| // Copyright 2014 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package f32 |
| |
| import "fmt" |
| |
| type Vec4 [4]float32 |
| |
| func (v Vec4) String() string { |
| return fmt.Sprintf("Vec4[% 0.3f, % 0.3f, % 0.3f, % 0.3f]", v[0], v[1], v[2], v[3]) |
| } |
| |
| func (v *Vec4) Normalize() { |
| sq := v.Dot(v) |
| inv := 1 / Sqrt(sq) |
| v[0] *= inv |
| v[1] *= inv |
| v[2] *= inv |
| v[3] *= inv |
| } |
| |
| func (v *Vec4) Sub(v0, v1 *Vec4) { |
| v[0] = v0[0] - v1[0] |
| v[1] = v0[1] - v1[1] |
| v[2] = v0[2] - v1[2] |
| v[3] = v0[3] - v1[3] |
| } |
| |
| func (v *Vec4) Add(v0, v1 *Vec4) { |
| v[0] = v0[0] + v1[0] |
| v[1] = v0[1] + v1[1] |
| v[2] = v0[2] + v1[2] |
| v[3] = v0[3] + v1[3] |
| } |
| |
| func (v *Vec4) Mul(v0, v1 *Vec4) { |
| v[0] = v0[0] * v1[0] |
| v[1] = v0[1] * v1[1] |
| v[2] = v0[2] * v1[2] |
| v[3] = v0[3] * v1[3] |
| } |
| |
| func (v *Vec4) Dot(v1 *Vec4) float32 { |
| return v[0]*v1[0] + v[1]*v1[1] + v[2]*v1[2] + v[3]*v1[3] |
| } |