40 lines
1.2 KiB
Zig
40 lines
1.2 KiB
Zig
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const std = @import("std");
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pub fn add(a: anytype, b: anytype) ?@TypeOf(a + b) {
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const result, const overflow = @addWithOverflow(a, b);
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return if (overflow == 0) result else null;
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}
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pub fn fractional(value: anytype, fraction: anytype) ?@TypeOf(value) {
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if (fraction < 0 or fraction > 1) {
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return null;
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}
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const Fraction = @TypeOf(fraction);
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return switch (@typeInfo(Fraction)) {
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.Float => @intFromFloat(@as(Fraction, @floatFromInt(value)) * fraction),
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else => @compileError("`fraction` expected float type, not " ++ @typeName(Fraction)),
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};
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}
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pub fn lerp_angle(origin_angle: anytype, target_angle: anytype, weight: anytype) @TypeOf(origin_angle, target_angle, weight) {
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const angle_difference = @mod(target_angle - origin_angle, std.math.tau);
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const distance = @mod(2.0 * angle_difference, std.math.tau) - angle_difference;
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return origin_angle + distance * weight;
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}
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pub fn mul(a: anytype, b: anytype) ?@TypeOf(a * b) {
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const result, const overflow = @mulWithOverflow(a, b);
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return if (overflow == 0) result else null;
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}
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pub fn sub(a: anytype, b: anytype) ?@TypeOf(a - b) {
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const result, const overflow = @subWithOverflow(a, b);
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return if (overflow == 0) result else null;
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}
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