Struct RenderBundleEncoder

pub struct RenderBundleEncoder<'a> { /* private fields */ }

Encodes a series of GPU operations into a reusable “render bundle”.

It only supports a handful of render commands, but it makes them reusable. It can be created with Device::create_render_bundle_encoder. It can be executed onto a CommandEncoder using RenderPass::execute_bundles.

Executing a RenderBundle is often more efficient than issuing the underlying commands manually.

Corresponds to WebGPU GPURenderBundleEncoder.

Implementations

impl<'a> RenderBundleEncoder<'a>

pub fn finish(self, desc: &RenderBundleDescriptor<'_>) -> RenderBundle

Finishes recording and returns a RenderBundle that can be executed in other render passes.

pub fn set_bind_group<'b>( &mut self, index: u32, bind_group: impl Into<Option<&'a BindGroup>>, offsets: &[DynamicOffset], )

Sets the active bind group for a given bind group index. The bind group layout in the active pipeline when any draw() function is called must match the layout of this bind group.

If the bind group have dynamic offsets, provide them in the binding order.

pub fn set_pipeline(&mut self, pipeline: &'a RenderPipeline)

Sets the active render pipeline.

Subsequent draw calls will exhibit the behavior defined by pipeline.

pub fn set_index_buffer( &mut self, buffer_slice: BufferSlice<'a>, index_format: IndexFormat, )

Sets the active index buffer.

Subsequent calls to draw_indexed on this RenderBundleEncoder will use buffer as the source index buffer.

pub fn set_vertex_buffer(&mut self, slot: u32, buffer_slice: BufferSlice<'a>)

Assign a vertex buffer to a slot.

Subsequent calls to draw and draw_indexed on this RenderBundleEncoder will use buffer as one of the source vertex buffers.

The slot refers to the index of the matching descriptor in VertexState::buffers.

pub fn draw(&mut self, vertices: Range<u32>, instances: Range<u32>)

Draws primitives from the active vertex buffer(s).

The active vertex buffers can be set with RenderBundleEncoder::set_vertex_buffer. Does not use an Index Buffer. If you need this see RenderBundleEncoder::draw_indexed

Panics if vertices Range is outside of the range of the vertices range of any set vertex buffer.

vertices: The range of vertices to draw. instances: Range of Instances to draw. Use 0..1 if instance buffers are not used. E.g.of how its used internally

for instance_id in instance_range {
    for vertex_id in vertex_range {
        let vertex = vertex[vertex_id];
        vertex_shader(vertex, vertex_id, instance_id);
    }
}

pub fn draw_indexed( &mut self, indices: Range<u32>, base_vertex: i32, instances: Range<u32>, )

Draws indexed primitives using the active index buffer and the active vertex buffer(s).

The active index buffer can be set with RenderBundleEncoder::set_index_buffer. The active vertex buffer(s) can be set with RenderBundleEncoder::set_vertex_buffer.

Panics if indices Range is outside of the range of the indices range of any set index buffer.

indices: The range of indices to draw. base_vertex: value added to each index value before indexing into the vertex buffers. instances: Range of Instances to draw. Use 0..1 if instance buffers are not used. E.g.of how its used internally

for instance_id in instance_range {
    for index_index in index_range {
        let vertex_id = index_buffer[index_index];
        let adjusted_vertex_id = vertex_id + base_vertex;
        let vertex = vertex[adjusted_vertex_id];
        vertex_shader(vertex, adjusted_vertex_id, instance_id);
    }
}

pub fn draw_indirect( &mut self, indirect_buffer: &'a Buffer, indirect_offset: BufferAddress, )

Draws primitives from the active vertex buffer(s) based on the contents of the indirect_buffer.

The active vertex buffers can be set with RenderBundleEncoder::set_vertex_buffer.

The structure expected in indirect_buffer must conform to DrawIndirectArgs.

pub fn draw_indexed_indirect( &mut self, indirect_buffer: &'a Buffer, indirect_offset: BufferAddress, )

Draws indexed primitives using the active index buffer and the active vertex buffers, based on the contents of the indirect_buffer.

The active index buffer can be set with RenderBundleEncoder::set_index_buffer, while the active vertex buffers can be set with RenderBundleEncoder::set_vertex_buffer.

The structure expected in indirect_buffer must conform to DrawIndexedIndirectArgs.

impl<'a> RenderBundleEncoder<'a>

Features::PUSH_CONSTANTS must be enabled on the device in order to call these functions.

pub fn set_push_constants( &mut self, stages: ShaderStages, offset: u32, data: &[u8], )

Set push constant data.

Offset is measured in bytes, but must be a multiple of PUSH_CONSTANT_ALIGNMENT.

Data size must be a multiple of 4 and must have an alignment of 4. For example, with an offset of 4 and an array of [u8; 8], that will write to the range of 4..12.

For each byte in the range of push constant data written, the union of the stages of all push constant ranges that covers that byte must be exactly stages. There’s no good way of explaining this simply, so here are some examples:

For the given ranges:
- 0..4 Vertex
- 4..8 Fragment

You would need to upload this in two set_push_constants calls. First for the Vertex range, second for the Fragment range.

For the given ranges:
- 0..8  Vertex
- 4..12 Fragment

You would need to upload this in three set_push_constants calls. First for the Vertex only range 0..4, second for the Vertex | Fragment range 4..8, third for the Fragment range 8..12.

Trait Implementations

impl<'a> Debug for RenderBundleEncoder<'a>

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

Formats the value using the given formatter.

impl<'a> RenderEncoder<'a> for RenderBundleEncoder<'a>

fn set_bind_group( &mut self, index: u32, bind_group: Option<&'a BindGroup>, offsets: &[DynamicOffset], )

Sets the active bind group for a given bind group index. The bind group layout in the active pipeline when any draw() function is called must match the layout of this bind group.

fn set_pipeline(&mut self, pipeline: &'a RenderPipeline)

Sets the active render pipeline.

fn set_index_buffer( &mut self, buffer_slice: BufferSlice<'a>, index_format: IndexFormat, )

Sets the active index buffer.

fn set_vertex_buffer(&mut self, slot: u32, buffer_slice: BufferSlice<'a>)

Assign a vertex buffer to a slot.

fn draw(&mut self, vertices: Range<u32>, instances: Range<u32>)

Draws primitives from the active vertex buffer(s).

fn draw_indexed( &mut self, indices: Range<u32>, base_vertex: i32, instances: Range<u32>, )

Draws indexed primitives using the active index buffer and the active vertex buffers.

fn draw_indirect( &mut self, indirect_buffer: &'a Buffer, indirect_offset: BufferAddress, )

Draws primitives from the active vertex buffer(s) based on the contents of the indirect_buffer.

fn draw_indexed_indirect( &mut self, indirect_buffer: &'a Buffer, indirect_offset: BufferAddress, )

Draws indexed primitives using the active index buffer and the active vertex buffers, based on the contents of the indirect_buffer.

fn set_push_constants(&mut self, stages: ShaderStages, offset: u32, data: &[u8])

wgt::Features::PUSH_CONSTANTS must be enabled on the device in order to call this function.