const MD2_MATH_CONSTANTS: &str = r#"
const M_PI: f32 = 3.14159265358979;
const M_PI_2: f32 = 1.57079632679489;
const M_INV_PI: f32 = 0.31830988618379;
const M_INV_PI_2: f32 = 0.15915494309189;
"#;Expand description
MD2 math constants (mirrors projectM’s milkdrop-shaders.h).
User shaders reference these by short bare names. M_PI_2 (11 hits) and
M_INV_PI_2 (8 hits) are the most common in the 200-preset survey;
M_PI and M_INV_PI are added for completeness — they cost nothing.