Function webrender::renderer::upload::copy_from_staging_to_cache

fn copy_from_staging_to_cache(
    renderer: &mut Renderer,
    batch_upload_textures: &[Texture],
    batch_upload_copies: Vec<BatchUploadCopy>,
)

Copy from the staging PBOs or textures to texture cache textures using blit commands.

Using blits instead of draw calls is supposedly more efficient but some drivers have a very high per-command overhead so in some configurations we end up using copy_from_staging_to_cache_using_draw_calls instead.