dri: Add fp16 formats

Add dri formats for RGBA ordered 64 bpp IEEE 754 half precision floating
point. Leverage existing offscreen render support for
MESA_FORMAT_RGBA_FLOAT16 and MESA_FORMAT_RGBX_FLOAT16.

Signed-off-by: Kevin Strasser <[email protected]>
Reviewed-by: Adam Jackson <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>

2 files changed, 22 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/common/dri_util.c b/src/mesa/drivers/dri/common/dri_util.c
index ac3a04bceff..a384cadd557 100644
--- a/src/mesa/drivers/dri/common/dri_util.c
+++ b/src/mesa/drivers/dri/common/dri_util.c
@@ -887,6 +887,14 @@ static const struct {
       .mesa_format  =        MESA_FORMAT_B8G8R8X8_UNORM,
    },
    {
+      .image_format = __DRI_IMAGE_FORMAT_ABGR16161616F,
+      .mesa_format  =        MESA_FORMAT_RGBA_FLOAT16,
+   },
+   {
+      .image_format = __DRI_IMAGE_FORMAT_XBGR16161616F,
+      .mesa_format  =        MESA_FORMAT_RGBX_FLOAT16,
+   },
+   {
       .image_format = __DRI_IMAGE_FORMAT_ARGB2101010,
       .mesa_format  =        MESA_FORMAT_B10G10R10A2_UNORM,
    },
diff --git a/src/mesa/drivers/dri/common/utils.c b/src/mesa/drivers/dri/common/utils.c
index 86ccfd637be..44e4e0f3720 100644
--- a/src/mesa/drivers/dri/common/utils.c
+++ b/src/mesa/drivers/dri/common/utils.c
@@ -212,6 +212,12 @@ driCreateConfigs(mesa_format format,
       /* MESA_FORMAT_R10G10B10A2_UNORM */
       {{ 0x000003FF, 0x000FFC00, 0x3FF00000, 0xC0000000 },
        { 0, 10, 20, 30 }},
+      /* MESA_FORMAT_RGBX_FLOAT16 */
+      {{ 0, 0, 0, 0},
+       { 0, 16, 32, -1 }},
+      /* MESA_FORMAT_RGBA_FLOAT16 */
+      {{ 0, 0, 0, 0},
+       { 0, 16, 32, 48 }},
    };
 
    const uint32_t * masks;
@@ -260,6 +266,14 @@ driCreateConfigs(mesa_format format,
       masks = format_table[4].masks;
       shifts = format_table[4].shifts;
       break;
+   case MESA_FORMAT_RGBX_FLOAT16:
+      masks = format_table[9].masks;
+      shifts = format_table[9].shifts;
+      break;
+   case MESA_FORMAT_RGBA_FLOAT16:
+      masks = format_table[10].masks;
+      shifts = format_table[10].shifts;
+      break;
    case MESA_FORMAT_R10G10B10X2_UNORM:
       masks = format_table[7].masks;
       shifts = format_table[7].shifts;