Function bevy_render::batching::batch_and_prepare_render_phase

pub fn batch_and_prepare_render_phase<I: CachedRenderPipelinePhaseItem, F: GetBatchData>(
    gpu_array_buffer: ResMut<'_, GpuArrayBuffer<F::BufferData>>,
    views: Query<'_, '_, &mut RenderPhase<I>>,
    param: StaticSystemParam<'_, '_, F::Param>
)

Batch the items in a render phase. This means comparing metadata needed to draw each phase item and trying to combine the draws into a batch.