Type Alias EffectDrawOpts

Blend mode override. Default: "premultiplied" when drawing to
the canvas (target null/omitted), "none" when drawing to a
user-allocated render target. Use "additive" for accumulating
draws like sparkles or particle stamps.

Default: ctx.quad.

Whether to advance the persistent RT's read/write buffers after
this draw. Default: true.

Set to false when you need to write to the same physical buffer
across multiple draws in one frame — e.g. a full-screen pass that
fills every texel followed by a sparse pass that surgically
overwrites a few. Without swap: false, the second draw would
land in the other (stale) buffer of the ping-pong pair and the
first draw's output would be lost.

No-op for non-persistent RTs and for canvas writes.

Render target of the effect.
It renders to the Canvas if omitted (or null).