Struct PassState 

struct PassState<'a> {
    pipeline: Option<&'a RenderPipeline>,
    bind_groups: ArrayVec<(u32, &'a BindGroup), MAX_BIND_GROUPS>,
    vertex_buffers: ArrayVec<(u32, &'a Buffer, Range<u64>), MAX_VERTEX_BUFFERS>,
    index_buffer: Option<(&'a Buffer, Range<u64>, IndexFormat)>,
    scissor: Option<ScissorRect>,
    viewport: Option<ViewportRect>,
    stencil_reference: u32,
}

Which resources the previous draw left bound.

The entries borrow from the draws being recorded, which outlive the recording, so tracking them costs no clones. wgpu resources compare by identity, so a plain == is the fast “is this the same resource as last time” test the recording loop needs. The slots are fixed-capacity (MAX_BIND_GROUPS / MAX_VERTEX_BUFFERS) so recording a frame never allocates.

Fields

pipeline: Option<&'a RenderPipeline>

bind_groups: ArrayVec<(u32, &'a BindGroup), MAX_BIND_GROUPS>

vertex_buffers: ArrayVec<(u32, &'a Buffer, Range<u64>), MAX_VERTEX_BUFFERS>

index_buffer: Option<(&'a Buffer, Range<u64>, IndexFormat)>

scissor: Option<ScissorRect>

viewport: Option<ViewportRect>

stencil_reference: u32

Implementations

impl<'a> PassState<'a>

fn set_bind_group( &mut self, pass: &mut impl RenderPassInterface<'a>, index: u32, bind_group: &'a BindGroup, )

fn set_vertex_buffer( &mut self, pass: &mut impl RenderPassInterface<'a>, slot: u32, buffer: &'a Buffer, range: Range<u64>, )

Vertex-buffer slots are keyed by slot, and their value is the buffer and the byte range bound to it.

fn set_index_buffer( &mut self, pass: &mut impl RenderPassInterface<'a>, buffer: &'a Buffer, range: Range<u64>, format: IndexFormat, )

fn set_scissor( &mut self, pass: &mut impl RenderPassInterface<'a>, scissor: ScissorRect, )

Narrow rasterization to scissor, skipping the call when the pass already has that rectangle — a clip rectangle is usually shared by many consecutive draws.

fn set_viewport( &mut self, pass: &mut impl RenderPassInterface<'a>, viewport: ViewportRect, )

Set the viewport, skipping the call when the pass already holds that rectangle.

fn set_stencil_reference( &mut self, pass: &mut impl RenderPassInterface<'a>, reference: u32, )

Set the stencil reference, skipping the call when the pass already holds it.

Trait Implementations

impl<'a> Default for PassState<'a>

fn default() -> Self

Returns the “default value” for a type.