# Limits in maplibre::render::settings - Rust
Represents the sets of limits an adapter/device supports.

# Struct maplibre::render::settings::Limits

    #[repr(C)]pub struct Limits {Show 30 fields
        pub max_texture_dimension_1d: u32,
        pub max_texture_dimension_2d: u32,
        pub max_texture_dimension_3d: u32,
        pub max_texture_array_layers: u32,
        pub max_bind_groups: u32,
        pub max_bindings_per_bind_group: u32,
        pub max_dynamic_uniform_buffers_per_pipeline_layout: u32,
        pub max_dynamic_storage_buffers_per_pipeline_layout: u32,
        pub max_sampled_textures_per_shader_stage: u32,
        pub max_samplers_per_shader_stage: u32,
        pub max_storage_buffers_per_shader_stage: u32,
        pub max_storage_textures_per_shader_stage: u32,
        pub max_uniform_buffers_per_shader_stage: u32,
        pub max_uniform_buffer_binding_size: u32,
        pub max_storage_buffer_binding_size: u32,
        pub max_vertex_buffers: u32,
        pub max_buffer_size: u64,
        pub max_vertex_attributes: u32,
        pub max_vertex_buffer_array_stride: u32,
        pub min_uniform_buffer_offset_alignment: u32,
        pub min_storage_buffer_offset_alignment: u32,
        pub max_inter_stage_shader_components: u32,
        pub max_compute_workgroup_storage_size: u32,
        pub max_compute_invocations_per_workgroup: u32,
        pub max_compute_workgroup_size_x: u32,
        pub max_compute_workgroup_size_y: u32,
        pub max_compute_workgroup_size_z: u32,
        pub max_compute_workgroups_per_dimension: u32,
        pub max_push_constant_size: u32,
        pub max_non_sampler_bindings: u32,
    }

Expand description

Represents the sets of limits an adapter/device supports.

We provide three different defaults.

- `Limits::downlevel_defaults()`. This is a set of limits that is guaranteed to work on almost all backends, including “downlevel” backends such as OpenGL and D3D11, other than WebGL. For most applications we recommend using these limits, assuming they are high enough for your application, and you do not intent to support WebGL.
- `Limits::downlevel_webgl2_defaults()` This is a set of limits that is lower even than the `downlevel_defaults()`, configured to be low enough to support running in the browser using WebGL2.
- `Limits::default()`. This is the set of limits that is guaranteed to work on all modern backends and is guaranteed to be supported by WebGPU. Applications needing more modern features can use this as a reasonable set of limits if they are targeting only desktop and modern mobile devices.

We recommend starting with the most restrictive limits you can and manually increasing the limits you need boosted. This will let you stay running on all hardware that supports the limits you need.

Limits “better” than the default must be supported by the adapter and requested when requesting a device. If limits “better” than the adapter supports are requested, requesting a device will panic. Once a device is requested, you may only use resources up to the limits requested even if the adapter supports “better” limits.

Requesting limits that are “better” than you need may cause performance to decrease because the implementation needs to support more than is needed. You should ideally only request exactly what you need.

Corresponds to WebGPU `GPUSupportedLimits`.

## Fields§

§ `max_texture_dimension_1d: u32`

Maximum allowed value for the `size.width` of a texture created with `TextureDimension::D1`. Defaults to 8192. Higher is “better”.

§ `max_texture_dimension_2d: u32`

Maximum allowed value for the `size.width` and `size.height` of a texture created with `TextureDimension::D2`. Defaults to 8192. Higher is “better”.

§ `max_texture_dimension_3d: u32`

Maximum allowed value for the `size.width`, `size.height`, and `size.depth_or_array_layers` of a texture created with `TextureDimension::D3`. Defaults to 2048. Higher is “better”.

§ `max_texture_array_layers: u32`

Maximum allowed value for the `size.depth_or_array_layers` of a texture created with `TextureDimension::D2`. Defaults to 256. Higher is “better”.

§ `max_bind_groups: u32`

Amount of bind groups that can be attached to a pipeline at the same time. Defaults to 4. Higher is “better”.

§ `max_bindings_per_bind_group: u32`

Maximum binding index allowed in `create_bind_group_layout`. Defaults to 1000. Higher is “better”.

§ `max_dynamic_uniform_buffers_per_pipeline_layout: u32`

Amount of uniform buffer bindings that can be dynamic in a single pipeline. Defaults to 8. Higher is “better”.

§ `max_dynamic_storage_buffers_per_pipeline_layout: u32`

Amount of storage buffer bindings that can be dynamic in a single pipeline. Defaults to 4. Higher is “better”.

§ `max_sampled_textures_per_shader_stage: u32`

Amount of sampled textures visible in a single shader stage. Defaults to 16. Higher is “better”.

§ `max_samplers_per_shader_stage: u32`

Amount of samplers visible in a single shader stage. Defaults to 16. Higher is “better”.

