module

Opal::Shader::FastMath

High-performance mathematical helpers and trigonometric lookup tables (LUT) for real-time text fragment shaders.

Constants

HALF_PI = Math::PI / 2.0

INV_TWO_PI = 1.0 / TWO_PI

SIN_TABLE = Slice(Float64).new(TABLE_SIZE) do |i| Math.sin((i.to_f * TWO_PI) / TABLE_SIZE.to_f) end

Precomputed sine lookup table

TABLE_MASK = 1023

TABLE_SCALE = 1024.0

TABLE_SIZE = 1024

TWO_PI = Math::PI * 2.0

cos(angle : Float64) : Float64

Constant-time cosine approximation via lookup table

sin(angle : Float64) : Float64

Constant-time sine approximation via lookup table without fmod or division