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charset="utf-8" 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 --- include/uapi/drm/drm_fourcc.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h index e41a3cec6a9e..3560ca1ffb8b 100644 --- a/include/uapi/drm/drm_fourcc.h +++ b/include/uapi/drm/drm_fourcc.h @@ -218,7 +218,7 @@ extern "C" { #define DRM_FORMAT_ABGR16161616 fourcc_code('A', 'B', '4', '8') /* [63:0] = A:B:G:R 16:16:16:16 little endian */ =20 /* - * Floating point 64bpp RGB + * Half-Floating point - 16b/component * IEEE 754-2008 binary16 half-precision float * [15:0] sign:exponent:mantissa 1:5:10 */ @@ -228,6 +228,10 @@ extern "C" { #define DRM_FORMAT_ARGB16161616F fourcc_code('A', 'R', '4', 'H') /* [63:0]= A:R:G:B 16:16:16:16 little endian */ #define DRM_FORMAT_ABGR16161616F fourcc_code('A', 'B', '4', 'H') /* [63:0]= A:B:G:R 16:16:16:16 little endian */ =20 +#define DRM_FORMAT_R16F fourcc_code('R', ' ', ' ', 'H') /* [15:0]= R 16 little endian */ +#define DRM_FORMAT_GR1616F fourcc_code('G', 'R', ' ', 'H') /* [31:0]= G:R 16:16 little endian */ +#define DRM_FORMAT_BGR161616F fourcc_code('B', 'G', 'R', 'H') /* [47:0]= B:G:R 16:16:16 little endian */ + /* * RGBA format with 10-bit components packed in 64-bit per pixel, with 6 b= its * of unused padding per component: --=20 2.49.0 From nobody Thu Oct 9 02:55:51 2025 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7C4FC28E579 for ; 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charset="utf-8" Add 1, 2, 3, and 4 component 32b float formats, so that buffers with these formats can be imported/exported with fourcc+modifier, and/or created by gbm. These correspond to PIPE_FORMAT_{R32,R32G32,R32G32B32,R32G32B32A32}_FLOAT in mesa. Signed-off-by: Rob Clark --- include/uapi/drm/drm_fourcc.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h index 3560ca1ffb8b..abf47dfcedc3 100644 --- a/include/uapi/drm/drm_fourcc.h +++ b/include/uapi/drm/drm_fourcc.h @@ -232,6 +232,16 @@ extern "C" { #define DRM_FORMAT_GR1616F fourcc_code('G', 'R', ' ', 'H') /* [31:0]= G:R 16:16 little endian */ #define DRM_FORMAT_BGR161616F fourcc_code('B', 'G', 'R', 'H') /* [47:0]= B:G:R 16:16:16 little endian */ =20 +/* + * Floating point - 32b/component + * IEEE 754-2008 binary32 float + * [15:0] sign:exponent:mantissa 1:8:23 + */ +#define DRM_FORMAT_R32F fourcc_code('R', ' ', ' ', 'F') /* [31:0]= R 32 little endian */ +#define DRM_FORMAT_GR3232F fourcc_code('G', 'R', ' ', 'F') /* [63:0]= R:G 32:32 little endian */ +#define DRM_FORMAT_BGR323232F fourcc_code('B', 'G', 'R', 'F') /* [95:0]= R:G:B 32:32:32 little endian */ +#define DRM_FORMAT_ABGR32323232F fourcc_code('A', 'B', '8', 'F') /* [127:0= ] R:G:B:A 32:32:32:32 little endian */ + /* * RGBA format with 10-bit components packed in 64-bit per pixel, with 6 b= its * of unused padding per component: --=20 2.49.0