[Mesa-dev] [RFC 6/6] gbm: Add visuals and buffer handling for fp16 formats

Kevin Strasser kevin.strasser at intel.com
Fri Jan 4 21:56:32 UTC 2019


Set loader caps indicating that gbm can handle both rgba ordering and
fp16 formats.

Signed-off-by: Kevin Strasser <kevin.strasser at intel.com>
---
 src/gbm/backends/dri/gbm_dri.c | 26 +++++++++++++++++++++++++-
 src/gbm/main/gbm.c             |  3 +++
 src/gbm/main/gbm.h             |  9 +++++++++
 3 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/src/gbm/backends/dri/gbm_dri.c b/src/gbm/backends/dri/gbm_dri.c
index 225b0de..cc1943e 100644
--- a/src/gbm/backends/dri/gbm_dri.c
+++ b/src/gbm/backends/dri/gbm_dri.c
@@ -118,6 +118,19 @@ dri_get_buffers_with_format(__DRIdrawable * driDrawable,
                                    count, out_count, surf->dri_private);
 }
 
+static unsigned
+dri_get_capability(void *loaderPrivate, enum dri_loader_cap cap)
+{
+   /* Note: loaderPrivate is _EGLDisplay* */
+   switch (cap) {
+   case DRI_LOADER_CAP_RGBA_ORDERING:
+   case DRI_LOADER_CAP_FP16:
+      return 1;
+   default:
+      return 0;
+   }
+}
+
 static int
 image_get_buffers(__DRIdrawable *driDrawable,
                   unsigned int format,
@@ -215,11 +228,12 @@ static const __DRIimageLookupExtension image_lookup_extension = {
 };
 
 static const __DRIdri2LoaderExtension dri2_loader_extension = {
-   .base = { __DRI_DRI2_LOADER, 3 },
+   .base = { __DRI_DRI2_LOADER, 4 },
 
    .getBuffers              = dri_get_buffers,
    .flushFrontBuffer        = dri_flush_front_buffer,
    .getBuffersWithFormat    = dri_get_buffers_with_format,
+   .getCapability           = dri_get_capability,
 };
 
 static const __DRIimageLoaderExtension image_loader_extension = {
@@ -544,6 +558,16 @@ static const struct gbm_dri_visual gbm_dri_visuals_table[] = {
      { 0x000003ff, 0x000ffc00, 0x3ff00000, 0xc0000000 },
      false,
    },
+   {
+     GBM_FORMAT_XBGR16161616F, __DRI_IMAGE_FORMAT_XBGR16161616F,
+     { 0x000000000000ffff, 0x00000000ffff0000, 0x0000ffff00000000, 0x0000000000000000},
+     true,
+   },
+   {
+     GBM_FORMAT_ABGR16161616F, __DRI_IMAGE_FORMAT_ABGR16161616F,
+     { 0x000000000000ffff, 0x00000000ffff0000, 0x0000ffff00000000, 0xffff000000000000},
+     true,
+   },
 };
 
 static int
diff --git a/src/gbm/main/gbm.c b/src/gbm/main/gbm.c
index 2501518..28e9237 100644
--- a/src/gbm/main/gbm.c
+++ b/src/gbm/main/gbm.c
@@ -271,6 +271,9 @@ gbm_bo_get_bpp(struct gbm_bo *bo)
       case GBM_FORMAT_RGBA1010102:
       case GBM_FORMAT_BGRA1010102:
          return 32;
+      case GBM_FORMAT_XBGR16161616F:
+      case GBM_FORMAT_ABGR16161616F:
+         return 64;
    }
 }
 
diff --git a/src/gbm/main/gbm.h b/src/gbm/main/gbm.h
index 9b52887..4c6ab37 100644
--- a/src/gbm/main/gbm.h
+++ b/src/gbm/main/gbm.h
@@ -150,6 +150,15 @@ enum gbm_bo_format {
 #define GBM_FORMAT_RGBA1010102	__gbm_fourcc_code('R', 'A', '3', '0') /* [31:0] R:G:B:A 10:10:10:2 little endian */
 #define GBM_FORMAT_BGRA1010102	__gbm_fourcc_code('B', 'A', '3', '0') /* [31:0] B:G:R:A 10:10:10:2 little endian */
 
+/*
+ * Floating point 64bpp RGB
+ * IEEE 754-2008 binary16 half-precision float
+ * [15:0] sign:exponent:mantissa 1:5:10
+ */
+#define GBM_FORMAT_XBGR16161616F __gbm_fourcc_code('X', 'B', '4', 'H') /* [63:0] x:B:G:R 16:16:16:16 little endian */
+
+#define GBM_FORMAT_ABGR16161616F __gbm_fourcc_code('A', 'B', '4', 'H') /* [63:0] A:B:G:R 16:16:16:16 little endian */
+
 /* packed YCbCr */
 #define GBM_FORMAT_YUYV		__gbm_fourcc_code('Y', 'U', 'Y', 'V') /* [31:0] Cr0:Y1:Cb0:Y0 8:8:8:8 little endian */
 #define GBM_FORMAT_YVYU		__gbm_fourcc_code('Y', 'V', 'Y', 'U') /* [31:0] Cb0:Y1:Cr0:Y0 8:8:8:8 little endian */
-- 
2.7.4



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