direct3d11: only change the pixel shader if the first output texture is DXGI_FORMAT_R8_UNORM

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/video_output/msw/direct3d11.c

@@ -1095,6 +1095,9 @@ static int Direct3D11Open(vout_display_t *vd, video_format_t *fmt)
         sys->d3dregion_format = DXGI_FORMAT_UNKNOWN;
     }
 
+    sys->d3dPxShader = globPixelShaderDefault;
+    if (sys->picQuadConfig.resourceFormatYRGB == DXGI_FORMAT_R8_UNORM)
+    {
         switch (fmt->i_chroma)
         {
         case VLC_CODEC_NV12:
@@ -1111,13 +1114,12 @@ static int Direct3D11Open(vout_display_t *vd, video_format_t *fmt)
             else
                 sys->d3dPxShader = globPixelShaderBiplanarI420_BT601_2RGB;
             break;
-    case VLC_CODEC_RGB32:
-    case VLC_CODEC_BGRA:
-    case VLC_CODEC_RGB16:
         default:
-        sys->d3dPxShader = globPixelShaderDefault;
+            vlc_assert_unreachable();
             break;
         }
+    }
+
     if (sys->d3dregion_format != DXGI_FORMAT_UNKNOWN)
         sys->psz_rgbaPxShader = globPixelShaderDefault;
     else