Struct IndirectParametersMetadata 

#[repr(C)]
pub struct IndirectParametersMetadata {
    pub base_output_index: u32,
    pub batch_set_index: u32,
    pub mesh_index: u32,
    pub early_instance_count: u32,
    pub late_instance_count: u32,
}

A structure, written and read on GPU, that records how many instances of each mesh are actually to be drawn.

The GPU mesh preprocessing shader increments the Self::early_instance_count and Self::late_instance_count as it determines that meshes are visible. The indirect parameter building shader reads this metadata in order to construct the indirect draw parameters.

Each batch will have one instance of this structure.

Fields

base_output_index: u32

The index of the first instance of this mesh in the array of MeshUniforms.

Note that this is the first output index in this batch. Since each instance of this structure refers to arbitrarily many instances, the MeshUniforms corresponding to this batch span the indices base_output_index..(base_output_index + instance_count).

batch_set_index: u32

The index of the batch set that this batch belongs to in the IndirectBatchSet buffer.

A batch set is a set of meshes that may be multi-drawn together. Multiple batches (and therefore multiple instances of IndirectParametersMetadata structures) can be part of the same batch set.

mesh_index: u32

The index of the first mesh in this batch in the array of MeshInputUniforms.

early_instance_count: u32

The number of instances that were judged visible last frame.

The uniform allocation pass sets this value to 0, and the mesh preprocessing shader increments it as it culls mesh instances.

late_instance_count: u32

The number of instances that have been judged potentially visible this frame that weren’t in the last frame’s potentially visible set.

The uniform allocation pass sets this value to 0, and the mesh preprocessing shader increments it as it culls mesh instances.

Trait Implementations

impl Clone for IndirectParametersMetadata

fn clone(&self) -> IndirectParametersMetadata

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for IndirectParametersMetadata

impl CreateFrom for IndirectParametersMetadata

where IndirectParametersMetadata: ShaderType<ExtraMetadata = StructMetadata<5>>, u32: for<'__> CreateFrom + for<'__> CreateFrom + for<'__> CreateFrom + for<'__> CreateFrom + for<'__> CreateFrom,

fn create_from<B>(reader: &mut Reader<B>) -> IndirectParametersMetadata

where B: BufferRef,

impl Default for IndirectParametersMetadata

fn default() -> IndirectParametersMetadata

Returns the “default value” for a type.

impl Pod for IndirectParametersMetadata

impl ReadFrom for IndirectParametersMetadata

where IndirectParametersMetadata: ShaderType<ExtraMetadata = StructMetadata<5>>, u32: for<'__> ReadFrom + for<'__> ReadFrom + for<'__> ReadFrom + for<'__> ReadFrom + for<'__> ReadFrom,

fn read_from<B>(&mut self, reader: &mut Reader<B>)

where B: BufferRef,

impl ShaderSize for IndirectParametersMetadata

where u32: ShaderSize,

const SHADER_SIZE: NonZero<u64> = _

Represents WGSL Size (equivalent to ShaderType::min_size)

impl ShaderType for IndirectParametersMetadata

where u32: ShaderType + ShaderSize,

fn size(&self) -> NonZero<u64>

Returns the size of Self at runtime

fn min_size() -> NonZero<u64>

Represents the minimum size of Self (equivalent to GPUBufferBindingLayout.minBindingSize)

fn assert_uniform_compat()

Asserts that Self meets the requirements of the uniform address space restrictions on stored values and the uniform address space layout constraints

impl WriteInto for IndirectParametersMetadata

where IndirectParametersMetadata: ShaderType<ExtraMetadata = StructMetadata<5>>, u32: for<'__> WriteInto + for<'__> WriteInto + for<'__> WriteInto + for<'__> WriteInto + for<'__> WriteInto,

fn write_into<B>(&self, writer: &mut Writer<B>)

where B: BufferMut,

impl Zeroable for IndirectParametersMetadata

fn zeroed() -> Self

Calls zeroed.