Function lerp

tools/bloom-reference/src/main.rs:372–374

(a: f32, b: f32, t: f32)

}

fn lerp(a: f32, b: f32, t: f32) -> f32 {
    a + (b - a) * t
}

/// Shared bilinear coord computation so every texture sampler does
/// the same wrapping and interpolation math.