Flutter Impeller
impeller::AllocatorVK Class Referencefinal

#include <allocator_vk.h>

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

Public Member Functions

 ~AllocatorVK () override
 
size_t DebugGetHeapUsage () const
 
- 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()

size_t impeller::AllocatorVK::DebugGetHeapUsage ( ) const

Definition at line 512 of file allocator_vk.cc.

512  {
513  auto count = memory_properties_.memoryHeapCount;
514  std::vector<VmaBudget> budgets(count);
515  vmaGetHeapBudgets(allocator_.get(), budgets.data());
516  size_t total_usage = 0;
517  for (auto i = 0u; i < count; i++) {
518  const VmaBudget& budget = budgets[i];
519  total_usage += budget.usage;
520  }
521  // Convert bytes to MB.
522  total_usage *= 1e-6;
523  return total_usage;
524 }

◆ 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 173 of file allocator_vk.cc.

175  {
176  int32_t type_index = -1;
177  vk::MemoryPropertyFlagBits required_properties =
178  vk::MemoryPropertyFlagBits::eDeviceLocal;
179 
180  const uint32_t memory_count = memory_properties.memoryTypeCount;
181  for (uint32_t memory_index = 0; memory_index < memory_count; ++memory_index) {
182  const uint32_t memory_type_bits = (1 << memory_index);
183  const bool is_required_memory_type =
184  memory_type_bits_requirement & memory_type_bits;
185 
186  const auto properties =
187  memory_properties.memoryTypes[memory_index].propertyFlags;
188  const bool has_required_properties =
189  (properties & required_properties) == required_properties;
190 
191  if (is_required_memory_type && has_required_properties) {
192  return static_cast<int32_t>(memory_index);
193  }
194  }
195 
196  return type_index;
197 }

Referenced by impeller::ImportVKDeviceMemoryFromAndroidHarwareBuffer(), and impeller::testing::TEST().

◆ ToVKImageUsageFlags()

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

Definition at line 199 of file allocator_vk.cc.

203  {
204  vk::ImageUsageFlags vk_usage;
205 
206  switch (mode) {
209  break;
211  if (supports_memoryless_textures) {
212  vk_usage |= vk::ImageUsageFlagBits::eTransientAttachment;
213  }
214  break;
215  }
216 
217  if (usage & TextureUsage::kRenderTarget) {
218  if (PixelFormatIsDepthStencil(format)) {
219  vk_usage |= vk::ImageUsageFlagBits::eDepthStencilAttachment;
220  } else {
221  vk_usage |= vk::ImageUsageFlagBits::eColorAttachment;
222  vk_usage |= vk::ImageUsageFlagBits::eInputAttachment;
223  }
224  }
225 
226  if (usage & TextureUsage::kShaderRead) {
227  vk_usage |= vk::ImageUsageFlagBits::eSampled;
228  }
229 
230  if (usage & TextureUsage::kShaderWrite) {
231  vk_usage |= vk::ImageUsageFlagBits::eStorage;
232  }
233 
234  if (mode != StorageMode::kDeviceTransient) {
235  // Add transfer usage flags to support blit passes only if image isn't
236  // device transient.
237  vk_usage |= vk::ImageUsageFlagBits::eTransferSrc |
238  vk::ImageUsageFlagBits::eTransferDst;
239  }
240 
241  return vk_usage;
242 }

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:
impeller::TextureUsage::kShaderWrite
@ kShaderWrite
impeller::PixelFormatIsDepthStencil
constexpr bool PixelFormatIsDepthStencil(PixelFormat format)
Definition: formats_vk.h:392
impeller::TextureUsage::kRenderTarget
@ kRenderTarget
impeller::StorageMode::kHostVisible
@ kHostVisible
impeller::StorageMode::kDeviceTransient
@ kDeviceTransient
impeller::StorageMode::kDevicePrivate
@ kDevicePrivate
impeller::TextureUsage::kShaderRead
@ kShaderRead