§ `max_storage_buffers_per_shader_stage: u32`

Amount of storage buffers visible in a single shader stage. Defaults to 8. Higher is “better”.

§ `max_storage_textures_per_shader_stage: u32`

Amount of storage textures visible in a single shader stage. Defaults to 4. Higher is “better”.

§ `max_uniform_buffers_per_shader_stage: u32`

Amount of uniform buffers visible in a single shader stage. Defaults to 12. Higher is “better”.

§ `max_uniform_buffer_binding_size: u32`

Maximum size in bytes of a binding to a uniform buffer. Defaults to 64 KiB. Higher is “better”.

§ `max_storage_buffer_binding_size: u32`

Maximum size in bytes of a binding to a storage buffer. Defaults to 128 MiB. Higher is “better”.

§ `max_vertex_buffers: u32`

Maximum length of `VertexState::buffers` when creating a `RenderPipeline`. Defaults to 8. Higher is “better”.

§ `max_buffer_size: u64`

A limit above which buffer allocations are guaranteed to fail. Defaults to 256 MiB. Higher is “better”.

Buffer allocations below the maximum buffer size may not succeed depending on available memory, fragmentation and other factors.

§ `max_vertex_attributes: u32`

Maximum length of `VertexBufferLayout::attributes`, summed over all `VertexState::buffers`, when creating a `RenderPipeline`. Defaults to 16. Higher is “better”.

§ `max_vertex_buffer_array_stride: u32`

Maximum value for `VertexBufferLayout::array_stride` when creating a `RenderPipeline`. Defaults to 2048. Higher is “better”.

§ `min_uniform_buffer_offset_alignment: u32`

Required `BufferBindingType::Uniform` alignment for `BufferBinding::offset` when creating a `BindGroup`, or for `set_bind_group` `dynamicOffsets`. Defaults to 256. Lower is “better”.

§ `min_storage_buffer_offset_alignment: u32`

Required `BufferBindingType::Storage` alignment for `BufferBinding::offset` when creating a `BindGroup`, or for `set_bind_group` `dynamicOffsets`. Defaults to 256. Lower is “better”.

§ `max_inter_stage_shader_components: u32`

Maximum allowed number of components (scalars) of input or output locations for inter-stage communication (vertex outputs to fragment inputs). Defaults to 60. Higher is “better”.

§ `max_compute_workgroup_storage_size: u32`

Maximum number of bytes used for workgroup memory in a compute entry point. Defaults to 16352. Higher is “better”.

§ `max_compute_invocations_per_workgroup: u32`

Maximum value of the product of the `workgroup_size` dimensions for a compute entry-point. Defaults to 256. Higher is “better”.

§ `max_compute_workgroup_size_x: u32`

The maximum value of the workgroup_size X dimension for a compute stage `ShaderModule` entry-point. Defaults to 256. Higher is “better”.

§ `max_compute_workgroup_size_y: u32`

The maximum value of the workgroup_size Y dimension for a compute stage `ShaderModule` entry-point. Defaults to 256. Higher is “better”.

§ `max_compute_workgroup_size_z: u32`

The maximum value of the workgroup_size Z dimension for a compute stage `ShaderModule` entry-point. Defaults to 64. Higher is “better”.

§ `max_compute_workgroups_per_dimension: u32`

The maximum value for each dimension of a `ComputePass::dispatch(x, y, z)` operation. Defaults to 65535. Higher is “better”.

§ `max_push_constant_size: u32`

Amount of storage available for push constants in bytes. Defaults to 0. Higher is “better”. Requesting more than 0 during device creation requires `Features::PUSH_CONSTANTS` to be enabled.

Expect the size to be:

- Vulkan: 128-256 bytes
- DX12: 256 bytes
- Metal: 4096 bytes
- DX11 & OpenGL don’t natively support push constants, and are emulated with uniforms, so this number is less useful but likely 256.

§ `max_non_sampler_bindings: u32`

Maximum number of live non-sampler bindings.

This limit only affects the d3d12 backend. Using a large number will allow the device to create many bind groups at the cost of a large up-front allocation at device creation.

## Implementations§

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### impl Limits

#### pub fn downlevel_defaults() -> Limits

These default limits are guaranteed to be compatible with GLES-3.1, and D3D11

Those limits are as follows (different from default are marked with *):

