ona/source/coral/math.zig

pub const CheckedArithmeticError = error {
	IntOverflow,
};

pub fn Float(comptime bits: comptime_int) type {
	return @Type(.{.Float = .{.bits = bits}});
}

pub fn Signed(comptime bits: comptime_int) type {
	return @Type(.{.Int = .{
		.signedness = .signed,
		.bits = bits,
	}});
}

pub fn Unsigned(comptime bits: comptime_int) type {
	return @Type(.{.Int = .{
		.signedness = .unsigned,
		.bits = bits,
	}});
}

pub const Vector2 = extern struct {
	x: f32,
	y: f32,

	pub const zero = Vector2{.x = 0, .y = 0};
};

pub fn checked_add(a: anytype, b: anytype) CheckedArithmeticError!@TypeOf(a + b) {
	const result = @addWithOverflow(a, b);

	if (result.@"1" != 0) return error.IntOverflow;

	return result.@"0";
}

pub fn checked_mul(a: anytype, b: anytype) CheckedArithmeticError!@TypeOf(a * b) {
	const result = @mulWithOverflow(a, b);

	if (result.@"1" != 0) return error.IntOverflow;

	return result.@"0";
}

pub fn checked_sub(a: anytype, b: anytype) CheckedArithmeticError!@TypeOf(a - b) {
	const result = @subWithOverflow(a, b);

	if (result.@"1" != 0) return error.IntOverflow;

	return result.@"0";
}

pub fn clamp(comptime Scalar: type, value: Scalar, min_value: Scalar, max_value: Scalar) Scalar {
	return max(Scalar, min_value, min(Scalar, max_value, value));
}

pub fn max(comptime Scalar: type, this: Scalar, that: Scalar) Scalar {
	return if (this > that) this else that;
}

pub fn max_int(comptime Int: type) Int {
	const info = @typeInfo(Int);
	const bit_count = info.Int.bits;

	if (bit_count == 0) return 0;

	return (1 << (bit_count - @boolToInt(info.Int.signedness == .signed))) - 1;
}

pub fn min(comptime Scalar: type, this: Scalar, that: Scalar) Scalar {
	return if (this < that) this else that;
}