improved TraceLine in chase.c to be more generally useful (should move it to another...

[xonotic/darkplaces.git] / transform.c

diff --git a/transform.c b/transform.c
index b8db4c359e3f52b9e9d8ca5cb52a2167e72193cd..e025c7f3ea5f1ef5ceadfd124f78a6af69af3ad0 100644 (file)
--- a/transform.c
+++ b/transform.c
@@ -68,6 +68,18 @@ void softwaretransform_docopy (vec3_t in, vec3_t out)
        out[2] = in[2];
 }
 
+void softwareuntransform (vec3_t in, vec3_t out)
+{
+       vec3_t v;
+       float s = 1.0f / softwaretransform_scale;
+       v[0] = in[0] - softwaretransform_offset[0];
+       v[1] = in[1] - softwaretransform_offset[1];
+       v[2] = in[2] - softwaretransform_offset[2];
+       out[0] = (v[0] * softwaretransform_x[0] + v[1] * softwaretransform_x[1] + v[2] * softwaretransform_x[2]) * s;
+       out[1] = (v[0] * softwaretransform_y[0] + v[1] * softwaretransform_y[1] + v[2] * softwaretransform_y[2]) * s;
+       out[2] = (v[0] * softwaretransform_z[0] + v[1] * softwaretransform_z[1] + v[2] * softwaretransform_z[2]) * s;
+}
+
 // to save time on transforms, choose the appropriate function
 void softwaretransform_classify()
 {