Struct IndirectBuffer 

pub struct IndirectBuffer<T: IndirectCommand> { /* private fields */ }

A type-safe GPU buffer for indirect draw commands.

This wrapper ensures type safety and provides convenient methods for writing and using indirect draw commands.

Type Parameters

• T - The type of indirect command (either DrawIndirect or DrawIndexedIndirect)

Example

use astrelis_render::{IndirectBuffer, DrawIndexedIndirect, Renderer};

// Create an indirect buffer for 100 indexed draw commands
let indirect_buffer = IndirectBuffer::<DrawIndexedIndirect>::new(
    context,
    Some("My Indirect Buffer"),
    100,
);

// Write commands
let commands = vec![
    DrawIndexedIndirect::single(36),  // Draw 36 indices
    DrawIndexedIndirect::instanced(36, 10),  // Draw 36 indices, 10 instances
];
indirect_buffer.write(&context.queue, &commands);

// In render pass
render_pass.draw_indexed_indirect(indirect_buffer.buffer(), 0);

Implementations

impl<T: IndirectCommand> IndirectBuffer<T>

pub fn new( context: &GraphicsContext, label: Option<&str>, capacity: usize, ) -> Self

Create a new indirect buffer with the specified capacity.

Arguments

• context - The graphics context
• label - Optional debug label
• capacity - Maximum number of commands the buffer can hold

Panics

Panics if INDIRECT_FIRST_INSTANCE feature is not enabled on the context.

pub fn new_init( context: &GraphicsContext, label: Option<&str>, commands: &[T], ) -> Self

Create a new indirect buffer initialized with commands.

Arguments

• context - The graphics context
• label - Optional debug label
• commands - Initial commands to write to the buffer

Panics

Panics if INDIRECT_FIRST_INSTANCE feature is not enabled on the context.

pub fn buffer(&self) -> &Buffer

Get the underlying wgpu buffer.

pub fn capacity(&self) -> usize

Get the capacity (maximum number of commands).

pub fn size_bytes(&self) -> u64

Get the size of the buffer in bytes.

pub fn offset_of(&self, index: usize) -> u64

Get the byte offset of a command at the given index.

pub fn write_at(&self, queue: &Queue, start_index: usize, commands: &[T])

Write commands to the buffer starting at the given index.

Arguments

• queue - The command queue to use for the write
• start_index - Index of the first command to write
• commands - Commands to write

Panics

Panics if the write would exceed the buffer capacity.

pub fn write(&self, queue: &Queue, commands: &[T])

Write commands to the buffer starting at index 0.

Arguments

• queue - The command queue to use for the write
• commands - Commands to write

Panics

Panics if the write would exceed the buffer capacity.

pub fn clear(&self, queue: &Queue)

Clear the buffer by writing zeros.