Function input_matches_write

native/shared/src/renderer/graph.rs:252–264

A read-of-output match: SceneColor reads from HdrColor, SceneDepth reads from Depth, etc. The synthetic copy-to-sample node that Phase 2b introduces is the one that actually produces the sampled snapshot; for scheduling purposes we treat them as the same resource.

(input: &PassInput, output: &PassOutput)

/// the sampled snapshot; for scheduling purposes we treat them as
/// the same resource.
fn input_matches_write(input: &PassInput, output: &PassOutput) -> bool {
    match (input, output) {
        (PassInput::SceneColor,       PassOutput::HdrColor)    => true,
        (PassInput::SceneDepth,       PassOutput::Depth)       => true,
        (PassInput::Shadow(i),        PassOutput::Shadow(j))   => i == j,
        (PassInput::Transient(i),     PassOutput::Transient(j)) => i == j,
        // EnvCubemap, MotionVectors, Impulse are produced outside
        // the render graph for now (env is loaded at startup; motion
        // vectors are written as a G-buffer target but not individually
        // tracked). No-op match.
        _ => false,
    }
}

// =====================================================================
// Tests