    assert_eq!(Limits::downlevel_defaults(), Limits {
        max_texture_dimension_1d: 2048, // *
        max_texture_dimension_2d: 2048, // *
        max_texture_dimension_3d: 256, // *
        max_texture_array_layers: 256,
        max_bind_groups: 4,
        max_bindings_per_bind_group: 1000,
        max_dynamic_uniform_buffers_per_pipeline_layout: 8,
        max_dynamic_storage_buffers_per_pipeline_layout: 4,
        max_sampled_textures_per_shader_stage: 16,
        max_samplers_per_shader_stage: 16,
        max_storage_buffers_per_shader_stage: 4, // *
        max_storage_textures_per_shader_stage: 4,
        max_uniform_buffers_per_shader_stage: 12,
        max_uniform_buffer_binding_size: 16 << 10, // * (16 KiB)
        max_storage_buffer_binding_size: 128 << 20, // (128 MiB)
        max_vertex_buffers: 8,
        max_vertex_attributes: 16,
        max_vertex_buffer_array_stride: 2048,
        max_push_constant_size: 0,
        min_uniform_buffer_offset_alignment: 256,
        min_storage_buffer_offset_alignment: 256,
        max_inter_stage_shader_components: 60,
        max_compute_workgroup_storage_size: 16352,
        max_compute_invocations_per_workgroup: 256,
        max_compute_workgroup_size_x: 256,
        max_compute_workgroup_size_y: 256,
        max_compute_workgroup_size_z: 64,
        max_compute_workgroups_per_dimension: 65535,
        max_buffer_size: 256 << 20, // (256 MiB)
        max_non_sampler_bindings: 1_000_000,
    });

#### pub fn downlevel_webgl2_defaults() -> Limits

These default limits are guaranteed to be compatible with GLES-3.0, and D3D11, and WebGL2

Those limits are as follows (different from `downlevel_defaults` are marked with +, *’s from `downlevel_defaults` shown as well.):

    assert_eq!(Limits::downlevel_webgl2_defaults(), Limits {
        max_texture_dimension_1d: 2048, // *
        max_texture_dimension_2d: 2048, // *
        max_texture_dimension_3d: 256, // *
        max_texture_array_layers: 256,
        max_bind_groups: 4,
        max_bindings_per_bind_group: 1000,
        max_dynamic_uniform_buffers_per_pipeline_layout: 8,
        max_dynamic_storage_buffers_per_pipeline_layout: 0, // +
        max_sampled_textures_per_shader_stage: 16,
        max_samplers_per_shader_stage: 16,
        max_storage_buffers_per_shader_stage: 0, // * +
        max_storage_textures_per_shader_stage: 0, // +
        max_uniform_buffers_per_shader_stage: 11, // +
        max_uniform_buffer_binding_size: 16 << 10, // * (16 KiB)
        max_storage_buffer_binding_size: 0, // * +
        max_vertex_buffers: 8,
        max_vertex_attributes: 16,
        max_vertex_buffer_array_stride: 255, // +
        max_push_constant_size: 0,
        min_uniform_buffer_offset_alignment: 256,
        min_storage_buffer_offset_alignment: 256,
        max_inter_stage_shader_components: 31,
        max_compute_workgroup_storage_size: 0, // +
        max_compute_invocations_per_workgroup: 0, // +
        max_compute_workgroup_size_x: 0, // +
        max_compute_workgroup_size_y: 0, // +
        max_compute_workgroup_size_z: 0, // +
        max_compute_workgroups_per_dimension: 0, // +
        max_buffer_size: 256 << 20, // (256 MiB),
        max_non_sampler_bindings: 1_000_000,
    });

#### pub fn using_resolution(self, other: Limits) -> Limits

Modify the current limits to use the resolution limits of the other.

This is useful because the swapchain might need to be larger than any other image in the application.

If your application only needs 512x512, you might be running on a 4k display and need extremely high resolution limits.

#### pub fn using_alignment(self, other: Limits) -> Limits

Modify the current limits to use the buffer alignment limits of the adapter.

This is useful for when you’d like to dynamically use the “best” supported buffer alignments.

#### pub fn check_limits(&self, allowed: &Limits) -> bool

Compares every limits within self is within the limits given in `allowed`.

If you need detailed information on failures, look at `Limits::check_limits_with_fail_fn`.

#### pub fn check_limits_with_fail_fn( &self, allowed: &Limits, fatal: bool, fail_fn: impl FnMut(&'static str, u64, u64) )

Compares every limits within self is within the limits given in `allowed`. For an easy to use binary choice, use `Limits::check_limits`.

If a value is not within the allowed limit, this function calls the `fail_fn` with the:

- limit name
- self’s limit
- allowed’s limit.

If fatal is true, a single failure bails out the comparison after a single failure.

## Trait Implementations§

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### impl Clone for Limits

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#### fn clone(&self) -> Limits

Returns a copy of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl Debug for Limits

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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### impl Default for Limits

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#### fn default() -> Limits

Returns the “default value” for a type. Read more
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### impl Hash for Limits

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#### fn hash<__H>(&self, state: &mut __H)
where __H: Hasher,

Feeds this value into the given `Hasher`. Read more
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#### fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given `Hasher`. Read more
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### impl PartialEq for Limits

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#### fn eq(&self, other: &Limits) -> bool

This method tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

This method tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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### impl Eq for Limits

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### impl StructuralEq for Limits

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### impl StructuralPartialEq for Limits

## Auto Trait Implementations§

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### impl RefUnwindSafe for Limits

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### impl Send for Limits

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### impl Sync for Limits

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