Adding upstream version 0.0~git20250520.a1d9079+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

exp/f32/vec4.go

@@ -0,0 +1,47 @@
+// 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]
+}