Struct Permutation

pub struct Permutation { /* private fields */ }

The permutation of a buffer containing vertex attribute data. The Permutation maps the layout of an input buffer’s fields to the input registers used in the picasso shader.

Implementations

impl Permutation

pub fn from_layout(layout: &[Register]) -> Result<Self, Error>

Construct the permutation for a buffer whos fields (in order) correspond to the provided list of input registers (as used in the picasso shader).

Example

Picasso

; Inputs (defined as aliases for convenience)
.alias inpos         v0 ; fvec3
.alias innorm        v1 ; fvec3
.alias intex         v2 ; fvec2

Rust

struct Vertex {
    pos: [f32; 3],
    tex: [f32; 2],
}

impl Vertex {
    pub fn permutation() -> Permutation {
        Permutation::from_layout(&[Register::V0, Register::V2]).unwrap()
    }
}

struct Normal {
    norm: [f32; 3],
}

impl Normal {
    pub fn permutation() -> Permutation {
        Permutation::from_layout(&[Register::V1]).unwrap()
    }
}

Errors

• If more than 16 attribute registers are provided (i.e. layout.len() > 16)

Trait Implementations

impl Clone for Permutation

fn clone(&self) -> Permutation

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Permutation

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

Formats the value using the given formatter.

impl Copy for Permutation