after last one and doesn't reuse space from allocations freed in new allocations after last one and doesn't reuse space from allocations freed in
between. It trades memory consumption for simplified algorithm and data between. It trades memory consumption for simplified algorithm and data
structure, which has better performance and uses less memory for metadata. structure, which has better performance and uses less memory for metadata.
By using this flag, you can achieve behavior of free-at-once, stack, By using this flag, you can achieve behavior of free-at-once, stack,
ring buffer, and double stack. For details, see documentation chapter ring buffer, and double stack. For details, see documentation chapter
\ref linear_algorithm. \ref linear_algorithm.
When using this flag, you must specify VmaPoolCreateInfo::maxBlockCount == 1 (or 0 for default). When using this flag, you must specify VmaPoolCreateInfo::maxBlockCount == 1 (or 0 for default).
*/ */
VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT = 0x00000004, VMA_POOL_CREATE_LINEAR_ALGORITHM_BIT = 0x00000004,
/** TODO */ /** TODO */
@ -9392,6 +9392,16 @@ bool VmaBlockMetadata_Buddy::CreateAllocationRequest(
{ {
VMA_ASSERT(!upperAddress && "VMA_ALLOCATION_CREATE_UPPER_ADDRESS_BIT can be used only with linear algorithm."); VMA_ASSERT(!upperAddress && "VMA_ALLOCATION_CREATE_UPPER_ADDRESS_BIT can be used only with linear algorithm.");
// Simple way to respect bufferImageGranularity. May be optimized some day.
// Whenever it might be an OPTIMAL image...
if(allocType == VMA_SUBALLOCATION_TYPE_UNKNOWN ||
allocType == VMA_SUBALLOCATION_TYPE_IMAGE_UNKNOWN ||
allocType == VMA_SUBALLOCATION_TYPE_IMAGE_OPTIMAL)
{
allocAlignment = VMA_MAX(allocAlignment, bufferImageGranularity);
allocSize = VMA_MAX(allocSize, bufferImageGranularity);
}
if(allocSize > m_UsableSize) if(allocSize > m_UsableSize)
{ {
return false; return false;