One pass, two truths.

A native WebGL2 WebGLRenderTarget with two color attachments receives color and normal data from one GLSL3 draw. The preview and indexed readback keep the attachments observable.

target

—

attachments

—

pixel 0 / 1

—

sample avg / p95

—

draw calls

—

exposure

—

Allocating two color attachments…

This route covers native WebGL2 multiple color attachments and indexed readback. It does not claim the WebGPU MRT graph, exact official scene/assets/pixels, MSAA resolve behavior, device attachment limits, or whole-example fidelity.

Color attachment 0 is the shaded surface; color attachment 1 is the encoded view-space normal.