Struct vma::AllocatorPoolCreateFlags

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pub struct AllocatorPoolCreateFlags { /* private fields */ }

Expand description

Flags for configuring AllocatorPool construction.

Implementations§

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impl AllocatorPoolCreateFlags

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pub const IGNORE_BUFFER_IMAGE_GRANULARITY: Self = _

Use this flag if you always allocate only buffers and linear images or only optimal images out of this pool and so buffer-image granularity can be ignored.

This is an optional optimization flag.

If you always allocate using Allocator::create_buffer, Allocator::create_image, Allocator::allocate_memory_for_buffer, then you don’t need to use it because allocator knows exact type of your allocations so it can handle buffer-image granularity in the optimal way.

If you also allocate using Allocator::allocate_memory_for_image or Allocator::allocate_memory, exact type of such allocations is not known, so allocator must be conservative in handling buffer-image granularity, which can lead to suboptimal allocation (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 to make allocator disregard buffer-image granularity and so make allocations faster and more optimal.

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pub const LINEAR_ALGORITHM: Self = _

Enables alternative, linear allocation algorithm in this pool.

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 between. It trades memory consumption for simplified algorithm and data structure, which has better performance and uses less memory for metadata.

By using this flag, you can achieve behavior of free-at-once, stack, ring buffer, and double stack.

When using this flag, you must specify PoolCreateInfo::max_block_count == 1 (or 0 for default).

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pub const ALGORITHM_MASK: Self = _

Bit mask to extract only *_ALGORITHM bits from entire set of flags.

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pub const fn empty() -> Self

Returns an empty set of flags.

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pub const fn all() -> Self

Returns the set containing all flags.

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pub const fn bits(&self) -> u32

Returns the raw value of the flags currently stored.

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pub const fn from_bits(bits: u32) -> Option<Self>

Convert from underlying bit representation, unless that representation contains bits that do not correspond to a flag.

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pub const fn from_bits_truncate(bits: u32) -> Self

Convert from underlying bit representation, dropping any bits that do not correspond to flags.

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pub const unsafe fn from_bits_unchecked(bits: u32) -> Self

Convert from underlying bit representation, preserving all bits (even those not corresponding to a defined flag).

Safety

The caller of the bitflags! macro can chose to allow or disallow extra bits for their bitflags type.

The caller of from_bits_unchecked() has to ensure that all bits correspond to a defined flag or that extra bits are valid for this bitflags type.

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pub const fn is_empty(&self) -> bool

Returns true if no flags are currently stored.

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pub const fn is_all(&self) -> bool

Returns true if all flags are currently set.

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pub const fn intersects(&self, other: Self) -> bool

Returns true if there are flags common to both self and other.

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pub const fn contains(&self, other: Self) -> bool

Returns true if all of the flags in other are contained within self.

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pub fn insert(&mut self, other: Self)

Inserts the specified flags in-place.

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pub fn remove(&mut self, other: Self)

Removes the specified flags in-place.

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pub fn toggle(&mut self, other: Self)

Toggles the specified flags in-place.

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pub fn set(&mut self, other: Self, value: bool)

Inserts or removes the specified flags depending on the passed value.

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pub const fn intersection(self, other: Self) -> Self

Returns the intersection between the flags in self and other.

Specifically, the returned set contains only the flags which are present in both self and other.

This is equivalent to using the & operator (e.g. ops::BitAnd), as in flags & other.

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pub const fn union(self, other: Self) -> Self

Returns the union of between the flags in self and other.

Specifically, the returned set contains all flags which are present in either self or other, including any which are present in both (see Self::symmetric_difference if that is undesirable).

This is equivalent to using the | operator (e.g. ops::BitOr), as in flags | other.

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pub const fn difference(self, other: Self) -> Self

Returns the difference between the flags in self and other.

Specifically, the returned set contains all flags present in self, except for the ones present in other.

It is also conceptually equivalent to the “bit-clear” operation: flags & !other (and this syntax is also supported).

This is equivalent to using the - operator (e.g. ops::Sub), as in flags - other.

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pub const fn symmetric_difference(self, other: Self) -> Self

Returns the symmetric difference between the flags in self and other.

Specifically, the returned set contains the flags present which are present in self or other, but that are not present in both. Equivalently, it contains the flags present in exactly one of the sets self and other.

This is equivalent to using the ^ operator (e.g. ops::BitXor), as in flags ^ other.

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