[vlc-commits] direct3d11: tweak the pixel shader for the Xbox

[Steve Lhomme]

vlc | branch: master | Steve Lhomme <robUx4 at videolabs.io> | Mon Feb  6 15:06:21 2017 +0100| [7422fec75297dc9e83cb88b1a32133b3cddd3645] | committer: Jean-Baptiste Kempf

direct3d11: tweak the pixel shader for the Xbox

although we deliver full range RGB the Xbox assumes it's studio range RGB and
expand the values even more. So we don't apply the studio->full range already
in the pixel shaders.

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

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=7422fec75297dc9e83cb88b1a32133b3cddd3645
---

 modules/video_output/win32/direct3d11.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/modules/video_output/win32/direct3d11.c b/modules/video_output/win32/direct3d11.c
index 90c35e8..7bb12c8 100644
--- a/modules/video_output/win32/direct3d11.c
+++ b/modules/video_output/win32/direct3d11.c
@@ -2038,6 +2038,26 @@ static int AllocQuad(vout_display_t *vd, const video_format_t *fmt, d3d_quad_t *
                 ppColorspace = COLORSPACE_BT601_TO_FULL;
             break;
     }
+
+#if VLC_WINSTORE_APP
+    if (isXboxHardware(sys->d3ddevice)) {
+        static const FLOAT FULL_TO_STUDIO_RATIO = (256.f - 16.f - 20.f) / 256.f;
+        /* limit to 16-235 range as it's expanded again by the hardware */
+        WHITE_POINT_D65_TO_FULL[0] += FULL_TO_STUDIO_SHIFT;
+        if (RGB_shader) {
+            WHITE_POINT_D65_TO_FULL[1] += FULL_TO_STUDIO_SHIFT;
+            WHITE_POINT_D65_TO_FULL[2] += FULL_TO_STUDIO_SHIFT;
+            ppColorspace[0 * 5] *= FULL_TO_STUDIO_RATIO;
+            ppColorspace[1 * 5] *= FULL_TO_STUDIO_RATIO;
+            ppColorspace[2 * 5] *= FULL_TO_STUDIO_RATIO;
+        } else {
+            ppColorspace[0 * 4] *= FULL_TO_STUDIO_RATIO;
+            ppColorspace[1 * 4] *= FULL_TO_STUDIO_RATIO;
+            ppColorspace[2 * 4] *= FULL_TO_STUDIO_RATIO;
+        }
+    }
+#endif
+
     memcpy(colorspace.Colorspace, ppColorspace, sizeof(colorspace.Colorspace));
     memcpy(colorspace.WhitePoint, WHITE_POINT_D65_TO_FULL, sizeof(colorspace.WhitePoint));
     constantInit.pSysMem = &colorspace;