X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fvector.h;fp=source%2Fvector.h;h=25ebac1180c8fc1cc5dc531f0616e3eefe915589;hp=d1693af101ab04c5806038b247264302704e5295;hb=705986ebcdd24573791aa58c7a8f2b7549c918a3;hpb=aceaa08be594ac708efcd0b68e5d08547cbcbbe1

diff --git a/source/vector.h b/source/vector.h
index d1693af1..25ebac11 100644
--- a/source/vector.h
+++ b/source/vector.h
@@ -11,12 +11,15 @@ Distributed under the LGPL
 namespace Msp {
 namespace GL {
 
+struct Vector4;
+
 struct Vector3
 {
 	float x, y, z;
 
 	Vector3(): x(0), y(0), z(0) { }
 	Vector3(float x_, float y_, float z_): x(x_), y(y_), z(z_) { }
+	Vector3(const Vector4 &);
 };
 
 struct Vector4
@@ -29,6 +32,10 @@ struct Vector4
 	Vector4(const Vector3 &v): x(v.x), y(v.y), z(v.z), w(1) { }
 };
 
+inline Vector3::Vector3(const Vector4 &v):
+	x(v.x/v.w), y(v.y/v.w), z(v.z/v.w)
+{ }
+
 } // namespace GL
 } // namespace Msp