'auto' — use the backbuffer when one is registered; otherwise
fall back to creating a transient texture. The caller is
responsible for choosing loadOp ('clear' if this pass
is the first writer, 'load' if a previous pass already
cleared/wrote to the same backbuffer).
undefined — always create a transient texture (HDR rgba16float for
color, depth32float for depth). This is the legacy default.
How a ForwardPass attachment slot is sourced.
ResourceHandle— write into the supplied handle (caller provides the texture).'backbuffer'— write into the graph's registered backbuffer / backbuffer depth. Requires RenderGraph.setBackbuffer (and, for depth, RenderGraph.setBackbufferDepth) to have been called.'auto'— use the backbuffer when one is registered; otherwise fall back to creating a transient texture. The caller is responsible for choosingloadOp('clear' if this pass is the first writer, 'load' if a previous pass already cleared/wrote to the same backbuffer).undefined— always create a transient texture (HDRrgba16floatfor color,depth32floatfor depth). This is the legacy default.