Struct TransferFunctionLut 

pub struct TransferFunctionLut { /* private fields */ }

A baked 1D RGBA lookup table suitable for GPU upload.

Produced by TransferFunctionLut::bake from a ColorTransferFunction and an OpacityTransferFunction.

The table maps a normalised scalar t ∈ [0, 1] (where 0 = scalar_min, 1 = scalar_max) to an RGBA value in [0, 1].

GPU Upload

Call TransferFunctionLut::as_rgba_f32 to obtain the raw data, then upload as a 1D R32G32B32A32Float texture.

Implementations

impl TransferFunctionLut

pub fn bake( ctf: &ColorTransferFunction, otf: &OpacityTransferFunction, scalar_min: f64, scalar_max: f64, lut_size: u32, ) -> Self

Bake a LUT from a colour and opacity transfer function.

scalar_min/scalar_max define the mapping range; lut_size is the number of texture texels (256 is typical).

Panics (debug only)

Panics if lut_size == 0 or scalar_min >= scalar_max.

pub fn as_rgba_f32(&self) -> &[f32]

Raw RGBA f32 slice, suitable for GPU texture upload.

Length = lut_size * 4.

pub fn as_bytes(&self) -> &[u8]

Raw bytes, suitable for wgpu::Queue::write_texture.

pub fn lut_size(&self) -> u32

Number of texels in the LUT.

pub fn scalar_min(&self) -> f64

Scalar value at t = 0.

pub fn scalar_max(&self) -> f64

Scalar value at t = 1.

Trait Implementations

impl Clone for TransferFunctionLut

fn clone(&self) -> TransferFunctionLut

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TransferFunctionLut

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.