From 8fdc55c03fb7324d784b76d426eb779e5612e684 Mon Sep 17 00:00:00 2001
From: Daniel Stone <daniels@collabora.com>
Date: Fri, 1 Nov 2024 14:02:36 +0000
Subject: [PATCH] pixel-formats: Add NV15/20/30 YUV 10bpc formats

NV15/20/30 are a family of 10bpc YUV formats which have 4
horizontally-adjacent samples packed into a 40-bit cluster. The
difference between 15/20/30 is in the subsampling.

No fallbacks are provided, as there is no format pairing which would
allow us to sensibly unpack the clusters.

Signed-off-by: Daniel Stone <daniels@collabora.com>
---
 libweston/pixel-formats.c  | 21 +++++++++++++++++++++
 shared/weston-drm-fourcc.h |  9 +++++++++
 2 files changed, 30 insertions(+)

diff --git a/libweston/pixel-formats.c b/libweston/pixel-formats.c
index 09cae16f3..f432854f4 100644
--- a/libweston/pixel-formats.c
+++ b/libweston/pixel-formats.c
@@ -495,6 +495,27 @@ static const struct pixel_format_info pixel_format_table[] = {
 		.hsub = 2,
 		.vsub = 2,
 	},
+	{
+		DRM_FORMAT(NV15),
+		SAMPLER_TYPE(EGL_TEXTURE_Y_UV_WL),
+		.num_planes = 2,
+		.hsub = 2,
+		.vsub = 2,
+	},
+	{
+		DRM_FORMAT(NV20),
+		SAMPLER_TYPE(EGL_TEXTURE_Y_UV_WL),
+		.num_planes = 2,
+		.hsub = 2,
+		.vsub = 1,
+	},
+	{
+		DRM_FORMAT(NV30),
+		SAMPLER_TYPE(EGL_TEXTURE_Y_UV_WL),
+		.num_planes = 2,
+		.hsub = 1,
+		.vsub = 1,
+	},
 	{
 		DRM_FORMAT(NV21),
 		SAMPLER_TYPE(EGL_TEXTURE_Y_UV_WL),
diff --git a/shared/weston-drm-fourcc.h b/shared/weston-drm-fourcc.h
index 0a013f791..d9a66c34b 100644
--- a/shared/weston-drm-fourcc.h
+++ b/shared/weston-drm-fourcc.h
@@ -46,4 +46,13 @@
 #define DRM_FORMAT_ABGR16161616  fourcc_code('A', 'B', '4', '8') /* [63:0] A:B:G:R 16:16:16:16 little endian */
 #endif
 
+/*
+ * 2 plane YCbCr
+ * index 0 = Y plane, [39:0] Y3:Y2:Y1:Y0 little endian
+ * index 1 = Cr:Cb plane, [39:0] Cr1:Cb1:Cr0:Cb0 little endian
+ */
+#define DRM_FORMAT_NV15		fourcc_code('N', 'V', '1', '5') /* 2x2 subsampled Cr:Cb plane */
+#define DRM_FORMAT_NV20		fourcc_code('N', 'V', '2', '0') /* 2x1 subsampled Cr:Cb plane */
+#define DRM_FORMAT_NV30		fourcc_code('N', 'V', '3', '0') /* non-subsampled Cr:Cb plane */
+
 #endif