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drm/fourcc: Add missing half-float formats

Not something that is likely to be scanned out, but GPUs usually support
half-float formats with 1, 2, or possibly 3 components, and it is useful
to be able to import/export them with a valid fourcc, and/or use gbm to
create them.

These correspond to PIPE_FORMAT_{R16,R16G16,R16G16B16}_FLOAT in mesa.

Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
Acked-by: Simona Vetter <simona@ffwll.ch>
Acked-by: Daniel Stone <daniels@collabora.com>
Link: https://lore.kernel.org/r/20250625173712.116446-2-robin.clark@oss.qualcomm.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>

authored by

Rob Clark and committed by
Dmitry Baryshkov e04c3521 bb8aa27e

+5 -1
+5 -1
include/uapi/drm/drm_fourcc.h
··· 218 218 #define DRM_FORMAT_ABGR16161616 fourcc_code('A', 'B', '4', '8') /* [63:0] A:B:G:R 16:16:16:16 little endian */ 219 219 220 220 /* 221 - * Floating point 64bpp RGB 221 + * Half-Floating point - 16b/component 222 222 * IEEE 754-2008 binary16 half-precision float 223 223 * [15:0] sign:exponent:mantissa 1:5:10 224 224 */ ··· 227 227 228 228 #define DRM_FORMAT_ARGB16161616F fourcc_code('A', 'R', '4', 'H') /* [63:0] A:R:G:B 16:16:16:16 little endian */ 229 229 #define DRM_FORMAT_ABGR16161616F fourcc_code('A', 'B', '4', 'H') /* [63:0] A:B:G:R 16:16:16:16 little endian */ 230 + 231 + #define DRM_FORMAT_R16F fourcc_code('R', ' ', ' ', 'H') /* [15:0] R 16 little endian */ 232 + #define DRM_FORMAT_GR1616F fourcc_code('G', 'R', ' ', 'H') /* [31:0] G:R 16:16 little endian */ 233 + #define DRM_FORMAT_BGR161616F fourcc_code('B', 'G', 'R', 'H') /* [47:0] B:G:R 16:16:16 little endian */ 230 234 231 235 /* 232 236 * RGBA format with 10-bit components packed in 64-bit per pixel, with 6 bits