Function scale_buffer

examples/cuda/gpu/path_tracer_gpu/src/render_kernels.rs:25–37

(fb: *const Vec3, out: *mut Vec3, samples: u32, view: Viewport)

/// Scales an accumulated buffer by the sample count, storing each pixel in the corresponding `out` pixel.
#[kernel]
pub unsafe fn scale_buffer(fb: *const Vec3, out: *mut Vec3, samples: u32, view: Viewport) {
    let idx_2d = thread::index_2d();
    if idx_2d.x >= view.bounds.x as u32 || idx_2d.y >= view.bounds.y as u32 {
        return;
    }
    let idx = idx_2d.y as usize * view.bounds.x + idx_2d.x as usize;
    let original = &*fb.add(idx);
    let out = &mut *out.add(idx);

    let scale = 1.0 / samples as f32;
    let scaled = original * scale;
    *out = scaled;
}

/// Postprocesses a (scaled) buffer into a final u8 buffer.
#[kernel]