vo_opengl: fix gray playback

Commit f24ba544 wasn't an equivalent change.

(This shit needs some sort of automated tests.)

1 files changed, 3 insertions, 4 deletions

diff --git a/video/csputils.c b/video/csputils.c
index 479c411322..08c484ffda 100644
--- a/video/csputils.c
+++ b/video/csputils.c
@@ -655,13 +655,12 @@ void mp_get_csp_matrix(struct mp_csp_params *params, struct mp_cmat *m)
     };
 
     if ((colorspace == MP_CSP_BT_601 || colorspace == MP_CSP_BT_709 ||
-         colorspace == MP_CSP_SMPTE_240M || colorspace == MP_CSP_BT_2020_NC)
-        && !params->gray)
+         colorspace == MP_CSP_SMPTE_240M || colorspace == MP_CSP_BT_2020_NC))
     {
         // Hue is equivalent to rotating input [U, V] subvector around the origin.
         // Saturation scales [U, V].
-        float huecos = params->saturation * cos(params->hue);
-        float huesin = params->saturation * sin(params->hue);
+        float huecos = params->gray ? 0 : params->saturation * cos(params->hue);
+        float huesin = params->gray ? 0 : params->saturation * sin(params->hue);
         for (int i = 0; i < 3; i++) {
             float u = m->m[i][1], v = m->m[i][2];
             m->m[i][1] = huecos * u - huesin * v;