X-Git-Url: https://de.git.xonotic.org/?p=xonotic%2Fnetradiant.git;a=blobdiff_plain;f=libs%2Fmathlib.h;h=c2e2ed7589835a08ac4b750a4aa1c552449a4229;hp=bbf026d452e6c5825b463bcc3ed73b72c1b1d9b2;hb=be4e243888ed01b2e82a31deb9b8ff255c5a87ba;hpb=d909e5b8c7b4ccf8a7a0fea6e77e49d021398bb3

diff --git a/libs/mathlib.h b/libs/mathlib.h
index bbf026d4..c2e2ed75 100644
--- a/libs/mathlib.h
+++ b/libs/mathlib.h
@@ -77,6 +77,8 @@ extern const vec3_t g_vec3_axis_z;
 #define FLOAT_SNAP(f,snap) ( (float)( floor( (f) / (snap) + 0.5 ) * (snap) ) )
 #define FLOAT_TO_INTEGER(f) ( (float)( floor( (f) + 0.5 ) ) )
 
+#define RGBTOGRAY(x) ( (x)[0] * 0.2989f + (x)[1] * 0.5870f + (x)[2] * 0.1140f )
+
 #define Q_rint(in) ((vec_t)floor(in+0.5))
 
 qboolean VectorCompare (const vec3_t v1, const vec3_t v2);