tiny.linear.Vec4

1pub const Vec4 = extern struct {2    x: f32 = 0,3    y: f32 = 0,4    z: f32 = 0,5    w: f32 = 0,67    pub const zero: Vec4 = .{};89    pub fn init(x: f32, y: f32, z: f32, w: f32) Vec4 {10        return .{ .x = x, .y = y, .z = z, .w = w };11    }1213    pub fn splat(value: f32) Vec4 {14        return .{ .x = value, .y = value, .z = value, .w = value };15    }1617    /// A homogeneous vector: `w = 1` for a point, `w = 0` for a direction.18    pub fn fromVec3(v: Vec3, w: f32) Vec4 {19        return .{ .x = v.x, .y = v.y, .z = v.z, .w = w };20    }2122    pub fn fromArray(lanes: [4]f32) Vec4 {23        return .{ .x = lanes[0], .y = lanes[1], .z = lanes[2], .w = lanes[3] };24    }2526    pub fn toArray(v: Vec4) [4]f32 {27        return .{ v.x, v.y, v.z, v.w };28    }2930    pub fn xyz(v: Vec4) Vec3 {31        return .{ .x = v.x, .y = v.y, .z = v.z };32    }3334    pub fn add(a: Vec4, b: Vec4) Vec4 {35        return .{ .x = a.x + b.x, .y = a.y + b.y, .z = a.z + b.z, .w = a.w + b.w };36    }3738    pub fn sub(a: Vec4, b: Vec4) Vec4 {39        return .{ .x = a.x - b.x, .y = a.y - b.y, .z = a.z - b.z, .w = a.w - b.w };40    }4142    /// Lane-wise product.43    pub fn mul(a: Vec4, b: Vec4) Vec4 {44        return .{ .x = a.x * b.x, .y = a.y * b.y, .z = a.z * b.z, .w = a.w * b.w };45    }4647    pub fn scale(v: Vec4, s: f32) Vec4 {48        return .{ .x = v.x * s, .y = v.y * s, .z = v.z * s, .w = v.w * s };49    }5051    pub fn negate(v: Vec4) Vec4 {52        return .{ .x = -v.x, .y = -v.y, .z = -v.z, .w = -v.w };53    }5455    pub fn dot(a: Vec4, b: Vec4) f32 {56        return a.x * b.x + a.y * b.y + a.z * b.z + a.w * b.w;57    }5859    pub fn lengthSq(v: Vec4) f32 {60        return v.dot(v);61    }6263    pub fn length(v: Vec4) f32 {64        return @sqrt(v.lengthSq());65    }6667    /// The unit vector along `v`, or null when its length is at most68    /// `min_length` or is NaN.69    pub fn normalized(v: Vec4, min_length: f32) ?Vec4 {70        assert(min_length >= 0);71        const len = v.length();72        if (!(len > min_length)) return null;73        return v.scale(1 / len);74    }7576    /// `a` at `t = 0` and `b` at `t = 1`.77    pub fn lerp(a: Vec4, b: Vec4, t: f32) Vec4 {78        return a.add(b.sub(a).scale(t));79    }8081    pub fn min(a: Vec4, b: Vec4) Vec4 {82        return .{ .x = @min(a.x, b.x), .y = @min(a.y, b.y), .z = @min(a.z, b.z), .w = @min(a.w, b.w) };83    }8485    pub fn max(a: Vec4, b: Vec4) Vec4 {86        return .{ .x = @max(a.x, b.x), .y = @max(a.y, b.y), .z = @max(a.z, b.z), .w = @max(a.w, b.w) };87    }8889    pub fn abs(v: Vec4) Vec4 {90        return .{ .x = @abs(v.x), .y = @abs(v.y), .z = @abs(v.z), .w = @abs(v.w) };91    }92};

1pub const Vec4 = vector.Vec4;