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open Bigarray
type ('a, 'b) kind = ('a, 'b) Bigarray.kind
exception Unsupported
type u8 = int8_unsigned_elt
type u16 = int16_unsigned_elt
type i32 = int32_elt
type i64 = int64_elt
type f32 = float32_elt
type f64 = float64_elt
type c32 = complex32_elt
type c64 = complex64_elt
let u8 = Int8_unsigned
let u16 = Int16_unsigned
let i32 = Int32
let i64 = Int64
let f32 = Float32
let f64 = Float64
let c32 = Complex32
let c64 = Complex64
module Kind = struct
let[@inline] max : type a b. (a, b) kind -> a = function
| Int8_unsigned ->
255
| Int16_unsigned ->
65535
| Int32 ->
Int32.max_int
| Int64 ->
Int64.max_int
| Float32 ->
1.0
| Float64 ->
1.0
| Complex32 ->
Complex.one
| Complex64 ->
Complex.one
| _ ->
raise Unsupported
let[@inline] min : type a b. (a, b) kind -> a = function
| Int8_unsigned ->
0
| Int16_unsigned ->
0
| Int32 ->
Int32.min_int
| Int64 ->
Int64.min_int
| Float32 ->
0.0
| Float64 ->
0.0
| Complex32 ->
Complex.zero
| Complex64 ->
Complex.zero
| _ ->
raise Unsupported
let[@inline] max_f : type a b. (a, b) kind -> float = function
| Int8_unsigned ->
255.
| Int16_unsigned ->
65535.
| Int32 ->
Int32.max_int |> Int32.to_float
| Int64 ->
Int64.max_int |> Int64.to_float
| Float32 ->
1.0
| Float64 ->
1.0
| Complex32 ->
1.0
| Complex64 ->
1.0
| _ ->
raise Unsupported
let[@inline] min_f : type a b. (a, b) kind -> float = function
| Int8_unsigned ->
0.0
| Int16_unsigned ->
0.0
| Int32 ->
Int32.min_int |> Int32.to_float
| Int64 ->
Int64.min_int |> Int64.to_float
| Float32 ->
0.0
| Float64 ->
0.0
| Complex32 ->
0.0
| Complex64 ->
0.0
| _ ->
raise Unsupported
let[@inline] to_float : type a b. (a, b) kind -> a -> float =
fun kind v ->
match kind with
| Int8_unsigned ->
float_of_int v
| Int16_unsigned ->
float_of_int v
| Int32 ->
Int32.to_float v
| Int64 ->
Int64.to_float v
| Float32 ->
v
| Float64 ->
v
| Complex32 ->
Complex.norm v
| _ ->
raise Unsupported
let[@inline] of_float : type a b. (a, b) kind -> float -> a =
fun kind v ->
match kind with
| Int8_unsigned ->
int_of_float v
| Int16_unsigned ->
int_of_float v
| Int32 ->
Int32.of_float v
| Int64 ->
Int64.of_float v
| Float32 ->
v
| Float64 ->
v
| Complex32 ->
Complex.{re = v; im = 0.}
| _ ->
raise Unsupported
let clamp kind f =
let min = min_f kind in
let max = max_f kind in
if f < min then min else if f > max then max else f
let normalize kind f =
let min = min_f kind in
let max = max_f kind in
(f -. min) /. (max -. min)
let denormalize kind f =
let min = min_f kind in
let max = max_f kind in
f *. (max -. min)
let convert ~from to_kind f =
to_float from f
|> normalize from
|> denormalize to_kind
|> of_float to_kind
end