X-Git-Url: http://git.xonotic.org/?a=blobdiff_plain;f=matrixlib.c;h=911f9ace0de4fbc3c59de2ae1fbfab0e072bf1ee;hb=3356797550466b320ca897b33e6972ac6d15cefc;hp=78c859cfed39673b9e6f7f6628ca8dae90c91e50;hpb=9d6f4496fec74ad0fe7c794666138b6495dc9405;p=xonotic%2Fdarkplaces.git

diff --git a/matrixlib.c b/matrixlib.c
index 78c859cf..911f9ace 100644
--- a/matrixlib.c
+++ b/matrixlib.c
@@ -890,6 +890,54 @@ void Matrix4x4_CreateFromQuakeEntity(matrix4x4_t *out, double x, double y, doubl
 	}
 }
 
+void Matrix4x4_QuakeToDuke3D(const matrix4x4_t *in, matrix4x4_t *out, double maxShearAngle)
+{
+	// Sorry - this isn't direct at all. We can't just use an alternative to
+	// Matrix4x4_CreateFromQuakeEntity as in some cases the input for
+	// generating the view matrix is generated externally.
+	vec3_t forward, left, up, angles;
+	double scaleforward, scaleleft, scaleup;
+#ifdef MATRIX4x4_OPENGLORIENTATION
+	VectorSet(forward, in->m[0][0], in->m[0][1], in->m[0][2]);
+	VectorSet(left, in->m[1][0], in->m[1][1], in->m[1][2]);
+	VectorSet(up, in->m[2][0], in->m[2][1], in->m[2][2]);
+#else
+	VectorSet(forward, in->m[0][0], in->m[1][0], in->m[2][0]);
+	VectorSet(left, in->m[0][1], in->m[1][1], in->m[2][1]);
+	VectorSet(up, in->m[0][2], in->m[1][2], in->m[2][2]);
+#endif
+	scaleforward = VectorNormalizeLength(forward);
+	scaleleft = VectorNormalizeLength(left);
+	scaleup = VectorNormalizeLength(up);
+	AnglesFromVectors(angles, forward, up, false);
+	AngleVectorsDuke3DFLU(angles, forward, left, up, maxShearAngle);
+	VectorScale(forward, scaleforward, forward);
+	VectorScale(left, scaleleft, left);
+	VectorScale(up, scaleup, up);
+	*out = *in;
+#ifdef MATRIX4x4_OPENGLORIENTATION
+	out->m[0][0] = forward[0];
+	out->m[1][0] = left[0];
+	out->m[2][0] = up[0];
+	out->m[0][1] = forward[1];
+	out->m[1][1] = left[1];
+	out->m[2][1] = up[1];
+	out->m[0][2] = forward[2];
+	out->m[1][2] = left[2];
+	out->m[2][2] = up[2];
+#else
+	out->m[0][0] = forward[0];
+	out->m[0][1] = left[0];
+	out->m[0][2] = up[0];
+	out->m[1][0] = forward[1];
+	out->m[1][1] = left[1];
+	out->m[1][2] = up[1];
+	out->m[2][0] = forward[2];
+	out->m[2][1] = left[2];
+	out->m[2][2] = up[2];
+#endif
+}
+
 void Matrix4x4_ToVectors(const matrix4x4_t *in, float vx[3], float vy[3], float vz[3], float t[3])
 {
 #ifdef MATRIX4x4_OPENGLORIENTATION