util/format: Add new 10-bit P010 RGB/planar formats

Introduce three 10-bit formats: X6R10_UNORM, X6R10X6G10_UNORM, and X6G10_X6B10X6R10_420_UNORM.
These formats allocate 10 bits for each color channel with 6 bits of padding to align with Vulkan's P010
and related planar formats.

Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Signed-off-by: Valentine Burley <valentine.burley@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30821>

src/util/format/u_format.yaml

@@ -1902,8 +1902,8 @@
   swizzles: [X, 0, 0, 1]
 
 
-# RGB version of NV12 and YV12 for hardware that supports sampling from
-# multiplane textures but needs color-space conversion in the shader.
+# RGB versions of NV12, YV12, and P010 for hardware that supports sampling
+# from multiplane textures but needs color-space conversion in the shader.
 - name: R8_G8B8_420_UNORM
   layout: planar2
   colorspace: RGB
@@ -1946,9 +1946,15 @@
   block: {width: 1, height: 1, depth: 1}
   channels: [UN8]
   swizzles: [X, Y, Z, W]
+- name: X6G10_X6B10X6R10_420_UNORM
+  layout: planar2
+  colorspace: RGB
+  block: {width: 1, height: 1, depth: 1}
+  channels: [X6, UN10]
+  swizzles: [X, Y, Z, W]
 
-# While most of Mesa uses R8 for Y, U, and V planes, freedreno requires distinguishing
-# between tiled Y8 data and tiled R8 data.
+# While most of Mesa uses R8 for Y, U, and V planes, freedreno requires
+# distinguishing between tiled Y8 data and tiled R8 data.
 - name: Y8_UNORM
   layout: other
   colorspace: YUV
@@ -1956,6 +1962,20 @@
   channels: [UN8]
   swizzles: [X, 0, 0, 1]
 
+# Formats for plane 0/plane 1 of P010
+- name: X6R10_UNORM
+  layout: plain
+  colorspace: RGB
+  block: {width: 1, height: 1, depth: 1}
+  channels: [X6, UN10]
+  swizzles: [Y, 0, 0, 1]
+- name: X6R10X6G10_UNORM
+  layout: plain
+  colorspace: RGB
+  block: {width: 1, height: 1, depth: 1}
+  channels: [X6, UN10, X6, UN10]
+  swizzles: [Y, W, 0, 1]
+
 - name: Y8_U8_V8_422_UNORM
   layout: planar3
   colorspace: YUV

src/util/format/u_format_table.py

@@ -105,6 +105,7 @@ def has_access(format):
         'g8r8_g8b8_unorm',
         'g8b8_g8r8_unorm',
         'b8g8_r8g8_unorm',
+        'x6g10_x6b10x6r10_420_unorm',
         'y8_400_unorm',
         'y8_u8_v8_422_unorm',
         'y8_u8v8_422_unorm',

src/util/format/u_formats.h

@@ -237,6 +237,10 @@ enum pipe_format {
 
    PIPE_FORMAT_R8G8_B8G8_UNORM,
    PIPE_FORMAT_G8R8_G8B8_UNORM,
+   PIPE_FORMAT_X6G10_X6B10X6R10_420_UNORM,
+
+   PIPE_FORMAT_X6R10_UNORM,
+   PIPE_FORMAT_X6R10X6G10_UNORM,
 
    /* mixed formats */
    PIPE_FORMAT_R8SG8SB8UX8U_NORM,