Flutter Impeller
impeller::AllocatorVK Class Referencefinal

#include <allocator_vk.h>

Inheritance diagram for impeller::AllocatorVK:
impeller::Allocator

Public Member Functions

 ~AllocatorVK () override
 
Bytes DebugGetHeapUsage () const override
 
- Public Member Functions inherited from impeller::Allocator
virtual ~Allocator ()
 
bool IsValid () const
 
std::shared_ptr< DeviceBufferCreateBuffer (const DeviceBufferDescriptor &desc)
 
std::shared_ptr< TextureCreateTexture (const TextureDescriptor &desc)
 
virtual uint16_t MinimumBytesPerRow (PixelFormat format) const
 Minimum value for row_bytes on a Texture. The row bytes parameter of that method must be aligned to this value. More...
 
std::shared_ptr< DeviceBufferCreateBufferWithCopy (const uint8_t *buffer, size_t length)
 
std::shared_ptr< DeviceBufferCreateBufferWithCopy (const fml::Mapping &mapping)
 

Static Public Member Functions

static int32_t FindMemoryTypeIndex (uint32_t memory_type_bits_requirement, vk::PhysicalDeviceMemoryProperties &memory_properties)
 Select a matching memory type for the given [memory_type_bits_requirement], or -1 if none is found. More...
 
static vk::ImageUsageFlags ToVKImageUsageFlags (PixelFormat format, TextureUsageMask usage, StorageMode mode, bool supports_memoryless_textures)
 

Friends

class ContextVK
 

Additional Inherited Members

- Protected Member Functions inherited from impeller::Allocator
 Allocator ()
 

Detailed Description

Definition at line 19 of file allocator_vk.h.

Constructor & Destructor Documentation

◆ ~AllocatorVK()

impeller::AllocatorVK::~AllocatorVK ( )
overridedefault

Member Function Documentation

◆ DebugGetHeapUsage()

Bytes impeller::AllocatorVK::DebugGetHeapUsage ( ) const
overridevirtual

Reimplemented from impeller::Allocator.

Definition at line 552 of file allocator_vk.cc.

552  {
553  auto count = memory_properties_.memoryHeapCount;
554  std::vector<VmaBudget> budgets(count);
555  vmaGetHeapBudgets(allocator_.get(), budgets.data());
556  size_t total_usage = 0;
557  for (auto i = 0u; i < count; i++) {
558  const VmaBudget& budget = budgets[i];
559  total_usage += budget.usage;
560  }
561  return Bytes{static_cast<double>(total_usage)};
562 }
AllocationSize< 1u > Bytes

◆ FindMemoryTypeIndex()

int32_t impeller::AllocatorVK::FindMemoryTypeIndex ( uint32_t  memory_type_bits_requirement,
vk::PhysicalDeviceMemoryProperties &  memory_properties 
)
static

Select a matching memory type for the given [memory_type_bits_requirement], or -1 if none is found.

This only returns memory types with deviceLocal allocations.

Definition at line 180 of file allocator_vk.cc.

182  {
183  int32_t type_index = -1;
184  vk::MemoryPropertyFlagBits required_properties =
185  vk::MemoryPropertyFlagBits::eDeviceLocal;
186 
187  const uint32_t memory_count = memory_properties.memoryTypeCount;
188  for (uint32_t memory_index = 0; memory_index < memory_count; ++memory_index) {
189  const uint32_t memory_type_bits = (1 << memory_index);
190  const bool is_required_memory_type =
191  memory_type_bits_requirement & memory_type_bits;
192 
193  const auto properties =
194  memory_properties.memoryTypes[memory_index].propertyFlags;
195  const bool has_required_properties =
196  (properties & required_properties) == required_properties;
197 
198  if (is_required_memory_type && has_required_properties) {
199  return static_cast<int32_t>(memory_index);
200  }
201  }
202 
203  return type_index;
204 }

Referenced by impeller::testing::TEST().

◆ ToVKImageUsageFlags()

vk::ImageUsageFlags impeller::AllocatorVK::ToVKImageUsageFlags ( PixelFormat  format,
TextureUsageMask  usage,
StorageMode  mode,
bool  supports_memoryless_textures 
)
static

Definition at line 206 of file allocator_vk.cc.

210  {
211  vk::ImageUsageFlags vk_usage;
212 
213  switch (mode) {
216  break;
218  if (supports_memoryless_textures) {
219  vk_usage |= vk::ImageUsageFlagBits::eTransientAttachment;
220  }
221  break;
222  }
223 
224  if (usage & TextureUsage::kRenderTarget) {
225  if (PixelFormatIsDepthStencil(format)) {
226  vk_usage |= vk::ImageUsageFlagBits::eDepthStencilAttachment;
227  } else {
228  vk_usage |= vk::ImageUsageFlagBits::eColorAttachment;
229  vk_usage |= vk::ImageUsageFlagBits::eInputAttachment;
230  }
231  }
232 
233  if (usage & TextureUsage::kShaderRead) {
234  vk_usage |= vk::ImageUsageFlagBits::eSampled;
235  }
236 
237  if (usage & TextureUsage::kShaderWrite) {
238  vk_usage |= vk::ImageUsageFlagBits::eStorage;
239  }
240 
241  if (mode != StorageMode::kDeviceTransient) {
242  // Add transfer usage flags to support blit passes only if image isn't
243  // device transient.
244  vk_usage |= vk::ImageUsageFlagBits::eTransferSrc |
245  vk::ImageUsageFlagBits::eTransferDst;
246  }
247 
248  return vk_usage;
249 }
constexpr bool PixelFormatIsDepthStencil(PixelFormat format)
Definition: formats_vk.h:414

References impeller::PixelFormatIsDepthStencil().

Referenced by impeller::testing::TEST().

Friends And Related Function Documentation

◆ ContextVK

friend class ContextVK
friend

Definition at line 43 of file allocator_vk.h.


The documentation for this class was generated from the following files: